| 摘要 |
PROBLEM TO BE SOLVED: To provide a reverse-flow type two-cycle engine capable of effectively suppressing the blowby of a fresh mixture (unburned air-fuel mixture), further improving scavenging efficiency and burning efficiency, and also improving the durability and output stability of a cylinder and a piston. SOLUTION: The two-cycle engine includes a pair of or a plurality of pairs of scavenging passages (31 and 31, 32 and 32) which adopt reverse-flow types so that a combustion operating chamber (15) formed above the piston (20) and a crankcase (18) communicate with each other. At least most of the pair of scavenging passages (32 and 32) form passages with partition walls (32k, 32k). Slit openings or through-holes which are formed in generally triangular shapes whose upper parts or entire parts are narrowed upward and which serve as scavenging inlets (32a, 32a) are formed at least one of the partition walls (32k, 32k) at the bottom end. COPYRIGHT: (C)2011,JPO&INPIT
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