Patent ID: 8677970

Claim:
An internal combustion engine, comprising: an engine body; a cylinder head attached to the engine body; a combustion chamber positioned between the cylinder head and the engine body; and a piston, including a piston crown that forms a portion of the combustion chamber, located in the engine body, the piston crown including a central axis, a plurality of valve pockets arranged about the periphery of the piston crown in a plane perpendicular to the central axis, an uppermost surface portion, and a piston bowl positioned radially inward from the valve pockets, the piston bowl including: a compound radius including a radius R 1 , radius R 1 including a center of radius at a radial distance L 1 from the central axis, radius R 1 connected to and extending inwardly from the valve pockets to form a smooth transition between the valve pockets and the piston bowl; a frustoconical outer floor portion connected to the compound radius, the frustoconical outer floor portion extending a distance L 4 from the compound radius at an angle α 1 to a plane perpendicular to the central axis; an annular outer bowl portion including a radius R 5 ; and a spray-targeting feature positioned between the annular outer bowl portion and the frustoconical outer floor portion and including a radius R 3 with a center of radius located at an axial distance H 3 from the valve pockets, wherein each of the valve pockets includes a rolled edge extending between the valve pocket and the uppermost surface, the rolled edge including a radius to form a smooth transition between the valve pocket and the uppermost surface.