Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1985-09-09
1987-02-17
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 7, B60T 802
Patent
active
046434917
ABSTRACT:
In a fluid-pressure operated anti-skid braking system operation of a brake-applying relay valve is controlled by control pressure in an application chamber. A memory chamber is charged on initial brake application with pressure from supply passage connected to a brake actuator through one-way valve and an orifice permits pressure in the memory chamber to decay when the pressure in the supply passage reduces. This reduces the effective volume of air required for initial operation of the relay valve thereby increasing its response time. Re-application of the brake following a skid is controlled by closure of a latch valve which permits only a restricted flow of control pressure into the application chamber. This is sufficient to re-apply the brakes rapidly in a first stage until the pressure in the application chamber becomes equal to that of the decayed pressure in the memory chamber, whereafter brake re-application continues at a slower rate since the restricted flow of control pressure has also to increase the pressure in the memory chamber.
REFERENCES:
patent: 3907379 (1975-09-01), Lawson
patent: 4175795 (1979-11-01), Mortimer et al.
patent: 4210370 (1980-07-01), Mortimer
Carswell Edwin R.
McCann Denis J.
Lucas Industries Public Limited Company
Reger Duane A.
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