GAS-HYDRAULIC STEERING DRIVE Russian patent published in 1998 - IPC

FIELD: mechanical engineering. SUBSTANCE: gas-hydraulic steering drive has solid-fuel gas generator, valve designed for maintaining constant gas pressure, displacer, electrohydraulic power amplifier connected by hydraulic lines with spaces of hydraulic cylinder, delivery and drain main lines. Constant pressure reducing valve is installed before electrodynamic power amplifier on delivery main line. Spring space of this valve is connected through distributor with control spaces with spaces of hydraulic cylinder and drain main line by hydraulic lines. Distributor is made in form of spool spring-loaded at two sides and installed in housing with four bores whose control spaces are connected by hydraulic lines with spaces of hydraulic cylinder. Distributing lands of spool in middle position overlap two bores connected with spring space of reducing valve. Interland space communicates with bore connected with spring space of reducing valve and with bore connected with drain main line. EFFECT: reduced mass and overall dimensions of drive, reduced nonproductive flow rate of working liquid. 2 cl, 1 dwg