SELF-CONTAINED HYDRAULIC DRIVE Russian patent published in 2003 - IPC

FIELD: mechanical engineering. SUBSTANCE: invention is designed for use in control system of road vehicles, road building machinery, aircraft and rocket building and shipbuilding. Proposed hydraulic drive consists of hydraulic motor units and hydraulic supply source combined through manifold. Electromagnetic cross-over feed valve of pressure line of low-pressure pump in hydraulic motor unit is connected through manifold with suction hydraulic line of low-pressure pump. Pressure transmitter is installed in supply hydraulic line of second stages of electrohydraulic amplifiers. Mechanical lock of piston is installed in gas-hydraulic accumulator in position corresponding to hydraulic liquid filled-up state of pressure hydraulic space. Slot seal in form of bushing is installed on paired pump shaft between crankcases spaces pumps. One end of said bushing engages with shaft through its inner calibrated surface and other end is secured in hole of crankcase space of one of pumps for self-alignment of first end relative to shaft surface. Operating pressure of pressure relief valve of high- pressure pump is lower than pump relief pressure. EFFECT: increased efficiency of heat exchange between component parts of hydraulic drive. 1 dwg