| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection device having high production efficiency, accelerating the atomization of fuel without an increase in the number of nozzle holes. SOLUTION: A nozzle hole plate 70 has a first face portion 81 in which fuel inlets of the nozzle holes 71 are opened and a second face portion 82 located closer to a valve body side than the first face portion 81. A step portion 83 is formed between the first face portion 81 and the second face portion 82. The step portion 83 accelerates the flow of fuel from the first face portion 81 to the nozzle holes 71 and limits the flow of fuel from the second face portion 82 to the nozzle holes. The fuel flowing into the first face portion 81 flows in the same direction to strengthen the flow and collides with the step portion 83 to form a swirl flow. Because the step portion 83 limits the flow-in of the fuel from the second face portion 82, the flow of the fuel is prevented from being weakened on the first face portion 81. Thus, the atomization of the fuel is accelerated without an increase in the number of the nozzle holes 71 even when formed in simple cylindrical shape. COPYRIGHT: (C)2004,JPO&NCIPI
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