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Title: Fluid pressure braking system with limiting valve for anti-compounding and fail-safe standby valve
Claims: I claim: 1. 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. 2. The invention of claim 1: said parking system including valve mechanism for controlling communication therethrough; said valve mechanism being shiftable between a vehicle operating position and a vehicle parking position, and release valve means responsive solely to shifting of said valve mechanism from said vehicle parking position to said vehicle operating position to communicate fluid pressure to said emergency actuation means until a predetermined pressure level is attained at said service port whereupon said release valve means vents said emergency actuation means. 3. The invention of claim 2: said brake actuator including fluid pressure controlled locking mechanism communicated to a locking port for locking said actuator in a brake-applied condition, said parking system including valve mechanism for controlling communication therethrough, said valve mechanism being shiftable between a vehicle operating position and vehicle parking position and parking valve means responsive to movement of said valve mechanism from said operating position to said parking position to vent the fluid pressure level communicated to said locking port and communicating fluid pressure to said emergency port. 4. 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. 5. The invention of claim 4; and a parking system for controlling said parking means, said parking system including valve mechanism for controlling communication to said parking means, said control port being communicated to said valve mechanism. 6. The invention of claim 5: said brake actuator having an emergency port communicated to said parking system, and fluid pressure controlled locking mechanism including a locking port communicated to said parking system for locking said actuator in a brake-applied position when a parking application is effected, said valve mechanism controlling communication to said locking and emergency ports. 7. The invention of claim 6: said valve mechanism being shiftable between a vehicle operating position and a vehicle parking position, and release valve means responsive solely to shifting of said valve mechanism from said vehicle parking position to said vehicle operating position to communicate fluid pressure to said service port until a predetermined pressure level is attained at said service port whereupon said release valve means vents said service port. 8. The invention of claim 6: said valve mechanism being shiftable between a vehicle operating position and a vehicle parking position, and parking valve means responsive to movement of said valve mechanism from said operating position to said parking position to vent the fluid pressure level communicated to said locking port and communicating fluid pressure to said emergency port. 9. The invention of claim 8; and release valve means responsive to shifting of said valve mechanism from said vehicle parking position to said vehicle operating position to communicate fluid pressure to said service port until a predetermined pressure level is attained at said service port whereupon said release valve means vents said service port. 10. The invention of claim 9: said fluid pressure braking system including a first service braking system communicating said source to said service port and a second service braking system separate from said first service braking system, brake valve means for simultaneously controlling communication through said service braking systems, and 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 said emergency port, 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 thereof. 11. The invention of claim 6: said fluid pressure braking system including a first service braking system communicating said source to said service port and a second service braking system separate from said first service braking system, brake valve means for simultaneously controlling communication through said service braking systems, and 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 said emergency port, 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 port. Other info: Inventors: Fannin, Richard C. (Elyria, OH, US) Application Number: 636384 Filing Date: 1975-11-28 Publication_date: 1977-01-18 Assignee: The Bendix Corporation (South Bend, IN) Primary Class(es): 303/9.76 303/9, 303/13, 303/71 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Blix, Trygve M. Assistant Examiner: Butler, Douglas C. Attorney: Decker; Ken C., Antonis; William N. |
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