| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary actuator of a structure capable of reducing inside leakage of a pressure medium, and capable of dispensing with a high pressure rotary seal or capable of largely reducing high pressure rotary seals.SOLUTION: An output shaft and arms 15a and 15b are arranged inside a cylinder 12. Circular arc-shaped pistons 14a and 14b rotatably connected to the arms 15a and 15b are displaced by sliding in the peripheral direction of the cylinder 12 on the inside of the cylinder 12. A first pressure chamber 25 on the arm 15a, 15b side and second pressure chambers 26a and 26b on the piston head part 32 side are arranged in the cylinder 12. Third pressure chambers are arranged on both sides of the cylinder 12. The pressure medium is supplied to one of the first and second pressure chambers, and the pressure medium is discharged from the other, and the output shaft 13 rocks in the rotational direction. When supplying the pressure medium to the second pressure chambers 26a and 26b, the pressure medium is also supplied to the third pressure chamber. |
