| 摘要 |
PURPOSE:To prevent deterioration of thermal efficiency and knocking from occurring by facilitating starting, by so constituting that a plurality of spark plugs are provided by fronting on a combustion chamber of kerosene, and one of the spark plugs is arranged within a recessed combustion chamber so that an air-fuel mixture sojourns within the recessed combustion chamber and is heated. CONSTITUTION:Two spark plugs 5, 6 are arranged by fronting on a combustion chamber 4 of kerosene. A spark gap of the one side spark plug 6 is on the bottom of a cylindrical recessed combustion chamber 7 opened in the combustion chamber 4. A ceramic heat accumulating material 8 is being secured to form the recessed combustion chamber 7, an electric resistor 10 is built in a thick part of the heat accumulating material 8 so that an inner surface 9 is surrounded by the resistor 10 and the resistor 10 is connected in series with an electric power source through lead wires 11, 12. When a switch 13 is turned ON during operation, the resistor 10 is heated and the inner surface 9 of the heat accumulating material 8 is heated. An air-fuel mixture, therefore in the inside of the recessed heat accumulating chamber 7 is heated and turned into an ignitable atmosphere. The resistor 10 is electrified at the time of starting under a low temperature and idling, and evaporation of kerosene in the inside of the recessed combustion chamber 7 is made to accelerate. |
