Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1999-06-25
2000-10-24
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 10, B60T 840
Patent
active
061355798
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hydraulic automotive vehicle brake system with wheel slip control, in particular for driving dynamics control, according to the preamble of patent claim 1.
BACKGROUND OF THE INVENTION
German patent application No. 40 32 797 discloses a hydraulic automotive vehicle brake system with wheel slip control which has a pump and pressure modulation valves in the brake line to control the wheel braking pressure. The pump piston is directly acted upon by the pressure of the braking pressure generator so that the full pressure of the braking pressure generator is applied to the sealing of the pump piston. In defined cases of application, especially for operation of the pump for driving dynamics control purposes, particularly high demands are placed on the above-mentioned sealing of the pump piston in order to ensure in any case a reliable sealing of the crank chamber which is usually subjected to atmospheric pressure.
For automotive vehicle brake systems equipped with a driving dynamics control system, it is preferred to use a type of pump as disclosed in German patent application No. 32 36 536. This type of pump is characterized by a central suction channel arrangement in the pump piston. Therefore, considerable requirements are imposed on the sealing of the pump piston in relation to the eccentric chamber with a pump of this type.
An object of the present invention is to improve upon a hydraulic automotive vehicle brake system of the above-mentioned type to such effect that leakage flow via the pump piston in the direction of the eccentric chamber is prevented by least possible efforts in terms of structure and function.
According to the present invention, this object is achieved by the features characterizing patent claim 1.
Further features and advantages of the present invention can be seen in the subclaims which refer to features related to structure and circuit technique for the configuration of restrictors.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a schematic of the hydraulic system of the present invention. The essence of the present invention will be explained in the following making reference to an embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The only FIG. 1 shows the basic hydraulic circuit configuration of a hydraulic automotive vehicle brake system with wheel slip control which is appropriate for driving dynamics control in a partial view for a wheel brake circuit. Further, the drawing shows a partial cross-sectional view of the construction of a pump 2 as referred to hereinabove with respect to the state of art disclosed in German patent application No. 32 36 536. Pump 2, in the illustration chosen, performs the function of a precharging pump succeeded by a return pump 2' in order to conduct the pressure fluid volume that is supplied by the wheel brake 6, by way of a damping device 7, to the brake circuit and, thus, to brake line 8 which normally connects the braking pressure generator 1 to the wheel brake 6.
Per se known pressure modulation valves 9, 10 are used to control the wheel braking pressure. In the present embodiment, the valves are configured as an electromagnetically operable two-way/two-position inlet valve, which is open in its basic position and, downstream thereof, as an electromagnetically operable two-way/two-position outlet valve which is closed in its basic position.
Following the pressure modulation valve 10 which acts as an outlet valve is a low-pressure accumulator 11 which, in the direction of the suction side of the pump 2, is succeeded by a non-return valve 12 that is usually under a pilot pressure.
In addition to the features of the brake system which are known in the art and herewith are mentioned again, the suction conduit of the pump 2 from the pressure modulation valve 10 is followed by another suction conduit, termed as bypass line 4, which includes a diaphragm valve 3' that interrupts in its basic position the connection between the braking pressure generator 1 and the suction port of the pu
REFERENCES:
patent: 5152589 (1992-10-01), Ocvirk
patent: 5302011 (1994-04-01), Volz et al.
patent: 5511864 (1996-04-01), Reinartz et al.
patent: 5722744 (1998-03-01), Kupfer et al.
patent: 6003958 (1999-12-01), Volz et al.
Search Report of the German Patent Office for German Appl. No. 196 38 898.8 .
Continental Teves AG & Co. OHG
Oberleitner Robert J.
Talavera Melanie
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