Torsion damping device for a locking clutch, especially for a mo

Details Torsion damping device for a locking clutch, especially for a mo Torsion damping device for a locking clutch, especially for a mo

1996-08-22

1998-05-26

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

F16H 4502

Patent

active

057553122

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a torsion damping device for a locking clutch capable of acting between the driving element and the driven element of a hydrokinetic coupling device, especially for a motor vehicle.
2. Description of the Prior Art
A locking clutch, usually known as a "LOCK-UP" clutch, for a hydrokinetic coupling device acting between a driving element and a driven element comprises a torsion damping device, a piston mounted movably axially in relation to the driven element, at least one friction lining associated with the piston and capable of being clamped between the piston and a counter-piston.
The torsion damping device comprises an input part, called the first portion, an output part, called the second portion, and springs placed circumferentially between the input and output parts to couple them rotationally.
Such a clutch is for example described and represented in the documents U.S. Pat. No. 4,875,562 and in International Patent Application WO/FR93/00936 (WO94/07058).
In the document U.S. Pat. No. 4,875,562, the piston is adapted to form the input part of the torsion damping device and it bears a friction lining capable of coming into contact with the transversal wall of the housing of the hydrokinetic device, this wall forming the counter-piston.
The housing belongs to a tight case filled with oil and it is capable of being connected rotationally to a driving shaft.
The output part of the damping device is integral with the turbine wheel of the hydrokinetic device.
The turbine wheel is integral with a hub capable of being rotationally connected to a driven shaft.
Thus, the case forms a driving element whereas the hub of the turbine wheel forms a driven element and the locking clutch is capable of acting between the case and the turbine wheel to perform a coupling therebetween.
In the document U.S. Pat. No. 4,875,562, the torsion damping device comprises the piston externally retaining the springs (or resilient members), and also a guide washer borne by being fixed, in this case by riveting, by the piston and which internally retains the springs thanks to retention lugs.
The piston and the guide washer have bearing lugs to act on the circumferential ends of the springs. On its outer periphery the piston also has a cylindrical annular skirt.
The input portion is thus formed by two parts, whereas the output portion comprises an annular disc which is integral with the turbine wheel.
The output disc has bearing lugs, which penetrate between the circumferential ends of two consecutive springs to act thereon.
These lugs each penetrate radially between two bearing lugs associated with the piston and the guide washer respectively.
In the document WO94/07058, the torsion damping device comprises two parts, with the guide washer being fixed on the piston. This guide washer and the disc have retention parts for retaining the springs externally and internally respectively.
Furthermore, the disc and the guide washer have bearing lugs for acting on the circumferential ends of the springs.
As described and represented in this document WO94/07058, means are specified to initially axially retain the disc inside the first portion and to allow a relative angular clearance between the two portions of the damping device, which comprise a series of snap-on lugs of the guide washer of the first portion which are folded radially inwardly in the direction of the axis of the damping device and which cooperate with the section of a cylindrical annular peripheral edge of the disc of the second portion.
Thanks to these retention means, after mounting the springs, by snapping the disc into the snap-on lugs, it is possible to create a sub-assembly which is unitary, captive, easy to handle and transportable, compiling the piston and the torsion damping device, this sub-assembly being then able to be positioned on the turbine hub.
Although the assembly of the disc with the washer by snapping between the folded parts is facilitated by the fact that the washer is

REFERENCES:
patent: 4445599 (1984-05-01), Bopp
patent: 4875562 (1989-10-01), Fujimoto
patent: 5655635 (1997-08-01), Yuergens et al.

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