HYDRAULIC DRIVE DIGITAL-TO-ANALOG CONVERTER Russian patent published in 2007 - IPC F15B9/02 F15B11/12 

FIELD: rockets and flying vehicles.

SUBSTANCE: converter is designed for use in drives of actuating members of rockets and other flying vehicles. Proposed converter has case, feedback rod, hydraulic boosters, sleeve with axial hole, chain of floating pistons connected into pairs and provided with cutoff lands and engagement elements. Stop encloses rod of lower order piston of floating pistons chain. Feedback rod interacts with involute generatrix of cam of feedback device installed on output shaft of drive. Cylindrical space with cover is made in case, and feedback rod is provided with cylindrical flange in contact with hydraulic spring made up of minimum two cylindrical pushers installed coaxially relative to feedback rod. Space accommodating the flange is connected with drain main line, and delivery main line is laid to end faces of cylindrical pushers. Adjusting stop is placed between piston of higher order of floating pistons chain and cylindrical flange of feedback rod.

EFFECT: increased speed of response of converter, reduced overall dimensions of case.