| 摘要 |
According to one embodiment of the present invention, a cylinder tube comprises: a first hollow tube having a hydraulic line penetrated in the thickness direction, a first horizontal line penetrated in the longitudinal direction and dislocated from the hydraulic line, and an installation groove recessed from an outer surface; and a second hollow tube inserted into the installation groove and having a coolant supply line which is connected to the first horizontal line and allows a coolant supplied from the outside to flow therein. |
