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AssigneeThe Bendix Corporation
InventorRichard C. Fannin
Estimating the term…
A fluid pressure braking system for a vehicle having brake actuators which may be mechanically held in the brake-applied position when the vehicle is parked and which may be actuated from either service or emergency actuating systems, is provided with a fluid communication limiting valve which limits fluid communication through the service actuating system to the brake actuators when the actuators have been actuated by the emergency system, thereby providing an "anti-compounding" capability so that the brake actuators cannot be actuated by the combined full capacities of both actuating systems. The system further includes a standby valve which is responsive to a normal brake application to communicate fluid pressure to the actuators through the emergency system when the failure of the primary fluid pressure system prevents communication to the actuators through the service system.
In a vehicle fluid pressure braking system having first and second service braking systems and a parking braking system, a first set of brake actuators connected in said first service braking system and a second set of actuators connected in said second service system, brake valve means for communicating fluid pressure in said first and second service braking systems when a brake actuation is effected, said first set of brake actuators including emergency actuation means for actuating said first set of brake actuators upon failure of said first service braking system, said emergency actuation means including emergency valve means having a control port communicated in said first service braking system, an inlet port communicated through said brake valve means to said second service braking system so that upon actuation of said brake valve means fluid communication to said inlet port from said second service braking system is permitted, and an outlet port for communicating fluid pressure to actuate said emergency actuation means, said emergency valve means being responsive to failure of the fluid pressure level at the control port to permit communication between the inlet and outlet ports.
In a vehicle fluid pressure braking system, a brake actuator having a service port connected to a fluid pressure source when a service brake application is effected and fluid pressure responsive parking means for holding the actuator in a brake-applied condition when a parking application is effected, and limiting valve means limiting fluid pressure communication to said service port upon actuation of said parking means, said limiting valve means being responsive to fluid pressure communication to said parking means to permit substantially uninhibited fluid communication to said service port when the parking means is released and to limit communication to said service port when the parking means is actuated, said limiting valve means including an inlet port communicated to said fluid pressure source, an outlet port controlling communication to said service port, and a control port, said limiting valve means being responsive to the fluid pressure level at said control port to establish a fluid pressure level at the outlet port less than the fluid pressure level at the inlet port.
Dependencies are inferred from the claim text.