FIELD: engine engineering. SUBSTANCE: engine has crankshaft, piston group mounted on the shaft, flywheel with eccentric housing, and torsion mounted inside the crankshaft. One end of the torsion is rigidly secured to the crankshaft. The other end of the torsion is coupled toothings of the flywheel housing through gears. The engine additionally has flywheel with eccentric housing, piston group, and counterweight mounted in the middle part of the crankshaft between the piston groups. The flywheels are pressed on the opposite ends of the crankshaft oppositely to each other. The housings of the flywheels have counterweights. The piston groups are set on the crankshaft to define a star. The ends of the torsion are coupled with toothings through gears mounted on the torsion. EFFECT: enhanced efficiency. 5 dwg
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