| Summary: | 碩士 === 國立交通大學 === 機械工程系所 === 95 === The gear is an important mechanical component for transmitting powers. Since the cylindrical helical gear has high efficiency to transmit power, therefore, it is widely used in reduction mechanisms by industry. The internal gear is a gear mechanism usually used for reduction gear box. Compared with the external gear, the center distance of the internal helical gear is smaller, the contact stress is lower and the gear meshing is also more smoother. However, due to the manufacture and assembly errors, the gear set may lose its conjugate meshing condition, which may cause the bad contact situation. Therefore, gear tooth modifications are widely used by the industry to reduce the transmission error of the gear pair.
In this thesis, according to the theory of gearing and gear generation mechanism, a mathematical model for internal helical gears with crowned and profile-shifted modification teeth has been developed under the assumption of gear wheel is a rigid body. Based on the gear meshing theory, mathematical model of tooth contact and bearing contact analysis are established.
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