| 摘要 |
<p>A belt tensioning device for an endless drive belt for a vehicle accessories drive system. A sheet metal bracket is adapted to be mounted on an engine adjacent the drive belt and has a lever plate pivotally mounted thereon. An idler pulley is rotatably mounted on the lever plate and is adapted to be moved in a belt tensioning direction for engagement with the drive belt. A coil spring is mounted on the bracket and is engaged with the lever plate biasing the lever plate and pulley in the belt tensioning direction. A series of ratchet teeth is provided in the lever plate and is engaged by a detent which is mounted on the bracket and formed of a strip of spring steel. The spring steel detent-ratchet teeth engagement retards movement of the lever plate in a direction opposite to belt tensioning direction. Also the detent will bow outwardly due to the resiliency thereof while retarding the reverse movement of the lever plate to provide n damping effect on the belt engaging pulley. Alternately a pad of friction material may be mounted on the end of the leaf spring detent and frictionally engage the lever plate to provide the damping effect replacing the series of ratchet teeth.</p> |
