| 摘要 |
An object of the present invention is to provide a power transmission device in which the cushioning effect due to a cushioning member can be maintained for a long period of time, and the process for assembling the cushioning member can be simplified. In the power transmission device in accordance with the present invention, A plurality of convex portions ( 30 a) are provided on the outer peripheral surface of a cushioning rubber ( 30 ) at intervals in the circumferential direction. A plurality of concave portions ( 10 b) are provided in the inner peripheral surface of a pulley ( 10 ) at intervals in the circumferential direction. The convex portions ( 30 a) are fitted in the concave portions ( 10 b). Therefore, the cushioning rubber ( 30 ) transmits turning force while being deformed elastically in the shear direction between the pulley ( 10 ) and an inner ring ( 20 ). Thereupon, the cushioning rubber ( 30 ) is not deformed elastically in the repeated compression direction, so that permanent deformation does not occur in the compression direction.
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