Patent ID: 8807314

Claim:
A pressure medium-controlled clutch actuator, comprising: a housing; an actuating piston arrangeable to move in an axial direction in the housing; an elastic diaphragm having a rim, the elastic diaphragm supporting one end of the actuating piston in the axial direction, the elastic diaphragm sealing-off a first area of the housing from a second area of the-housing, wherein the elastic diaphragm includes a raised area that extends in a direction away from the actuating piston distant from the rim; the raised area is formed by a region of the elastic diaphragm with increased thickness, as compared to a rest of the elastic diaphragm; said raised area rests in an assigned depression of the housing in one operating position of the clutch actuator such that the raised area completely fills the assigned depression; and said raised area in conjunction with said assigned depression of the housing achieve a biasing of the actuating piston in the axial direction when the clutch actuator is in said one operating position.