Abstract: The invention relates to engineering hydraulics, in particular to hydraulic drives with closed working fluid circulation. The hydraulic drive contains a hydraulic accumulator connected with a drive motor. The hydraulic pump is connected through pressure and drainage pipelines to a hydraulic distributor connected through pressure-drainage pipelines to a double-acting hydraulic motor with piston and rods. Between the pressure and drainage pipelines is connected a check valve. The hydraulic flow distributor, is made crane-type, three-position, six-way, consisting of a cylindrical body closed on one side with a cover, the other side with a pressure washer, on the shaft is mounted a control lever. In the cylindrical body and the shaft are made in two levels create alternately pressure and drainage flow passages. The hydraulic drive has a wide range of manufacturing and operating capabilities, large capacity and speed, positional accuracy of the actuators, compactness, low weight and high reliability.

Abstract: The invention relates to engineering hydraulics, in particular to hydraulic drives with closed working fluid circulation system used, for example, in mechanical engineering, shipbuilding, machine-tool and aircraft building. The hydraulic drive with closed working fluid circulation system contains a hydraulic accumulator (1) connected through a pipeline with an unregulated single-rotating hydraulic pump (2) with a drive motor. The hydraulic pump (2) is connected through pressure (4) and drainage (5) pipelines to a hydraulic distributor (6) with a control lever (7), at the same time the hydraulic distributor (6) is connected through pressure-drainage pipelines (8, 9) to the chambers of a double-acting hydraulic motor (12) with a piston (13) and rods(14, 15). Between the pressure and drainage pipelines is connected a check valve (16).