| 摘要 |
A stopper mechanism includes a second cylinder disposed at an end in a first cylinder, a second piston disposed so as to be able to move according to a movement of a piston rod to be fitted into the second cylinder, and an annular piston ring having ends in a circumferential direction by being partially cut off. A circumferential groove is formed on an outer circumferential of the second piston. The circumferential groove includes a bottom surface, a one-side end surface, and an opposite-side end surface. The piston ring is axially movably disposed in the circumferential groove. The piston ring includes axial abutment portions, and radial abutment portions at the both ends of the piston ring. When the piston ring abuts against the one-side end surface of the circumferential groove, a first passage is forced between the one-side end surface and an end surface of the piston ring. |
| 主权项 |
1. A cylinder apparatus comprising:
a first cylinder sealingly containing hydraulic fluid; a first piston slidably fitted in the first piston and dividing an inside of the first cylinder; a piston rod coupled to the first piston; a rod guide disposed on one end side of the first cylinder and configured to slidably guide the piston rod with the piston rod inserted through the rod guide; and a stopper mechanism configured to function when the piston rod extends or compresses to reach an end in the first cylinder, wherein the stopper mechanism includes a second cylinder disposed at the end in the first cylinder, and a second piston disposed so as to be able to move according to a movement of the piston rod to be fitted into the second cylinder, wherein the second piston includes a circumferential groove formed on an outer circumference of the second piston, the circumferential groove including a bottom surface, a one-side end surface, and an opposite-side end surface, wherein an annular piston ring is axially movably disposed in the circumferential groove, the piston ring having ends in a circumferential direction by being partially cut off, wherein the piston ring includes axial abutment portions axially abuttable against each other, and radial abutment portions radially abuttable against each other, at the both ends of the piston ring, and wherein the stopper mechanism is configured in such a manner that a first passage is defined between an end surface of the piston ring and the one-side end surface when the piston ring abuts against the one-side end surface that is located at an end of the circumferential groove closer to the end in the first cylinder. |
