192 clutches and power-stop control – Clutches – Axially engaging
Patent
1995-07-10
1998-03-31
Marmor, Charles A.
192 clutches and power-stop control
Clutches
Axially engaging
19211323, F16D 1372
Patent
active
057328080
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
a) Field of the Invention
This invention relates to clutch modules, especially for motor vehicles.
b) Description of Related Art
As is known, a clutch module includes, in a unitary manner, a mechanism, a clutch friction wheel and a flywheel, the mechanism itself comprising a cover plate by which it is secured on the flywheel, a diaphragm which bears on the cover plate, and a pressure plate on which the diaphragm bears.
Lying between the pressure plate and the flywheel, the space in which the friction liners of the friction disc that forms part of the clutch friction wheel are disposed is usually very confined, and the disadvantage can result that there is a risk of over-heating of one and/or the other of the components concerned.
SUMMARY OF THE INVENTION
An object of the invention is to provide a clutch module of this kind in which ventilation is improved in order to reduce this risk, and which also has other advantages.
The said clutch module is characterised in that, in the vicinity of its periphery having the larger diameter, the flywheel carries ventilating fins projecting axially on its front surface, that is to say its surface that faces towards the pressure plate, and in that the said ventilating fins extend radially beyond the friction disc of the clutch friction wheel, in line with the friction liners of the said friction disc.
The said ventilating fins are located in alignment with the friction liners of the friction disc of the clutch friction wheel, with the friction liners, and the friction surfaces with which they cooperate, having the benefit of being swept by an airstream which is set up, in use, between the ventilating fins and apertures which are also formed for this purpose in the flywheel, and which, by evacuating heat, is particularly favourable for the cooling of the assembly.
In addition, the pressure plate having radial lugs which are connected by tongues to the cover plate of the mechanism, so as to couple it in rotation to the latter, while allowing it to undergo axial displacement with respect thereto, at least one of the ventilating fins, having a height which may be smaller than that of the others, is at least partly located axially in line with a said lug.
This ventilating fin thus has the additional advantage that it limits the axial course of travel of the pressure plate with respect to the flywheel, by offering an axial engagement surface to the pressure plate, which, by consequently limiting the possible wear in the friction liners of the friction disc of the clutch friction wheel, has the advantage that it avoids any risk of deterioration of the pressure plate and/or of the flywheel by the rivets which are normally provided for fastening the said friction liners on to the plate that carries them.
BRIEF DESCRIPTION OF THE DRAWINGS
The features and advantages of the invention will appear more clearly from the description which follows, by way of example, with reference to the attached diagrammatic drawings, in which:
FIG. 1 is a view of a clutch module in accordance with the invention, in axial cross section taken on the broken line I--I in FIG. 2;
FIG. 2 is a plan view of the same, in the direction of the arrow II in FIG. 1, locally cut away so as essentially to leave only the pressure plate and the flywheel;
FIG. 3 is a partial view of the same, in axial cross section taken on the line III--III in FIG. 2;
FIG. 4, which is on a larger scale, is another partial view of the same, in axial cross section taken on the line IV--IV in FIG. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As is shown in the drawings, the clutch module 10 in accordance with the invention constitutes a unitary assembly and comprises, in axial succession and in a manner known per se, a mechanism 11, a clutch friction wheel 12, and a flywheel 13.
The mechanism 11 itself comprises, in axial succession, a cover plate 14 which is attached to the flywheel 13 as will be described later on herein, a diaphragm 15 which bears on the cover plate 14, and a pressure plate
REFERENCES:
patent: 2205629 (1940-06-01), Peterson
patent: 3499512 (1970-03-01), Maurice
patent: 3661238 (1972-05-01), Davies
patent: 4657128 (1987-04-01), Fujito et al.
patent: 4776443 (1988-10-01), Maruyamano et al.
patent: 4923043 (1990-05-01), Okuno
patent: 4947973 (1990-08-01), Takeuchi
patent: 4989709 (1991-02-01), Takeuchi
patent: 5072816 (1991-12-01), Takeuchi et al.
patent: 5172608 (1992-12-01), Schultz et al.
Sevennec Michelle
Viola Paolo
Marmor Charles A.
Rodriguez Sael J.
Valeo
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