INTERNAL COMBUSTION ENGINE

摘要

An internal combustion engine has a cylinder, a cylinder head mounted to the cylinder, a piston disposed in the cylinder, and a fuel injection valve. A combustion chamber is defined by the piston, the cylinder head and the cylinder. The fuel injection valve has a plurality of injection holes that injects fuel directly inside the cylinder from a side of the combustion chamber. The injection holes inject fuel in a spray shape with an overall shape, which is formed by a plurality of sprays being injected from the injection holes. The overall shape expands toward the cylinder head and forms one part of a conical shape that is dented near the piston. Central axes of some of the injection holes are oriented toward a boundary portion near the exhaust valve formed at a crown surface of the piston and an inner wall of the cylinder when fuel is injected.

主权项

1. An internal combustion engine having a combustion chamber defined by a piston and a cylinder, and a fuel injection valve having a plurality of injection holes and placed close to an intake valve so as to inject fuel directly inside the cylinder from the side of the combustion chamber, the internal combustion engine characterized in that:
the plurality of injection holes are configured so that the spray shape which is the overall shape formed by the plurality of sprays injected from the plurality of injection holes in the fuel injection valve expands toward the cylinder head and forms one part of a conical shape that is dented near the piston; and each of the central axes of a plurality of sprays injected from a plurality of specific injection holes is oriented toward a boundary portion near the exhaust valve formed at the piston position by the crown surface of the piston and the inner wall of the cylinder when fuel is injected, and among said plurality of injection holes, the central axis is oriented closer to the bottom dead center than to the boundary portion for the spray injected from one injection hole not included among said plurality of specific injection holes.