| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a hydraulic actuator which can suppress a rise of a temperature of a working fluid which is used for the elongation/contraction of a cylinder device.SOLUTION: A lifting actuator 100 (hydraulic actuator) comprises: a cylinder device 10 which is partitioned to a first chamber Y1 and a second chamber Y2 by a piston 12, elongated by the supply of oil (working fluid) to the first chamber Y1, and contracted by the supply of the oil to the second chamber Y2; a pump main body 25 (pump device) which sends out the oil; an outside tank 81 (tank) which stores the oil; and a changeover device 85 which switches the oil so that the oil is supplied from the pump main body 25 when supplied to the second chamber Y2, and the oil is directly discharged to the outside tank 81 when discharged from the second chamber Y2.</p> |
