| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection valve capable of reducing variation of a fuel injection amount under a negative pressure, and easily adjusting a flow rate.SOLUTION: A fuel injection valve having a fuel injection hole 220 formed at a downstream side of a valve seat which a valve element sits on or separates from, a swirl chamber 212 having a bottom surface 212B with an inlet opening of the fuel injection hole 220 and an inner peripheral face 212A surrounding the circumference of the bottom surface 212B, and provided with a fuel swirling flow channel around the inlet opening of the fuel injection hole 220, and a lateral passage formed on the swirl chamber inner peripheral face 212A to supply a fuel to the swirl chamber 212, further includes a first curved portion 301 formed on a connecting portion of the swirl chamber inner peripheral face 212A and the swirl chamber bottom surface 212B in a state of being recessed to an inner side of the swirl chamber 212, and a second curved portion 302 formed on a connecting portion of the swirl chamber bottom surface 212B and a fuel injection hole inner peripheral face 220A in a state of being projected toward the inner side of the swirl chamber 212.SELECTED DRAWING: Figure 4 |
