Hydraulic pump unloader
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United States of America Patent
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-
Mar 27, 1990
Grant Date -
N/A
app pub date -
Jan 24, 1989
filing date -
Jan 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An unloader device for controlling the output of a hydraulic pump, for example, in a constant pressure-type motor vehicle braking circuit. Delivery to hydraulic accumulators in the circuit is halted by a resilient seal defining an annulus forming part of the inlet fluid flow path to the pump and to which the pump delivery pressure is applied to expand the seal in the sense to close the annulus, by a valve operable when the delivery pressure reaches a predetermined value.
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