Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Coil spring
Patent
1998-09-28
2000-11-14
Bonck, Rodney H.
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Coil spring
192214, F16F 15123, F16F 15129
Patent
active
061462799
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
This invention relates to torsion damping devices of the kind comprising at least two coaxial parts mounted for rotation of one with respect to the other within the limits of a predetermined angular displacement and against the action of circumferentially acting resilient members, one of the said coaxial parts comprising a hub plate while the other comprises a support plate fixed to two guide rings which flank and are spaced away from the hub plate, and each of the resilient members being mounted partly in seatings formed in the hub plate and partly in corresponding seatings formed in the guide rings.
DESCRIPTION OF THE RELATED ART
This is for example a clutch friction wheel for a motor vehicle.
In such a case the friction disc, comprising a radial support plate which carries friction liners at its periphery, is fixed through its support plate to one of the guide rings.
In practice, axially acting friction means are provided.
These means conventionally comprise an axially acting resilient ring, which bears on one guide ring and on an application ring which is coupled in rotation to the same guide ring so as to grip a friction ring between the hub plate and the other guide ring.
A large number of components is therefore provided.
An object of the present invention is to reduce the number of components in a simple and inexpensive way.
SUMMARY OF THE INVENTION
According to the invention, a torsion damping device of the type described above is chlaracterised in that one of the guide rings, referred to as the second guide ring, includes press-formed elements which may be joined together continuously and which are directed towards the hub plate, and in that the support plate is firstly arranged on the other side of the hub plate with respect to the second guide ring, and secondly has, in facing relationship with the press-formed elements, lugs which are elastically deformable in the axial direction and which act on the hub plate so as to urge the press-formed elements towards the hub plate.
Thanks to the invention the number of components is reduced, because the axially acting resilient ring of the prior art is replaced by the support plate, while the second guide ring is more rigid.
In one embodiment, a ring having a predetermined coefficient of friction may be interposed axially between the hub plate and the support plate, and/or between the hub plate and the press-formed elements of the second guide ring, so as to avoid metal-to-metal frictional contact.
This ring may be fixed to one of the elements consisting of the hub plate or press-formed elements or support plate, or it may be mounted free.
It may be replaced by a coating deposited on one of the elements consisting of the hub plate, the support plate or the press-formed elements.
In one embodiment, the support plate and/or the press-formed elements bear directly on the hub plate so as to reduce the number of components even more.
The axially resiliently deformable lugs are preferably formed by stamping and bending.
By a suitable choice of the form of the cut-outs and of the bending configuration, it is possible to obtain a stiffness which enables manufacturing tolerances to be taken care of.
The support plate may carry the friction liners, or it may be connected directly to a driving flywheel fixed in rotation to a first shaft such as a driving shaft, while the hub is coupled in rotation to a second shaft such as a driven shaft.
In the first case, the friction liners are arranged to be coupled releasably to the drive shaft. The seatings in the guide rings may be of any appropriate form, and consist of windows.
The support plate may be fixed to a third guide ring or it may constitute by itself a first guide ring, with, for each of the windows in the guide rings and for satisfactory retention of the resilient members, at least two flanges, commonly called eyelids, which project from the side opposite to the hub plate, namely an upper flange which extends along the circumferential edge which is radia
REFERENCES:
patent: 4398625 (1983-08-01), Beccaris
patent: 4548309 (1985-10-01), Braun
patent: 4848551 (1989-07-01), Caspar
patent: 5836820 (1998-11-01), Reik et al.
Lebas Gilles
Tauvron Fabrice
Bonck Rodney H.
Valeo
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