| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method of manufacturing a nozzle capable of restraining a curvature radius of an end curve surface of an injection hole inlet after polishing from becoming uneven, and a nozzle, or a fuel injection valve.SOLUTION: In a nozzle body 12 for a fuel injection valve 10, a groove 12j is formed on a sack part inner wall 12e through which fuel passes to have a width larger than a diameter of a first injection hole 12f and a second injection hole 12g to be bored. The groove 12j is recessed in a curved surface. The first injection hole 12f and the second injection hole 12g are bored so as to be connected with the groove 12j on one ends. A connection angle of the second injection hole 12g with the sack part inner wall 12e is different from that of the first injection hole 12f. Fluid polishing of connection portions of the sack part inner wall 12e and the first injection hole 12f and the second injection hole 12g is performed by feeding fluid for polishing from the sack part inner wall 12e to the injection holes.</p> |
