| 摘要 |
<p>Device for transmitting the motive power from a driving gear (30) to a rotating shaft (21), comprising a clutch (10) with disks (13) acting upon actuation of spring means (14) and an annular piston (41) for disengaging the said clutch, acting upon operation of associated means (45,42a) for controlling supplying/discharging of the chamber (42) of the piston (41), in which said piston (41) has a radial duct (41a) formed in an axial position situated between the sealing elements (43) of the said piston and able to connect the chamber (42) of the piston (41) to the interspace (43a) formed between the said piston and the said sealing elements (43), there also being envisaged at least one venting duct (44) which connects said interspace (43a) with the exterior. <IMAGE></p> |
