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
33115 75 125 37 37 29 - 1.8
33116 80 130 37 37 29 - 1.9
33117 85 140 41 41 32 - 2.45
33118 90 150 45 45 35 - 3.1
33205 25 52 22 22 18 - 0.23
33206 30 62 25 25 19.5 - 0.37
33207 35 72 28 28 22 - 0.56
33208 40 80 32 32 25 - 0.77
33209 45 85 32 32 25 - 0.82
33210 50 90 32 32 24.5 - 0.9
33211 55 100 35 35 27 - 1.2
33212 60 110 38 38 29 - 1.54
33213 65 120 41 41 32 - 2.05
33214 70 125 41 41 32 - 2.1
33215 75 130 41 41 31 - 2.25
33216 80 140 46 46 35 - 2.9
33217 85 150 49 49 37 - 3.7
33218 90 160 55 55 42 - 4.49
02872/02820 29 73 22 22.22 17.46 - 0.48
02872/02820 1 3 1 0.875 0.688 - 0.48