Patent ID: 6928997

Claim:
A direct injection engine comprising: a combustion chamber formed between a lower surface of a cylinder head that is formed as a pent roof shape and an upper surface of a piston head with a pent-roof-shaped protrusion portion corresponding to a shape of the lower surface of the cylinder head; an intake valve and an exhaust valve that are respectively disposed in an intake port and an exhaust port that are formed in the cylinder head; a spark plug that is disposed in the cylinder head; and a fuel injector for directly injecting fuel into the combustion chamber, wherein the protrusion portion of the piston head is formed in a state of being biased toward an exhaust valve side from a cylinder center axis, a bowl is formed on the protrusion portion along a direction perpendicular to a direction of a crankshaft axis, an exhaust-valve-side portion of the bowl is opened, a width of the exhaust-valve-side portion of the bowl is wider than a width of an intake-valve-side portion thereof, side walls of the bowl are formed as curved surfaces that are indented toward the outside, a bottom surface of the bowl is slanted such that a depth of the bowl becomes deeper when approaching the intake-valve-side portion, and the intake port is formed such that intake air moves toward the exhaust-valve-side portion of the bowl.