ELECTROMAGNETIC FUEL INJECTION VALVE

In regard to a junction between a metal joint and an electromagnetic fuel injection valve, a screw structure or the like is used to secure the higher sealing property and strength than those of the conventional valve as illustrated in PTL 2, and thus, the valve becomes larger in general than the conventional valve using an O-ring structure illustrated in PTL 1. In addition, there is an example in which resistance welding is used, as illustrated in PTL 3, in order to provide a smaller size than the screw structure as another embodiment. In this case, it is necessary to increase a dimensional accuracy of a plane on which the resistance welding is performed in order to reduce a positional deviation or squareness between the metal joint and the electromagnetic fuel injection valve. In addition, welding distortion is caused by contraction generated after the welding if the amount of weld penetration through the welding is significantly increased in order to secure the high strength, which leads an increase in the amount of the positional deviation or an increase in the squareness even when the dimensional accuracy of the plane on which welding resistance is performed is increased. In the present invention, a core as one of components that configure an electromagnetic fuel injection valve is joined with a metal joint by welding to have each melting amount of welded portion of the metal joint and the core being set such that a metal joint side has a larger melting amount than a core side. Further, a metal joint end surface, a fuel seal portion having a smaller cross-sectional area than an area of the metal joint end surface, and a core end surface having a larger area than the cross-sectional area of the fuel seal portion are provided such that the metal joint end surface and the core end surface communicate via the fuel seal portion.