SKF - Spherical Plain Bearings and Rod Ends

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Design of bearing arrangements 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: • 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. Axial displacement ISO shaft and housing tolerance classes Fig. 5 Fig. 6 • 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 (Δ dmp ) and the bearing outside diameter deviations (Δ Dmp ) are listed in tables 3 and 4. + 0 + 0 H11 H7 J7 K7 M7 N7 g6 h6 k6 m6 n6 72
Shaft fits Operating conditions Tolerance classes Sliding contact surface combination steel/steel and steel/PTFE sintered bronze, steel/bronze steel/PTFE fabric and steel/PTFE FRP Table 1 1 Radial spherical plain bearings Loads of all kinds, interference fit m6 (n6) 1) k6 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) m6 Thrust spherical plain bearings Loads of all kinds, interference fit m6 (n6) m6 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. Housing fits Table 2 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 H7 H7 Heavy loads M7 (N7) K7 Light alloy housings N7 M7 Angular contact spherical plain bearings Loads of all kinds, interference fit M7 (N7) M7 Loads of all kinds, can generally be displaced axially J7 J7 Thrust spherical plain bearings Purely axial loads H11 H11 Combined loads J7 J7 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. 73
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SKF spherical plain bearings and ro
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Principles of selection and applica
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6 Rod ends requiring maintenance...
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Foreword Many applications require
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Unit conversions Quantity Unit Conv
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Evolving by-wire technology SKF has
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Maintaining a 350 km/h R&D lab In a
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General product information Propert
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General product information Bearing
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General product information Mainten
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General product information Multi-p
Page 24 and 25: General product information Dam gat
Page 27 and 28: Principles for selection and applic
Page 29 and 30: Selection of bearing type 1 Bearing
Page 31 and 32: Bearing design Radial spherical pla
Page 33 and 34: Bearing design Maintenance-free rad
Page 35 and 36: Angular contact spherical plain bea
Page 37 and 38: Bearing design Rod ends with a thre
Page 39 and 40: Maintenance-free rod ends with a th
Page 41 and 42: static load factor K 0 († table 4
Page 43 and 44: Combined load Fig. 6 Load When cons
Page 45 and 46: Angular contact spherical plain bea
Page 47 and 48: Requisite bearing size To determine
Page 49 and 50: For intermittent movement, the angl
Page 51 and 52: Diagram 8 pv diagrams for steel/PTF
Page 53 and 54: Basic rating life calculation Steel
Page 55 and 56: Diagram 14 Multiplication factor f
Page 57 and 58: Diagram 16 Temperature factor b 2 f
Page 59 and 60: Table 7 Load condition factor b 1 f
Page 61 and 62: Maintenance-free steel/PTFE FRP sli
Page 63 and 64: Variable load and sliding velocity
Page 65 and 66: Because this life is shorter than t
Page 67 and 68: 3. A 320-bar hydraulic cylinder on
Page 69 and 70: 4. Linkages of a conveyor installat
Page 71 and 72: Friction 1 The friction in a spheri
Page 73: For heavier loads a tighter interfe
Page 77 and 78: Axial location of bearings Locating
Page 79 and 80: Shaft and housing fillet dimensions
Page 81 and 82: Sealing Most bearing arrangements m
Page 83 and 84: Table 7 External seals for spherica
Page 85 and 86: Table 8 Recommended dimensions for
Page 87 and 88: Diagram 1 The SKF traffic light con
Page 89 and 90: SKF recommends using SKF LGHB 2 gre
Page 91 and 92: Rod ends requiring maintenance Stee
Page 93 and 94: 1 SKF has the appropriate greases f
Page 95 and 96: Plane of fracture or split and main
Page 97 and 98: Rod ends Rod ends are fitted on pin
Page 99: Fig. 3 Dismounting a bearing using
Page 102 and 103: Radial spherical plain bearings req
Page 104 and 105: Radial spherical plain bearings req
Page 106 and 107: Radial spherical plain bearings, st
Page 118 and 119: Radial spherical plain bearings wit
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Radial spherical plain bearings wit
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Maintenance-free radial spherical p
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Table 1 Dimensional tolerances for
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Table 3 Design of maintenance-free
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Table 6 Radial internal clearance f
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r a D a d a 3.1 Dimensions Abutment
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r a D a d a 3.2 GEH .. TX(G3)E-2LS
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r a d a 3.2 Dimensions Abutment and
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145 r a D a d a 3.4 Dimensions Abut
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147 r a D a d a 3.4 Dimensions Abut
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Angular contact spherical plain bea
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Angular contact spherical plain bea
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Maintenance-free angular contact sp
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Thrust spherical plain bearings Dim
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Materials Shaft and housing washers
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163 5
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d a r a r a D a Dimensions Abutment
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Rod ends requiring maintenance SKF
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Rod ends requiring maintenance Perm
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Rod ends with a female thread, stee
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Rod ends with a female thread, for
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Rod ends with a female thread, for
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Rod ends with a male thread, steel/
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Rod ends with a cylindrical section
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Rod ends with a rectangular section
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Rod ends with a female thread, stee
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Rod ends with a male thread, steel/
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Maintenance-free rod ends Dimension
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Tolerances SKF rod end inner ring d
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193 7
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Dimensions d d k d 4 l 3 l 4 l 5 l
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Dimensions d d k l 1 l 2 l 7 r 1 mi
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Dimensions d d k d 4 l 3 l 4 l 5 l
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Dimensions d d k l 1 l 2 l 7 r 1 mi
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Dimensions d d k d 3 d 4 l 3 l 4 l
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Dimensions d d k l 1 l 2 r 1 min ma
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Other SKF plain bearings and specia
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Other SKF plain bearings and specia
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Product index Designation Product P
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SKF - Spherical Plain Bearings and Rod Ends

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