| 摘要 |
PROBLEM TO BE SOLVED: To provide an oscillation type actuator with a hydraulic valve provided with a pressure medium connection part and two operation connection parts in an axial direction on a common side.SOLUTION: An oscillation type actuator has a shouldered through hole 28 and operation connection parts A, B formed of the through hole. A hollow piston 32 which is balanced in pressure is provided in the through hole 28 movably in an axial direction, and includes an enclosing surface 47 which is fitted in a sealed state to a first external diameter D in a hole section 71 and has a small external diameter D2 at an axial part of the first operation connection part A adjacently to the first external diameter, and an enclosing surface 48 having a small external diameter D1 at the other operation connection part B. Each entrance edge 41 or 42 and each exit edge 42 or 43 extend from both the enclosing surfaces 47, 48, and while two entrance edges 41, 44 face mutually opposite directions, the exit edges 42, 43 face each other. |
