Fuel injector

Abstract

A fuel injector injecting a fuel toward a combustion chamber mounted to a gasoline engine is provided with plural injection ports through which the fuel is injected. Each injection port includes an injection-port axial line limiting a pointing direction of the injection port, and the injection-port axial lines point to different directions. The injection ports include at least one intake injection port the injection-port axial line of which points to an intake space in the combustion chamber between a top surface of a piston of the internal combustion engine and an intake valve of the internal combustion engine. The intake injection port is defined by an inner peripheral wall surface extending in the injection-port axial line of the intake injection port and having a straight shape. The injection ports further include at least one exhaust injection port the injection-port axial line of which points to an exhaust space in the combustion chamber between the top surface of the piston of the internal combustion engine and an exhaust valve of the internal combustion engine. The exhaust injection port is defined by an inner peripheral wall surface separated from the injection-port axial line of the exhaust injection port toward an outlet opening and having an enlarged shape toward the outlet opening.