Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Coil spring
Patent
1996-11-22
1998-08-18
Reese, Randolph A.
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Coil spring
19221312, 19221331, 464 68, F16D 314
Patent
active
057952302
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
a) Field of the Invention
The invention concerns a torsion damper comprising coaxial parts mounted rotatably in relation to one another, several circumferentially acting elastic damping stages arranged between these and several friction stages acting between the said coaxial parts; the invention more particularly concerns the structure of the friction stages. Such a torsion damper can be applied notably to the friction clutch of a motor vehicle.
b) Description of Related Art
In a torsion damper of the type designated above, forming for example a friction clutch, one of the rotary parts carries a friction disc, designed to be fixed with respect to rotation to a first shaft, in practice a driving shaft, such as the crankshaft of the engine in the case of a motor vehicle, whilst another rotary part has a hub by means of which it is designed to be fixed with respect to rotation to a second shaft, in practice a driven shaft such as the input shaft of a gearbox in the envisaged case. A main damping stage comprises a hub disc having internal teeth mounted with a predetermined angular clearance on the external teeth of the said hub and two annular flanges, called guiding washers, disposed axially on either side of the said hub disc. The circumferentially acting elastic means of this main damping stage are interposed between the disc and the guiding washers. The delimitation of the possible angular movement between the hub and the hub disc is determined by the circumferential clearance between the teeth. A sub-assembly for preliminary torsion damping is often interposed between the hub and the disc in order, notably, to filter the vibrations in the idling range of the speed of the internal combustion engine of the vehicle. It comprises circumferentially acting elastic means of lesser stiffness than those of the main damping stage, acting circumferentially between two guiding washers of smaller diameter coupled to the hub disc and an auxiliary disc fixed to the hub.
Several axially acting friction stages are arranged "in parallel" with the friction stages. Of particular note is a main friction stage whose friction is controlled in order to be exerted jointly with the main damping stage. Other stages with lower friction are provided to act in lower torque ranges. In all cases, it is desirable that the load of each friction stage can be controlled easily and that the said friction stages be relatively independent of one another and can be controlled with precision.
To this end it is advantageous that the axially acting springs (in practice crinkle washers or Belleville washers) which are designed to adjust the load of the different friction stages, have relatively large diameters. However, the friction stages must not increase the axial dimension of the torsion damper.
SUMMARY OF THE INVENTION
The invention provides a satisfactory solution to all these problems.
More precisely, the invention concerns a torsion damper having several circumferentially acting elastic damping stages and several axially acting friction stages, of the type comprising a hub designed to be connected to a driven shaft and a main damping stage having a hub disc equipped with internal teeth mounted with predetermined angular clearance on external teeth of the said hub, two annular flanges or guiding washers disposed axially on each side of the said hub disc and elastic means interposed circumferentially between the disc and the said guiding washers, characterised in that a main friction stage is arranged on each side of one of the guiding washers, axially, and has two bearing washers disposed on each side of the said guiding washer and joined by braces of axial orientation passing through the said guiding washer, a friction washer coupled with respect to rotation to the said hub disc and inserted between the guiding washer and a bearing washer, and an elastic clamping washer inserted between the same guiding washer and the other bearing washer.
The arrangement as defined above allows the creation of a sub-assembly
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Dunn Eileen A.
Reese Randolph A.
Valeo
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