UNIT OF COMBINED HYDRAULIC ACTUATORS Russian patent published in 2019 - IPC B64C27/64 F15B9/09 

FIELD: aircrafts.

SUBSTANCE: invention relates to combined hydraulic control devices for helicopters. Unit of combined hydraulic actuators consists of unit of filters (1, 7, 12), lower and upper control units, unit of hydraulic cylinders (18, 23). Combined hydraulic actuator unit is configured to direct the working fluid under pressure from the filter unit into the groove between the shoulders of the plunger of electro-hydraulic valve (20). When the electro-hydraulic valve is turned off, the flow of the working fluid to electro-hydraulic amplifier (21) is blocked, which leads to the absence of unproductive leakage.

EFFECT: invention provides the possibility of preflight testing in the mechanohydraulic control mode in field conditions from a hand pump and increases the maximum developed effort to release into the required channel of the hydraulic drive without increasing the diameter of the hydraulic cylinder.

1 cl, 1 dwg