192 clutches and power-stop control – Clutches – Axially engaging
Patent
1998-05-15
1999-08-17
Lorence, Richard M.
192 clutches and power-stop control
Clutches
Axially engaging
192111A, 74425, 74575, 74577SF, F16D 1375
Patent
active
059379863
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a friction clutch, in particular for a motor vehicle, and more particularly it relates to a clutch equipped with a wear compensating device for compensating for wear, in particular in the friction liners, the said device, referred to hereinafter as a wear compensating device, operating as the said liners become worn.
A conventional friction clutch generally includes a reaction plate, which may be in two parts so as to constitute a torsion damper, and which is mounted in rotation on a first shaft, which is typically a driving shaft such as the crankshaft of the internal combustion engine and which supports, through its outer periphery, a cover plate to which at least one pressure plate is attached.
The pressure plate is coupled in rotation to the cover plate and to the reaction plate, while being able to be displaced axially under the action of controlled axially acting resilient means, consisting generally of a metallic diaphragm which bears on the cover plate, while a friction disc, carrying friction liners at its outer periphery and fixed in rotation to a shaft, typically a driven shaft such as the input shaft of the gearbox, is interposed between the pressure plate and the reaction plate in such a way as to be gripped between them when the clutch is in an engaged condition. The diaphragm controls the axial displacement of the pressure plate when it is actuated by a clutch release bearing. More precisely, the clutch release bearing acts on the device for disengaging the clutch (the fingers of the diaphragm), which therefore counteracts the action of the means for disengaging the clutch (the peripheral part of the diaphragm, in the form of a Belleville ring) acting on the pressure plate.
In the course of the useful life of such a clutch, the friction liners become worn along with the counter materials, i.e. the pressure plate and reaction plate, and this causes variation to take place in the position of the pressure plate and those of the axially acting resilient means and the clutch release bearing, from which there follows a variation in the gripping force exerted between the friction disc on the one hand and the pressure and reaction plates on the other hand, because of the changes that take place in the working conditions (or positions) of the diaphragm, and the force necessary to disengage the clutch is consequently affected. By equipping such a clutch with a wear compensating device, these drawbacks are avoided, the diaphragm and the clutch release bearing, which is typically in constant engagement on the diaphragm, occupying generally the same position when the clutch is in its engaged condition.
There has previously been proposed, in the French patent application filed on Sep. 21, 1995 under the number 95 11090 and published under the number 2 739 159, a friction clutch, especially for a motor vehicle, of the kind comprising a reaction plate adapted to be mounted in rotation on a driving shaft, a friction disc carrying friction liners at its outer periphery and adapted to be mounted in rotation on a driven shaft, a pressure plate, a cover plate fixed on the reaction plate, axially acting resilient means acting between, firstly, the cover plate, and secondly, the pressure plate through abutment means, the pressure plate being fixed in rotation to the cover plate while being able to be displaced axially with respect thereto and being subjected to the action of resilient return means for returning the pressure plate axially towards the cover plate, the said clutch further including a wear compensating device comprising circumferentially disposed ramp means located axially between the abutment means and the pressure plate and adapted to be driven in rotation by means of a set of teeth, which they carry at their periphery and with which a worm cooperates, means for driving the worm in rotation being provided and being rendered operational by wear in the friction liners when the clutch is engaged, the means for driving the worm in rotation consisting of a ratchet wheel f
REFERENCES:
patent: 3222941 (1965-12-01), Winslow
patent: 5029687 (1991-07-01), Asada et al.
patent: 5090536 (1992-02-01), Asada
patent: 5251737 (1993-10-01), Flotow et al.
patent: 5816379 (1998-10-01), De Briel et al.
Lorence Richard M.
Valeo
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