US 2003/0141163 A1Published application

Friction clutch with controlled play compensation for motor vehicle

AssigneeValeo

InventorsOlivier Doremus, Gilles Payraudeau, Herve Maurel, Jean-Louis Delevallee, Ciriaco Bonfilio, Mathieu Leclercq

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Abstract

The invention concerns a friction clutch for a heat engine motor vehicle, comprising a reaction plate (13), a friction disc (14), a pressure plate (12), a cover (11), the pressure plate (12) consisting of two half-plates (12A, 12B) integral in rotation with the input shaft but axially mobile, relative to each other, under the action of a device compensating play due to wear which comprises a pair of complementary ramps (17, 18) circumferentially arranged, axially associated respectively with each of the half-plates (12A, 12B), one of the ramps (17) called support ramp being integral in rotation to one (12B) of the half-plates, the other ramp (18) called adjustment ramp, being adapted to move circumferentially relative to the support ramp (17) in the direction increasing the global thickness of the first plate (12), called compensating direction, and prevented from moving in the other direction by one way means (24), said circumferential movement being controlled by a tripping element (22) sensitive to wear condition, the adjusting ramp (18) being arranged at the periphery of an inertia piece (12A), so that the cyclic variations in the heat engine of the motor vehicle are used to cause the matching ramps to move relatively along the circumference in the wear compensating direction: control means (30) are adapted to monitor the wear compensating device by enabling it to operate or preventing it from doing so.

Friction clutch, for a motor vehicle with a thermal engine, of the type 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, 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 pieces, the reaction plate (13) or the pressure plate (12, 112, 212, 312, 412, 712, 812, 912) or cover (11, 911), consisting of 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, which 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 the direction of increase in the overall thickness of the said piece, referred to as the take-up direction, and prevented from moving in the other direction by a so-called unidirectional means (24, 133, 240, 251, 350, 352, 440, 840, 1026), the said circumferential movement being controlled by a release (22, 222, 322, 422, 922, 1022, 462) sensitive to the state of wear, 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 lack of periodicity of the thermal engine of the motor vehicle is taken advantage of in order to make the complementary ramps make their relative circumferential movement in the direction of taking up of the play, characterised by the fact that it comprises control means adapted to control the play take-up device by allowing its operation or not.

Abstract

Claims28