| 摘要 |
A belt tensioner (10) mounted on mounting structure (12, 14) in normal (figu re 2) and reverse (figure 3, 4) modes which comprises a hub structure (16). An arm structure (18) is pivotally mounted on the hub structure (16) for pivota l movements with respect thereto about a pivot axis central to the hub structu re (16) between first and second limiting positions. A belt-engaging pulley (20 ) is rotatably mounted on the arm structure (18) for rotational movement about a rotational axis parallel with the pivotal axis. A spring system (22) is provided for resiliently biasing the arm structure (18) away from the first limiting position and toward the second limiting position. The hub structure (16) includes a normal mode mounting plate (30) on one axial end thereof (24 ) which engages the mounting structure (12, 14) when the mounting bolt (28) is secured therein as aforesaid. The hub structure (16) also includes a reverse mode mounting plate (38) at an opposite axial end
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