Pump-less hydraulic brake system for automobiles

Details Pump-less hydraulic brake system for automobiles Pump-less hydraulic brake system for automobiles

1982-02-25

1983-12-06

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 6R, 303 22R, 303119, B60T 826, B60T 802

Patent

active

044189664

ABSTRACT:
A pump-less hydraulic brake system has a pair of independent brake lines, each connected to diagonally opposed front and rear wheel brakes, and a control valve mechanism disposed in each brake line. Each control valve mechanism has an electrically connectable inlet valve and outlet valve, actuatable to one of three combinations: (1) in which brake line pressure is determined by the brake pedal-actuated master cylinder; (2) in which the braking pressure in the respective brake line drops, and (3) in which the braking pressure remains steady. A pair of rear brake inlet valves are also provided, and the valves are controlled as a function of the relative rpm or changes in deceleration of the vehicle wheels. The rear brake inlet valves are also independently controlled, to limit maximum braking pressure to the rear wheel brake, as a function of rear axle weight. No more than one vehicle wheel locks at a give time, and vehicle stability and maneuverability, in combination with relatively high braking pressures, are assured.

REFERENCES:
patent: 3550966 (1970-12-01), Leiber
patent: 3576350 (1971-04-01), Larsen
patent: 3832012 (1974-08-01), Bourgoin
patent: 3948568 (1976-04-01), Leiber
patent: 3964794 (1976-06-01), Scholz
patent: 3980346 (1976-09-01), Leiber
patent: 4022514 (1977-05-01), Kondo et al.
patent: 4269456 (1981-05-01), Kondo et al.

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