NTN - Large Bearings

Double Row Tapered Roller Bearings (Outside Direction)
Sb
Db
r1a
ra
da
Equivalent bearing load
dynamic
PrXFrYFa
Fa
Fr
e
Fa
e Fr
X Y X Y
1 Y1 0.67 Y2
static
PorFrYoFa
For values of e, Y2 and Yo
see the table below.
Abutment and fillet dimensions Load Constant Axial load factors Mass
center
mm mm kg
d a D b S b r as r las
min min min max max a e Y 1 Y 2 Y o (approx.)
238 368 18 3 1.5 178.5 0.49 1.38 2.06 1.40 77.5
242 378 15 4 2 148 0.40 1.68 2.50 1.64 73.1
248 359 30 3 2 154.5 0.40 1.68 2.50 1.64 67
248 355 20 3 2 164 0.33 2.03 3.02 1.98 84.4
266 367 26 6 1.5 181 0.44 1.54 2.29 1.50 88.5
257 312.5 15 4 1.5 129.5 0.41 1.66 2.47 1.62 27.3
252 314 10 2 1 139.5 0.46 1.47 2.19 1.44 21.6
258 339 5 3 1.5 117 0.37 1.80 2.69 1.76 30.2
258 339 11.5 3 1.5 131 0.37 1.80 2.69 1.76 36.5
254 356 17 2.5 1 145 0.32 2.12 3.15 2.07 53
254 347 14 2.5 1 161 0.37 1.80 2.69 1.76 53.8
262 375 7 4 1.5 144 0.40 1.68 2.50 1.64 58.9
262 373 16 4 1.5 164 0.40 1.68 2.50 1.64 71.7
258 376 20.5 3 1.5 167.5 0.32 2.12 3.15 2.07 96
258 406 19 3 1.5 189 0.49 1.38 2.06 1.35 100.4
258 421.5 27 3 1.5 226 0.43 1.57 2.34 1.53 164.8
264 357 5.5 2.5 1.5 123.5 0.37 1.80 2.69 1.80 35.3
282 372 6 4 1.5 131 0.37 1.80 2.69 1.76 41.5
282 374 13 4 1.5 143 0.37 1.80 2.69 1.76 53
278 376 19.5 3 1.5 154.5 0.29 2.32 3.45 2.26 79
282 412 8 4 1.5 161 0.40 1.68 2.50 1.64 82.2
278 416.5 13.5 3 1.5 175 0.40 1.68 2.50 1.64 99.0
282 413 18 4 1.5 176 0.40 1.68 2.50 1.64 101
302 383 15 4 1.5 161 0.39 1.70 2.59 1.70 53.8
302 394 6 4 1.5 136 0.37 1.80 2.69 1.76 47.2
302 397 13.5 4 1.5 148 0.37 1.80 2.69 1.76 57.3
308 435 8 5 2 168 0.40 1.68 2.50 1.64 87.4
308 433 18.5 5 2 177 0.40 1.68 2.50 1.64 109
308 386 15 3 1.5 154 0.42 1.62 2.42 1.59 40
308 407 7.5 3 1.5 162 0.39 1.74 2.59 1.70 72.7
322 428 6.5 4 1.5 151 0.37 1.80 2.69 1.76 65.6
B-133