192 clutches and power-stop control – Elements – Engaging surfaces
Patent
1999-02-23
2000-08-15
Lorence, Richard M.
192 clutches and power-stop control
Elements
Engaging surfaces
192 526, F16D 1364
Patent
active
061021849
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a disc with friction linings for a mechanical clutch, the disc having in a peripheral region surrounding a central part fixing zones generally parallel to the plane of said central part, on the one hand for a first lining that is annular or divided into segments and adapted to come into friction contact with the pressure plate of the clutch and on the other hand for a second lining that is also annular or divided into segments and adapted to come into friction contact with the reaction plate of the clutch.
Said peripheral region of the disc can be annular and continuous but is routinely divided into radial blades carrying the aforementioned fixing zones, the blades being joined to the central part of the disc by a root and serving alternately for fixing the first lining and for fixing the second lining. The blades can be in one piece with the central part of the disc or riveted to it. The blades for fixing one lining can be a different shape than the blades for fixing the other lining and the shapes can vary within very wide limits depending on the required effect or on manufacturing imperatives.
The blades can also all have the same shape, for example a flag shape, and be positioned alternately to offer fixing zones serving alternately for fixing one of the linings and for fixing the other lining.
DESCRIPTION OF THE RELATED ART
Examples of blades of these various types are given in European Patent Application 0 579 554 (U.S. Pat. No. 5,452,783) and in French Patent Application 2 370 893. To make the fixing of the linings more rigid and to achieve more regular wear of the linings, without indentations, it is customary to provide additional bearing zones on each blade, for example on respective opposite sides of its fixing zone for the lining concerned, offset towards the other lining and serving as a support for it. This is the case in the aforementioned two documents. This being the case, the function of a friction disc of the above kind for a mechanical clutch, the widest field of application of which is naturally to motor vehicles, is sufficiently well known to the technician in this art not to require description. For more information reference may be had to the aforementioned documents. Suffice to say that when the clutch is engaged the drive torque is transmitted from a driven shaft via the friction disc, the friction linings of which are clamped between the pressure plate and the reaction plate of the clutch.
The present invention is more particularly concerned with fixing the linings to the blades of the discs.
The problem has two aspects: above, causes a tendency for the blades to flex in their central part when they loaded between the pressure and reaction plates or for glueing. Consequently, the support offered by the blades to the lining tends to be concentrated on the bends, whether the blades and linings are glued or riveted together, with the risk of imprints on the linings; blade surface to which the adhesive is applied. The adhesive is applied in droplets concentrated in the middle of the blade. Assembly is then achieved by applying a pressure of 20 bars to the blade; as a result the adhesive spreads over an irregular surface with undefined contours which can be controlled, to some degree, only by carefully adjusting the parameters (quantity of adhesive and pressure).
Given the above conditions, it frequently happens that the adhesive spills over onto the blade, beyond its surface that should be in contact with the lining. If the fixing zone of the blade, and this applies in particular to tripod blades, incorporates bends to produce additional bearing zones, the adhesive may even spread over onto the bends, which compromises their function by stiffening them, and can even lead to the risk of flash causing jamming.
SUMMARY OF THE INVENTION
The aim of the present invention is to eliminate the above drawbacks and to this end a disc with friction linings of the general type defined at the beginning of this description is characterise
REFERENCES:
patent: 4529079 (1985-07-01), Albertson
patent: 5601173 (1997-02-01), Thirion De Briel et al.
Bacher Michel
Federzoni Luc
Lorence Richard M.
Valeo
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