Hydraulic actuated release unit i.e. concentric slave cylinder, for operating e.g. dry friction clutch in gear box of motor car to achieve over or reduction ratios, has friction increasing device increasing friction between spring and ring

摘要

The unit (1) has a friction increasing device in contact with a preload spring (10) on an abutment surface for increasing friction between the preload spring and a preload spring attachment ring (11). The friction increasing device is designed as a ramp that exhibits inclination that is aligned against another inclination that occurs in the preload spring. A surface area of the ramp faces the preload spring, and is molded in a linear or concave curved manner. The ramp is aligned transverse to a circumferential direction of the attachment ring.