192 clutches and power-stop control – Clutches – Axially engaging
Patent
1999-09-23
2000-12-19
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Axially engaging
192111A, F16D 1375
Patent
active
061616702
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a friction clutch, in particular for a motor vehicle, and relates more particularly to a clutch equipped with a device compensating for wear due notably to the wear on the friction linings, the said device, hereinafter referred to as the wear take-up device, operating progressively as the said linings wear.
A conventional friction clutch generally has a reaction plate, possibly in two parts in order to form a damping flywheel, fixed with respect to rotation to a first shaft, usually a driving shaft such as the crankshaft of the internal combustion engine, and supporting, through its external periphery, a cover to which at least one thrust plate is attached.
The thrust plate is fixed with respect to rotation to the cover and reaction plate whilst being able to move axially under the action of controlled axially acting elastic means, generally a metal diaphragm bearing on the cover, whilst a friction disc, carrying friction linings at its external periphery, fixed with respect to rotation to a shaft, usually a driven shaft such as the input shaft of the gearbox, is interposed between the thrust plate and the reaction plate so as to be clamped between them when the clutch is in the engagement position. The diaphragm controls the axial movement of the thrust plate when it is actuated by a clutch release bearing.
During the service life of such a clutch, the friction linings and the counter-materials, the thrust plate and the reaction plate, wear, which causes a variation in the position of the thrust plate and the positions of the axially acting elastic means and of the clutch release bearing, resulting in a variation in the clamping force between the friction disc on the one hand and the thrust and reaction plates on the other hand, because of the changes in the working conditions of the diaphragm, and the force necessary to declutch is affected thereby. By providing such a clutch with a wear take-up device, these drawbacks are avoided, the diaphragm, and the clutch release bearing, usually in constant abutment against the diaphragm, occupying the same position when the clutch is in the engagement position.
A friction clutch has been proposed, notably in French patent application FR-A-2 753 503 filed on Sep. 17, 1996 under the number 96-11297, in particular for a motor vehicle, of the type having a reaction plate intended to be fixed with respect to rotation to a driving shaft, a friction disc carrying friction linings at its external periphery, intended to be fixed with respect to rotation to a driven shaft, a thrust plate, a cover fixed to the reaction plate, axially acting elastic means acting between on the one hand the cover and on the hand the thrust plate by means of abutment means, the thrust plate being fixed with respect to rotation to the cover whilst being able to move axially with respect to it and being subjected to the action of elastic return means returning the thrust plate axially towards the cover, the said clutch also having a wear take-up device comprising circumferentially disposed ramp means, placed axially between the abutment means and the thrust plate, the said ramps being adapted to cooperate with counter-ramp means, the said wear take-up device also comprising teeth with which a tangentially disposed worm cooperates, one of the two members, the ramp means and the counter-ramp means, being fixed to the said teeth, means for rotatably driving the worm being provided, made operational by the wear on the friction linings when the clutch is engaged, the worm and the means of rotatably driving the worm being carried by a support.
According to the said French application, a clutch of the above type comprises ramp means adapt to be driven in rotation by virtue of the teeth which they carry at their periphery, whilst the worm and the means of driving the worm in rotation are carried by the support, here fixed to the cover.
Such an arrangement functions well; however, it requires a well adapted cover; moreover, the axially acting elastic means consist of a diap
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International Search Report for PCT/FR98/01277.
Doremus Olivier
Travers Jean-Luc
Bonck Rodney H.
Rodriguez Saul
Valeo
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