Dual type hydraulic circuit in a vehicle brake system

Details Dual type hydraulic circuit in a vehicle brake system Dual type hydraulic circuit in a vehicle brake system

1980-12-31

1983-02-01

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Load control

Responsive to fluid pressure spring

303 6C, 188106P, B60T 818

Patent

active

043712150

ABSTRACT:
A dual hydraulic circuit in a vehicle brake system having two mutually independent piping systems wherein a tandem master cylinder is in communication with wheel cylinders provided on right and left rear wheels, respectively, and a valve device for controlling pressure levels of brake fluid in the two hydraulic piping systems. The valve device comprises a housing, and two valve pistons received therein each of which controls the hydraulic braking pressure to be exerted to the corresponding rear wheel cylinder. The two valve pistons are operated together by a resilient force of one single spring acting thereon whereby, in the event of a hydraulic pressure failure in either one of the two piping systems, the valve piston in the still operative system is unable to initiate its pressure control operation until the same piston alone overcomes the resilient force of the spring.

REFERENCES:
patent: 3804468 (1974-04-01), Ishikawa et al.
patent: 4028658 (1977-06-01), Nakamura et al.
patent: 4053186 (1977-10-01), Jakobi
patent: 4299426 (1981-11-01), Hales et al.

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