| 摘要 |
A Y-tensioner is provided for tensioning the endless drive of an engine having a starter-generator unit (SGU). First and second arms of the Y-tensioner are pivotable about a common first axis. The second arm is articulated to the first arm and spring-loaded to pivot about a second axis spaced from the first axis. The first arm tensions a first strand of the endless drive which becomes the tight side when the SGU operates as a starter and the second arm tensions the second strand which becomes the tight side when the SGU operates as a generator. Pivoting of the Y-tensioner about the first axis enables the first or second arm to better align with the dominant force on the pulleys as the SGU shifts between starter and generator modes, reducing torque about the second axis to reduce the size of the spring that tensions the two arms together. |
