| 摘要 |
PROBLEM TO BE SOLVED: To provide a stratified scavenging two-stroke internal combustion engine supplying a combustion chamber with a new mixture after pushing out combustion gas to an exhaust port only by the air fed to the combustion chamber in a scavenging stroke. SOLUTION: An air reservoir chamber 33 is provided on the way of a scavenge air passage 52 connecting a scavenge port 17 to the bottom part of a crank chamber 10, and air is supplied from an air passage 18 of a carburetor to the combustion chamber 3 via an air control valve 21, the air reservoir chamber 33, an air passage 5 and the scavenge air passage 52. A rotary valve element 44 of the air control valve 21 is formed at a crankshaft 14 to open/close the air passage 18 and air passage 5.
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