| 摘要 |
<p>In a reciprocating engine, at the beginning of a combustion and expansion stroke while the engine is operated, a gas pressure (38) above a piston (2) is introduced into an annular gas chamber (31) through a recess (34), and the piston (2) is lowered by a gas pressure (39) introduced into the annular gas chamber (31) while being supported from a thrust side (12). A second piston ring comprises two piston rings (43, 43) superposed on each other.</p> |
