Dual type hydraulic braking system for a vehicle

Details Dual type hydraulic braking system for a vehicle Dual type hydraulic braking system for a vehicle

1980-01-23

1981-11-24

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

188349, B60T 1300

Patent

active

043020569

ABSTRACT:
A hydraulic braking system for a vehicle having independent dual braking circuits delivers the hydraulic pressure produced in a master cylinder to each wheel cylinder mounted on the front and rear wheels. A pressure control valve is provided with a portion similarly constructed to the ordinary proportioning valve. A first piston disposed in this portion for the hydraulic pressure control operation confronts a second piston, which is with a spring constantly biased theretoward and provided with a small-diametered portion and a large-diametered portion. The second piston is placed such that the small-diametered portion thereof confronts the first piston in one air chamber and the large-diametered portion thereof is extended into another air chamber, an end surface of which large-diametered portion on the side of the small-diametered portion being affected by the hydraulic pressure from the other or opposite circuit from one circuit wherein the pressure control valve controls the hydraulic pressure.

REFERENCES:
patent: 3467440 (1969-09-01), Strien
patent: 3627385 (1971-12-01), Stokes
patent: 3650569 (1972-03-01), Kawabe et al.
patent: 3804468 (1974-04-01), Ishikawa et al.
patent: 3969000 (1976-07-01), Ohta et al.
patent: 4070067 (1978-01-01), Katoh et al.

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