Braking device having an automatic fluid pressure regulating fun

Details Braking device having an automatic fluid pressure regulating fun Braking device having an automatic fluid pressure regulating fun

1989-02-08

1990-09-18

Reger, Duane A.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303110, 303119, B60T 864

Patent

active

049573306

ABSTRACT:
A braking device having a high-pressure hydraulic system including a hydraulic pressure source, a wheel-cylinder hydraulic system including a wheel cylinder for applying brake to a vehicle wheel, a low-pressure hydraulic system including a reservoir, a solenoid-operated directional control valve device for fluid communication of the wheel-cylinder hydraulic system selectively with the high-pressure hydraulic system or the low-pressure hydraulic system, an electric control device connected to the directional control valve device to control the wheel cylinder pressure, and a variable flow restrictor device disposed in the high-pressure hydraulic system or the wheel-cylinder hydraulic system, for decreasing a rate of flow of the fluid through the high-pressure or wheel-cylinder hydraulic system, with an increase in a pressure difference between the high-pressure and wheel-cylinder hydraulic systems, and with an increase in a pressure in the wheel-cylinder hydraulic system. The flow restrictor device may consist of two pilot-operated variable flow restrictor valves which may be disposed in the high-pressure and wheel-cylinder hydraulic systems, respectively, or both disposed in one of these two systems.

REFERENCES:
patent: 3572845 (1971-03-01), Johannesen
patent: 3752537 (1973-08-01), Ochiai
patent: 3975061 (1976-08-01), Kondo et al.
patent: 4179166 (1979-12-01), Sharp et al.
patent: 4715666 (1987-12-01), Farr
patent: 4822112 (1989-04-01), Reuter et al.
Publication No. 0 242 132 of European Patent Application (published on Oct. 21, 1987).

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