192 clutches and power-stop control – Clutches – Axially engaging
Patent
1995-07-10
1997-11-04
Pitts, Andrea L.
192 clutches and power-stop control
Clutches
Axially engaging
192 7027, 192 8923, F16D 1104
Patent
active
056829701
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to clutch modules, especially for motor vehicles.
2. Description of the Prior Art
As is known, a clutch module comprises, as a unitary assembly, a mechanism, a clutch friction wheel and a flywheel, the mechanism itself comprising, among other components, a cover plate by which it is attached on to the flywheel.
Conventionally, fastening of the cover plate on the flywheel is carried out by screwing, riveting, or seaming.
This then makes it necessary, either to form screw threads and/or holes in the components to be assembled together, or, in the case of seaming, to make use of complex tooling.
In order to overcome these disadvantages, it is proposed in the document GB-A-2 193 271 to provide an arrangement in which mounting means of the bayonet fitting type are interposed between the cover plate and the flywheel.
These means make use of apertures formed in the outer periphery of the flywheel, and U-shaped lugs formed in the cover plate.
The lugs are engaged in the apertures, and rotation is then effected in such a way that the said lugs embrace the outer periphery of the flywheel.
It is accordingly necessary to form a groove in the region of the starter crown which is carried by the flywheel, so as to accommodate the ends of the lugs of the cover plate.
That arrangement complicates the manufacture of the flywheel, and increases the radial size of the module.
An object of the invention is to provide a clutch module which enables these drawbacks to be avoided.
SUMMARY OF THE INVENTION
According to the invention, a clutch module of the type described above, in which the mounting means comprise on the cover plate at least two sectors elongated circumferentially and spaced apart on a circle, is characterised in that each of the sectors has a transversely projecting engagement lip over at least a part of its length, in that the said mounting means comprise on the flywheel an equal number of bosses, each of which, being elongated in the circumferential direction and being spaced apart from each other by an angle subtended thereby at the centre and being at least equal to the angle subtended by a sector of the cover plate, has, over at least a part of its length measured from one of its circumferential ends, a transverse groove with which the engagement lip of a said sector is in engagement, and in that the engagement lip of a sector of the cover plate extends radially away from the axis of the assembly, and in combination therewith, the groove of a of the flywheel is formed on the surface of the latter facing towards the said axis.
In all cases, by virtue of such mounting means, the assembly together of the mechanism and the flywheel essentially involves only a simple axial engagement of the mechanism on the flywheel, followed by relative rotation of the mechanism through a fraction of a turn with respect to the flywheel, as in the prior art.
It will however be appreciated that the flywheel is of a simple form, with its bosses being formed easily by casting, and that the lips of the cover plate are easily made by press-forming.
It is therefore not necessary to provide a recess in the region of the starter crown of the flywheel, and the cover plate does not extend beyond the outer periphery of the flywheel, so that the radial size of the module is reduced.
In addition, the cover plate has a reduced axial size as compared with that in the document GB-A-2 193 271 mentioned above. The material requirement is thus reduced.
However, preferably, in order to prevent rotation of the mechanism on the flywheel, there is associated with at least one of the sectors of the cover plate a lug which, being bent accordingly, is in circumferential abutting engagement against the corresponding boss of the flywheel, and it is then convenient to carry out the bending of this lug after assembly.
In all cases, advantageously, no seaming or threading and/or drilling is necessary for this assembly, nor any riveting or welding.
The said assembly therefore has th
REFERENCES:
patent: 3499512 (1970-03-01), Maurice
patent: 4362230 (1982-12-01), Corral
patent: 4600092 (1986-07-01), Billet et al.
patent: 5143190 (1992-09-01), Westendorf et al.
Pitts Andrea L.
Valeo
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