FIELD: mechanical engineering; conversion of heat energy into mechanical work. SUBSTANCE: two-stroke internal combustion engine has cylinder block with fitted-in pistons whose rods are mechanically coupled with connecting rods and crankshaft. Central and side stiffening ribs are made in central space of cylinder block. Compression cylinder has working area several times greater than working area of operating cylinder. Crankpin of crankshaft coupled with connecting rod of compression piston is displaced through 34-40 o and can be displaced through up to 180 o relative to crankpin coupled with connecting rod of operating piston in direction of crankshaft rotation. EFFECT: reduced overall dimensions, simplified assembling and design as a whole. 3 cl, 5 dwg
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