192 clutches and power-stop control – Vortex-flow drive and clutch – Including drive-lockup clutch
Patent
1999-01-07
2000-09-26
Lorence, Richard M.
192 clutches and power-stop control
Vortex-flow drive and clutch
Including drive-lockup clutch
192 7018, F16H 4502
Patent
active
061231770
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to hydrokinetic coupling apparatus, especially for motor vehicles, such as is described or example in the document WO-A-94/07058.
In that document, the apparatus includes a generally transversely oriented wall which is arranged to be coupled in rotation to a driving shaft, and which carries, fixed thereto, a central guide ring.
A piston is mounted for axial movement sealingly along the guide ring, and defines, with the transverse wall and with the guide ring, a variable volume chamber which is bounded on the outside by a disc, together with friction liners which are adapted to be gripped, respectively, between the piston and the disc and between the disc and the transverse wall.
Each friction liner is fixed to one of the elements consisting of the disc, the piston and transverse wall between which it is adapted to be gripped.
2. Background of the Related Art
It has previously been proposed, in the document FR-A-2 634 849, to couple the piston in rotation to the axially fixed transverse wall, with axial mobility being obtained by means of tangentially oriented tongues which are fixed to a driving member disposed in the variable volume chamber.
In practice, this driving member is in the form of a disc which is fixed by a splined coupling to the guide ring carried centrally by, and fixed to, the transverse wall.
As a result, the fitting of the guide ring on the transverse wall is not as easy as might be desired, because the guide ring is equipped in advance with the disc carrying the tangential tongues coupled to the piston.
In addition, the solution is neither simple nor inexpensive, because of the splined mounting of the disc on the guide ring.
In addition, the feed to the variable volume chamber has to be obtained with the aid of channels which are formed in a known way in the ring, and the channels have to be arranged in such a way as to have regard to the presence of the disc, the nature of this arrangement being such as to increase the axial distance between the piston and the transverse wall.
An object of the present invention is to reduce these disadvantages in a simple and inexpensive way, while continuing to benefit from easy sliding of the piston along the guide ring.
SUMMARY OF THE INVENTION
According to the invention, a hydrokinetic coupling apparatus comprising a lock-up clutch of the type defined above wherein the driving member for the tongues is fixed by welding or adhesive bonding to the transverse wall, and in that the tongues are fixed to the piston with the aid of fastening means which extend generally through the tongues and the piston. The fastening means includes.sub.-- a first part attached to the tongues and bearing on the tongues on the opposite side of the tongues from the piston, together with a second part bearing on the side of the piston opposite to the tongues and being engaged with the first part.
Thanks to the invention, the guide ring is simplified, because no splined coupling need be provided, since the driving member is secured to the transverse wall by welding.
Another result of the invention is that it is possible to locate the feed channels for the variable volume chamber in a desired way because no disc is fixed on the guide ring. This also enables the axial dimension between the transverse wall and the piston to be reduced. In addition, advantage is taken of the configuration of the axially fixed transverse wall. In this connection, this wall has, in its middle part, a portion which projects axially away from the piston with respect to the central part of the wall. It is in this middle wall portion that the driving member is fitted, which enables axial size to be reduced.
The driving member may be positioned with respect to the transverse wall prior to the welding or adhesive bonding, for example with the aid of a removable jig which enables the first part of the fastening means to be centred with respect to the transverse wall. This jig includes for example a centring piece which
REFERENCES:
patent: 4353444 (1982-10-01), Bionaz
patent: 5613582 (1997-03-01), Jackel
patent: 5826690 (1998-10-01), Maingaud et al.
Lorence Richard M.
Valeo
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