Fuel swirl generation type fuel injection valve and direct fuel injection type spark ignition internal combustion engine

Claim 1

A direct fuel injection type spark ignition internal combustion engine mounted with fuel injection valve, comprising: a piston, cylinder and cylinder head structure including a cylinder, a piston reciprocally movable in the cylinder between a top dead center position and a bottom dead center position, and a cylinder head; the cylinder, the piston and the cylinder defining a combustion chamber therein, the cylinder head including a projection protruding into the combustion chamber; a spark plug, coupled to the cylinder head, for igniting fuel; and a fuel injection valve, coupled to the cylinder head and located on an opposite side of the projection of the cylinder head with respect to the spark plug, for directly injecting the fuel into the combustion chamber, the fuel injection valve including: an injector assembly defining an injector axis and including an injector body and a valve member movable along the injector axis relative to the injector body; first orifice means formed in the injector body for injecting fuel therethrough, the first orifice fuel injecting means comprising a main fuel injection hole having a comparatively large diameter and extending at a comparatively small first inclination angle including 0° with respect to the injector axis, the main fuel injection hole being directed so as to inject fuel in the direction toward the piston; second orifice means formed in the injector body for injecting fuel therethrough, the second orifice fuel injecting means comprising a subsidiary fuel injection hole having a comparably small diameter smaller than the diameter of the main fuel injection hole and extending at a comparably large inclination angle larger than the first inclination angle of the main fuel injection hole with respect to the injector axis, the subsidiary fuel injection hole being directed so as to inject fuel in a direction toward the spark plug and onto a contact surface of the projection of the cylinder head, said first and second orifices being operated simultaneously; and means for causing fuel injected through the main fuel injection hole to widely spread when the fuel flows from the main fuel injection hole toward the piston.