Fail safe bypass for a skid control system

Details Fail safe bypass for a skid control system Fail safe bypass for a skid control system

1975-11-18

1977-12-20

Halvosa, George E. A.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

1375992, B60T 810

Patent

active

040637859

ABSTRACT:
Two embodiments of skid control systems for preventing the skidding of a wheel of a vehicle, each having a fluid pressure actuated brake and a hydraulic modulator that is operated by a vacuum motor in response to a predetermined skid signal to reduce the pressure on the wheel brake to prevent skidding. A bypass valve is incorporated for providing a direct source of actuating fluid to the wheel brake in the event of failure of the vacuum actuator to maintain the modulator in a normal braking position due to failure of the vacuum actuator. In each embodiment the hydraulic modulator includes a skid control valve movable between an open, normal braking position and a closed, skid control position in response to the predetermined skid signal. In one embodiment of the invention, the skid control valve is supported within the structure of the bypass valve to provide a compact assembly.

REFERENCES:
patent: 3309852 (1967-03-01), Allen
patent: 3414336 (1968-12-01), Atken et al.
patent: 3524685 (1970-08-01), Harned et al.
patent: 3602554 (1971-08-01), Ichimura et al.
patent: 3610701 (1971-10-01), Riordan
patent: 3672731 (1972-06-01), Koivunen
patent: 3684328 (1972-08-01), Koivunen
patent: 3782786 (1974-01-01), Matsumura

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