192 clutches and power-stop control – Elements – Engaging surfaces
Patent
1994-11-17
1996-06-04
Lorence, Richard M.
192 clutches and power-stop control
Elements
Engaging surfaces
192 526, F16D 1364
Patent
active
055224903
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a liner support disc for supporting friction liners, adapted to constitute a clutch friction wheel, especially for a motor vehicle, of the kind comprising a central portion and a peripheral portion divided into radial blades for receiving the friction liners, with each of the said blades being joined integrally to the said central portion through a foot, and comprising at least one support zone which is generally parallel to the mean plane of the said central portion, for contact with at least one of the said friction liners and for fastening of the latter. In a clutch friction wheel, the said liners lie on either side of the peripheral portion.
Clutch friction wheels are sometimes subject in operation to disagreeable vibrations constituting what is often called judder. This judder is just as likely to occur at low torques, during a parking manoeuvre, as at high torques during a gear change when travelling.
The support zones are sometimes not as large as desired, which gives rise to an embedding effect in which the friction liners become embedded in the hollows that exist between two support surfaces of the same blade. This gives rise to a lack of flexibility, which is at least partly responsible for judder effects at maximum load.
In addition, there is a problem of contact with, in particular, the pressure plate of the clutch.
In this connection, in a clutch, each time the clutch is engaged, the friction liners become progressively gripped between a pressure plate and a reaction plate.
The heating which is caused by the friction leads inevitably to deformation of the pressure plate into a conical form as is explained for example in the document U.S. Pat. No. 2,902,130, and the same is true, though to a lesser extent, for the reaction plate. As a result, the zone in which the friction liners are subjected to the pressure from one or other of these plates becomes progressively offset towards the axis of the assembly, with consequent unequal wear of the said friction liners and a reduction in their efficiency (i.e. reduced torque transmission), and even the occurrence of judder effect.
In order to overcome these drawbacks and to resolve this problem, it has been proposed in the document EP-A-0 579 554 to provide blades of the tripod type which have a central support zone and two peripheral support zones on either side of the said central zone.
The central zone is offset axially with respect to the peripheral support zones, and with respect to the central portion.
In one embodiment, the said blades are in circumferential alternation with a series of tongues.
The tripod blades serve for the fastening, in their central zone, of one of the friction liners, in this case the one which is associated with the pressure plate of the clutch, while the tongues serve for the fastening of the other friction liner, in this case the one that is associated with the reaction plate of the clutch.
By virtue of this arrangement, the tongues have sufficient elasticity to follow the tendency of the reaction plate to adopt a conical form, with the tripod blades following the tendency of the pressure plate to adopt a conical form and having a large circumferential length with large contact surfaces.
In addition, the embedding and judder effects are reduced, and the blades are able to rotate at higher speeds.
When the friction liners are progressively and elastically gripped between the pressure and reaction plates, the friction liner, which may be of divided form and which is associated with the pressure plate, is well supported because there is a reaction force on the other friction liner via its peripheral support zones.
The same is not true for the other friction liner, which may be of divided form and which is carried by the tongues. As a result, those zones of the liner that face the tongues wear less slowly, the result of which is wear of the liner that is not well distributed.
An object of the present invention is to overcome these drawbacks.
According to the invention, a liner support disc of
REFERENCES:
patent: 2566394 (1951-09-01), Zeidler
patent: 2902130 (1959-09-01), Halberg et al.
patent: 4108699 (1978-08-01), de Gennes
patent: 5014842 (1991-05-01), Graton et al.
Blard Michel
Dalbiez Andre
De Briel Jacques Thirion
Villata Gino
Lorence Richard M.
Rodriguez Saul
Valeo
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