Patent ID: 7278393

Claim:
A direct injection type fuel injection device having a fuel injection valve for injecting fuel into a combustion chamber in an internal combustion engine which includes an intake valve and an exhaust valve, and having a gas injection valve for injecting gas into the combustion chamber, the direct injection type fuel injection device comprising: said one fuel injection valve, with one or more fuel injection orifices being provided correspondingly to the fuel injection valve and opened into the combustion chamber; and at least said one gas injection valve, with one or more gas injection orifices being provided correspondingly to the gas injection valve and opened into the combustion chamber, the shape, size, direction, and arrangement of the fuel injection orifice being specified, the number, shape, size, direction, and arrangement relative to the fuel injection orifice, of the gas injection orifice being specified, wherein fuel injected from the fuel injection valve into the combustion chamber through the fuel injection orifice and gas injected from the gas injection valve into the combustion chamber through the gas injection orifice are brought into collision with each other, the gas injection orifice is disposed in the vicinity of the fuel injection orifice, the vicinity is defined by a distance (X) between a center of the fuel injection orifice and a center of the gas injection orifice, represented by the following expression: X ≦0.03 *d*P a 0.5 *ρ a 0.35 *ρ 0 −0.85 where “d” stands for the diameter of the gas injection orifice, “P a ” stands for an absolute pressure of the injected gas, “ρ a ” stands for a gas density under the absolute pressure of the injected gas, and “ρ 0 ” stands for a gas density of an injection site.