Brake oil pressure controlling valve device for vehicle use

Details Brake oil pressure controlling valve device for vehicle use Brake oil pressure controlling valve device for vehicle use

1979-09-20

1981-07-21

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

303 24A, 303 24F, B60T 814

Patent

active

042794471

ABSTRACT:
Arranged in parallel with a main control valve, which is principally of the conventional structure including a spherical weighted valve element operable under inertial force, is an auxiliary control valve, that includes a differential piston type valve element normally held in valve-opening position under a spring bias and is operable in response to the oil pressure in the rear wheel brakes rising above a predetermined level to close or to reduce the oil pressure being transmitted therefrom to the rear wheel brakes. With continued rise of the output oil pressure of the brake master cylinder, the valve element is moved away from and close to the valve seat in a repeated fashion. With the dual arrangement of main and auxiliary control valves, there is no impairment of the brake performance such as encountered previously with the conventional valve device, in spite of any premature closing of the main control valve as may occur in brake application during vehicle travel down a steep slope or in sudden brake application.

REFERENCES:
patent: 3888546 (1975-06-01), Stordahl, Jr.
patent: 4072363 (1978-02-01), Tomoyuki
patent: 4181370 (1980-01-01), Noeami et al.
patent: 4199197 (1980-04-01), Maehara

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