| 摘要 |
In a compression stroke and an exhaust stroke, a part of a mixture in a downstream intake passage 30b is introduced through a branch intake passage 50a into a crank chamber 20. The mixture introduced into the crank chamber 20 flows into a valve chamber 16 during the expansion stroke and the intake stroke. From which it flows back to an intake port 9 through a circulation passage 71, and is eventually charged into a combustion chamber 7 during the intake stroke. As the mixture passes through a first communicating passage 55 which allows fluid communication between the crank chamber 20 and the valve chamber 16, a gasoline component which is vaporized with comparative easy is vaporized by a heat released from a cylinder block 3 so that the mixture is separated into the lubricating oil and gasoline components.
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