FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: proposed two-stroke internal combustion engine has housing, cylinder block, cylinder head, cylinder with piston, combustion chamber, intake and exhaust valves installed in cylinder head, accumulation space in cylinder head communicating at one side with air or working mixture pressure source and at other side, with combustion chamber. Cylinder head has movable cup in bottom of which bypass hole with seat is made. Combustion chamber is limited by cylinder head, outer surface of movable cup, cylinder wall and piston. Intake valve is arranged inside movable cup between inlet and bypass holes. Intake valve has two opposite sealing surfaces engaging with seats of inlet and bypass holes. Intake valve disconnects combustion chamber from accumulation space in process of combustion. After termination of working stroke, intake valve moves, together with movable cup in combustion chamber, towards piston bottom dead center. When intake valve stops together with movable cup in process of exhaust, space of movable cup before intake valve is filled with fresh charge. With piston moving towards top dead center, intake valve moves to inlet hole at movable cup stopped, thus communicating accumulation space through bypass hole with combustion chamber. Movable cup moves to intake valve after overlapping of inlet hole by intake valve. EFFECT: improved efficiency of two-stroke process, reduced resistance of air or working mixture getting in combustion chamber. 2cl, 4 dwg
