| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic drive device for a construction machine capable of reducing energy loss when simultaneously driving a plurality of hydraulic actuators by allocating discharge oil from a hydraulic pump thereto. <P>SOLUTION: A controller 100 switches directional control valves 24 and 25 based on command signals from operation lever devices 51 and 52. The directional control valves 24 and 25 are to switch flow directions of pressured oil from a hydraulic pump 23 to hydraulic cylinders 21 and 22, and do not function as variable throttles. Flow rates of the pressured oil supplied from the hydraulic pump 23 respectively to the hydraulic cylinders 21 and 22 are regulated through controlling rotation speeds of speed control hydraulic motors 63 and 64 of generators 61 and 62 by inverters 67 and 68 as well as generators 65 and 66 while generating electricity by the generators 65 and 66. <P>COPYRIGHT: (C)2012,JPO&INPIT |
