| Summary: | 碩士 === 國立中央大學 === 機械工程學系 === 107 === Generally, the advantages of the rotary engine are its compact size and light weight with high horsepower. The rotary engine can be used as a backup power source for the electric vehicle to allow extra mileages when the car battery is low and needs to be charged. The purpose of this thesis is to develop an innovative limacon (蚶線) slide rotating plate rotary engine, which not only has the aforementioned advantages but also has simpler design and structure than the conventional Wankel rotary engine. We apply SolidWorks (a 3D computer aided software) to design the limacon slide rotating plate rotary engine that mainly includes the compression part and the power part, each having an intake port and an exhaust port. Both parts consist of a limacon cylinder, a rotor and a slide rotating plate, but they have 180° mirror inversion. The shafts extend from both sides of the rotor to output power and the slide rotating plate divides the limacon cylinder into two separate compartments. With the rotation of the rotor and the slide rotating plate, two spaces change their volume for the compression stroke or the expansion stroke. The design of the power part and the compression part is basically the same, except that the area and the position of the intake port and the exhaust port are different. The power part is set by 180° mirror with respect to the compression part, in which there is a 15° phase difference between the compression rotor and the power rotor. The fuel/air mixture is injected into the compression cylinder, which is compressed to the power part through the rotation of the compression rotor and the slide rotating plate. The mixture is ignited when the intake port of the power part is closed. The high pressure burned gases drive the slide rotating plate, rotate the rotor of the power part, and output power by the shaft. Note that the compression rotor coaxially rotates with the power rotor synchronously. Because the cylinder of this engine is splited into two separate spaces that operate at the same time, there are two explosive power strokes per 360°, which is better than the piston engine(one explosive power stroke per 720°). Finally, the metal model of the compression part is manufactured by CNC processing. The exhausted flow rate, the compression pressure and the friction loss are measured to verify the design concept and the compression efficiency of the engine. Based on this compression part model, a complete construction of the limacon slide rotating plate rotary engine including the power part is designed and manufactured, which also combines the carburetor, the starter motor, the weight-balanced flywheels, the spark plug ignition system, and the cooling flow passage design.
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