ENERGY REGENERATION DEVICE AND WORK MACHINE PROVIDED WITH ENERGY REGENERATION DEVICE

摘要

Provided are an energy regeneration device which can regenerate energy of a working fluid discharged from an actuator while controlling a flow rate of the working fluid, and a work machine including the foregoing device. The regeneration device (100) includes a boom cylinder (20), an inertial fluid container (102), an oil tank (110), an accumulator (105), a low-pressure-side opening/closing device (103), and a high-pressure-side opening/closing device (104). A calculation unit (151) calculates an opening area of each of the low-pressure-side opening/closing device (103) and the high-pressure-side opening/closing device (104) in accordance with a desired flow rate of a hydraulic fluid discharged from the boom cylinder (20). A regeneration control unit (153) adjusts an opening area of each of the low-pressure-side opening/closing device (103) and the high-pressure-side opening/closing device (104), and selects alternately the low-pressure-side opening/closing device (103) and the high-pressure-side opening/closing device (104) as a destination with which the inertial fluid container (102) communicates, to supply a discharged hydraulic fluid to an accumulator (105).