| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a two-stroke engine for suppressing a phenomenon that scavenging gas is discharged as uncombusted gas and for discharging cleaner exhaust gas by improving combustion efficiency. Ž<P>SOLUTION: In the two-stroke engine provided with a crank chamber, a cylinder 2, scavenging ports 22a having an opening in the cylinder 2 and scavenging passages 22 for connecting the scavenging port and the crank chamber, a scavenging passage 22 is provided with a throttle part 22d which is formed by narrowing a passage section area in a middle of the passage and a scavenging port side of the throttle part 22d is in a tapered form 22e expanding from a narrowest part. Two sets of exhaust passages are provided for each cylinder 2 and a scavenging port (a first scavenging port) of a set which is at a side closer to the exhaust port is opened by the piston reciprocating in the cylinder before the scavenging port (a second scavenging port) of the set locating at a side farther from the exhaust port. The throttle part 22d is provided in the scavenging passage connected with the first scavenging port. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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