Patent ID: 6868817

Claim:
A combustion chamber assembly for use in a piston of a diesel engine, comprising: a combustion chamber being defined intersecting a crown of the piston, the combustion chamber being defined by three curved surfaces of revolution only, adjacent curved surfaces having direct smooth junctures requiring no additional surfaces to effect the junctures, a combustion chamber first curved surface being a center portion, the center portion being defined at least in part by a surface being a portion of a convex sphere to define a post, the post being an upward extending generally central bottom portion of the combustion chamber, the sphere having a radius and an origin; a combustion chamber second curved surface defining at least in part combustion chamber bottom and side margins and being defined at least in part by an annular surface, the annular surface being concave and having an origin and a radius and being joined to the post; and a combustion chamber third curved surface being defined by an origin and a radius and being smoothly joined to the second curved surface and intersecting the crown of the piston.