FIELD: engine engineering. SUBSTANCE: engine has case, four cylinders arranged by two rows, piston rigidly connected to hollow rods and hollow lateral guide freely set on two slides mounted on cranks of two crankshafts. A mechanism for synchronizing movements of pistons is made of two rockers that interact with the lateral guides. Air is fed to the cylinders from receiver through lateral guide rods and pistons through check valves mounted in pistons. Gas discharging pipes are mounted on the pistons. EFFECT: enhanced efficiency. 4 cl, 9 dwg
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