Hydraulic energy recovering/regenerating apparatus

Abstract

Return pressure oil from a pressure oil actuator is supplied to a hydraulic pump/motor as recovering means through a supplying circuit. The hydraulic pump/motor serves as a motor, and a hydraulic pump/motor as regenerating means which is mechanically connected to the first-mentioned hydraulic pump/motor is allowed to serve as a pump. The pressure oil discharged from the second-mentioned hydraulic pump/motor is supplied to a hydraulic pump/motor as driving means and can be stored in the accumulator. The hydraulic pump/motor as the driving means is driven by the pressure oil discharged by the second-mentioned hydraulic pump/motor and the pressure oil stored in the accumulator. With this arrangement, it is possible to recover the energy of the return pressure oil from the pressure oil actuator and to regenerate the recovered energy to be driving energy in the driving means.

Dependencies are inferred from the claim text.