192 clutches and power-stop control – Elements – Engaging surfaces
Patent
1995-05-22
1997-02-11
Pitts, Andrea L.
192 clutches and power-stop control
Elements
Engaging surfaces
192107R, 192 7014, 188 732, F16D 1364
Patent
active
056011733
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
a) Field of the Invention
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.
b) Description of Related Art
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, and during a hill start.
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, while 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, which is offset axially with respect to the peripheral support zones and the central portion.
In one embodiment, the said blades are in circumferential alternation with a series of tongues.
In another embodiment, the said blades are arranged in circumferential alternation with a second series of blades of the tripod type, in the image of the first series.
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, or the tripod blades of the second series, have sufficient elasticity to follow the tendency of the reaction plate to adopt a conical form, while the tripod blades follow the tendency of the pressure plate to adopt a conical form, and have large contact surfaces.
In addition, embedding and judder effects are reduced, and the blades are able to rotate at higher speeds, which eliminates bending forces in the blade feet caused by centrifugal force.
In the said document, fastening of the friction liners is achieved by means of a row of rivets arranged on a common pitch circle. As a result, the central zone of the first series of tripod blades is provided with an aperture for passage through it of a rivet which constitutes a fastening member.
The same is true of the tongues or of the central zone of the second serie
REFERENCES:
patent: 2008169 (1935-07-01), Blackmore et al.
patent: 2027650 (1936-01-01), Nutt
patent: 2195666 (1940-04-01), Wolfram
patent: 2618369 (1952-11-01), Zeidler
patent: 2902130 (1959-09-01), Halberg et al.
patent: 3237740 (1966-03-01), Wilson
patent: 4108699 (1978-08-01), de Gennes
patent: 4993531 (1991-02-01), Villata
patent: 5413202 (1995-05-01), Maucher
patent: 5452783 (1995-09-01), Thirion de Briel et al.
Blard Michel
De Briel Jacques Thirion
Villata Gino
Pitts Andrea L.
Valeo
LandOfFree
Liner support disc for supporting friction liners, especially fo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Liner support disc for supporting friction liners, especially fo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liner support disc for supporting friction liners, especially fo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-335929