| 摘要 |
An object is to exert the intended fretting-preventive effect without being influenced by the size of variation in rotation (variation in speed) or the size of vibration.An arrangement comprising a main shaft gear 1 having a raceway surface 1c on its inner peripheral surface, a bearing inner ring 2 having a raceway surface 2a on the outer periphery, tapered rollers 3 disposed between the raceway surface 1c of the main shaft gear 1 and the raceway surface 2a of the bearing inner ring 2 and held at predetermined circumferential intervals by a cage 4, an imbalance means which produces a circumferential weight imbalance in the assembly of the tapered rollers 3 and cage 4, wherein the roughness of the cone back face 2b of the bearing inner ring 2 is 0.01-0.04 mumRa, and the roughness of the large end faces 3b of the tapered rollers 3 is 0.01-0.05 mumRa, and the radius of the large end faces 3b are worked such that the maximum value thereof including the working precision is substantially equal to the reference radius. Further, full crowning is applied to the rolling contact surfaces 3a of the tapered rollers 3 and the surfaces of the tapered rollers 3 are formed with coating films of the MoS2 type.
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