| 摘要 |
PROBLEM TO BE SOLVED: To prevent the offset of spray and improve valve sealing performance and the yield, by installing a means for generating swirl in fuel flow at the tip of the valve main body through which a needle valve passes to form the swirl flow generating means integrally at the tip of the valve main body. SOLUTION: A needle valve 12 is fit in a valve main body 9, which is contacted to and detached from a valve seat 11. Detaching motion of the needle valve 12 from the seat opens a fuel injection hole 10 to inject the fuel. In this case, a swirl generation portion 9c is formed in the valve main body 9 to provide a function of the turning body to generate swirl in the injected fuel flow. That is, two path holes 41s, a swirl groove 25 and an internal circumference circular groove 24 are formed in the valve main body 9. Also, high coaxial precision is obtained by simultaneously processing needle valve first and second sliding portions, 9a, 9b formed on the valve main body 9, the fuel is introduced to the swirl groove 25 through an axial direction passage 43 formed between a cylindrical portion 11a of the valve seat 11 and the valve main body 9, to generate the swirling flow.
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