| 摘要 |
PURPOSE:To improve a feeling of steering, by providing an air vent hole in a wall surface of the connection part of a cylinder to a gear chamber, easily discharging air in the gear chamber to the outside via the cylinder and performing stable motion of a piston. CONSTITUTION:A wall part C is provided in a crossing portion of wall parts of a cylinder 2 and housing 39, and an air vent hole 40, connecting the housing 39 and one end chamber B of the cylinder 2, is provided to the wall part C. In this way, air in the housing 39 can be easily discharged to the outside via the hole 40, and stable motion of a piston can be performed, then a feeling of steering can be improved. |
