Generation of a double-crowned involute helical gear with twist-free tooth flanks by a CNC hobbing machine with three synchronous axes

Authors

  • Van-The Tran National Central University, Jungli City, Taiwan. Hung Yen University of Technology and Education

DOI:

https://doi.org/10.15625/0866-7136/8005

Keywords:

Gear hobbing, modified rotation angle, tooth flank twist, contact ellipse, transmission error

Abstract

In the conventional hobbing process, a double-crowned involute helical gear is generated by the hob cutter with parabolic-curve tooth profiles for the cross-profile crowning and varied the center distance between the hob and work gear for the longitudinal crowning. Therefore, to cut a double-crowned helical gear not only requires at least four synchronous axes and hob cutter regrinding (which increases production costs) but also induces twisted tooth flanks on the generated work gear. In this paper, I propose a hobbing method by applying a modified work gear rotation angle that enables double-crowning of involute helical gear's tooth flanks using a standard hob cutter and a computer numerical control (CNC) hobbing machine with only three synchronous axes. The proposed method has also verified by using two computer simulation examples to compare the meshing-conditions, contact ellipses, and transmission errors of the double-crowned gear pairs with that produced by applying the conventional hobbing method. Computer simulation results reveal the advantages of the proposed novel hobbing method.

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Author Biography

Van-The Tran, National Central University, Jungli City, Taiwan. Hung Yen University of Technology and Education

Postdoctoral, Department of Mechanical Engineering, National Central University

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Published

21-06-2017

How to Cite

Tran, V.-T. (2017). Generation of a double-crowned involute helical gear with twist-free tooth flanks by a CNC hobbing machine with three synchronous axes. Vietnam Journal of Mechanics, 39(2), 97–108. https://doi.org/10.15625/0866-7136/8005

Issue

Section

Research Paper