Fuel injection type internal combustion engine

Abstract

A fuel injection type internal combustion engine includes a cylinder head which is provided with a pair of intake valve bores facing a combustion chamber, a single intake passage, and a pair of intake ports between which a partition wall is interposed and which connect the intake passage and the intake valve bores to each other, and a fuel injection valve with a fuel ejection port disposed to be directed from the single intake passage toward the intake valve bores. Air assist ejection ports are disposed near the fuel ejection port for finely atomizing the fuel and are disposed at opposite sides of the fuel ejection port on a plane substantially including the fuel ejection port and that end edge of the partition wall which is closer to the intake passage, so that the air assist injection directions intersect each other and the fuel jet. This ensures that the fuel jet is narrowed in width at a portion corresponding to the partition wall by air flows from opposite sides, so that the entire fuel jet is flattened. Therefore, the narrowing of the width of the fuel jet at the portion corresponding to the partition wall makes it possible to suppress the deposition of the fuel on the partition wall and to suppress the deposition of the fuel on inner surfaces of the intake ports in the vicinity of their connections with the partition wall.