HYDRAURIC CIRCUIT OF CONSTRUCTION MACHINERY WITH RECYCLING ENERGY

摘要

The present invention relates to a working machine driving circuit of construction machinery, including a first working device generating potential energy; a second working machine generating inertia kinetic energy; an accumulator (70) fed by the working oil drained from the first working device or the working oil drained from the second working device and storing the potential energy or the inertia kinetic energy as the renewable energy to supply the stored renewable energy to a hydraulic motor (40); an operating spool (60) controlling the working oil drained from the first or second working device to inject the working oil to the accumulator (70); and a hydraulic motor valve (50) provided at the front end of the hydraulic motor (40) to control the working oil discharged from the accumulator (70).