PURPOSE: To improve the fuel atomization characteristic and uniformity by mixing the fuel jetted toward a cone member in a fuel injection passage and the air introduced into the fuel injection passage from an air passage and jetting the mixed gas into a suction passage through the spread-inclined, annular and concentric gaps.
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 through an opened port edge part 6B is formed, and a spread inclined part 6C is formed towards the 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 from a throttle valve 3 and the other edge is opened in the fuel injection passage 6 on the upstream side from an opened port to the fuel injection passage 6 of the injection valve injection passage 7 is formed. A cone member 9 is arranged in the expansion inclined part 6C, and an annular, concentric and continuous gaps are formed downward from the upper part by a spread inclined projection part 9A and the spread inclined part 6C.
SUGA YOSHIMICHI
HIRANO KENICHI
OOTAKA AKIFUMI
