NTN - Large Bearings

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Bearing Fits 4.3.2 Recommended Fits Bearing fit is governed by the selection tolerances for bearing shaft diameters and housing bore diameters. Widely used fits for 0 Class tolerance bearings and various shaft and housing bore diameter tolerances are shown in Fig. 4.1. Generally-used, standard fits for most types of bearings and operating conditions are shown in Tables 4.2 - 4.6. Table 4.2: Fits for radial bearings Table 4.3: Fits for thrust bearings Table 4.4: Fits for electric motor bearings Table 4.5: Fits for inch series tapered roller bearings (ANSI Class 4) Table 4.6: Fits for inch series tapered roller bearings (ANSI Class 3 and 0) Table 4.5. shows fits and their numerical values. For special fits or applications, please consult <strong>NTN</strong> Engineering. 4.3.3 Interference minimum and maximum values The following points should be considered when it is necessary to calculate the interference for an application: ¡In calculating the minimum required amount of interference keep in mind that: 1) interference is reduced by radial loads 2) interference is reduced by differences between bearing temperature and ambient temperature 3) interference is reduced by variation of fitted surfaces ¡Maximum interference should be no more than 1:1000 of the shaft diameter or outer diameter. Required interference calculations are shown below. (1) Radial loads and required interference Interference between inner rings mounted on solid shafts is reduced when acted upon by radial loads. Calculation of the minimum required amount of interference in such cases is shown in formulae (4.1) and (4.2). Fr 0.3 Cor ∆ dF 0.08 (dFr / B) 1/2 N 0.25 (dFr / B) 1/2 kgf (4.1) Fr 0.3 Cor ∆ dF 0.02 (Fr / B) N 0.2 (Fr / B) kgf (4.2) Where, ∆ dF : Required effective interference for load m d : Nominal bore diameter mm B : Inner ring width mm Fr : Radial load Nkgf Cor : Basic static rated load Nkgf shown in formulae (4.3). ∆ dT = 0.0015 d ∆T (4.3) ∆ dT : Required effective interference for temperature difference m ∆T : Difference between bearing temperature and ambient temperature ˚C d : Bearing bore diameter mm (3) Fitted surface variation and required interference Interference between fitted surfaces is reduced by roughness and other slight variations of these surfaces which are flattened in the fitting process. The degree of reduced interference depends upon the finish treatment of these surfaces, but in general it is necessary to assume the following interference reductions. For ground shafts: 1.02.5m For lathed shafts: 5.07.0m (4) Maximum interference When bearing rings are installed with an interference fit, tension or compression stress may occur along their raceways. If interference is too great, this may cause damage to the rings and reduce bearing life. For these reasons, maximum interference should not exceed the previously mentioned ratio of 1:1,000 of shaft or outside diameter. 4.3.4 Other details (1) Tight interference fits are recommended for, ¡Operating conditions with large vibration or shock loads ¡Applications using hollow shafts or housings with thin walls ¡Applications using housings made of light alloys or plastic (2) Loose interference fits are preferable for, ¡Applications requiring high running accuracy ¡Applications using small sized bearings or thin walled bearings Class 0 ∆Dmp G6 G7 H8 H7 H6 Loose fit Transition fit J6 J7 K6 K7 Types of fits Housing Transition fit M6 M7 N6 N7 P6 P7 Tight fit Tight fit (2) Temperature difference and required interference Interference between inner rings and steel shafts is reduced as a result of temperature increases (difference between bearing temperature and ambient temperature, ∆T) caused by bearing rotation. Calculation of the minimum required amount of interference in such cases is n5 n6 m5 m6 k5 k6 Class 0 J5 J6 ∆dmp h5 h6 g5 g6 Shafts Fig. 4.1 p6 A-23
Bearing Fits (3) Consideration must also be given to the fact that fit selection will affect internal bearing clearance selection. (refer to page insert A-29) (4) A particular type of fit is recommended for SL type cylindrical roller bearings. Table 4.2 General standards for radial bearing fits (JIS Class 0, 6, 6X) Table 4.2 (1) Tolerance class of shafts commonly used for radial bearings (classes 0, 6X and 6) Load conditions, magnitude Ball bearing Load Nature conditions, of load Fit Shaft diameter magnitude mm over incl Tolerance class Cylindrical roller bearing Tapered roller bearing Shaft diameter mm over incl Tolerance class Self-aligning roller bearings Shaft diameter mm over incl Tolerance class Remarks Indeterminate direction load Rotating inner ring load Tight fit / Transition fit 1 Light or fluctuating variable load 1 Normal load 1 Heavy load or shock load 18 100 100 200 18 100 140 200 100 140 200 280 js6 k6 k5 m5 m6 n6 40 140 140 200 40 100 100 140 140 200 200 400 50 140 140 200 200 k6 m6 m5 m6 n6 p6 n6 p6 r6 40 65 65 100 100 140 140 280 280 500 50 100 100 140 140 200 m5 m6 n6 p6 r6 n6 p6 r6 When greater accuracy is required js5, k5, and m5 may be substituted for js6, k6, and m6. Alteration of inner clearances to accommodate fit is not a consideration with single-row angular contact bearings and tapered roller bearings. Therefore, k5 and m5 may be substituted for k6 and m6. Use bearings with larger internal clearances than CN clearance bearings. Static inner ring load Transition fit Inner ring axial displacement possible Inner ring axial displacement unnecessary All shaft diameters g6 h6 All shaft diameters g6 h6 All shaft diameters g6 h6 When greater accuracy is required use g5. For large bearings, f6 may be used. When greater accuracy is required use h5. Centric axial load only Transition fit All loads All shaft diameters js6 All shaft js6 All shaft js6 diameters diameters General; depending on the fit, shaft and inner rings are not fixed. Table 4.2 (2) Fit with shaft (fits for tapered bore bearings (Class 0) with adapter assembly/withdrawal sleeve) 2 All loads All bearing types All shaft diameters Tolerance h9 / IT5 General applications class 2 h10/ IT7 Transmission shafts, etc. 1 Standards for light loads, normal loads, and heavy loads Light loads: equivalent radial load 0.06Cr Normal loads: 0.06Cr equivalent radial load 0.12Cr Heavy loads: 0.12 Cr equivalent radial load 2 IT5 and IT7 show shaft roundness tolerances, cylindricity tolerances, and related values. Note: All values and fits listed in the above tables are for solid steel shafts. A-24
Page 1 and 2: For New Technology Network R corpor
Page 3 and 4: Warranty NTN warrants, to the origi
Page 5 and 6: A-2
Page 7 and 8: A-4
Page 9 and 10: Load Rating and Life n min -1 60,00
Page 11 and 12: Bearing Load Calculation 2. Bearing
Page 13 and 14: A-10A-30
Page 15 and 16: Bearing Tolerances Table 3.3 Tolera
Page 23 and 24: Bearing Tolerances 3.2 Limits and t
Page 25: Bearing Fits 4. Bearing Fits 4.1 In
Page 29 and 30: Bearing Fits Table 4.3 Standard fit
Page 31 and 32: Bearing Fits Table 4.6 Fits for inc
Page 33 and 34: Bearing Internal Clearance (1) Redu
Page 35 and 36: Bearing Internal Clearance Table 5.
Page 41 and 42: Lubrication 6. Lubrication 6.1 Lubr
Page 43 and 44: Lubrication 6.3.2 Base oil Natural
Page 45 and 46: Lubrication 6.5 Oil lubrication Oil
Page 47 and 48: Lubrication Table 6.9 Factor K Expe
Page 49 and 50: MEMO A-46
Page 51 and 52: INDEX OF BEARING TABLES Deep Groove
Page 53 and 54: Deep Groove Ball Bearings
Page 55 and 56: Deep Groove Ball Bearings D r B r d
Page 61 and 62: Deep Groove Ball Bearings r D B r d
Page 63 and 64: Angular Contact Ball Bearings
Page 65 and 66: Angular Contact Ball Bearings 1. 2
Page 67 and 68: Angular Contact Ball Bearings Singl
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Angular Contact Ball Bearings Singl
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Angular Contact Ball Bearings Singl
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Double Row Angular Contact Ball Bea
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Double Row Angular Contact Ball Bea
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Cylindrical Roller Bearings
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Cylindrical Roller Bearings Table 3
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Single Row Cylindrical Roller Beari
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Multi-Row Cylindrical Roller Bearin
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4-Row Cylindrical Roller Bearings C
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SL Type Cylindrical Roller Bearings
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Tapered Roller bearings
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Tapered Roller Bearings Table 2 Str
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Tapered Roller Bearings Inch system
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Tapered Roller Bearings Inch system
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Single Row Tapered Roller Bearings
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Double Row Tapered Roller Bearings
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Double Row Steep Slope Tapered Roll
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Four Row Tapered Roller Bearings C2
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Sealed Four Row Tapered Roller Bear
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Spherical Roller bearings
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Spherical Roller Bearings 2. Dimens
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Spherical Roller Bearings B r r D d
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Thrust bearings
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Thrust Bearings 1. 3 Tapered roller
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Thrust Bearings d1 d D1 D r r T da
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Thrust Bearings d1 d D1 D r r T da
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Thrust Roller Bearings r d1 d D D1
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Thrust Roller Bearings r d1 d T r D
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Thrust Roller Bearings r d1 d T r D
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Tapered Roller Thrust Bearings (Sin
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Tapered Roller Thrust Bearings (Sin
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Tapered Roller Thrust Bearings (Dou
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Self-Aligning Thrust Roller Bearing
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Bearings for special applications C
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Split Cylindrical Roller Bearings:
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Double-Fractured Split Cylindrical
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Bearings for Preparing Rolls: Sendz
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Enclosed-Type Tapered Roller Bearin
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Tapered Roller Thrust Bearings: Scr
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Tapered Roller Thrust Bearings: Scr
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Tension Leveler Roll Unit: Cartridg
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Turn Table Bearings: 3-Row Cylindri
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Sealed Spherical Roller Bearings: M
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Spherical Surface Slide Bearings ¡
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Catalog List & Appendix Table
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Catalog List CATALOG TITLES CATALOG
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Appendix Table D-5 Appendix table 1
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Appendix Table Appendix table 2: Co
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Appendix Table h4 h5 h6 h7 h8 h9 h1
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Appendix Table H7 H8 H9 H10 H11 H13
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Appendix Table Appendix table 8: Vi
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D-15 1/64 1/32 3/64 1/16 5/64 3/32
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NTN - Large Bearings

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