Variable displacement pump with adjustment responsive to drive motor speed
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United States of America Patent
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Aug 8, 1995
Grant Date -
N/A
app pub date -
Aug 31, 1993
filing date -
Aug 31, 1992
priority date (Note) -
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Abstract
A control device for an actuator adapted to control a discharge pressure of a variable discharge pump by means of a regulator and capable of ensuring sufficient flow control range of change-over valves with respect to a spool stroke even when the number of rotations of an engine for driving the variable discharge pump is reduced to decrease a discharge rate of fluid from the variable discharge pump. Elastic force of a spring of a valve constituting the regulator is adjusted by means of a cylinder associated with a throttle lever for controlling the engine. Also, a control valve is arranged so as to be associated with the throttle lever, so that a pressure on a downstream side of the variable discharge pump is increased to change over the valve.
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