ELECTRO-HYDRAULIC SERVO DRIVE Russian patent published in 2006 - IPC F15B9/03 

FIELD: aircraft control.

SUBSTANCE: drive comprises housing with passages connected with the hydraulic lines for charging and discharging, two-space hydraulic motor with output member and feedback pickup, cylindrical distributor connected with the linear electric motor, two pressure limiters which are composed of the plunger and spring-loaded valving member that cooperates with it and whose closure surface is in a contact with the space passage of the hydraulic motor, switching valve made of the spring-loaded plunger and spring-load ball that bears on it, and correcting device made of two-chamber cylinder with the piston whose one end is connected with the space of the feedback pickup. The chamber is connected with the spaces of the electric motor. The housing is also provided with a socket that receives the pressure controller that is composed of control magnet with rod that bears on the spring-loaded cylindrical distributor for permitting movement and has two collars and groove between them. The groove is connected to the spring space through the opening. The socket is provided with four distributing throttle bores. The first of the bores is arranged from the side of the control magnet and its pusher . The second bore is connected with the discharging line. The fourth bore is connected with the charging hydraulic line,.

EFFECT: enhanced reliability.

1 cl, 1 dwg