192 clutches and power-stop control – Clutches – Axially engaging
Patent
1996-10-15
1998-10-27
Lorence, Richard M.
192 clutches and power-stop control
Clutches
Axially engaging
192 329, 2952503, 2952505, F16H 4502, F16D 1368
Patent
active
058266909
DESCRIPTION:
BRIEF SUMMARY
Priority is claimed from French patent application Ser. No. 94/13205 filed Nov. 4, 1994.
The invention relates to hydrokinetic coupling devices, especially for motor vehicles, equipped with a locking clutch, commonly known as a "lock-up" clutch, to mechanically connect the turbine wheel to the impeller wheel for rotation, and the like.
It more particularly relates to the case in which this locking clutch comprises at least one friction lining,. The friction bearing, being rotationally attached to the turbine wheel, either directly or by means of a torsion damping device, is disposed axially between, firstly, a fixed wall, i.e. a wall fixed in relation to the impeller wheel, and thus, fixed in relation to the case of the assembly, and on the other hand, a piston, which, mounted movably axially in relation to the fixed wall, is rotationally attached thereto by tongues which are substantially extended tangentially at a circumference of the assembly.
This is the case, for example, in the documents FR-A-1 051 483 and 1 203 823, in which however the locking clutch acts between a fixed wall and a separate driven shaft thereof on which the turbine wheel is locked.
One of the problems in the assembly of a locking clutch of this type involves the coupling to be provided between the tongues and the piston.
This problem more precisely relates to the fact that this coupling usually uses attachment means which require them to be acted on from both sides of the piston.
This is the case in documents FR-A-1 051 483 and 1 203 823, in which, however, the tongues couple the piston not to the fixed wall against which it has to press the friction lining or linings, but to another fixed wall, which, parallel to the preceding one, is duly rotationally connected therewith.
In such a case, the locking clutch uses several separate fixed walls, on which it is possible to act individually, and the coupling of the tongues to the piston does not give rise to any particular problem, as moreover this coupling is in practice performed at the very periphery of this piston, on lugs radially extending the piston for this purpose.
However as a result the construction for the assembly is relatively complicated and there is a notable increase in the axial spatial requirement, with the friction lining or linings acting in practice on the outside of the hydraulic chamber confined by the piston, on the side thereof opposite the fixed wall which delimits this hydraulic chamber.
The difficulties in actual fact occur when the friction lining or linings act at the periphery of the hydraulic chamber, and when, in addition, the corresponding fixed wall, which is the only one concerned, is a case wall, and, more precisely the base wall of a bell-shaped case shell inside which one or more of the friction linings and the piston extend.
This is the case, for example, in documents FR-A-2 634 849 and 2 702 262.
In these documents, various expedients are used to provide the rotational attachment of the piston to the fixed wall, which when they make tongues act, also make an additional disc act, which with these tongues and the piston forms a sub-assembly on which it is possible to act individually before performing its assembly in the case shell is to be so equipped.
In document FR-A-2 634 849, this additional disc acts inside the hydraulic chamber formed by the piston and the fixed wall, and, for its rotational attachment to the wall, it is necessary to provide a splined assembly between it and a hub borne axially by this fixed wall.
In document FR-A-2 702 262, the additional disc acts outside the hydraulic chamber formed by the piston and the fixed wall, and, for its rotational attachment to the wall, it is necessary to lock it onto the corresponding hub, by applying an appropriate deformation to the hub.
In both cases, as above, the result is a certain complication of design and of assembly.
The objects of the invention are a method for assembly which allows these drawbacks to be avoided, the locking clutch used for the application of this method, and the hy
REFERENCES:
patent: 2493700 (1950-01-01), Spase
patent: 2694478 (1954-11-01), Zeidler
patent: 4353444 (1982-10-01), Bionaz
patent: 4519736 (1985-05-01), Sigmund
patent: 5613582 (1997-03-01), Jackel
International Search Report dated Sep. 1, 1996.
Arhab Rabah
Maingaud Daniel
Lorence Richard M.
Valeo
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