192 clutches and power-stop control – Elements – Clutch element resiliently carried on hub
Patent
1996-02-09
1998-08-04
Bonck, Rodney H.
192 clutches and power-stop control
Elements
Clutch element resiliently carried on hub
74574, 403269, 4034061, 464 62, F16D 1358, F16D 100
Patent
active
057880433
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to reaction plates of mouldable material for a friction clutch, especially for motor vehicles.
2. Description of the Prior Art
As is known, such a reaction plate, also known as an engine flywheel, affords a friction surface for engagement with a friction disc furnished with friction liners, which may optionally be of divided form, and which are arranged to be gripped between the said reaction plate and the pressure plate of the clutch.
The pressure plate is subject to the action of axially acting resilient means such as a diaphragm or coil springs, which bear on a cover plate adapted to be fixed on the reaction plate, the latter being optionally of two-part form.
Such a reaction plate, which is typically in the form of a casting, can be seen for example in the document FR-A-2 463 874 (U.S. Pat. No. 4,362,230).
In that document, the cover plate has at its outer periphery a radial flange which is provided with fastening surface portions whereby it is secured to the reaction plate.
This fastening is obtained by means of screws, so that it is necessary to machine the surface of the reaction plate that faces towards the fastening surface portions of the cover plate, and to form threads in the latter for the fastening screws.
In a modified version, the cover plate can be secured on the reaction plate by seaming, as is described in the document FR-A-2 526 105 (U.S. Pat. No. 4,600,092).
In that case, it is again necessary to machine the reaction plate in order that the cover plate can be secured.
In addition, these reaction plates are specific to the cover plate with which they are associated.
An object of the present invention is to mitigate these drawbacks in a simple and inexpensive way, and accordingly to reduce the machining operations on the reaction plate, while having the option of fastening the cover plate in various different ways.
SUMMARY OF THE INVENTION
According to the invention, a reaction plate of the type described above is characterised in that it includes a fastening insert anchored in the mass of the said reaction plate, being buried within the latter, and in that the said insert has, projecting in the vicinity of the outer periphery of the reaction plate, a fastening zone for the fastening of the cover plate of the friction clutch.
Thanks to the invention, machining operations on the reaction plate are considerably reduced, with the friction surface offered by the reaction plate to the friction disc being machined as in the prior art.
By contrast, the machining operations for fastening of the cover plate are eliminated, due to the presence of the fastening insert. No relative movement is able to occur between the insert and the reaction plate, due to the fact that the insert is buried in the reaction plate.
The said insert preferably stiffens the reaction plate because it is embedded in the latter.
Thus the material of the reaction plate can be a less sophisticated metal, leading to a reduction in cost.
Because of the insert, it is possible to reduce the thickness of the reaction plate, so giving a reduction in the overall axial size of the clutch, with the insert preferably then extending transversely in the reaction plate.
Where the reaction plate has an axially oriented skirt at its outer periphery, it is possible to reduce the height of this skirt, and therefore to obtain the advantage of an increase in the diameter of the friction surface of the friction disc.
In general terms, because of the inserts, the reaction plate is able to rotate at increased rotational velocities, and/or to transmit greater torques, this plate having enhanced resistance to the effects of centrifugal force.
This plate also has enhanced resistance to thermal effects, since its tendency to assume a conical form is reduced due to the presence of the insert embedded within the reaction plate.
This leads to a reduction in wear of the liners of the friction disc, and possibly to a simplification of the latter.
The reaction plate has
REFERENCES:
patent: 1728619 (1929-09-01), Lambert
patent: 3499512 (1970-03-01), Maurice
patent: 4069905 (1978-01-01), De Gennes
patent: 4362230 (1982-12-01), Corral
patent: 4600092 (1986-07-01), Billet
patent: 5160007 (1992-11-01), Reik et al.
patent: 5368327 (1994-11-01), Shiraki et al.
Bertin Patrice
Feigler Jacques
Mokdad Ayman
Bonck Rodney H.
Valeo
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