| 摘要 |
PROBLEM TO BE SOLVED: To suppress malfunction of a pressurized condition maintaining means, even in a case that acceleration acting on a piston is large. SOLUTION: A piston engine includes a piston 21 reciprocating in a cylinder. The piston 21 comprises: an accumulator 212 formed in a piston body 211; an introducing passage 214 connecting a working space with the accumulator 211 in the cylinder to introducing working fluid in the working space into the accumulator 212; and a reed valve 215 operating in a direction orthogonal to a movement direction. The piston 21 has a plurality of air supply holes 216 in a side peripheral part 211a of the piston body 211, and the working fluid in the accumulator 212 is jetted between the side peripheral part 211a of the piston body 211 and the cylinder. COPYRIGHT: (C)2006,JPO&NCIPI
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