Abstract
A novel rotational internal combustion engine is invented and investigated. No eccentric rotational component is used in this engine, resulting in vibration-free operation. The engine consists of rotor casing and two types of rotor; cycloid rotor and trochoid rotor. The shape of the cycloid rotor is characterized by epicycloid surface, and the trochoid rotor also superior-epitrochoid surface. In this paper, first, the typical configuration is shown, next, two procedure for designing the rotors are described in detail. Furthermore the design drawing of the prototype engine is given and its cyclic behaivior, the time variations of the chamber volume and the estimated pressure are indicated. The result of detail investigation for geometry of the engine configuration shows that the most appropriate combination of numbers of cycloid tooth and trochoid cavity is Nc:Nt=2:3 for engine compactness and compression ratio.
