| 摘要 |
When diameters of an injection hole cup and an injection hole cup support are reduced, a distance between a welded connection part of the injection hole cup and the injection hole cup support and a valve seat portion or valving element guide portion of the injection hole cup is reduced, and the valve seat portion or valving element guide portion is deformed due to distortion generated at a time of solidification after welding. This is insufficient to maintain shape accuracy. A fuel injection valve according to the present invention has, between a welded fixation part and a valve seat and guide portion of an injection hole cup, such a form that rigidity is reduced with respect to distortion generated at a time of welding. As a result, the valve seat and guide portion of the injection hole cup is prevented from being deformed due to the distortion generated at a time of solidification after the welding, and it is possible to maintain desired accuracy and prevent an increase of leaking fuel and deteriorations of a flow rate and a spray variation. |
