| 摘要 |
PROBLEM TO BE SOLVED: To simplify manufacture of a nozzle by making the nozzle such that only a first injection hole is open until a solid needle nozzle reaches a predetermined lift amount and a second injection hole opens when a predetermined lift amount is exceeded, while setting an injection angle of the second injection hole smaller than the injection angle of the first injection hole. SOLUTION: An injection hole 3 is formed at a tip of a needle nozzle body 1 which accommodates a needle nozzle 2 slidably. A diameter and an injection angleθ1 of the injection hole 3 are determined so that it is mainly adapted to low pressure fuel injection. Also, an injection hole 10 is formed in the needle nozzle body 1 from a position above a fuel pool 4 downward. The injection hole 10 is closed until the needle nozzle 2 reaches a predetermined lift amount, and when the predetermined lift amount is reached, fuel is injected through the fuel pool 4, a slit 11, and the injection hole 10. An injection angleθ2 of the injection hole 10 is smaller than the injection angleα1 of the injection hole 3, and the position at which the injection hole 10 is formed corresponds to that of the injection hole 3. Same number of injection holes 10 and injection holes 3 are provided.
|
