Ball and Roller Bearings - Ntn-snr.com

More documents

Recommendations

Info

Bearing Handling Fig. 15.24 shows two methods of disassembling bearings with adapters or withdrawal sleeves using a hydraulic nut. Fig. 15.25 shows a disassembly method using a hydraulic withdrawal sleeve where high pressure oil is injected between fitted surfaces and a nut is then employed to extract the sleeve. a) Disassembly of adapter sleeve b) Disassembly of withdrawal sleeve fig. 15.24 Disassembly using hydraulic nut Fig. 15.25 Extraction using hydraulic withdrawal sleeve A-92
Bearing Damage and Corrective Measures 16. Bearing Damage and Corrective Measures While it is of course impossible to directly observe bearings in operation, one can get a good idea of how they are operating by monitoring noise, vibration, temperature and lubricant condition. Types of damage typically encountered are presented in Table 16.1. Table 16.1 Bearing damage and corrective measures Description Causes Correction Flaking The surface of the race way wearing away. Conspicuous hills and valleys form soon afterward. ¡Excessive loads or improper handling. ¡Improper mounting. ¡Improper precision in the shaft or housing. ¡Insufficient clearance. ¡Contamination. ¡Rust. ¡Drop in hardness due to abnormally high temperatures. ¡Review application conditions. ¡Select a different type of bearing. ¡Reevaluate the clearance. ¡Improve the precision of the shaft and housing. ¡Reevaluate the layout (design) of the area around the bearing. ¡Review assembly procedures. ¡Review lubricant type and lubrication methods. Seizure The bearing heats up and becomes discolored. Eventually the bearing will seize up. ¡Insufficient clearance (including clearances made smaller by local deformation). ¡Insufficient lubrication or improper lubricant. ¡Excessive loads (excessive pressure). ¡Skewed rollers. ¡Check for proper clearance. (Increase clearances.) ¡Riview lubricant type and quantity. ¡Review application conditions. ¡Take steps to prevent misalignment. ¡Reevaluate the design of the area around the bearing (including fitting of the bearing). ¡Improve assembly procedures. Cracking and notching Localized flaking occurs. Little cracks or notches appear. ¡Excessive shock loads. ¡Excessive interference. ¡Large flaking. ¡Friction cracking. ¡Inadequate abutment or chamfer. ¡Improper handling. (gouges from large foreign objects.) ¡Review application conditions. ¡Select proper interference and review materials. ¡Improve assembly procedures and take more care in handling. ¡Take measures to prevent friction cracking. (Review lubricant type.) ¡Reevaluate the design of the area around the bearing. Retainer damage Rivets break or become loose resulting in retainer damage. ¡Excessive moment loading. ¡High speed or excessive speed fluctuations. ¡Inadequate lubrication. ¡Impact with foreign objects. ¡Excessive vibration. ¡Improper mounting. (Mounted misaligned) ¡Abnormal temperature rise. (Plastic retainers) ¡Review of application conditions. ¡Reevaluation of lubrication conditions. ¡Review of retainer type selection. ¡Take more care in handling. ¡Investigate shaft and housing rigidity. Meandering wear patterns Abrasion or an irregular, meandering wear pattern left by rolling elements along raceway surfaces. ¡Shaft or housing of insufficient accuracy. ¡Improper installation - Insufficient shaft or housing rigidity. ¡Shaft whirling caused by excessive internal bearing clearances. ¡Reinspect bearing’s internal clearances. ¡Review accuracy of shaft and housing finish. ¡Review rigidity of shaft and housing. Smearing and scuffing The surface becomes rough and some small deposits form. Scuffing generally refers to roughness on the race collar and the ends of the rollers. ¡Inadequate lubrication. ¡Entrapped foreign particles. ¡Roller skewing due to a misaligned bearing. ¡Bare spots in the collar oil film due to large axial loading. ¡Surface roughness. ¡Excessive slippage of the rolling elements. ¡Reevaluation of the lubricant type and lubrication method. ¡Review of operating conditions. ¡Setting of a suitable pre-load. ¡Improve sealing performance. ¡Take care to handle the bearing properly. Rust and corrosion The surface becomes either partially or fully rusted, and occasionally rust even occurs along the rolling element pitch lines. ¡Poor storage conditions. ¡Poor packaging. ¡Insufficient rust inhibitor. ¡Penetration by water, acid, etc. ¡Handling with bare hands. ¡Take measures to prevent rusting while in storage. ¡Improve sealing performance. ¡Periodically inspect the lubricating oil. ¡Take care when handling the bearing. A-93
Page 1 and 2:
For New Technology Network R corpor
Page 3 and 4:
Warranty NTN warrants, to the origi
Page 5 and 6:
TECHNICAL DATA CONTENTS 1. Classifi
Page 7 and 8:
Classification and Characteristics
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Bearing Selection Select bearing’
Page 15 and 16:
Bearing Selection 2.3 Selection of
Page 17 and 18:
Load Rating and Life 3. Load Rating
Page 19 and 20:
Load Rating and Life where, Lna : A
Page 21 and 22:
Bearing Load Calculation 4. Bearing
Page 23 and 24:
Bearing Load Calculation 4.1.2 Chai
Page 25 and 26:
Bearing Load Calculation 4.4 Equiva
Page 27 and 28:
Bearing Load Calculation 4.5 Allowa
Page 29 and 30:
Bearing Load Calculation Fr2 70 K
Page 31 and 32:
Boundary Dimensions and Bearing Num
Page 33:
Boundary Dimensions and Bearing Num
Page 36 and 37:
Bearing Tolerances Table 6.3 Tolera
Page 38 and 39:
Page 40 and 41:
Page 42 and 43:
Page 44 and 45: Bearing Tolerances Table 6.7 Tolera
Page 46 and 47: Bearing Tolerances 6.2 Chamfer meas
Page 48 and 49: Bearing Tolerances 6.3 Bearing tole
Page 50 and 51: Bearing Fits 7.3.2 Recommended Fits
Page 52 and 53: Bearing Fits Table 7.2 (3) Housing
Page 54 and 55: Bearing Fits Table 7.5 Numeric valu
Page 56 and 57: Bearing Fits Table 7.6 Fits for inc
Page 58 and 59: Bearing Internal Clearance and Prel
Page 70 and 71: Allowable Speed 9. Allowable Speed
Page 72 and 73: Lubrication 11. Lubrication 11.1 Lu
Page 74 and 75: Lubrication (1) Base oil Natural mi
Page 76 and 77: Lubrication 11.4 Solid grease (For
Page 78 and 79: Lubrication Bearing operating Lubri
Page 80 and 81: External bearing sealing devices 12
Page 82 and 83: External bearing sealing devices Ty
Page 84 and 85: Bearing Materials 13.2 Cage materia
Page 86 and 87: Shaft and Housing Design 14.2 Beari
Page 88 and 89: Bearing Handling 15. Bearing Handli
Page 90 and 91: Bearing Handling a) Installation on
Page 92 and 93: Bearing Handling 15.4 Post installa
Page 96 and 97: Bearing Damage and Corrective Measu
Page 98 and 99: Technical Data Axial displacement m
Page 100 and 101: Technical Data 17.4 Fitting surface
Page 102 and 103: A-100
Page 104 and 105: INDEX OF BEARING TABLES Deep Groove
Page 107 and 108: Deep Groove Ball Bearings Open type
Page 109 and 110: Deep Groove Ball Bearings bearing i
Page 111 and 112: Deep Groove Ball Bearings D D1 rN r
Page 123 and 124: Deep Groove Ball Bearings Equivalen
Page 129: Expansion Compensating Bearings Da
Page 132 and 133: Miniature and Extra Small Bearings
Page 134 and 135: Miniature and Extra Small Ball Bear
Page 143 and 144: Angular Contact Ball Bearings Angul
Page 145 and 146:
Angular Contact Ball Bearings 2. St
Page 147 and 148:
Single and Duplex Arrangements Db r
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
High Speed Single and Duplex Arrang
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Ultra-High Speed Angular Contact Ba
Page 169 and 170:
B-67
Page 171 and 172:
Ceramic Ball Angular Contact Ball B
Page 173 and 174:
Four-Point Contact Ball Bearings QJ
Page 175 and 176:
Double Row Angular Contact Ball Bea
Page 177:
Double Row Angular Contact Ball Bea
Page 180 and 181:
Self-Aligning Ball Bearings B r ra
Page 182 and 183:
Page 184 and 185:
Page 186 and 187:
Adapters (for self-aligning ball be
Page 188 and 189:
Adapters (for self-aligning ball be
Page 191 and 192:
Cylindrical Roller Bearings Cylindr
Page 193 and 194:
Cylindrical Roller Bearings 2. Stan
Page 195 and 196:
Cylindrical Roller Bearings ra r1a
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
Page 205 and 206:
Page 207 and 208:
Page 209 and 210:
Page 211 and 212:
Page 213 and 214:
L Type Loose Rib B2 B2 r1 r1 B1 d d
Page 215 and 216:
L Type Loose Rib B2 B2 r1 r1 B1 d d
Page 217 and 218:
Multi-Row Cylindrical Roller Bearin
Page 219 and 220:
Page 221 and 222:
Page 223 and 224:
Four-Row Cylindrical Roller Bearing
Page 225 and 226:
Page 227 and 228:
Page 229 and 230:
Page 231:
Page 234 and 235:
Tapered Roller Bearings Table 1 (co
Page 236 and 237:
Tapered Roller Bearings Inch Tapere
Page 238 and 239:
Tapered Roller Bearings Inch Tapere
Page 240 and 241:
Tapered Roller Bearings Metric syst
Page 242 and 243:
Page 244 and 245:
Page 246 and 247:
Page 248 and 249:
Page 250 and 251:
Page 252 and 253:
Page 254 and 255:
Page 256 and 257:
Page 258 and 259:
Tapered Roller Bearings Inch system
Page 260 and 261:
Page 262 and 263:
Page 264 and 265:
Page 266 and 267:
Page 268 and 269:
Page 270 and 271:
Page 272 and 273:
Page 274 and 275:
Page 276 and 277:
Page 278 and 279:
Page 280 and 281:
Page 282 and 283:
Page 284 and 285:
Page 286 and 287:
Page 288 and 289:
Page 290 and 291:
Page 292 and 293:
Page 294 and 295:
Page 296 and 297:
Multi-Row Tapered Roller Bearings O
Page 298 and 299:
Page 300 and 301:
Page 302 and 303:
Page 304 and 305:
Page 306 and 307:
Page 308 and 309:
Page 310 and 311:
Multi-Row Tapered Roller Bearings I
Page 312 and 313:
Multi-Row Tapered Roller Bearings I
Page 314 and 315:
Four Row Tapered Roller Bearings C2
Page 316 and 317:
Page 318 and 319:
Page 320 and 321:
Page 322 and 323:
Page 324 and 325:
Page 326 and 327:
Page 328 and 329:
Page 331 and 332:
Spherical Roller Bearings 1. Types,
Page 333 and 334:
Spherical Roller Bearings 5. Adapte
Page 335 and 336:
Spherical Roller Bearings ra Da ra
Page 337 and 338:
Page 339 and 340:
Page 341 and 342:
Page 343 and 344:
Page 345 and 346:
Page 347 and 348:
Page 349 and 350:
Page 351 and 352:
Page 353 and 354:
Page 355 and 356:
Adapter (For spherical roller beari
Page 357 and 358:
Adapter (For spherical roller beari
Page 359 and 360:
Withdrawal Sleeves (For spherical r
Page 361 and 362:
Page 363 and 364:
Page 365 and 366:
Page 367 and 368:
Double Row Angular Contact Thrust B
Page 369 and 370:
Double Row Angular Contact Thrust B
Page 371 and 372:
High Speed Duplex Angular Contact T
Page 373 and 374:
High Speed Duplex Angular Contact T
Page 375 and 376:
Self-Aligning Roller Thrust Bearing
Page 377 and 378:
Page 379 and 380:
Page 381 and 382:
Locknuts, Lockwashers & Lockplates
Page 383 and 384:
Locknuts Reference withdrawal sleev
Page 385 and 386:
Locknuts Reference bore no. 3 locko
Page 387 and 388:
Nuts Reference withdrawal sleeve no
Page 390 and 391:
Lockwashers Series AW ƒ r2 B2 ƒ1
Page 392 and 393:
Lockwashers Series AWL ƒ r2 B2 ƒ
Page 394 and 395:
Catalog List & Appendix Table
Page 396 and 397:
Catalog List CATALOG TITLES CATALOG
Page 398:
Appendix Table SI-customary unit co
show all

Ball and Roller Bearings - Ntn-snr.com

Create successful ePaper yourself

Delete template?

Save as template?