FIELD: mechanical engineering. SUBSTANCE: piston 2 has head 3 and skirt 4 (guide portion) provided with opening 5 for the piston pin. The bearing surfaces of the skirt are bounded with curves 6 and 7 and define X-shaped convex areas on the opposite sides of the skirt asymmetrical with respect to the longitudinal axis. The shape and profile of the areas are defined by relationships presented in the invention description. EFFECT: enhanced reliability. 3 dwg
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