| 摘要 |
Fuel injection direction is invariant even if a protrusion is deformed after an injection hole plate is welded to a valve seat, variation in welding does not cause variation in fuel injection direction, and deterioration in valve oil tightness is suppressed after welding. In a fuel injection valve having a valve element for opening/closing a valve seat and ejecting fuel from a plurality of ejection holes, provided in an ejection hole plate welded to the downstream side of the valve seat by a welding portion, through the gap of the valve element and the valve seat when the valve seat is operated by receiving an operation signal from a controller, a protrusion having an arcuate cross-section is provided in the center of the ejection hole plate substantially axis symmetrically to the axis of the valve seat. The welding portion is also substantially axis symmetrical to the axis of the valve seat, inlet of the ejection hole is located on the ejection hole arranging surface on the radial outside of the protrusion and on the radial inside of the inner wall of valve seat opening which is the minimum inside diameter of the valve seat, and the ejection hole arranging surface is coplanar to the surface having the welding portion.
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