On the shaping of the tooth profile of common non-circular gears using rack and Novikov tooth profile

Authors: Nguyễn Hồng Thái*, Nguyễn Thành Trung, Nguyễn Thùy Dương*, Nguyễn Hoàng Việt


Non-circular gear units have been used in variable transmissions such as car wipers, CVT speed variants or the steering mechanism of new generations of cars, etc. Until now, when researching these gears, most scientists are focused only on non-circular gears with involute profile of a circle or a hyperbola and the Novikov-type profiles have not been mentioned. In this paper, the authors use the Novikov gears and racks to generate the tooth profile of of non-circular gears. To solve this problem for each pair of gears in a gear train, the tooth profile of the driving gear is formed by finding the envelope of a Novikov rack, while the tooth profile of the drive gear is formed using gear shaping method (with the driving gear used as the cutter) to ensure meshing ratio and to prevent undercutting. Based on that, the study provides a general procedure for the synthesis of Novikov non-circular gears.


Novikov gears, noncircle gears, simple gear train system, profile design.
Pages : 11-17

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