Electro-hydraulic actuation system

Details Electro-hydraulic actuation system Electro-hydraulic actuation system

2006-05-16

2006-05-16

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

C091S380000

Reexamination Certificate

active

07043907

ABSTRACT:
An electrohydraulic actuation system in which the quantity of fluid being fed to hydraulic actuators under higher load pressure among those of a plurality of electrohydraulic actuators can be prevented from becoming deficient. In the electrohydraulic actuation system (100), a selection valve (141), a two-position valve (142), a spring (143) and a hydraulic cylinder (144) for altering delivery alter delivery of the working oil of a variable delivery hydraulic pump (111) based on the maximum pressure of the working oil being fed to hydraulic motors (122, 132) and the delivery pressure of working pump (111), and pressure gauges (145, 146, 147, 148, 149) and a computer (not shown) alter the rotatim speeds of motors (123, 133) at a substantially same rate for them.

REFERENCES:
patent: 3457836 (1969-07-01), Henderson
patent: 4031811 (1977-06-01), Inaba et al.
patent: 4901627 (1990-02-01), Schulze
patent: 6334308 (2002-01-01), Sato et al.
patent: 6438952 (2002-08-01), Nozawa et al.
patent: 6439101 (2002-08-01), Kodama et al.
patent: 6772671 (2004-08-01), Asano et al.

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