| 摘要 |
PCT No. PCT/EP95/05141 Sec. 371 Date Oct. 17, 1996 Sec. 102(e) Date Oct. 17, 1996 PCT Filed Dec. 27, 1995 PCT Pub. No. WO96/21117 PCT Pub. Date Jul. 11, 1996An actuator, particularly for the operation of a vehicle clutch in which an annular piston (10) slides between cylinder walls (11, 12) to define an annular working chamber (20). A sealing means (15) seals the piston to the cylinder walls and an overflow chamber (26, 27) retains any fluid which leaks past the sealing means from the working chamber. A return means (28) is also provided for returning fluid from the overflow chamber when the piston is not undertaking a working stroke. |
