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The gear is widely used in all kinds of machinery and equipment, such as vehicles, machine tools, speed reducers and other transmission gearbox. In general, the gear is mainly used to pass a certain speed ratio, and to increase or decrease the torque. Although in recent decades gear design and manufacturing technology has been greatly improved, but the presence of the axial force of the gear as well as the carrying capacity of less than restricting the development of gear technology. Therefore, research and better performance gear is necessary. In this paper, the involute arc cylindrical gear is a new form of gear, engaging performance, large overlap coefficient, axial forces cancel each other out, high transmission efficiency, flexural strength, tooth contact strength advantages . Its superior transmission characteristics, in most applications environment instead of straight teeth, Helical and herringbone spur gear applications, but also has smooth transmission, low noise transmission, high efficiency, long service life, the use and installation requirements low characteristics, can be applied to the arc gear pump, arc tooth reducer many ways, and has broad application prospects. The gear History are still many theoretical and practical application of issues need to be addressed, such as: limited processing technology toothed parameters is not yet carrying capacity study was not thorough enough processing method is not ideal, and so, so There is a need to study it further. This article describes the history of development and research status of the gear, the gear meshing mechanism discussed to determine the geometric parameters. Gear meshing mechanism deduced involute arc cylindrical gear meshing characteristics, including tooth surface equation, conjugate tooth surface equation meshing line equation and equation of the line of contact. In this paper, the calculation method of the involute arc cylindrical gear tooth contact stress and tooth root bending stress. Arc cylindrical gear model, using the finite element analysis method to contact their gear Vice tooth surface fatigue strength as well as tooth root bending fatigue strength analysis and comparison with other cylindrical gear display its superior transmission characteristics. The paper also analyzes the existing arc cylindrical gear processing methods lack point, reliable and effective processing method. Summary and Next thesis work papers outlook. I believe arc cylindrical gear will continue to improve, with the deepening of research work, has a distinct advantage in the gear, its application prospects.
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