| 摘要 |
This actuator unit is equipped with: a rod-side chamber and a piston-side chamber delimited by a piston inside a cylinder; a tank; a direction-control valve which makes it possible to selectively supply a working fluid discharged from a pump to the rod-side chamber and to the piston-side chamber; a first variable relief valve which is provided in a first control channel for connecting the rod-side chamber and the tank, allows the flow of the working fluid heading to the tank from the rod-side chamber by opening when the pressure from the rod-side chamber reaches a valve-opening pressure, and is capable of varying the valve-opening pressure; a second variable relief valve which is provided in a second control channel for connecting the piston-side chamber and the tank, allows the flow of the working fluid heading to the tank from the piston-side chamber by opening when the pressure from the piston-side chamber reaches a valve-opening pressure, and is capable of varying the valve-opening pressure; and a center channel for connecting the tank to the interior of the cylinder. |
