| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic transmission capable of efficiently regenerating energy while controlling a speed in a load reducing direction.SOLUTION: A hydraulic transmission comprises: a hydraulic actuator 10; a hydraulic pump 20, a closed circuit 4 being constituted by the hydraulic pump 20 and the hydraulic actuator 10; a drive source 26 thereof; a charge circuit 30; an accumulator 42 receiving a hydraulic fluid discharged from the hydraulic actuator 10 at a time of reduction driving; an accumulator flow regulator 44 capable of changing a flow rate of the hydraulic fluid introduced from the closed circuit 4 into the accumulator 42; a regeneration actuator 46 converting energy of the hydraulic fluid accumulated in the accumulator 42 to power; a regeneration selector valve 48 interposed between the accumulator 42 and the regeneration actuator 46; a pump control unit limiting a pump discharge flow rate at the time of reduction driving; and a speed control unit manipulating the accumulator flow regulator 44 so as to make an operation speed of the hydraulic actuator 10 closer to a target speed at the time of reduction driving.SELECTED DRAWING: Figure 1 |
