| 摘要 |
An object of the present invention, in an idler pulley having a pulley main body formed of steel sheet, is to prevent the pulley main body and the outer ring of a bearing from creeping and the pulley main body from slipping off. An idler pulley according to the invention comprises a pulley main body adapted to have a belt entrained therearound, a ball bearing fitted in the pulley main body, and a shaft member fitted in the inner ring of the ball bearing, wherein a layer of a soft metal whose Young's modulus is lower than those of the pulley main body and the outer ring of the bearing is interposed between the inner surface of the pulley main body of steel sheet and the outer surface of the outer ring of the bearing. When a belt is entrained, this soft metal layer elastically deforms to thereby function to fill a clearance which develops between the pulley main body and the outer ring of the bearing, thereby minimizing the decrease of the joining force between the pulley main body and the outer ring of the bearing, thus preventing drawbacks, such as creep, from occurring.
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