| 摘要 |
PROBLEM TO BE SOLVED: To generate intended engine output by burning all injected fuel as combustible air-fuel mixture, even if fuel diverts its flow to the ignition plug side sidewall direction of a cavity and the fuel injection valve side sidewall direction after the fuel collides with the wall surface of the cavity in stratified charge combustion. SOLUTION: In a cylinder injection type spark ignition internal combustion engine, a cavity 8 formed on the top surface of a piston is provided with a bottom wall 8a, an ignition plug side sidewall 8b and a fuel injection valve side sidewall 8c. Fuel is injected from a fuel injection valve 7 towards the bottom wall of the cavity in stratified charge combustion, and the injected fuel is advanced along the bottom wall to the ignition plug side sidewall, deflected by the ignition plug side sidewall, and guided to a vicinity of an ignition plug 6. A turn-up part 8e is provided on the fuel injection valve sidewall, in order to guide fuel 10b to the vicinity of the ignition plug, when a part 10b of injected fuel 10 is advanced toward the fuel injection valve side sidewall along the bottom wall.
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