| 摘要 |
PURPOSE: To enhance lamination combustion and improve power consumption and emission while simplifying the structure without requiring a pressurized air supplying means to an air-fuel mixture feed port. CONSTITUTION: A swirl is generated in a combustion chamber 14 by the intake air from an intake port 16, and an air-fuel mixture feed port 25 is opened to the combustion chamber in a position close to an ignition plug about in the center part of a cylinder bore. A center valve 27 for opening and closing the air-fuel mixture feed port 25 is opened in the latter half of intake stroke, and the closing time of the center valve 27 is set to the latter stage of compression stroke, whereby the air in the combustion chamber is guided into the air-fuel mixture feed port in the latter period of compression stroke.
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