Patent ID: 7028662
Filing Date: 2006-04-18
Classification: F02B,Y02T

Abstract:
1. A direct fuel injection engine comprising: a combustion chamber; a piston disposed in the combustion chamber to move along a cylinder center axis, the piston including a top surface having a first outer cavity having a first cavity center axis, and a second inner cavity located entirely in the outer cavity in a top plan view and having a second cavity center axis offset from the cylinder center axis of the piston in a direction perpendicular to the cylinder center axis; a spark plug having a tip arranged in an upper area of the combustion chamber to ignite a fuel-air mixture inside the combustion chamber; and a fuel injection valve arranged in the upper area of the combustion chamber to inject a fuel stream directly into the combustion chamber towards the outer and inner cavities in the top surface of the piston, the fuel stream having an injection center axis that is slanted relative to the cylinder center axis.