| 摘要 |
A tensioner for a power transmission belt that is adapted to be operated in an endless path and a method of making the same are provided, the tensioner comprising a support unit for being fixed relative to the belt, a belt engaging unit carried by the support unit and being movable relative thereto, and a mechanical spring unit operatively associated with the support unit and the belt engaging unit for urging the belt engaging unit relative to the support unit and against the belt with a force to tension the belt. The spring unit has a longitudinal axis and is spiraled about the axis thereof. The support unit comprises a shaft unit having a longitudinal axis and is fixed from movement relative to the belt engaging unit, the belt engaging unit having a portion thereof rotatably carried by the shaft unit so as to rotate relative to the shaft unit. The support unit comprises a cup-shaped casing having an open end and receiving the spring unit therein. An antifriction disc-like member is disposed on the shaft unit between the portion of the belt engaging unit and the spring unit, the disc-like member substantially sealing closed the open end of the casing whereby the disc-like member performs a dual function.
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