FIELD: mechanical engineering; engines and compressors. SUBSTANCE: trapezium shaped circular groove made on inner side surface of cylinder is filled with material whose strength characteristics are not high. At stable force of friction of upper piston ring against working surface of cylinder high compression properties of cylinder-piston group are maintained over entire period of operation and breakage of upper piston ring and land between piston ring grooves in piston is precluded. EFFECT: improved performance and technological properties of cylinder-piston group. 2 dwg
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