Hydraulic braking system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 6, 1981
Grant Date -
N/A
app pub date -
May 31, 1979
filing date -
May 31, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A braking system for a towing vehicle having a trailer brake valve (24) and hydraulically operated brakes (12) and a trailer having hydraulically operated brakes (14). A novel pilot operated control valve (34) directs the output of the trailer brake valve (24) to both the vehicle brakes (12) and the trailer brakes (14). If the line (46) to the trailer brakes (14) should burst, flow to the trailer brakes is substantially throttled off due to the valve spool (62) shifting to substantially block the flow of fluid through port (40) thereby permitting continued operation of the vehicle brakes. The operating pressure ranges of the brakes may be different. Thus, the operating pressure range of the vehicle brakes (12) is the same as pilot line (74) pressure, which is the output pressure of the brake master cylinder (16), while the operating pressure range of the trailer brakes (14) is the same as output pressure of the trailer brake valve (24) in line (44). The trailer brake valve (24) may have an output proportionately different than pilot line pressure (30).
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Cited Art Landscape
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