Patent ID: 6935301
Filing Date: 2005-08-30
Classification: F02B,F02F,Y02T

Abstract:
1. A combustion chamber assembly for use in a diesel engine, comprising: a combustion chamber having a lower portion and an upper portion and being defined in a crown of a piston, the combustion chamber lower portion having a center portion, the center portion being defined at least in part by a portion of a convex sphere, the sphere having a radius and an origin, the origin of the radius lying on a piston central axis and the combustion chamber further having an outwardly radially disposed bottom margin, the bottom margin being defined in part by a portion of an annulus, the annulus being concave and having an origin and a radius; the combustion chamber upper portion having at least one step defining a flat surface disposed between the lower portion and the crown; and the combustion chamber having smooth annular transitions between adjacent surfaces, the surfaces including the spherical center portion and the annular bottom margin.