Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1995-09-14
1997-06-24
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
1376275, 303 842, B60T 836, F16K 3106
Patent
active
056412118
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a pressure control valve, especially an electrically energizable multiway valve for slip-controlled hydraulic brake systems. More specifically, the present invention is directed to a pressure control valve for selectively connecting a main cylinder to a wheel brake and for selectively connecting a wheel brake to a pressure medium collector.
BACKGROUND OF THE INVENTION
German patent DE 29 09 504 C2 discloses a pressure control valve, in which the valve lifter is designed as a slide valve for pressure control in order to establish a pressurized medium communication between a first pressurized medium connection and a second pressurized medium connection in a first switching position, and to sever the connection in a second switching position of the slide valve. In a third switching position of the slide valve, the valve lifter opens a ball check valve, as a result of which an additional pressurized medium connection from the second pressurized medium connection is opened.
However, the pressure control valve has the disadvantage that the slide valve requires a high accuracy of fit to control manufacturing or temperature dependent leakage flows. In addition, no measure is provided to ensure the pressure reduction in the connected line system in the case of jamming of the slide valve in the closed position.
SUMMARY OF THE INVENTION
The present invention is directed to improving a pressure control valve of the above-described type such that a reliable operating pressure control and a compact, miniaturized design are guaranteed with simple means.
The pressure control valve according to the present invention includes a valve slide member arranged in the valve housing which is displaceable in relation to the valve lifter and can be brought into contact with a valve seat arranged in the valve housing. In this way, a first pressurized medium connection is severed from a second pressurized medium connection in the closed position of the additional valve-closing member designed as a seat valve.
More specifically, the pressure control valve of the present invention includes a valve housing defining a first pressurized medium connection leading to the main cylinder, a second pressurized medium connection leading to the wheel brake, and a third pressurized medium connection leading to said pressure medium collector. A first valve includes a first valve closing member and a first valve seat disposed in the valve housing between the second and third pressurized medium connections. A second valve includes a second valve closing member and a second valve seat disposed in the valve housing between the first and second pressurized medium connections. The is second valve closing member is disposed in the valve housing, is axially displaceable relative to a valve lifter, and is axially movable along the valve housing.
The valve lifter of the present invention is axially movable along the valve housing to first, second and third switching positions. At the first switching position, the first valve closing member is urged against the first valve seat to close the first valve and the second valve is open. At the second switching position, the first valve is closed and the second valve closing member is in abutment with the second valve seat to close the second valve. At the third switching position, the valve lifter axially displaces the first valve closing member from the first valve seat to open the first valve and the second valve is closed.
The features and advantages of the present invention will be explained in detail below on the basis of an exemplary embodiment.
BRIEF DESCRIPTION OF THE DRAWING
The figure shows an enlarged longitudinal section of a pressure control valve according to the present invention and portions of a brake circuit with which the pressure control valve may be used.
DETAILED DESCRIPTION OF THE INVENTION
The pressure control valve shown in the figure has a valve housing 1 having a cartridge design (for example, a wedged cartridge, screw
REFERENCES:
patent: 3921666 (1975-11-01), Leiber
patent: 4275758 (1981-06-01), Masuda
patent: 4452267 (1984-06-01), Ott et al.
patent: 4860794 (1989-08-01), Parrott et al.
patent: 4938545 (1990-07-01), Shuey et al.
patent: 5191827 (1993-03-01), Kervagoret
patent: 5290096 (1994-03-01), Beck et al.
patent: 5332304 (1994-07-01), Maas
patent: 5410943 (1995-05-01), Kervagoret
European Search Report dated Feb. 9, 1995.
German Search Report dated Oct. 20, 1994.
English-language translation of Form PCT/ISA/210.
English-language translation of Abstracts for foreign patent documents asterisked above (from Derwent World Pat.).
Feigel Hans-Jorg
Neumann Ulrich
Schiel Lothar
Butler Douglas C.
ITT Automotive Europe GmbH
Lewis J. Gordon
Twomey Thomas N.
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