Taper Roller Bearing
Product Specification

The inner and outer ring raceways are segments of cones and the rollers are also made with a taper so that the conical surfaces of the raceways and the roller axes if projected, would all meet at a common point on the main axis of the bearing.>

This conical geometry is used as it gives a larger contact patch, which permits greater loads to be carried than with spherical (ball) bearings, while the geometry means that the tangential speeds of the surfaces of each of the rollers are the same as their raceways along the whole length of the contact patch and no differential scrubbing occurs. When a roller slides rather than rolls, it can generate wear at the roller-to-race interface, i.e. the differences in surface speeds creates a scrubbing action. Wear will degenerate the close tolerances normally held in the bearing and can lead to other problems. Much closer to pure rolling can be achieved in a tapered roller bearing and this avoids rapid wear.

The rollers are guided by a flange on the inner ring. This stops the rollers from sliding out at high speed due to their momentum.

The larger the half angles of these cones the larger the axial force that the bearing can sustain.

Tapered roller bearings are separable and have the following components: outer ring, inner ring, and roller assembly (containing the rollers and a cage). The non-separable inner ring and roller assembly is called the cone, and the outer ring is called the cup. Internal clearance is established during mounting by the axial position of the cone relative to the cup.

Bearing No. d D T B C R Mass
30222 110.000 200.000 41.000 38.000 32.000 - 5.100
30302 15.000 42.000 14.250 13.000 11.000 - 0.095
30303 17.000 47.000 15.250 14.000 12.000 - 0.130
30304 20.000 52.000 16.250 15.000 13.000 - 0.170
30305 25.000 62.000 18.250 17.000 15.000 - 0.260
30306 30.000 72.000 20.750 19.000 16.000 - 0.390
30307 35.000 80.000 22.750 21.000 18.000 - 0.520
30308 40.000 90.000 25.250 23.000 20.000 - 0.720
30309 45.000 100.000 27.250 25.000 22.000 - 0.970
30310 50.000 110.000 29.250 27.000 23.000 - 1.250
30311 55.000 120.000 31.500 29.000 25.000 - 1.550
30312 60.000 130.000 33.500 31.000 26.000 - 1.950
30313 65.000 140.000 36.000 33.000 28.000 - 2.400
30314 70.000 150.000 38.000 35.000 30.000 - 2.900
30315 75.000 160.000 40.000 37.000 31.000 - 3.450
30316 80.000 170.000 42.500 39.000 33.000 - 4.050
30317 85.000 180.000 44.500 41.000 34.000 - 4.600
31309 45.000 100.000 27.250 25.000 18.000 - 0.951
31312L 60.000 135.000 33.500 31.000 22.000 - 2.300
32004 20.000 42.000 15.000 15.000 12.000 - 0.097