| 摘要 |
PURPOSE:To provide a low environmental pollution two-cycle engine by providing a double reciprocation piston double combustion chamber to reduce scavenging efficiency through reduction of an output in the vicinity of a top dead center. CONSTITUTION:At a proper time right before an output piston 2 approaches a top dead center, the pressure receiving sectional area of the contraction shape 9A of the inlet of a contraction combustion chamber 21 on the cover side is reduced to a value being, for example, 1/20 of an output combustion chamber 6 for separation. Most of air equivalent to a remaining amount is injected at a high speed in the contraction combustion chamber 21 on the cover side from a shorter way check valve 13A in such a state that a difference in a compression ratio is increased, and fuel injected through a fuel injector 10 is agitated and mixed at a high speed for combustion. In a contraction combustion chamber internal combustion engine, a combustion chamber is contracted so that optimum combustion is provided to be suitable for application, and complete combustion is completed on a best combustion condition. During heavy load operation, by effecting compression injection of a rotation air flow, complete combustion in a theoretical air-fuel ratio of incomplete combustion gas (CO) having high sepcic gravity is practicable.
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