| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic actuator suitable for a combination with a hydraulic source having a small variation range of supply hydraulic pressure.SOLUTION: A hydraulic actuator 100 for turning a boom 4 around a boom foot pin 4b includes: a boom cylinder 7 driven with hydraulic fluid of predetermined pressure supplied by a hydraulic pump 14; and a hydraulic motor 40. The boom 4 is turned around the boom pin 4b by an actuator torque T2 including a cylinder torque T3 around the boom foot pin 4b generated by the boom cylinder 7 and a motor torque T4 around the boom foot pin 4b generated by the hydraulic motor 40. Further, the motor torque T4 is variable. |
