FIELD: mechanical engineering; two-stroke internal combustion engines. SUBSTANCE: spring-loaded longitudinal members 8 are arranged on cylindrical surface of piston 5 in cavities between sealing rings 6. Members 8 play part of longitudinal seals forming, together with rings 6, closed sealed area on surface of cylinder 1 close to ports 2 and 3. EFFECT: prevention of overflowing of fresh charge and combustion products from one port to the other along clearance around piston 5; enlarged operating capabilities. 7 cl, 8 dwg
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