| 摘要 |
There is provided a power transmission device that causes no vibration in a rotation direction and collision noise even if a shock absorbing rubber is permanently deformed in a compression direction. Specifically, even if compression forces repeatedly applied to a shock absorbing rubber 12 causes the shock absorbing rubber 12 to be permanently deformed in a compression direction, an elastic member 16 placed between the shock absorbing rubber 12 and each protrusion 11 a presses the shock absorbing rubber 12 circumferentially of a pulley 10 and a transmission ring 11 , and therefore, a shock of an abrupt rotation number change caused by rattling between the shock absorbing rubber 12 and the transmission ring 11 can be absorbed by the elastic member 16 , and vibration in a rotation direction and collision noise can be prevented.
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