192 clutches and power-stop control – Clutches – Operators
Patent
1998-05-21
2000-01-25
Marmor, Charles A.
192 clutches and power-stop control
Clutches
Operators
192 85CA, F16D 1900
Patent
active
060168986
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to hydraulic connectors, for a hydraulic clutch control unit, which is provided with a feed inlet for its control chamber and is mounted within a hood, such as the casing hood of the gearbox of a motor vehicle, comprising, firstly, a plate for fastening the said connector on the hood and for covering at least a major part of an aperture formed in the hood for giving access to the feed inlet, and secondly, a feed duct (5) carried by the said plate for connecting the feed inlet of the said control unit to an emitter governing the latter.
Such a connector is described in the document FR-A-2 698 931.
The control unit is for simplicity referred to as a hydraulic clutch control unit, given that its control chamber may be fed with a fluid which is liquid such as oil, or gaseous such as compressed air.
In the known way, a clutch is disposed downstream of a driving shaft for controlling the driving of a driven shaft.
The clutch usually includes, firstly, on the driving shaft side, a primary bloc comprising a flywheel, which may be of divided form and which drives in rotation a hub which is fixed disengageably to the flywheel, and a declutching device which is arranged to control disengagement of the hub from the flywheel when it is subjected to appropriate action in the axial direction, and secondly, on the driven shaft side, a secondary bloc comprising a clutch release bearing which is maneuvered by a control unit so as to act axially on the declutching device of the clutch, which consists usually of a diaphragm, or, in another version, of declutching levers which act on helical springs.
For more details, reference should for example be made to Application FR-A-2 698 931 mentioned above, given that usually, the primary bloc includes a clutch mechanism which is attached on the driving flywheel after the fitting in place of a clutch friction wheel, which includes friction liners coupled rigidly or elastically to the hub and adapted to coupled in rotation to the input shaft of the gearbox in the context of application to a motor vehicle, the flywheel then being arranged to be fixed in that case on the crankshaft of the internal combustion engine of the vehicle.
The clutch mechanism includes a cover plate which is arranged to be fixed on the driving flywheel, which constitutes a reaction plate. The diaphragm or the helical springs bear on the cover plate so as to act on a pressure plate which is coupled in rotation to the cover plate but with axial mobility, typically by means of resilient tongues.
Thus the diaphragm (i.e. the Belleville ring portion of the latter), or the helical springs, bias the pressure plate towards the reaction plate in order to grip the friction liners between the said plates.
The clutch is thus normally engaged. In order to disengage the latter it is necessary to act axially on the declutching device in a pulling mode or a pushing mode, using a clutch release bearing, so as to cause the action of the diaphragm or helical springs to cease and so release the friction liners.
The said clutch release bearing is here maneuvered by the hydraulic clutch control unit, which comprises two parts in piston-and-cylinder relationship, namely a fixed part defining a cavity and a movable part consisting of a piston, which is movable within the said cavity so as to define with the latter a variable volume control chamber.
The fixed part includes a feed inlet for feeding the cavity and therefore the control chamber. This control unit is mounted within a hood. The function of the hydraulic connector is to enable the hood to be passed through in order to connect from outside the hydraulic clutch control unit, constituting a receiver, to a feed duct coming from an emitter.
In order to achieve these things it is usual to provide, firstly, individual mounting of the primary bloc from the driving flywheel, and secondly, individual mounting of the secondary bloc from, for example, the casing of the gearbox, and then to assemble these blocs together by bringing them together axially. It i
Marmor Charles A.
Valeo
Waddell Tisha D.
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