Friction clutch with controlled play compensation for motor vehicle

A friction clutch for a motor vehicle having a thermal engine, the friction clutch comprising a reaction plate (13) intended to be rotationally fixed to a driving shaft, a friction disc (14) carrying friction linings (15) at its external periphery and intended to be rotationally fixed to a driven shaft, a pressure plate (12, 112, 212, 312, 412, 712, 912), a cover (11, 911) fixed to the reaction plate (13), axially acting resilient means (16) acting between the cover (11, 911) and the pressure plate (12, 112, 212, 312, 412, 712, 812, 912), the pressure plate (12, 112, 212, 312, 412, 712, 812, 912) being rotationally fixed to the cover (11, 911) whilst being able to move axially with respect to it, one of the reaction plate (13), the pressure plate (12, 112, 212, 312, 412, 712, 812, 912) and the cover (11, 911) including two half-pieces able to be moved axially with respect to each other under the action of a device for taking up the play due to the wear, the play take-up device comprises at least one pair of circumferentially disposed complementary ramps (17, 117, 217, 317, 417;

• 18, 118, 218, 418) associated respectively with each of the two half-pieces (12A, 112A, 212A, 612A, 712A, 512A, 812A, 912A, 412A, 1012A;
• 12B, 112B, 212B, 312B, 412B, 712B, 812B, 912B, 1012B), one of the ramps (17, 117, 217, 317, 417) being adapted to move circumferentially with respect to the other ramp (18, 118, 218, 418) in a take-up direction to increase in the overall thickness of the one of the reaction plate (13), the pressure plate (12, 112, 212, 312, 412, 712, 812, 912) and the cover (11, 911) and prevented from moving in the opposite direction by a unidirectional means (24, 133, 240, 251, 350, 352, 440, 840, 1026), the circumferential movement being controlled by a release (22, 222, 322, 422, 922, 1022, 462) sensitive to the state of wear of the friction clutch, one of the ramps (18, 118, 218, 418) being provided at the periphery of an inertia piece (12A, 112A, 212A, 612A, 712A, 512A, 812A, 912A, 412A, 1012A) so that the complementary ramps make their relative circumferential movement in the direction of taking up of the play due to a non-cyclic nature of operation of the thermal engine, wherein the friction clutch comprises control means controlled by the axially acting resilient means (16) and provided to selectively control the operation of the play take-up device.