| 摘要 |
<p>A piston of a fluid pressure cylinder is provided with a seal ring which is fitted into a seal ring holding groove; piston rings each of which has a cut-off section, and which are fitted into piston ring holding grooves in a piston; and backup rings each of which is in contact with the seal ring and one of the piston rings, and which are installed on the outer circumferential surface (45) of the piston (4). Grooves for holding the backup rings are unnecessary. The diameter of the piston can be made relatively small with respect to that of the seal ring, resulting in the seal ring being easily installed on the piston.</p> |
