| 摘要 |
An engine in which a gas chamber (16) where a biassing force directed from the thrust side to the anti-thrust side by virtue of the pressure of gas introduced from an engine combustion chamber (6) acts on a piston (2) is formed between a pair of piston rings (3 and 4), in which a gas passage (33) allowing this gas chamber (16) and the engine combustion chamber (6) to communicate with each other so as to introduce the gas pressure inside the engine combustion chamber (6) into the gas chamber (16) and a valve mechanism (20) for opening and closing this gas passage (33) are provided on the piston (2), and in which a control mechanism (44) for controlling the opening and closing motion of this valve mechanism (20) relative to the gas passage (33) is provided. |
