Electro-pneumatic spring and service brake actuator

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

B - Operations, Transporting

60

T

B60T 13/26 (2006.01) B60T 13/66 (2006.01) B60T 17/08 (2006.01)

Patent

CA 2100684

An electro-pneumatic braking system includes a tandem brake actuator (12) including a service brake actuating section (16) and an emergency/parking spring actuated section (18). Hold-off pressure is communicated to the emergency/parking section through a three-way solenoid valve (54) from a pressure reservoir (42), and communication to the service actuator is controlled by electro-pneumatic modulator (56). Service pressure is taken both from the branch of the conduit communicating with the air reser- voir (42), but also from the hold-off pressure in the emergency/parking reservoir (34). Accordingly, only a single line communi- cates 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.

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