| 摘要 |
An auto tensioner includes a support shaft whose one end is fixed to a target-attaching object and which has an arm support portion, an arm whose one end is rotatably supported by the arm support portion and which has a pulley support portion projecting forwardly and axially beyond the top end of the support shaft, a tension pulley which is rotatably supported by the pulley support portion of the arm and arranged at a position offset from the support shaft, and a friction plate arranged between one end of the arm and the arm support portion of the support shaft and adapted to apply a rotary resistance to the arm. The friction plate is further provided with a load bearing member in the zone where a load resulting from the offset arrangement of the tension pulley is applied, so that the zone of the friction plate has a sufficient degree of load-resistance.
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