| 摘要 |
The invention comprises a tensioner having a pulley (1) journaled to a housi ng (3). The housing further comprises a guide (4). The guide slidingly engages rails (7, 17) on a base (6). The guide and rails constrain the housing to mo ve in a predetermined linear path. The rails are horizontally offset from two axis defined by the pulley. The pulley load is also vertically offset from t he axis of movements of the guide. The guide and rails have a predetermined frictional coefficient so that the cumulative result is an asymmetric dampin g effect. Further, a linkage (8) is connected between the housing and a cammin g body (9). The camming body is rotatably connected to the base. A biasing member such as a torsion spring (11) biases the camming boy against the belt load through the linkage. The radius of the camming body is variable to maintain a constant belt load as the tensioner pulley moves in response to a load change.
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