| 摘要 |
PURPOSE:To decrease the amount of fuel injection at the initial period of combustion with the fuel kept in properly mixed condition with the air, by furnishing a nozzle body with a plurality of jets in positions dislocated in circumferential direction from the lift direction of a needle valve, and putting the jets one after another in communication with the fuel supply passage. CONSTITUTION:When a needle valve 6 is lifted, No.1 and No.3 jets 5a, 5c at the foremost of a sack part 4 are put in communication with a fuel supply passage 2 via an injection passage 9, while No.2 and No.4 jets 5b, 5d at the tail of the sack part 4 are shut from communication by a seal 10. Accordingly a small amount of fuel is injected from No.1 and No.3 jets 5a, 5c, and put in pre-mixed combustion. If the needle valve 6 is further lifted, the No.2 and No.4 jets 5b, 5d are put in communication with the fuel supply passage 2 via the injection passage 9, while the No.1 and No.3 jets 5a, 5c are shut from communication by the seal 10. Thus a greater amount of fuel is injection from No.2 and No.4 jets 5b, 5d to be put in diffused combustion.
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