Full power hydraulic braking systems for tractor-trailer combinations
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United States of America Patent
Stats
-
Dec 2, 1980
Grant Date -
N/A
app pub date -
Dec 4, 1978
filing date -
Nov 7, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tractor-trailer hydraulic braking system in which the tractor braking circuit and trailer braking circuit are inter-connected by releasable hydraulic couplings including both service and emergency line connections each with its associated return line. The trailer circuit also includes a pressure storage unit or accumulator and a emergency valve operable to apply the trailer brakes in the event of loss of emergency line pressure. To avoid leak down of the accumulator over a period following de-coupling of the trailer an expansion tank or chamber is connected into the trailer circuit so as to receive fluid leaking into the return lines from the accumulator and to retain such fluid until the pump can return it to the accumulator.
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