Computer aided design of a new combustion engine having only rotary parts

The paper presents a new internal combustion engine construction. The introductory part analyses the evolution of the antecedents, first the screw compressor line, than the progressive cavity type constructions. As a consequent step of the motor evolution it describes the model of a new three dimensional rotary combustion engine that has some advantageous features relatively to the existing motors. The main advantage of the construction is its simplicity. It has only two main rotary parts, a synchronising gear and an outer housing. The motion of the gas fluid happens in axial direction. The compression and the expansion of the explosive mixture takes place in the caves formed between the rotary parts. The CAD modeling of the rotor surface as well as the internal enveloped surface of the rotary chamber was carried out with Surface Constructor spatial kinematical modeling software application.