FIELD: mechanical engineering. SUBSTANCE: blades are mounted on coaxially mounted shafts and separate the space of a housing into chambers of alternative volume. A mechanism for coupling the blades comprises levers rigidly connected with the shafts and planet gear transmission made up as solar gear rigidly secured to the housing and satellite gear. Two satellite gears are mounted on carrier coupled with the output shaft of the engine and lever through a crank mechanism. The gear ratio of the satellite and solar gear is equal to 1:2n, where n is an integer number. The lengths of the levers, radii of the cranks and angle of the blade openings are related by a relationship available in the invention description. EFFECT: enhanced efficiency. 4 dwg
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