DOUBLE-ACTING STEPPED HYDRAULIC DRIVE Russian patent published in 2000 - IPC

FIELD: transport engineering; positive displacement hydraulic drives. SUBSTANCE: hydraulic drive has two double-space hydraulic motors with piston and rod spaces communicating through controlled hydraulic distributor with pressure and return lines. At least one hydraulic motor is secured on fixed base for rigid coupling with other hydraulic motor. Unlike spaces of hydraulic motors are connected in pairs by hydraulic coupling to form two united spaces supplied only by two hydraulic lines. Hydraulic motors are installed so that, with hydraulic drive in extreme position, pistons are in opposite phases: piston of one hydraulic motor is fully pushed out, and piston of other hydraulic motors is fully pushed in. With pistons in pushed-out position, united spaces are coupled with pressure line. With piston of one of hydraulic motors in pushed-out position, united space formed by corresponding piston space is connected with pressure line, other united space being connected with return line. EFFECT: reduced number of hydraulic lines connecting hydraulic distributors with consumers, provision of serviceability of hydraulic drive in case of emergency deenergizing. 6 cl, 1 dwg