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 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.

Tapered roller bearings 32205 Specifications

Principle dimensions(d): 25mm
Principle dimensions(D): 52mm
Principle dimensions(B): 19.25mm
Basic load ratings(dyn.): 35.8KN
Basic load ratings(stat.): 44KN
Reference speed: 9500r/min
Limiting speed: 13000r/min
Weight: 0.19kg

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