ELECTROHYDRAULIC TWO-CHANNEL SERVO DRIVE Russian patent published in 2009 - IPC F15B9/03 

FIELD: engines and pumps.

SUBSTANCE: electrohydraulic two-channel servo drive relates to aircraft engineering, particularly to electrohydraulic drives, and can be used in onboard radars. Drive hydraulic circuit allows moving output link into neutral position with the help of hydraulic motor followed by mechanical locking to be performed after de-energising electrohydraulic valves. Note here that output link speed decreases as it approached neutral position. With pressure decrease in feed channel exceeding two times, but with electrohydraulic valve actuated, output link also moves into neutral position with subsequent mechanical locking. Thus, drive doubles its function, i.e. moves output link into neutral position and locks it in case feed channel pressure drops.

EFFECT: reliable locking of output link with no extra appliances.

3 cl, 4 dwg