| 摘要 |
Tensioner (1) for a transmission belt (2) comprising a fixed part (3) suitable for being rigidly connected to a support structure and provided with a pin (11) defining a first axis (A), a movable part (4) comprising a hub (13) rotating on the pin (11) about the first axis (A), a pulley (5) carried by the movable part (4) and rotating with respect thereto about a second axis (B) distinct from the first axis (A) and parallel thereto, and a spiral spring (6) interposed between the fixed part (3) and the movable part (4) and suitable for loading in use the movable part (4) in the direction tending to keep the pulley (5) in engagement with the relative belt (2); the spring has an internal end (24) secured to the pin (11), and an external end (25) secured to the hub (13), and is interposed between two bushes (20, 26) which support the hub (13) on the fixed part (4) and are provided with respective flanges (28, 29) cooperating axially with the said spring (6). <IMAGE> |
