Patent ID: 6070566
Filing Date: 2000-06-06
Classification: F02B,Y02T

Abstract:
A direct fuel injection internal combustion engine including a combustion chamber defined by a cylinder head having a spark plug, a fuel injector, an air intake comprising a first and a second intake port on an intake side of the cylinder head with a swirl control valve, an exhaust on an exhaust side of cylinder head, a cylinder bore, and a piston with a piston head having a vaporization portion, the piston being received in the cylinder bore below the cylinder head, the piston head comprising;a bottom surface formed with a predetermined depth and gradient;an arc-shaped first wall connected to the bottom surface and formed below the exhaust side of the cylinder head;an arc-shaped second wall connected to the bottom surface and also formed below the exhaust side of the cylinder head;a protrusion portion formed between the first wall and the second wall; andan arc-shaped third wall connected to the bottom surface and formed below the intake side of the cylinder head;wherein if first and second imaginary perpendicular lines are drawn over the top of the piston to intersect a center line of the piston, dividing the same into four equal sections, the first perpendicular line being positioned between the first and second intake ports, the second imaginary perpendicular line intersecting and being perpendicular to the first imaginary perpendicular line at the center line of the piston, and three imaginary distance lines being drawn parallel to the second perpendicular line, the first imaginary distance line extending from a tip of the protrusion portion, the second imaginary distance line extending from a point on the first arc-shaped wall farthest away from the second perpendicular line, and the third imaginary distance line extending from a point on the second arc-shaped wall farthest away from the second perpendicular line, wherein if a first distance between the second perpendicular line and the first distance line is ""a"", a second distance between the second perpendicular line and the second distance line is ""b"", and a third distance between the second perpendicular line and the third distance line is ""c"", an inequity is a<b<c, and wherein the fuel injector is oriented at an angle of 10.about.20.degree. with respect to a horizontal line passing through the fuel injector and the center line of the piston.