Hybrid internal combustion engine (variants thereof)

A hybrid internal combustion engine comprising:

• a casing having an annular working chamber and an intake port, exhaust port, overflow channels, and a planetary gear, the engine comprising:
• two drive shafts coaxial with the annular surface defining the working chamber and provided with rotary pistons on one side and with arms on the other side;
• at a stationary central gear wheel coaxial with the annular surface of the working chamber and the drive shafts;
• an output shaft concentric with the drive shafts and having an offset portion fixedly carrying a carrier and a planetary gear;
• connecting rods pivotally connecting the carrier and the arms of both drive shafts,
• characterized in that
• the planetary gear fixed on the carrier has internal teeth in mesh with the stationary central gear having external teeth with a gear ratio
• i=(n+1)/n (where n=2, 3, 4, 5 . . . -a series of integers), where n equals the number of rotary pistons mounted on each of the drive shafts,
• wherein the overflow channels are adjacent to the working chamber and connect the compression and expansion sections thereof.