To provide a mechanism for suppressing energy loss in an engine mechanism to be lower than that of a conventional engine mechanism, in particular, to provide a configuration, a shape and arrangement of an energy transmission mechanism (close to a rotary engine mechanism or a Judson supercharger structure, in conventional mechanisms).

Energy produced in a combustion chamber is directly transmitted to a rotor without routing a transmission mechanism such as a connecting rod. In each step of suction, compression, expansion and exhaust, a sliding vane and centrifugal force by the rotation of a shaft are effectively used. Thereby, combustion energy of a mixed gas is directly transmitted to the shaft, which eliminates energy loss due to absorption in an indirect route, and improves energy transmission efficiency.