Fluid pressure braking system

Details Fluid pressure braking system Fluid pressure braking system

1982-04-16

1984-09-18

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

303 6M, 303 29, 303 30, 303 71, B60T 1322

Patent

active

044720017

ABSTRACT:
Fluid pressure braking system (10) for supplying fluid pressure to actuate the service brake actuators (26) and to supply hold-off pressure to release the spring brake actuators (22) of the trailer portion of a tractor-trailer combination vehicle includes a spring brake relay valve (32) having a delivery port (38) communicated with the spring brake actuators (26), a control port (34) communicated with the trailer supply line or conduit (12), and a supply port (36) communicated with the supply line (12) through a bypass passage (40). Accordingly, hold-off pressure can be supplied directly to the spring brake actuator (26) before the reservoir (44) is fully charged. The reservoir (44) is charged through the supply line (12) and a pressure protection valve (54) which opens to permit charging of the reservoir (44) only when the pressure in the system exceeds a predetermined level.

REFERENCES:
patent: Re30205 (1980-02-01), Carton et al.
patent: 3504946 (1970-04-01), Valentine et al.
patent: 4003605 (1977-01-01), Fannin
patent: 4057297 (1977-11-01), Beck et al.
patent: 4182535 (1980-01-01), Fannin

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