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(11) | EP 2 589 792 A8 |
(12) | CORRECTED EUROPEAN PATENT APPLICATION |
published in accordance with Art. 153(4) EPC |
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(54) | FUEL INJECTION VALVE AND INTERNAL COMBUSTION ENGINE |
(57) A fuel injection valve includes: a nozzle body provided with an injection hole at
a tip portion; a needle that is located slidably in the nozzle body and includes a
seat portion seated on a seat position in the nozzle body; and an air bubble generation
means generating air bubbles in a fuel flowing through the nozzle body, and when a
curvature radius is R, a length of a curve is L and a constant is a, an inner peripheral
shape of the injection hole includes a curving part passing through a region surrounded
by a clothoid curve which is expressed by R × L = a2 and of which the constant a is 0.95 and an clothoid curve of which the constant a
is 1.05 or a region surrounded by approximate curves of the clothoid curves at a cross-section
surface along a direction of axis of the injection hole.
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