BACKUP ELECTROHYDRAULIC DRIVE Russian patent published in 2001 - IPC

Abstract RU 2167345 C2

FIELD: servo drives for automatic-control systems. SUBSTANCE: drive has double-chamber hydraulic cylinder and two electrohydraulic control channels incorporating electrohydraulic power amplifiers, electromagnetic closing valves, and cross- feeding damper valves. The latter have working ports. Each cross-feeding damper valve has plunger and two additional ports. Plunger control chamber communicates with outlet of electromagnetic closing valve of other hydraulic system. Additional ports provide communication with hydraulic drain line of drive over hydraulic lines through check valves. They are coupled with working ports and arranged in such pairs in additional collar-to-collar chambers of slide valve of mentioned device. When slide valve is in position corresponding to damping operation of drive, collar-to-collar chambers communicate through working ports of valve with hydraulic cylinder spaces. EFFECT: improved stability of characteristics in damping operation of rod upon long-time failure of two control channels. 1 dwg

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RU 2 167 345 C2

Authors

Bortsov A.A.

Red'Ko P.G.

Trubitsyn V.E.

Sharov G.V.

Dates

2001-05-20—Published

1999-04-21—Filed