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 110 200 41 38 32 - 5.1
30302 15 42 14 13 11 - 0.09
30303 17 47 15 14 12 - 0.13
30304 20 52 16 15 13 - 0.17
30305 25 62 18 17 15 - 0.26
30306 30 72 21 19 16 - 0.39
30307 35 80 23 21 18 - 0.52
30308 40 90 25 23 20 - 0.72
30309 45 100 27 25 22 - 0.97
30310 50 110 29 27 23 - 1.25
30311 55 120 32 29 25 - 1.55
30312 60 130 34 31 26 - 1.95
30313 65 140 36 33 28 - 2.4
30314 70 150 38 35 30 - 2.9
30315 75 160 40 37 31 - 3.45
30316 80 170 43 39 33 - 4.05
30317 85 180 45 41 34 - 4.6
31309 45 100 27 25 18 - 0.95
31312L 60 135 34 31 22 - 2.3
32004 20 42 15 15 12 - 0.09