Skf spherical plain bearings bearings and rod ends en by ERIKS Nederland

SKF spherical plain bearings and rod ends

® SKF is a registered trademark of the SKF Group. © SKF Group 2011 The contents of this catalogue are the copyright of the publisher and may not be reproduced (even extracts) unless prior written permission is granted. Every care has been taken to ensure the accuracy of the information contained in this catalogue but no liability can be accepted for any loss or damage whether direct, indirect or consequential arising out of the use of the information contained herein. PUB BU/P1 06116/1 EN · September 2011 This publication supersedes publication 4407/II E.

Principles of selection and application . ........................ 25

Radial spherical plain bearings requiring maintenance . . 99

Maintenance-free radial spherical plain bearings ......... 125

Angular contact spherical plain bearings ...................... 151

Thrust spherical plain bearings ................................... 159

Rod ends requiring maintenance ................................. 167

Maintenance-free rod ends ......................................... 189

Other SKF plain bearings and special solutions ............. 207

Product index . ............................................................ 213

Contents

Foreword ................................................................................................................

Unit conversions......................................................................................................

SKF – the knowledge engineering company................................................................

General product information ....................................................................................

1 Principles of selection and application ................................................................... Selection of bearing type ........................................................................................................... Selection of bearing size ............................................................................................................ Friction ........................................................................................................................................ Design of bearing arrangements .............................................................................................. Lubrication ................................................................................................................................. Relubrication .............................................................................................................................. Mounting .................................................................................................................................... Dismounting ...............................................................................................................................

25 27 38 69 70 84 90 92 96

2 Radial spherical plain bearings requiring maintenance . .......................................... Product tables 2.1 Radial spherical plain bearings, steel/steel, metric sizes .............................................. 2.2 Radial spherical plain bearings, steel/steel, inch sizes .................................................. 2.3 Radial spherical plain bearings with an extended inner ring, steel/steel, metric sizes . . 2.4 Radial spherical plain bearings with an extended inner ring, steel/steel, inch sizes . ..

99 104 110 116 120

3 Maintenance-free radial spherical plain bearings ................................................... Product tables 3.1 Maintenance-free radial spherical plain bearings, steel/PTFE sintered bronze, metric sizes ..................................................................................................................... 3.2 Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes...... 3.3 Maintenance-free radial spherical plain bearings, steel/PTFE fabric, inch sizes ........ 3.4 Maintenance-free radial spherical plain bearings, steel/PTFE FRP, metric sizes . ......

125

4 Angular contact spherical plain bearings................................................................. Product tables 4.1 Maintenance-free angular contact spherical plain bearings, steel/PTFE FRP ............

151

5 Thrust spherical plain bearings.............................................................................. Product tables 5.1 Maintenance-free thrust spherical plain bearings, steel/PTFE FRP ............................

159

132 134 140 144

156

164

6 Rod ends requiring maintenance............................................................................ Product tables 6.1 Rod ends with a female thread, steel/steel..................................................................... 6.2 Rod ends with a female thread, for hydraulic cylinders, steel/steel............................... 6.3 Rod ends with a male thread, steel/steel ....................................................................... 6.4 Rod ends with a cylindrical section welding shank, steel/steel ..................................... 6.5 Rod ends with a rectangular section welding shank, steel/steel .................................. 6.6 Rod ends with a female thread, steel/bronze ................................................................ 6.7 Rod ends with a male thread, steel/bronze....................................................................

167 172 174 178 180 182 184 186

7 Maintenance-free rod ends.................................................................................... Product tables 7.1 Maintenance-free rod ends with a female thread, steel/PTFE sintered bronze .......... 7.2 Maintenance-free rod ends with a male thread, steel/PTFE sintered bronze ............. 7.3 Maintenance-free rod ends with a female thread, steel/PTFE fabric .......................... 7.4 Maintenance-free rod ends with a male thread, steel/PTFE fabric ............................. 7.5 Maintenance-free rod ends with a female thread, steel/PTFE FRP ............................. 7.6 Maintenance-free rod ends with a male thread, steel/PTFE FRP ................................

189 194 196 198 200 202 204

8 Other SKF products and services ...........................................................................

207

9 Product index.......................................................................................................

213

The SKF brand now stands for more than ever before, and means more to you as a valued customer. While SKF maintains its leadership as a highquality bearing manufacturer throughout the world, new dimensions in technical advances, product support and services have evolved SKF into a truly solutions-oriented supplier, creating greater value for customers. These solutions enable customers to improve productivity, not only with breakthrough application-specific products, but also through leading-edge design simulation tools and consultancy services, plant asset efficiency maintenance programmes, and the industryâ&#x20AC;&#x2122;s most advanced supply management techniques. The SKF brand still stands for the very best in rolling bearings, but it now stands for much more. SKF â&#x20AC;&#x201C; the knowledge engineering company

Foreword

Many applications require bearings that are suitable for oscillating movements and that can accommodate misalignment. Rolling bearings only partly fulfil these requirements as they are generally designed for continuous rotation and can only accommodate limited misalignment. Therefore, SKF manufactures spherical plain bearings and rod ends to provide an economical solution to these challenges. This catalogue presents the current assortment of SKF spherical plain bearings and rod ends. Structure of the catalogue The catalogue starts with general product information, followed by nine main chapters, which are marked with numbered blue tabs in the right margin: • Chapter 1 provides design and application recommendations. • Chapters 2 to 7 describe the various bearing and rod end types. Each chapter contains descriptions of the products as well as product tables, listing data for selecting a bearing or rod end and designing the bearing arrangement. • Chapter 8 is an overview about other SKF products and services. • In chapter 9, all products presented in this catalogue are listed in alphabetical order by designation. About the data in this catalogue The data in this catalogue relate to SKF’s stateof-the-art technology and production capabil ities as of beginning 2010. The data may differ from that shown in earlier catalogues because of revised methods of calculation, redesign or technological developments. For example, the following new information and product data

have been included for radial spherical plain bearings: • Bearings in the TX series have been added and are available with bore diameters up to 800 mm. • Bearings in the maintenance-free series are fitted with LS seals as standard. • Bearings with the sliding material FSA have been replaced by the FBAS design. • Bearings requiring maintenance are also available with LS seals. • Part of the inch assortment is also available with LS seals. SKF reserves the right to make continuing improvements to SKF products with respect to materials, design and manufacturing methods, as well as changes necessitated by technological developments. The units used in this catalogue are in accordance with ISO (International Organization for Standardization) standard 1000:1992, and SI (Système International d’Unités). Unit conversions are listed in the table on page 7. Other SKF catalogues The total SKF product portfolio is much broader than just spherical plain bearings and rod ends. Product information is also available via the SKF website at www.skf.com. The SKF Interactive Engineering Catalogue provides not only product information, but also online calculation tools, CAD drawings in various formats, and search and selection functions. The main printed SKF catalogues are: • General catalogue • Needle roller bearings • High-precision bearings • Y-bearings and Y-bearing units 5

• Bearing housings • Slewing bearings • Linear motion standard range • SKF Maintenance and Lubrication Products • Centralized lubrication systems • Industrial shaft seals • SKF Power transmission products For additional information about SKF products and services, contact your local SKF represen tative or SKF Authorized Distributor. More advantages SKF aims to deliver industry-leading, high value products, services and knowledge-engineered solutions. Many of the product’s capabilities contribute to the overall value customers receive in making SKF their supplier of choice, such as: • simplified bearing selection • short delivery times • worldwide availability • commitment to product innovation • state-of-the-art application solutions • extensive engineering and technology knowledge in virtually every industry

Unit conversions Quantity

Unit

Conversion

Length

inch foot yard mile

1 mm 1 m 1 m 1 km

0,03937 in 3,281 ft 1,094 yd 0,6214 mile

1 in 1 ft 1 yd 1 mile

25,40 mm 0,3048 m 0,9144 m 1,609 km

Area

square inch square foot

1 mm2 1 m2

0,00155 sq.in 10,76 sq.ft

1 sq.in 1 sq.ft

645,16 mm2 0,0929 m2

Volume

cubic inch 1 cm3 cubic foot 1 m3 imperial gallon 1 l U.S. gallon 1 l

0,061 cub.in 35 cub.ft 0,22 gallon 0,2642 U.S. gallon

1 cub.in 1 cub.ft 1 gallon 1 U.S. gallon

16,387 cm3 0,02832 m3 4,5461 l 3,7854 l

Velocity, speed

foot per second 1 m/s mile per hour 1 km/h

3,28 ft/s 0,6214 mile/h (mph)

1 ft/s 1 mile/h (mph)

0,30480 m/s 1,609 km/h

Mass

ounce pound short ton long ton

1 g 1 kg 1 tonne 1 tonne

0,03527 oz 2,205 lb 1,1023 short ton 0,9842 long ton

1 oz 1 lb 1 short ton 1 long ton

28,350 g 0,45359 kg 0,90719 tonne 1,0161 tonne

Density

pound per cubic inch

1 g/cm3 0,0361 lb/cub.in

1 lb/cub.in

27,680 g/cm3

Force

pound-force

1 N

0,225 lbf

1 lbf

4,4482 N

Pressure, stress

pounds per square inch

1 MPa

145 psi

1 psi

6,8948 ÂĽ 103 Pa

Moment

inch pound-force 1 Nm

8,85 in.lbf

1 in.lbf

0,113 Nm

Power

foot-pound per second horsepower

1 W

0,7376 ft lbf/s

1 ft lbf/s

1,3558 W

1 kW

1,36 HP

1 HP

0,736 kW

Temperature

degree

Celsius

tC = 0,555 (tF â&#x20AC;&#x201C; 32) Fahrenheit tF = 1,8 tC + 32

SKF â&#x20AC;&#x201C; the knowledge engineering company From the company that invented the self-aligning ball bearing more than 100 years ago, SKF has evolved into a knowledge engineering company that is able to draw on five technology platforms to create unique solutions for its customers. These platforms include bearings, bearing units and seals, of course, but extend to other areas including: lubricants and lubrication systems, critical for long bearing life in many applications; mechatronics that combine mechanical and electronics knowledge into systems for more effective linear motion and sensorized solutions; and a full range of services, from design and logistics support to condition monitoring and reliability systems. Though the scope has broadened, SKF continues to maintain the worldâ&#x20AC;&#x2122;s leadership in the design, manufacture and marketing of rolling bearings, as well as complementary products such as radial seals. SKF also holds an increasingly important position in the market for linear motion products, high-precision aerospace bearings, machine tool spindles and plant maintenance services.

Seals

Bearings and units

Mechatronics

The SKF Group is globally certified to ISO 14001, the international standard for environmental management, as well as OHSAS 18001, the health and safety management standard. Individual divisions have been approved for quality certification in accordance with ISO 9001 and other customer specific requirements. With over 100 manufacturing sites worldwide and sales companies in 70 countries, SKF is a truly international corporation. In addition, our 15 000 distributors and dealers around the world, an e-business marketplace, and a global distribution system, put SKF closer to customers to enhance their ability to quickly supply both products and services. In essence, SKF solutions are available wherever and whenever customers need them. Overall, the SKF brand and the corporation are stronger than ever. As the knowledge engineering company, we stand ready to serve you with world-class product competencies, intellectual resources, and the vision to help you succeed.

Lubrication systems

Services

Evolving by-wire technology SKF has a unique expertise in the fast-growing by-wire technology, from fly-by-wire, to drive-by-wire, to work-by-wire. SKF pioneered practical fly-by-wire technology and is a close working partner with all aerospace industry leaders. As an example, virtually all aircraft of the Airbus design use SKF by-wire systems for cockpit flight control.

SKF is also a leader in automotive by-wire technology, and has partnered with automotive engineers to develop two concept cars, which employ SKF mechatronics for steering and braking. Further by-wire development has led SKF to produce an all-electric forklift truck, which uses mechatronics rather than hydraulics for all controls. 9

Harnessing wind power The growing industry of wind-generated electric power provides a source of clean, green electricity. SKF is working closely with global industry leaders to develop efficient and trouble-free turbines, providing a wide range of large, highly specialized bearings and condition monitoring systems to extend equipment life of wind farms located in even the most remote and inhospitable environments.

Working in extreme environments In frigid winters, especially in northern countries, extreme sub-zero temperatures can cause bearings in railway axleboxes to seize due to lubrication starvation. SKF created a new family of synthetic lubricants formulated to retain their lubrication viscosity even at these extreme temperatures. SKF knowledge enables manufacturers and end user customers to overcome the performance issues resulting from extreme temperatures, whether hot or cold. For example, SKF products are at work in diverse environments such as baking ovens and instant freezing in food processing plants

Developing a cleaner cleaner The electric motor and its bearings are the heart of many household appliances. SKF works closely with appliance manufacturers to improve their productsâ&#x20AC;&#x2122; performance, cut costs, reduce weight, and reduce energy consumption. A recent example of this cooperation is a new generation of vacuum cleaners with substantially more suction. SKF knowledge in the area of small bearing technology is also applied to manufacturers of power tools and office equipment.

Maintaining a 350 km/h R&D lab In addition to SKFâ&#x20AC;&#x2122;s renowned research and development facilities in Europe and the United States, Formula One car racing provides a unique environment for SKF to push the limits of bearing technology. For over 60 years, SKF products, engineering and knowledge have helped make Scuderia Ferrari a formidable force in F1 racing. (The average racing Ferrari utilizes around 150 SKF components.) Lessons learned here are applied to the products we provide to automakers and the aftermarket worldwide.

Delivering Asset Efficiency Optimization Through SKF Reliability Systems, SKF provides a comprehensive range of asset efficiency products and services, from condition monitoring hardware and software to maintenance strategies, engineering assistance and machine reliability programmes. To optimize efficiency and boost productivity, some industrial facilities opt for an Integrated Maintenance Solution, in which SKF delivers all services under one fixed-fee, performance-based contract.

Planning for sustainable growth By their very nature, bearings make a positive contribution to the natural environment, enabling machinery to operate more efficiently, consume less power, and require less lubrication. By raising the performance bar for our own products, SKF is enabling a new generation of highefficiency products and equipment. With an eye to the future and the world we will leave to our children, the SKF Group policy on environment, health and safety, as well as the manufacturing techniques, are planned and implemented to help protect and preserve the earthâ&#x20AC;&#x2122;s limited natural resources. We remain committed to sustainable, environmentally responsible growth.

General product information

Properties............................................................................................................... Spherical plain bearings . ........................................................................................................... Rod ends......................................................................................................................................

14 14 15

Bearing designs and features.................................................................................... Bearings and rod ends requiring maintenance.......................................................................... The multi-groove system........................................................................................................ Maintenance-free, long-life sliding contact surfaces................................................................ Optional SKF design features...................................................................................................... A choice of materials . ............................................................................................................. With or without seals............................................................................................................... Wide operating temperature range........................................................................................

16 17 17 18 19 19 19 19

Multi-purpose performance ..................................................................................... Typical applications...................................................................................................................... Application examples................................................................................................................... Suspended roof....................................................................................................................... Road roller articulation joint................................................................................................... Truck twin-axle supports........................................................................................................ Dam gates................................................................................................................................ Hydraulic and pneumatic cylinders......................................................................................... Newspaper conveyor...............................................................................................................

20 20 20 20 21 21 22 22 22

General product information

Properties

Spherical plain bearings Spherical plain bearings are standardized, ready-to-mount, mechanical components that enable multi-directional, self-aligning movements. The inner ring has a spherical convex outside diameter, while the outer ring has a correspondingly concave inside diameter († fig. 1). The forces acting on the bearing may be static or may occur when the bearing makes oscillating or recurrent tilting and slewing movements at relatively low speeds.

Design advantages inherent to spherical plain bearings include the ability to: • accommodate misalignment († fig. 2) • virtually eliminate edge stresses and excessive stressing of adjacent components († fig. 3) • accommodate deformation of surrounding components in operation († fig. 4) • accommodate wide manufacturing tolerances and the use of cost-effective, welded assemblies († fig. 5)

Fig. 2 Spherical plain bearings are designed to accommodate misalignment

Fig. 1 Spherical plain bearing

Fig. 3 Compared to bushings, spherical plain bearings provide higher reliability, as the chance of edge stresses and overloading are virtually non-existent

Rod ends Spherical plain bearing rod ends are bearing units that consist of a spherical plain bearing in the eye-shaped head of the rod end housing (â&#x20AC; fig. 6). They are used primarily on the ends of hydraulic or pneumatic pistons to join the cylinder to an associated component via an internal (female) thread, external (male) thread or a welding shank (â&#x20AC; fig. 7 on page 16). SKF supplies rod ends with a threaded shank with a right-hand thread as standard. With the exception of rod ends with the designation suffix VZ019, all rod ends are also available with a left-hand thread. They are identified by the designation prefix L.

Fig. 4 Shaft deflection does not have a negative influence on bearing service life, the shaft or housing

Fig. 5 Spherical plain bearings can accommodate the wide manufacturing tolerances found in cost-effective welded assemblies

Fig. 6 Rod end with a male thread

General product information

Bearing designs and features

SKF spherical plain bearings and rod ends are an excellent choice for applications that require total design economy. These state-of-the-art products are available in a wide assortment of designs, dimension series and sizes to meet the needs of a particular application. Fig. 7 shows the general bearing and rod end types. Whether the application calls for a large spherical plain bearing or a small rod end assembly, both are available from SKF and offer:

worldwide, making them readily accessible whenever and wherever they are needed. Economic considerations and unparalleled design characteristics are not the only reasons that SKF spherical plain bearings and rod ends are the ultimate solution for any plain bearing application. Their designs, materials and manufacturing quality enable long service life and high reliability even in the most demanding applications.

â&#x20AC;˘ long service life â&#x20AC;˘ minimal maintenance â&#x20AC;˘ high operational reliability SKF spherical plain bearings and rod ends, produced with standard dimensions, are available Fig. 7

Radial spherical plain bearing

Angular contact spherical plain bearing

Thrust spherical plain bearing

Rod end with a female thread

Rod end with a male thread

Rod end with a welding shank

Bearings and rod ends requiring maintenance Bearings and rod ends requiring maintenance must be greased prior to being put into oper ation. With the exception of a few applications, they must be relubricated periodically. SKF steel/steel radial spherical plain bearings are made of bearing steel and are through-hardened. The high-strength sliding contact surfaces are phosphated and treated with a special running-in lubricant. These bearings are used primarily in applications where there are: • heavy static loads • heavy alternating loads • shock loads They are also relatively insensitive to contamin ants and high temperatures. To facilitate relubrication, lubrication holes and grooves are provided in both the inner and outer rings of all steel/steel radial spherical plain bearings – with the exception of a few small sizes. SKF steel/bronze rod ends also require relubrication. However, requirements are less stringent than for steel/steel rod ends, as the emergency running properties of bronze are more forgiving than steel.

The multi-groove system Standard steel/steel radial spherical plain bearings that must accommodate minor alignment movements under very heavy, constant direction loads are prone to lubricant starvation. To maximize the effects of the lubricant under these conditions, SKF has developed the multi-groove system and manufactures all metric steel/steel radial spherical plain bearings with an outside diameter D ≥ 150 mm with the multi-groove system on the sliding surface of the outer ring as standard († fig. 8). Metric steel/steel radial spherical plain bearings with an outside diameter D < 150 mm can be supplied with the multi-groove system on request. These bearings are identified by the designation suffix ESL. These lubrication grooves provide the following benefits: • improved lubricant supply to the loaded zone • enlarged lubricant reservoir in the bearing • enable relubrication under load • extended relubrication intervals • space for wear particles and contaminants • extended grease life The main benefit of the multi-groove system is that it improves lubricant distribution in the heavily loaded zone to extend service life and/or maintenance intervals.

Fig. 8 Steel/steel radial spherical plain bearing with the multigroove system

General product information

Maintenance-free, long-life sliding contact surfaces “Maintenance-free” is an industry-wide term used to describe plain bearings and rod ends with self-lubricating sliding contact surface combinations. The term maintenance-free does not imply that these bearings should not be inspected as part of a regularly scheduled maintenance program. These so-called maintenance-free bearings and rod ends offer a number of advantages for OEMs and end users alike. These advantages, which include minimal maintenance and reduced lubricant consumption, quickly compensate for the difference in the initial purchase price when compared to standard steel/steel bearing solutions. And of course, the impact that maintenance-free bearings have on the envir onment is an added benefit. To offer maintenance-free solutions for the greatest number of applications, SKF produces spherical plain bearings and rod ends with different sliding contact surface combinations († fig 9). These combinations, which in some cases are size dependent, include: • steel/PTFE (polytetrafluoroethylene) sintered bronze • steel/PTFE fabric • steel/PTFE FRP (fibre reinforced polymer) Maintenance-free bearings can operate without grease, and therefore do not need to be relubricated. Depending on the sliding surfaces, grease

can improve bearing service life or can have a negative effect on it. Therefore, SKF does not recommend the use of lubricants for bearings with steel/PTFE sintered bronze or steel/PTFE fabric sliding contact surface combinations, whereas initial lubrication followed by occasional relubrication of steel/PTFE FRP bearings can extend the service life of the bearing. Be aware that “maintenance-free” refers to bearing service life only, and does not refer to the service life of an application or general maintenance intervals of other machine parts in the application. For detailed information about the life of spherical plain bearings or rod ends, refer to the section Basic rating life starting on page 39. The basic rating life as a guideline value for the service life under certain operating conditions can be calculated using the information provided in the section Basic rating life calculation starting on page 51. Self-lubricating, dry sliding materials are not as stiff as steel and consequently are subject to greater deformation under load than steel. These sliding materials are also more sensitive than steel to alternating or shock loads. If either of these load conditions exists, contact the SKF application engineering service. Maintenance-free bearings and rod ends are designed for applications where: • load direction is constant and may be heavy • low coefficient of friction is necessary • relubrication is not possible or difficult

Fig. 9 Maintenance-free, long life sliding contact surfaces

steel/PTFE sintered bronze

steel/PTFE fabric

steel/PTFE FRP

Optional SKF design features A choice of materials For most applications, SKF spherical plain bearings made of standard bearing steel requiring maintenance are an excellent choice. However, for difficult operating environments, SKF maintenance-free stainless steel spherical plain bearings may be preferred. For other material options, e.g. surface treatments, contact the SKF application engineering service. With or without seals Most popular sizes of SKF spherical plain bearings are available either open (without seals) or sealed on both sides († fig. 10). Standard sealed bearings can increase the service life of a bearing and save space, while reducing inventory and assembly costs. Maintenance-free bearings without seals have to be protected against contaminants. Spherical plain bearings fitted on both sides with the SKF RS double lip seal are very effect ive, under normal operating conditions, at keeping contaminants away from the sliding contact surfaces. These seals also effectively retain the grease and therefore are appropriate for bearings requiring maintenance.

Maintenance-free bearings and all bearings operating in highly contaminated environments should be fitted with the SKF LS triple-lip heavy-duty contact seal († page 79). They are reinforced with a steel insert and have three seal lips. These very effective seals protect the bearing against contaminants and enhance the operational reliability of the spherical plain bearing. Wide operating temperature range SKF spherical plain bearings and rod ends can operate effectively over a wide temperature range. The operating temperature range of open (without seals) steel/steel radial spherical plain bearings is –50 to +200 °C.

Fig. 10 Many sealing problems can be solved economically and in a space-saving manner using sealed bearings

without seal (open design)

double-lip seal (RS design)

triple-lip heavy-duty seal (LS design)

General product information

Multi-purpose performance

Typical applications

Application examples

Long service life, high reliability and minimal maintenance are some of the features of SKF spherical plain bearings and rod ends. SKF’s wide assortment of spherical plain bearings and rod ends is versatile enough to be used in a variety of applications that encompass almost all sectors of industry, including:

Suspended roof SKF steel/steel radial spherical plain bearings are in service in an unusual and world-renowned application, the roof of the Olympic Stadium in Munich, Germany († fig. 11). The roof is constructed of a number of pre-stressed steel cables in a network. The nodal points of the network must be torque-free. That is where 225 standard SKF steel/steel radial spherical plain bearings with bore diameters ranging from 160 to 300 mm are located. The nodes are statically loaded but must enable occasional swinging movements of the roof construction. Although SKF steel/steel radial spherical plain bearings are typically not maintenance-free, these particular bearings have not been relubricated since the construction of the building in 1972. What better proof could there be for lasting quality and reliability?

• agriculture • construction • forklift trucks • material handling • metals • mining • railways • trucks • wind energy

Fig. 11 Nodal points of suspended roof construction of the Olympic Stadium in Munich, Germany

Road roller articulation joint SKF spherical plain bearings in the articulation joint between the front and rear rollers (â&#x20AC; fig. 12) enable a road roller to manoeuvre. This joint must be able to withstand very heavy radial loads and high vibration levels. Due to their location, the bearings should be protected as they are exposed to a variety of contaminants including dust, dirt, water and hot tarmac, which promote premature wear and corrosion. SKF maintenance-free spherical plain bearings help to eliminate the need for relubrication, and reduce the total cost of ownership. Truck twin-axle supports An SKF spherical plain bearing arrangement on the truck twin-axle support provides even load

distribution between the two axles for trucks driving on rough roads or off-highway conditions (â&#x20AC; fig. 13). This bearing arrangement is subjected to heavy loads and, depending on the conditions, heavy shock loads, and frequent alignment movements. These bearings are located behind the tires in an area that is very difficult to access, making it imperative that sudden bearing damage or failure, requiring immediate roadside repairs, be avoided at all cost. A pair of SKF angular contact spherical plain bearings mounted in a backto-back arrangement can help prevent these emergencies. These bearings, which can withstand all the rigours of truck duty, are simple to install and easy to maintain. Fig. 12

Road roller articulation joint

Fig. 13 Truck twin-axle supports

General product information Dam gates Segment gates for dams and other barrages are home to large-size SKF maintenance-free spherical plain bearings († fig. 14). The reference list is very long – with over 3 000 applications to date. As main bearings, they compensate for shaft misalignment, caused by thermal expansion and contraction, elastic deformation of the dam gates as well as changes caused by settling of the foundation. These bearings cope with the heavy radial loads caused by water pressure as well as axial loads that arise from the inclined position of the support arms. In addition, SKF spherical plain bearings not only serve as heavily loaded bearings under static conditions, they also operate in the frequently used linkage attachments of the lifting and plunger cylinders as well as the flaps. Hydraulic and pneumatic cylinders SKF steel/steel and steel/bronze rod ends are frequently used on hydraulic and pneumatic cylinders († fig. 15). Acting as the link between the cylinder and its attachments, they are able to transmit heavy mechanical loads. Hydraulic cylinders (e.g. to ISO 8132) are often fitted with steel/steel rod ends with a female thread that can be secured (compres sible) on one end and a steel/steel rod end with a welding shank on the other. These types of hydraulic cylinders can be found in all types of construction equipment, agricultural machinery, lifting equipment and shutters, recycling depot presses as well as other heavily loaded manoeuvring equipment. In pneumatic cylinders where working pressures regularly reach 1 MPa, steel/bronze rod ends and maintenance-free rod ends are typic ally used at the end of the piston rod. At the opposite end, SKF rod ends with a welding shank are used.

Newspaper conveyor Speed and flexibility are all-important when producing newspapers, not only in the printing process, but also in distribution. The conveyor system from the printing press to the loading dock is a very important component if the newspapers are to be delivered on time. The endless conveyor chain is one such system. It consists of a multitude of links, which together provide the speed and flexibility required. Fig. 16 shows an application where more than 1 000 SKF maintenance-free spherical plain bearings with the sliding contact surface combination steel/PTFE sintered bronze are used. The bearings have been in daily service without maintenance for many years.

Fig. 14 Dam gates

Fig. 15 Hydraulic and pneumatic cylinders

Fig. 16 Newspaper conveyor

Principles for selection and application

Selection of bearing type.......................................................................................... Bearing terminology................................................................................................................... Bearing types............................................................................................................................... Radial spherical plain bearings requiring maintenance......................................................... Maintenance-free radial spherical plain bearings................................................................. Angular contact spherical plain bearings............................................................................... Thrust spherical plain bearings.............................................................................................. Rod ends with a threaded shank, requiring maintenance..................................................... Rod ends with a welding shank, requiring maintenance....................................................... Maintenance-free rod ends with a threaded shank...............................................................

25 27 28 28 30 33 34 34 36 37

Selection of bearing size........................................................................................... Load ratings ................................................................................................................................ Basic dynamic load rating....................................................................................................... Basic static load rating............................................................................................................ Basic rating life ........................................................................................................................... Load............................................................................................................................................. Equivalent dynamic bearing load............................................................................................ Equivalent static bearing load................................................................................................. Permissible loads for rod ends................................................................................................ Requisite bearing size.................................................................................................................. Specific bearing load............................................................................................................... Mean sliding velocity................................................................................................................ Basic rating life calculation......................................................................................................... Steel/steel and steel/bronze sliding contact surface combinations, requiring maintenance............................................................................................................ Maintenance-free steel/PTFE sintered bronze sliding contact surface combination.......... Maintenance-free steel/PTFE fabric sliding contact surface combination........................... Maintenance-free steel/PTFE FRP sliding contact surface combination............................. Variable load and sliding velocity............................................................................................ Calculation examples...................................................................................................................

38 38 38 38 39 41 41 43 44 45 46 46 51

Friction...................................................................................................................

Design of bearing arrangements............................................................................... Radial location of bearings.......................................................................................................... Axial location of bearings............................................................................................................ Located bearings..................................................................................................................... Non-located bearings.............................................................................................................. Abutment and fillet dimensions..............................................................................................

70 70 75 75 75 77

51 54 56 59 61 62

Location of rod ends.................................................................................................................... Sealing......................................................................................................................................... Designing a bearing arrangement for easy mounting and dismounting..................................

78 79 82

Lubrication.............................................................................................................. The SKF traffic light concept....................................................................................................... Spherical plain bearings requiring maintenance....................................................................... Maintenance-free spherical plain bearings............................................................................... Steel/PTFE sintered bronze and steel/PTFE fabric sliding contact surface combinations... Steel/PTFE FRP sliding contact surface combination............................................................ Rod ends requiring maintenance................................................................................................ Maintenance-free rod ends........................................................................................................

84 84 86 88 88 88 89 89

Relubrication...........................................................................................................

Mounting................................................................................................................. Spherical plain bearings.............................................................................................................. Mechanical mounting.............................................................................................................. Hot mounting........................................................................................................................... Rod ends......................................................................................................................................

92 92 92 94 95

Dismounting............................................................................................................ Spherical plain bearings.............................................................................................................. Rod ends......................................................................................................................................

96 96 96

Selection of bearing type

Bearing terminology

Fig. 1

To better understand frequently used plain bearing and rod end specific terms, definitions are provided in fig. 1 and fig. 2.

1 2 3 4 5 6

Spherical plain bearing 1 Outer ring 2 Sliding contact surfaces 3 Seal 4 Inner ring 5 Lubrication hole 6 Lubrication groove

Rod end 1 Spherical plain bearing 2 Rod end 2a Rod end housing 2b Rod end shank, with an external (male) thread. Shanks are also available with an internal (female) thread or with a welding shank. 3 Grease fitting

Fig. 2

2a 3

Selection of bearing types

Bearing types All the products listed below belong to the SKF standard assortment: • radial spherical plain bearings requiring maintenance • maintenance-free radial spherical plain bearings • angular contact spherical plain bearings • thrust spherical plain bearings • steel/steel and steel/bronze rod ends requiring maintenance • maintenance-free rod ends

If the standard assortment does not meet the requirements of an application, SKF can produce special bearings or rod ends, provided quantities are sufficient to enable manufac turing economy.

Radial spherical plain bearings requiring maintenance See chapter 2 starting on page 99 Bearing design Radial spherical plain bearings requiring maintenance

Designation/ bore diameter range

Characteristics

GE .. E d = 4 – 12 mm

Open (without seals), can only be relubricated from the side

GE .. ES d = 15 – 200 mm

Open (without seals), can be relubricated via lubrication holes and an annular groove in both rings

Sliding contact surface combination: Steel/steel Suitable for heavy static or alternating loads, shock loads

GEZ .. ES d = 0.5 – 6 in

GE .. ES-2RS d = 15 – 300 mm GEZ .. ES-2RS d = 0.75 – 6 in

With a double-lip seal on both sides, can be relubricated via lubrication holes and an annular groove in both rings

Bearing design Radial spherical plain bearings requiring maintenance

Designation/ bore diameter range

Characteristics

GE .. ES-2LS d = 20 – 300 mm

With a triple-lip heavy-duty seal on both sides, can be relubricated via lubrication holes and an annular groove in both rings

Sliding contact surface combination: Steel/steel Suitable for heavy static or alternating loads, shock loads

GEZ .. ES-2LS d = 1 – 6 in

GEH .. ES upon request GEZH ..ES d = 1.25 – 5.5 in

GEH .. ES-2RS d = 20 – 120 mm GEZH ..ES-2RS d = 1.25 – 5.5 in

GEH .. ES-2LS d = 20 – 120 mm GEZH .. ES-2LS d = 1.25 – 5.5 in

GEM .. ES upon request GEZM .. ES d = 0.5 – 6 in

Open (not sealed); wider inner ring and larger outside diameter compared to GE .. ES and GEZ .. ES series, to enable higher load ratings and larger tilt angle; can be relubricated via lubrication holes and an annular groove in both rings

With a double-lip seal on both sides; wider inner ring and larger outside diameter compared to GE .. ES-2RS and GEZ .. ES-2RS series, to enable higher load ratings and larger tilt angle; can be relubricated via lubrication holes and an annular groove in both rings

With a triple-lip heavy-duty seal on both sides; wider inner ring and larger outside diameter compared to GE .. ES-2RS and GEZ .. ES-2RS series, to enable higher load ratings and larger tilt angle; can be relubricated via lubrication holes and an annular groove in both rings

Open (without seals); with an extended inner ring on both sides; can be relubricated via lubrication holes and an annular groove in both rings. For bearing arrangements where a spacer sleeve is normally incorporated on both sides of the inner ring.

GEG .. ES d = 16 – 200 mm

GEG series : The inner ring width equals the bore diameter

GEG 12 ESA d = 12 mm

Can only be relubricated via the outer ring

Selection of bearing types

Bearing design Radial spherical plain bearings requiring maintenance

Designation/ bore diameter range

Characteristics

GEM .. ES-2RS d = 20 – 80 mm

With a double-lip seal and an extended inner ring on both sides, can be relubricated via lubrication holes and an annular groove in both rings

Sliding contact surface combination: Steel/steel Suitable for heavy static or alternating loads, shock loads

GEZM .. ES-2RS d = 0.75 – 6 in

GEM .. ES-2LS d = 20 – 80 mm GEZM .. ES-2LS d = 1 – 6 in

With a triple-lip heavy-duty seal and an extended inner ring on both sides, can be relubricated via lubrication holes and an annular groove in both rings

Maintenance-free radial spherical plain bearings See chapter 3 starting on page 125 Bearing design Maintenance-free radial spherical plain bearings

Designation/ bore diameter range

Characteristics

Sliding contact surface combination: Steel/PTFE sintered bronze Suitable for heavy, constant direction loads, where low friction is required; limited suitability for alternating loads, shock loads. GE .. C d = 4 – 30 mm GE .. CJ2 d = 35 – 60 mm

GEH .. C d = 10 – 25 mm

Open (without seals), self-lubricating sliding surfaces have to be externally protected from contaminants

Open (without seals), self-lubricating sliding surfaces have to be externally protected from contaminants; wider inner ring and larger outside diameter compared to GE .. C series, to enable higher load ratings and larger tilt angle

Bearing design Maintenance-free radial spherical plain bearings

Designation/ bore diameter range

Characteristics

Sliding contact surface combination: Steel/PTFE fabric Suitable for very heavy, constant direction loads, where low friction is required; limited suitability for alternating loads, shock loads GE .. TXE-2LS d = 20 – 90 mm GEZ .. TXE-2LS d = 1 – 3.75 in

High performance bearing with a triple-lip heavy-duty seal on both sides, outer ring fractured at one point, self-lubricating sliding surfaces

GE .. TXG3E-2LS d = 20 – 60 mm

GE .. TXG3E-2LS series in stainless steel execution for use in corrosive environments

GE .. TXA-2LS d = 100 – 300 mm

High performance bearing with a triple-lip heavy-duty seal on both sides, axially split outer ring that is held together by one band, self-lubricating sliding surfaces

GEZ .. TXA-2LS d = 4 – 6 in GE .. TXG3A-2LS d = 70 – 200 mm

GE .. TXG3A-2LS series with rings made of stainless steel for use in corrosive environments

GE .. TXGR d = 12 – 17 mm

Open (without seals), stainless steel exe cution for use in corrosive environments, self-lubricating sliding surfaces have to be externally protected from contaminants

GEC .. TXA-2RS d = 320 – 400 mm

High performance bearing with a double-lip seal on both sides, self-lubricating sliding surfaces, axially split outer ring that is held together by two bands

GEC .. TXA-2RS d = 420 – 800 mm

High performance bearing with a double-lip seal on both sides, self-lubricating sliding surfaces, axially split outer ring that is bolted together

Selection of bearing types

Bearing design Maintenance-free radial spherical plain bearings

Designation/ bore diameter range

Characteristics

High performance bearing with a triple-lip heavy-duty seal on both sides; self-lubricating sliding surfaces, wider inner ring and larger outside diameter compared to GE .. TXE-2LS series, to enable higher load ratings and larger tilt angle

GEH ..TXG3E-2LS d = 20 – 50 mm

GEH .. TXG3E-2LS series with rings made of stainless steel for use in corrosive environments

GEH ..TXA-2LS d = 90 – 120 mm

High performance bearing with a triple-lip heavy-duty seal on both sides, self-lubricating sliding surfaces, wider inner ring and larger outside diameter compared to GE .. TXE-2LS series, to enable higher load ratings and larger tilt angle; axially split outer ring that is held together by one band

GEH ..TXG3A-2LS d = 60 – 120 mm

GEH .. TXG3A-2LS series with rings made of stainless steel for use in corrosive environments

Sliding contact surface combination: Steel/PTFE FRP Suitable for heavy, constant direction loads, where low friction is required; limited suitability for alternating loads, shock loads; relatively insensitive to contaminants GEC .. FBAS d = 320 – 1 000 mm

Open (without seals); axially split outer ring that is bolted together; self-lubricating capability; factory greased; lubrication holes and an annular groove in both rings; does not require relubrication, however, relubrication can extend bearing service life

GEP .. FS d = 100 – 1 000 mm

Open (without seals); radially split outer ring that is separable to facilitate mounting; selflubricating capability; factory greased; lubrication holes and an annular groove in both rings; does not require relubrication, however, relubrication can extend bearing service life Compared to GEC .. FBAS series, these bearings are wider and have a larger outside diameter for a given shaft size, resulting in a higher basic load rating. However, they have a smaller tilt angle.

Angular contact spherical plain bearings See chapter 4 starting on page 151 Bearing design Angular contact spherical plain bearings

1 Designation/ bore diameter range

Characteristics

Sliding contact surface combination: Steel/PTFE FRP Suitable for single direction axial loads or combined axial and radial loads, low coefficient of friction, relatively insensitive to contaminants GAC .. F d = 25 â&#x20AC;&#x201C; 120 mm

Open (without seals); self-lubricating capability; factory greased; does not require relubrication, however, relubrication can extend bearing service life

Sliding contact surface combination: Steel/PTFE fabric Suitable for single direction axial loads or combined axial and radial loads, very high load carrying capacity and low coefficient of friction GACD .. TX upon request

Open (without seals), high performance bearing with self-lubricating sliding surface

Sliding contact surface combination: Steel/steel Suitable for heavy single direction axial loads or heavy combined axial and radial loads, heavy alternating loads GACD .. SA upon request GAZ .. SA upon request

Open (without seals), multi-groove system, can be relubricated via lubrication holes and an annular groove in the outer ring

Sliding contact surface combination: Steel/steel Double direction angular contact bearing with a standard inner ring, bearing can be used instead of two angular contact bearings in a face-to-face arrangement, suitable for heavy combined radial and axial loads, heavy alternating loads GEZP(R) .. S upon request

Open (without seals), multi-groove system, can be relubricated via lubrication holes and an annular groove in the inner ring and the two outer rings

Selection of bearing types

Thrust spherical plain bearings See chapter 5 starting on page 159 Bearing design Thrust spherical plain bearings

Designation/ bore diameter range

Characteristics

Open (without seals); self-lubricating capability; factory greased; does not require relubrication, however, relubrication can extend bearing service life

Sliding contact surface combination: Steel/PTFE fabric Suitable for heavy single direction axial loads or combined axial and radial loads, very high load carrying capacity and low coefficient of friction GXD .. TX upon request

Open (without seals), high performance bearing with self-lubricating sliding surface

Sliding contact surface combination: Steel/steel Suitable for heavy single direction axial loads or combined axial and radial loads, heavy alternating loads GXD .. SA upon request

Open (without seals), multi-groove system, can be relubricated via lubrication holes and an annular groove in the housing washer

Rod ends with a threaded shank, requiring maintenance See chapter 6 starting on page 167 Bearing design Rod ends with a threaded shank, requiring maintenance

Designation/ bore diameter range

Characteristics

SI(L) .. E d = 6 – 12 mm

With an open bearing (without seals), no relubrication facilities, available with a right-hand or left-hand thread (designation prefix L)

Sliding contact surface combination: Steel/steel Suitable for heavy static or alternating loads, shock loads

SA(L) .. E d = 6 – 12 mm

SI series

SA series

Bearing design Rod ends with a threaded shank, requiring maintenance

Designation/ bore diameter range

Characteristics

SI(L) .. ES d = 15 – 30 mm

With an open bearing (without seals), can be lubricated via the relubrication facility in the rod end housing and via the pin (shaft), available with a right-hand or left-hand thread

Sliding contact surface combination: Steel/steel Suitable for heavy static or alternating loads, shock loads

SA(L) .. ES d = 15 – 30 mm

SI series

SA series

SA(L) .. ES-2RS d = 35 – 80 mm

With a double-lip seal on both sides of the bearing, can be lubricated via the relubrication facility in the rod end housing and via the pin (shaft), available with a right-hand or left-hand thread

SI(L)A .. ES-2RS d = 40 – 80 mm

SIA and SAA series with different fitting dimensions (thread, height of the housing)

SI(L) .. ES-2RS d = 35 – 80 mm

SI(A) series

SA(A) series

SA(L)A .. ES-2RS d = 40 – 80 mm

Sliding contact surface combination: Steel/steel Suitable for hydraulic cylinders, the slotted shank enables the rod end to be secured by tightening bolts SI(L)J .. ES d = 16 – 100 mm

With an open bearing (without seals), available with a right-hand or left-hand thread Sizes 16 and larger can be lubricated via the relubrication facility in the rod end housing and via the pin (shaft)

SI(L)J 12 E d = 12 mm

No relubrication facilities

SI(L)R .. ES d = 25 – 120 mm

With an open bearing (without seals), compact design, shorter female thread, can be lubricated via the relubrication facility in the rod end housing and via the pin (shaft), available with a right-hand or left-hand thread

SI(L)QG .. ES d = 16 – 200 mm

With an open bearing (without seals), with an inner ring extended on both sides, can be lubricated via the relubrication facility in the rod end housing and via the pin (shaft), available with a right-hand or left-hand thread

SI(L)QG 12 ESA d = 12 mm

Can only be relubricated via the relubrication facilities in the rod end housing

Selection of bearing types

Bearing design Rod ends with a threaded shank, requiring maintenance

Designation/ bore diameter range

Characteristics

Sliding contact surface combination: Steel/bronze Lower load carrying capacity compared to steel/steel rod ends, but more suitable for applications where lubricant starvation might occur

SIKAC .. M

SI(L)KAC .. M d = 5 – 30 mm

With an open bearing (without seals), available with a right-hand or left-hand thread

SA(L)KAC .. M d = 5 – 30 mm

Sizes 6 and larger can be lubricated via the relubrication facility in the rod end shank or housing

SAKAC .. M

Rod ends with a welding shank, requiring maintenance See chapter 6 starting on page 167 Bearing design Rod ends with a welding shank, requiring maintenance

Designation/ bore diameter range

Characteristics

SC ..ES d = 20 – 80 mm

With an open bearing (without seals), can be lubricated via a the relubrication facility in the rod end housing and via the pin (shaft)

Sliding contact surface combination: Steel/steel Suitable for heavy static or alternating loads, shock loads

Primarily used for welding to piston rods and the bases of hydraulic cylinders Centred by a dowel pin

SCF ..ES d = 20 – 120 mm

With an open bearing (without seals); can be lubricated via the the relubrication facility in the rod end housing and via the pin (shaft); high capacity design rod end compared to SC .. ES series, to enable heavier static loads Rectangular welding shank without a dowel pin

Maintenance-free rod ends with a threaded shank See chapter 7 starting on page 189 Bearing design Maintenance-free rod ends with a threaded shank

1 Designation/ bore diameter range

Characteristics

Sliding contact surface combination: Steel/PTFE sintered bronze Suitable for heavy, constant direction loads, where low coefficient of friction is required; limited suitability for alternating loads, shock loads SI(L) .. C d = 6 – 30 mm SA(L) .. C d = 6 – 30 mm

SI .. C

With an open bearing (without seals), available with a right-hand or left-hand thread

SA .. C

Sliding contact surface combination: Steel/PTFE fabric Suitable for very heavy, constant direction loads, where low coefficient of friction is required; limited suitability for alternating loads, shock loads SI(L) .. TXE-2LS d = 35 – 80 mm SA(L) .. TXE-2LS d = 35 – 80 mm SI(L)A .. TXE-2LS d = 40 – 60 mm

With a high performance bearing with a triple-lip heavy-duty seal on both sides of the bearing, available with a right-hand or lefthand thread SIA and SAA series with different fitting dimensions (thread, height of the housing)

SA(L)A .. TXE-2LS d = 40 – 60 mm

SI(A) .. TXE-2LS

SA(A) .. TXE-2LS

Sliding contact surface combination: Steel/PTFE FRP Suitable for heavy, constant direction loads, where low coefficient of friction is required; limited suitability for alternating loads, shock loads SI(L)KB .. F d = 5 – 22 mm SA(L)KB .. F d = 5 – 22 mm

SIKB .. F

With an open bearing (without seals), but relatively insensitive to contaminants, available with a right-hand or left-hand thread

SAKB .. F

Selection of bearing size

Load ratings There is no standardized method for determining the load ratings of spherical plain bearings and rod ends, nor is there any standardized definition. As different manufacturers define load ratings differently, it is not possible to compare the load ratings of bearings produced by one manufacturer with those of another.

Fig. 1 Dynamic bearing load

Basic dynamic load rating The basic dynamic load rating C is used, together with other influencing factors, to determine the basic rating life of spherical plain bearings and rod ends. As a rule, it represents the maximum load that a spherical plain bearing or rod end can accommodate at room temperature when there is movement between the sliding contact surfaces (â&#x20AC; fig. 1). The maximum load in any application should always be considered in relation to the required rating life. The basic dynamic load ratings quoted in the product tables are based on the specific load factor K (â&#x20AC; table 4 on page 45) and the effective projected sliding surface.

Basic static load rating The basic static load rating C0 represents the maximum permissible load that a spherical plain bearing or rod end can accommodate when there is no relative movement between the sliding contact surfaces (â&#x20AC; fig. 2). For spherical plain bearings, the basic static load rating represents the maximum load that the bearing can accommodate at room temperature without inadmissible deforming, fracturing or damaging the sliding contact surfaces. The basic static load ratings quoted for SKF spherical plain bearings are based on a specific 38

Fig. 2 Static bearing load

static load factor K0 († table 4 on page 45) and the effective projected sliding surface. It is assumed that the bearing is adequately supported. To fully exploit the static load rating of a spherical plain bearing, it is generally necessary to use shafts and housings made of highstrength materials. The basic static load rating must also be considered when bearings are dynamically loaded and subjected to additional heavy shock loads. The total load in these cases must not exceed the basic static load rating. For rod ends, it is the strength of the housing at room temperature, under a constant load acting in the direction of the shank axis, that is the determining factor. The basic static load rating represents a safety factor of at least 1,2 relative to the yield strength of the material of the rod end housing, under the above conditions.

Fig. 3 Angle of oscillation

b 3

0 2 4 j

j = angle of oscillation = 2 b A complete oscillation is from point 0 to point 4 and = 4 b

Basic rating life For spherical plain bearings, a lubricant film that fully separates the sliding contact surfaces cannot be formed. Therefore, the sliding contact surfaces make direct contact with each other, resulting in a certain and unavoidable degree of wear. This increases the internal clearance in the bearing. Regarding the life of spherical plain bearings or rod ends, a distinction is made between the basic rating life and the service life. The basic rating life is a theoretical guideline value, used to estimate the service life. Service life depends on the actual operating conditions and is the actual life achieved by the bearing in service. The basic rating life is based on a large number of laboratory tests. The bearings were tested for an operating period until a specific increase in bearing clearance or friction occurred († table 1 on page 40). The basic rating life considers several influencing factors and can be expressed in operating hours or the number of oscillating movements († fig. 3). In some cases, however, it is not possible to quantify factors such as contamination, corrosion, and complex kinematic loads. Therefore, the basic rating life can be attained or exceeded by

the majority of many apparently identical spherical plain bearings under the same operating conditions. For the calculation methods of the different sliding contact surface combinations as well as calculation examples, refer to the section Basic rating life calculation starting on page 51. The service life cannot be calculated as it is too complex to determine and evaluate all the influencing factors. Therefore, depending on the application conditions, the service life may differ from the basic rating life. NOTE: By using the SKF Interactive Engineering Catalogue and its incorporated calculation programs, it is possible to perform the necessary calculations to select a spherical plain bearing with the click of a mouse. The product data necessary for the calculations is automatically put in by selecting a spherical plain bearing or rod end from the product tables. It is then only necessary to fill in the fields for the operating data. The SKF Interactive Engineering Catalogue is available online at www.skf.com.

Selection of bearing size Table 1 Failure criteria for basic rating life tests Sliding contact surface combination

Increase in bearing clearance

Coefficient of friction µ

–

Steel/steel

> 0,004 dk1)

0,20

Steel/bronze

> 0,004 dk1)

0,25

Steel/PTFE2) sintered bronze constant direction load alternating direction load

0,2 0,4

0,25 0,25

Steel/PTFE fabric constant direction load alternating direction load

0,3 0,6

0,15 0,15

Steel/PTFE FRP3)

design and size dependent

0,20

1) d = sphere diameter of the inner ring. k 2) Polytetrafluoroethylene. 3) Fibre reinforced polymer.

Fig. 4 Radial load

Fig. 5 Axial load

Fig. 6 Combined load

Load 1

When considering load, a distinction is made between:

Fig. 7 Constant direction load

• load direction – radial load († fig. 4) – axial load († fig. 5) – combined (axial and radial) load († fig. 6) • type of load – dynamic load, i.e. there is relative sliding movement in the loaded bearing – static load, i.e. there is no relative movement in the loaded bearing • load conditions – constant load († fig. 7), i.e. the direction in which the load is applied does not change and the same part of the bearing (loaded zone) is always subjected to the load – alternating load († fig. 8), i.e. change of load direction so that zones at opposite positions in the bearing are alternately loaded and unloaded

Equivalent dynamic bearing load The load can be inserted directly into the equation for the specific bearing load p († page 46) if the magnitude of the load is constant and if the load acting on:

Fig. 8 Alternating direction load

• radial and angular contact spherical plain bearings is purely radial • thrust spherical plain bearings is purely axial • rod ends is purely radial and in the direction of the shank axis In all other cases it is necessary to calculate the equivalent dynamic bearing load P. If the mag nitude of the load is not constant, use the equation provided in the section Variable load and sliding velocity († page 61).

Selection of bearing size Radial spherical plain bearings Radial spherical plain bearings can accommodate a certain magnitude of axial load Fa in add ition to a simultaneously acting radial load Fr († fig. 6 on page 41). When the resultant load is constant in magnitude, the equivalent dynamic bearing load can be calculated using P = y Fr

where P = equivalent dynamic bearing load [kN] Fr = radial component of the load [kN] y = load factor that depends on the ratio of the axial to the radial load Fa/Fr – for bearings requiring maintenance († diagram 1) – for maintenance-free bearings († diagram 2)

Diagram 1 Factor y for radial spherical plain bearings requiring maintenance

Diagram 2 Factor y for maintenance-free radial spherical plain bearings

2,5

1,5

0,05

0,1

0,15

0,2

0,25 Fa Fr

Other series

Series GEP .. FS

0,1

0,2

0,3

0,4 Fa Fr

Diagram 3 Factor y for angular contact spherical plain bearings

Diagram 4 Factor y for thrust spherical plain bearings

2,5

2,25

1,75

2 1,5

1,75 1,5

1,25

1,25 1

0,5

1,5

2 Fa Fr

If Fa/Fr > 2, use a thrust spherical plain bearing instead, or contact the SKF application engineering service.

0,1

0,2

0,3

0,4

0,5 Fr Fa

If Fr/Fa > 0,5, use an angular contact spherical plain bearing instead, or contact the SKF application engineering service.

Angular contact spherical plain bearings When the resultant load († fig. 9) is constant in magnitude, then use

Fig. 9 Angular contact spherical plain bearing under combined load

P = y Fr where P = equivalent dynamic bearing load [kN] Fr = radial component of the load [kN] y = load factor that depends on the ratio of the axial to the radial load Fa/Fr († diagram 3) Thrust spherical plain bearings Thrust spherical plain bearings can accommodate a radial load Fr in addition to an axial load Fa († fig. 10). However, the radial load must not exceed 50% of the simultaneously acting axial load. When the resultant load is constant in magnitude, then use P = y Fa

Fig. 10 Thrust spherical plain bearing under combined load

where P = equivalent dynamic bearing load [kN] Fa = axial component of the load [kN] y = load factor depending on the ratio of the radial to the axial load Fr/Fa († diagram 4)

Equivalent static bearing load If spherical plain bearings and rod ends are subjected to static loads, or very slight alignment movements, then the permissible load is not limited by wear, but by the strength of the sliding contact layer or the strength of the rod end housing. If the actual load is a combined load, then an equivalent static bearing load must be calculated. For radial and angular contact spherical plain bearings, it can be calculated using P0 = y Fr For thrust spherical plain bearings, it can be calculated using P0 = y Fa

where P0 = equivalent static bearing load [kN] Fr = radial component of the load [kN] Fa = axial component of the load [kN] y = load factor that depends on the ratio of the axial to the radial load Fa/Fr – for radial bearings requiring maintenance († diagram 1) – for maintenance-free radial bearings († diagram 2) – for angular contact spherical plain bearings († diagram 3) and load factor that depends on the ratio of the radial to the axial load Fr/Fa – for thrust spherical plain bearings († diagram 4) 43

Selection of bearing size

Permissible loads for rod ends Rod ends are primarily intended for the support of radial loads acting in the direction of the shank axis. If loads act at angles to the shank axis († fig. 11), the maximum permissible load is reduced, as additional bending stresses occur in the shank. Under these conditions, consider the design and size dependent material used for the rod end housing († table 6 on page 170). The load portion acting perpendicular to the direction of the shank axis should never exceed the value of 0,1 C0. If heavier loads are involved, a larger rod end should be selected. The maximum permissible load for a rod end in the direction of the shank axis can be calculated using

Fig. 11 Rod end under combined load

Pperm = C0 b2 b6 where Pperm = maximum permissible load [kN] C0 = static load rating [kN] b2 = temperature factor – for rod ends requiring maintenance († table 5 on page 52) – for maintenance-free rod ends with the sliding contact surface combination – steel/PTFE sintered bronze († diagram 16 on page 55) – steel/PTFE fabric († diagram 17 on page 56) – steel PTFE FRP († diagram 19 on page 59) b6 = factor for the type of load († table 2)

Table 2 Factor b6 for rod end load type Type of load

Factor b6

Constant

+Fr

Pulsating magnitude (single direction)

+Fr Alternating direction

+Fr -Fr

0,5 (0,35)

The values in brackets apply to rod ends with a relubrication facility.

Requisite bearing size To determine the requisite size of a spherical plain bearing or rod end, it is necessary to know the requisite rating life for the application. This depends on the type of machine, the operating conditions and the demands regarding oper ational reliability. The following steps can be used to determine requisite bearing size: 1 Use the guideline values of the load ratio C/P provided in table 3 to obtain a requisite basic dynamic load rating C. Compare this value with the basic dynamic load rating of the bearings listed in the product tables. 2 Use diagrams 5 to 10 on pages 46 to 50 to check whether the sliding contact surface combination of the selected bearing or rod end can be used under the actual load p and sliding velocity v conditions. The specific bearing load p and the sliding velocity v needed to perform this check can be calculated as explained in the following sections: a) If the pv diagram indicates that the basic rating life equation can be used, proceed to step 3. b) If the pv diagram shows that the pv range is exceeded, select a bearing with a higher load carrying capacity. 3 Calculate the basic rating life († page 51) and proceed as follows: a) If the calculated rating life is shorter than the requisite rating life, a larger bearing or rod end should be selected and the calculation repeated. b) If the calculated rating life is larger than the requisite rating life, the bearing or rod end can be selected for the application.

Table 3 Guideline values for C/P Sliding contact surface combination

Load ratio C/P

Steel/steel

Steel/bronze

Steel/PTFE sintered bronze

1,6

Steel/PTFE fabric

Steel/PTFE FRP GAC .. F GX .. F GEP .. FS GEC .. FBAS

1,25 1,25 1,6 1,6

Rod ends

1,25

Table 4 Specific load factors Sliding contact surface combination

Specific load factors dyn. K stat. K0

–

N/mm2

Steel/steel Metric bearings Inch bearings

100 100

500 300

Steel/bronze

Steel/ PTFE sintered bronze

100

250

Steel/PTFE fabric Metric bearings Inch bearings

300 150

500 300

Steel/PTFE FRP GAC .. F GX .. F GEP .. FS GEC .. FBAS

50 50 80 80

80 80 120 120

Rod ends

The bearing or rod end size is often determined by the dimensions of the associated components. In these cases, check the pv diagram to determine if the product is suitable.

Selection of bearing size

Specific bearing load The magnitude of the specific bearing load can be calculated using P p = K ––– C where p = specific bearing load [N/mm2] K = specific load factor depending on the bearing design and sliding contact surface combin ation († table 4 on page 45) [N/mm2] P = equivalent dynamic bearing load [kN] C = basic dynamic load rating [kN]

Mean sliding velocity The mean sliding velocity for constant movement can be calculated using

where v = mean sliding velocity [m/s] When the operation is intermittent (not continuous), the mean sliding velocity should be calculated for a cycle of operation dm = inner ring mean diameter [mm] dm = dk for radial spherical plain bearings and rod ends dm = 0,9 dk for angular contact spherical plain bearings dm = 0,7 dk for thrust spherical plain bearings dk = inner ring sphere diameter [mm] b = half the angle of oscillation († fig. 3 on page 39), degrees [°], for rotation b = 90° f = frequency of oscillation [min–1], or rotational speed [min–1]

v = 5,82 ¥ 10–7 dm b f

Diagram 5 pv diagram for steel/steel sliding contact surface combination

500 p [N/mm2] 100

50 20 10

III

5 2 1 0,0001

0,001 0,002

0,005

0,01

Refer to Note 1 († page 47) for explanation of operating ranges.

0,02

0,05

0,1 0,2 0,3 v [m/s]

For intermittent movement, the angle of oscillation is usually given in units of time. In this case the mean sliding velocity can be calculated using

4b v = 8,73 ¥ 10–6 dm ––– t where b = half the angle of oscillation [°] († fig. 3 on page 39) t = time taken to pass through complete oscillation [s] Note 1: pv operating ranges I Range where rating life equation is valid II Quasi-static range; before using the rating life equation, contact the SKF application engineering service III Possible range of use, e.g. with very good lubrication; before using the rating life equation, contact the SKF application engineering service for additional information IV Extended range where rating life equation is valid provided the load is exclusively alternating Diagram 6 pv diagram for steel/bronze sliding contact surface combination

100 p [N/mm2] 50

20 10 5

1 0,0001 0,001 0,002

0,005 0,01

III

0,02

0,05

0,1

0,2 0,4 v [m/s]

Refer to Note 1 for explanation of operating ranges.

Selection of bearing size Note 2: pv operating ranges I Range where rating life equation is valid II Quasi-static range; rating life equation has limited validity, refer to the section Basic rating life, starting on page 39 III Possible range of use, e.g. with very good heat dissipation; before using the rating life equation, contact the SKF application engin足 eering service for additional information

Diagram 7 pv diagram for steel/PTFE sintered bronze sliding contact surface combination

300 200 p [N/mm2] 100

20 II

III

5 0,0001 0,001 0,002

Refer to Note 2 for explanation of operating ranges.

0,005 0,01 0,02

0,05

0,1

0,2

0,5 v [m/s]

Diagram 8 pv diagrams for steel/PTFE fabric sliding contact surface combination

Metric bearings

500

p [N/mm2]

200 100 50

20 II

III

10 5 0,0001

0,001 0,002

0,005 0,01 0,02

0,05

0,1

0,2

0,5 v [m/s]

Inch bearings

500

p [N/mm2]

200 100 50

20 II

III

10 5 0,0001

0,001 0,002

0,005 0,01 0,02

0,05

0,1

0,2

0,5 v [m/s]

Refer to Note 2 (â&#x20AC; page 48) for explanation of operating ranges.

Selection of bearing size Diagram 9 pv diagram for steel/PTFE FRP sliding contact surface combination, FS and FBAS designs

120 p [N/mm2] 100

III

20 II

5 0,0001

0,001

0,002

0,005

0,01

0,02

0,05

0,1 v [m/s]

Refer to Note 2 (â&#x20AC; page 48) for explanation of operating ranges. Diagram 10 pv diagram for steel/PTFE FRP sliding contact surface combination, F design

100 p [N/mm2] 50 III

20 II

5 0,0001

0,001

0,002

0,005

Refer to Note 2 (â&#x20AC; page 48) for explanation of operating ranges.

0,01

0,02

0,05

0,1 v [m/s]

Basic rating life calculation Steel/steel and steel/bronze sliding contact surface combinations, requiring maintenance The basic rating life for initial lubrication only, can be calculated using 330 Gh = b1 b2 b3 b4 b5 ––––– p2,5 v When the bearing is regularly relubricated after the initial lubrication GhN = Gh fb fH or GN = 60 f GhN The frequency of relubrication can be calculated using Gh H = ––– N

H = frequency of relubrication († diagram 15 on page 53) b1 = load condition factor, b1 = 1 for constant direction load b1 = 2 for alternating direction load b2 = temperature factor († table 5 on page 52) b3 = sliding factor († diagram 11) b4 = velocity factor († diagram 12 on page 52) b5 = factor for angle of oscillation († diagram 13 on page 52), refer to Note († page 53) p = specific bearing load [N/mm2] (for values of p < 10 N/mm2 use p = 10 N/mm2) v = mean sliding velocity [m/s] fb = factor depending on the angle of oscillation († diagram 14 on page 53), refer to Note († page 53) fH = factor depending on the frequency of relubrication († diagram 15 on page 53) f = frequency of oscillation [min–1] N = relubrication interval [h] If the basic rating life requirement is not met, the relubrication interval N should be shortened, or a larger bearing or rod end should be selected.

where Gh = basic rating life with initial lubrication only, operating hours [h] GhN = basic rating life with regular relubrication, operating hours [h] GN = basic rating life with regular relubrication, number of oscillations Diagram 11 Sliding factor b3 for steel/steel and steel/bronze sliding contact surface combinations

5 b3

100

200

dk [mm]

500

Selection of bearing size Diagram 12 Velocity factor b4 for steel/steel and steel/bronze sliding contact surface combinations

15 10

steel/bronze

5 steel/steel

1 0,002

0,005

0,01

0,02

0,05

v [m/s]

0,1

Table 5 Temperature factor b2 for steel/steel and steel/bronze sliding contact surface combinations Operating temperature over incl. °C

Diagram 13 Angle of oscillation factor b5 for steel/steel and steel/ bronze sliding contact surface combinations

Temperature factor b2

–

120

1,0

120

160

0,9

160

180

0,8

180

–

Contact the SKF application engineering service

b5 5

I 2

The temperature limits for integral seals († table 6 on page 79) and SKF greases († table 1 on page 87) must also be considered.

b [°]

If b < 5°, the value of b5 for b = 5° should be used.

Diagram 14 Multiplication factor fb for steel/steel and steel/bronze sliding contact surface combinations

6 fb 5

4 I

NOTE: SKF manufactures all metric steel/steel radial spherical plain bearings with an outside diameter D ≥ 150 mm as standard with the multi-groove feature in the outer ring († page 17). The extra large grease reservoir in the bear ing, made possible by the multi-groove system, extends relubrication intervals and bearing service life, especially in applications where there are constant direction loads († page 40). These advantages are considered in the calculation of the basic rating life by the coloured regions in diagrams 13 and 14 for the factors for the angle of oscillation b5 and fb. The values of these two factors in the upper limit of the coloured area may be used for bearings with the multi-groove system.

15 b [°]

If b < 5°, the value of fb for b = 5° should be used. Diagram 15 Relubrication factor fH for steel/steel and steel/bronze sliding contact surface combinations

6 fH 5

If H < 5, the values indicated by the broken line can be used.

Selection of bearing size

Maintenance-free steel/PTFE sintered bronze sliding contact surface combination The basic rating life can be calculated using 1 400 Gh = b1 b2 ––––– p1,3 v or G = 60 f Gh where Gh = basic rating life, operating hours G = basic rating life, number of oscillations b1 = load condition factor († table 6) b2 = temperature factor († diagram 16) p = specific bearing load [N/mm2] v = mean sliding velocity [m/s] f = frequency of oscillation [min–1]

Table 6 Load condition factor b1 for the steel/PTFE sintered bronze sliding contact surface combination Type of load Factor b1

Permissible specific bearing load1)

–

N/mm2

Constant load2) Single direction

up to 100

Variable load Alternating direction or pulsating magnitude at a frequency up to 0,5 Hz over 0,5 up to 5 Hz

0,4 0,2

up to 60 up to 40

1) Inertia forces should also be taken into consideration. 2) For constant load, oscillating frequencies above 300 min–1

and very short sliding distances, b1 = 1 cannot be used because of possible material fatigue. For additional information, contact the SKF application engineering service.

NOTE: Basic rating life calculations consider the influence of the load and sliding velocity. Under very light loads and/or low sliding velocities, the result shows relatively long life. The longer the service life the more important is the influence of contaminants such as dirt, moisture and corrosion. Depending on the operating conditions, accurate life calculations may not be possible.

Diagram 16 Temperature factor b2 for the steel/PTFE sintered bronze sliding contact surface combination

1,0 b2 0,8

0,6

0,4

0,2

100 120 140 160 Operating temperature t [째C]

Selection of bearing size

Maintenance-free steel/PTFE fabric sliding contact surface combination

The basic rating life can be calculated using Kp G = b b b –––– h 1 2 4 pn v or G = 60 f Gh where Gh = basic rating life, operating hours G = basic rating life, number of oscillations b1 = load condition factor († table 7) b2 = temperature factor († diagram 17) b4 = velocity factor († diagram 18 on page 58) Kp = constant for the specific bearing load († table 8) p = specific bearing load [N/mm2] n = exponent for the specific bearing load († table 8) v = mean sliding velocity [m/s] f = frequency of oscillation [min–1]

Diagram 17 Temperature factor b2 for steel/PTFE fabric sliding contact surface combination

1,0 b2 0,8 0,6 0,4 0,2

100 120 140 160 Operating temperature t [°C]

Table 7 Load condition factor b1 for steel/PTFE fabric sliding contact surface combination Type of load Factor b11)

Specific bearing load

–

N/mm2

Constant Single direction

up to 300

Variable load Alternating direction or pulsating magnitude at a frequency up to 0,5 Hz

0,55 0,4

up to 50 50 to 100

over 0,5 to 1 Hz

0,35 0,15

up to 50 50 to 100

over 1 to 5 Hz

0,1

up to 50

1) The factor b covers several parameters that affect the 1

bearing life. Depending on the operating conditions, higher b1 values can be applied. Contact the SKF application engineering service. Table 8

Constant Kp and exponent n for steel/PTFE fabric sliding contact surface combination Specific bearing load1) over incl.

Constant Kp Exponent n

N/mm2

–

– 25 90

770 4 000 40 000

0,2 0,7 1,2

25 90 300

1) For inch bearings, specific bearing load may not exceed 150 N/mm2 († table 4 on page 45).

Selection of bearing size Diagram 18 Velocity factor b4 for steel/PTFE fabric sliding contact surface combination

1,0 0,9

p = 5 N/mm2

0,8 0,7

0,6

0,5

100

0,4 0,3 0,2 0,1 0,0 0,001

0,005

0,01

0,05

0,1

0,5 1 v [m/s]

0,50 0,45

p = 100 N/mm2

0,40

120

0,35

140

0,30

160

0,25

180

0,20 0,15 0,10 0,05 0,00 0,001

200

220

240 260 280 300

0,005

0,01

0,05

0,1 v [m/s]

Maintenance-free steel/PTFE FRP sliding contact surface combination The basic rating life can be calculated using KM Gh = b1 b2 b3 –––– pv or G = 60 f Gh where Gh = basic rating life, operating hours G = basic rating life, number of oscillations b1 = load condition factor († table 9) b2 = temperature factor († diagram 19) b3 = sliding factor († table 10 on page 60) KM = material constant († table 10 on page 60) p = specific bearing load [N/mm2] v = mean sliding velocity [m/s] f = frequency of oscillation [min–1] NOTE: 1. The basic rating life calculated from the above equation can be doubled if the bearings are relubricated occasionally (refer to the sections Lubrication, starting on page 84 and Relubrication on page 90) 2. Rating life calculations consider the influence of the load and sliding velocity. Under very light loads, and/or low sliding velocities, the result shows relatively long life. The longer the service life the more important is the influence of contaminants such as dirt, moisture and corrosion. Depending on the operating conditions, accurate life calculations may not be possible.

Table 9 Load condition factor b1 for steel/PTFE FRP sliding contact surface combination Type of load Factor b1

Permissible specific bearing load1)

–

N/mm2

Constant load2) Single direction GAC .. F GX .. F GEP .. FS GEC .. FBAS

1 1 1 1

up to 50 up to 50 up to 80 up to 80

Variable load Alternating direction or pulsating magnitude at a frequency up to 0,5 Hz over 0,5 up to 5 Hz

0,25 0,1

up to 40 up to 25

1) Inertia forces should also be taken into consideration. 2) For constant load, oscillating frequencies above 300 min–1

and very short sliding distances, b1 = 1 cannot be used because of possible material fatigue. For additional information, contact the SKF application engineering service.

Diagram 19 Temperature factor b2 for steel/PTFE FRP sliding contact surface combination

1,0 b2 0,8 0,6 0,4 0,2

40 60 80 100 Operating temperature t [°C]

Selection of bearing size Table 10 Sliding factor b3 and constant KM for steel/PTFE FRP sliding contact surface combination Bearing type Series

Nominal bore diameter d over incl.

Sliding factor

Constant

–

Radial bearings GEP .. FS GEC .. FBAS

– 180 440 – 440

180 440 – 440 –

1 1,15 1,35 1 1,15

1 055 1 055 1 055 1 055 1 055

Angular contact bearings1) GAC .. F

– 60

60 –

1 1,5

480 480

Thrust bearings GX .. F

– 60

60 –

1 1,5

670 670

530

Rod ends

1) For preloaded bearings that cannot be re-adjusted, always use b = 1. 3

Variable load and sliding velocity If the load and/or sliding velocity change during operation, calculate individual rating lives for the periods of constant load and sliding velocity. If the load and sliding velocity occur as shown in diagram 20a, the individual basic rating life can be calculated using the constant values of p and v. If the load and sliding velocity are not constant as shown in diagram 20b, first calculate the basic rating life for the individual time periods, using mean values for the load and sliding velocity for the individual time periods. Then calculate the total basic rating life using

1 Gh = ———————————–– tI tII tIII ––––– + ––––– + ––––– + … T GhI T GhII T GhIII where Gh = total basic rating life, operating hours tI, tII … = time during which p1 and v1, p2 and v2 etc. pertain [h] T = total duration of one cycle (= tI + tII + tIII + …) [h] GhI … = individual values of basic rating life for conditions p1 and v1, p2 and v2 etc., operating hours

Diagram 20 Alternating load and variable sliding velocity

v p

p1 v1

p2 v2

v2 p3 v3

t II

t III

p4 v4

v3 p3

t IV

t III

t II

b 61

Selection of bearing size

Calculation examples The following calculation examples illustrate the methods used to determine the requisite bearing size or the basic rating life for spherical plain bearings and rod ends. 1. Torque support of a concrete transporter Given data

Purely radial load that alternates direction: Fr = 12 kN Half angle of oscillation: b = 15° († fig. 3 on page 39) Frequency of oscillation: f = 10 min–1 Maximum operating temperature: +80 °C Requirements

The bearing must have a basic rating life of 7 000 h. Calculations and selection

Because a bearing in this application must accommodate an alternating load, a steel/steel radial spherical plain bearing is the appropriate choice. Relubrication is planned after every 40 hours of operation. If, for the first check, a guideline value of 2 is used for the load ratio C/P († table 3 on page 45), the required basic dynamic load rating C for the bearing is C = 2 P = 24 kN Bearing GE 20 ES, with a C = 30 kN and a sphere diameter dk = 29 mm, is chosen from the product table on page 104. To check the suitability of the bearing using the pv diagram († diagram 5 on page 46), calculate the specific bearing load using K = 100 from table 4 on page 45. P 12 p = K –– = 100 ¥ –––– = 40 N/mm2 C 30

and the sliding velocity v using dm = dk = 29 mm, b = 15° and f = 10 min–1 v = 5,82 ¥ 10–7 dm b f = 5,82 ¥ 10–7 ¥ 29 ¥ 15 ¥ 10 = 0,0025 m/s The values for p and v lie within the permissible operating range I of the pv diagram († diagram 5 on page 46), for steel/steel radial spherical plain bearings. To calculate the basic rating life for initial lubrication, the values that apply are b1 = 2 (alternating direction load) b2 = 1 (operating temperature < 120 °C from table 5 on page 52) b3 = 1,5 (from diagram 11 on page 51, for dk = 29 mm) b4 = 1,1 (from diagram 12 on page 52, for v = 0,0025 m/s) b5 = 3,7 (from diagram 13 on page 52, for b = 15°) p = 40 N/mm2 v = 0,0025 m/s Therefore 330 Gh = b1 b2 b3 b4 b5 ––––– p2,5 v 330 = 2 ¥ 1 ¥ 1,5 ¥ 1,1 ¥ 3,7 ¥ ––––––––––––– 402,5 ¥ 0,0025 ≈ 160 operating hours The basic rating life of the bearing that is relubricated regularly can now be calculated using fb = 5,2 (from diagram 14 on page 53) fH = 1,8 (from diagram 15 on page 53, for a relubrication frequency H = Gh/N = 160/40 = 4 with the relubrication interval of 40 h) GhN = Gh fb fH = 160 ¥ 5,2 ¥ 1,8 ≈ 1 500 operating hours

Because this life is shorter than the required rating life of 7 000 h, a larger bearing is chosen and calculations are repeated. Bearing GE 25 ES, with C = 48 kN and dk = 35,5 mm, is chosen. The values for the specific bearing load lie within the permissible operating range I of the pv diagram († diagram 5 on page 46)

NOTE: The SKF Interactive Engineering Catalogue incorporates programs to perform these and many other calculations quickly and accur ately. These programs can be run any number of times to find the best possible solution. The SKF Interactive Engineering Catalogue is available online at www.skf.com.

12 p = 100 ¥ –––– =25 N/mm2 48 and the sliding velocity is v = 5,82 ¥ 10–7 ¥ 35,5 ¥ 15 ¥ 10 = 0,0031 m/s As before b1 = 2, b2 = 1, b5 = 3,7 and now b3 = 1,6 (from diagram 11 on page 51, for dk = 35,5 mm) b4 = 1,2 (from diagram 12 on page 52 , for v = 0,0031 m/s) Therefore, the basic rating life for initial lubrication is 330 Gh = 2 ¥ 1 ¥ 1,6 ¥ 1,2 ¥ 3,7 ¥ ––––––––––––– 252,5 ¥ 0,0031 ≈ 480 operating hours With fb = 5,2 (from diagram 14 on page 53) and fH = 3 (from diagram 15 on page 53 for H = 480/40 = 12) the basic rating life for regular relubrication (N = 40 h) becomes GhN = 480 ¥ 5,2 ¥ 3 ≈ 7 490 operating hours This larger bearing satisfies the rating life requirement.

Selection of bearing size 2. Attachment of a shock absorber of an off-highway vehicle

The values for p and v lie within the permissible operating range I of the pv diagram where

Given data:

b1 = 0,2 (from table 6 on page 54, for a load frequency over 0,5 Hz and 25 < p < 40 N/mm2) b2 = 1 (from diagram 16 on page 55, for temperatures < 80 °C)

Radial load: Fr = 7 kN Axial load: Fa = 0,7 kN Half angle of oscillation: b = 8° († fig. 3 on page 39) Frequency of oscillation: f = 15 min–1 Load frequency: 2–5 Hz Maximum operating temperature: +75 °C

The basic rating life for a GE 20 C bearing with the steel/PTFE sintered bronze sliding contact surface combination is

Requirements:

This bearing must have a basic rating life corresponding to a driven distance of 100 000 km at an average speed of 65 km/h without maintenance. Calculations and selection

For design reasons, a GE 20 C spherical plain bearing with a steel/PTFE sintered bronze sliding contact surface combination is proposed. From the product table on page 132, the basic dynamic load rating C = 31,5 kN and the sphere diameter dk = 29 mm are obtained. First, the equivalent dynamic bearing load must be determined by Fa/Fr = 0,7/7 = 0,1 From diagram 2 on page 42 factor y = 1,4. The equivalent dynamic bearing load is therefore P = y Fr = 1,4 ¥ 7 = 9,8 kN To check the suitability of the bearing size using the pv diagram 7 on page 48, calculate the values for the specific bearing load (using K = 100 from table 4 on page 45) using P 9,8 p = K –– = 100 ¥ –––– = 31 N/mm2 C 31,5 and the sliding velocity (dm = dk = 29 mm). v = 5,82 ¥ 10–7 dm b f = 5,82 ¥ 10–7 ¥ 29 ¥ 8 ¥ 15 = 0,002 m/s

1 400 Gh = b1 b2 ––––– p1,3v 1 400 = 0,2 ¥ 1 ¥ –––––––––––– 311,3 ¥ 0,002 ≈ 1 600 operating hours This basic rating life corresponds to a distance (at an average speed of 65 km/h) of 1 600 ¥ 65 = 104 000 km. Therefore, the bearing satisfies the rating life requirement.

3. A 320-bar hydraulic cylinder on a fully automatic press for building industry waste Given data

Radial load (constant direction) Operation case

Load Fr

Time period t

I II III

300 kN 180 kN 120 kN

10% 40% 50%

The number of press cycles n = 30 per hour, and the movement between the end positions (90°) is made in 10 seconds. The operating temperature is less than +50 °C. Requirements

A maintenance-free radial spherical plain bearing with a steel/PTFE fabric sliding contact surface combination is required for a rating life of 5 years with 70 h of operation per week. Calculations and selection

Using a guideline value for the load ratio C/P = 2 († table 3 on page 45), and with P = FrI the required basic dynamic load rating C = 2 P = 2 ¥ 300 = 600 kN From the product table on page 136, a GE 60 TXE-2LS bearing with a basic dynamic load rating C = 695 kN and a sphere diameter dk = dm = 80 mm is chosen. First, it is necessary to check that the oper ation cases I to III fall within the permissible range of the pv diagram 8 on page 49. The sliding velocity is the same for all three cases. The angle of oscillation is specified as 2b, the time t as the time taken to pass through 2b in seconds. Complete cycle duration is 4b († fig 3 on page 39). 2b v = 8,73 ¥ 10–6 dm –– t 90 = 8,73 ¥ 10–6 ¥ 80 ¥ –– = 0,0063 m/s 10

The specific bearing load, p = K(P/C), using K = 300 from table 4 on page 45 , is

for case I P 300 pI = K –– = 300 ¥ –––– = 129,5 N/mm2 C 695 for case II P 180 pII = K –– = 300 ¥ –––– = 77,7 N/mm2 C 695 for case III P 120 pIII = K –– = 300 ¥ –––– = 51,8 N/mm2 C 695 The values for pI, pII, pIII and v are within the permissible range I of the pv diagram 8 on page 49. To make the lifetime estimate for variable loads and/or sliding velocities, the calculation of each load case has to be made separately, with the equation for TX bearings first Kp Gh = b1 b2 b4 ––– pnv The parameters b1, b2, b4, Kp and n are defined on page 56 and are as follows b1 = 1 (from table 7 on page 57, constant load) b2 = 1 (from diagram 17 on page 56, operating temperature < +50 °C) b4 = (from diagram 18 on page 58) b4 I = 0,31 b4 II = 0,48 b4 III = 0,57 Kp = (from table 8 on page 57) Kp I = 40 000 Kp II = 4 000 Kp III = 4 000 n = (from table 8 on page 57) n1 = 1,2 n2 = 0,7 n3 = 0,7

Selection of bearing size for case I 40 000 GhI = 1 ¥ 1 ¥ 0,31 ¥ ––––––––––––––––– 129,51,2 ¥ 0,0063

= 5 745 operating hours

for case II 4 000 GhII = 1 ¥ 1 ¥ 0,48 ¥ ––––––––––––––– 77,70,7 ¥ 0,0063

= 14 477 operating hours

for case III 4 000 GhII = 1 ¥ 1 ¥ 0,57 ¥ ––––––––––––––– 51,80,7 ¥ 0,0063

= 22 833 operating hours

Using the calculated basic rating lives of the three operation cases, the total basic rating life for continuous operation is († page 61) 1 Gh = ——————————— tI tII tIII ––––– + ––––– + ––––– T G hI T G hII T G hIII For tI, tII etc., the percentages given in the operating data are inserted (with T = tI + tII + tIII = 100%.) 1 Gh = —————————————————— 10 40 50 –––––––––– + ––––––––––– + ––––––––––– 100 ¥ 5 745 100 ¥ 14 477 100 ¥ 22 833

≈ 14 940 operating hours

The required life of five years should be met assuming the machine is operated 70 h/week, 30 cycles/hour and 50 weeks per year, to 525 000 cycles or 2 916 operating hours. (Note that time for a complete cycle is 20 s.) GN, Req = 5 ¥ 70 ¥ 30 ¥ 50 = 525 000 cycles Gh, Req = (525 000 ¥ 20)/3600 = 2 916 h.

4. Linkages of a conveyor installation Given data

Radial load of alternating direction: Fr = 5,5 kN Half angle of oscillation: b = 15° († fig. 3 on page 39) Frequency of oscillation: f = 25 min–1 Operating temperature: +70 °C Requirements

A rod end is needed that provides a basic rating life of 9 000 hours under alternating load conditions. Calculations and selection

Because the load is alternating, a steel/steel rod end is appropriate. Relubrication is planned every 40 hours of operation. Using the guideline value for the load ratio C/P = 2 from table 3 on page 45, and as P = Fr, the requisite basic dynamic load rating is C = 2 P = 2 ¥ 5,5 = 11 kN The SI 15 ES rod end with a basic dynamic load rating C = 17 kN is selected († page 172). The basic static load rating is C0 = 37,5 kN and the sphere diameter dk = 22 mm. To check the suitability of rod end size using the pv diagram 5 on page 46, calculate the values for the specific bearing load (using K = 100 from table 4 on page 45)

C0 b2

= 37,5 kN = 1 (from table 5 on page 52, for temperatures < 120 °C) b6 = 0,35 (from table 2 on page 44, for rod ends with a lubrication hole) Pperm = C0 b2 b6

= 37,5 ¥ 1 ¥ 0,35 = 13,125 kN > P The following values of the factors are used to determine the basic rating life for initial lubrication only b1 = 2 (alternating load) b2 = 1 (for operating temperatures < 120 °C, from table 5 on page 52) b3 = 1,3 (from diagram 11 on page 51, for dk = 22 mm) b4 = 1,6 (from diagram 12 on page 52, for v = 0,0048 m/s) b5 = 3,7 (from diagram 13 on page 52, for b = 15°) p = 32 N/mm2 v = 0,0048 m/s Therefore 330 Gh = b1 b2 b3 b4 b5 –––––––––––––– 32,42,5 ¥ 0,0048

P 300 p = K –– = 100 ¥ –––– = 32,4 N/mm2 C 695

330 = 2 ¥ 1 ¥ 1,3 ¥ 1,6 ¥ 3,7 ¥ –––––––––––––– 32,42,5 ¥ 0,0048

and the mean sliding velocity (dm = dk = 22 mm)

≈ 177 operating hours

v = 5,82 ¥ 10–7 dk b f

The basic rating life for regular relubrication (N = 40 h) with

= 5,82 ¥ 10–7 ¥ 22 ¥ 15 ¥ 25 = 0,0048 m/s The values for p and v lie within the permissible range I of the pv diagram 5 on page 46. Checking the permissible load on the rod end housing

fb = 5,2 (from diagram 14 on page 53) and fH = 2 (from diagram 15 on page 53, for H = Gh/N = 177/40 = 4,4) GhN = Gh fb fH = 177 ¥ 5,2 ¥ 2 ≈ 1 840 operating hours

Selection of bearing size The required basic rating life of 9 000 h is not achieved; therefore a larger rod end has to be selected. A SI 20 ES rod end, with C = 30 kN, C0 = 57 kN and dk = 29 mm is selected and the calculation repeated. The values for the specific bearing load P 5,5 p = K –– = 100 ¥ –––– = 18,3 N/mm2 C 30 and the mean sliding velocity (dm = dk = 29 mm) v = 5,82 ¥ 10–7 ¥ 29 ¥ 15 ¥ 25 = 0,0063 m/s both lie within the permissible range I. It is not necessary to check the permissible rod end housing load since the basic static load rating of the larger rod end is higher. Also, as before b1 = 2; b2 = 1 and b5 = 3,7 while b3 = 1,4 (from diagram 11 on page 51, for dk = 29 mm) b4 = 1,8 (from diagram 12 on page 52, for v = 0,0063 m/s) so that 330 Gh = 2 ¥ 1 ¥ 1,4 ¥ 1,8 ¥ 3,7 ¥––––––––––––––– 18,32,5 ¥ 0,0063

≈ 681 operating hours

With fb = 5,2 (from diagram 14 on page 53) and fH = 3,7 (from diagram 15 on page 53, for H = 681/40 ≈ 17) the basic rating life for regular relubrication (N = 40 h) becomes GhN = 681 ¥ 5,2 ¥ 3,7

≈ 13 100 operating hours

Therefore, the larger rod end meets the rating life requirements.

Friction

The friction in a spherical plain bearing or rod end depends primarily on the sliding contact surface combination, the load and the sliding velocity. Because there are so many influencing factors that are not mutually independent, it is not possible to quote exact values for the coefficient of friction. Under laboratory conditions, however, it is possible to record the coefficient of friction for different sliding contact surface combinations. The friction during the running-in phase is higher than the value recorded during the subsequent test period. Guideline values for the coefficient of friction µ are listed in table 1. They have been determined in laboratory trials. The coefficient of friction for maintenancefree steel/PTFE fabric and steel/PTFE sintered bronze sliding contact surface combinations decrease with increasing specific load. At a constant specific load, friction is reduced to the given minimum value as soon as the transfer of PTFE from the sliding layer to the opposing steel surface is complete. The frictional moment for a spherical plain bearing or rod end can be calculated using M = 0,5 μ P dm where M = frictional moment [Nm] μ = coefficient of friction († table 1) P = equivalent dynamic bearing load [kN] dm = inner ring mean diameter [mm] dm = dk for radial spherical plain bearings and rod ends dm = 0,9 dk for angular contact spherical plain bearings dm = 0,7 dk for thrust spherical plain bearings dk = inner ring sphere diameter [mm]

Table 1 Coefficient of friction for different sliding contact surface combinations (guideline values) Sliding contact surface combination

Coefficient of friction µ min max

Steel/steel Steel/bronze Steel/PTFE sintered bronze Steel/PTFE fabric Steel/PTFE FRP

0,08 0,10 0,05 0,02 0,05

0,20 0,25 0,25 0,15 0,20

After the bearing has been in operation for an extended period of time, negative influences (contamination, inadequate lubrication) may cause the bearing to approach or exceed the maximum values for the coefficient of friction listed in the table. Bearings are susceptible to this phenomenon even under light loads and especially under harsh operating conditions. In applications where friction is particularly important, SKF recommends determining the power ratings by using the maximum values for the coefficient of friction that are listed in table 1. For bearings operating under conditions of mixed or dry friction, there may be slight differences between adhesive and sliding friction. Experience has shown that it is not possible to eliminate stick-slip entirely and that it most frequently occurs when support elements lack adequate stiffness. In most applications, however, the effects are negligible.

Design of bearing arrangements

Design of bearing arrangements Radial location of bearings The inner and outer rings of spherical plain bearings must be radially secured (located) to the shaft and in the housing so that sliding movements occur in the bearing and do not result in ring creep. Ring creep occurs when a ring turns on its seat in the circumferential direction under load. To locate a bearing in the radial direction usually requires an interference fit. However, an interference fit cannot always be applied, e.g. if easy mounting and dismounting are required, or if the bearing must be able to be displaced axially without restraint. The appropriate fit is always determined by the operating conditions.

This reduces the initial internal clearance in the bearing, prior to operation. The operating clearance († fig. 2) furthermore takes the load and operating temperature into consideration. The initial radial internal clearance of bearings differs, depending on the type and size of the bearing. The clearance has been selected so that if the recommended tolerances for the shaft and housing seats are applied, an appropriate operating clearance (or preload) remains in the bearing under normal operating conditions. If a tight interference fit is used for both bearing rings, or if the operating temperatures are unusual, it may be necessary to use a larger initial internal clearance than “Normal” for steel/steel bearings.

1. Type and magnitude of the load

3. Temperature conditions

The degree of interference must suit the type and magnitude of the load, i.e. the heavier the load and the stronger the shock loads, the tighter the interference required († fig. 1). • Under heavy loads, spherical plain bearings deform elastically, which may affect the interference fit and lead to ring creep. • The strength of the associated components must be adequate to accommodate the loads and fully support the bearing. • If the associated components deform, there is a risk that through-hardened bearing rings crack. • Steel/steel radial spherical plain bearings require a tighter fit than comparable main tenance-free bearings, which have a lower coefficient of friction. 2. Bearing internal clearance

An interference fit on the shaft and in the housing causes the inner ring to expand elastically, and the outer ring to be compressed elastically. 70

In operation, the bearing rings normally have a higher temperature than their seats. This means that

• the inner ring fit gets loosen († fig. 3) • the outer ring fit becomes tighter and may restrict any required axial displacement in the housing. If there is a considerable temperature difference between the inner ring and outer ring, there is a change in the operating clearance. This condition must be considered when selecting the fit or the bearing could seize, making it difficult or impossible for the shaft to turn.

Fig. 1 For heavier loads a tighter interference fit is needed

4. Design of associated components

The bearing seats on the shaft and in the housing must not lead to uneven distortion (out-of-round) of the bearing rings († fig. 4). Therefore: • Split housings are not suitable for interference fits. • Thin-walled housings, light alloy housings and hollow shafts require a tighter fit than thick-walled steel or cast iron housings and solid shafts – and must have sufficient strength. • Heavy loads and interference fits require thick-walled one-piece steel or cast iron housings and solid steel shafts.

Fig. 2 Reduction of the clearance in the bearing

Bearing initial radial internal clearance

Operating clearance

Fig. 3 Change to the fit with temperature

Fig. 4 Out-of-round bearing seat

F SK GE

RS ES-2 30

Design of bearing arrangements Fig. 5

5. Axial displacement of non-locating bearings

A non-locating bearing provides radial support only and must always be able to be displaced axially († fig. 5). This is normally achieved by selecting a loose fit for one of the bearing rings, generally the inner ring of a spherical plain bearing. Reasons include the following:

Axial displacement

• The shaft seat can be easily and economically hardened and ground to facilitate axial displacement. The hardness of the shaft should be at least 50 HRC. • The outer rings of most spherical plain bearings are axially fractured at one or two positions, or are radially split. This can make axial displacement difficult, if not impossible. • The housing bore should be protected against wear. Surface finish of seats

The recommended surface roughness for bearing seats is in accordance with ISO 4288:1997.

Fig. 6 ISO shaft and housing tolerance classes

H11

• for shaft seats Rz ≤ 10 μm • for housing bore seats Rz ≤ 16 μm Recommended fits

Only a limited number of ISO tolerance classes are appropriate for spherical plain bearings. Fig. 6 shows schematically the relative positions of these in relation to the bore and outside diameter of the bearings. The recommended tolerance classes for • the shaft seat are provided in table 1 • the housing bore are provided in table 2 These recommendations are based on the considerations described above and have been confirmed in a wide variety of bearing applications. The ISO tolerance limits are listed in • table 3 on page 74 for shafts • table 4 on page 74 for housing bores To facilitate the calculation of the minimum and maximum values of the theoretical interference or clearance, the standardized bearing bore diameter deviations (Δdmp) and the bearing outside diameter deviations (ΔDmp) are listed in tables 3 and 4.

H7 J7 K7 M7 N7

+ 0

Table 1 Shaft fits

Operating conditions

Tolerance classes Sliding contact surface combination

steel/steel and steel/bronze

steel/PTFE sintered bronze, steel/PTFE fabric and steel/PTFE FRP

Radial spherical plain bearings Loads of all kinds, interference fit

m6 (n6)1)

Loads of all kinds, clearance or transition fit

h6 (hardened shaft)

h6 or g6 (hardened shaft)

Angular contact spherical plain bearings Loads of all kinds, interference fit m6 (n6)

Thrust spherical plain bearings Loads of all kinds, interference fit m6 (n6)

The tolerance classes in brackets should be selected for very heavily loaded bearings. If selected, be sure that the residual operating clearance is sufficient for proper performance of the bearing or whether a bearing with larger clearance must be used.

1) These recommendations do not apply to bearings in the GEG series, which have a bore diameter tolerance class to H7 and are

normally mounted on shaft seats machined to tolerance class m7. If, for mounting reasons, the shaft is machined to tolerance class f7, it should be hardened as movements of the shaft relative to the bearing bore take place and wear may result.

Table 2 Housing fits Operating conditions

Tolerance classes Sliding contact surface combination

steel/steel

steel/PTFE sintered bronze, steel/PTFE fabric and steel/PTFE FRP

Radial spherical plain bearings Light loads, axial displacement required

Heavy loads

M7 (N7)

Light alloy housings

Angular contact spherical plain bearings Loads of all kinds, interference fit M7 (N7)

Loads of all kinds, can generally be displaced axially

Thrust spherical plain bearings Purely axial loads H11

H11

Combined loads

The tolerance classes in brackets should be selected for very heavily loaded bearings. If selected, be sure that the residual operating clearance of the radial bearing is sufficient for proper performance or whether a bearing with larger clearance must be used.

Design of bearing arrangements Table 3 ISO tolerance classes for shafts Shaft Nominal diameter d over incl.

Bearing Bore diameter tolerance Ddmp low high

Shaft diameter deviations Tolerance classes g6 high low

µm

3 6 10

6 10 18

–8 –8 –8

0 0 0

–4 –5 –6

18 30 50

30 50 80

–10 –12 –15

0 0 0

80 120 180

120 180 250

–20 –25 –30

250 315 400

315 400 500

500 630 800 1 000

h6 high low

k6 high low

m6 high low

n6 high

low

–12 –14 –17

0 0 0

–8 –9 –11

+9 +10 +12

+1 +1 +1

+12 +15 +18

+4 +6 +7

+16 +19 +23

+8 +10 +12

–7 –9 –10

–20 –25 –29

0 0 0

–13 –16 –19

+15 +18 +21

+2 +2 +2

+21 +25 +30

+8 +9 +11

+28 +33 +39

+15 +17 +20

0 0 0

–12 –14 –15

–34 –39 –44

0 0 0

–22 –25 –29

+25 +28 +33

+3 +3 +4

+35 +40 +46

+13 +15 +17

+45 +52 +60

+23 +27 +31

–35 –40 –45

0 0 0

–17 –18 –20

–49 –54 –60

0 0 0

–32 –36 –40

+36 +40 +45

+4 +4 +5

+52 +57 +63

+20 +21 +23

+66 +73 +80

+34 +37 +40

630 800 1 000

–50 –75 –100

0 0 0

–22 –24 –26

–66 –74 –82

0 0 0

–44 –50 –56

+44 +50 +56

0 0 0

+70 +80 +90

+26 +30 +34

+88 +100 +112

+44 +50 +56

1 250

–125

–28

–94

–66

+66

+106 +40

+132

+66

Table 4 ISO tolerance classes for housings Housing Nominal bore diameter d over incl.

Bearing Outside diameter tolerance DDmp high low

Housing bore diameter deviations Tolerance classes H11 low high

µm

10 18 30

18 30 50

0 0 0

–8 –9 –11

0 0 0

50 80 120

80 120 150

0 0 0

–13 –15 –18

150 180 250

180 250 315

0 0 0

315 400 500

400 500 630

H7 low high

J7 low high

K7 low high

M7 low high

N7 low

high

+110 +130 +160

0 0 0

+18 +21 +25

–8 +10 –9 +12 –11 +14

–12 –15 –18

+6 +6 +7

–18 –21 –25

0 0 0

–23 –28 –33

–5 –7 –8

0 0 0

+190 +220 +250

0 0 0

+30 +35 +40

–12 +18 –13 +22 –14 +26

–21 –25 –28

+9 +10 +12

–30 –35 –40

0 0 0

–39 –45 –52

–9 –10 –12

–25 –30 –35

0 0 0

+250 +290 +320

0 0 0

+40 +46 +52

–14 +26 –16 +30 –16 +36

–28 –33 –36

+12 +13 +16

–40 –46 –52

0 0 0

–52 –60 –66

–12 –14 –14

0 0 0

–40 –45 –50

0 0 0

+360 +400 +440

0 0 0

+57 +63 +70

–18 +39 –20 +43 – –

–40 –45 –70

+17 +18 0

–57 –63 –96

0 0 –26

–73 –16 –80 –17 –114 –44

630 800 800 1 000 1 000 1 250

0 0 0

–75 –100 –125

0 0 0

+500 +560 +660

0 0 0

+80 +90 +105

– – –

–80 0 –90 0 –105 0

–110 –30 –124 –34 –145 –40

–130 –50 –146 –56 –171 –66

1 250 1 600 1 600 2 000

0 0

–160 –200

0 0

+780 +920

0 0

+125 +150

– –

–125 0 –150 0

–173 –48 –208 –58

–203 –78 –242 –92

Axial location of bearings Locating bearings

Fig. 7 Using an end plate and cover to locate a bearing axially

An interference fit alone is not sufficient to axially locate a bearing ring. It is usually necessary to use a suitable locking device to secure the ring in place. Both rings of a locating bearing should be located axially on both sides. The bearing rings generally have an interference fit and are usually supported on one side by a shaft or housing shoulder. Inner rings are axially secured on the opposite end by • a plate bolted to the shaft end († fig. 7) • a spacer sleeve between the ring and a neighbouring machine component († fig. 8) • a retaining ring (circlip) Outer rings are generally retained by the cover of the housing bore († figs. 7 and 8).

Fig. 8 Using a spacer sleeve and cover to locate a bearing axially

Non-locating bearings For non-locating bearings, the outer ring (which normally has a tight fit) is axially located while the inner ring is free to move axially on the shaft († fig. 5 on page 72). Note that for bearings in the GEP series († fig. 9), which have a radially split outer ring, expansion forces are produced under purely radial load; the axial components of these forces act on the housing cover. The axial load acting on the cover may be as much as 30% of the radial load. This must be taken into account when Fig. 9 Locating a radial spherical plain bearing having a radially split outer ring

Design of bearing arrangements dimensioning the housing cover and selecting the size and number of the attachment bolts. If shaft and/or housing shoulders are undesirable because of manufacturing or assembly considerations, spacer sleeves or rings can be inserted between a bearing ring and an adjacent machine component (â&#x20AC; figs. 10 and 11). Axially locating a non-separable bearing with locating rings (â&#x20AC; figs. 10 and 11) saves space, enables quick mounting and dismounting and simplifies the machining of the seats. If larger axial forces have to be accommodated, a support ring (â&#x20AC; fig. 11) should be placed between the bearing ring and the locating ring, so that the locating ring is not subjected to excessive bending moments. To locate the bearing, retaining rings (also known as circlips) with a constant radial width in accordance with DIN 471:1981 or DIN 472:1981 can be used.

Fig. 10 Locating a bearing axially, using retaining rings in the housing and adjacent components on the shaft

Fig. 11 Locating a bearing axially, using adjacent components in the housing and a support ring and a retaining ring on the shaft

Fig. 12 Shaft and housing abutment dimensions

rb ra

Fig. 13

Abutment and fillet dimensions The abutment and fillet dimensions should be such that:

Shaft and housing fillet dimensions, no undercut

• A sufficiently large support surface is available for the bearing ring. • Moving parts of the bearing arrangement cannot contact stationary components. • The fillet radius should be smaller than the chamfer of the bearing.

rbmax r2min

Appropriate abutment dimensions († fig. 12) are provided for each bearing in the product tables. The transition from the bearing seat to the shaft or housing shoulder can be either a simple fillet († fig. 13) or an undercut († fig. 14). Dimensions for ramax and rbmax are listed in the product tables. Dimensions for undercuts are provided in table 5. The larger the fillet radius (for the simple form) of the transition to the shaft shoulder, the more favourable is the stress distribution in the shaft fillet area.

r2min ramax r1min r1min

Fig. 14 Shaft and housing fillet dimensions, with an undercut

ba r2min

Table 5

r2min

Undercut dimensions Chamfer dimensions r1min, r2min

Fillet dimensions ba ha rc

rc r1min r1min ba

1 2 0,2 1,1 2,4 0,3 1,5 3,2 0,4 2 4 0,5 2,5 4 0,5 3 4,7 0,5 4 5,9 0,5 5 7,4 0,6 6 8,6 0,6 7,5 10 0,6

1,3 1,5 2 2,5 2,5 3 4 4 6 7

Design of bearing arrangements

Location of rod ends The inner rings of rod ends can be axially located by a shaft shoulder, a nut or a retaining ring. Rod ends mounted on threaded rods or in extension tubes should be secured by an extra nut on the rod or the external thread of the rod end shank. The nut should be securely tightened against the support surface on the rod end housing or on the tube (â&#x20AC; fig. 15).

Fig. 15 Attachment of rod ends

Sealing Most bearing arrangements must be sealed to prevent contaminants, such as dirt and moisture, from entering the bearing. The efficiency of the seal has a decisive influence on the service life of the bearing. In contrast to most other bearing types, which only move in one plane, the alignment capabilities of spherical plain bearings place additional demands on the seal. To select appropriate seals, several factors have to be considered, including: • the permissible angle of tilt • the available space • environmental conditions • the effectiveness of the seal • the type of lubricant and the frequency of relubrication • the justifiable cost

inventory and assembly costs. Design characteristics and suitability of the RS seals and the LS heavy-duty seals are provided in table 6. Table 7 on pages 80 to 81, provides an overview of external sealing possibilities, their design characteristics and their suitability to meet different application requirements. SKF supplies most of the external seals introduced in table 7. NOTE: SKF additional information about the seals referred to in table 7 on pages 80 to 81, refer to the SKF Interactive Engineering Catalogue, available online at www.skf.com. SKF also supplies sealing strips made of felt (FS strips) or aluminium-boron silicate (FSB strips) for high temperature applications.

Depending on the application, one or more of the above factors outweigh the others. It is therefore not possible to establish general rules for seal design. Most SKF radial spherical plain bearing series are available with integral seals. Standard sealed bearings can increase the service life of the bearings and save space, while reducing Table 6 SKF integral seals for spherical plain bearings Seal Illustration Design characteristics

Suitability

RS design

Double-lip contact seal made of • polyester elastomer for metric bearings with a bore diameter d < 320 mm (–30 to +130 °C) • acrylonitrile-butadiene rubber for metric bearings with a bore diameter d ≥ 320 mm (–35 to +100 °C) • polyurethane for inch bearings (–20 to +80 °C)

• for compact bearing arrangements, mainly indoors • for cramped spaces • for high sealing demands when combined with an outboard seal • for long service life with minimal maintenance • for arrangements with bearings that rotate

LS design

Triple-lip heavy-duty contact seal made of acrylonitrile-butadiene rubber with sheet steel insert (–55 to +110 °C, for short periods up to +125 °C)

• for compact bearing arrangements • for high sealing demands • for long service life with minimal maintenance • for arrangements with bearings that rotate • for difficult operating conditions in the presence of sand or mud

Design of bearing arrangements Table 7 External seals for spherical plain bearings Seal Illustration Design characteristics

Suitability

Gap-type

Simple and economic, no wear, simple mounting

• for maintenance-free bearings • for small angles of tilt • for high temperatures • for moderately dusty environments • for arrangements with bearings that rotate

Gap-type with grease

Simple and efficient with periodic relubrication

• for bearings and rod ends requiring maintenance • for small angles of tilt • for rough conditions in the presence of sand, clay, slush etc.

V-shaped

Simple, lightly preloaded seal made of polyurethane (–40 to +100 °C)

• for contaminant exclusion • for angles of tilt up to 2° • for bearing arrangements with shaft diameters up to 300 mm • for arrangements with bearings that rotate

Good wear strength and resistance to grease, oil and other environmental influences

V-ring

Elastic seal that sits on the shaft and turns with it, axial sealing lip made of acrylonitrile-butadiene rubber (–40 to +100 °C) or fluoro rubber (–40 to +200 °C) Good wear and chemical resistance

• for contaminant exclusion • for maintenance-free and grease-lubricated bearings • for all shaft diameters • for angles of tilt between 2 and 4°, depending on size • for arrangements with bearings that rotate

Felt

Simple to install, good resistance to grease (–40 to +100 °C)

• for dust and minor dampness exclusion • for grease retention • for large angles of tilt • for all bearing sizes • for arrangements with bearings that rotate

Radial shaft

Steel reinforced (either externally or internally) elastomer with a acrylonitrile-butadiene rubber lip (–40 to +100 °C) or fluoro rubber lip (–40 to +200 °C)

• for contaminant exclusion • for grease retention • for oil retention • for small angles of tilt • for all bearing sizes • for arrangements with bearings that rotate

Good wear resistance, good resistance to grease, oil and other environmental influences

Table 7 External seals for spherical plain bearings Seal Illustration Design characteristics Radial shaft with an auxiliary dust lip

Steel reinforced (either externally or internally) elastomer with an acrylonitrile-butadiene rubber lip (–40 to +100 °C) or fluoro rubber lip (–40 to +200 °C) Good wear resistance, good resistance to grease, oil and other environmental influences

• for highly contaminated environments • for oil retention • for small angles of tilt • for bearings with a bore diameter d up to approx. 300 mm • for arrangements with bearings that rotate

O-ring

Acrylonitrile-butadiene rubber (–40 to +100 °C) or fluoro rubber (–40 to +200 °C)

• for reliable moisture exclusion • for oil and grease retention • for very small angles of tilt • for slow oscillating movements

Profiled rubber with clamp and lock

Elastomer strip (–40 to +100 °C)

• for hermetically sealed bearing arrangements • for slow oscillating movements. Initial oiling or greasing of faces reduces friction • for small angles of tilt

Mechanical seals

Stainless steel rings and cup springs of acrylonitrile-butadiene rubber (–40 to +100 °C)

Good wear resistance, good resistance to grease, oil and other environmental influences

Spring steel washers

Set of washers for high temperatures. Excellent wear resistance, good chemical resistance

Suitability

• for contaminant exclusion • for oil and grease retention • for small angles of tilt • for arrangements with bearings that rotate

• for contaminant exclusion • grease exit vents needed in housing cover if grease used • for small angles of tilt • for arrangements with bearings that rotate

WARNING! Some of the external seals listed in this table can be made of fluoro rubber. Note that fluoro rubber gives off dangerous fumes at temperatures above 300 °C and can be hazardous if touched. As handling seals made of fluoro rubber constitutes a potential safety risk, the safety precautions must always be followed. For detailed information about the safety precautions, refer to the SKF Interactive Engineering Catalogue, available online at www.skf.com, the SKF General Catalogue or the publication Industrial shaft seals.

Design of bearing arrangements

Designing a bearing arrangement for easy mounting and dismounting

Fig. 16 Chamfering shaft ends and housing bore entrances

To facilitate mounting, the shaft ends and housing bores should have a 10 to 20 degree lead-in chamfer († fig. 16). This is particularly important for applications using larger bearings, as the rings may skew, causing damage to the mating surfaces. To facilitate the use of withdrawal tools when removing bearings, it can be advantageous to: • provide recesses in the shaft shoulder († fig. 17) • provide recesses or threaded holes in the housing bore († fig. 18) To dismount larger maintenance-free bearings with a bore diameter d ≥ 80 mm that have a tight shaft fit, SKF recommends using the oil injection method. With the oil injection method, oil under high pressure is injected between the bearing inner ring and its shaft seat to form an oil film. This oil film separates the mating surfaces, greatly reducing the force required to dismount the bearing and virtually eliminating any risk of damage to the bearing or shaft. To use the oil injection method, there must be an oil supply duct in the shaft as well as an oil distribution groove in the seat († fig. 19). As a general rule, the distance between the groove and the bearing side face from which mounting and dismounting are to be performed should be approximately one third of the seat width († fig. 19). Recommended dimensions for the ducts and grooves as well as for the threads for the oil supply connection are provided in tables 8 and 9.

Fig. 17 Shaft shoulder with a recess

Fig. 18 Housing shoulder with threaded holes

Table 8

Recommended dimensions for oil supply ducts and distribution grooves

ba ra

Table 9

Design and recommended dimensions for threaded holes for connecting oil supply

L 3

60°

Na N

Bearing seat diameter over incl.

Dimensions ha ba

– 100 150

100 150 200

3 4 4

0,5 0,8 0,8

2,5 3 3

200 250 300

250 300 400

5 5 6

1 1 1,25

400 500 650

500 650 800

7 8 10

800

1 000

Gc Gb

Design A

Design B

Thread Design Ga

Dimensions Gb Gc1) Na max

–

2,5 3 3

G 1/8

4 4 4,5

4 4 5

G 1/4

G 3/8

1,5 1,5 2

5 6 7

G 1/2

G 3/4

2,5

1) Effective threaded length.

L = width of bearing seat. Fig. 19 Shaft with oil ducts and a distribution groove to facilitate dismounting

Lubrication

The SKF traffic light concept Most grease suppliers indicate the specific values for the low and high temperature limits inÂ their product information. The SKF traffic light concept is distinctly different from that. SKF recognizes that the really important temperatures for reliable operation lie within a smaller range. This range depends largely on the type of base oil and thickener used as well as the additives. The relevant temperatures are given by the SKF traffic light concept. They are schematically illustrated in diagrams 1 and 2 in the form of a double traffic light. It is evident that grease in the red zones should not be applied at all, as damage may occur. Within the green zone the grease functions reliably, and the grease life can be determined accurately. At temperatures in the amber zone above the high temperature performance limit (HTPL), grease ages and oxidize with increasing rapidity and the by-products of the oxidation have a detrimental effect on lubrication. AnÂ amber zone also exists for low temperatures. Short periods in this zone, e.g. during a cold start, are not harmful since the heat caused by friction brings the bearing temperature into the green zone.

Diagram 1 The SKF traffic light concept – general

Do not use Unreliable performance (use only for short periods) Reliable performance, i.e. with predictable grease life

Temperature

LTL

LTPL

HTPL

HTL

LTL – Low temperature limit This limit indicates the lowest temperature at which the grease allows the bearing to be started up without difficulty. LTPL – Low temperature performance limit Below this limit, the supply of grease to the contact surfaces becomes insufficient. HTPL – High temperature performance limit Above this limit, the grease ages and oxidize in an uncontrolled way, so that grease life cannot be determined accurately. HTL – High temperature limit When exceeding this limit, the grease loses its structure permanently.

Diagram 2 The SKF traffic light concept – temperature limits for SKF greases when used in spherical plain bearings requiring maintenance

Temperature, °C SKF greases Designation

–50

100

150

200

250

LGHB 2 LGMT 3 LGEP 2 LGGB 2

Lubrication Fig. 1 Relubricating the bearing via the outer ring

Spherical plain bearings requiring maintenance Steel/steel radial spherical plain bearings must be relubricated to: • reduce friction • reduce wear • extend bearing service life • protect against corrosion and contaminants

Fig. 2 Relubricating the bearing via the inner ring

Fig. 3 Relubricating the bearing from the side

The sliding contact surfaces are phosphated and treated with a “running-in” lubricant. This special surface treatment has a favourable influence during the running-in phase. The bearings must be greased prior to use and relubricated on a regular basis. To reliably relubricate the bearings, grease ducts should be provided in the housing († fig. 1) or shaft († fig. 2) so that fresh grease can be supplied directly to the bearing. All SKF steel/steel radial spherical plain bearings (with the exception of the smallest E and ESA design bearings) have an annular groove and lubrication holes in both the inner and outer rings to facilitate lubricant distribution to the sliding surfaces of the bearing. If the arrangement is appropriately designed, the bearing can also be supplied with grease from the side. To facilitate the passing of grease through the bearing, the grease should be prevented from exiting the bearing arrangement from the side it is supplied, e.g. by an end cover, and to provide an opening for the grease to exit on the opposite side, e.g. a V-ring seal that can open if there is pressure from the inside († fig. 3). Generally, where possible, the free space surrounding the bearing should be filled with grease.

SKF recommends using SKF LGHB 2 grease to lubricate steel/steel spherical plain bearings. Its properties include:

• excellent performance under heavy loads • very good rust inhibitor • very good resistance to ageing • good water resistance • a wide operating temperature range. If operating temperatures exceed the temperature range limits, special grease should be used († table 1). For additional information, contact the SKF application engineering service.

Table 1 SKF grease recommendations Property

SKF greases (designation) LGHB 2 LGMT 3 for sliding contact surface combinations steel/steel steel/bronze

Thickener

Calcium sulphonate complex soap

Base oil Colour

LGEP 2

LGGB 21)

steel/PTFE FRP

Lithium soap

Lithium/calcium soap

Mineral oil

Ester oil

Brown

Yellowish brown

Light brown

White

–20 to +150

–30 to +120

–20 to +110

–40 to +120

Kinematic viscosity of base oil, mm2/s at +40 °C at +100 °C

400 to 450 26,5

120 to 130 12

200 16

110 13

Consistency (to NLGI Scale)

Temperature LTL to HTPL

range2), °C

1) Grease biologically degradable, for use in applications where strict ecological demands must be met and where lubrication

cannot be dispensed with.

2) Refer to the SKF traffic light concept, starting on page

84.

Lubrication

Maintenance-free spherical plain bearings Steel/PTFE sintered bronze and steel/ PTFE fabric sliding contact surface combinations During operation, PTFE is transferred from the dry sliding contact surface of the outer ring to the hard chromium plated steel surface of the inner ring. Any external lubricant on the sliding contact surfaces would disturb this self-lubrication and shorten bearing service life. As a result, these bearings must not be lubricated and do not have any relubrication facility.

Steel/PTFE FRP sliding contact surface combination Bearings with this sliding contact surface combination are also self-lubricating and can be operated grease-free. However, initial lubrication followed by occasional relubrication of steel/PTFE FRP bearings can extend the service life of the bearing by a factor of two or more. The inner rings of radial bearings or shaft washers of angular contact and thrust bearings are coated with a lithium base grease before leaving the factory.

Fig. 4 Relubricating the bearing from the side

If operating conditions are such that protection against corrosion and enhanced sealing are required, the free space surrounding the bearing (â&#x20AC; fig. 4) can be filled with the same grease that was used to lubricate the bearing. The appropriate time to replenish or renew the grease in the bearing arrangement is determined by the operating conditions and the ageing of the grease. Rust inhibiting, water-repellent lithium base greases with a consistency of 2 on the NGLI scale should be used. SKF recommends SKF LGEP 2 grease (â&#x20AC; table 1 on page 87). Greases containing molybdenum disulphide or other solid lubricants should never be used. CAUTION: Depending on their design, SKF spherical plain bearings are either completely or partially coated with an oily preservative or filled with grease. Avoid skin contact as these substances may cause skin irritation or an allergic reaction.

Rod ends requiring maintenance

Fig. 5 Relubrication facilities for steel/steel rod ends

Steel/steel and steel/bronze rod ends require lubrication. To facilitate this: • All SKF steel/steel rod ends, with the exception of small-sized E and ESA design rod ends, can be relubricated via a lubrication hole or grease fitting in the rod end housing as well as via the pin and the inner ring († fig. 5). • All SKF steel/bronze rod ends can be relubricated via a lubrication hole or grease fitting in the rod end housing († fig. 6). The general recommendations for steel/steel radial spherical plain bearings also apply to steel/steel rod ends as well as steel/bronze rod ends. For steel/bronze rod ends in the SIKAC .. M and SAKAC .. M series, SKF recommends SKF LGMT 3 grease († table 1 on page 87). Lithium based greases with a normal consistency without solid lubricant additives can also be used.

Lubrication hole

Grease fitting

Fig. 6 Relubrication facilities for steel/bronze rod ends (sizes 6 and larger)

Maintenance-free rod ends Maintenance-free, self-lubricating rod ends are designed to be used as dry sliding bearings and must not be lubricated. Consequently, these rod ends do not have a relubrication facility in their housings. Steel/PTFE FRP rod ends are an exception. They can be used without additional lubricant, but their service life can be extended appreciably if they are lubricated prior to use.

SIKAC .. M series

SAKAC .. M series

CAUTION: Depending on their design, SKF rod ends are either completely or partially coated with an oily preservative or filled with grease. Avoid skin contact as these substances may cause skin irritation or an allergic reaction.

Relubrication

To maximize the service life of spherical plain bearings and rod ends requiring maintenance, they must be relubricated on a regular basis. This also applies to maintenance-free bearings with a steel/PTFE FRP sliding contact surface. Used grease containing wear debris and contaminants should be removed from the contact zone and replaced with fresh grease. Determining the proper relubrication interval is extremely important because the attainable service life depends on several factors including: • the magnitude of the load • the type of load • the angle of oscillation • the frequency of oscillation • the operating temperature • the sealing arrangement • other environmental conditions Long bearing service life can be attained when the following basic relubrication rules are observed: • the same type of grease is always used († table 1 on page 87) • the lubricant is applied at operating temperature • the lubricant is applied before a long interruption, e.g. before construction or agricultural equipment is stored Relubrication of non-locating bearings Non-locating bearings, where axial displacement takes place along the shaft or pin, should always be relubricated via the shaft and bearing inner ring († fig 2 on page 86). By supplying lubricant in this way, grease also enters between the mating surfaces of the inner ring and shaft seat. This reduces friction and induced axial loads when axial displacement occurs. 90

Storage SKF spherical plain bearings and rod ends are treated with a preservative before they are packaged. They can, therefore, be stored in their original packages for several years. However, the relative humidity in the storeroom should not exceed 60%. NOTE: SKF also supplies a comprehensive assortment of greases for various application requirements. For additional information, refer to the catalogue SKF Maintenance and Lubrication Products or online at www.mapro.skf.com.

SKF has the appropriate greases for spherical plain bearings and rod ends, including the biologically degradable SKF LGGB 2 grease

Mounting

Skill and cleanliness when mounting are necessary if spherical plain bearings and rod ends are to achieve maximum service life and not fail prematurely. Bearings and rod ends should only be removed from their packages immediately prior to mounting so that they do not become contaminated. Bearing components that could have become dirty as a result of improper hand ling or damaged packaging should be wiped clean with a lint-free cloth. The sliding contact surfaces of spherical plain bearings are matched to provide favourable friction and wear characteristics. Therefore, any alteration of the sliding surfaces can reduce bearing service life. Alterations in this context also include washing or exposing the sliding surfaces to solvents, cleaners, oils or similar media. All associated components should be clean and free of any burrs. Also make sure to check each associated component for dimensional accuracy before the installation process is started.

Spherical plain bearings When mounting spherical plain bearings with a fractured or split outer ring, it is essential that the joint is positioned at 90° to the direction of load († fig. 1), otherwise service life is reduced. Steel or plastic bands that hold together spherical plain bearing outer rings must not be removed prior to mounting. They are positioned in an annular groove and do not protrude from the outside diameter surface. Spherical plain bearing outer rings that are axially split and bolted together must be mounted as such, without loosening the bolts.

Mechanical mounting The following tools are suitable for mounting spherical plain bearings: • a mounting dolly († fig. 2) or length of tubing; the ring with an interference fit should generally be mounted first • a dolly having two abutment surfaces († fig. 3) for simultaneously mounting the bearing on the shaft and in the housing • for larger numbers of bearings, suitable tools can be used in combination with a press († fig. 4) When mounting spherical plain bearings, consider the following: • Never use a hammer or pin punch to drive a bearing in place, as either could damage the rings († fig. 5). • The mounting force should never be directed through the sliding contact surfaces († fig. 6). This could damage the sliding contact surfaces and/or expand fractured or split bearing outer rings, which can cause an increase in the mounting force required.

Fig. 1 Plane of fracture or split and main direction of load

Fig. 2 Mounting with the aid of a dolly

Fig. 3 Simultaneous mounting in the housing and on the shaft

Fig. 5 Never hit the bearing rings directly

Fig. 4 Mounting using a press

Fig. 6 Never apply the mounting force via the sliding contact surfaces

Mounting

Hot mounting As a rule, larger bearings cannot be mounted cold because the force required to press a bearing into position increases considerably with its size. Therefore, SKF recommends the following: • heat the bearing before it is mounted on the shaft († fig. 7) • heat non-split housings before inserting the bearing To mount a bearing on a shaft, a temperature differential of 60 to 80 °C between ambient temperature and the heated inner ring, is usually sufficient. For housings, the appropriate differential depends on the degree of interference and the seat diameter. However, a moderate Fig. 7 Mounting a heated bearing

Fig. 8 Mounting a heated large bearing

increase in temperature is usually sufficient. When heating the bearing, do not exceed the temperature limit of any associated components, such as the seals. For an even and risk-free heat source, an induction heater should be used. The use of an SKF induction heater has a number of advantages. It heats the bearing rapidly and a built-in thermostat prevents overheating. The non-metallic components, such as the seals or PTFE fabric, remain cold as does the heater itself. SKF induction heaters automatically demagnetize the bearing after it has been heated. Mounting bearings by cooling the shaft or the bearing is not recommended, as the very low temperatures required inevitably cause condensation, thus creating the risk of corrosion. To ease the mounting of large bearings, particularly if they have been heated, it is possible to use slings and a hoist. Metal or textile slings placed around the outer ring can be used. A spring between the hoist hook and the sling also facilitates bearing handling († fig. 8).

Warning ! Maintenance-free spherical plain bearings and rod ends must never be subjected to temperatures in excess of +280 °C due to the PTFE content. PTFE is completely inert below this temperature but at higher temperatures (from approx. 320 °C) it rapidly decomposes. The fluorine compounds released during this process are extremely toxic, even in small quantities, and can cause serious injury. It should also be remembered that the material is dangerous to handle once it has been overheated, even after it has cooled. Heat-resistant gloves should be worn when handling hot components.

Rod ends 1

Rod ends are fitted on pins and shafts in the same way as spherical plain bearings. Slight heating reduces the force required for mounting and reduce the risk of damaging associated components. When attaching rod ends to threaded rods or extension tubes (â&#x20AC; fig. 9) a counter lock nut should be used on the rod or on the external thread of the rod end. It should be securely tightened against the abutment surface on the rod end or tube. NOTE: SKF supplies a comprehensive range of mechanical and hydraulic tools as well as heating equipment for bearing mounting and dismounting. For additional information, refer to the catalogue SKF MaintenÂance and Lubrication Products or online at www.mapro.skf.com.

Fig. 9 Securing a rod end with a right-hand thread

Dismounting

Spherical plain bearings If bearings are to be re-used after dismounting, the same care and attention are required during dismounting as when mounting. The requisite withdrawal force should always be applied to the ring which is being dismounted. SKF offers an assortment of different pullers to accommodate many applications. If the shaft is pre-machined to accommodate the arms of a jaw puller, then a two- or three-armed puller can be used († fig. 1). In other cases where there is enough space behind the ring, a strong back puller such as the SKF TMBS series can be used († fig. 2). For large bearings with an interference fit, dismounting is considerably facilitated if the SKF oil injection method is used († fig. 3). The oil ducts and distributor grooves should be provided when designing the bearing arrangement († page 82). Small bearings can be dismounted using a mounting dolly or a length of tubing applied to the outer ring. For larger bearings with an interference fit, a mechanical or hydraulic press should be used when possible. It is also possible to dismount a bearing from the housing bore by quickly heating the housing without heating the bearing outer ring to any extent.

Rod ends To dismount rod ends, the lock nut securing the shank should be loosened and, if possible, the rod end should be unscrewed from its rod or tube. The rod end can then be removed from the pin or shaft in the same way as a bearing, e.g. using a puller or a press. 96

Fig. 1 Removing a bearing with a jaw puller

Fig. 2 A strong back puller facilitates dismounting of the inner ring

Fig. 3 Dismounting a bearing using the SKF oil injection method

Radial spherical plain bearings requiring maintenance

Dimensions...................................................................................................................................... Tolerances........................................................................................................................................ Radial internal clearance................................................................................................................. Materials.......................................................................................................................................... Permissible operating temperature range.....................................................................................

100 101 102 102 102

Product tables......................................................................................................... 2.1 Radial spherical plain plain bearings, steel/steel, metric sizes................................................. 2.2 Radial spherical plain plain bearings, steel/steel, inch sizes.................................................... 2.3 Radial spherical plain plain bearings with an extended inner ring, steel/steel, metric sizes... 2.4 Radial spherical plain plain bearings with an extended inner ring, steel/steel, inch sizes.......

104 104 110 116 120

Radial spherical plain bearings requiring maintenance A characteristic feature of SKF steel/steel radial spherical plain bearings is the outer ring, which is intentionally fractured so that it can be sprung apart to enable the inner ring to be inserted († fig. 1). The bearings are therefore nonseparable and easy to handle. The bearings are manganese phosphated and the sliding contact surface is then treated with a running-in lubricant. This reduces friction and wear during the running-in period. To facilitate lubrication, all bearings, with the exception of some small sizes, have an annular groove and two lubrication holes in both the inner and outer rings. Metric bearings with an outside diameter D ≥ 150 mm also have the SKF multigroove system († page 17) in the outer ring sliding contact surface as standard († fig. 2). Upon request, SKF can also supply smaller metric and inch size bearings with the multigroove system. With the multi-groove system, SKF solved the problem of lubricant starvation in steel/steel bearings. Lubricant starvation is a common cause of premature bearing failure in applications where minor alignment movements are made under heavy, constant direction loads. The multi-groove system improves lubricant distribution in the heavily loaded zone to extend bearing service life and/or maintenance intervals.

Fig. 1 The fractured outer ring enables the bearing to be assembled

Fig. 2 Spherical plain bearing with the multi-groove system in the outer ring

Dimensions The dimensions of spherical plain bearings in the GE, GEH and GEG series are in accordance with ISO 12240-1:1998. Bearings in the GEM series, which have an extended inner ring, have a non-standard inner ring width, but otherwise have the same dimensions as GE series bearings. Inch spherical plain bearings in the GEZ series are in accordance with the American Standard ANSI/ABMA Std. 22.2-1988.

100

Fig. 3 Spherical plain bearing with the multi-groove system, fitted with LS heavy-duty seals

Tolerances The dimensional tolerances for metric radial spherical plain bearings requiring maintenance in the GE, GEG, GEH and GEM series are listed in table 1. The dimensional tolerances for inch radial spherical plain bearings in the GEZ, GEZH and GEZM series are listed in table 2 on page 103. Outer ring tolerances apply to con ditions before fracture and surface treatment. Accordingly, inner ring tolerances apply to rings before surface treatment. The tolerances are in accordance with ISO 12240-1:1998 (metric bearings) and ANSI/ABMA Std. 22.2-1988 (inch bearings). The symbols used in the tolerance tables are explained in the following:

d nominal bore diameter Ddmp deviation of the mean bore diameter from the nominal D nominal outside diameter DDmp deviation of the mean outside diameter from the nominal DBs deviation of the single inner ring width from the nominal DCs deviation of the single outer ring width from the nominal

Table 1 Dimensional tolerances for metric radial spherical plain bearings requiring maintenance Nominal diameter d, D over incl.

GE, GEH and GEM series Inner ring DBs Ddmp high low high low

GEG series Inner ring Ddmp DBs high low high low

All series Outer ring DDmp high low

DCs high low

µm

– 6 10 18

6 10 18 30

0 0 0 0

–8 –8 –8 –10

0 0 0 0

–120 –120 –120 –120

– – +18 +21

– – 0 0

– – –180 –210

– 0 0 0

– –8 –8 –9

– 0 0 0

– –240 –240 –240

30 50 80

50 80 120

0 0 0

–12 –15 –20

0 0 0

–120 –150 –200

+25 +30 +35

0 0 0

–250 –300 –350

0 0 0

–11 –13 –15

0 0 0

–240 –300 –400

120 150 180

150 180 250

0 0 0

–25 –25 –30

0 0 0

–250 –250 –300

+40 +40 +46

0 0 0

–400 –400 –460

0 0 0

–18 –25 –30

0 0 0

–500 –500 –600

250 315 400

315 400 500

0 – –

–35 – –

0 – –

–350 – –

– – –

0 0 0

–35 –40 –45

0 0 0

–700 –800 –900

101

Radial spherical plain bearings requiring maintenance

Radial internal clearance Steel/steel radial spherical plain bearings are produced with Normal radial internal clearance as standard. The actual values are listed in tables 3 and 4. Prior to ordering, check availability of bearings with a smaller (C2) or larger (C3) radial internal clearance than Normal. The clearance values for metric bearings are in accordance with ISO 12240-1:1998.

Materials The inner and outer rings of SKF steel/steel radial spherical plain bearings are made of bearing steel. They are through-hardened, ground and phosphated. The sliding contact surfaces are treated with a running-in lubricant. Depending on the bore diameter, metric bearings with a 2RS suffix have a double-lip seal made of a polyester elastomer or acrylo nitrile-butadiene rubber on both sides of the bearing († table 6 on page 79). Inch bearings with a 2RS suffix have a double-lip seal made of polyurethane on both sides of the bearing. Metric and inch bearings with the designation suffix -2LS have a sheet steel reinforced, triple-lip heavy-duty seal made of acrylonitrilebutadiene on both sides of the bearing.

102

Permissible operating temperature range Open steel/steel radial spherical plain bearings have a permissible operating temperature range of –50 to +200 °C, but their load carrying capacity is reduced at temperatures above +120 °C. Bearings for higher temperature applications up to 300 °C, can be produced on request. For sealed bearings, the permissible operating temperature range is limited by the seal material: • –20 to +80 °C for inch RS seals • –30 to +130 °C for metric RS seals with a bore diameter d < 320 mm • –35 to +100 °C for metric RS seals with a bore diameter d ≥ 320 mm • –55 to +110 °C for LS seals The operating temperature range of the grease used to lubricate the bearings must also be taken into consideration.

Table 2 Dimensional tolerances for inch bearings Nominal diameter d, D over incl.

GEZ, GEZH and GEZM series Inner ring DBs Ddmp high low high low

µm

– 2 3

0 0 0

–13 –15 –20

0 0 0

3.1875 4.75 4.75 6 6 7

0 0 –

–20 –25 –

–

2 3 3.1875

8.75

Outer ring DDmp high low

DCs high low

–130 –130 –130

0 0 0

–13 –15 –15

0 0 0

–130 –130 –130

0 0 –

–130 –130 –

0 0 0

–20 –25 –25

0 0 0

–130 –130 –130

–

–30

–130

Table 3 Radial internal clearance for steel/steel radial spherical plain bearings, metric sizes Bore diameter d over incl.

Radial internal clearance C2 Normal min max min max

µm

– 12 20 35

12 20 35 60

8 10 12 15

32 40 50 60

60 90 140

90 140 200

18 18 18

72 85 100

200 240

240 300

18 18

110 125

C3 min

max

68 82 100 120

104 124 150 180

72 85 100

142 165 192

212 245 284

110 125

214 239

318 353

Bearings in the GEH series, with a bore diameter d = 20, 35, 60 and 90 mm, have a radial internal clearance range corresponding to the next larger diameter range. Table 4 Radial internal clearance for steel/steel radial spherical plain bearings, inch sizes Bore diameter d over incl.

Radial internal clearance C2 Normal min max min max

µm

– 0.625

0.625 2

15 25

75 105

50 80

2 3

3 6

30 40

130 160

100 130

C3 min

max

150 180

200 260

200 230

300 350

103

Radial spherical plain bearings, steel/steel, metric sizes d 4 – 40 mm B C

r2 r1

D dk

b1 d

GE .. E

GE .. ES

GE .. ES-2RS GE .. ES-2LS

GEH .. ES-2RS GEH .. ES-2LS

Principal dimensions Angle Basic load ratings Mass of tilt1) dynamic static d D B C a C C0

Designations2) without seals suffix for with standards seals heavy-duty seals

degrees

–

2,04

10,2

0,003

GE 4 E

–

3,4

0,004

GE 5 E

–

3,4

0,004

GE 6 E

–

5,5

27,5

0,008

GE 8 E

–

8,15

40,5

0,012

GE 10 E

–

10,8

0,017

GE 12 E

–

26 26

12 12

9 9

8 8

17 17

85 85

0,032 0,032

GE 15 ES GE 15 ES-2RS

– –

30 30

14 14

10 10

21,2 21,2

106 106

0,050 0,050

GE 17 ES GE 17 ES-2RS

– –

35 35 42

16 16 25

12 12 16

9 9 17

30 30 48

146 146 240

0,065 0,065 0,16

GE 20 ES GE 20 ES-2RS GEH 20 ES-2RS

– -2LS -2LS

42 42 47

20 20 28

16 16 18

7 7 17

48 48 62

240 240 310

0,12 0,12 0,20

GE 25 ES GE 25 ES-2RS GEH 25 ES-2RS

– -2LS -2LS

47 47 55

22 22 32

18 18 20

6 6 17

62 62 80

310 310 400

0,16 0,16 0,35

GE 30 ES GE 30 ES-2RS GEH 30 ES-2RS

– -2LS -2LS

55 55 62

25 25 35

20 20 22

6 6 15

80 80 100

400 400 500

0,23 0,23 0,47

GE 35 ES GE 35 ES-2RS GEH 35 ES-2RS

– -2LS -2LS

62 62 68

28 28 40

22 22 25

7 6 17

100 100 127

500 500 640

0,32 0,32 0,61

GE 40 ES GE 40 ES-2RS GEH 40 ES-2RS

– -2LS -2LS

1) To fully utilize the angle of tilt, the shaft shoulder should not be made larger than d a max. 2) Bearings with an outside diameter D ≥ 150 mm have the multi-groove system in the outer ring as standard. Bearings with an

outside diameter D < 150 mm can be supplied with the multi-groove system on request (designation suffix ESL).

104

rb ra

2.1

Dimensions

Abutment and fillet dimensions

b b1 M d dk

da min

r1 min

r2 min

da max

Da min

Da max

ra max

rb max

–

0,3

5,5

6,2

7,6

10,7

0,3

–

0,3

6,6

9,5

12,6

0,3

–

0,3

7,5

9,5

12,6

0,3

–

0,3

9,6

10,2

12,3

14,5

0,3

–

0,3

11,7

13,2

17,5

15,2

0,3

–

0,3

13,8

17,1

20,4

0,3

22 22

2,3 2,3

1,5 1,5

0,3 0,3

16,9 16,9

18,4 18,4

20,9 22,8

24,3 24,3

0,3 0,3

25 25

2,3 2,3

1,5 1,5

0,3 0,3

19 19

20,7 20,7

23,7 26

28,3 28,3

0,3 0,3

29 29 35,5

3,1 3,1 3,1

2 2 2

0,3 0,3 0,3

0,3 0,3 0,6

22,1 22,1 22,7

24,2 24,2 25,2

27,6 30,9 36,9

33,2 33,2 39,2

0,3 0,3 0,3

0,3 0,3 0,6

35,5 35,5 40,7

3,1 3,1 3,1

2 2 2

0,6 0,6 0,6

28,2 28,2 28,6

29,3 29,3 29,5

33,7 36,9 41,3

39,2 39,2 44

0,6 0,6 0,6

40,7 40,7 47

3,1 3,1 3,9

2 2 2,5

0,6 0,6 0,6

0,6 0,6 1

33,3 33,3 33,7

34,2 34,2 34,4

38,7 41,3 48,5

44 44 50,9

0,6 0,6 0,6

0,6 0,6 1

47 47 53

3,9 3,9 3,9

2,5 2,5 2,5

0,6 0,6 0,6

1 1 1

38,5 38,5 38,8

39,8 39,8 39,8

44,6 48,5 54,5

50,9 50,9 57,8

0,6 0,6 0,6

1 1 1

53 53 60

3,9 3,9 4,6

2,5 2,5 3

0,6 0,6 0,6

1 1 1

43,6 43,6 44,1

45 45 44,7

50,3 54,5 61

57,8 57,8 63,6

0,6 0,6 0,6

1 1 1

105

Radial spherical plain bearings, steel/steel, metric sizes d 45 – 120 mm B C

a r1

D dk

r2 b1

GE .. ES

GE .. ES-2RS GE .. ES-2LS

GEH .. ES-2RS GEH .. ES-2LS

Principal dimensions Angle Basic load ratings Mass of tilt1) dynamic static d D B C a C C0

Designations2) without seals with standard seals

degrees

–

68 68 75

32 32 43

25 25 28

7 7 14

127 127 156

640 640 780

0,46 0,46 0,80

GE 45 ES GE 45 ES-2RS GEH 45 ES-2RS

– -2LS -2LS

75 75 90

35 35 56

28 28 36

6 6 17

156 156 245

780 780 1 220

0,56 0,56 1,60

GE 50 ES GE 50 ES-2RS GEH 50 ES-2RS

– -2LS -2LS

90 90 105

44 44 63

36 36 40

6 6 17

245 245 315

1 220 1 220 1 560

1,10 1,10 2,40

GE 60 ES GE 60 ES-2RS GEH 60 ES-2RS

– -2LS -2LS

105 105 120

49 49 70

40 40 45

6 6 16

315 315 400

1 560 1 560 2 000

1,55 1,55 3,40

GE 70 ES GE 70 ES-2RS GEH 70 ES-2RS

– -2LS -2LS

120 120 130

55 55 75

45 45 50

6 5 14

400 400 490

2 000 2 000 2 450

2,30 2,30 4,10

GE 80 ES GE 80 ES-2RS GEH 80 ES-2RS

– -2LS -2LS

130 130 150

60 60 85

50 50 55

5 5 15

490 490 610

2 450 2 450 3 050

2,75 2,75 6,30

GE 90 ES GE 90 ES-2RS GEH 90 ES-2RS

– -2LS -2LS

100

150 150 160

70 70 85

55 55 55

7 6 13

610 610 655

3 050 3 050 3 250

4,40 4,40 6,80

GE 100 ES GE 100 ES-2RS GEH 100 ES-2RS

– -2LS -2LS

110

160 160 180

70 70 100

55 55 70

6 6 12

655 655 950

3 250 3 250 4 750

4,80 4,80 11,0

GE 110 ES GE 110 ES-2RS GEH 110 ES-2RS

– -2LS -2LS

120

180 180 210

85 85 115

70 70 70

6 6 16

950 950 1 080

4 750 4 750 5 400

8,25 8,25 15,0

GE 120 ES GE 120 ES-2RS GEH 120 ES-2RS

– -2LS -2LS

suffix for heavy-duty seals

outside diameter D < 150 mm can be supplied with the multi-groove system on request (designation suffix ESL).

106

rb ra

2.1

Dimensions

Abutment and fillet dimensions

b b1 M d dk

da min

r1 min

r2 min

da max

Da min

Da max

ra max

rb max

60 60 66

4,6 4,6 4,6

3 3 3

0,6 0,6 0,6

1 1 1

49,4 49,4 49,8

50,8 50,8 50,1

57 61 66,2

63,6 63,6 70,5

0,6 0,6 0,6

1 1 1

66 66 80

4,6 4,6 6,2

3 3 4

0,6 0,6 0,6

1 1 1

54,6 54,6 55,8

56 56 57,1

62,7 66,2 79,7

70,5 70,5 84,2

0,6 0,6 0,6

1 1 1

80 80 92

6,2 6,2 7,7

4 4 4

1 1 1

66,4 66,4 67

66,8 66,8 67

76 79,7 92

84,2 84,2 99

1 1 1

92 92 105

7,7 7,7 7,7

4 4 4

1 1 1

76,7 76,7 77,5

77,9 77,9 78,3

87,4 92 104,4

99 99 113,8

1 1 1

105 105 115

7,7 7,7 9,5

4 4 5

1 1 1

87,1 87,1 87,2

89,4 89,4 87,2

99,7 104,4 112,9

113,8 113,8 123,5

1 1 1

115 115 130

9,5 9,5 11,3

5 5 5

1 1 1

97,4 97,4 98,2

98,1 98,1 98,4

109,3 112,9 131

123,5 123,5 143,2

1 1 1

100

130 130 140

11,3 11,3 11,5

5 5 5

1 1 1

107,8 107,8 108,1

109,5 109,5 111,2

123,5 131 141,5

143,2 143,2 153,3

1 1 1

110

140 140 160

11,5 11,5 13,5

5 5 6

1 1 1

118 118 119,5

121 121 124,5

133 141,5 157,5

153 153 172

1 1 1

120

160 160 180

13,5 13,5 13,5

6 6 6

1 1 1

129,5 129,5 130

135,5 135,5 138,5

152 157,5 180

172 172 202,5

1 1 1

107

Radial spherical plain bearings, steel/steel, metric sizes d 140 – 300 mm B C

a r1

D dk

GE .. ES

GE .. ES-2RS GE .. ES-2LS

Principal dimensions Angle Basic load ratings Mass of tilt1) dynamic static d D B C a C C0

Designations2) without seals with standard seals

degrees

–

140

210 210

90 90

70 70

7 7

1 080 1 080

5 400 5 400

11,0 11,0

GE 140 ES GE 140 ES-2RS

– -2LS

160

230 230

105 105

80 80

8 8

1 370 1 370

6 800 6 800

14,0 14,0

GE 160 ES GE 160 ES-2RS

– -2LS

180

260 260

105 105

80 80

6 6

1 530 1 530

7 650 7 650

18,5 18,5

GE 180 ES GE 180 ES-2RS

– -2LS

200

290 290

130 130

100 100

7 7

2 120 2 120

10 600 10 600

28,0 28,0

GE 200 ES GE 200 ES-2RS

– -2LS

220

320

135

100

2 320

11 600

35,5

GE 220 ES-2RS

-2LS

240

340

140

100

2 550

12 700

40,0

GE 240 ES-2RS

-2LS

260

370

150

110

3 050

15 300

51,5

GE 260 ES-2RS

-2LS

280

400

155

120

3 550

18 000

65,0

GE 280 ES-2RS

-2LS

300

430

165

120

3 800

19 000

78,5

GE 300 ES-2RS

-2LS

108

suffix for heavy-duty seals

rb ra

2.1

Dimensions

Abutment and fillet dimensions

b b1 M d dk

da min

r1 min

r2 min

da max

Da min

Da max

ra max

rb max

155,5 155,5

171 180

202,5 202,5

1 1

140

180 180

13,5 13,5

6 6

1 1

149 149

160

200 200

13,5 13,5

6 6

1 1

169,5 170 169,5 170

190 197

222 222

1 1

180

225 225

13,5 13,5

6 6

1,1 1,1

191 191

214 224,5

250,5 250,5

1 1

200

250 250

15,5 15,5

7 7

1,1 1,1

212,5 213,5 212,5 213,5

237,5 244,5

279,5 279,5

1 1

220

275

15,5

1,1

232,5 239,5

271

309,5

240

300

15,5

1,1

252,5 265

298

329,5

260

325

15,5

1,1

273

288

321,5

359

280

350

15,5

1,1

294

313,5

344,5

388,5

300

375

15,5

1,1

314

336,5

371

418,5

199 199

109

Radial spherical plain bearings, steel/steel, inch sizes d 0.5 – 2 in B C

r1 D dk

b1 d

GEZ .. ES

GEZ .. ES-2RS GEZ .. ES-2LS

GEZH .. ES

GEZH .. ES-2RS GEZH .. ES-2LS

Principal dimensions Angle Basic load ratings Mass Designations without seals of tilt1) dynamic static d D B C a C C0 in/mm

degrees lbf/kN

lb/kg

0.5 0.8750 0.437 0.375 6 3 150 9 340 0.044 12,700 22,225 11,10 9,53 14 41,5 0,020 0.625 1.0625 0.547 0.469 6 4 840 14 740 0.077 15,875 26,988 13,89 11,91 21,5 65,5 0,035 0.75 1.2500 0.656 0.562 6 7 090 20 930 0.12 19,050 31,750 16,66 14,28 31,5 93 0,055 0.875 1.4375 0.765 0.656 6 9 560 28 580 0.19 22,225 36,513 19,43 16,66 42,5 127 0,085 1 1.6250 0,875 0,750 6 12 600 37 350 0.26 25,400 41,275 22,23 19,05 56 166 0,12 1.25 2.0000 1.093 0.937 6 19 460 58 500 0.51 31,750 50,800 27,76 23,80 86,5 260 0,23 2.4375 1.390 1.125 8 28 125 84 375 1.20 61,913 35,31 28,58 125 375 0,54 1.375 2.1875 1.187 1.031 6 23 400 69 750 0.77 34,925 55,563 30,15 26,19 104 310 0,35 1.5 2.4375 1.312 1.125 6 28 130 84 380 0.93 38,100 61,913 33,33 28,58 125 375 0,42 2.8125 1.580 1.312 7 38 250 114 750 1.75 71,438 40,13 33,33 170 510 0,79 1.75 2.8125 1.531 1.312 6 38 250 114 750 1.40 44,450 71,438 38,89 33,33 170 510 0,64 3.1875 1.820 1.500 7 50 400 150 750 2.50 80,963 46,23 38,10 224 670 1,13 2 3.1875 1.750 1.500 6 50 400 150 750 2.05 50,800 80,963 44,45 38,10 224 670 0,93 3.5625 2.070 1.687 8 63 000 191 250 3.50 90,488 52,58 42,85 280 850 1,60

1) To fully utilize the angle of tilt, the shaft shoulder should not be larger than d a max.

110

suffix for seal variants standard heavy-duty

– GEZ 008 ES

–

GEZ 010 ES GEZ 012 ES GEZ 014 ES GEZ 100 ES GEZ 104 ES GEZH 104 ES GEZ 106 ES GEZ 108 ES GEZH 108 ES GEZ 112 ES GEZH 112 ES GEZ 200 ES GEZH 200 ES

–

-2RS

–

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

rb ra

2.2

Dimensions d dk b b1 M

r11) min

r22) min

in/mm

Abutment and fillet dimensions da min

da max

Da min

Da sealed Da min max

ra max

rb max

in/mm

0.5 0.7190 0.102 0.098 0.059 0.006 0.024 0.54 0.57 0.68 – 0.78 0.006 12,700 18,263 2,6 2,5 1,5 0,2 0,6 13,7 14,5 17,3 – 19,9 0,2 0.625 0.8990 0.126 0.118 0.098 0.006 0.039 0.67 0.71 0.85 – 0.93 0.006 15,875 22,835 3,2 3 2,5 0,2 1 17 18,1 21,7 – 23,6 0,2 0.75 1.0800 0.126 0.118 0.098 0.012 0.039 0.82 0.86 1.03 1.1 1.11 0.012 19,050 27,432 3,2 3 2,5 0,3 1 20,9 21,8 26,1 27,9 28,3 0,3 0.875 1.2580 0.126 0.118 0.098 0.012 0.039 0.95 1 1.2 – 1.3 0.012 22,225 31,953 3,2 3 2,5 0,3 1 24,2 25,4 30,4 – 33 0,3 1 1.4370 0.126 0.118 0.098 0.012 0.039 1.08 1.14 1.37 1.39 1.48 0.012 25,400 36,500 3,2 3 2,5 0,3 1 27,5 29 34,7 35,2 37,7 0,3 1.25 1.7950 0.189 0.197 0.157 0.024 0.039 1.37 1.43 1.7 1.76 1.85 0.024 31,750 45,593 4,8 5 4 0,6 1 34,8 36,2 43,3 44,8 47 0,6 2.1550 0.189 0,197 0.157 0.039 0.039 1.43 1.65 2.05 2.06 2.28 0.039 54,737 4,8 5 4 1 1 36,2 41,8 52 52,3 58 1 1.375 1.9370 0.189 0.197 0.157 0.024 0.039 1.5 1.53 1.84 1.85 2.035 0.024 34,925 49,200 4,8 5 4 0,6 1 38,1 38,9 46,7 47,1 51,7 0,6 1.5 2.1550 0.189 0.197 0.157 0.024 0.039 1.63 1.71 2.05 2.06 2.28 0.024 38,100 54,737 4,8 5 4 0,6 1 41,4 43,4 52 52,3 58 0,6 2.5150 0.189 0.197 0.157 0.039 0.039 1.69 1.96 2.39 2.41 2.65 0.039 63,881 4,8 5 4 1 1 42,8 49,7 60,7 61,3 67,4 1 1.75 2.5150 0.189 0.197 0.157 0.024 0.039 1.91 2 2.39 2.41 2.65 0.024 44,450 63,881 4,8 5 4 0,6 1 48,5 50,7 60,7 61,3 67,4 0,6 2.8750 0.189 0.197 0.157 0.059 0.039 2.00 2.22 2.73 2.85 2.99 0.059 73,025 4,8 5 4 1,5 1 50,9 56,5 69,4 72,4 75,9 1,5 2 2.8750 0.189 0.197 0.157 0.024 0.039 2.17 2.28 2.73 2.85 2.99 0.024 50,800 73,025 4,8 5 4 0,6 1 55,1 57,9 69,4 72,4 75,9 0,6 3.2350 0.224 0.197 0.157 0.059 0.039 2.26 2.48 3.07 3.11 3.36 0.059 82,169 5,7 5 4 1,5 1 57,5 63,1 78,1 79 85,3 1,5

0.024 0,6 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1

1) Equal to maximum shaft fillet radius r a max. 2) Equal to maximum housing fillet radius r b max.

111

Radial spherical plain bearings, steel/steel, inch sizes d 2.25 – 4 in B C

r1 D dk

b1 d

GEZ .. ES

GEZ .. ES-2RS GEZ .. ES-2LS

GEZH .. ES

GEZH .. ES-2RS GEZH .. ES-2LS

Principal dimensions Angle Basic load ratings Mass Designations without seals of tilt1) dynamic static d D B C a C C0 in/mm

degrees lbf/kN

lb/kg

2.25 3.5625 1.969 1.687 6 63 000 191 250 2.85 57,150 90,488 50,01 42,85 280 850 1,30 3.9375 2.318 1.875 8 77 625 234 000 4.65 100,013 58,88 47,63 345 1 040 2,10 2.5 3.9375 2.187 1.875 6 77 630 234 000 4.10 63,500 100,013 55,55 47,63 345 1 040 1,85 4.3750 2.545 2.062 8 95 625 285 750 6.30 111,125 64,64 52,38 425 1 270 2,85 2.75 4.3750 2.406 2.062 6 95 630 285 750 5.30 69,850 111,125 61,11 52,38 425 1 270 2,40 4.7500 2.790 2.250 8 112 500 337 500 8.05 120,650 70,87 57,15 500 1 500 3,65 3 4.7500 2.625 2.250 6 112 500 337 500 6.85 76,200 120,650 66,68 57,15 500 1 500 3,10 5.1250 3.022 2.437 8 131 625 396 000 10.0 130,175 76,76 61,90 585 1 760 4,55 3.25 5.1250 2.844 2.437 6 131 630 396 000 8.40 82,550 130,175 72,24 61,90 585 1 760 3,80 5.5000 3.265 2.625 9 153 000 459 000 12.3 139,700 82,93 66,68 680 2 040 5,60 3.5 5.5000 3.062 2.625 6 153 000 459 000 10.5 88,900 139,700 77,78 66,68 680 2 040 4,80 5.8750 3.560 2.812 9 175 500 531 000 15.0 149,225 90,42 71,43 780 2 360 6,80 3.75 5.8750 3.281 2.812 6 175 500 531 000 13.0 95,250 149,225 83,34 71,43 780 2 360 5,80 6.2500 3.738 3.000 9 202 500 596 250 17.9 158,750 94,95 76,20 900 2 650 8,10 4 6.2500 3.500 3.000 6 202 500 596 250 15.5 101,600 158,750 88,90 76,20 900 2 650 7,00 7.0000 4.225 3.375 9 252 000 765 000 30.0 177,800 107,32 85,73 1 120 3 400 13,5 1) To fully utilize the angle of tilt, the shaft shoulder should not be larger than d a max.

112

suffix for seal variants standard heavy-duty

– GEZ 204 ES -2RS GEZH 204 ES -2RS GEZ 208 ES -2RS GEZH 208 ES -2RS GEZ 212 ES -2RS GEZH 212 ES -2RS GEZ 300 ES -2RS GEZH 300 ES -2RS GEZ 304 ES -2RS GEZH 304 ES -2RS GEZ 308 ES -2RS GEZH 308 ES -2RS GEZ 312 ES -2RS GEZH 312 ES -2RS GEZ 400 ES -2RS GEZH 400 ES -2RS

-2LS -2LS -2LS -2LS -2LS -2LS -2LS -2LS -2LS -2LS -2LS -2LS -2LS -2LS -2LS -2LS

rb ra

Dimensions d dk b b1 M

r11) min

r22 ) min

in/mm

2.2

Abutment and fillet dimensions da min

da max

Da min

Da sealed Da min max

ra max

rb max

in/mm

2.25 3.2350 0.224 0.197 0.157 0.024 0.039 2.43 2.57 3.07 3.11 3.36 0.024 57,150 82,169 5,7 5 4 0,6 1 61,7 65,2 78,1 79 85,3 0,6 3.5900 0.354 0.315 0.256 0.059 0.039 2.52 2.74 3.41 3.43 3.73 0.059 91,186 9 8 6,5 1,5 1 64,1 69,6 86,6 87 94,7 1,5 2.5 3.5900 0.354 0.315 0.256 0.024 0.039 2.69 2.85 3.41 3.43 3.73 0.024 63,500 91,186 9 8 6,5 0,6 1 68,3 72,3 86,6 87 94,7 0,6 3.9500 0.354 0.315 0.256 0.079 0.039 2.84 3.02 3.75 3.78 4.16 0.079 100,330 9 8 6,5 2 1 72 76,7 95,3 96 105,7 2 2.75 3.9500 0.354 0.315 0.256 0.024 0.039 2.95 3.13 3.75 3.78 4.16 0.024 69,850 100,330 9 8 6,5 0,6 1 74,9 79,6 95,3 96 105,7 0,6 4.3120 0.354 0.315 0.256 0.079 0.039 3.09 3.29 4.09 4.13 4.53 0.079 109,525 9 8 6,5 2 1 78,6 83,5 104 104,8 115 2 3 4.3120 0.354 0.315 0.256 0.024 0.039 3.2 3.42 4.09 4.13 4.53 0.024 76,200 109,525 9 8 6,5 0,6 1 81,4 86,9 104 104,8 115 0,6 4.6750 0.366 0.315 0.256 0.079 0.039 3.35 3.57 4.44 4.5 4.90 0.079 118,745 9,3 8 6,5 2 1 85,1 90,6 112,8 114,2 124,4 2 3.25 4.6750 0.366 0.315 0.256 0.024 0.039 3.46 3.71 4.44 4.5 4.9 0.024 82,550 118,745 9,3 8 6,5 0,6 1 88 94,2 112,8 114,2 124,4 0,6 5.0400 0.413 0.315 0.256 0.079 0.039 3.65 3.84 4.79 4.83 5.27 0.079 128,016 10,5 8 6,5 2 1 92,7 97,5 121,6 122,8 133,8 2 3.5 5.0400 0.413 0.315 0.256 0.024 0.039 3.72 4 4.79 4.83 5.27 0.024 88,900 128,016 10,5 8 6,5 0,6 1 94,6 101,7 121,6 122,8 133,8 0,6 5.3900 0.413 0.315 0.256 0.079 0.039 3.91 4.04 5.12 5.17 5.63 0.079 136,906 10,5 8 6,5 2 1 99,3 102,5 130,1 131,4 143,1 2 3.75 5.3900 0.413 0.315 0.256 0.024 0.039 3.98 4.28 5.12 5.17 5.63 0.024 95,250 136,906 10,5 8 6,5 0,6 1 101,2 108,6 130,1 131,4 143,1 0,6 5.7500 0.413 0.394 0.315 0.079 0.039 4.17 4.37 5.47 5.49 6.00 0.079 146,050 10,5 10 8 2 1 105,8 110,9 139 139,5 152,5 2 4 5.7500 0.413 0.394 0.315 0.024 0.039 4.25 4.55 5.47 5.49 6 0.024 101,600 146,050 10,5 10 8 0,6 1 108 115,5 139 139,5 152,5 0,6 6.4750 0.433 0.394 0.315 0.079 0.043 4.45 4.9 6.16 6.18 6.73 0.079 164,465 11 10 8 2 1,1 113 124,5 156,5 157 171 2

0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.043 1,1

1) Equal to maximum shaft fillet radius r a max. 2) Equal to maximum housing fillet radius r b max.

113

Radial spherical plain bearings, steel/steel, inch sizes d 4.5 – 6 in B C

r1 D dk

b1 d

GEZ .. ES

GEZ .. ES-2RS GEZ .. ES-2LS

GEZH .. ES

GEZH .. ES-2RS GEZH .. ES-2LS

Principal dimensions Angle Basic load ratings Mass Designations without seals of tilt1) dynamic static d D B C a C C0 in/mm

degrees lbf/kN

lb/kg

4.5 7.0000 3.937 3.375 6 252 000 765 000 21.5 114,300 177,800 100,00 85,73 1 120 3 400 9,80 7.7500 4.690 3.750 9 315 000 933 750 36.0 196,850 119,17 95,25 1 400 4 150 16,5 4.75 7.3750 4.156 3.562 6 281 250 843 750 25.5 120,650 187,325 105,56 90,48 1 250 3 750 11,5 5 7.7500 4.375 3.750 6 315 000 933 750 30.0 127,000 196,850 111,13 95,25 1 400 4 150 13,5 5.5 8.7500 4.950 4.125 7 389 250 1 170 000 45.5 139,700 222,250 125,73 104,78 1 730 5 200 20,5 6 8.7500 4.750 4.125 5 389 250 1 170 000 38.5 152,400 222,250 120,65 104,78 1 730 5 200 17,5

1) To fully utilize the angle of tilt, the shaft shoulder should not be larger than d a max.

114

suffix for seal variants standard heavy-duty

– GEZ 408 ES GEZH 408 ES GEZ 412 ES GEZ 500 ES GEZH 508 ES GEZ 600 ES

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

rb ra

Dimensions d dk b b1 M

r11) min

r22) min

in/mm

2.2

Abutment and fillet dimensions da min

da max

Da min

Da sealed Da min max

ra max

rb max

in/mm

4.5 6.4750 0.433 0.394 0.315 0.039 0.043 4.82 5.14 6.16 6.18 6.73 0.039 114,300 164,465 11 10 8 1 1,1 122,5 130,5 156,5 157 171 1 7.1900 0.433 0.394 0.315 0.079 0.043 4.96 5.45 6.83 6.91 7.42 0.079 182,626 11 10 8 2 1,1 126 138,4 173,5 175,5 188,5 2 4.75 6.8250 0.433 0.394 0.315 0.039 0.043 5.08 5.41 6.5 6.56 7.05 0.039 120,650 173,355 11 10 8 1 1,1 129 137,5 165 166,5 179 1 5 7.1900 0.433 0.394 0.315 0.039 0.043 5.33 5.69 6.83 6.91 7.42 0.039 127,000 182,626 11 10 8 1 1,1 135,5 144,5 173,5 175,5 188,5 1 5.5 8.1560 0.591 0.433 0.315 0.079 0.043 5.98 6.46 7.76 7.78 8.41 0.079 139,700 207,162 15 11 8 2 1,1 152 164 197 197,5 213,5 2 6 8.1560 0.591 0.433 0.315 0.039 0.043 6.34 6.61 7.76 7.78 8.41 0.039 152,400 207,162 15 11 8 1 1,1 161 168 197 197,5 213,5 1

0,043 1,1 0,043 1,1 0,043 1,1 0,043 1,1 0,043 1,1 0,043 1,1

1) Equal to maximum shaft fillet radius r a max. 2) Equal to maximum housing fillet radius r b max.

115

Radial spherical plain bearings with an extended inner ring, steel/steel, metric sizes d 12 – 125 mm B

r2 r1

D dk

GEG .. ES

GEM .. ES-2RS GEM .. ES-2LS

GEG .. ESA

Principal dimensions Angle Basic load ratings Mass of tilt dynamic static d D B C a C C0

Designations1) without seals suffix for with standard seals heavy-duty seals

–

degrees

10,8

0,020

GEG 12 ESA2)

–

17,6

0,035

GEG 16 ES

–

35 35

20 24

12 12

4 6

30 30

146 146

0,070 0,073

GEG 20 ES GEM 20 ES-2RS

– -2LS

42 42

25 29

16 16

4 4

48 48

240 240

0,13 0,13

GEG 25 ES GEM 25 ES-2RS

– -2LS

310

0,17

GEM 30 ES-2RS

-2LS

65,5

325

0,17

GEG 32 ES

–

400

0,25

GEM 35 ES-2RS

-2LS

62 62

38 40

22 22

4 4

100 100

500 500

0,35 0,34

GEM 40 ES-2RS GEG 40 ES

-2LS –

127

640

0,49

GEM 45 ES-2RS

-2LS

75 75

43 50

28 28

4 4

156 156

780 780

0,60 0,56

GEM 50 ES-2RS GEG 50 ES

-2LS –

245

1 220

1,15

GEM 60 ES-2RS

-2LS

255

1 270

1,25

GEG 63 ES

–

105

315

1 560

1,65

GEM 70 ES-2RS

-2LS

120 120

74 80

45 45

4 4

400 400

2 000 2 000

2,50 2,40

GEM 80 ES-2RS GEG 80 ES

-2LS –

100

150

100

610

3 050

4,80

GEG 100 ES

–

125

180

125

950

4 750

8,50

GEG 125 ES

–

1) Bearings with an outside diameter D ≥ 150 mm have the multi-groove system in the outer ring as standard. Bearings with an

outside diameter D < 150 mm can be supplied with the multi-groove system on request (designation suffix ESL).

2) Can only be relubricated via the outer ring.

116

rb ra

2.3

Dimensions

Abutment and fillet dimensions

d1 b b1 M d dk

da min

r1 min

r2 min

da max

Da min

Da max

ra max

rb max

15,5

2,3

â&#x20AC;&#x201C;

1,5

0,3

14,5

15,5

17,1

20,4

0,3

2,3

1,5

0,3

18,7

21,9

26,3

0,3

29 29

25 24

3,1 3,1

2 2

0,3 0,3

23,1 23

25 24

27,6 30,9

33,2 33,2

0,3 0,3

35,5 35,5

30,5 29

3,1 3,1

2 2

0,6 0,3

0,6 0,6

29,2 28,3

30,5 29

33,7 36,9

39,2 39,2

0,6 0,3

0,6 0,6

40,7

3,1

0,3

0,6

33,5

41,3

0,3

0,6

3,9

2,5

0,6

36,3

40,9

48,1

0,6

3,9

2,5

0,6

38,8

48,5

50,9

0,6

53 53

45 46

3,9 3,9

2,5 2,5

0,6 0,6

1 1

44 44,8

45 46

54,5 50,3

57,8 57,8

0,6 0,6

1 1

4,6

0,6

49,6

63,6

0,6

66 66

57 57

4,6 4,6

3 3

0,6 0,6

1 1

54,8 55,9

57 57

66,2 62,7

70,5 70,5

0,6 0,6

1 1

6,2

0,6

65,4

79,7

84,2

0,6

71,5

6,2

69,7

71,5

78,9

89,2

7,7

0,6

75,7

0,6

105 105

90 91

7,7 7,7

4 4

0,6 1

1 1

86,1 88,7

90 91

104,4 99,7

113,8 113,8

0,6 1

1 1

100

130

113

11,3

110,1

113

123,5

143,2

125

160

138

13,5

136,5

138

152

172

117

Radial spherical plain bearings with an extended inner ring, steel/steel, metric sizes d 160 – 200 mm B C r2 r1

D dk

GEG .. ES

Principal dimensions Angle Basic load ratings Mass of tilt dynamic static d D B C a C C0

Designation1) without seals

degrees

–

160

230

160

1 370

6 800

16,5

GEG 160 ES

200

290

200

100

2 120

10 600

32,0

GEG 200 ES

1) Bearings with an outside diameter D ≥ 150 mm have the multi-groove system in the outer ring as standard.

118

rb ra

2.3

Dimensions

Abutment and fillet dimensions

d1 b b1 M d dk

da min

r1 min

r2 min

da max

Da min

Da max

ra max

rb max

160

200

177

13,5

172

177

190

222

200

250

221

15,5

1,1

213

221

237,5

279,5

119

Radial spherical plain bearings with an extended inner ring, steel/steel, inch sizes d 0.5 – 2.5 in B

r2 r1

D dk

GEZM .. ES

GEZM .. ES-2RS

GEZM .. ES-2LS

Principal dimensions Angle of tilt1) Basic load ratings Mass Designations dynamic static without seals d D B C a a C C0 sealed in/mm

degrees

lbf/kN

lb/kg

0.5 0.8750 0.750 0.375 9 – 3 150 9 340 0.051 12,700 22,225 19,05 9,53 14 41,5 0,023 0.625 1.0625 0.937 0.469 9 – 4 840 14 738 0.090 15,875 26,988 23,80 11,91 21,5 65,5 0,041 0.75 1.2500 1.125 0.562 9 5 7 090 20 925 0.15 19,050 31,750 28,58 14,28 31,5 93 0,068 0.875 1.4375 1.312 0.656 9 – 9 560 28 575 0.23 22,225 36,513 33,33 16,66 42,5 127 0,11 1 1.6250 1.500 0.750 9 5 12 600 37 350 0.34 25,400 41,275 38,10 19,05 56 166 0,15 1.25 2.0000 1.875 0.937 9 5 19 460 58 500 0.63 31,750 50,800 47,63 23,80 86,5 260 0,29 1.375 2.1875 2.062 1.031 9 5 23 400 69 750 0.81 34,925 55,563 52,38 26,19 104 310 0,37 1.5 2.4375 2.250 1.125 9 5 28 130 84 380 1.15 38,100 61,913 57,15 28,58 125 375 0,51 1.75 2.8125 2.625 1.312 9 5 38 250 114 750 1.80 44,450 71,438 66,68 33,33 170 510 0,81 2 3.1875 3.000 1.500 9 5 50 400 150 750 2.65 50,800 80,963 76,20 38,10 224 670 1,20 2.25 3.5625 3.375 1.687 9 5 63 000 191 250 3.65 57,150 90,488 85,73 42,85 280 850 1,65 2.5 3.9375 3.750 1.875 9 5 77 625 234 000 4.95 63,500 100,013 95,25 47,63 350 1 040 2,25

1) To fully utilize the angle of tilt, the shaft shoulder should not be larger than d a max.

120

suffix for seal variants standard heavy-duty

– GEZM 008 ES GEZM 010 ES GEZM 012 ES GEZM 014 ES GEZM 100 ES GEZM 104 ES GEZM 106 ES GEZM 108 ES GEZM 112 ES GEZM 200 ES GEZM 204 ES GEZM 208 ES

–

-2RS

–

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

rb ra

2.4

Dimensions Abutment and fillet dimensions d1 b b1 M r11) r22) da da Da Da sealed Da ra d dk min min min max min min max max in/mm

rb max

in/mm

0.5 0.7190 0.625 0.102 0.098 0.059 0.012 0.024 0.56 0.63 0.68 – 0.78 0.012 12,700 18,263 15,9 2,6 2,5 1,5 0,3 0,6 14,3 15,9 17,3 – 19,9 0,3 0.625 0.8990 0.780 0.126 0.118 0.098 0.024 0.039 0.72 0.78 0.85 – 0.93 0.024 15,875 22,835 19,8 3,2 3 2,5 0,6 1,0 18,4 19,8 21,7 – 23,6 0,6 0.75 1.0800 0.920 0.126 0.118 0.098 0.024 0.039 0.85 0.92 1.03 1.1 1.11 0.024 19,050 27,432 23,4 3,2 3 2,5 0,6 1,0 21,7 23,4 26,1 27,9 28,3 0,6 0.875 1.2580 1.070 0.126 0.118 0.098 0.024 0.039 0.98 1.07 1.2 – 1.30 0.024 22,225 31,953 27,2 3,2 3 2,5 0,6 1,0 24,9 27,2 30,4 – 33 0,6 1 1.4370 1.220 0.126 0.118 0.098 0.024 0.039 1.11 1.22 1.37 1.39 1.48 0.024 25,400 36,500 31,0 3,2 3 2,5 0,6 1,0 28,2 31 34,7 35,2 37,7 0,6 1.25 1.7950 1.525 0.189 0.197 0.157 0.039 0.039 1.41 1.53 1.7 1.76 1.85 0.039 31,750 45,593 38,7 4,8 5 4 1,0 1,0 35,8 38,7 43,3 44,8 47 1 1.375 1.9370 1.670 0.189 0.197 0.157 0.039 0.039 1.54 1.67 1.84 1.85 2.04 0.039 34,925 49,200 42,4 4,8 5 4 1,0 1,0 39,1 42,4 46,7 47,1 51,7 1 1.5 2.1550 1.850 0.189 0.197 0.157 0.039 0.039 1.71 1.85 2.05 2.06 2.28 0.039 38,100 54,737 47,0 4,8 5 4 1,0 1,0 43,3 47 52 52,3 58 1 1.75 2.5150 2.165 0.189 0.197 0.157 0.039 0.039 1.97 2.17 2.39 2.41 2.65 0.039 44,450 63,881 55,0 4,8 5 4 1,0 1,0 49,9 55 60,7 61,3 67,4 1 2 2.8750 2.460 0.189 0.197 0.157 0.039 0.039 2.22 2.46 2.73 2.85 2.99 0.039 50,800 73,025 62,5 4,8 5 4 1,0 1,0 56,5 62,5 69,4 72,4 75,9 1 2.25 3.2350 2.760 0.224 0.197 0.157 0.039 0.039 2.48 2.76 3.07 3.11 3.36 0.039 57,150 82,169 70,1 5,7 5 4 1,0 1,0 63,1 70,1 78,1 79 85,3 1 2.5 3.5900 3.060 0.354 0.315 0.256 0.039 0.039 2.74 3.06 3.41 3.43 3.73 0.039 63,500 91,186 77,7 9 8 6,5 1,0 1,0 69,6 77,7 86,6 87 94,7 1

0.024 0,6 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1

1) Equal to maximum shaft fillet radius r a max. 2) Equal to maximum housing fillet radius r b max.

121

Radial spherical plain bearings with an extended inner ring, steel/steel, inch sizes d 2.75 – 6 in B

r2 r1

D dk

GEZM .. ES

GEZM .. ES-2RS

GEZM .. ES-2LS

Principal dimensions Angle of tilt1) Basic load ratings Mass Designations dynamic static without seals d D B C a a C C0 sealed in/mm

degrees

lbf/kN

lb/kg

2.75 4.3750 4.125 2.062 9 5 95 625 285 750 6.85 69,850 111,125 104,78 52,38 430 1 270 3,10 3 4.7500 4.500 2.250 9 5 112 500 337 500 8.80 76,200 120,650 114,30 57,15 500 1 500 4,00 3.25 5.1250 4.875 2.437 9 5 131 625 396 000 11.0 82,550 130,175 123,83 61,90 590 1 760 5,00 3.5 5.5000 5.250 2.625 9 5 153 000 459 000 14.0 88,900 139,700 133,35 66,68 680 2 040 6,25 3.75 5.8750 5.625 2.812 9 5 175 500 531 000 17.0 95,250 149,225 142,88 71,43 780 2 360 7,60 4 6.2500 6.000 3.000 9 5 202 500 596 250 20.0 101,600 158,750 152,40 76,20 900 2 650 9,10 4.5 7.0000 6.750 3.375 7 5 252 000 765 000 28.5 114,300 177,800 171,45 85,73 1 120 3 400 13,0 5 7.7500 7.500 3.750 7 5 315 000 933 750 38.5 127,000 196,850 190,50 95,25 1 400 4 150 17,5 6 8.7500 8.250 4.125 7 5 389 250 1 170 000 47.5 152,400 222,250 209,55 104,78 1 730 5 200 21,5

1) To fully utilize the angle of tilt, the shaft shoulder should not be larger than d a max.

122

suffix for seal variants standard heavy-duty

– GEZM 212 ES -2RS -2LS GEZM 300 ES GEZM 304 ES GEZM 308 ES GEZM 312 ES GEZM 400 ES GEZM 408 ES GEZM 500 ES GEZM 600 ES

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

-2RS

-2LS

rb ra

2.4

Dimensions Abutment and fillet dimensions d1 b b1 M r11) r22) da da Da Da sealed Da ra rb d dk min min min max min min max max max in/mm

in/mm

2.75 3.9500 3.380 0.354 0.315 0.256 0.039 0.039 3.00 3.38 3.75 3.78 4.16 0.039 69,850 100,330 85,9 9 8 6,5 1,0 1,0 76,2 85,9 95,3 96 105,7 1 3 4.3120 3.675 0.354 0.315 0.256 0.039 0.039 3.26 3.68 4.09 4.13 4.53 0.039 76,200 109,525 93,3 9 8 6,5 1,0 1,0 82,8 93,3 104 104,8 115 1 3.25 4.6750 3.985 0.366 0.315 0.256 0.039 0.039 3.52 3.99 4.44 4.5 4.90 0.039 82,550 118,745 101,2 9,3 8 6,5 1,0 1,0 89,4 101,2 112,8 114,2 124,4 1 3.5 5.0400 4.300 0.413 0.315 0.256 0.039 0.039 3.78 4.3 4.79 4.83 5.27 0.039 88,900 128,016 109,2 10,5 8 6,5 1,0 1,0 95,9 109,2 121,6 122,8 133,8 1 3.75 5.3900 4.590 0.413 0.315 0.256 0.039 0.039 4.04 4.59 5.12 5.17 5.63 0.039 95,250 136,906 116,6 10,5 8 6,5 1,0 1,0 102,5 116,6 130,1 131,4 143,1 1 4 5.7500 4.905 0.413 0.394 0.315 0.059 0.039 4.33 4.91 5.47 5.49 6.00 0.059 101,600 146,050 124,6 10,5 10 8 1,5 1,0 110 124,6 139 139,5 152,5 1,5 4.5 6.4750 5.525 0.433 0.394 0.315 0.079 0.043 4.94 5.53 6.16 6.18 6.73 0.079 114,300 164,465 140,3 11 10 8 2,0 1,1 125,5 140,3 156,5 157 171 2 5 7.1900 6.130 0.433 0.394 0.315 0.079 0.043 5.45 6.13 6.83 6.91 7.42 0.079 127,000 182,626 155,7 11 10 8 2,0 1,1 138,5 155,7 173,5 175,5 188,5 2 6 8.1560 7.020 0.591 0.433 0.315 0.079 0.043 6.46 7.02 7.76 7.78 8.41 0.079 152,400 207,162 178,3 15 11 8 2,0 1,1 164 178,3 197 197,5 213,5 2

0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.043 1,1 0.043 1,1 0.043 1,1

1) Equal to maximum shaft fillet radius r a max. 2) Equal to maximum housing fillet radius r b max.

123

Maintenance-free radial spherical plain bearings Dimensions...................................................................................................................................... Tolerances........................................................................................................................................ Radial internal clearance, preload.................................................................................................. Materials.......................................................................................................................................... Permissible operating temperature range.....................................................................................

126 126 130 130 130

Product tables......................................................................................................... 3.1 Maintenance-free radial spherical plain bearings, steel/PTFE sintered bronze, metric sizes.............................................................................................................................. 3.2 Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes............. 3.3 Maintenance-free radial spherical plain bearings, steel/PTFE fabric, inch sizes................. 3.4 Maintenance-free radial spherical plain bearings, steel/PTFE FRP, metric sizes................

132 132 134 140 144

125

Maintenance-free radial spherical plain bearings SKF manufactures maintenance-free radial spherical plain bearings in a variety of designs and a wide range of sizes. Three sliding contact surface combinations are available: • Steel/PTFE sintered bronze, designation suffix C • Steel/PTFE fabric, designation suffix TX • Steel/PTFE FRP, designation suffix F All three sliding contact surface combinations are self-lubricating. Bearings with a steel/PTFE sintered bronze or steel/PTFE fabric sliding contact surface combinations must not be lubricated. Bearings with a steel/PTFE FRP (fibre reinforced polymer) sliding contact surface combination are also maintenance-free; however, occasional relubrication is beneficial to help maximize bearing service life. To facilitate relubrication, steel/PTFE FRP bearings are equipped with lubrication facilities. The different designs of SKF maintenancefree radial spherical plain bearings are listed in table 3 on pages 128 to 129. Their design depends on the size and series, with the main differences being the material or the design of the outer ring.

Dimensions The dimensions of metric maintenance-free radial spherical plain bearings are in accordance with ISO 12240-1:1998. The dimensions of inch bearings in the GEZ series are in accordance with ANSI/ABMA Std. 22.2-1988.

126

Tolerances The dimensional tolerances for metric mainten ance-free radial spherical plain bearings are in accordance with ISO 12240-1:1998 and listed in table 1. The dimensional tolerances for inch bearings in the GEZ series are in accordance with ANSI/ ABMA Std. 22.2-1988 and listed in table 2. The symbols used are explained in the following: d nominal bore diameter Ddmp deviation of the mean bore diameter from the nominal D nominal outside diameter DDmp deviation of the mean outside diameter from the nominal DBs deviation of the single inner ring width from the nominal DCs deviation of the single outer ring width from the nominal For the TX and TXG3 designs, outer ring tolerances apply to dimensions before fracture.

Table 1 Dimensional tolerances for metric maintenance-free radial spherical plain bearings Nominal diameter d, D over incl.

Inner ring Ddmp DBs high low high low

Outer ring DDmp high low

DCs high low

µm

– 18 30

18 30 50

0 0 0

–8 –10 –12

0 0 0

–120 –120 –120

0 0 0

–8 –9 –11

0 0 0

–240 –240 –240

50 80 120

80 120 150

0 0 0

–15 –20 –25

0 0 0

–150 –200 –250

0 0 0

–13 –15 –18

0 0 0

–300 –400 –500

150 180 250

180 250 315

0 0 0

–25 –30 –35

0 0 0

–250 –300 –350

0 0 0

–25 –30 –35

0 0 0

–500 –600 –700

315 400 500

400 500 630

0 0 0

–40 –45 –50

0 0 0

–400 –450 –500

0 0 0

–40 –45 –50

0 0 0

–800 –900 –1 000

630 800 1 000

800 1 000 1 250

0 0 0

–75 –100 –125

0 0 0

–750 –1 000 –1 250

0 0 0

–75 –100 –125

0 0 0

–1 100 –1 200 –1 300

1 250 1 600

1 600 2 000

– –

0 0

–160 –200

0 0

–1 600 –2 000

Table 2 Dimensional tolerances for inch maintenance-free radial spherical plain bearings Nominal diameter d, D over incl.

Inner ring Ddmp DBs high low high low

Outer ring DDmp high low

DCs high low

µm

–

–13

–130

–13

–130

–15

–130

–15

–130

3.1875

–20

–130

–15

–130

3.1875 4.75

–20

–130

–20

–130

4.75

–25

–130

–25

–130

–

–25

–130

8.75

–

–30

–130

127

Maintenance-free radial spherical plain bearings Table 3 Design of maintenance-free radial spherical plain bearings Sliding contact surface combination

Steel/PTFE sintered bronze

Steel/PTFE fabric

1 2

Lining

Inner ring

Outer ring

Steel/PTFE FRP

1 PTFE 2 Tin bronze 3 Sheet steel backing

1 2 3 4

C and CJ2 designs Bearing steel, throughhardened and ground, sliding surface hard chromium plated

TXA and TXE designs Bearing steel, through-hardened and ground, sliding surface hard chromium plated

C design Steel backing with PTFE sintered bronze layer pressed around the inner ring, with a butt joint

TXA and TXE designs Bearing steel, through-hardened and ground TXA: axially split, held together by one or two bands or bolted together TXE: fractured at one point

CJ2 design Steel backing with PTFE sintered bronze sleeve pressed around the inner ring, without a butt joint

PTFE fibres Reinforcement fibres Resin Steel backing

3 1 Fibres 2 Polymer and PTFE 3 Steel backing

Series GEP and GEC Bearing steel, through-hardened, ground, sliding surface hard chromium plated

TXGR, TXG3E and TXG3A designs Stainless steel X 46 Cr 13/1.4034, hardened, ground

TXG3A and TXG3E design Stainless steel X 46 Cr 13/1.4034, hardened, ground, TXG3A: axially split, held together by one or two bands TXG3E: fractured at one point TXGR design Unhardened stainless steel X 17 CrNi 16-2 or equivalent, pressed around the inner ring, no butt joint

128

2 3

Series GEP and GEC Hardenable steel, ground, FRP shells are retained by side flanges and also glued to the outer ring Series GEP: radially split, separable Series GEC: axially split, held together by two bands (d â&#x2030;¤ 400 mm) or bolted together (d > 400 mm)

Table 3 Design of maintenance-free radial spherical plain bearings Sliding contact surface combination

Steel/PTFE sintered bronze

Steel/PTFE fabric

Steel/PTFE FRP

Seals

Available on request

Bearings with designation suffix -2RS or -2LS (depending on bearing size) have a doubleor triple-lip seal on both sides († page 79)

None

RS design

LS design

3 Permissible operating temperature range

–50 to +150 °C, for short periods up to +280 °C

°C

Bearings without seals: –50 to +150 °C Bearings with RS seals: with a bore diameter d < 320 mm: –30 to +130 °C with a bore diameter d ≥ 320 mm: –35 to +100 °C

–40 to +75 °C, for short periods up to +110 °C

Bearings with LS seals: –50 to +110 °C

Lubrication (refer to the section Lubrication, starting on page 84)

Reduced carrying capacity above 80 °C

Reduced carrying capacity above 65 °C for both sealed and unsealed bearings

Reduced carrying capacity above 50 °C

Self-lubricating; the bearings must not be lubricated

Greased before leaving factory, self-lubricating capability, however occasional relubrication extends service life

129

Maintenance-free radial spherical plain bearings

Radial internal clearance, preload

Materials

Maintenance-free radial spherical plain bearings with a bore diameter d ≤ 90 mm either have an internal clearance or a slight preload (negative clearance) depending on their design. Therefore, these bearings can only be provided with an upper limit for bearing internal clearance. The lower limit must be assessed by the frictional moment, resulting from the preload (negative clearance). The radial internal clearance and the upper limit of the permissible frictional moment of bearings with a steel/PTFE sintered bronze sliding contact surface are listed in table 4. The values for the clearance limits of bearings with a steel/PTFE fabric and a steel/PTFE FRP sliding contact surface combination are listed in tables 5 to 8.

The materials for the inner ring, outer ring, sliding layer and seals, where applicable, are listed in table 3 on pages 128 to 129.

Permissible operating temperature range The permissible operating temperature range of maintenance-free radial spherical plain bearings depends on the sliding contact surface combination and the material of the seals († table 3 on pages 128 to 129). However, if the load carrying capacity of the bearings is to be fully exploited, the temperature range must be narrowed. Depending on the application, it is possible to operate at temperatures above the upper limit for brief periods. For additional information, contact the SKF application engineering service.

Table 4

Table 5

Radial internal clearance and frictional moment of steel/PTFE sintered bronze bearings, metric sizes

Radial internal clearance for steel/PTFE fabric bearings, metric sizes

Nominal diameter d over incl.

Radial internal clearance max

Frictional moment max

Nominal diameter d over incl.

Radial internal clearance min max

µm

Series GE .. C, CJ2 2,5 12 20

12 20 30

28 35 44

0,15 0,25 0,40

0,75

28 35 44

0,15 0,25 0,40

Series GEH .. C 2,5 10 17

10 17 25

Series GE .. TXA, TXE, TXGR, TXG3A, TXG3E GEH1).. TXA, TXE, TXG3A, TXG3E GEC .. TXA 12 20

12 20 30

– – –

50 50 50

30 60 90

60 90 140

– – 50

50 50 130

140 180 300

180 300 460

50 80 100

140 190 230

460 530 670

530 670 800

100 100 100

245 260 270

1) Bearings in the GEH .. TX.. series with a bore diameter

d = 90 mm have a radial clearance corresponding to the values quoted for the next larger diameter.

130

Table 6 Radial internal clearance for steel/PTFE fabric bearings, inch sizes Nominal diameter d over incl.

Radial internal clearance min max

µm

Series GEZ .. TXE, TXA – 3 4.75

3 4.75

– 50 50

50 130 140

Table 7

Table 8

Radial internal clearance for steel/PTFE FRP bearings, metric sizes

Bore diameter d over incl.

Radial internal clearance min max

Nominal diameter d over incl.

Radial internal clearance min max

µm

Series GEP .. FS

Series GEC .. FBAS

90 120 180

120 180 220

85 100 100

285 335 355

220 240 280

240 280 300

110 110 135

365 380 415

300 380 400

380 400 480

135 135 145

490 510 550

480 500 600

500 600 630

145 160 160

570 610 640

630 750 800

750 800 950

170 170 195

670 700 770

950

1 000

195

820

300 340 400 500 530 630 670 800 850

340 135 400 135 500 145 530 160 630 160 670 170 800 170 850 195 1 000 195

350 360 390 420 440 460 490 530 560

131

Maintenance-free radial spherical plain bearings, steel/PTFE sintered bronze, metric sizes d 4 – 60 mm B C

a r2 r1

D dk

GE .. C

GE .. CJ2

GEH .. C

Principal dimensions Angle Basic load ratings Mass Designation dynamic static of tilt1) d D B C a C C0 mm

degrees

–

2,16

5,4

0,003

GE 4 C

3,6

0,004

GE 6 C

5,85

14,6

0,008

GE 8 C

19 22

9 12

6 7

12 18

8,65 11,4

21,6 28,5

0,012 0,020

GE 10 C GEH 10 C

22 26

10 15

7 9

10 18

11,4 18

28,5 45

0,017 0,030

GE 12 C GEH 12 C

26 30

12 16

9 10

8 16

18 22,4

45 56

0,032 0,050

GE 15 C GEH 15 C

30 35

14 20

10 12

10 19

22,4 31,5

56 78

0,050 0,090

GE 17 C GEH 17 C

35 42

16 25

12 16

9 17

31,5 51

78 127

0,065 0,16

GE 20 C GEH 20 C

42 47

20 28

16 18

7 17

51 65,5

127 166

0,12 0,20

GE 25 C GEH 25 C

65,5

166

0,16

GE 30 C

200

0,23

GE 35 CJ2

100

250

0,32

GE 40 CJ2

127

320

0,46

GE 45 CJ2

156

390

0,56

GE 50 CJ2

245

610

1,10

GE 60 CJ2

1) To fully utilize the angle of tilt, the shaft shoulder should not be larger than d a max.

132

rb ra

3.1

Dimensions

Abutment and fillet dimensions

d dk

da min

r1 min

r2 min

da max

Da min

Da max

ra max

rb max

0,3

5,4

6,2

7,6

10,7

0,3

7,4

9,5

12,7

0,3

9,4

10,2

12,3

14,6

0,3

16 18

0,3 0,3

11,5 11,6

13,2 13,4

15,2 17,1

17,6 20,6

0,3 0,3

18 22

0,3 0,3

13,5 13,7

15 16,1

17,1 20,9

20,6 24,5

0,3 0,3

22 25

0,3 0,3

16,6 16,7

18,4 19,2

20,9 23,7

24,5 28,5

0,3 0,3

25 29

0,3 0,3

18,7 18,9

20,7 21

23,7 27,6

28,5 33,4

0,3 0,3

29 35,5

0,3 0,3

0,3 0,6

21,8 22,1

24,2 25,2

27,6 33,7

33,4 39,5

0,3 0,3

0,3 0,6

35,5 40,7

0,6 0,6

27,7 27,9

29,3 29,5

33,7 38,7

39,5 44,4

0,6 0,6

40,7

0,6

32,8

34,2

38,7

44,4

0,6

37,9

39,8

44,7

51,4

0,6

42,9

50,4

58,3

0,6

48,7

50,8

64,2

0,6

53,9

62,7

71,1

0,6

65,4

66,8

85,8

133

Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes d 12 – 90 mm

B C

D dk

GE .. TXGR

GE .. TX(G3)E-2LS

GE .. TX(G3)A-2LS

Principal dimensions Angle Basic load ratings Mass Designations dynamic static Material of tilt1) Bearing steel Stainless steel d D B C a C C0 mm

degrees

–

0,017

–

GE 12 TXGR

47,5

0,032

–

GE 15 TXGR

100

0,050

–

GE 17 TXGR

35 42

16 25

12 16

9 17

83 137

140 228

0,065 0,15

GE 20 TXE-2LS GEH 20 TXE-2LS

GE 20 TXG3E-2LS GEH 20 TXG3E-2LS

42 47

20 28

16 18

7 17

137 176

228 290

0,12 0,19

GE 25 TXE-2LS GEH 25 TXE-2LS

GE 25 TXG3E-2LS GEH 25 TXG3E-2LS

47 55

22 32

18 20

6 17

176 224

290 375

0,16 0,29

GE 30 TXE-2LS GEH 30 TXE-2LS

GE 30 TXG3E-2LS GEH 30 TXG3E-2LS

55 62

25 35

20 22

6 15

224 280

375 465

0,23 0,39

GE 35 TXE-2LS GEH 35 TXE-2LS

GE 35 TXG3E-2LS GEH 35 TXG3E-2LS

62 68

28 40

22 25

6 17

280 360

465 600

0,32 0,52

GE 40 TXE-2LS GEH 40 TXE-2LS

GE 40 TXG3E-2LS GEH 40 TXG3E-2LS

68 75

32 43

25 28

7 14

360 440

600 735

0,46 0,69

GE 45 TXE-2LS GEH 45 TXE-2LS

GE 45 TXG3E-2LS GEH 45 TXG3E-2LS

75 90

35 56

28 36

6 17

440 695

735 1 160

0,56 1,41

GE 50 TXE-2LS GEH 50 TXE-2LS

GE 50 TXG3E-2LS GEH 50 TXG3E-2LS

90 105

44 63

36 40

6 17

695 880

1 160 1 460

1,10 2,06

GE 60 TXE-2LS GEH 60 TXE-2LS

GE 60 TXG3E-2LS GEH 60 TXG3A-2LS

105 120

49 70

40 45

6 16

880 1 140

1 460 1 900

1,55 2,99

GE 70 TXE-2LS GEH 70 TXE-2LS

GE 70 TXG3A-2LS GEH 70 TXG3A-2LS

120 130

55 75

45 50

5 14

1 140 1 370

1 900 2 320

2,30 3,55

GE 80 TXE-2LS GEH 80 TXE-2LS

GE 80 TXG3A-2LS GEH 80 TXG3A-2LS

130 150

60 85

50 55

5 15

1 370 1 730

2 320 2 850

2,75 5,40

GE 90 TXE-2LS GEH 90 TXA-2LS

GE 90 TXG3A-2LS GEH 90 TXG3A-2LS

1) To fully utilize the angle of tilt, the shaft shoulder should not be larger than d a max.

134

rb ra

3.2 GEH .. TX(G3)E-2LS

GEH .. TX(G3)A-2LS

Dimensions

Abutment and fillet dimensions

d dk

da min

r1 min

r2 min

da max

Da min

Da max

ra max

rb max

0,3

13,8

17,1

20,4

0,3

16,9

18,4

20,9

24,3

0,3

20,7

23,7

28,3

0,3

29 35,5

0,3 0,3

0,3 0,6

22,1 22,9

24,2 25,2

27,6 36,9

33,2 39,2

0,3 0,3

0,3 0,6

35,5 40,7

0,6 0,6

28,2 28,7

29,3 29,5

36,9 41,3

39,2 44

0,6 0,6

40,7 47

0,6 0,6

0,6 1

33,3 33,8

34,2 34,4

41,3 48,5

44 51

0,6 0,6

0,6 1

47 53

0,6 0,6

1 1

38,5 39

39,8 39,7

48,5 54,5

51 57,5

0,6 0,6

1 1

53 60

0,6 0,6

1 1

43,5 44,2

45 44,7

54,5 61

57,5 63,5

0,6 0,6

1 1

60 66

0,6 0,6

1 1

49,5 50

50,8 50

61 66,5

63,5 70,5

0,6 0,6

1 1

66 80

0,6 0,6

1 1

54,5 56

56 57,1

66,5 80

70,5 84

0,6 0,6

1 1

80 92

1 1

66,5 67

66,8 67

80 92

84 99

1 1

92 105

1 1

76,5 77,8

77,9 78,2

92 105

99 113

1 1

105 115

1 1

87 87,1

89,4 87,1

105 113

113 123

1 1

115 130

1 1

97,5 98,3

98,1 98,3

113 131

123 144

1 1

135

Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes d 100 – 300 mm B

C r2 r1

D dk

GE .. TX(G3)A-2LS

GEH .. TX(G3)A-2LS

Principal dimensions Angle Basic load ratings Mass Designations dynamic static Material of tilt1) Bearing steel Stainless steel d D B C a C C0 mm

degrees

–

100

150 160

70 85

55 55

6 13

1 730 1 860

2 850 3 100

4,40 5,90

GE 100 TXA-2LS GEH 100 TXA-2LS

GE 100 TXG3A-2LS GEH 100 TXG3A-2LS

110

160 180

70 100

55 70

6 12

1 860 2 700

3 100 4 500

4,80 9,50

GE 110 TXA-2LS GEH 110 TXA-2LS

GE 110 TXG3A-2LS GEH 110 TXG3A-2LS

120

180 210

85 115

70 70

6 16

2 700 3 000

4 500 5 000

8,25 14,90

GE 120 TXA-2LS GEH 120 TXA-2LS

GE 120 TXG3A-2LS GEH 120 TXG3A-2LS

140

210

3 000

5 000

11,0

GE 140 TXA-2LS

GE 140 TXG3A-2LS

160

230

105

3 800

6 400

14,0

GE 160 TXA-2LS

GE 160 TXG3A-2LS

180

260

105

4 300

7 200

18,5

GE 180 TXA-2LS

GE 180 TXG3A-2LS

200

290

130

100

6 000

10 000

28,0

GE 200 TXA-2LS

GE 200 TXG3A-2LS

220

320

135

100

6 550

11 000

35,5

GE 220 TXA-2LS

–

240

340

140

100

7 200

12 000

40,0

GE 240 TXA-2LS

–

260

370

150

110

8 650

14 300

51,5

GE 260 TXA-2LS

–

280

400

155

120

10 000

16 600

65,0

GE 280 TXA-2LS

–

300

430

165

120

10 800

18 000

78,5

GE 300 TXA-2LS

–

1) To fully utilize the angle of tilt, the shaft shoulder should not be larger than d a max.

136

rb ra

3.2

Dimensions

Abutment and fillet dimensions

d dk

da min

r1 min

r2 min

da max

Da min

Da max

ra max

rb max

100

130 140

1 1

108 108,5

109,5 111,2

131 141,5

144 153

1 1

110

140 160

1 1

118 120

121 124,5

141,5 157,5

153 172

1 1

120

160 180

1 1

130 130,5

135,5 138

157,5 180

172 202

1 1

140

180

149

155,5

180

202

160

200

170

197

222

180

225

1,1

191

199

224,5

250

200

250

1,1

213

213,5

244,5

279

220

275

1,1

233

239,5

271

309

240

300

1,1

253

265

298

329

260

325

1,1

273

288

321,5

359

280

350

1,1

294

313,5

344,5

388

300

375

1,1

314

336,5

371

418

137

Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes d 320 – 800 mm

B C

D dk

GEC .. TXA-2RS d ≤ 400 mm

GEC .. TXA-2RS d ≥ 420 mm

Principal dimensions Angle Basic load ratings Mass Designation dynamic static of tilt1) d D B C a C C0 mm

degrees

–

320

440

160

135

14 000

23 200

GEC 320 TXA-2RS

340

460

160

135

14 600

24 500

82,5

GEC 340 TXA-2RS

360

480

160

135

15 300

25 500

GEC 360 TXA-2RS

380

520

190

160

19 300

32 500

125

GEC 380 TXA-2RS

400

540

190

160

20 400

34 000

130

GEC 400 TXA-2RS

420

560

190

160

21 200

35 500

140

GEC 420 TXA-2RS

440

600

218

185

26 000

43 000

195

GEC 440 TXA-2RS

460

620

218

185

27 000

45 000

200

GEC 460 TXA-2RS

480

650

230

195

30 000

50 000

235

GEC 480 TXA-2RS

500

670

230

195

31 000

51 000

245

GEC 500 TXA-2RS

530

710

243

205

34 500

57 000

290

GEC 530 TXA-2RS

560

750

258

215

38 000

63 000

340

GEC 560 TXA-2RS

600

800

272

230

43 000

72 000

405

GEC 600 TXA-2RS

630

850

300

260

52 000

86 500

525

GEC 630 TXA-2RS

670

900

308

260

55 000

91 500

590

GEC 670 TXA-2RS

710

950

325

275

62 000

102 000

685

GEC 710 TXA-2RS

750

1 000 335

280

65 500

110 000

770

GEC 750 TXA-2RS

800

1 060 355

300

75 000

125 000

910

GEC 800 TXA-2RS

1) To fully utilize the angle of tilt, the shaft shoulder should not be larger than d a max.

138

rb ra

3.2

Dimensions

Abutment and fillet dimensions

d dk

da min

r1 min

r2 min

da max

Da min

Da max

ra max

rb max

320

380

1,1

337

344

376

414

340

400

1,1

357

366

396

434

360

420

1,1

376

388

416

454

380

450

1,5

400

407

445

490

1,5

400

470

1,5

420

429

465

510

1,5

420

490

1,5

439

451

485

530

1,5

440

520

1,5

461

472

514

568

1,5

460

540

1,5

482

494

534

587

1,5

480

565

504

516

559

613

500

585

524

537

579

633

530

620

555

570

613

672

560

655

585

602

648

711

600

700

627

644

692

760

630

740

662

676

732

802

670

785

702

722

776

853

710

830

744

763

821

901

750

875

784

808

865

950

800

930

835

859

920

1008

139

Maintenance-free radial spherical plain bearings, steel/PTFE fabric, inch sizes d 1 – 3.75 in B

C r2 r1

D dk

GEZ .. TXE-2LS

Principal dimensions

Angle of tilt

Basic load ratings dynamic static

degrees

lbf/kN

in/mm

Mass

Designation

C0 lb/kg

–

1 1.6250 0.875 0.750 6 18 680 37 350 0.26 25,400 41,275 22,23 19,05 83 166 0,12 1.25 2.0000 1.093 0.937 6 29 030 58 500 0.51 31,750 50,800 27,76 23,80 129 260 0,23 1.375 2.1875 1.187 1.031 5 35 100 69 750 0.77 34,925 55,563 30,15 26,19 156 310 0,35 1.5 2.4375 1.312 1.125 6 41 850 84 380 0.93 38,100 61,913 33,33 28,58 186 375 0,42 1.75 2.8125 1.531 1.312 6 57 380 114 750 1.40 44,450 71,438 38,89 33,33 255 510 0,64 2 3.1875 1.750 1.500 6 75 380 150 750 2.05 50,800 80,963 44,45 38,10 335 670 0,93 2.25 3.5625 1.969 1.687 6 95 630 191 250 2.85 57,150 90,488 50,01 42,85 425 850 1,30 2.5 3.9375 2.187 1.875 6 117 000 234 000 4.10 63,500 100,013 55,55 47,63 520 1 040 1,85 2.75 4.3750 2.406 2.062 6 141 750 285 750 5.30 69,850 111,125 61,11 52,38 630 1 270 2,40

GEZ 100 TXE-2LS

3 4.75 2.625 2.25 6 168 750 337 500 6.84 76,200 120,650 66,68 57,15 750 1500 3,1 3.25 5.125 2.844 2.437 6 198 000 396 000 8.38 82,550 130,175 72,24 61,9 880 1760 3,8 3.5 5.5 3.062 2.625 6 229 500 459 000 10.58 88,900 139,700 77,78 66,68 1020 2040 4,8 3.75 5.875 3.281 2.812 6 265 500 531 000 12.79 95,250 149,225 83,34 71,43 1180 2360 5,8

GEZ 300 TXE-2LS

140

GEZ 104 TXE-2LS GEZ 106 TXE-2LS GEZ 108 TXE-2LS GEZ 112 TXE-2LS GEZ 200 TXE-2LS GEZ 204 TXE-2LS GEZ 208 TXE-2LS GEZ 212 TXE-2LS

GEZ 304 TXE-2LS GEZ 308 TXE-2LS GEZ 312 TXE-2LS

rb ra

3.3

Dimensions

Abutment and fillet dimensions

d dk

da min

r1 min

r2 min

in/mm

da max

Da min

Da max

ra max

rb max

in/mm

1 1.4370 0.012 0.039 1.09 1.14 1.45 1.46 0.012 25,400 36,500 0,3 1 27,6 28,9 36,8 37,1 0,3 1.25 1.7950 0.024 0.039 1.38 1.42 1.81 1.83 0.024 31,750 45,593 0,6 1 35 36,1 45,9 46,4 0,6 1.375 1.9370 0.024 0.039 1.51 1.53 1.93 2.01 0.024 34,925 49,200 0,6 1 38,3 38,8 49 51 0,6 1.5 2.1550 0.024 0.039 1.64 1.71 2.17 2.25 0.024 38,100 54,737 0,6 1 41,6 43,4 55,1 57,2 0,6 1.75 2.5150 0.024 0.039 1.92 1.99 2.52 2.62 0.024 44,450 63,881 0,6 1 48,8 50,6 64,1 66,5 0,6 2 2.8750 0.024 0.039 2.18 2.28 2.85 2.95 0.024 50,800 73,025 0,6 1 55,4 57,9 72,4 74,9 0,6 2.25 3.2350 0.024 0.039 2.44 2.56 3.22 3.31 0.024 57,150 82,169 0,6 1 62 65,1 81,9 84,1 0,6 2.5 3.5900 0.024 0.039 2.7 2.85 3.56 3.68 0.024 63,500 91,186 0,6 1 68,6 72,3 90,4 93,4 0,6 2.75 3.9500 0.024 0.039 2.96 3.13 3.95 4.1 0.024 69,850 100,330 0,6 1 75,2 79,5 100,4 104,2 0,6 3 4.3120 0.024 0.039 3.220 3.417 4.299 4.469 0.024 76,200 109,525 0,6 1 81,8 86,8 109,2 113,5 0,6 3.25 4.675 0.024 0.039 3.480 3.709 4.677 4.831 0.024 82,550 118,745 0,6 1 88,4 94,2 118,8 122,7 0,6 3.5 5.04 0.024 0.039 3.740 4.000 5.024 5.197 0.024 88,900 128,016 0,6 1 95 101,6 127,6 132 0,6 3.75 5.39 0.024 0.039 4.000 4.276 5.362 5.559 0.024 95,250 136,906 0,6 1 101,6 108,6 136,2 141,2 0,6

0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1 0.039 1

141

Maintenance-free radial spherical plain bearings, steel/PTFE fabric, inch sizes d 4 – 6 in B

C r2 r1

D dk

GEZ .. TXA-2LS

Principal dimensions

Angle of tilt

Basic load ratings dynamic static

degrees

lbf/kN

in/mm

Mass

C0 lb/kg

4 6.25 3.5 3 6 301 500 596 250 15.435 101,600 158,750 88,9 76,2 1340 2650 7 4.5 7 3.937 3.375 6 382 500 765 000 21.609 114,300 177,800 100 85,725 1700 3400 9,8 4.75 7.375 4.156 3.562 6 427 500 843 750 25.358 120,650 187,325 105,56 90,48 1900 3750 11,5 5 7.75 4.375 3.75 6 468 000 933 750 29.768 127 196,850 111,13 95,25 2080 4150 13,5 6 8.75 4.75 4.125 5 585 000 1 170 000 38.588 152,400 222,250 120,65 104,78 2600 5200 17,5

142

Designation

– GEZ 400 TXA-2LS GEZ 408 TXA-2LS GEZ 412 TXA-2LS GEZ 500 TXA-2LS GEZ 600 TXA-2LS

rb ra

3.3

Dimensions

Abutment and fillet dimensions

d dk

da min

r1 min

r2 min

in/mm

da max

Da min

Da max

ra max

rb max

in/mm

4 5.75 0.024 0.039 4.272 4.547 5.709 5.925 0.024 101,600 146,050 0,6 1 108,5 115,5 145 150,5 0,6 4.5 6.475 0.039 0.043 4.843 5.138 6.358 6.634 0.039 114,300 164,465 1 1,1 123 130,5 161,5 168,5 1 4.75 6.825 0.039 0.043 5.098 5.413 6.850 6.969 0.039 120,650 173,355 1 1,1 129,5 137,5 174 177 1 5 7.19 0.039 0.043 5.354 5.689 7.106 7.323 0.039 127 182,626 1 1,1 136 144,5 180,5 186 1 6 8.156 0.039 0.043 6.358 6.614 8.012 8.307 0.039 152,400 207,162 1 1,1 161,5 168 203,5 211 1

0.039 1 0.043 1,1 0.043 1,1 0.043 1,1 0.043 1,1

143

Maintenance-free radial spherical plain bearings, steel/PTFE FRP, metric sizes d 100 – 420 mm b B C

r2 r1

D dk

GEP .. FS

GEC .. FBAS

Principal dimensions Angle Basic load ratings Mass Designation of tilt dynamic static d D B C a C C0 mm

degrees

–

100

150

600

900

4,5

GEP 100 FS

110

160

720

1 080

5,35

GEP 110 FS

120

180

850

1 270

7,95

GEP 120 FS

140

210

100

1 200

1 800

GEP 140 FS

160

230

115

109

1 600

2 400

16,5

GEP 160 FS

180

260

128

122

2 080

3 100

24,5

GEP 180 FS

200

290

140

134

2 450

3 650

33,5

GEP 200 FS

220

320

155

148

3 050

4 550

GEP 220 FS

240

340

170

162

3 550

5 400

53,5

GEP 240 FS

260

370

185

175

4 250

6 400

69,5

GEP 260 FS

280

400

200

190

5 000

7 500

89,5

GEP 280 FS

300

430

212

200

5 600

8 300

110

GEP 300 FS

320

440 460

160 230

135 218

4 2

3 000 6 400

4 500 9 650

69,0 135

GEC 320 FBAS GEP 320 FS

340

460 480

160 243

135 230

3 2

3 150 7 100

4 750 10 800

73,0 150

GEC 340 FBAS GEP 340 FS

360

480 520

160 258

135 243

3 2

3 250 8 150

4 900 12 200

77,0 200

GEC 360 FBAS GEP 360 FS

380

520 540

190 272

160 258

4 2

4 300 9 150

6 550 13 700

116 220

GEC 380 FBAS GEP 380 FS

400

540 580

190 280

160 265

3 2

4 500 9 650

6 700 14 600

120 275

GEC 400 FBAS GEP 400 FS

420

560 600

190 300

160 280

3 2

4 650 10 600

6 950 16 000

126 300

GEC 420 FBAS GEP 420 FS

144

rb ra

3.4

Dimensions

Abutment and fillet dimensions

b b1 M d dk

da min

r1 min

r2 min

da max

Da min

Da max

ra max

rb max

100

135

7,5

107

114

125,6

141,9

110

145

7,5

117

122

135

151

120

160

7,5

128

135

149

171

140

185

7,5

148

155

173

200

160

210

7,5

169

175

195

218

180

240

7,5

1,1

191

203

224

246

200

260

11,5

1,1

211

219

242

276

220

290

13,5

1,1

232

245

270

304

240

310

13,5

1,1

253

259

289

323

260

340

15,5

1,1

274

285

317

352

280

370

15,5

1,1

294

311

345

381

300

390

15,5

1,1

315

327

363

411

320

380 414

21 21

8 8

1,1 1,1

3 3

328 335

344 344

370 385

426 434

1 1

3 3

340

400 434

21 21

8 8

1,1 1,1

3 3

348 356

366 359

391 404

446 453

1 1

3 3

360

420 474

21 21

8 8

1,1 1,1

3 4

368 377

388 397

412,5 441

466 490

1 1

3 4

380

450 494

21 21

8 8

1,5 1,5

4 4

389 398

407 412

435,5 460

503 508

1,5 1,5

4 4

400

470 514

21 21

8 8

1,5 1,5

4 4

409 418

429 431

457 478

523 549

1,5 1,5

4 4

420

490 534

21 21

8 8

1,5 1,5

4 4

429 439

451 441

478,5 497

543 568

1,5 1,5

4 4

145

Maintenance-free radial spherical plain bearings, steel/PTFE FRP, metric sizes d 440 – 850 mm b B C

r2 r1

D dk

GEP .. FS

GEC .. FBAS

Principal dimensions Angle Basic load ratings Mass Designation of tilt dynamic static d D B C a C C0 mm

degrees

–

440

600 630

218 315

185 300

3 2

5 850 12 200

8 800 18 600

176 360

GEC 440 FBAS GEP 440 FS

460

620 650

218 325

185 308

3 2

6 000 12 900

9 000 19 600

182 380

GEC 460 FBAS GEP 460 FS

480

650 680

230 340

195 320

3 2

6 700 14 300

10 000 21 200

216 435

GEC 480 FBAS GEP 480 FS

500

670 710

230 355

195 335

3 2

6 800 15 300

10 200 23 200

224 500

GEC 500 FBAS GEP 500 FS

530

710 750

243 375

205 355

3 2

7 650 17 000

11 400 25 500

266 585

GEC 530 FBAS GEP 530 FS

560

750 800

258 400

215 380

4 2

8 500 19 600

12 700 29 000

313 730

GEC 560 FBAS GEP 560 FS

600

800 850

272 425

230 400

3 2

9 800 22 000

14 600 33 500

378 860

GEC 600 FBAS GEP 600 FS

630

850 900

300 450

260 425

3 2

11 800 24 500

18 000 37 500

494 1 040

GEC 630 FBAS GEP 630 FS

670

900 950

308 475

260 450

3 2

12 500 27 500

18 600 41 500

551 1 210

GEC 670 FBAS GEP 670 FS

710

950 1 000

325 500

275 475

3 2

14 000 31 000

21 200 46 500

643 1 400

GEC 710 FBAS GEP 710 FS

750

1 000 1 060

335 530

280 500

3 2

15 000 34 500

22 400 52 000

727 1 670

GEC 750 FBAS GEP 750 FS

800

1 060 1 120

355 565

300 530

3 2

17 300 39 000

26 000 58 500

861 1 940

GEC 800 FBAS GEP 800 FS

850

1 120 1 220

365 600

310 565

3 2

18 600 45 000

28 000 67 000

983 2 600

GEC 850 FBAS GEP 850 FS

146

rb ra

3.4

Dimensions

Abutment and fillet dimensions

b b1 M d dk

da min

r1 min

r2 min

da max

Da max

Da min

ra max

rb max

440

520 574

27 27

10 10

1,5 1,5

4 4

450 460

472 479

502 534

583 596

1,5 1,5

4 4

460

540 593

27 27

10 10

1,5 1,5

4 5

470 481

494 496

524,5 552

603 612

1,5 1,5

4 5

480

565 623

27 27

10 10

2 2

5 5

491 503

516 522

547,5 580

629 641

2 2

5 5

500

585 643

27 27

10 10

2 2

5 5

511 523

537 536

571 598

650 670

2 2

5 5

530

620 673

27 27

10 10

2 2

5 5

541 554

570 558

605 626

689 709

2 2

5 5

560

655 723

27 27

10 10

2 2

5 5

572 585

602 602

639 673

729 758

2 2

5 5

600

700 773

27 27

10 10

2 2

5 6

612 627

644 645

683 719

779 801

2 2

5 6

630

740 813

35 35

13 13

3 3

6 6

646 661

676 677

716 757

824 850

3 3

6 6

670

785 862

35 35

13 13

3 3

6 6

686 702

722 719

765 802

874 898

3 3

6 6

710

830 912

35 35

13 13

3 3

6 6

726 743

763 762

810 849

924 946

3 3

6 6

750

875 972

35 35

13 13

3 3

6 6

766 784

808 814

856 904

974 1 005

3 3

6 6

800

930 1 022

35 35

13 13

3 3

6 6

817 836

859 851

907 951

1 033 1 062

3 3

6 6

850

985 1 112

35 35

13 13

3 3

6 7,5

867 888

914 936

963 1 035

1 093 1 156

3 3

6 7,5

147

Maintenance-free radial spherical plain bearings, steel/PTFE FRP, metric sizes d 900 – 1 000 mm b B C

r2 r1

D dk

GEP .. FS

GEC .. FBAS

Principal dimensions Angle Basic load ratings Mass Designation of tilt dynamic static d D B C a C C0 mm

degrees

–

900

1 180 1 250

375 635

320 600

3 2

20 400 49 000

31 000 73 500

1 120 2 690

GEC 900 FBAS GEP 900 FS

950

1 250 1 360

400 670

340 635

3 2

23 200 56 000

34 500 85 000

1 340 3 620

GEC 950 FBAS GEP 950 FS

1 000

1 320 1 450

438 710

370 670

3 2

27 000 63 000

40 000 95 000

1 650 4 470

GEC 1000 FBAS GEP 1000 FS

148

rb ra

3.4

Dimensions

Abutment and fillet dimensions

b b1 M d dk

da min

r1 min

r2 min

da max

Da min

Da max

ra max

rb max

900

1 040 1 142

35 35

13 13

3 3

6 7,5

917 938

970 949

1 017 1 063

1 153 1 183

3 3

6 7,5

950

1 100 1 242

40 40

15 15

4 4

7,5 7,5

969 993

1 024 1 045

1 074 1 156

1 217 1 290

4 4

7,5 7,5

1 000

1 160 1 312

40 40

15 15

4 4

7,5 7,5

1 020 1 045

1 074 1 103

1 128 1 221

1 287 1 378

4 4

7,5 7,5

149

Angular contact spherical plain bearings Dimensions...................................................................................................................................... Tolerances........................................................................................................................................ Radial internal clearance, preload.................................................................................................. Materials.......................................................................................................................................... Permissible operating temperature range..................................................................................... Special designs................................................................................................................................

152 152 153 154 154 154

Product tables......................................................................................................... 4.1â&#x20AC;&#x201A; Maintenance-free angular contact spherical plain bearings, steel/PTFE FRP.....................

156 156

151

Angular contact spherical plain bearings

Tolerances

As their name implies, the sliding contact surfaces of angular contact spherical plain bearings are spherical in shape and inclined at an angle to the bearing axis († fig. 1). Consequently, these bearings are well suited for accommodating combined (radial and axial) loads. Single angular contact spherical plain bearings can only accommodate axial loads acting in one direction. These bearings can be separated, enabling the rings to be mounted separately. SKF manufactures steel/PTFE FRP (fibre reinforced polymer containing PTFE) mainten ance-free angular contact spherical plain bearings as standard. Designs with other sliding surface combinations are available on request († Special designs, starting on page 154).

The dimensional tolerances for SKF angular contact spherical plain bearings are listed in table 1 and are in accordance with ISO 12240-2:1998. The symbols used in the tolerance table are explained in the following: d nominal bore diameter Ddmp deviation of the mean bore diameter from the nominal D nominal outside diameter DDmp deviation of the mean outside diameter from the nominal DBs deviation of the single inner ring width from the nominal DCs deviation of the single outer ring width from the nominal DTs deviation of the single bearing width from the nominal

Dimensions The boundary dimensions of SKF angular contact spherical plain bearings are in accordance with ISO 12240-2:1998.

Table 1 Dimensional tolerances for angular contact spherical plain bearings Nominal diameter d, D over incl.

Inner ring Ddmp DBs high low high low

Outer ring DDmp DCs high low high low

Bearing width DTs1) high low

µm

–12

–240

–14

–240

+250

–400

–15

–300

–16

–300

+250

–500

120

–20

–400

–18

–400

+250

–600

120

150

–

–20

–500

–

150

180

–

–25

–500

–

1) The tolerance of the bearing width depends on d.

152

Radial internal clearance, preload

Fig. 1

The internal clearance of a single angular contact spherical plain bearing is only obtained after mounting and depends on the adjustment against a second bearing that provides axial location in the opposite direction. Angular contact spherical plain bearings are generally mounted as pairs in a back-to-back († fig. 2) or face-to-face arrangement († fig. 3). The bearings are adjusted against each other by axially displacing one bearing ring until a specific bearing load of 10 N/mm2 is obtained. The preload prevents some of the deformations that typically occur under load and after a brief running-in period. When adjusting a new bearing arrangement for the first time, the specific bearing load of 10 N/mm2 is achieved when the frictional moment and the axial preload force are in the ranges listed in table 2.

Load line through an angular contact spherical plain bearing

Fig. 2 Angular contact spherical plain bearings, back-to-back arrangement

Table 2 Frictional moment and axial preload force Bearing

Frictional moment for 10 N/mm2 min max

Axial preload force for 10 N/mm2

–

GAC 25 F GAC 30 F GAC 35 F

7 12 16

9 14 19

5 600 7 500 9 300

GAC 40 F GAC 45 F GAC 50 F

21 26 31

25 32 38

10 600 13 600 12 900

GAC 60 F GAC 70 F GAC 80 F

51 76 105

62 92 126

17 800 21 000 30 000

GAC 90 F GAC 100 F GAC 110 F

153 180 273

184 216 328

41 700 39 500 54 500

GAC 120 F

317

380

69 500

Fig. 3 Angular contact spherical plain bearings, face-to-face arrangement

153

Angular contact spherical plain bearings

Materials The inner and outer rings of SKF angular contact spherical plain bearings are made of bearing steel that has been through-hardened and ground. The sliding layer of fibre reinforced polymer, containing PTFE, is injection moulded onto the outer ring († fig. 4). The sliding surface of the inner ring is hard chromium plated and coated with a lithium base grease.

Fig. 4 Maintenance-free angular contact spherical plain bearing, steel/PTFE FRP

Permissible operating temperature range Spherical plain bearings with a steel/PTFE FRP sliding contact surface combination can be used for operating temperatures ranging from –40 to +75 °C. For brief periods, temperatures up to 110 °C can be tolerated. However, keep in mind that the load carrying capacity of the bearing is reduced at temperatures that exceed 50 °C. For additional information, contact the SKF application engineering service.

Fig. 5 Maintenance-free angular spherical plain bearing, steel/PTFE fabric

Special designs Special operating conditions may require angular contact spherical plain bearings with a steel/ PTFE fabric or steel/steel sliding contact surface combination. These bearings are available on request. Bearings with a maintenance-free steel/PTFE fabric sliding contact surface combination († fig. 5) should be used when lubricant-free operation is specified. These bearings can accommodate heavy loads, preferably in a constant direction. Steel/steel bearings († fig. 6) are typically used in applications where operating temperatures or load frequencies are high, or where heavy or shock loads occur. To operate properly, steel/steel bearings must be provided with an adequate supply of lubricant. Depending on the operating conditions, the sliding surface of the outer ring may be equipped with various multigroove patterns († figs. 7 and 8). For additional information, contact the SKF application engineering service. Upon request, inch steel/steel angular contact spherical plain bearings are also available as double direction angular contact spherical plain bearings. Double direction bearings can be used instead of two angular contact bearings in a face-to face arrangement, or as a high capacity 154

Fig. 6 Angular contact spherical plain bearing, steel/steel, requiring maintenance

Fig. 7 Angular contact spherical plain bearing with “waffle” grooves, steel/steel

radial bearing. Double direction angular contact spherical plain bearings consist of two outer rings and a standard inner ring. SKF supplies these bearings with (GEZPR .. S series) or without (GEZP .. S series) a shim between the two outer rings. The shim simplifies installation and optimizes axial internal clearance within the bearing († fig. 9).

Fig. 8 Angular contact spherical plain bearing with “diamond thread” grooves, steel/steel

Fig. 9 Double direction angular contact spherical plain bearing in the GEZPR .. S series, steel/steel

155

Maintenance-free angular contact spherical plain bearings, steel/PTFE FRP d 25 – 120 mm

T C

s r2 r1

D d

a GAC .. F

Principal dimensions d D T

Angle of tilt

Basic load ratings Mass dynamic static

degrees

–

3,5

21,6

34,5

0,14

GAC 25 F

3,5

0,21

GAC 30 F

3,5

32,5

0,27

GAC 35 F

3,5

0,33

GAC 40 F

45,5

73,5

0,42

GAC 45 F

0,46

GAC 50 F

69,5

112

0,73

GAC 60 F

110

2,5

143

1,05

GAC 70 F

125

2,5

110

176

1,55

GAC 80 F

140

2,5

134

216

2,10

GAC 90 F

100

150

170

270

2,35

GAC 100 F

110

170

200

320

3,70

GAC 110 F

120

180

1,5

240

380

4,00

GAC 120 F

156

Designation

ra ra

Da da

db Db

Dimensions

Abutment and fillet dimensions

B C d dk

da max

r1 min

r2 s min

db max

Da min

Db min

4.1

ra max

0,6

0,3

0,6

49,5

0,3

1,3

50,5

55,5

0,3

2,1

56,5

0,3

2,8

68,5

0,3

3,5

0,3

4,3

74,5

1 1,5

88,5

1,5

0,6

5,7

102

1,5

0,6

7,2

103

1,5

115

25,5

1,5

0,6

8,6

104

116

1,5

128,5

0,6

10,1

101

118

105

129

100

141

0,6

11,6

112

128

120

141

110

155

2,5

0,6

124

145

130

156

2,5

120

168

2,5

0,6

14,5

134

155

140

169

2,5

157

Thrust spherical plain bearings Dimensions...................................................................................................................................... Tolerances........................................................................................................................................ Materials.......................................................................................................................................... Permissible operating temperature range..................................................................................... Special designs................................................................................................................................

160 160 161 161 162

Product tables......................................................................................................... 5.1â&#x20AC;&#x201A; Maintenance-free thrust spherical plain bearings, steel/PTFE FRP.....................................

164 164

159

Thrust spherical plain bearings Thrust spherical plain bearings have a convex spherical surface on the shaft washer and a corresponding concave spherical surface in the housing washer († fig. 1). They are intended to accommodate primarily axial loads but can also accommodate combined (radial and axial) loads. The radial load component of a combined load should not exceed 50% of the axial load component. When radial loads are larger, it is advisable to combine thrust bearings with radial bearings in the GE dimension series († fig. 2). Thrust spherical plain bearings are separable, e.g. shaft and housing washers can be mounted separately. SKF manufactures thrust spherical plain bearings with the maintenance-free steel/ PTFE FRP (fibre reinforced polymer containing PTFE) sliding contact surface combination as standard. Other sliding surface combinations are available on request († Special designs, page 162).

Tolerances The dimensional tolerances for SKF thrust spherical plain bearings are listed in table 1 and are in accordance with ISO 12240-3:1998. The symbols used in the tolerance table are explained in the following: d nominal bore diameter (shaft washer) Ddmp deviation of the mean bore diameter from the nominal D nominal outside diameter (housing washer) DDmp deviation of the mean outside diameter from the nominal DBs deviation of the single shaft washer height from the nominal DCs deviation of the single housing washer height from the nominal DTs deviation of the single thrust bearing height from the nominal

Dimensions The principal dimensions of SKF thrust spherical plain bearings are in accordance with ISO 12240-3:1998.

Fig. 1 Standard thrust spherical plain bearing, steel/PTFE FRP

160

Fig. 2 Combination of a radial and a thrust spherical plain bearing

Materials Shaft and housing washers for SKF thrust spherical plain bearings are made of bearing steel that has been through-hardened and ground. The sliding surface of the shaft washer is hard chromium plated and coated with a lithium base grease. The sliding layer of fibre reinforced polymer, containing PTFE, is injection moulded onto the housing washer.

Permissible operating temperature range Thrust spherical plain bearings with a steel/ PTFE FRP sliding contact surface combination can be used for operating temperatures ranging from –40 to +75 °C. For brief periods, temperatures up to 110 °C can be tolerated. However, keep in mind that the load carrying capacity of the bearing is reduced at temperatures that exceed 50 °C. For additional information, contact the SKF application engineering service.

Table 1 Dimensional tolerances for thrust spherical plain bearings Nominal diameter d, D over incl.

Shaft washer Ddmp DBs high low high low

Housing washer DDmp DCs high low high low

Bearing height DTs1) high low

µm

– 18 30

18 30 50

0 0 0

–8 –10 –12

0 0 0

–240 –240 –240

– – 0

– – –11

– – 0

– – –240

+250 +250 +250

–400 –400 –400

50 80 120

80 120 150

0 0 –

–15 –20 –

0 0 –

–300 –400 –

0 0 0

–13 –15 –18

0 0 0

–300 –400 –500

+250 +250 –

–500 –600 –

150 180

180 230

– –

0 0

–25 –30

0 0

–500 –600

– –

1) The tolerance of the bearing height is dependent on d.

161

Special designs Special operating conditions may require thrust spherical plain bearings with a steel/steel or steel/PTFE fabric sliding contact combination, which are available on request. Steel/steel bearings (â&#x20AC; fig. 3) are typically used in applications where operating temperatures or load frequencies are high, or where heavy loads or shock loads occur. Steel/steel bearings must be provided with an adequate supply of lubricant. Depending on the operating conditions, the sliding surface of the outer ring may be equipped with various multi-groove patterns. Bearings with a maintenance-free steel/PTFE fabric sliding contact surface (â&#x20AC; fig. 4) should be used when lubricant-free operation is specified. These bearings can accommodate heavy loads, preferably in a constant direction.

162

Fig. 3 Thrust spherical plain bearing, steel/steel, requiring maintenance

Fig. 4 Maintenance-free thrust spherical plain bearing, steel/PTFE fabric

163

Maintenance-free thrust spherical plain bearings, steel/PTFE FRP d 17 â&#x20AC;&#x201C; 120 mm

d1 dk

r1 B

r1 d D1 D

GX .. F

Principal dimensions Angle Basic load ratings Mass Designation of tilt dynamic static d D T a C C0 mm

degrees

â&#x20AC;&#x201C;

36,5

58,5

0,14

GX 17 F

46,5

73,5

0,25

GX 20 F

22,5

69,5

112

0,42

GX 25 F

153

0,61

GX 30 F

134

216

0,98

GX 35 F

105

173

275

1,50

GX 40 F GX 45 F

120

36,5

224

355

2,25

130

42,5

275

440

3,15

GX 50 F

150

375

600

4,65

GX 60 F

160

475

750

5,40

GX 70 F

180

570

915

6,95

GX 80 F

100

210

735

1 180

11,0

GX 100 F

120

230

880

1 430

14,0

GX 120 F

164

da ra

ra Da

Dimensions

Abutment and fillet dimensions

d1 D1 B C d dk

da min

r1 s min

Da max

ra max

43,5

11,8

11,2

0,6

14,5

13,8

12,5

58,5

34,5

16,5

16,7

17,5

50,5

20,7

114

21,5

24,5

128

110

25,5

27,5

139

120

30,5

105

160

140

109

120

176

153

94,5

36,5

121

125

197

172

107,5

43,5

42,5

135

145

100

222

198

127

155

170

120

250

220

145

53,5

52,5

170

190

5.1

165

Rod ends requiring maintenance Dimensions...................................................................................................................................... Tolerances........................................................................................................................................ Radial internal clearance................................................................................................................. Materials.......................................................................................................................................... Permissible operating temperature range..................................................................................... Fatigue strength.............................................................................................................................. Relubrication facilities.....................................................................................................................

168 168 169 169 170 171 171

Product tables......................................................................................................... 6.1 Rod ends with a female thread, steel/steel............................................................................. 6.2 Rod ends with a female thread, for hydraulic cylinders, steel/steel...................................... 6.3 Rod ends with a male thread, steel/steel................................................................................ 6.4 Rod ends with a cylindrical section welding shank, steel/steel.............................................. 6.5 Rod ends with a rectangular section welding shank, steel/steel........................................... 6.6 Rod ends with a female thread, steel/bronze......................................................................... 6.7 Rod ends with a male thread, steel/bronze............................................................................

172 172 174 178 180 182 184 186

167

Rod ends requiring maintenance Fig. 1

SKF manufactures rod ends requiring mainten ance with a steel/steel or a steel/bronze sliding contact surface combination. Steel/steel rod ends consist of a rod end housing and a steel/steel radial spherical plain bearing from the standard assortment, where the outer ring is secured in the housing. These rod ends are available with a female thread († fig. 1), male thread († fig. 2) or a welding shank († fig. 3). Steel/bronze rod ends consist of a rod end housing and a steel/bronze spherical plain bearing. These bearings have an inner ring made of steel and an outer ring made of bronze. The bearing is held in position by staking the housing on both sides of the outer ring. These rod ends are available with a male or female thread. SKF supplies rod ends with a threaded shank with a right-hand thread as standard. With the exception of rod ends with the designation suffix VZ019, all rod ends are also available with a left-hand thread. They are identified by the designation prefix L.

Rod end with a female thread

Fig. 2 Rod end with a male thread

Dimensions The dimensions of SKF rod ends requiring maintenance are in accordance with the standards listed in table 1. Male and female threads of SKF rod ends are in accordance with ISO 965-1:1998, except for rod ends with female thread having the designation suffix /VZ019, which is in accordance with ISO 8139:2009.

Tolerances

Fig. 3

SKF rod end inner ring dimensional tolerances are in accordance with ISO 12240-4:1998. The tolerances for the steel/steel rod end inner rings are listed in table 3 and the tolerances for steel/ bronze rod end inner rings are listed in table 2. The symbols used in these tables are explained in the following:

Rod ends with a welding shank

d nominal bore diameter Ddmp deviation of the mean bore diameter from the nominal DBs deviation of the single inner ring width from the nominal

168

cylindrical section

rectangular section

Radial internal clearance

Table 1

The clearance values for steel/steel rod ends are in accordance with dimension series E and EH of ISO 12240-4:1998, as far as they have been standardized. The values are listed in table 4 on page 170. The clearance values for steel/bronze rod ends are in accordance with dimensions series K of ISO 12240-4:1998 and are listed in table 5 on page 170.

Materials SKF rod end housings for bearings that require maintenance are made of the materials listed in table 6 on page 170. The materials used for steel/steel radial spherical plain bearings incorporated in SKF rod ends are provided in the section Materials on page 102. The bearings incorporated in the steel/bronze rod ends have an outer ring made of bronze and an inner ring made of bearing steel which has been hardened and ground.

Standards Series

Standards

SA(A) SI(A)

ISO 12240-4:1998 dimension series E, EH ISO 12240-4:1998 dimension series E, EH

SC SCF

ISO 12240-4:1998 dimension series E –

SIJ SIR SIQG

ISO 8133:2006 – ISO 8132:2006

SAKAC ISO 12240-4:1998 dimension series K SIKAC ISO 12240-4:1998 dimension series K SIKAC/VZ019 ISO 8139:2009, ISO 12240-4:1998

Table 2 Inner ring dimensional tolerances for steel/bronze rod ends Bore diameter d over incl.

SIKAC and SAKAC series Ddmp high low

DBs high low

µm

– 6 10

6 10 18

12 15 18

0 0 0

–120 –120 –120

–120

6 Table 3 Inner ring dimensional tolerances for steel/steel rod ends Bore diameter d over incl.

SA(A), SI(A), SIJ, SIR, SC and SCF series DBs Ddmp high low high low

SIQG series Ddmp high low

DBs high low

µm

– 10 18

10 18 30

0 0 0

–8 –8 –10

0 0 0

–120 –120 –120

– 18 21

– 0 0

– –180 –210

30 50 80

50 80 120

0 0 0

–12 –15 –20

0 0 0

–120 –150 –200

25 30 35

0 0 0

–250 –300 –350

120 180

180 250

0 0

–25 –30

0 0

–250 –300

40 46

0 0

–400 –460

169

Rod ends requiring maintenance

Permissible operating temperature range The permissible operating temperature range for SKF rod ends requiring maintenance depends on the rod end housing, the bearing, the bearing seals and the grease used for lubrication. The values for the permissible operating temperature range are listed in table 7.

The load carrying capacity of the rod end is reduced at temperatures above 100 °C. For temperatures below 0 °C, check to be sure that the fracture toughness of the rod end housing is adequate for the intended application.

Table 4

Table 5

Radial internal clearance for steel/steel rod ends

Radial internal clearance for steel/bronze rod ends

Bore diameter d over incl.

Radial internal clearance Normal min max

Bore diameter d over incl.

Radial internal clearance Normal min max

µm

– 12 20

12 20 35

16 20 25

68 82 100

– 6 10

6 10 18

5 7 8

50 61 75

35 60 90

60 90 140

30 36 42

120 142 165

140

240

192

Table 6 Housing materials for rod ends requiring maintenance Series

Size

Material

Material No.

SA(A) 6 to 80 SI(A) 6 to 80

Heat treatable steel C45V zinc coated and chromatized Heat treatable steel C45V zinc coated and chromatized

1.0503

SC SCF

20 to 80 20 to 80

Construction steel S 355 J2G3 (St 52-3 N) Construction steel S 355 J2G3 (St 52-3 N)

1.0570 1.0570

SIQG SIJ SIR

12 to 63 70 to 200 12 to 50 60 to 100 25 to 80 90 to 120

Heat treatable steel C45 EN-GJS-400-15 Heat treatable steel C45 EN-GJS-400-15 Heat treatable steel C45 EN-GJS-400-15

1.0503 – 1.0503 – 1.0503 –

SAKAC 5 to 12 14 to 30 SIKAC 5 to 12 14 to 30

Free-machining steel 9 SMnPb 28 K zinc coated and chromatized Heat treatable steel C35N zinc coated and chromatized Free-machining steel 9 SMnPb 28 K zinc coated and chromatized Heat treatable steel C35N zinc coated and chromatized

SKF reserves the right to use similar material or material of higher strength.

170

1.0503

1.0718 1.0501 1.0718 1.0501

Fatigue strength

Table 7

In all applications where a rod end is subjected to alternating loads, loads that vary in magnitude or where failure of a rod end is dangerous, make sure that the selected rod end has sufficient fatigue strength.

Relubrication facilities SKF rod ends requiring maintenance are provided with a grease fitting or a lubrication hole in the rod end housing. Relubrication via the pin is also possible. Exceptions are steel/steel rod ends in the SA .. E and SI .. E series and a few smaller rod ends as indicated in the product tables. The type and design of relubrication facilities in the rod end housing are listed in table 8.

Permissible operating temperature range for rod ends requiring maintenance Series

Permissible operating temperature range1)

from

–

°C

incl.

Steel/steel rod ends SA .. E(S) SA(A) .. ES-2RS SI .. E(S) SI(A) .. ES-2RS SIQG .. ES SIJ .. ES SIR .. ES SC(F) .. ES

–50 –30 –50 –30 –50 –50 –50 –50

+200 +130 +200 +130 +200 +200 +200 +200

–30 –30

+180 +180

Steel/bronze rod ends SAKAC .. M SIKAC .. M (/VZ 019)

1) Permissible operating temperature range of the grease

must be considered.

Table 8 Relubrication facilities for rod ends requiring maintenance Series Size

Relubrication facilities Design

Steel/steel rod ends SA .. ES SI .. ES SI .. ES SIJ .. ES SC .. ES

15 to 20 15 to 20 15 to 20 16 to 20 20

Lubrication hole diameter 2,5 mm

SA(A) .. ES(-2RS) SI(A) .. ES(-2RS) SIJ .. ES SIR .. ES SIQG .. ES(A) SC .. ES SCF .. ES

25 to 80 25 to 80 25 to 100 25 to 120 12 to 200 25 to 80 20 to 80

Grease fitting in accordance with DIN 71412: 1987

6 to 30 6 to 30

Grease fitting in accordance with DIN 3405: 1986

Steel/bronze rod ends SAKAC .. M SIKAC .. M(/VZ 019)

171

Rod ends with a female thread, steel/steel d 6 – 80 mm B C1

dk d r1

l7 l4 h1

l5 d4

G w SI(L) .. E

Principal dimensions Angle Basic load ratings Mass of tilt dynamic static G B C1 h1 a C C0 d d2 max 6H max

Designations Rod end with right-hand thread

degrees kN

–

M 6

4,5

3,4

8,15

0,023

SI 6 E1)

SIL 6 E1)

M 8

6,5

5,5

12,9

0,036

SI 8 E1)

SIL 8 E1)

10 12

30 35

M 10 M 12

9 10

7,5 8,5

43 50

12 10

8,15 10,8

19 25,5

0,065 0,11

left-hand thread

SI 10

E1)

SIL 10 E1)

SI 12

E1)

SIL 12 E1)

M 14

10,5

37,5

0,18

SI 15 ES

SIL 15 ES

M 16

11,5

21,2

0,25

SI 17 ES

SIL 17 ES

M 20¥1,5 16

13,5

0,36

SI 20 ES

SIL 20 ES

M 24¥2

0,65

SI 25 ES

SIL 25 ES

M 30¥2

110

116

1,00

SI 30 ES

SIL 30 ES

M 36¥3

130

134

1,40

SI 35 ES-2RS

SIL 35 ES-2RS

94 94

M 39¥3 M 42¥3

28 28

24 24

142 145

6 6

100 100

166 166

2,20 2,30

SIA 40 ES-2RS SI 40 ES-2RS

SILA 40 ES-2RS SIL 40 ES-2RS

104 104

M 42¥3 M 45¥3

32 32

28 28

145 165

7 7

127 127

224 224

2,90 3,20

SIA 45 ES-2RS SI 45 ES-2RS

SILA 45 ES-2RS SIL 45 ES-2RS

114 114

M 45¥3 M 52¥3

35 35

31 31

160 195

6 6

156 156

270 270

4,10 4,50

SIA 50 ES-2RS SI 50 ES-2RS

SILA 50 ES-2RS SIL 50 ES-2RS

137 137

M 52¥3 M 60¥4

44 44

39 39

175 225

6 6

245 245

400 400

6,30 7,10

SIA 60 ES-2RS SI 60 ES-2RS

SILA 60 ES-2RS SIL 60 ES-2RS

162 162

M 56¥4 M 72¥4

49 49

43 43

200 265

6 6

315 315

530 530

9,50 10,5

SIA 70 ES-2RS SI 70 ES-2RS

SILA 70 ES-2RS SIL 70 ES-2RS

182 182

M 64¥4 M 80¥4

55 55

48 48

230 295

5 5

400 400

655 655

15,0 19,0

SIA 80 ES-2RS SI 80 ES-2RS

SILA 80 ES-2RS SIL 80 ES-2RS

1) No relubrication facilities.

172

SI(L) .. ES

d ≤ 20 mm

SI(L)A .. ES-2RS SI(L) .. ES-2RS

d ≥ 25 mm

Dimensions d4 l3 l4 l5 l7 r1 w d dk ≈ min max ≈ min min h14 mm 6

0,3

106

0,3

35,5

128

0,6

40,7

149

0,6

174

0,6

53 53

58 58

65 65

191 194

25 25

46 46

0,6 0,6

50 50

60 60

65 65

199 219

30 30

50 50

0,6 0,6

55 55

66 66

70 70

68 68

219 254

30 30

58 58

0,6 0,6

60 60

80 80

82 82

70 70

246 296

35 35

73 73

1 1

70 70

92 92

80 80

284 349

40 40

85 85

1 1

80 80

105 105

85 85

324 389

45 45

98 98

1 1

90 90

6.1

173

Rod ends with a female thread, for hydraulic cylinders, steel/steel d 12 – 70 mm B C1

dk d r1

l4 h1

G d4

A-B

SI(L)J .. ES

Principal dimensions Angle Basic load ratings Mass of tilt dynamic static G B C1 h1 a C C0 d d2 max 6H max

Designations Rod end with right-hand thread

degrees kN

–

36 33

M 10¥1,25 10 M 12¥1,25 12

8 11

42 38

3 4

10,8 10,8

21,2 22

0,14 0,11

SIJ 12 E2) SILJ 12 E2) SIQG 12 ESA3) SILQG 12 ESA3)

45 41

M 12¥1,25 14 M 14¥1,5 16

11 14

48 44

3 4

21,2 17,6

23,5 32,5

0,25 0,21

SIJ 16 ES SIQG 16 ES

SILJ 16 ES SILQG 16 ES

55 48

M 14¥1,5 M 16¥1,5

16 20

13 17,5

58 52

3 4

30 30

51 43

0,40 0,40

SIJ 20 ES SIQG 20 ES

SILJ 20 ES SILQG 20 ES

65 57 59

M 16¥1,5 M 16¥1,5 M 20¥1,5

20 20 25

17 23,5 22

68 50 65

3 7 4

48 48 48

73,5 52 69,5

0,68 0,49 0,66

SIJ 25 ES SIR 25 ES SIQG 25 ES

SILJ 25 ES SILR 25 ES SILQG 25 ES

80 65

M 20¥1,5 M 22¥1,5

22 22

19 28,5

85 60

3 6

62 62

112 78

1,35 0,77

SIJ 30 ES SIR 30 ES

SILJ 30 ES SILR 30 ES

M 27¥2

65,5

100

1,20

SIQG 32 ES

SILQG 32 ES

M 28¥1,5

30,5

118

1,20

SIR 35 ES

SILR 35 ES

98 95 90

M 27¥2 M 35¥1,5 M 33¥2

28 28 40

23 35,5 34

105 85 97

3 7 4

100 100 100

146 200 176

2,40 2,10 2,00

SIJ 40 ES SIR 40 ES SIQG 40 ES

SILJ 40 ES SILR 40 ES SILQG 40 ES

122 118 110

M 33¥2 M 45¥1,5 M 42¥2

35 35 50

30 40,5 42

130 105 120

3 6 4

156 156 156

216 280 270

3,80 3,60 3,50

SIJ 50 ES SIR 50 ES SIQG 50 ES

SILJ 50 ES SILR 50 ES SILQG 50 ES

160 132

M 42¥2 M 58¥1,5

44 44

38 50,5

150 130

3 6

245 245

405 325

8,50 6,00

SIJ 60 ES SIR 60 ES

SILJ 60 ES SILR 60 ES

134

M 48¥2

53,5

140

255

375

6,80

SIQG 63 ES

SILQG 63 ES

156

M 65¥1,5

55,5

150

315

450

9,40

SIR 70 ES

SILR 70 ES

1) Check availability of rod ends with left-hand thread. 2) No relubrication facilities. 3) Can only be relubricated via the outer ring.

174

left-hand thread1)

B C1

C1 B

dk d r1

dk d

G d4

SI(L)QG .. ES

SI(L)R .. ES

Dimensions Cylinder bolt with internal hexagon (ISO 4762:1998) d4 l3 l4 l7 N N 1 r1 Size Tightening d dk max min max min max max min torque mm

â&#x20AC;&#x201C;

18 18

17 17

15 17

62 55

16 13

40 33

13 11

0,3 0,3

M6 M5

10 5,5

25 23

21 22

17 19

70,5 64,5

20 17

45 41

13 14

0,3 0,3

M6 M6

10 9,5

29 29

25 26,5

19 23

85,5 77

25 21

55 48

17 18

0,3 0,3

M8 M8

25 23

35,5 35,5 35,5

30 26 31

23 17 29

100,5 79,5 97

30 27 26

62 42 55

17 23,5 18

0,6 0,6 0,6

M8 M8 M8

25 23 23

40,7 40,7

36 33

29 23

125 93,5

35 29

80 47

19 28,5

0,6 0,6

M 10 M8

45 23

116,5

0,6

M 10

41,5

110,5

30,5

0,6

M 10

53 53 53

45 50,5 47

37 36 46

155 133,5 143

45 44 40

90 67 81

23 35,5 28

0,6 0,6 0,6

M 10 M 10 M 10

45 46 46

66 66 66

55 62,5 58

46 46 57

192,5 164,5 175,5

58 54 49

105 89 97,5

30 40,5 33

0,6 0,6 0,6

M 12 M 121) M 12

80 791) 79

80 80

68 76,5

57 59

230 202,5

68 64

134 91

38 50,5

1 1

M 16 M 161)

160 461)

213,5

116

M 161)

1951)

M 161)

791)

87,5

234,5

101

55,5

6.2

1) Bolts, position of bolts, and tightening torque may vary.

175

Rod ends with a female thread, for hydraulic cylinders, steel/steel d 80 – 200 mm B C1

dk d r1

l4 h1

G d4

A-B

SI(L)J .. ES

Principal dimensions Angle Basic load ratings Mass of tilt dynamic static G B C1 h1 a C C0 d d2 max 6H max

Designations Rod end with right-hand thread

degrees kN

–

205 178 170

M 48¥2 M 80¥2 M 64¥3

55 55 80

47 60,5 68

185 170 180

3 6 4

400 400 400

610 560 600

14,5 13,0 14,5

SIJ 80 ES SIR 80 ES SIQG 80 ES

SILJ 80 ES SILR 80 ES SILQG 80 ES

100

240 232 212

M 64¥3 M 110¥2 M 80¥3

70 70 100

57 70,5 85,5

240 235 210

3 7 4

610 610 610

780 950 930

29,5 30,0 28,0

SIJ 100 ES SIR 100 ES SIQG 100 ES

SILJ 100 ES SILR 100 ES SILQG 100 ES

120

343

M 130¥3

90,5

310

950

2 450

84,0

SIR 120 ES

SILR 120 ES

125

268

M 100¥3

125

105

260

950

1 430

43,0

SIQG 125 ES

SILQG 125 ES

160

328

M 125¥4

160

133

310

1 370 2 200

80,0

SIQG 160 ES

SILQG 160 ES

200

420

M 160¥4

200

165

390

2 120 3 400

165

SIQG 200 ES

SILQG 200 ES

176

left-hand thread

B C1

C1 B

dk d r1

dk d

G d4

SI(L)R .. ES

SI(L)QG .. ES

Dimensions Cylinder bolt with internal hexagon (ISO 4762:1998) d4 l3 l4 l7 N N 1 r1 Size Tightening d dk max min max min max max min torque mm

â&#x20AC;&#x201C;

105 105 105

90 103,5 91

64 81 86

287,5 267,5 272,5

92 79 77

156 126 150

47 60,5 50

1 1 1

M 20 M 201) M 201)

310 1951) 3901)

100

130 130 130

110 140 110

86 111 96

360 362,5 324

116 103 97

190 167 180

57 70,5 65

1 1 1

M 24 M 241) M 241)

530 3901) 6701)

120

160

175

135

493

138

257

M 241)

6701)

125

160

135

113

407

118

202

M 241)

6701)

M 241)

6701)

1,1

M 301)

1 3501)

160 200

200 250

165 215

126 161

490 623

148 193

252 323

85 106

6.2

1) Bolts, position of bolts, and tightening torque may vary.

177

Rod ends with a male thread, steel/steel d 6 – 80 mm B C1

dk d

l2 h

G SA(L) .. E

SA(L) .. ES

d ≤ 20 mm

d ≥ 25 mm

Principal dimensions Angle Basic load ratings Mass of tilt dynamic static G B C1 h a C C0 d d2 max 6g max

Designations Rod end with right-hand thread

degrees kN

–

M 6

4,5

3,4

8,15

0,017

SA 6 E1)

SAL 6 E1)

M 8

6,5

5,5

12,9

0,029

SA 8 E1)

SAL 8 E1)

10 12

30 35

M 10 M 12

9 10

7,5 8,5

48 54

12 10

8,15 10,8

18,3 24,5

0,053 0,078

left-hand thread

SA 10

E1)

SAL 10 E1)

SA 12

E1)

SAL 12 E1)

M 14

10,5 63

0,13

SA 15 ES

SAL 15 ES

M 16

11,5 69

21,2

0,19

SA 17 ES

SAL 17 ES

M 20¥1,5 16

13,5 78

42,5

0,32

SA 20 ES

SAL 20 ES

M 24¥2

0,53

SA 25 ES

SAL 25 ES

M 30¥2

110

81,5

0,90

SA 30 ES

SAL 30 ES

M 36¥3

130

110

1,30

SA 35 ES-2RS

SAL 35 ES-2RS

94 94

M 39¥3 M 42¥3

28 28

24 24

150 145

6 6

100 100

140 140

1,85 1,90

SAA 40 ES-2RS SA 40 ES-2RS

SALA 40 ES-2RS SAL 40 ES-2RS

104 104

M 42¥3 M 45¥3

32 32

28 28

163 165

7 7

127 127

200 200

2,45 2,55

SAA 45 ES-2RS SA 45 ES-2RS

SALA 45 ES-2RS SAL 45 ES-2RS

114 114

M 45¥3 M 52¥3

35 35

31 31

185 195

6 6

156 156

245 245

3,30 3,90

SAA 50 ES-2RS SA 50 ES-2RS

SALA 50 ES-2RS SAL 50 ES-2RS

137 137

M 52¥3 M 60¥4

44 44

39 39

210 225

6 6

245 245

360 360

5,70 6,25

SAA 60 ES-2RS SA 60 ES-2RS

SALA 60 ES-2RS SAL 60 ES-2RS

162 162

M 56¥4 M 72¥4

49 49

43 43

235 265

6 6

315 315

490 490

7,90 10,0

SAA 70 ES-2RS SA 70 ES-2RS

SALA 70 ES-2RS SAL 70 ES-2RS

182 182

M 64¥4 M 80¥4

55 55

48 48

270 295

5 5

400 400

585 585

12,0 14,5

SAA 80 ES-2RS SA 80 ES-2RS

SALA 80 ES-2RS SAL 80 ES-2RS

1) No relubrication facilities.

178

SA(L)A .. ES-2RS

Dimensions d dk

l1 min

l2 max

l7 min

r1 min

mm 6

0,3

107

0,3

35,5

128

0,6

40,7

149

0,6

174

0,6

53 53

86 90

199 194

46 46

0,6 0,6

60 60

92 95

217 219

50 50

0,6 0,6

66 66

104 110

244 254

58 58

0,6 0,6

80 80

115 120

281 296

73 73

1 1

92 92

125 132

319 349

85 85

1 1

105 105

140 147

364 389

98 98

1 1

6.3

179

Rod ends with a cylindrical section welding shank, steel/steel d 20 – 80 mm

B C1

dk d

l6 h2

45°

d5 d6 SC .. ES

d = 20 mm

Principal dimensions d

B d2 max

Angle of tilt

d ≥ 25 mm Basic load ratings dynamic static

Mass

Designation

C1 h2 a C C0 max

degrees

–

13,5

46,5

0,20

SC 20 ES

73,5

0,45

SC 25 ES

96,5

0,65

SC 30 ES

112

1,00

SC 35 ES

100

134

1,30

SC 40 ES

104

127

180

1,90

SC 45 ES

114

156

220

2,50

SC 50 ES

137

100

245

335

4,60

SC 60 ES

162

115

315

455

6,80

SC 70 ES

182

141

400

550

9,70

SC 80 ES

180

Dimensions d dk

d5 d6 max

l6 max

l7 min

r1 min

mm 20

0,3

35,5

0,6

40,7

0,6

104

0,6

118

0,6

132

0,6

150

0,6

173

199

105

237

6.4

181

Rod ends with a rectangular section welding shank, steel/steel d 20 – 80 mm

C1 B

dk d

SCF .. ES

Principal dimensions d

B d2 max

C1 max

h2 js13

Angle of tilt

Basic load ratings dynamic static

degrees

Mass

Designation

–

51,5

0,35

SCF 20 ES

56,5

65,5

0,53

SCF 25 ES

66,5

110

0,87

SCF 30 ES

183

1,55

SCF 35 ES

102

36,5

100

285

2,45

SCF 40 ES

112

41,5

127

360

3,40

SCF 45 ES

125,5

41,5

156

415

4,45

SCF 50 ES

142,5

51,5

100

245

530

7,00

SCF 60 ES

166,5

115

315

680

10,0

SCF 70 ES

182,5

141

400

750

15,0

SCF 80 ES

228,5

150

490

1 290

23,5

SCF 90 ES

100

252,5

170

610

1 430

31,5

SCF 100 ES

110

298

185

655

2 200

48,0

SCF 110 ES

120

363

92,5

210

950

3 250

79,5

SCF 120 ES

182

Dimensions d dk

l6 max

r1 min

mm 20

0,3

35,5

73,5

0,6

40,7

0,6

103,5

0,6

120

0,6

133

0,6

151

0,6

171,5

198,5

105

232,5

115

264,5

100

130

296,5

110

140

334

120

160

391,5

6.5

183

Rod ends with a female thread, steel/bronze d 5 – 30 mm B C1

dk d

l7 l4 h1 l3 l5 d3 d4

G w SI(L)KAC .. M(/VZ019) d ≥ 6 mm

Principal dimensions Angle Basic load ratings Mass of tilt dynamic static G B C1 h1 a C C0 d d2 max 6H max

Designations Rod end with right-hand thread

degrees kN

–

19 19

M5 M 4

8 8

7,5 7,5

27 27

13 13

3,25 3,25

5,4 5,4

0,017 0,017

SIKAC 5 M1) SILKAC 5 M1) SIKAC 5 M/VZ0191) –

7,5

4,3

5,4

0,025

SIKAC 6 M

SILKAC 6 M

9,5

7,2

9,15

0,043

SIKAC 8 M

SILKAC 8 M

29 29

M 10 14 M 10¥1,25 14

11,5 11,5

43 43

13 13

10 10

12,2 12,2

0,072 0,072

SIKAC 10 M SILKAC 10 M SIKAC 10 M/VZ019 –

33 33

M 12 16 M 12¥1,25 16

12,5 12,5

50 50

13 13

13,4 13,4

14 14

0,11 0,11

SIKAC 12 M SILKAC 12 M SIKAC 12 M/VZ019 –

M 14

14,5

20,4

0,16

SIKAC 14 M

43 43

M 16 M 16¥1,5

21 21

15,5 15,5

64 64

15 15

21,6 21,6

29 29

0,22 0,22

SIKAC 16 M SILKAC 16 M SIKAC 16 M/VZ019 –

M 18¥1,5

17,5

35,5

0,30

SIKAC 18 M

SILKAC 18 M

M 20¥1,5

18,5

31,5

35,5

0,40

SIKAC 20 M

SILKAC 20 M

M 22¥1,5

0,50

SIKAC 22 M

SILKAC 22 M

M 24¥2

47,5

0,65

SIKAC 25 M

SILKAC 25 M

71 71

M 30¥2 M 27¥2

37 37

27 27

110 110

17 17

64 64

69,5 69,5

1,15 1,15

SIKAC 30 M SILKAC 30 M SIKAC 30 M/VZ019 –

1) No relubrication facilities.

184

left-hand thread

SILKAC 14 M

Dimensions d dk

d3 ª

d4 max

l3 min

l4 max

l5 ª

l7 min

r1 min

w h14

9 9

12 12

8 10

38 38

4 4

9 9

0,3 0,3

9 9

mm 5

11,1 11,1

12,7

0,3

15,8

12,5

0,3

19 19

15 15

20 20

15 20

59 59

6,5 6,5

14 14

0,3 0,3

17 17

22,2 22,2

17,5 17,5

23 23

18 22

68 68

6,5 6,5

16 16

0,3 0,3

19 19

25,4

0,3

28,5 28,5

22 22

29 29

24 28

87 87

8 8

21 21

0,3 0,3

22 22

31,7

0,3

34,9

27,5

105

0,3

38,1

114

0,3

42,8

33,5

127

0,3

50,8 50,8

40 40

52 52

45 51

148 148

15 15

35 35

0,3 0,3

41 41

6.6

185

Rod ends with a male thread, steel/bronze d 5 – 30 mm B C1

dk d

r1 I2 h l1

G SA(L)KAC .. M d ≥ 6 mm Principal dimensions Angle Basic load ratings Mass of tilt dynamic static G B C 1 h a C C0 d d2 max 6g max

Designations Rod end with right-hand thread

–

degrees kN

left-hand thread

M 5

3,25

4,8

0,013

SAKAC 5 M1)

SALKAC 5 M1)

M 6

6,75

4,3

4,8

0,020

SAKAC 6 M

SALKAC 6 M

M 8

7,2

0,032

SAKAC 8 M

SALKAC 8 M

M 10

10,5

10,8

0,054

SAKAC 10 M

SALKAC 10 M

M 12

12,2

0,085

SAKAC 12 M

SALKAC 12 M

M 14

13,5

17,3

0,13

SAKAC 14 M

SALKAC 14 M

M 16

21,6

23,2

0,19

SAKAC 16 M

SALKAC 16 M

M 18¥1,5

16,5

0,26

SAKAC 18 M

SALKAC 18 M

M 20¥1,5

0,34

SAKAC 20 M

SALKAC 20 M

M 22¥1,5

0,44

SAKAC 22 M

SALKAC 22 M

M 24¥2

46,5

0,60

SAKAC 25 M

SALKAC 25 M

M 30¥2

110

1,05

SAKAC 30 M

SALKAC 30 M

1) No relubrication facilities.

186

Dimensions d dk

l1 min

l2 max

r1 min

mm 5

11,1

0,3

12,7

0,3

15,8

0,3

22,2

0,3

25,4

0,3

28,5

0,3

31,7

0,3

34,9

106

0,3

38,1

114

0,3

42,8

127

0,3

50,8

148

0,3

6.7

187

Maintenance-free rod ends

Dimensions...................................................................................................................................... Tolerances........................................................................................................................................ Radial internal clearance, preload.................................................................................................. Materials.......................................................................................................................................... Permissible operating temperature range..................................................................................... Fatigue strength..............................................................................................................................

190 191 191 192 192 192

Product tables......................................................................................................... 7.1 Maintenance-free rod ends with a female thread, steel/PTFE sintered bronze ................. 7.2 Maintenance-free rod ends with a male thread, steel/PTFE sintered bronze...................... 7.3 Maintenance-free rod ends with a female thread, steel/PTFE fabric .................................. 7.4 Maintenance-free rod ends with a male thread, steel/PTFE fabric ..................................... 7.5 Maintenance-free rod ends with a female thread, steel/PTFE FRP..................................... 7.6 Maintenance-free rod ends with a male thread, steel/PTFE FRP.........................................

194 194 196 198 200 202 204

189

Maintenance-free rod ends SKF manufactures maintenance-free rod ends with three different sliding contact surface combinations in different series:

Fig. 1 Maintenance-free rod end, steel/PTFE sintered bronze

• Steel/PTFE sintered bronze († fig. 1): – SI(L) .. C series – SA(L) .. C series • Steel/PTFE fabric († fig. 2): – SI(L) .. TXE-2LS series – SI(L)A .. TXE-2LS series – SA(L) .. TXE-2LS series – SA(L)A .. TXE-2LS series • Steel/PTFE FRP († fig. 3): – SI(L)KB .. F series – SA(L)KB .. F series Rod ends with either a steel/PTFE sintered bronze or steel/PTFE fabric sliding contact surface combination contain a bearing from the standard assortment. The outer ring is staked in place in the housing. Rod ends with a steel/PTFE FRP sliding contact surface combination consist of a rod end housing and a spherical plain bearing inner ring. Between the housing and the inner ring, a sliding layer of fibre reinforced polymer, containing PTFE, is moulded to the housing. SKF supplies maintenance-free rod ends with a threaded shank with a right-hand thread as standard. With the exception of rod ends with the designation suffix VZ019, all rod ends are also available with a left-hand thread. They are identified by the designation prefix L.

Fig. 2 Maintenance-free rod end, steel/PTFE fabric

Dimensions The dimensions of SKF maintenance-free rod ends are in accordance with ISO 12240-4:1998. Male and female threads of SKF rod ends are in accordance with ISO 965-1:1998, except for rod ends with female thread having the designation suffix /VZ019, which is in accordance with ISO 8139:2009.

190

Fig. 3 Maintenance-free rod end, steel/PTFE FRP

Tolerances

Table 2

SKF rod end inner ring dimensional tolerances are in accordance with ISO 12240-1:1998. The tolerances are listed in table 1. The symbols used in table 1 are explained in the following: d nominal bore diameter Ddmp deviation of the mean bore diameter from the nominal DBs deviation of the single inner ring width from the nominal

Radial internal clearance, preload Depending on their design, SKF maintenancefree rod ends may have a radial internal clearance or a light preload. Table 2 lists maximum values for the radial internal clearance as well as for the frictional moment in the circumferential direction caused by preload.

Radial internal clearance and frictional moment for maintenance-free rod ends Bore diameter d over incl.

Radial internal clearance max

Frictional moment

µm

max

Sliding surface steel/PTFE sintered bronze (designation suffix C) – 12 20

12 20 30

28 35 44

0,15 0,25 0,40

Sliding surface steel/PTFE fabric (designation suffix TXE-2LS) 35

–

Sliding surface steel/PTFE FRP (designation suffix F) 5 6 8

50 50 50

0,20 0,25 0,30

10 12 14

75 75 75

0,40 0,50 0,60

16 18 20

75 85 100

0,70 0,80 1

100

1,2

Table 1 Inner ring dimensional tolerances for maintenance-free rod ends Bore diameter d over incl.

SA(A) and SI(A) series Ddmp DBs high low high low

SAKB and SIKB series Ddmp DBs high low high low

µm

– 6 10

6 10 18

0 0 0

–8 –8 –8

0 0 0

–120 –120 –120

12 15 18

0 0 0

–120 –120 –120

18 30 50

30 50 80

0 0 0

–10 –12 –15

0 0 0

–120 –120 –150

21 _ _

0 _ _

–120 _ _

191

Maintenance-free rod ends

Materials SKF rod end housings for maintenance-free bearings are made of materials as listed in table 3. Details of the materials used for the mainten ance-free radial spherical plain bearings incorporated in the rod ends are listed in table 3 on pages 128 to 129. The inner ring of rod ends with a steel/PTFE FRP sliding contact surface combination is made of bearing steel. The ring is through-hardened and ground. The sliding contact surface of the inner ring is hard chromium plated. The sliding layer consists of a fibre reinforced polymer, containing PTFE.

Table 3 Housing materials for maintenance-free rod ends Series

Size

Material

Material No.

SA(A) 6 to 80 SI(A)

Heat treatable steel C45V, zinc coated and chromatized

1.0503

SAKB 5 to 12 SIKB 14 to 22

Free-machining steel, 1.0718 zinc coated and chromatized Heat treatable steel C35N, zinc coated and chromatized

1.0501

Permissible operating temperature range The permissible operating temperature range for SKF maintenance-free rod ends depends on the rod end housing, the incorporated bearing and the bearing seals. The values for the permissible operating temperature range are listed in table 4. The load carrying capacity of the rod end is reduced at temperatures above 100 °C. For temperatures below 0 °C, check to be sure that the fracture toughness of the rod end housing is adequate for the intended application.

Fatigue strength

Table 4 Permissible operating temperature range for maintenance-free rod ends Rod end sliding contact surface combination

Permissible operating temperature range1)

Reduced load carrying capacity

from

–

°C

Steel/PTFE sintered bronze

–50

+150

+80

Steel/PTFE fabric –40

+110

+65

Steel/PTFE FRP

+75

+50

–40

incl.

toughness of the rod end housing is adequate for the intended application.

192

193

Maintenance-free rod ends with a female thread, steel/PTFE sintered bronze d 6 – 30 mm B C1

dk d

l4 h1

l5 d4

G w SI(L) .. C

Principal dimensions Angle Basic load ratings Mass of tilt dynamic static G B C1 h1 a C C0 d d2 max 6H max

Designations Rod end with right-hand left-hand thread thread

degrees kN

–

M 6

4,5

3,6

8,15

0,023

SI 6 C

SIL 6 C

M 8

6,5

5,8

12,9

0,036

SI 8 C

SIL 8 C

M 10

7,5

8,65

0,065

SI 10 C

SIL 10 C

M 12

8,5

11,4

25,5

0,11

SI 12 C

SIL 12 C

M 14

10,5

37,5

0,18

SI 15 C

SIL 15 C

M 16

11,5

22,4

46,5

0,25

SI 17 C

SIL 17 C

M 20¥1,5

13,5

31,5

0,35

SI 20 C

SIL 20 C

M 24¥2

0,65

SI 25 C

SIL 25 C

M 30¥2

110

65,5

118

1,05

SI 30 C

SIL 30 C

194

Dimensions d dk

d4 ª

l3 min

l4 max

l5 ª

l7 min

r1 min

w h14

mm 6

0,3

106

0,3

35,5

128

0,6

40,7

149

0,6

7.1

195

Maintenance-free rod ends with a male thread, steel/PTFE sintered bronze d 6 – 30 mm B C1

dk d

l2 h

G SA(L) .. C

Principal dimensions Angle Basic load ratings Mass of tilt dynamic static G B C1 h a C C0 d d2 max 6g max

Designations Rod end with right-hand left-hand thread thread

–

degrees

M 6

4,5

3,6

8,15

0,017

SA 6 C

SAL 6 C

M 8

6,5

5,85

12,9

0,030

SA 8 C

SAL 8 C

M 10

7,5

8,65

18,3

0,053

SA 10 C

SAL 10 C

M 12

8,5

11,4

24,5

0,078

SA 12 C

SAL 12 C

M 14

10,5

34,5

0,13

SA 15 C

SAL 15 C

M 16

11,5

22,4

42,5

0,19

SA 17 C

SAL 17 C

M 20¥1,5

13,5

31,5

0,32

SA 20 C

SAL 20 C

M 24¥2

0,57

SA 25 C

SAL 25 C

M 30¥2

110

65,5

104

0,90

SA 30 C

SAL 30 C

196

Dimensions d dk

l1 min

l2 max

l7 min

r1 min

mm 6

0,3

107

0,3

35,5

128

0,6

40,7

149

0,6

7.2

197

Maintenance-free rod ends with a female thread, steel/PTFE fabric d 35 – 80 mm B C1

dk d

l4 h1

l5 d4

G w SI(L) .. TXE-2LS

SI(L)A .. TXE-2LS

Principal dimensions Angle Basic load ratings1) Mass of tilt dynamic static G B C1 h1 a C C0 d d2 max 6H max

Designations Rod end with right-hand thread

degrees kN

–

M 36¥3

130

224

134

1,40

SI 35 TXE-2LS

94 94

M 39¥3 M 42¥3

28 28

24 24

142 145

7 7

280 280

166 166

2,20 2,30

SIA 40 TXE-2LS SILA 40 TXE-2LS SI 40 TXE-2LS SIL 40 TXE-2LS

104 104

M 42¥3 M 45¥3

32 32

28 28

145 165

7 7

360 360

224 224

2,90 3,20

SIA 45 TXE-2LS SILA 45 TXE-2LS SI 45 TXE-2LS SIL 45 TXE-2LS

114 114

M 45¥3 M 52¥3

35 35

31 31

160 195

6 6

440 440

270 270

4,10 4,50

SIA 50 TXE-2LS SILA 50 TXE-2LS SI 50 TXE-2LS SIL 50 TXE-2LS

137 137

M 52¥3 M 60¥4

44 44

39 39

175 225

6 6

695 695

400 400

6,30 7,10

SIA 60 TXE-2LS SILA 60 TXE-2LS SI 60 TXE-2LS SIL 60 TXE-2LS

162

M 72¥4

265

880

530

10,5

SI 70 TXE-2LS

SIL 70 TXE-2LS

182

M 80¥4

295

1 140

655

19,0

SI 80 TXE-2LS

SIL 80 TXE-2LS

left-hand thread

SIL 35 TXE-2LS

1) Dynamic load rating of the bearing to be used for basic rating life calculation only. Check suitability of the rod end against its static

load rating in all cases. The dynamic load applied on the rod end must not exceed its static load rating.

198

Dimensions d dk

d4 ª

l3 min

l4 max

l5 ª

l7 min

r1 min

w h14

mm 35

174

0,6

53 53

58 58

65 65

191 194

25 25

46 46

0,6 0,6

50 50

60 60

65 65

199 219

30 30

50 50

0,6 0,6

55 55

66 66

70 70

68 68

219 254

30 30

58 58

0,6 0,6

60 60

80 80

82 82

70 70

246 296

35 35

73 73

1 1

70 70

349

105

389

7.3

199

Maintenance-free rod ends with a male thread, steel/PTFE fabric d 35 – 80 mm B C1

dk d l7

l2 h

G SA(L) .. TXE-2LS

SA(L)A .. TXE-2LS

Principal dimensions Angle Basic load ratings1) Mass of tilt dynamic static G B C1 h a C C0 d d2 max 6g max

Designations Rod end with right-hand thread

–

degrees kN

left-hand thread

M 36¥3

130

224

110

1,30

SA 35 TXE-2LS

94 94

M 39¥3 M 42¥3

28 28

24 24

150 145

6 6

280 280

140 140

1,85 1,90

SAA 40 TXE-2LS SALA 40 TXE-2LS SA 40 TXE-2LS SAL 40 TXE-2LS

SAL 35 TXE-2LS

104 104

M 42¥3 M 45¥3

32 32

28 28

163 165

7 7

360 360

200 200

2,45 2,55

SAA 45 TXE-2LS SALA 45 TXE-2LS SA 45 TXE-2LS SAL 45 TXE-2LS

114 114

M 45¥3 M 52¥3

35 35

31 31

185 195

6 6

440 440

245 245

3,30 3,90

SAA 50 TXE-2LS SALA 50 TXE-2LS SA 50 TXE-2LS SAL 50 TXE-2LS

137 137

M 52¥3 M 60¥4

44 44

39 39

210 225

6 6

695 695

360 360

5,70 6,25

SAA 60 TXE-2LS SALA 60 TXE-2LS SA 60 TXE-2LS SAL 60 TXE-2LS

162

M 72¥4

265

880

490

10,0

SA 70 TXE-2LS

SAL 70 TXE-2LS

182

M 80¥4

295

1 140

585

14,5

SA 80 TXE-2LS

SAL 80 TXE-2LS

1) Dynamic load rating of the bearing to be used for basic rating life calculation only. Check suitability of the rod end against its static

load rating in all cases. The dynamic load applied on the rod end must not exceed its static load rating.

200

Dimensions d dk

l1 min

l2 max

l7 min

r1 min

mm 35

174

0,6

53 53

86 90

199 194

46 46

0,6 0,6

60 60

92 95

217 219

50 50

0,6 0,6

66 66

104 110

244 254

58 58

0,6 0,6

80 80

115 120

281 296

73 73

1 1

132

349

105

147

389

7.4

201

Maintenance-free rod ends with a female thread, steel/PTFE FRP d 5 – 22 mm B C1

dk d

l4 h1

l3 l5 d3 d4

G w SI(L)KB .. F

Principal dimensions Angle Basic load ratings Mass of tilt dynamic static G B C1 h1 a C C0 d d2 max 6H max

Designations Rod end with right-hand thread

–

degrees

left-hand thread

3,25

5,3

0,019

SIKB 5 F

SILKB 5 F

6,75

4,25

6,8

0,028

SIKB 6 F

SILKB 6 F

7,1

11,4

0,047

SIKB 8 F

SILKB 8 F

29 29

M 10 14 M 10¥1,25 14

10,5 10,5

43 43

13 13

9,8 9,8

14,3 14,3

0,079 0,079

SIKB 10 F SILKB 10 F SIKB 10 F/VZ019 –

33 33

M 12 16 M 12¥1,25 16

12 12

50 50

13 13

13,2 13,2

17 17

0,12 0,12

SIKB 12 F SILKB 12 F SIKB 12 F/VZ019 –

M 14

13,5

27,5

0,16

SIKB 14 F

43 43

M 16 M 16¥1,5

21 21

15 15

64 64

15 15

21,4 21,4

34,5 34,5

0,23 0,23

SIKB 16 F SILKB 16 F SIKB 16 F/VZ019 –

SILKB 14 F

M 18¥1,5

16,5

41,5

0,33

SIKB 18 F

SILKB 18 F

M 20¥1,5

0,38

SIKB 20 F

SILKB 20 F

M 22¥1,5

0,52

SIKB 22 F

SILKB 22 F

202

Dimensions d dk

d3 ª

d4 max

l3 min

l4 max

l5 ª

l7 min

r1 min

w h14

mm 5

11,1

0,3

12,7

0,3

15,8

12,5

0,3

19 19

15 15

20 20

15 20

58 58

6,5 6,5

14 14

0,3 0,3

17 17

22,2 22,2

17,5 17,5

23 23

18 22

67 67

6,5 6,5

16 16

0,3 0,3

19 19

25,4

0,3

28,5 28,5

22 22

29 29

24 28

86 86

8 8

21 21

0,3 0,3

22 22

31,7

0,3

34,9

27,5

103

0,3

38,1

114

0,3

7.5

203

Maintenance-free rod ends with a male thread, steel/PTFE FRP d 5 – 22 mm B C1

dk d

r1 l2 h l1

G SA(L)KB ..F

Principal dimensions Angle Basic load ratings Mass of tilt dynamic static G B C1 h a C C0 d d2 max 6g max

Designations Rod end with right-hand thread

degrees kN

–

M 5

3,25

5,3

0,015

SAKB 5 F

SALKB 5 F

M 6

6,75

4,25

6,8

0,021

SAKB 6 F

SALKB 6 F

M 8

7,1

0,035

SAKB 8 F

SALKB 8 F

M 10

10,5

9,8

12,5

0,059

SAKB 10 F

SALKB 10 F

M 12

13,2

0,10

SAKB 12 F

SALKB 12 F

M 14

13,5

25,5

0,13

SAKB 14 F

SALKB 14 F

M 16

21,4

34,5

0,20

SAKB 16 F

SALKB 16 F

M 18¥1,5

16,5

41,5

0,26

SAKB 18 F

SALKB 18 F

M 20¥1,5

0,37

SAKB 20 F

SALKB 20 F

M 22¥1,5 28

58,5

0,46

SAKB 22 F

SALKB 22 F

204

left-hand thread

Dimensions d dk

l1 min

l2 max

r1 min

mm 5

11,1

0,3

12,7

0,3

15,8

0,3

22,2

0,3

25,4

0,3

28,5

0,3

31,7

0,3

34,9

106

0,3

38,1

114

0,3

7.6

205

Other SKF plain bearings and special solutions Spherical plain bearings for road vehicles..................................................................................... Plain bearings for railway vehicles................................................................................................. Bushing units for off highway vehicles........................................................................................... Spherical plain bearings and rod ends for the aircraft industry.................................................... Bushings, thrust washers and strips.............................................................................................. Rod ends for the food industry.......................................................................................................

208 208 208 209 209 210

207

Other SKF plain bearings and special solutions

Spherical plain bearings for road vehicles SKF spherical plain bearings or bearing units are also available for special applications. Therefore, SKF works closely with the customer to develop customized products, e.g. solutions for centring propeller shafts or gear shifts.

Plain bearings for railway vehicles The SKF assortment of plain bearings for railway vehicles includes bogie swivel bearings for trams and heavy-duty goods wagons as well as spherical plain bearings and rod ends for transverse stabilizers, tilting mechanisms etc.

Bushing units for off-highway vehicles Many off-highway vehicles have bushings made of steel or bronze that require relubrication. SKF has developed state-of-the-art bushing units with seals. As these units do not require grease, costs are reduced and product足ivity is increased.

208

Spherical plain bearings and rod ends for the aircraft industry SKF supplies a wide assortment of special spherical plain bearings and rod ends in various designs and materials for aerospace applications worldwide. The main applications are airframe bearings for the transmission of rotating, tilting and oscillating movements as used in undercarriages, spoilers, height and side rudders, wing flaps etc.

Bushings, thrust washers and strips SKF offers a wide assortment of bushings available from stock. Bushings are suitable for rotating, oscillating and linear movements and are available as cylindrical or flanged designs. Thrust washers are intended for applications where axial space is limited, maintenance is not possible and where lubricant starvation can occur. SKF also supplies strips made of the same materials as thrust washers. They can be bent, pressed or coined to form flat linear guides, e.g. L-shaped or V-shaped profiles, or other types of dry sliding components. Different materials meet different requirements: • solid bronze, the traditional robust material • sintered bronze with oil impregnation, for high sliding velocities • wrapped bronze with lubrication pockets, for contaminated environments • PTFE composite with reduced friction, for long service life • POM composite, for minimal maintenance under arduous conditions • PTFE polyamide, cost-effective and maintenance-free • filament wound, for extreme conditions

209

Other SKF plain bearings and special solutions

Rod ends for the food industry The food and beverage processing industries have unique requirements. Depending on the application, equipment has to withstand the following influences: • hot, cold or wet environments • frequent wash downs • exposure to harsh cleaning agents • food and liquid contaminants • a variety of chemicals To deal with these challenging operating conditions, SKF offers rod ends with a stainless steel housing or with a composite housing. Both series are equipped with a stainless steel inner ring and an injection moulded PTFE FRP dry sliding layer. The used materials provide the following properties: • corrosion resistant • good wear resistance • low friction • cost-effective

210

211

Product index

Designation Product GAC .. F. . . . . . . . . . . . . GE .. C. . . . . . . . . . . . . . GE .. CJ2. . . . . . . . . . . . GE .. E. . . . . . . . . . . . . . GE .. ES. . . . . . . . . . . . . GE .. ES-2LS. . . . . . . . . GE .. ES-2RS. . . . . . . . . GE .. TXA-2LS. . . . . . . . GE .. TXE-2LS. . . . . . . . GE .. TXG3A-2LS . . . . . GE .. TXG3E-2LS . . . . . GE .. TXGR. . . . . . . . . . . GEC .. FBAS. . . . . . . . . . GEC .. TXA-2RS. . . . . . GEG .. ES. . . . . . . . . . . . GEG .. ESA. . . . . . . . . . . GEH .. C. . . . . . . . . . . . . GEH .. ES-2LS . . . . . . . GEH .. ES-2RS. . . . . . . GEH .. TXA-2LS . . . . . . GEH .. TXE-2LS . . . . . . GEH .. TXG3A-2LS. . . . GEH .. TXG3E-2LS. . . . GEM .. ES-2LS GEM .. ES-2RS. . . . . . . GEP .. FS. . . . . . . . . . . . GEZ .. ES. . . . . . . . . . . . GEZ .. ES-2LS. . . . . . . . GEZ .. ES-2RS. . . . . . . GEZ .. TXA-2LS. . . . . . . GEZ .. TXE-2LS. . . . . . . GEZH .. ES . . . . . . . . . . GEZH .. ES-2LS . . . . . . GEZH .. ES-2RS. . . . . . GEZM .. ES . . . . . . . . . . GEZM .. ES-2LS. . . . . . GEZM .. ES-2RS. . . . . . GX .. F. . . . . . . . . . . . . . SA .. C. . . . . . . . . . . . . . SA .. E. . . . . . . . . . . . . . SA .. ES. . . . . . . . . . . . . SA .. ES-2RS. . . . . . . . . SA .. TXE-2LS. . . . . . . . SAA .. ES-2RS. . . . . . . . SAA .. TXE-2LS. . . . . . . SAKAC .. M . . . . . . . . . . SAKB .. F. . . . . . . . . . . . SAL .. C. . . . . . . . . . . . . SAL .. E. . . . . . . . . . . . .

Maintenance-free angular contact spherical plain bearings, steel/PTFE FRP . . . . . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE sintered bronze, metric sizes. . . Maintenance-free radial spherical plain bearings, steel/PTFE sintered bronze, metric sizes. . . Radial spherical plain bearings requiring maintenance, steel/steel, metric sizes. . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, metric sizes. . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, metric sizes. . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, metric sizes. . . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes. . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes. . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes. . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes. . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes. . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE FRP, metric sizes. . . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes. . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, with an extended inner ring, metric sizes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, with an extended inner ring, metric sizes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE sintered bronze, metric sizes. . . Radial spherical plain bearings requiring maintenance, steel/steel, metric sizes. . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, metric sizes. . . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes. . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes. . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes. . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE fabric, metric sizes. . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, with an extended inner ring, metric sizes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, with an extended inner ring, metric sizes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE FRP, metric sizes. . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, inch sizes. . . . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, inch sizes. . . . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, inch sizes. . . . . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE fabric, inch sizes. . . . . . . . . . . . Maintenance-free radial spherical plain bearings, steel/PTFE fabric, inch sizes. . . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, inch sizes. . . . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, inch sizes. . . . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, inch sizes. . . . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, with an extended inner ring, inch sizes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, with an extended inner ring, inch sizes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radial spherical plain bearings requiring maintenance, steel/steel, with an extended inner ring, inch sizes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free thrust spherical plain bearings, steel/PTFE FRP . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, male thread, steel/PTFE sintered bronze . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, male thread, steel/steel. . . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, male thread, steel/steel. . . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, male thread, steel/steel. . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, male thread, steel/PTFE fabric . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, male thread, steel/steel. . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, male thread, steel/PTFE fabric . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, male thread, steel/bronze. . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, male thread, steel/PTFE FRP . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, male thread, steel/PTFE sintered bronze . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, male thread, steel/steel. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Product Page table

4.1 3.1 3.1 2.1 2.1 2.1 2.1 3.2 3.2 3.2 3.2 3.2 3.4 3.2

156 132 132 104 104 104 104 134 134 134 134 134 144 134

2.3

116

2.3 3.1 2.1 2.1 3.2 3.2 3.2 3.2

116 132 104 104 134 134 134 134

2.3

116

2.3 3.4 2.2 2.2 2.2 3.3 3.3 2.2 2.2 2.2

116 144 110 110 110 140 140 110 110 110

2.4

120

2.4

120

120 164 196 178 178 178 200 178 200 186 204 196 178

2.4 5.1 7.2 6.3 6.3 6.3 7.4 6.3 7.4 6.7 7.6 7.2 6.3

213

Product index

Designation Product SAL .. ES. . . . . . . . . . . . SAL .. ES-2RS. . . . . . . . SAL .. TXE-2LS. . . . . . . SALA .. ES-2RS . . . . . . SALA .. TXE-2LS. . . . . . SALKAC .. M . . . . . . . . . SALKB .. F. . . . . . . . . . . SC .. ES. . . . . . . . . . . . . SCF .. ES. . . . . . . . . . . . SI .. C. . . . . . . . . . . . . . . SI .. E. . . . . . . . . . . . . . . SI .. ES. . . . . . . . . . . . . SI .. ES-2RS. . . . . . . . . SI .. TXE-2LS . . . . . . . . SIA .. ES-2RS. . . . . . . . SIA .. TXE-2LS . . . . . . . SIJ .. E. . . . . . . . . . . . . . SIJ .. ES. . . . . . . . . . . . . SIKAC .. M. . . . . . . . . . . SIKAC .. M/VZ019. . . . . SIKB .. F SIKB .. F/VZ019 SIL .. C. . . . . . . . . . . . . . SIL .. E. . . . . . . . . . . . . . SIL .. ES . . . . . . . . . . . . SIL .. ES-2RS. . . . . . . . SIL .. TXE-2LS . . . . . . . SILA .. ES-2RS. . . . . . . SILA .. TXE-2LS. . . . . . SILJ .. E. . . . . . . . . . . . . SILJ .. ES . . . . . . . . . . . SILKAC .. M. . . . . . . . . . SILKB .. F . . . . . . . . . . . SILQG .. ES. . . . . . . . . . SILQG .. ESA. . . . . . . . . SILR .. ES . . . . . . . . . . . SIQG .. ES. . . . . . . . . . . SIQG .. ESA. . . . . . . . . . SIR .. ES . . . . . . . . . . . .

214

Rod ends requiring maintenance, male thread, steel/steel. . . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, male thread, steel/steel. . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, male thread, steel/PTFE fabric . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, male thread, steel/steel. . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, male thread, steel/PTFE fabric . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, male thread, steel/bronze. . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, male thread, steel/PTFE FRP . . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, cylindrical section welding shank, steel/steel . . . . . . . . . . . Rod ends requiring maintenance, rectangular section welding shank, steel/steel . . . . . . . . . . Maintenance-free rod ends, female thread, steel/PTFE sintered bronze . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, female thread, steel/steel . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, female thread, steel/steel . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, female thread, steel/steel . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, female thread, steel/PTFE fabric . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, female thread, steel/steel . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, female thread, steel/PTFE fabric . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance for hydraulic cylinders, female thread, steel/steel . . . . . . . . Rod ends requiring maintenance for hydraulic cylinders, female thread, steel/steel . . . . . . . . Rod ends requiring maintenance, female thread, steel/bronze. . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, female thread, steel/bronze, thread differs from standard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, female thread, steel/PTFE FRP . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, female thread, steel/PTFE FRP, thread differs from standard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, female thread, steel/PTFE sintered bronze . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, female thread, steel/steel . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, female thread, steel/steel . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, female thread, steel/steel . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, female thread, steel/PTFE fabric . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance, female thread, steel/steel . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, female thread, steel/PTFE fabric . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance for hydraulic cylinders, female thread, steel/steel . . . . . . . . Rod ends requiring maintenance for hydraulic cylinders, female thread, steel/steel . . . . . . . . Rod ends requiring maintenance, female thread, steel/bronze. . . . . . . . . . . . . . . . . . . . . . . . Maintenance-free rod ends, female thread, steel/PTFE FRP . . . . . . . . . . . . . . . . . . . . . . . . . . Rod ends requiring maintenance for hydraulic cylinders, female thread, steel/steel . . . . . . . . Rod ends requiring maintenance for hydraulic cylinders, female thread, steel/steel . . . . . . . . Rod ends requiring maintenance for hydraulic cylinders, female thread, steel/steel . . . . . . . . Rod ends requiring maintenance for hydraulic cylinders, female thread, steel/steel . . . . . . . . Rod ends requiring maintenance for hydraulic cylinders, female thread, steel/steel . . . . . . . . Rod ends requiring maintenance for hydraulic cylinders, female thread, steel/steel . . . . . . . .

Product Page table

6.3 6.3 7.4 6.3 7.4 6.7 7.6 6.4 6.5 7.1 6.1 6.1 6.1 7.3 6.1 7.3 6.2 6.2 6.6

178 178 200 178 200 186 204 180 182 194 172 172 172 198 172 198 174 174 184

6.6 7.5

184 202

202 194 172 172 172 198 172 198 174 174 184 202 174 174 174 174 174 174

7.5 7.1 6.1 6.1 6.1 7.3 6.1 7.3 6.2 6.2 6.6 7.5 6.2 6.2 6.2 6.2 6.2 6.2

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