Control apparatus for a variable displacement pump
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United States of America Patent
Stats
-
Dec 8, 1987
Grant Date -
N/A
app pub date -
Dec 12, 1985
filing date -
Dec 13, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control apparatus for a variable displacement pump includes a variable displacement pump having an inlet port and a discharge port driven by an external engine. A piston assembly is provided for varying the amount of displacement of the pump. The control apparatus further includes a switching valve for switching operational fluid which is to be applied to and operates the piston assembly, an additional pump a control pressure a magnitude of which is proportional to the rotational speed of the external engine, a balance piston for transducing the control pressure from the additional pump into a force and for applying the force to one end of the switching valve. A discharge line is provided connecting the discharge port of the variable displacement pump with an external load, and a pilot line is branched off from the discharge line into the switching valve for applying a pressure in the discharge line to the other end of the switching valve.
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