192 clutches and power-stop control – Clutches – Operators
Patent
1997-02-11
1999-05-04
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 91R, F16D 2508
Patent
active
058993096
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns clutch controls and more particularly hydraulic clutch controls, notably for motor vehicles.
As is known, a clutch release control has (FIG. 1) a clutch release fork 25 capable of being mounted pivoting on a fixed support such as the housing of a gearbox.
This fork 25 cooperates with a clutch release bearing 26 which, when actuated, is adapted to stop the elastic compressing action of an elastic diaphragm 27 on a thrust plate 28 of a friction clutch 29, of which a reaction plate 30 and friction disc 31 can be seen.
The means for tilting the diaphragm 27 on a cover 30A fixed to the plate 30 are depicted at 27A.
For the record, it should be stated that the clutch is normally engaged, the friction linings of the friction disc 31 being gripped between the reaction plate 30 and thrust plate 28 under the action of the elastic load exerted by the diaphragm 27.
In order to disengage the clutch, it is necessary to act here by pulling on the clutch release fork 25 in order to make it tilt and to move the clutch release bearing 26 to the left of FIG. 1 in order to make the diaphragm 27 pivot and to cancel the load exerted by the said diaphragm on the thrust plate 28 in order to release the friction disc 31.
Here the control of the clutch release fork is effected with the aid of a cable 101 actuated by the clutch pedal.
It was proposed in the document DE-A-42 20 020, notably for reasons of comfort, that the cable control be replaced by a hydraulic control.
This hydraulic control has a hydraulic receiver having a fixed cylinder mounted on a counter-support fixed to a fixed support of the vehicle and a piston engaged so as to slide sealingly in the cylinder in order to define therein a chamber of variable volume connected to a transmitter controlled by the clutch pedal.
In this document, the piston rod constitutes a control member capable of acting in traction on the clutch release fork, being mounted in an articulated manner on the said fork by means of a drive bearing.
In this type of control, the clutch release fork, when operated, effects a movement in an arc of a circle whilst the piston moves in a rectilinear manner, so that the cylinder is mounted on a counter-support fixed to the fixed support by means of a bearing made of elastic material in order to compensate for the pendular movement of the rod. This arrangement complicates the control and is not optimal in respect of the freedom of movement of the piston. In addition, it leads to a loss in efficiency owing to the presence of the elastic bearing.
The object of the present invention is to overcome these drawbacks.
According to the invention, a hydraulic control of the type indicated above is characterised in that the cylinder is of tubular shape, in that the piston is of tubular shape and has at a back end a guiding projection designed to cooperate with the internal bore of the cylinder and directed radially outwards, whilst the cylinder has at a front end a guiding projection designed to cooperate with the outer periphery of the piston and directed radially inwards, and in that the control member enters inside the piston of the receiver and is mounted at one of its ends in an articulated manner on the clutch release fork and at the other end so as to articulate on the back face of the piston of the hydraulic receiver.
According to one embodiment the control member is a cable acting between two bearings coupled respectively to the back face of the piston and to the clutch release fork.
In a variant, a rod is mounted so as to articulate on the clutch release fork and at the other of its ends so as to articulate on the back face of the piston.
By virtue of the invention, the piston is pulled by means of a cable connected to the clutch release fork or by means of a rod mounted so as to articulate on the piston and on the clutch release fork, in order to take into account the kinematic differences between the movement of the clutch release fork in an arc of a circle and the rectilinear movement of the piston.
It will be appreciated
REFERENCES:
patent: 2098674 (1937-11-01), Price et al.
patent: 2486787 (1949-11-01), Johnson
patent: 3327817 (1967-06-01), Ivanchich
patent: 3709340 (1973-01-01), Murakami et al.
patent: 4234066 (1980-11-01), Toyota et al.
patent: 5014603 (1991-05-01), Navarette et al.
patent: 5404981 (1995-04-01), Romer et al.
Bonck Rodney H.
Valeo
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