| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic drive working machine capable of reducing noises and exhaust gas while speeding up an operation speed the a working machine.SOLUTION: A hydraulic drive working machine has an engine system hydraulic pump 11 driven by an engine 22, an electric motor system hydraulic pump 12 driven by an electric motor 31, a hydraulic actuator 14 to which operation oil can be supplied from the engine system hydraulic pump 11 and the electric motor system hydraulic pump 12, and operation means 13a operating the hydraulic actuator 14, and a control means 40 contouring a rotational frequency of the engine 22 and a rotational frequency of the electric motor 31 according to an operation quantity of the operation means 13a. The discharging flowing quantity of the engine system hydraulic pump 11 can be suppressed while speeding up an operation speed of the working machine and thereby the noises and exhaust gas can be reduced because the operation oil is supplied to the hydraulic actuator 14 from the engine system hydraulic pump 11 and the electric motor system hydraulic pump 12. |
