Hydraulic device

Details Hydraulic device Hydraulic device

1996-12-24

1999-08-17

Richter, Sheldon J.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60426, 91446, F15B 1306

Patent

active

059376457

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 pump flow control valve capable of controlling the pump delivery. Each 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: 4617854 (1986-10-01), Kropp
patent: 4739617 (1988-04-01), Kreth et al.
patent: 5203678 (1993-04-01), Sugiyama et al.
patent: 5271227 (1993-12-01), Akiyama et al.
patent: 5386697 (1995-02-01), Claudinon et al.
patent: 5394697 (1995-03-01), Hirata

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