| 摘要 |
A tensioner for a power transmission belt is provided that is adapted to be operated in an endless path, the tensioner comprising a support for being fixed relative to the belt, a belt engaging member carried by the support and being movable relative thereto. The tensioner has a mechanical spring operatively associated with the support and the belt engaging member for urging the belt engaging member relative to the support and against the belt with a force to tension the belt. The tensioner has a frictional dampening device operatively associated with the support and the belt engaging member to dampen the movement of the belt engaging member relative to the support in at least one direction of movement thereof, the dampening device having a longitudinal axis, the support comprising a shaft having a longitudinal axis and being fixed from movement relative to the belt engaging member. The belt engaging member has a portion thereof being rotatably carried by the shaft so as to rotate relative to the shaft, the dampening device has a pair of frictionally engaging first and second surfaces. The mechanical spring provides the force for urging the belt engaging member relative to the support and against the belt to tension the belt and further provides a certain force for urging the first surface against the second surface to dampen the movement of the belt engaging member.
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