192 clutches and power-stop control – Elements – Lubricating – insulating – or cooling
Patent
1999-02-17
2000-12-12
Bonck, Rodney H.
192 clutches and power-stop control
Elements
Lubricating, insulating, or cooling
F16D 1372
Patent
active
061585629
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a clutch friction disc for a dry friction clutch, more particularly for a motor vehicle, and also to a friction crown of friction material for equipping such a friction disc.
A motor vehicle dry friction clutch includes, in general terms, a friction disc having two friction crowns, each of which is secured to a support which may be a common support, the support or supports being connected to a splined hub in engagement with a gearbox input shaft. A torsion damping device is, in general, interposed between the support or supports for the crowns and the splined hub. A progressive engagement device is generally disposed between the two crowns, being constituted by the support or supports which have particular arrangements for this purpose, or by an additional device.
The friction disc is, in use, placed between, on the one hand, a reaction plate which is connected directly or indirectly to the crankshaft of the engine of the vehicle, and on the other hand, a pressure plate of a clutch mechanism which includes a cover plate coupled to the reaction plate and an elastic system, which in practice is a spring or so-called diaphragm applying an axial biasing force to the pressure plate, which is coupled in rotation to the cover plate while being able to be displaced axially with respect to the latter by a limited amount.
In the clutch engaged position, the friction crowns of the friction disc are gripped under the effect of the elastic system between the reaction plate and the pressure plate, in such a way that the rotation torque from the heat engine is transmitted to the gearbox input shaft.
Declutching means, which in practice consist of fingers with which the diaphragm is provided, eliminate the effect of the elastic system when a force is applied to them, which, under the effect of return means of the pressure plate acting between the pressure plate and the cover plate, causes the pressure plate to be displaced away from the reaction plate, and therefore causes the friction crowns of the friction disc to be released from being gripped, so that the friction disc, which is mounted for axial movement on the gearbox input shaft, is displaced between the reaction plate and the pressure plate, and the effect of this is to interrupt the transmission of the torque from the engine.
In order that the interruption of the transmission of the torque shall be otal, the declutching operation must be complete, that is to say the friction crowns must no longer be in contact with the reaction plate and the pressure plate.
BRIEF SUMMARY OF THE INVENTION
The Applicant has discovered the existence of phenomena which disturb correct disengagement of the friction crowns.
In this connection, there frequently occurs an unequal disengagement of the friction crown from one of the adjacent plates (i.e. the reaction plate or pressure plate), or even retention against one of the plates, which causes a residual torque to be transmitted to the gearbox input shaft, a consequence of which is that it leads firstly to difficulty in changing gear, and secondly to the occurrence of premature wear in the components of the gearbox.
DETAILED DESCRIPTION OF THE INVENTION
An object of the present invention is to overcome these drawbacks.
A clutch friction disc for a dry friction clutch, more particularly for a motor vehicle, having two friction crowns, is, in accordance with the invention, characterised in that the said friction crowns include means for generating an air pressure force under the effect of the rotation of the friction disc, in that the said means for generating an air pressure force comprise grooves formed on the face of each of the friction crowns adapted to come into contact with a reaction plate and a pressure plate, respectively, of a clutch, and in that the said grooves comprise a circumferential groove in communication with a plurality of radial grooves which are open at the inner periphery of the friction crown.
Thus the disengagement of the friction crowns and t
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International Search Report dated Aug. 13, 1998.
Benoit Daniel
Federzoni Luc
Bonck Rodney H.
Valeo
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