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SKF Spherical Plain Bearings and Rod Ends Contents SKF spherical plain bearings and rod ends SKF spherical plain bearings and rod ends Contents The SKF brand now stands for more than ever before, 1 Product information ................................................ 4 and means more to you as a valued customer. Where self-alignment is called for................................ 4 When flexibility pays ...................................................... 6 While SKF maintains its leadership as the hallmark of An incomparable range ................................................. 9 quality bearings throughout the world, new dimensions Multi-purpose performance .......................................... 12 in technical advances, product support and services have evolved SKF into a truly solutions-oriented supplier, 2 Recommendations .................................................. 16 creating greater value for customers. Selection of bearing size ............................................... 16 These solutions encompass ways to bring greater Load ratings................................................................. 16 productivity to customers, not only with breakthrough Basic rating life ............................................................ 17 application-specific products, but also through leading- Load............................................................................. 18 edge design simulation tools and consultancy services, Equivalent dynamic bearing load ............................ 18 plant asset efficiency maintenance programs, and the Equivalent static bearing load ................................. 20 industry’s most advanced supply management Permissible loads for rod ends................................ 20 techniques. Requisite bearing size.................................................. 21 Specific bearing load............................................... 21 The SKF brand still stands for the very best in rolling Mean sliding velocity ............................................... 21 bearings, but it now stands for much more. Basic rating life ............................................................ 24 Sliding contact surface combinations SKF – The knowledge engineering company requiring maintenance: steel-on-steel and steel-on-bronze ....................................................... 24 Maintenance-free sliding contact surface combination steel/sinter bronze composite ............ 26 Maintenance-free sliding contact surface combination steel/PTFE fabric ................................ 27 Maintenance-free sliding contact surface combination steel/PTFE composite ........................ 29 Variable load and sliding velocity ............................ 30 Calculation examples................................................... 30 Friction ............................................................................ 35 Application of bearings.................................................. 36 Radial location of bearings .......................................... 36 Axial location of bearings............................................. 40 Sealing ......................................................................... 43 Designing the bearing arrangement for easy mounting and dismounting .......................................... 46 Lubrication...................................................................... 48 Spherical plain bearings requiring maintenance.......... 48 Maintenance-free spherical plain bearings.................. 48 Rod ends requiring maintenance................................. 50 Maintenance-free rod ends.......................................... 50 Maintenance ................................................................... 51 Mounting ......................................................................... 52 Spherical plain bearings ............................................. 52 Rod ends ..................................................................... 54 Dismounting.................................................................... 55 Spherical plain bearings ............................................. 55 Rod ends ..................................................................... 55 2 3 Product data ............................................................ 57 Product information . 4 Radial spherical plain bearings 1 requiring maintenance .................................................. 58 General ....................................................................... 58 Steel-on-steel spherical plain bearings with metric dimensions............................................ 62 Recommendations . 16 with inch dimensions............................................... 66 2 with extended inner ring.......................................... 70 Maintenance-free radial spherical plain bearings ...... 72 General ....................................................................... 72 Bearings with sliding contact surface combination Product data . 57 steel/sinter bronze composite ................................ 76 3 steel/PTFE fabric ..................................................... 78 steel/PTFE composite ............................................ 82 Angular contact spherical plain bearings .................... 86 Radial spherical plain bearings General ........................................................................ 86 requiring maintenance . 58 Maintenance-free bearings with sliding contact 3.1 surface combination steel/PTFE composite ............... 90 Spherical plain thrust bearings ..................................... 92 General ........................................................................ 92 Maintenance-free radial spherical Maintenance-free bearings with sliding contact plain bearings . 72 surface combination steel/PTFE composite................ 94 3.2 Rod ends requiring maintenance ................................. 96 General ....................................................................... 96 Steel-on-steel rod ends with female thread ...................................................100 Angular contact spherical plain bearings . 86 with female thread for hydraulic cylinders ..............102 3.3 with male thread .....................................................104 with cylindrical section welding shank ....................106 with rectangular section welding shank .................108 Steel-on-bronze rod ends Spherical plain thrust bearings . 92 with female thread ...................................................110 3.4 with male thread .....................................................112 Maintenance-free rod ends ...........................................114 General ........................................................................114 Maintenance-free rod ends Rod ends requiring maintenance . 96 with female thread, steel/sinter bronze composite 118 3.5 with male thread, steel/sinter bronze composite ....120 with female thread, steel/PTFE fabric .....................122 with male thread, steel/PTFE fabric ........................124 with female thread, steel/PTFE composite..............126 Maintenance-free rod ends . 114 with male thread, steel/PTFE composite ................128 3.6 Special solutions and related products........................130 Plain bearings for road vehicles ..................................130 Plain bearings for rail vehicles ....................................130 Spherical plain bearings and rod ends for Special solutions and related products . 130 airframe applications ..................................................131 3.7 Dry sliding bushings and flanged bushings.................132 Dry sliding thrust washers and strip ...........................133 SKF – The knowledge engineering company .........134 3 1 Product information 2 Recommendations 3 Product data User benefits Page .............. 16 Page .............. 57 Where self-alignment is called for Spherical plain bearings Spherical plain bearings are standard- ized, ready-to-mount mechanical com- ponents that are self-aligning and en- able multi-directional alignment move- ments to be made. The inner ring has a sphered convex outside diameter and the outer ring a correspondingly sphered but concave inside surface ➔ Operational reliability is high even when Misalignment is not a problem for ( fig 1 ). The forces acting on the a design is made more compact – edge spherical plain bearings bearing may be static or may occur stresses and overloading do not occur when the bearing makes oscillating or recurrent tilting and slewing move- ments at relatively low speeds. The advantages inherent in the de- sign of spherical plain bearings mean that in practice • errors of alignment or angular mis- alignment do not influence bearing life • deformation of surrounding compo- nents in operation has no effect • edge stresses and excessive stress- ing of adjacent components do not occur • operational reliability of lightweight constructions is enhanced • reasonably wide manufacturing tolerances allow the use of cost- favourable welded constructions Fig 1 Spherical plain bearing 1 1 Outer ring 2 2 Sliding contact 3 surfaces 4 3 Seal 5 4 Inner ring 6 5 Lubrication hole 6 Lubrication groove 4 1 Product information 2 Recommendations 3 Product data User benefits Page .............. 16 Page .............. 57 1 Rod ends Rod ends are bearing units that con- sist of a spherical plain bearing in an eye-shaped head with integral shank: the rod end housing (➔ fig 2 ). They are used primarily on the ends of pis- ton rods or together with hydraulic as well as pneumatic
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