Abstract: A clutch actuator (1) for actuating a vehicle clutch includes a cylinder (3) filled with pressure medium. An annular piston (4) is axially displaceably arranged in the cylinder. The annular piston (4) is fixedly operatively connected to a sliding sleeve (5) slidably mounted on a guide sleeve (6). A radially inner casing surface (16) of the annular piston (4) has an inner radius (Ri) and is arranged radially next to the guide sleeve (6). A sliding ring (18; 19) supports the sliding sleeve (5) on the guide sleeve (6). The sliding ring (18; 19; 18a) is inserted into a groove (27; 28) in the radially inner casing surface (16). In order to be able to mount undivided sliding rings, the groove (27; 28) has a single radially extending groove wall (29; 32) and is open toward an axially outer or inner end face (30; 33) of the annular piston (4).

Abstract: A clutch actuator (1) for actuating a vehicle clutch includes a cylinder (3) filled with pressure medium. An annular piston (4) is axially displaceably arranged in the cylinder. The annular piston (4) is fixedly operatively connected to a sliding sleeve (5) slidably mounted on a guide sleeve (6). A radially inner casing surface (16) of the annular piston (4) has an inner radius (Ri) and is arranged radially next to the guide sleeve (6). A slip ring (18; 19) supports the sliding sleeve (5) on the guide sleeve (6). The slip ring (18; 19; 18a) is inserted into a groove (27; 28) in the radially inner casing surface (16). In order to be able to mount undivided slip rings, the groove (27; 28) has a single radially extending groove wall (29; 32) and is open toward an axially outer or inner end face (30; 33) of the annular piston (4).