FIELD: engine engineering. SUBSTANCE: engine has cylinders, pistons 6,7, shafts, rotating bushing 14 with bearings, and sucking and blowing passages. The sucking passage is provided in the middle outer zone of the rotating bushing. By-pass passages of the cylinders are directly connected with outer spaces of rotating bushing 14. Interpiston space is in communication with the sucking and blowing passages trough bearings of rotating bushing 14. EFFECT: enhanced silencing. 3 dwg
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