Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1993-08-06
1995-12-19
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031162, 303DIG2, 13762519, B60T 1520
Patent
active
054763126
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a hydraulic brake device, capable of being actuated directly or automatically, and comprising at least: on an outlet, and which is capable of being controlled by a brake pedal so as to constitute a first source of high hydraulic pressure, of being controlled automatically so as to constitute a second source of high hydraulic pressure, about the braking of a driving wheel, about the braking of a non-driving wheel, pressure link and links connecting the outlets of the sources of high pressure to the receivers, associated with the first and second receivers respectively, each of them being capable of being controlled so as to connect the corresponding receiver selectively to the low pressure or to a source of high pressure, and network of links in accordance with instructions received by this distributor, this distributor comprising a body pierced with a bore in an axial direction between two extreme positions, under the control of the pressure of at least one source of high pressure, so as to selectively to connect the outlet of the master cylinder and the inlet of the pump.
BACKGROUND OF THE INVENTION
Devices of this type are well known and are in particular used in brake systems making it possible to avoid a locking of the wheels in the case of heavy braking on a surface having insufficient adhesion and a spinning of the driving wheels in the case of acceleration which is too fierce to drive the vehicle.
One problem which constantly arises in the design of such systems is that which consists in preventing the relative complexity of the functions brought into play from being accompanied by a comparable complexity of the means used in order to perform these functions.
SUMMARY OF THE INVENTION
In this context, the object of the present invention is to provide a brake device with a distributor wherein the latter, although of simple design and of modest cost, can fulfill a plurality of functions.
To this end, the device of the invention is essentially characterized in that the slide valve is capable of moving in the bore between a neutral position and each of the two extreme positions located on either side of the neutral position, the slide valve moving towards the first and second exteme positions, against respective first and second resilient forces, under the effect of a pressure rise in respective first and second chambers of the distributor, connected to the respective outlets of the first and second pressure sources, in that the slide valve, in the first extreme position, interrupts a link, established for the other positions of the slide valve, between the outlet of the master cylinder and the inlet of the pump, and in that the slide valve, in the second extreme position, interrupts a link, established for the other positions of the slide valve, between the outlet of the master cylinder and the first receiver.
According to an advantageous embodiment, the second chamber is partly formed by a bore of the slide valve, in which slides a piston pushed towards the outside of the bore by the pressure prevailing in the latter, and towards the inside by the first force, this piston opening, after a predetermined outward travel from the neutral position, a duct pierced in the slide valve and placing the first and second chambers in communication, which results in a limitation of the output pressure of the pump.
It is moreover convenient to make provision for the slide valve, in the first extreme position, to establish a direct link, interrupted for the other positions of the slide valve, between the outlet of the pump and the second receiver.
This direct link is preferably established by overlapping of a first annular groove forming a radial extension of the bore and of a second annular groove hollowed out in the slide valve, and the first groove can serve to connect the outlet of the pump permanently to the second chamber.
DESCRIPTION OF THE DRAWING
The invention will now be described by way of example with reference to the single FIGURE which shows diagrammatically a de
REFERENCES:
patent: 4523792 (1985-06-01), Belart et al.
patent: 4700991 (1987-10-01), Nishimura et al.
patent: 4824181 (1989-04-01), Tomala
patent: 4842344 (1989-06-01), Kuwana et al.
patent: 4852952 (1989-08-01), Kervagoret
Bendix Europe Services Techniques
McCormick Jr. Leo H.
Muratori Alfred
Oberleitner Robert J.
Palguta Larry
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