| 摘要 |
The present invention is intended to prevent a cylinder wall from wearing, and prevent gas from leaking out a space between a piston ring and a cylinder wall. The subjects are resolved by using a piston device, comprising a piston pin (4), a piston cap (2), and a piston body (1) to be fitted to the piston cap (2), in which the piston cap (2) is provided with a closed piston ring (3). <IMAGE>
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