192 clutches and power-stop control – Elements – Engaging surfaces
Reexamination Certificate
2000-01-13
2001-07-31
Marmor, Charles A (Department: 3681)
192 clutches and power-stop control
Elements
Engaging surfaces
C192S052600
Reexamination Certificate
active
06267216
ABSTRACT:
INTERNATIONAL PATENT APPLICATION NO. PCT/FR99/00161, PUBLICATION NO. WO99/39110
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a friction disc, especially for a motor vehicle clutch.
2. Description of Related Art
More particularly the invention is concerned with a friction disc of the same type as that described and shown in the document EP-A-0 579 554.
That document describes and shows a friction disc comprising a plate for supporting friction liners in the form of a ring, with its outer peripheral portion being divided into radial blades carrying friction liners which are arranged, in particular, axially on either side of the support plate, with each blade being of tripod type and having, by virtue of folds, a central engagement zone which is joined to the central portion of the plate, together with two peripheral engagement zones which are arranged tangentially on either side of the central engagement zone.
This design, in which the tripod type blades have a form which is generally symmetrical with respect to a radial axis of symmetry, enables the blades to have as great a resistance to centrifugal force as is desired, with the central engagement zone serving to fasten a first one of the friction liners, while the peripheral engagement zones are arranged to come into contact with the second one of the friction liners.
In addition, contact with, in particular, the pressure plate of the clutch is greatly improved by avoiding the situation where the zone in which the friction liners are subjected to the pressure from one or other of the two plates between which the friction disc is gripped, is displaced progressively towards the axis of the assembly, so wear in the friction liners is thus generally even and regular.
The design according to the prior art accordingly proposes a standard carrier disc for liners which is able to rotate at high speed while reducing seizing and jamming effects, and is at the same time capable of adopting a conical form.
The present invention is concerned with an improvement to a friction disc of the same type as that described and shown in the document EP-A-0 579 554, which in particular gives a further increase in the capacity to resist centrifugal force and/or to resist deformation resulting in variations in operating temperature, these effects most particularly affecting the peripheral engagement zones of each tripod type blade.
SUMMARY OF THE INVENTION
To this end, the invention proposes a friction disc characterised in that each of the peripheral engagement zones is joined to the central portion of the plate.
According to further features of the invention:
each tripod type blade has an axis of radial symmetry;
each central engagement zone is joined to the central zone of the plate by means of a tangential fold at right angles to the axis of radial symmetry of the tripod blade that constitutes the foot of the blade, and enables the central engagement zone to be offset axially with respect to the general plane of the central zone of the plate;
each central engagement zone is joined to the peripheral zones by means of folds which are oblique with respect to the axis of radial symmetry of the tripod type blade;
the peripheral engagement zones are offset axially with respect to the plane of the central engagement zone, being parallel to the latter;
the peripheral engagement zones lie in the plane of the central portion of the plate;
the peripheral engagement zones are offset axially with respect to the plane of the central portion of the plate;
each of the peripheral engagement zones is joined to the central portion of the plate by a generally radially oriented band;
the connecting band extends substantially parallel to the adjacent oblique fold that joins the corresponding peripheral engagement zone to the central engagement zone;
each of the said peripheral engagement zones is joined directly to the central portion of the plate by a connecting band coplanar with the central portion of the plate and the peripheral engagement zone;
the connecting bands of two neighbouring peripheral engagement zones which are part of two consecutive tripod type blades, are formed as a single connecting band oriented generally radially;
the connecting bands of two neighbouring peripheral engagement zones which are part of two consecutive tripod type blades are independent of each other;
the said tripod type blades are arranged in circumferential alternation with a series of radial tongues, each of which has at its free end, by virtue of a fold, a supplementary engagement zone;
the supplementary engagement zone is joined to the central portion of the plate by means of a tangential connecting fold at right angles to the axis of radial symmetry of the tongue;
each peripheral engagement zone is joined to the central portion of the plate by a connecting band, the radially inner end of which is situated radially inward of the tangential connecting fold of the supplementary engagement zone of the neighbouring radial tongue;
each central engagement zone comprises a radially inner portion and a radially outer portion which is narrower in the circumferential direction than the inner portion;
each central engagement zone is bounded radially by an arcuate outer edge;
each central engagement zone is bounded radially by a rectilinear tangential outer edge;
each radial tongue is bounded radially by an arcuate outer edge;
the tripod type blades are distributed as two sets of blades, the peripheral engagement zones of the blades of one of the sets and their connecting bands being in the plane of the central engagement zone of the blades of the other set.
REFERENCES:
patent: 4993531 (1991-02-01), Villata
patent: 5452783 (1995-09-01), Thirion de Briel et al.
patent: 5522490 (1996-06-01), Thirion de Briel et al.
patent: 5601173 (1997-02-01), Thirion de Briel et al.
patent: 5794754 (1998-08-01), Villata
patent: 5934434 (1999-08-01), Viola
patent: 6015035 (2000-01-01), Mizukami
patent: 0579554A2 (1994-01-01), None
De Briel Jacques Thirion
Honore Emmanuelle
Liniak, Berenato, Longarce & White
Marmor Charles A
Rodriguez Saul
Valeo
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