Friction clutch with electromechanical actuator, in particular for motor vehicle

Friction clutch, having on the one hand a clutch engagement device comprising engaging and disengaging means (3), bearing on a cover (2), the cover fixed to a flywheel (102) for driving in rotation, for action on a thrust plate (1) and clamping the friction linings (7) of a friction disc (6) between the trust plate (1) and the driving flywheel (102) and on the other hand a linkage (80) for acting in an opposing fashion on the internal end of the disengaging means (3), an actuator (50, 60, 70, 90, 91) for controlling said linkage in which the actuator has maneuvering means with an electric motor (50), a mechanical transmission (60) with an input element (51) formed by the output shaft of the electric motor (50), an output element (61, 161) for acting on the linkage (80), elastic assistance means (70) acting between a fixed part (91) and an element (61, 161) of the transmission in order to act in an opposing fashion with respect to the disengaging means so that the electric motor (50) provides only a small force for disengaging the clutch, the elastic assistance means (70, 370) bear on a fixed part (91, 66, 291) and on a part (61, 161) which is movable in translation and fixed in rotation forming a nut for cooperating with the output shaft (51) of the electric motor, forming a screw, movable in rotation and fixed in translation, in that the movable part (61) forms the output element of the mechanical transmission (60) whilst being able to act on the linkage (80), wherein the elastic assistance means consist of a mounting of Belleville washers (71 to 74) in series and in that force transmission means (75 to 77) act between the Belleville washers.