| 摘要 |
PURPOSE:To distribute an air-fuel mixture so rich to the vicinity of an ignition device and make it ignite effectively and accurately, by forming a step part for forming a collecting space converting injection fuel on a combustion chamber inner wall, and installing this ignition device in the collecting space. CONSTITUTION:In a combustion chamber 2, there is provided with a step part 14 which forms a collecting space D being projected from the inner wall 2b and collecting injection fuel (f) out of a sub-nozzle hole 9. An ignition device 15 of a spark plug or the like for igniting an air-fuel mixture M to be collected is installed in this collecting space D. A rich mixture is distributed to the inside of this collecting space D, igniting the rich mixture with the ignition device 15. Thus, ignition effectively and accurately carried out so that a misfire is preventable.
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