| 摘要 |
PROBLEM TO BE SOLVED: To uniformly mix a natural gas as fuel and intake air. SOLUTION: A fuel jet port 20a for jetting a natural gas as fuel injected from an injector 4 is formed in the inner wall surface 3a of each intake pipes 3, and the fuel injection surface 4a of the injector 4 is located at a position having a predetermined distance from the fuel jet port 20a while an injector port 20 is formed having its cross-sectional area which gradually decreases from the position of the fuel injection surface 4a to the position of the fuel jet port 20a. With this arrangement in which a flow of natural gas injected from the injector 4 is accelerated in the injector port 20 and is then jetted from the fuel jet port 20a, the jetted natural gas impinges upon a flow of intake air so as to uniformly mix the natural gas and the intake air.
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