| 摘要 |
A belt tensioner for a motor vehicle engine comprises a pivot shaft (28) and an eccentric pivoted structure (50) mounted for pivoted movement on the pivot shaft. The belt tensioner has a rotatable pulley membe r (90) mounted for rotation on the eccentric pivoted structure. A spring (64) is constructed and arranged to bias the eccentric pivoted structure in a direction tending to force the rotatable pulley member into tensioning engagement with a belt (16) trained about the pulley member. A mounting bolt (14) is constructed and arranged to mount the belt tensioner on the motor vehicle engine (12), said pivot shaft being movable relative to said mounting bolt and towards said belt during a belt tensioner installation procedure. The present invention also relates to a method of installing a belt tensioner in which the pivot shaft moves in a substantially exactly linear fashion as the tensioner is moved into tensioning engagement with the belt. In a preferred embodiment, when the belt tensioner is moved into tensioning engagement with the belt, an external force is applied to the tensioner to balance any belt load forces tending to tilt the tensioner during installation. The present invention also discloses a tensioner that has contact portions that oppose the tilting force applied by the beltduring installation, and a portion that extends beyond the contact portions to facilitate installation. |
