Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Coil spring
Patent
1995-09-27
1998-06-30
Dunn, Eileen A.
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Coil spring
19221331, F16D 314
Patent
active
057725160
DESCRIPTION:
BRIEF SUMMARY
This application is entitled to the benefits of international application, PCT/FR94/01483, filed Dec. 19, 1994 as prescribed by 35 U.S.C. 371.
BACKGROUND OF THE INVENTION
a) Field of the Invention
The present invention relates to a damping device of the type comprising damping means which are disposed between two coaxial rotating masses, the first of which is able to be coupled to the combustion engine of a motor vehicle power unit, the second being able to be coupled to the input shaft of a gearbox of the power unit.
b) Description of Related Art
The document GB-B-2 180 322 describes and illustrates one embodiment of such a damping device, in which the damping means comprise: rotating masses so as to couple them together circumferentially; annular friction surface coupled, in rotation and axially, to the second one of the two rotating masses, and, secondly, a second annular friction surface coupled in rotation to the second one of the two rotating masses, with respect to which it is displaceable axially under the action of first resilient means, which urge it axially towards the first annular friction surface, so as to grip axially an output disc that constitutes an output member of the resilient damping mechanism; and includes at least one third annular friction surface coupled in rotation to the first rotating mass, with respect to which it is displaceable axially under the action of second resilient means which urge it axially towards an annular support surface, which is formed in facing relationship therewith and which is part of the input component of the resilient damping mechanism.
In the embodiments proposed in the said document, each of the first and second resilient means acting on the various friction liners consists of a resilient annular ring, which bears on one or other of the two rotating masses and against a support ring which is associated with one of the facing friction liners.
That solution is particularly complicated to assemble, and expensive to manufacture, in that it necessitates the use of two independent components which are manufactured separately, as well as the provision of abutments on each of the masses, for engagement of the first and second resilient means respectively.
In addition, there is no functional connection between the two friction damping mechanisms that takes account of progressive wear in the various liners. These mechanisms are carried by the second mass and the first mass respectively.
SUMMARY OF THE INVENTION
An object of the present invention is to propose a novel design for a damping device which enables the drawbacks which have been described above to be overcome.
To that end, the invention proposes a damping device of the type described above, characterised in that the friction damping mechanisms are carried by the second mass, and in that the first and second resilient means are made as a single component which comprises a resilient ring and a set of resiliently deformable radial fingers, and which is interposed between the second rotating mass and the first annular friction surface and between the second rotating mass and the third annular friction surface.
Thanks to the invention, the number of components is reduced, and the solution is very compact in the axial direction, due to the fact that the resilient component in accordance with the invention provides a functional coupling between the two damping mechanisms. In addition, the radial fingers may be of substantial length, which enables the force exerted by the fingers to be closely controlled, and to be differentiated from that which is exerted by the resilient ring. Moreover, there is no need to provide an abutment on the first mass, which enables the latter to be simplified. Thus, with reference to the document GB-B-2 180 322, the shouldered circlip which is provided for engagement by the resilient means is eliminated.
In accordance with further features of the invention: the second rotating mass and a second support surface formed on a support ring of a second friction liner, one annular s
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patent: 5139124 (1992-08-01), Friedmann
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