192 clutches and power-stop control – Clutches – Axially engaging
Patent
1997-02-19
1998-09-08
Lorence, Richard M.
192 clutches and power-stop control
Clutches
Axially engaging
192111A, F16D 1375
Patent
active
058032231
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a friction clutch, especially for a motor vehicle, and more particularly it relates to a clutch which is equipped with a device for taking up clearance due to wear in the friction liners, the said device operating continuously as wear takes place in the said liners.
A conventional friction clutch generally includes a reaction plate, which may be in two parts so as to constitute a damped flywheel, and which is mounted on a first shaft for rotation with the first shaft, which is typically a driving shaft such as the crankshaft of the internal combustion engine, the reaction plate supporting by its outer periphery a cover plate to which at least one pressure plate is attached.
The pressure plate is fixed to the cover plate and reaction plate for rotation with them, while being able to be displaced axially under the action of controlled, axially acting resilient means which generally consist of a metallic diaphragm that bears on the cover plate, while a friction disc, which carries friction liners at its outer periphery, and which is fixed to a shaft for rotation therewith, this shaft typically being 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 its engaged position. The diaphragm controls the axial displacement of the pressure plate when it is actuated by a clutch release bearing.
During the working life of such a clutch, the friction liners, and also, though to a lesser extent, the reaction elements consisting of the pressure plate and reaction plate, become worn, which gives rise to variation in the gripping force between the friction disc on the one hand and the pressure and reaction plates on the other hand, by virtue of the modifications to the working conditions of the diaphragm. The clutch travel also varies, as does the force necessary for declutching. By giving such a clutch a device for taking up the clearance which is due to wear in the liners, these drawbacks are avoided.
It is known from the document U.S. Pat. No. 4,207,972 to provide a device for taking up clearance in which a first plate, in this case the pressure plate, is in two coaxial parts, one of which is displaceable axially with respect to the other, in such a way that the overall thickness of the first plate is increased to the extent that the thickness of the friction liners is reduced.
In that document, the two coaxial parts of the first plate are dispaceable axially, one with respect to the other, by means of a device for taking up clearance due principally to wear in the friction liners, and this device comprises ramp means carried in a complementary manner by the two coaxial parts, which are in addition displaceable in rotation with respect to each other. The coaxial parts are put into relative rotary movement under the control of a triggering device responsive to the state of wear in the friction liners.
Such a device enables the clearance due to wear in the friction liners to be effectively taken up continuously. However, under severe working conditions, the pressure plate becomes heated, as do the remainder of the components of the clutch, so that a singular point is passed through, with clearance being taken up, and with the pressure plate adopting a conical form.
In order to overcome this disadvantage, it has been proposed in French patent application FR-A-2 722 852, filed on 21 Jul. 1994 under the number 94 09274, to provide a friction clutch, especially for a motor vehicle, of the kind comprising: the latter; to be mounted on a driven shaft for rotation with the latter; acting between the cover plate and the pressure plate, the pressure plate being rotatable with the cover plate while being displaceable axially with respect thereto; and pressure plate, consisting of two half plates, namely an outer half plate and an inner half plate, the inner half plate being the one which faces towards a friction liner and which is adapted to cooperate with the latter;
REFERENCES:
patent: 5409091 (1995-04-01), Reik et al.
patent: 5568852 (1996-10-01), Tomiyama
patent: 5595275 (1997-01-01), Gochenour et al.
patent: 5690203 (1997-11-01), Link et al.
Blard Michel
De Briel Jacques Thirion
Lorence Richard M.
Valeo
LandOfFree
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