| 摘要 |
PURPOSE:To reliably operate each actuator, by a method wherein variable capacity type hydraulic pumps are mounted corresponding to their respective hydraulic actuators, and discharge lines of hydraulic pumps are coupled together with a joining line provided with combining opening and closing valves. CONSTITUTION:At least one of variable capacity type hydraulic pumps 20-24 is located corresponding to each of a revolving motor 5 working as each hydraulic actuator for a hydraulic shovel, hydraulic motors 3 and 6 for lateral running, a boom hydraulic cylinder 8, an arm hydraulic cylinder 4, and a bucket hydraulic cylinder 7, the discharge side lines of the variable capacity type hydraulic pumps 20-24 are coupled together with joining lines 52-57 provided with combining opening and closing valves 58-63. Switching valves 47-51 of their respective actuators 3-8, the combining opening and closing valves 58-63, and the hydraulic pumps 19-24 are controlled by a computer 70 of a control panel 69 so that a total value of the input horse powers of the hydraulic pumpa does not exceed the output horse power of a prime mover when a plural number of the hydraulic actuators is simultanoeusly controlled. |
