| 摘要 |
<p>A pulley 2 has a hub 3 fixed to a rotating shaft (1), an outer wheel 4 which is disposed on the outer periphery of the hub 3 and around which a belt 10 is suspended, and a unidirectional clutch which is interposed between the hub 3 and the outer wheel 4, and a cam face for forming a wedged space of the unidirectional clutch 5 is formed at the inside of the pulley, whereby the unidirectional clutch 5 is switched between a free state and a lock state through the rotational variation of the hub which rotates integrally with the rotating shaft (1) to reduce the transmission of the rotational variation from the hub 3 to the outer wheel 4. Further, the unidirectional clutch 5 can operate stably without suffering the effect of the rotational centrifugal force. <IMAGE></p> |
