| 摘要 |
PROBLEM TO BE SOLVED: To stably attach a fuel injection valve to a fuel pipe and a mounting hole of an internal combustion engine, without change in property. SOLUTION: The fuel injection valve 10 on which a mounting axial force N acts includes: a fuel injection end part 14 inserted and fitted in a small-diameter hole part 34 of the mounting hole 32; a loosely inserted part 17 loosely inserted in a large-diameter hole part 38 on a fuel pipe 20 side of the mounting hole 32; and a tapered face part 16 tapered toward a fuel injection end part 14 side from the loosely-inserted part 17. A washer 50 loosely inserted into the large-diameter hole part 38 on an outer peripheral side of the tapered face part 16 includes: a seat face part 54 slidable in a radial direction with respect to a stepped face part 37 expanded from the large-diameter hole part 38 of the mounting hole 32 to an inner peripheral side; and a curved projection face part 55 of which the diameter is enlarged toward a fuel pipe 20 side from the seat face part 54 side and is brought into contact with the tapered face part 16. A friction coefficient of the washer 50 with respect to the tapered face part 16 and the stepped face part 37 is μ, an inclination angle θ of the tapered face part 16 satisfies the expression of μ<cos<SP>2</SP>θ/(tanθ+μ×cosθ). COPYRIGHT: (C)2011,JPO&INPIT
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