FIELD: mechanical engineering. SUBSTANCE: hydraulic system has reverse combined pump- turbine units 11 and 12 of variable working volume coupled with common driving engine 22 and hydraulic cylinder 1 with under-piston space 2 and space 3 without piston coupled with spaces 9 and 10 of unit 11 through dispenser 6 over the closed-loop. Spaces 13,15 of unit 12 are connected with tank 14 and space 9 of unit 11 respectively. Systems 19 and 20 for control of volumes of units 11 and 12 are interconnected kinematically. Unit 12 coordinates operation conditions of the system and recuperation of energy when hydraulic motor is additionally loaded. EFFECT: enhanced efficiency. 1 dwg
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