Lock-up clutch and hydrokinetic device comprising the same

Details Lock-up clutch and hydrokinetic device comprising the same Lock-up clutch and hydrokinetic device comprising the same

1996-07-08

1998-09-01

Marmor, Charles A.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192212, F16H 4502

Patent

active

057997616

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

a) Field of the Invention
This invention relates to hydrokinetic coupling devices, especially for motor vehicles, which are equipped with a locking clutch commonly called a "lock-up" clutch, for coupling mechanically together in rotation their turbine wheel with their impeller wheel.
b) Description of Related Art
It is more particularly directed to the case where the said lock-up clutch includes, firstly, a piston which is mounted for axial movement with respect to an axially fixed driving wall, with friction means between it and the said driving wall for coupling it in rotation to the latter, and secondly, on the other side of the piston with respect to the driving wall, a driven wall which is adapted to be coupled in rotation to the turbine wheel of the hydrokinetic coupling device, and with resilient damping means interposed circumferentially between the said piston and the said driven wall.
This is the case, for example, in the document WO-A1-94/07058, in which various embodiments are proposed, especially as regards the first engagement zones which are part of a damper plate, and on which the resilient damping means bear circumferentially at their ends through their middle zone, and as regards the second engagement zones which are part of a guide ring on which the resilient damping means bear circumferentially at their ends through their lateral zones.
A common feature of all of these embodiments is that the damper plate, with which the second zones for engagement of the resilient damping means are associated, is constituted by the driven wall, to which the turbine wheel is fixed.
As a result, in line with at least these resilient damping means, the said driven wall lies spaced away from the piston, which is a disadvantage for the axial overall size of the assembly.


SUMMARY OF THE INVENTION

A main object of the invention is to provide a lock-up clutch of the said kind in which, by contrast, the driven wall extends at least in line with the resilient damping means on the side of the said resilient damping means that faces axially towards the piston, being adjacent to the said piston; it is also directed to any hydrokinetic coupling device including such a lock-up clutch.
Since, according to the invention, the driven wail lies as close as possible to the piston, the piston is itself as close as possible to the turbine wheel, and this leads to improved axial compactness of the assembly.
In practice, and in accordance with a feature of the invention, the piston is fixed in rotation to first engagement zones on which the resilient damping means bear circumferentially at their ends through their middle zone, defining, for example, the said first engagement zones by an integral U-shaped return portion, while the driven wall is fixed to second engagement zones on which the resilient damping means bear circumferentially at their ends through their lateral zones, defining, for example, the said second engagement zones by integral lugs which are substantially parallel to the axis of the assembly.
Thus, the piston has the advantage of remaining sealed, and it is the driven wall that carries the second zones for engagement with the resilient damping means, the said second engagement zones being flanked radially by the first engagement zones, which are therefore carried by the piston.


BRIEF DESCRIPTION OF THE DRAWINGS

The objects of the invention, their features and their advantages, will appear more clearly from the following description, by way of example and with reference to the attached diagrammatic drawings, in which:
FIG. 1 is a half view in axial cross section of a lock-up clutch in accordance with the invention;
FIGS. 2 and 3 are half views in axial cross section, each of which, being similar to that in FIG. 1, relates, respectively, to another embodiment of the invention.


DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

As shown in the drawings, these show generally a lock-up clutch 10, which is intended for equipping a hydrokinetic coupling device, not all of which is sho

REFERENCES:
patent: 4274519 (1981-06-01), Morota et al.
patent: 4890706 (1990-01-01), Miura et al.
patent: 5224576 (1993-07-01), Fujimoto
Patent Abstracts of Japan vol. 4 No. 77 (c-10304), Jun. 4, 1980 & JP A 55-041908 (Hinode Kinzoku Netsuren KK) Mar. 25, 1980.

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