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 (similar to a rotary engine mechanism or rotary shoe type drum brake mechanism in conventional mechanisms), and to efficiently suppress energy loss by adding a motor mechanism to a rotation shaft.

Energy produced in a combustion chamber is directly transmitted to a rotation shaft without routing a transmission mechanism such as a connecting rod. In each step of suction, compression, expansion and exhaust, a hook shoe and centrifugal force by the rotation shaft are effectively used. By the method, combustion energy of a mixed gas is directly transmitted to the shaft, which eliminates energy loss due to absorption in an indirect route, and increases energy transmission efficiency. By assembling a motor mechanism, waste of energy can be prevented.