192 clutches and power-stop control – Clutches – Axially engaging
Patent
1996-03-21
1998-03-17
Lorence, Richard M.
192 clutches and power-stop control
Clutches
Axially engaging
192 523, 192107M, F16D 1364, F16D 6902
Patent
active
057276650
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an engaging and disengaging clutch, particularly for motor vehicles, having at least one clutch disk and at least one counterrotating member, each of which are provided with at least one friction surface.
BACKGROUND OF INVENTION
Clutches such as the one described above are frequently embodied as so-called dry single-disk clutches, wherein the clutch disk, which is arranged on the output shaft in a manner fixed against relative rotation, is pushed against the counterrotating member via spring elements by means of a pressure plate. In such a clutch, the frictionally locked power transmission takes place between, on the one hand, the friction surface of the usually organic friction lining of the clutch disk and the friction surface of the counterrotating member and, on the other hand, between the friction surface of the friction lining disposed on the other side of the clutch disk and the friction surface of the pressure plate. The following text no longer differentiates between the friction surface of the counterrotating member and the friction surface of the pressure plate and predominantly discusses only the friction surface of the counterrotating member, which is not intended to imply that the friction surface of the counterrotating member and the friction surface of the pressure plate are embodied so as to be identical.
As a rule, the friction linings of the clutch disk are comprised of an organic material which is reinforced by means of fibers, textile materials, synthetic resin or the like and which may, depending on the requirements, also comprise, for example, metal particles or ceramic components. Particularly in dry single-disk clutches, the friction surface of the counterrotating member is comprised of the same material of which the counterrotating member and the pressure plate are made. Generally, the counterrotating member is simultaneously configured as flywheel of the drive engine and it is generally comprised of grey cast iron and, less frequently, of steel.
In general, the friction pairing of the clutch for the frictionally locked power transmission has been adjusted to the requirements that have to be met only by a corresponding selection of the friction linings on the clutch disk. But it turned out that the thus resulting friction pairings did not always meet the desired demands. In particular, for example, due to metallic components in the friction lining, the clutch disk is provided with a moment of inertia which is too high and which has a negative impact on the clutch engagement process.
SUMMARY OF THE INVENTION
It is an object of the invention to create a clutch in which it is easily possible to adjust the friction pairing to the demands that have to be met.
This object is accomplished according to the invention in that the friction material for at least one friction surface is comprised of a sintered metal material. The invention relates particularly to the embodiment of the friction surfaces of the counterrotating member and of the pressure plate from a sintered metal material. The following will mainly address the friction surface of the counterrotating member made of sintered metal material, but this is not intended to include a limitation.
The use of a sintered metal material as a friction material for the friction surface has the advantage that, on the one hand, by way of powder-metallurgical processes a material can be made available which can be optimized in a simple manner with respect to its frictional behavior, thermal conductivity and mechanical strength. On the other hand, materials can be created by means of powder metallurgy which cannot be obtained or which can only be obtained with great difficulty through casting. In an embodiment of the invention it is provided that the friction material comprises 10 to 15% weight percent copper (Cu). A special advantage of using a friction material made of a sintered metal material is that, because of its method of manufacture, the sintered metal material has a certain porosity
REFERENCES:
patent: 2902130 (1959-09-01), Halberg et al.
patent: 3191734 (1965-06-01), Batchelor et al.
patent: 3948364 (1976-04-01), Lowey
patent: 5154683 (1992-10-01), Phelps
Gonia Detlef
Manolache Valentin
Schulz Norbert
Lorence Richard M.
Raybestos Industrie-Produkte GmbH
Sinter-Metallwerk Krebsoge GmbH
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