192 clutches and power-stop control – Clutches – Operators
Patent
1995-11-30
1997-07-15
Lorence, Richard M.
192 clutches and power-stop control
Clutches
Operators
192109R, F16D 1371
Patent
active
056474687
DESCRIPTION:
BRIEF SUMMARY
This application is entitled to the benefits of international application, PCT/FR95/00389, filed Mar. 29, 1995 as prescribed by 35 U.S.C. 365.
The present invention concerns diaphragm clutch mechanisms and return hooks as described for example in the document FR-A-2 031 964.
Such a mechanism forms a unit assembly and includes a cover suitable for being attached to the reaction plate of the clutch, a diaphragm mounted on the cover by pivoting means pivotally fixing the diaphragm to the cover, a pressure plate fixed to the cover with respect to rotation whilst being mounted so as to be axially movable with respect to the latter by means of tangential elastic tongues, return hooks for coupling the diaphragm to the pressure plate by gripping the outer periphery of the diaphragm between the said hooks and a support boss, which the pressure plate has for supporting the diaphragm, fixing components serving to fix the tangential tongues and return hooks with lugs, which the pressure plate has radially projecting at its outer periphery.
Usually assembly is effected by fixing the tangential tongues to a radial flange on the cover by means of first fixing components such as rivets or screws, and then by mounting the hook on the tongues and finally slipping second fixing components into holes, which the tongues, hooks and lugs of the pressure plate have for this purpose.
As a result the cover, which has a base, has mounting holes affecting the said base in order to mount the hooks transversely and axially slip in the fixing components.
These holes are delimited by a rear edge adjacent to the base of the cover, a front edge furthest away axially from the base of the cover and two lateral edges connecting together the rear and front edges. The rear edge therefore affects the base of the cover.
In practice the diaphragm bears on the cover in order to act on the pressure plate so as to push the latter away from the cover.
When the mechanism is in the storage position, not yet mounted on the reaction plate, the tongues are highly stressed, so that their elastic limit may be exceeded and they may be damaged.
This is all the more true since the mechanism may be inadvertently dropped during faulty handling, the pressure plate then moving because of its inertia.
On the other hand, once mounted on the reaction plate, the tongues are less curved.
To mitigate this drawback arrangements may be devised which have recourse to at least one lug on the pressure plate coming to bear against one of the edges of an opening provided in the cover.
This arrangement requires the pressure plate to be modified. As a variant the tongues can be extended so that they come to bear against a counter-stop provided on the cover.
This requires modification of the tongues.
As a variant the fixing component can be extended so that it comes to bear against a stop formed on the cover.
This requires modification to the fixing component.
In general terms it is desirable, for economic reasons, not to destandardise the pressure plate, tongues and fixing components, all mass produced.
The object of the present invention is to meet this requirement and to mitigate these drawbacks simply and economically, whilst modifying the clutch mechanism as little as possible.
According to the invention a mechanism of the type indicated above is characterised in that at least some of the return hooks are extended outwards in order to form a stop suitable for coming to bear against an associated counter-stop formed by the front edge or lateral edge concerned of the mounting holes.
In this way a maximum number of components of the mechanism are retained, only the return hook being modified, and this in a simple and economical manner.
In addition use is made of the mounting holes and it is possible to fit or not to fit such a stop hook.
In addition, even if in the storage position the diaphragm is in abutment against the base of the cover, the tongues are protected by preventing any movement of the pressure plate, for example during falls.
The following description illustrates
REFERENCES:
patent: 2770341 (1956-11-01), Wobrock
patent: 3939951 (1976-02-01), Sink et al.
patent: 4122929 (1978-10-01), Maucher et al.
patent: 4690259 (1987-09-01), Naudin
Giroire Jean-Pierre
Villata Gino
Lorence Richard M.
Valeo
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