Needle Roller Bearings - Ntn-snr.com

More documents

Recommendations

Info

Sealing Devices NTN Table 9.4 Seals (NTN contact seals) Seal type Features Contact seals (G type, GD type) Seal using mainly direct contact This seal type is a special-purposed seal for needle roller bearings which was designed for smaller section height so as to correspond flexibly to the said bearings. This is a synthetic rubber contact seal reinforced with steel plate, being then used in the operating temperature range of -25 to +120˚C and, under continuous running condition, used at 100˚C and less. For application under special operating conditions of over 120˚C at operating temperature, etc., feel free to contact NTN for any inquiry. Application examples Fig. 9.13 Bearing sealing by NTN seals (Example) 9.7 Shaft surface roughness Sealing performance and seal life depend on the surface roughness, accuracy and hardness of shaft sliding surface with which the seal lip comes in contact. Table 9.7 shows the surface roughness as a guideline. For improving better the wear resistance of shaft surface it is desirable to secure the shaft surface hardness at least at HRC40 and over (at HRC55 and over if possible) by heat treatment and hard chrome plating. Table 9.7 Shaft surface hardness (Reference) Peripheral speed m/s over incl. 5 5 10 10 Surface roughness Ra 0.8a 0.4a 0.2a A-48
Bearing Handling NTN 10. Bearing Handling A rolling bearing is a precision part. It must be handled very carefully to keep its preciseness unchanged. Particularly the handling instructions given hereunder must be observed in handling. [1] Keeping bearing and other related parts clean Foreign matters such as mist, dust, etc. would cause harmful affect on bearing running and life. To avoid such harmful effect, bearing and other parts mounted adjacent to the bearing must be kept clean and, in addition, handling tools, lubricant, washing oil, work environment, etc. must always be maintained in clean condition respectively. [2] Careful handling Any shock to a bearing in handling would result in surface flaw and indent of its raceway surface and rolling elements and, in the worst case, result in cracking and chipping. To avoid such defects and trouble, bearings must be handled with good care. [3] Use of proper handling tools It should be avoided to use another inappropriate tool as an alternative of the specific tool in installing and removing. Specific tools suited to the individual bearing types must be used. The special-purposed handling tools must be used particularly when installing a drawn cup needle roller bearing. [4] Protection of bearing from rusting A rust preventive oil is coated on all of bearings, as a rule. However, direct handling of bearings by the bare hands would cause rusting of the bearings from adhesion of hand sweat thereto. To protect bearings from rusting, a pair of gloves must be put on or otherwise mineral oil be coated on the hands in the case of direct handling by the bare hands. 10.1 Bearing storage Bearings are all shipped after coated with rust inhibitor and packaged. It is desirable to store bearings at room temperature and relative humidity of 60% and less. The storage period of a grease-filled and sealed bearing is limited to the specific lifetime of non-greased bearing. 10.2 Installation Although depending on bearing type and fitting conditions, the bearing installing methods described hereunder are selectively available as the general method. However, refer to Commentary given in the Dimensions Table for installation of the drawn cup needle roller bearings. (1) Preparations prior to installing For installation of bearings it is desirable to prepare a cleaned and dried work place. Contaminant, burr, chips, etc. must be removed completely from all the parts related to a shaft and a housing before installing. Furthermore, the bearing mount must be inspected to verify whether its dimensional accuracy, profile accuracy and surface roughness are within the respective specified tolerance ranges. Bearings are all unpacked before installing. In the case of using bearings with grease lubrication, generally they may be installed as are without washing off the rust inhibitor coated thereon. Where a bearing is used with oil lubrication or the lubricating function of a grease-lubricated bearing is impaired by a mixture of grease and rust inhibitor, however, the bearing must be installed after complete removal of the rust inhibitor by clean washing oil. It is not allowed to wash shield type and seal type bearings and one-way clutch. (2) Press-fit by a press machine In general, the press-fit method using a press machine is widely used for installation of bearings. In detail, the bearing ring (inner ring or outer ring) is press-fitted slowly via a backing strip as illustrated in Fig. 10.1. It is not allowed to apply the press force to a bearing via its rolling elements like a bad example illustrated in Fig. 10.2 (page A-50). Further, a small size bearing with small interference may be installed by hammering the bearing ring with a plastic hammer or the like. In that case, however, the uniform hammering force must be applied to the bearing side face via the backing strip as illustrated in Fig. 10.1, because direct hammering to the bearing end face or partial hammering by use of a punch could impair the specific bearing performance. Fitting the inner ring on a shaft by hammering the outer ring or fitting the inner ring by hammering itself would result in surface flaw and indent of the raceway surface and the rolling elements. Therefore, doing so must be avoided absolutely. Also, friction of the fitting surface can be reduced by coating high viscosity oil on the surface. Stagger to be provided between the fitting jig and the inner ring. Fig. 10.1 Press-fitting of inner ring Air vent A-49
Page 1 and 2: For New Technology Network R corpor
Page 3 and 4: Technical Data A-001058 Needle roll
Page 5 and 6: Needle Roller Bearings
Page 7 and 8: DIMENSIONAL DATA CONTENTS Needle Ro
Page 9 and 10: Classification and Characteristics
Page 19 and 20: Load Rating and Life NTN Table 2.1
Page 21 and 22: Load Rating and Life NTN When the o
Page 23 and 24: Load Rating and Life NTN 2.10 Radia
Page 25 and 26: Calculation of Bearing Loads NTN (2
Page 27 and 28: Calculation of Bearing Loads NTN 3.
Page 29 and 30: Bearing Accuracy NTN 4. Bearing Acc
Page 31 and 32: A-27 Bearing Accuracy NTN 7 7 8 8 8
Page 33 and 34: Bearing Accuracy NTN Table 4.5 Allo
Page 35 and 36: Bearing Internal Clearance NTN 5.2.
Page 37 and 38: Bearing Fits NTN 6.4 Recommended Fi
Page 39 and 40: Bearing Fits NTN 6.5 Interference C
Page 41 and 42: Shaft Bearing and Fits Housing Desi
Page 43 and 44: Shaft Bearing and Fits Housing Desi
Page 45 and 46: Lubrication NTN Table 8.2 Grease va
Page 47 and 48: Lubrication NTN (4) Circulating lub
Page 49 and 50: Sealing Devices NTN 9. Sealing Devi
Page 51: Sealing Devices NTN 9.2 Combined se
Page 55 and 56: Bearing Handling NTN the bearing fi
Page 57 and 58: Technical Data NTN 11.2 Bearings wi
Page 59 and 60: Technical Data NTN expressed in the
Page 61 and 62: Bearing Type Symbols and Auxiliary
Page 63 and 64: Needle roller and cage assemblies B
Page 65 and 66: Needle Roller and Cage Assemblies
Page 67 and 68: Needle roller and cage assemblies N
Page 81 and 82: Cage and roller type needle roller
Page 83 and 84: Needle Roller and Cage Assemblies f
Page 85 and 86: Needle roller and cage assemblies f
Page 91 and 92: Drawn Cup Needle Roller Bearings
Page 93 and 94: Drawn cup needle roller bearings NT
Page 103 and 104:
Drawn cup needle roller bearings NT
Page 105 and 106:
Page 107 and 108:
Drawn cup needle roller bearings se
Page 109 and 110:
Drawn cup needle roller bearings se
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Machined Ring Needle Roller Bearing
Page 117 and 118:
Machined ring needle roller bearing
Page 119 and 120:
Page 121 and 122:
Machined-ring needle roller bearing
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Machined Ring Needle Roller Bearing
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
Inner Rings
Page 179 and 180:
Inner rings NTN Type IR d 510mm Bou
Page 181 and 182:
Inner rings NTN d 1520mm Boundary d
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Inner rings NTN d 80100mm Boundary
Page 189 and 190:
Inner rings NTN d 170380mm Boundary
Page 191 and 192:
Inner rings NTN Inch series Type MI
Page 193 and 194:
Inner rings NTN d 101.600203.200mm
Page 195 and 196:
Adjustable-Clearance Needle Roller
Page 197 and 198:
Clearance-adjustable needle roller
Page 199 and 200:
Clearance-adjustable needle roller
Page 201 and 202:
Complex Bearings
Page 203 and 204:
Complex bearings NTN Bearing compon
Page 205 and 206:
Complex bearings NTN B-143
Page 207 and 208:
Needle roller bearings with thrust
Page 209 and 210:
Page 211 and 212:
Page 213 and 214:
Page 215 and 216:
Needle roller bearings with angular
Page 217 and 218:
Needle roller bearings with three-p
Page 219 and 220:
Needle roller bearings with double-
Page 221 and 222:
Needle roller bearings with double-
Page 223 and 224:
Roller Followers / Cam Followers
Page 225 and 226:
Roller followers: Yoke-type track r
Page 227 and 228:
Page 229 and 230:
Roller followers : Yoke type truck
Page 231 and 232:
Page 233 and 234:
Page 235 and 236:
Page 237 and 238:
Cam followers stud type truck rolle
Page 239 and 240:
Page 241 and 242:
Page 243 and 244:
Page 245 and 246:
Page 247 and 248:
Page 249 and 250:
Page 251 and 252:
Page 253 and 254:
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
Thrust Roller Bearings
Page 269 and 270:
Thrust roller bearings NTN Bearing
Page 271 and 272:
Thrust roller bearings NTN B-209
Page 273 and 274:
Thrust needle roller bearings NTN B
Page 275 and 276:
Thrust needle roller bearings NTN B
Page 277 and 278:
Thrust cylindrical roller bearing N
Page 279 and 280:
Page 281 and 282:
Page 283 and 284:
COMPONENTS Needle Rollers/Snap Ring
Page 285 and 286:
Needle rollers NTN Application of n
Page 287 and 288:
Needle rollers NTN DW 4.55mm Bounda
Page 289 and 290:
Snap rings NTN For shaft Type WR Be
Page 291 and 292:
Snap rings NTN For housing Type BR
Page 293 and 294:
Snap rings NTN Bearing numbers Boun
Page 295 and 296:
Seals NTN Type G Type GD Type G Typ
Page 297 and 298:
LINEAR BALL BEARINGS: Solid, Drawn
Page 299 and 300:
Linear Ball Bearings NTN Components
Page 301 and 302:
Linear Ball Bearings NTN Components
Page 303 and 304:
Solid type linear ball bearings NTN
Page 305 and 306:
Machined cup linear ball bearings N
Page 307 and 308:
Linear ball bearings, stroke type N
Page 309 and 310:
Machined ring linear ball bearings
Page 311 and 312:
Linear flat rollers NTN Stopper Fig
Page 313 and 314:
Linear flat rollers NTN Type BF Typ
Page 315 and 316:
Linear roller bearings NTN Type RLM
Page 317 and 318:
One-way Clutches Tension Pulleys, B
Page 319 and 320:
One-way clutches NTN Shaft and hous
Page 321 and 322:
One-way clutch miniature type NTN T
Page 323 and 324:
Bottom roller bearings NTN Type FRI
Page 325 and 326:
Bottom roller bearings NTN Type FRI
Page 327 and 328:
Tensioner pulleys for textile machi
Page 329 and 330:
Contents of Appendix Approximate co
Page 331 and 332:
Appendix NTN ˚C-˚F temperature co
Page 333 and 334:
C-5 Appendix NTN Standard ball Hult
Page 335 and 336:
Appendix NTN Unit system Quantity P
Page 337 and 338:
Appendix NTN Viscosity conversion t
Page 339 and 340:
Appendix NTN Ordinary tolerance for
Page 341 and 342:
Page 343 and 344:
Page 345 and 346:
Appendix NTN High Low Hig
Page 347 and 348:
Appendix NTN H7 H8 H9 H10 H11 H13 J
show all

Needle Roller Bearings - Ntn-snr.com

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?