| 摘要 |
PURPOSE:To surely ignite an air-fuel mixture and prevent misfire from occurring by forming a stepped part in a combustion chamber, installing a nozzle with a subnozzle hole in the combustion chamber, and setting up an ignition device in the rear of the swirl flowing direction of the stepped part. CONSTITUTION:In a combustion chamber 1, there is provided with a stepped part 2 for producing stagnation T in a swirl S flowing in the rear. A nozzle with a main nozzle hole 14 and a subnozzle hole 15 is installed in the combustion chamber 1. Fuel is sprayed out of the subnozzle hole 15 to the stagnation T to be formed rearward in the flowing direction of the swirl S of the stepped aprt 2, and it is ignited by an ignition device 12 which distributes an air-fuel mixture densely on and around the ignition device 12 and thereby it is effectively and surely ignited. Thus, even if the fuel is of low cetane value, misfire is preventable.
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