Patent ID: 8813713

Claim:
A piston having a crown and a crown diameter, the piston comprising: a piston bowl formed in the crown, the piston bowl comprising: a center portion having a generally convex spherical shape with a radius originating from a piston central axis, the center portion including an apex; a floor having a generally convex frusto-conical shape disposed symmetrically around the piston central axis adjacent the center portion; a base having a generally concave toroidal shape surrounding the floor; and a cylindrical wall having a length along the piston central axis, the cylindrical wall tangentially extending from the base and surrounding at least a portion of the center portion and defining a piston bowl diameter; a top surface having a flat annular shape disposed perpendicularly around the cylindrical wall along a rim of the piston bowl, an apex clearance being defined between the apex and the top surface along the piston central axis; wherein the piston bowl has a depth defined between the top surface and a bottom edge portion disposed between the base and the floor along the piston central axis; wherein a ratio between the depth of the piston bowl and the length of the cylindrical wall is less than 4; wherein a ratio between the diameter of the piston bowl and the depth is at most 4.7; wherein a ratio between the crown diameter and the apex clearance is approximately 85; and wherein a ratio between the piston bowl diameter and the apex clearance is approximately 61.