| 摘要 |
PURPOSE:To prevent poor lubrication and prevent the emission of exhaust gas from being degraded by providing both No.1 scavenge passage which opens to a crank room at its one end and opens also to the cylinder wall of a combustion chamber at its other end, and No.2 scavenge passage which opens to the cylinder wall of the combustion chamber at its one end and is equipped with a check valve. CONSTITUTION:Air which is primarily compressed in a crank room 8, flows into No.1 scavenge passage 30 together with lubricant mist. And a mixture flows at low speeds into a cylinder combustion chamber 6 from No.1 scavenge passage 30. And supercharged air which is controlled of its flow rate by No.2 throttle vale 42, is fed directly at an earlier stage to the combustion chamber 6 from No.2 scavenge passage 40 through a check valve 43 for scavenging residual exhaust gas in the combustion chamber 6 quickly from an exhaust port 18. This constitution will neither cause poor lubrication nor degrade the emission of exhaust gas.
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