FIELD: engine engineering. SUBSTANCE: piston has head with heat belt and grooves for compressing and oil catch rings and skirt profiled so that a ratio of diametrical deviations from nominal diameter of the piston at the top edge of the heat belt, at bottom edge of the first inter- crank crosspiece, at the top zone of the skirt, at the bottom edge of the skirt to diameter of the cylinder at a given value of a distance from the bottom of the piston to nominal diameter result in optimization of the profile of side surface of the piston. Characteristic parameters for engines with spark ignition and Diesels are available separately. EFFECT: improved design. 4 cl, 1 dwg
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