Abstract: A heat engine motor vehicle, having a reaction plate, a friction disc, a pressure plate, a cover, the pressure plate being two half-plates, axially mobile relative to each other, under the action of device compensating play resulting from wear which comprises a pair of complementary ramps circumferentially arranged axially associated respectively with each of the two half-plates one of the ramps being designed to move circumferentially relative to the other ramp in the direction increasing the thickness of the pressure plate, and prevented from moving in the other direction by a one-way mechanism, one of the ramps being arranged at the periphery of an inertial part. A monitoring mechanism, is provided to control the wear compensation device.

Abstract: The invention concerns a friction clutch, for a heat engine motor vehicle, comprising a reaction plate, a friction disc, a pressure plate, a cover, the pressure plate consisting of two half-plates, axially mobile relative to each other, under the action of device compensating play resulting from wear which comprises a pair of complementary ramps circumferentially arranged axially associated respectively with each of the two half-plates (12A, 12B), one of the ramps being designed to move circumferentially relative to the other ramp in the direction increasing the thickness of the pressure plate, and prevented from moving in the other direction by a one-way means (24), one of the ramps being arranged at the periphery of an inertial part (12A).

Abstract: A clutch release device comprises a clutch release bearing which slides axially along a tubular guide member fixed to a fixed structure and defining an axis, and a declutching fork pivoted on the fixed structure about pivot arrangement which define at least one pivot point spaced away from the axis. The fork acts on the clutch release bearing through a thrust zone of a manoeuvring element of the latter, so as to displace the release bearing axially along the guide member. The declutching fork acts on the thrust zone in a line of contact which intersects the axis regardless of the angular position of the declutching fork.

Abstract: A friction clutch for a motor vehicle comprises a cover plate and a pressure plate, with an elastic diaphragm between them. The diaphragm has an outer peripheral portion which is formed with two concentric annular ribs projecting axially and defining respective convexities which are oriented in opposite directions. Each of these convexities cooperates with a respective surface portion formed in facing relationship with the diaphragm on a corresponding one of the members comprising the pressure plate and the cover plate. The diaphragm having these ribs has a cross section, taken in an axial plane through the annular peripheral portion of the diaphragm, which is substantially in the form of a letter S or Z.