Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1998-10-19
2000-07-04
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60426, 91446, 91517, F15B 1105
Patent
active
06082106&
ABSTRACT:
A hydraulic device comprises a variable displacement pump, a plurality of hydraulic actuators, a plurality of directional valves capable of controlling the delivery oil flowing into each of the actuators, a plurality of pressure compensation valves which compensate the pressures of respective directional valves, and a delivery oil flow rate varying means capable of controlling the pump delivery. At least one of the pressure compensation valves decreases its output flow to a particular actuator according to an increase in the loaded pressure of the particular actuator. With this arrangement, if the loaded pressure of the particular actuator suddenly changes, the loaded pressure attenuates to ensure stable operation of the hydraulic device. Further, the stable operation is fee of hunting for both low-load actuators and high load actuators, regardless of an independent operation or a compound operation.
REFERENCES:
patent: 4020867 (1977-05-01), Sumiyoshi
patent: 4275643 (1981-06-01), Knowles
patent: 5271227 (1993-12-01), Akiyama et al.
patent: 5347811 (1994-09-01), Hasegawa et al.
patent: 5622206 (1997-04-01), Takeuchi et al.
patent: 5738134 (1998-04-01), Ishizaki et al.
Frank Robert J.
Kelemen Gabor J.
Lopez F. Daniel
Nachi-Fujikoshi Corp.
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