| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection valve with reliability constituting a nozzle body 48 with excellent durability in which excessive stress is hardly generated under a high pressure fuel. SOLUTION: Electrolytic processing of a suitable electrode shape and post-processing by a boring tool of a predetermined shape are performed on inner walls of a needle hole 45 of the nozzle body 48 and a bag hole part 45C connected/crossed to an inclined high pressure fuel passage 46 in order to make the crossing angle to an obtuse angle of 90°or more. Alternatively, a center of the bag hole part 45C is preferably made eccentric to the high pressure fuel passage 46 side or it is preferably crossed to the maximum diameter part of the bag hole part 45C. Thereby, the obtuse angle of the crossing angle is effectively retained, generation of excessive stress of the bag hole part 45C inner wall is suppressed and breaking of the nozzle body by crack is prevented. COPYRIGHT: (C)2006,JPO&NCIPI
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