Patent ID: 6047592
Filing Date: 2000-04-11
Classification: F02B,F02F,Y02T

Abstract:
A four-stroke internal combustion engine with spark ignition and direct fuel injection into the combustion chamber, comprising:a reciprocating piston per cylinder, and a roof-shaped combustion chamber top with two or more intake valves as well as intake ports generating a tumble flow in a combustion chamber and arranged on one side of a longitudinal center plane defined by a crankshaft axis and a cylinder axis, as well as a fuel injection device located on an intake side between the intake ports and directed towards a center of the cylinder, and an ignition source located in an area of the cylinder axis in a combustion chamber roof, wherein the piston is provided on its top surface next to the combustion chamber with an H-shaped configuration of flow guiding ribs, of which two longitudinal ribs located at a distance from each other and the cylinder axis, are arranged transversely to the crankshaft axis, and a cross-rib runs between the longitudinal ribs, which is in parallel with the crankshaft axis in at least one point, the piston top face assuming a continuously curved, concave shape between the guiding ribs, and fuel injection being directed into one of the concave areas obtained in this manner.