| 摘要 |
The present invention relates to a piston orientation control structure in a structure in which a circular piston (14) is inserted in a circular cylinder chamber (13) and a supply port (16) for supplying hydraulic fluid for operating the piston (14) is provided in the cylinder chamber (13). In the piston orientation control structure: a circular partition member (22) is disposed between the piston (14) and the supply port (16); through holes (25) for passing the hydraulic fluid are provided in the partition member (22); multiple through holes (25) are provided on the periphery of the partition member (22); and the farther the through holes are provided from the supply port (16), the larger the cross-sectional area of the opening is set to be. As a result, the present invention makes it possible to limit slanted operation of the piston (14) even in piston devices (11) of a type in which only a single supply port (16) is set on the periphery. |
