Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
1999-12-06
2001-10-23
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
Reexamination Certificate
active
06305166
ABSTRACT:
The present invention relates to a hydraulic-reaction master cylinder comprising: a cylindrical body delimiting a variable-volume working chamber filled with a brake fluid; a main piston mounted so that it can slide selectively in the working chamber in a first axial direction to reduce the volume of this working chamber; an axial bore pierced in the main piston and delimiting a variable-capacity reaction chamber subject to a variable pressure; a reaction piston closing the reaction chamber and mounted so that it can slide selectively in the axial bore in the first axial direction to reduce the capacity of the reaction chamber; and a non-return valve selectively allowing fluid to flow from the reaction chamber to the working chamber, the reaction chamber being annular in shape and communicating selectively with the working chamber through an axial passage or through the non-return valve, the reaction piston being stepped and having an axial stub, capable of selectively closing off the axial passage.
BACKGROUND OF THE INVENTION
A master cylinder of this type is incorporated into the braking device described in the prior art by patent EP—0,662,894.
Such a braking device has the advantage of optimizing the intensity of the braking force in the event of an abrupt application of the brakes, particularly by delaying the rise in reaction force that opposes this braking force.
More recently, in the design of braking systems, there has arisen the desire to be able to vary the reaction force in inverse proportion to the gradient of the braking effort, so as to optimize the use of braking energy exerted by the driver in the event of intense and sharp braking.
SUMMARY OF THE INVENTION
The present invention falls within this context and its object is to provide a hydraulic-reaction master cylinder which has a simple structure and offers this feature.
To this end, the master cylinder of the present invention, which in other respects is in accordance with the generic definition given in the above preamble, is essentially characterized in that the valve is annular in shape and comprises a sealing cup held in an annular cage which defines the axial passage and which is pierced with axial orifices selectively allowing fluid to flow from the reaction chamber to the working chamber by deformation of, and flow around, the cup.
According to one possible embodiment of the invention, the stub may be passed through by a drilling which communicates with the reaction chamber, the non-return valve being installed on one end of the drilling, which communicates with the working chamber.
REFERENCES:
patent: 5921084 (1999-07-01), Gautier et al.
patent: 5941071 (1999-08-01), Simon Bacardit
patent: 6079208 (2000-06-01), Verbo et al.
Jacques Carré
Leboisne Cedric
Bosch Systemes de Freinage
Comstock Warren
Lazo Thomas E.
Look Edward K.
McCormick Jr. Leo H.
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