192 clutches and power-stop control – Clutches – Operators
Patent
1998-05-21
2000-04-04
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 59, 192 91A, F16D 1900, F16D 2508
Patent
active
060449500
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to hydraulic control systems for clutches, especially for motor vehicles.
More particularly it relates to the receiver for such a control system.
2. Description of the Related Art
As is known, the receiver, which is also referred to as an actuator, of such a control system comprises two parts in cylinder-and-piston relationship, namely a first part or fixed part, for fastening the control means on a fixed structure such as the casing of a gearbox, and a second part, or moving part, which typically consists of a piston sliding axially and mounted inside a blind cavity which is defined by the fixed part, the latter being hollow.
This cavity is arranged to be pressurised and to be depressurised.
In this way, with the piston, a variable volume chamber is defined.
For this purpose, the fixed part includes a feed inlet connected to the cavity.
The control fluid may be gaseous, such as compressed air, or liquid, for example oil, the control system being generally referred to as a hydraulic control system.
The feed inlet is connected to the emitter of the control system through a duct. This emitter is actuated by the clutch pedal, or, in a known way, by an actuator which has for example an electric motor actuating the piston of the emitter through an interposed mechanical transmission.
The electric motor is governed by a computer which receives information from sensors, which are associated in particular with the gear change lever and with the driving and driven shafts, so as to measure the speed of rotation of these latter.
The fixed part of the receiver includes for example ears for fastening it on a fixed part such as the casing of the gearbox.
For more detail, reference should be made to the document WO96/24781.
In another version, the fixed part comprises at least one external body, a sole plate arranged to be fixed on the casing of the gearbox, and bayonet mounting means interposed between the external body and the sole plate, which is preferably of metal.
Thus, the external body may be standardised, while the sole plate serves as an adaptor and is configured according to the application, and more precisely as a function of the form of the fixed part on which it is fastened.
Such an assembly is described for example in the document FR-96 02591 filed on Feb. 26, 1996.
In those two documents, the cavity is defined by an external body of mouldable material, and by a concentric internal tube.
The components are arranged coaxially and concentrically.
The tube is of metal and constitutes a support and guiding member for the piston that actuates the clutch release bearing of the clutch.
For the best explanation, reference should be made to FIG. 1, which corresponds to FIG. 2 in the document WO-A-96/24781.
Thus, shown at 1 is a conventional clutch of the push-to-release type, in which the declutching device consists of the fingers of a diaphragm 13, on the inner ends of which there acts a clutch release bearing 3 which, in this case, is part of the receiver 2 of the hydraulic clutch control system.
In another version, the declutching device of the clutch may consist of declutching levers acting on springs which are mounted between the cover plate 14 and the pressure plate 12 of the clutch. Auxiliary springs may be provided. These springs may act in series, or in parallel with the diaphragm. A series arrangement is described for example in the document FR-97 11058 filed on Sep. 5, 1997, with the clutch being then able to be equipped with a wear compensating device to compensate for wear in the friction liners 16 of the disc 11.
In this Figure, by way of example, the diaphragm 13 is mounted for pivoting movement on the cover plate by means of short posts 20.
The diaphragm 13 acts on the pressure plate 12 through its Belleville ring portion, so as to grip the friction liners 16 of the friction wheel 11 between the pressure plate 12 and the reaction plate 10 of the clutch.
In the context of an application to a motor vehicle, the torque
REFERENCES:
patent: 4561531 (1985-12-01), Young et al.
patent: 5211099 (1993-05-01), Grosspietsch et al.
patent: 5547058 (1996-08-01), Parzefall et al.
patent: 5620076 (1997-04-01), Voit et al.
Rey Frederic
Thomire Sylvain
Bonck Rodney H.
Valeo
Waddell Tisha D.
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