| 摘要 |
PROBLEM TO BE SOLVED: To provide a two-cycle internal combustion engine capable of attaining the improvement in fuel economy and output and the reduction of a toxic component in exhaust gas and the like and suppressing the cost by reducing the blow-by quantity discharged without being burnt without largely changing a conventional engine structure. SOLUTION: A through-hole 25 or a communicating groove 26 is provided in the skirt part 20A of a piston 20 in order to allow scavenge inlets 30b and 30b provided on the upstream ends of scavenging passages 30 and 30. In the lowering stroke of the piston, a combustion waste gas E is introduced from a combustion working chamber 15 into the scavenging passages through the scavenge inlets 30a and 30a while blocking the scavenge inlets by the skirt part. Thereafter, an air-fuel mixture M is introduced from a crankcase to the scavenging passages through the through-hole 25 or communicating groove and the scavenge inlets synchronously with the lowering of the piston, and the combustion waste gas in the scavenging passages is introduced to the combustion working chamber as a scavenging flow prior to the air-fuel mixture.
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