| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injector capable of preventing the degradation of swirling force of a fuel and of facilitating the atomization of the fuel without increasing the number of swirl holes. SOLUTION: The fuel having flown in a swirl chamber 42 from the swirl holes 43 formed in a swirler 40 swirls in the swirl chamber 42 and forms a swirl. The fuel having flown in the swirl chamber 42 swirls around the neck part 56 of a valve needle 50. Since the outside diameter of the neck part 56 is formed smaller than those of a second cylinder part 54 and a valve head part 57, the fuel having flown in the swirl chamber 42 swirls around the neck part 56 without colliding with the circumferential part of the valve needle 50. Accordingly, the generation of a swirling component in the direction opposite to the primary one due to the collision of the fuel with the circumferential part of the valve needle 50 is prevented, so that the degradation of the swirling force of the fuel is prevented. The number of the swirl holes 43 does not need to be increased in conjunction with the reduction of diameters of the swirl holes 43.
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