Hydraulic actuator circuit with flow-joining control

Details Hydraulic actuator circuit with flow-joining control Hydraulic actuator circuit with flow-joining control

1989-08-31

1991-01-22

Look, Edward K.

Power plants

Pressure fluid source and motor

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

60430, 91 28, F15B 1304

Patent

active

049860720

ABSTRACT:
A hydraulic actuator control circuit capable of increasing the flow rate of the working fluid supplied to hydraulic actuators when the load on the hydraulic actuators increases beyond predetermined values includes a first valve group having a plurality of pilot controlled selector valves connected, respectively, to hydraulic actuators, a second valve group having a plurality of pilot controlled selector valves connected, respectively, to lines connecting the hydraulic actuators to the pilot controlled selector valves of the first valve group, two hydraulic pumps connected, respectively, to the first and second valve groups, and a tank for containing working fluid. A two-port two-position valve and a pilot controlled selector valve for applying a pilot pressure to the pilot chamber of the two-port two-position valve are controlled according to the load on the a logic so that the hydraulic selector valve of the second valve group is connected to the hydraulic actuator in addition to the hydraulic selector valve of the first valve group to increase the flow rate of the working fluid supplied to the hydraulic actuator when the load on the hydraulic actuator exceeds a predetermined value, to operate the hydraulic actuator at an increased operating speed.

REFERENCES:
patent: 4141280 (1979-02-01), Lorimor
patent: 4164119 (1979-08-01), Parquet
patent: 4875337 (1989-10-01), Sugiyama et al.

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