HYDRAULIC DRIVE Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: pump is brought in communication with high-pressure air-loaded hydraulic accumulator through check valve. Pump and low-pressure source are connected to respective chambers of hydraulic motor through three-position distributor of working and braking hydraulic lines with safety valve unit mounted between them. Two-position distributor is mounted in braking hydraulic line and its one inlet is connected to braking chamber and one outlet is connected to return hydraulic line. Two-position distributor is four-line device whose second inlet is brought in communication with high-pressure air-loaded hydraulic accumulator through second check valve and second outlet is connected to three-position distributor. Throttle is mounted in return hydraulic line. EFFECT: enhanced efficiency. 1 dwg