192 clutches and power-stop control – Clutches – Axially engaging
Patent
1995-07-10
1998-02-10
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Axially engaging
192 8923, F16D 1358, F16D 1371
Patent
active
057159190
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a diaphragm clutch mechanism, especially for a motor vehicle.
More particularly, the invention is concerned with a clutch mechanism of the type comprising a first member having a generally annular form, known as a cover plate, which is adapted to be applied on the reaction plate of the clutch, a second member of generally annular shape referred to as a diaphragm, which bears on the cover plate and which comprises a peripheral portion defining a Belleville ring together with a central portion which is divided into radial fingers by slots for cooperation with a clutch release bearing, assembly means extending through the diaphragm via widened apertures defined by the slots of the diaphragm in the vicinity of the inner periphery of the Belleville ring of the diaphragm, with the said assembly means carrying a secondary abutment in facing relationship to a primary abutment which is carried by the cover plate, whereby to apply the diaphragm pivotally to the cover plate, and at least one plate, referred to as a pressure plate, which is fixed with respect to the cover plate for rotation with the latter while being mounted for axial movement with respect to it, and on which the peripheral portion of the diaphragm bears via an annular projecting engagement element which is divided into annular engagement sectors and which is formed at the outer periphery of the pressure plate for this purpose.
Such a mechanism is described in the document EP-A-0 535 702, and in the Application FR 2 692 637 filed on 19 Jun. 1992. In the document EP-A-0 535 702, the assembly means comprise retaining lugs, which are relatively thin and flat, being integral with the cover plate, and which extend axially through the diaphragm and have a locating bend at their free end.
These assembly means also carry at least one secondary abutment member in the form of a ring crown which provides a secondary abutment for the diaphragm, the said ring crown being interposed axially between the diaphragm and a support crown which is engaged on the retaining lugs, and which is located in one axial direction on the locating bend formed on the retaining lugs at their free end.
In the document FR 2 692 637, the assembly means comprise rivets which pass axially through the said apertures of the diaphragm, and which also carry a secondary abutment member in the form of a ring crown which is interposed axially between the diaphragm and a support crown fixed to the rivets.
The cover plate of the mechanism does of course offer a primary abutment in facing relationship with the secondary abutment, in such a way that the diaphragm is mounted pivotally between its primary and secondary abutments, located radially inwardly of the projecting engagement element of the pressure plate.
An object of the present invention is to make further use of the components carried by the assembly means.
In accordance with the invention, a clutch mechanism of the type described above is characterised in that one of the elements consisting of the secondary abutment member and the support crown is coupled in rotation to the said assembly means by mating cooperation therewith, and is extended at its outer periphery, by drive tongues which extend away from its plane and are fixed with respect to the said element, and which extend through the projecting engagement element of the pressure plate via slots separating the said engagement sectors, and in that the said tongues are adapted to be secured at their outer end to the pressure plate, in such a way that they couple the pressure plate to the cover plate, for rotation with it but with axial mobility thereon.
In one embodiment, the assembly means carry only one secondary abutment member, so that it is the latter that includes the drive tongues according to the invention.
Thanks to the invention, the support crown or the secondary abutment member provides a rotary coupling, with axial mobility, for the pressure plate with respect to the cover plate. By means of these drive tongues, it gives the pressure plate
REFERENCES:
patent: 3450241 (1969-06-01), Kuno
patent: 5236070 (1993-08-01), Simoncic et al.
Sevennec Michelle
Viola Paolo
Bonck Rodney H.
Valeo
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