| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a non-reaction area, where the motor rotating speed is not change to the operation of an operating means by changing the opening of a control valve and the capacities of a hydraulic pump and a hydraulic motor continuously from the operation start of an operating means to the maximum operating positions, respectively. SOLUTION: A controller 5 controls three elements of the valve opening of a control valve 3, the pump capacity of a hydraulic pump 2, the motor capacity of a hydraulic motor 1 so as to begin to change at once from the minimum value of a speed command signal according to the lever operating quantity of an operation part 4 to the maximum value and continue the change to the maximum operating position of the operation part 4. According to this, the motor rotation speed is linearly changed continuously from 0 to the maximum value in proportion to the speed command signal. Thus, the non-reaction area where the motor rotating speed is not changed in compliance with to the change of the speed command signal by the gap between the change end point of the pump capacity and the change start point of the motor capacity can be eliminated.
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