Electro-pneumatic spring and service brake actuator

Details Electro-pneumatic spring and service brake actuator Electro-pneumatic spring and service brake actuator

1991-01-29

1992-06-02

Halvosa, George E. A.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

303 71, 188170, B60T 1322

Patent

active

051181657

ABSTRACT:
An electro-pneumatic braking system includes a tandem brake actuator including a service brake actuating section and an emergency/parking spring actuated section. Hold-off pressure is communicated to the emergency/parking section through a three-way solenoid valve from a pressure reservoir, and communication to the service actuator is controlled by an electro-pneumatic modulator. Service pressure is taken both from the branch of the conduit communicating with the air reservoir, and from the hold-off pressure in the emergency/parking reservoir. Accordingly, only a single line communicates fluid pressure from the reservoir to the brake, and service brake response time is improved because the hold-off pressure and the emergency/parking section of the actuator is used as a small reservoir immediately adjacent the service actuator.

REFERENCES:
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patent: 3581627 (1971-06-01), Campaini
patent: 3712181 (1973-01-01), Swander, Jr. et al.
patent: 3796138 (1974-03-01), Doyle et al.
patent: 3813994 (1974-06-01), Swander, Jr. et al.
patent: 3947072 (1976-03-01), Plantan
patent: 4003606 (1977-01-01), Plantan
patent: 4018485 (1977-04-01), Fannin
patent: 4697852 (1987-10-01), Scholz
patent: 5024490 (1991-06-01), Wang

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