NTN - Large Bearings

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Thrust Bearings 1. Classification and Features 1. 1 Thrust ball bearings Balls are arranged between a set of washers (a shaft washer and housing washer) and the contact angle is 90. Axial loads can be supported in only one direction and radial loads cannot be supported. These bearings are unsuitable for high speed operation. Table 1 shows the standard cage models. 1. 2 Cylindrical roller thrust bearings These bearings use cylindrical rollers and have single row, double row, 3 row, 4 row, and also duplex types. Bearings can support only axial loads and are suitable to heavy loads. Their axial rigidity is high. Cages are the machined type. Table 1 Standard cage model Bearing series 511 512 513 514 Press cage Machined cage 51120 51152 51156 511/750 51220 51224 51226 51292 51320 51322 51340 51420 Model 811 Model 812 Model RT Model 893 Model 2RT Fig.1 Single type thrust ball bearing (Example of the press cage) Model 874 Model 3RT Fig.2 Cylindrical roller thrust bearing B-227
Thrust Bearings 1. 3 Tapered roller thrust bearings These are thrust bearings using tapered rollers, and the single type bearings have three types of housing washers. One type is the housing raceway with a rib, the other one is without a rib, and the third bearing is the full complement roller type. Double type bearings are mainly used to support axial loads on the roll neck of rolling mill. Machined cages are used for cages. Drawing 1 1. 4 Self-aligning thrust roller bearings These bearings have a self-aligning nature using barrelshaped rollers. The allowable aligning angle varies depending on the bearing's dimension system, but it is 1- 2for normal loads. Cages are machined type and the guide sleeve is on the axial housing raceway. Since the load capacity for axial loads is high, these bearings can support a certain amount of radial load in the instances that axial loads are applied. However, it is necessary to use these bearing where the load conditions meet Fr/Fa 0.55. These bearings have some spots where lubricant cannot enter such as the gap between the cage and guide sleeve. It is necessary to use oil lubrication even in low speed operation. Drawing 2 Fig.5 Self-aligning thrust roller bearing 2. Dimensional Accuracy / Rotation Accuracy Drawing 3 Fig.3 Tapered roller thrust bearings (Single type) Thrust ball bearings ⋯⋯⋯⋯⋯⋯Table 3.6 (Page A-18) Cylindrical roller thrust bearings ⋯⋯Table 3.6 (Page A-18) Tapered roller thrust bearings⋯⋯Table 3.8 (Page A-19) Self-aligning thrust roller bearings ⋯⋯Table 3.8 (Page A-19) 3. Recommended Fitting Thrust ball bearings Cylindrical roller thrust bearings Tapered roller thrust bearings Self-aligning thrust roller bearings Table 4.3 (Page A-26) 4. General Operating Cautions Fig.4 Tapered roller thrust bearings (Double type) Thrust bearings need to load a certain amount of axial load to prevent sliping between the rolling elements and axial housing raceway. Please consult with NTN Engineering for details. B-228
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For New Technology Network R corpor
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Warranty NTN warrants, to the origi
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A-2
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A-4
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Load Rating and Life n min -1 60,00
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Bearing Load Calculation 2. Bearing
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A-10A-30
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Bearing Tolerances Table 3.3 Tolera
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Bearing Tolerances 3.2 Limits and t
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Bearing Fits 4. Bearing Fits 4.1 In
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Bearing Fits (3) Consideration must
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Bearing Fits Table 4.3 Standard fit
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Bearing Fits Table 4.6 Fits for inc
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Bearing Internal Clearance (1) Redu
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Bearing Internal Clearance Table 5.
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Lubrication 6. Lubrication 6.1 Lubr
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Lubrication 6.3.2 Base oil Natural
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Lubrication 6.5 Oil lubrication Oil
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Lubrication Table 6.9 Factor K Expe
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MEMO A-46
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INDEX OF BEARING TABLES Deep Groove
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Deep Groove Ball Bearings
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Deep Groove Ball Bearings D r B r d
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Deep Groove Ball Bearings r D B r d
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Angular Contact Ball Bearings
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Angular Contact Ball Bearings 1. 2
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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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Page 225 and 226: Double Row Steep Slope Tapered Roll
Page 227 and 228: Double Row Steep Slope Tapered Roll
Page 229 and 230: Four Row Tapered Roller Bearings C2
Page 249 and 250: Sealed Four Row Tapered Roller Bear
Page 251 and 252: Spherical Roller bearings
Page 253 and 254: Spherical Roller Bearings 2. Dimens
Page 255 and 256: Spherical Roller Bearings B r r D d
Page 275: Thrust bearings
Page 279 and 280: Thrust Bearings d1 d D1 D r r T da
Page 281 and 282: Thrust Bearings d1 d D1 D r r T da
Page 283 and 284: Thrust Roller Bearings r d1 d D D1
Page 285 and 286: Thrust Roller Bearings r d1 d T r D
Page 287 and 288: Thrust Roller Bearings r d1 d T r D
Page 289 and 290: Tapered Roller Thrust Bearings (Sin
Page 291 and 292: Tapered Roller Thrust Bearings (Sin
Page 293 and 294: Tapered Roller Thrust Bearings (Dou
Page 295 and 296: Self-Aligning Thrust Roller Bearing
Page 301 and 302: Bearings for special applications C
Page 303 and 304: Split Cylindrical Roller Bearings:
Page 305 and 306: Double-Fractured Split Cylindrical
Page 307 and 308: Bearings for Preparing Rolls: Sendz
Page 309 and 310: Enclosed-Type Tapered Roller Bearin
Page 311 and 312: Tapered Roller Thrust Bearings: Scr
Page 313 and 314: Tapered Roller Thrust Bearings: Scr
Page 315 and 316: Tension Leveler Roll Unit: Cartridg
Page 317 and 318: Turn Table Bearings: 3-Row Cylindri
Page 319 and 320: Sealed Spherical Roller Bearings: M
Page 321 and 322: Spherical Surface Slide Bearings ¡
Page 323 and 324: Catalog List & Appendix Table
Page 325 and 326: 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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