| 摘要 |
PROBLEM TO BE SOLVED: To make liquid fuel difficult to stick to an ignition plug in the case that injected fuel is not sufficiently vaporized in a cylinder injection type spark internal combustion engine, which leads the fuel injected in the recessed cavity formed on the top of a piston near the ignition plug along the contour of the cavity. SOLUTION: This internal combustion engine is provided with a cavity 8, which is formed on the top of a piston 5, an ignition plug 6 facing inwardly of the cavity 8, and a fuel injection valve enabling fuel injection into the cavity. The cavity 8 has a sidewall 8b opposing to the fuel injection valve to lead the fuel vaporized in the cavity 8 near the ignition plug 6, and the sidewall 8b is provided with a step section 8c projected in the internal direction of the cavity 8.
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