Piston structure for internal combustion engine

摘要

A piston structure for an internal combustion engine is provided. This piston includes an oval slipper skirt with a cross sectional profile in the form of an ellipse defined by preselected major and minor axes. A difference between the major and minor axes is gradually increased nearing a lower edge of the skirt. The skirt distorts from an elliptical shape to a round shape when side thrust acts on thrust surfaces of the skirt to provide uniform contact with a cylinder wall.