FUEL INJECTOR

PURPOSE:To improve the fuel atomization characteristic and uniformity by jetting fuel toward a cone member in a fuel injection passage, mixing the fuel with the air which flows into a fuel injection passage from an air passage and jetting the mixed gas into a suction passage after colliding with the flat part of the cone member. CONSTITUTION:On an injection valve body 4 arranged under a throttle valve body 1, a fuel injection passage 6 whose downstream side is opened toward the inside of a suction passage B is formed, and a spread inclined part 6C is formed towards an opened port edge part 6B from an expansion starting point A. Further, an injection valve injection passage 7 for jetting the fuel jetted from a fuel injection valve 5 into the fuel injection passage 6 is formed, and an air passage 8 whose one edge is opened in the suction passage B on the upstream side and the other edge is opened in the Fuel injection passage 6 on the upstream side from the injection valve injection passage 7 is formed. A cone member 9 is arranged in an enlarged inclined part 6C, and an annular gap is formed by a spread inclined projection part 9A and a spread inclined part 6C, and an annular gap which crosses nearly at right angle with the axis center line Y-Y is formed by the flat part 9D at the lower edge part of the spread inclined projection part and the lower edge part 10A of a fuel injection passage boss 10.