| 摘要 |
A two-stroke internal combustion engine ( 1 ) includes one pair or two pairs of scavenging passageways ( 31, 32 ) of reverse flow system where scavenging outlet ports ( 31 b, 32 b) are opened to the cylinder bore ( 10 a); the internal combustion engine being characterized in that an external air inlet port ( 42, 44, 46 ) for introducing external air into a combustion actuating chamber ( 15 ) formed over a piston ( 20 ) is formed at a portion of the cylinder ( 10 ) which is located closer to an exhaust port than a scavenging outlet port ( 31 b, 32 b) from which an air-fuel mixture (M) is introduced into the combustion actuating chamber ( 15 ) in a descending stroke of piston, and/or the external air inlet port ( 42, 44, 46 ) is formed at a portion of the cylinder ( 10 ) which enables the external air to be introduced into the combustion actuating chamber ( 15 ) prior to introduction of the air-fuel mixture (M).
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