Abstract: A diaphragm clutch mechanism for a motor vehicle engine having a friction lining adapted to be clamped with an annular diaphragm between a reaction plate and a pressure plate. A cover fixed to the reaction plate and integral in rotation with the pressure plate which is also mobile in axial translation relative to the reaction plate, and an assist mechanism includes a Belleville washer which co-operates with the diaphragm so that the load exerted on the pressure plate should be substantially constant whatever the degree of wear of the friction lining when the clutch mechanism is in engaged position. The assist Belleville washer is supported on the diaphragm or on the cover that forms a front stop. The assist Belleville washer is supported on a rear stop borne by the cover so as to be slightly stressed when the clutch mechanism is in the released position.

Abstract: A pressure plate for a dry friction clutch has a central hole with a set of ventilating fins formed on its inner periphery.

Abstract: A clutch release bearing with a control member made of synthetic material and having a thin bearing plate (30) secured to the thrust surface (7) thereof opposite a fixed raceway (11) of a ball bearing (3), by means of tabs (32) which are provided at the outer periphery of the plate and are flexible enough to be able to bend and lockingly engage the control member.

Abstract: A clutch mechanism for a motor vehicle clutch comprises a cover plate and a diaphragm, which is mounted for pivoting deflection on the cover plate between a primary abutment carried by the cover plate and a secondary abutment formed on a crown ring. The crown ring is carried by assembly lugs which are joined to the cover plate, and which define a weakening groove of trapezoidal form. This weakening groove defines a bending line along which a terminal wing portion of the assembly lug is bent in an approximately radial direction. The weakening groove has two inclined side flanks. The inclined lateral flanks of each weakening groove are inclined with respect to the radial direction by different amounts, with the flank closer to the end portion of the assembly lug being inclined by a greater amount than the other flank which is closer to the cover plate.

Abstract: The clutch mechanism has a cover (2), a thrust plate (1), elastic member with axial action (3) for acting on the thrust plate (1), circumferential tongues (5) attached at their ends by fixing devices (6, 8) each respectively to an area (53) on the cover (2) and to a lug (11) on the thrust plate (1), and at least one device (8) for limiting the axial travel of the thrust plate (1), which for this purpose passes through an opening (93) formed in a stop zone (91) on a limitation area (54) of the cover and having a continuous shoulder (81), larger in size than the opening (93), suitable for coming to bear against the stop zone (91). This zone (91) is delimited on the inside by a slot (9) affecting the connecting area (23) and partly extends radially below the limitation area (54), as well as the limitation device (8).