Vehicle brake valve with an emergency piston

Details Vehicle brake valve with an emergency piston Vehicle brake valve with an emergency piston

1981-04-24

1983-09-20

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

60551, 60563, 60591, 303 52, 303114, 303 6R, B60T 802, B60T 1502

Patent

active

044051832

ABSTRACT:
A brake valve useable in conjunction with a vehicle braking system monitored by an anti-locking device and operable by a brake pedal through a trailing spring sometimes also called a simulating spring. The brake valve is provided with a control slide valve longitudinally displaceable by the trailing spring. The slide valve regulates a metered feed of the pressure medium conducted from a pressure source to the wheel brake cylinders. The pressure medium is relieveable at the wheel brake cylinders by anti-lock valves. The slide valve includes two control slide valves of which is associated with a pressure reservoir. One control slide valve cooperates with an emergency piston providing free through-flow during normal operation of the braking system. The emergency piston, upon a failure of the pressure medium source, after an emptying of the pressure reservoirs, is operable mechanically by the brake pedal after a spring-loaded ball valve has been closed at the emergency piston.

REFERENCES:
patent: 3918765 (1975-11-01), Hayashida
patent: 3979153 (1976-09-01), Ingram et al.
patent: 4197710 (1980-04-01), Leiber
patent: 4286826 (1981-09-01), Leiber

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