Plunger piston for internal combustion engines

摘要

An extremely light and low friction plunger piston for internal combustion engines, particularly Otto-type engines for private cars. The piston has the following ratios and dimensions (H/D)=0.20-0.35 (T/D)=0.22-0.38 (A/D)=0.15-0.25 (B/D)=(A/D) wherein D=piston diameter H=compression height between a top of the head and the gudgeon pin bore axis T=distance from the radially outer boss faces to the piston axis A=axial skirt dimension below annular groove nearest the pin bore axis at a peripheral zone of the skirt extending over an angle alpha of 15 to 60 degrees to either side of a connecting rod oscillating plane B=axial skirt dimension below said annular groove in a direction along said gudgeon pin axis; and further wherein the distal end of the skirt is reduced radially over an axial dimension of 10-25% of an axial length of the skirt in said direction along said gudgeon pin axis, said distal end being reduced at its edge by 0.01-0.15 mm.