Hydraulically operated device for tightening belt or chain, comprising corrugated outer cover for avoidance of leaking

摘要

The device is assembled of a lower part (2) with an integrated cylinder, an upper part (4) accommodating an axially movable piston (5) and a helical spring (6) surrounding the upper part (4). The lower part (2) also comprises the container for the hydraulic fluid (29). The unit is covered by a corrugated pipe section (22) made of metal and facilitating an appropriate motion. The cover (11b) is provided with an upper (24) and a lower cuff (23) connected to rigid rings (25, 26) in order to avoid leaking.