192 clutches and power-stop control – Clutches – Axially engaging
Patent
1999-02-16
2000-04-25
Lorence, Richard M.
192 clutches and power-stop control
Clutches
Axially engaging
192111A, F16D 1375
Patent
active
060532963
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns friction clutches, notably for motor vehicles.
It relates more particularly to friction clutches having a wear take-up device.
2. Description of the Related Art
As is known, a friction clutch has at least one friction disc provided at its external periphery with friction linings, possibly divided, intended to be clamped between a flywheel, forming a reaction plate, and a thrust plate.
The flywheel is formed so as to be connected with respect to rotation to a first shaft, whilst the friction disc is formed so as to be connected with respect to rotation to a second shaft.
In the case of an application for motor vehicles the first shaft is a driving shaft, whilst the second shaft is a driven shaft, namely the input shaft of a movement transmission box, usually the input shaft of the gearbox. The flywheel, possibly in two parts in order, for example, to form a double torsion damping flywheel, is fixed centrally to the engine crankshaft by means of fixing members, such as screws, whilst the friction disc conventionally has a central hub fluted internally in order to connect it with respect to rotation to the said input shaft. This hub is rigidly or elastically coupled to the friction linings.
The thrust plate is connected with respect to rotation, with axial freedom of movement, to the flywheel and has at its front a friction face for the friction linings, whilst the flywheel has on its back a friction face for the said linings.
Axially acting elastic means bear on a cover and act on the rear face of the thrust plate in order to clamp the friction linings between the friction faces of the flywheel and of the thrust plate.
These elastic means are therefore engagement means tending to bring the thrust plate close to the flywheel in order to clamp the friction linings.
The cover is hollow in shape and is formed at its external periphery so as to be fixed to the flywheel by means of fixing means.
These fixing means can be of any type and can consist for example of welding and/or crimping means. Usually the thrust plate forms part of a unitary assembly, referred to as a engagement mechanism, including the thrust plate, the engagement means and the cover.
This unitary assembly also includes disengagement means associated with the engagement means in order to counteract the action of the engagement means. The thrust plate is in this case connected with respect to rotation, with axial freedom of movement, to the flywheel by means of the first means of connection with respect to rotation. For example, the thrust plate has at its external periphery, projecting radially, lugs, forming tenons, engaged in grooves, forming mortises, provided axially in an axially oriented cylindrical skirt which the cover has at its external periphery. This skirt is connected, at one of its axial ends, to a base with a central hole and oriented transversely. The base is directed radially inwards. At its other axial end, the skirt is fixed to the flywheel by means of the aforementioned fixing means. Thus the thrust plate is connected with respect to rotation by means of a connection through cooperation of shape of the mortise and tenon type.
Conventionally, the means of connecting with respect to rotation, with axial freedom of movement, consist of elastic tongues elongated circumferentially in the form of an arc of a circle or of tangential orientation. These tongues, distributed in several groups of one or more superimposed tongues, are fixed at one of their ends to the thrust plate, for example to radial lugs thereon, and at the other end to the cover, for example to a radial area thereon.
The tongues constitute return means and provide return of the thrust plate in the direction of the base of the cover in order to disengage the clutch, that is to say to release the friction linings of the friction disc so that they do not come to brush against the friction faces of the flywheel and of the thrust plate.
The engagement means can consist of a plurality of
REFERENCES:
patent: 4195719 (1980-04-01), Corral Martinez
patent: 5139124 (1992-08-01), Friedmann
patent: 5404979 (1995-04-01), Craft et al.
Lorence Richard M.
Valeo
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