MULTI-CHANNEL SERVO UNIT Russian patent published in 2006 - IPC B64C13/36 

FIELD: aeronautical engineering.

SUBSTANCE: each sub-channel of proposed servo unit is provided with electrohydraulic valve for cutting-in pressure, electrohydraulic booster, actuating hydraulic cylinder whose piston is rigidly connected with pistons of actuating hydraulic cylinders of other sub-channels and its cavities are hydraulically connected with cross-feed valve and unit for monitoring and disconnecting defective sub-channel; each sub-channel is also provided with over-power valve and feedback sensor. Over-power valve is made in form of hydraulic cylinder with piston and double-sided spring-loaded rod whose cavities are hydraulically connected with cavities of actuating cylinder. Hydraulic cylinder is provided with ports forming slots together with flats of piston in its extreme positions; these slots connect the cavities of hydraulic cylinder. Mounted on hydraulic cylinder body is microswitch engageable with hydraulic cylinder rod; it is used for closing the electric circuit of pressure cut-in valve.

EFFECT: enhanced reliability.

1 dwg