Modification and optimization of spatial tooth profile for harmonic drive considering machining fillet feature in the hobbing process

IF 3.7 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology Pub Date : 2025-07-02 DOI:10.1016/j.precisioneng.2025.07.003

Feifei Yuan, Ke Xiao, Linjun Li, Yanfeng Han, Cheng Wang, Guo Xiang, Xiujie Chen

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Abstract

This paper studies the modification and optimization of spatial tooth profile for harmonic drive, especially considering machining fillet feature in the hobbing process. The work begins with an analysis of the spatial deformation of the flexspline and its motion trajectory, allowing for the determination of an envelope for the motion trajectory of flexspline teeth. Based on the hobbing process characteristics, we propose a modification calculation method by calculating the vertical distance at engagement points between this envelope and the circular spline teeth profile, the modification values that ensure non-interference engagement is obtained. Besides, the introduction of the machining fillet feature into the tooth profile design is explored, revealing its positive impact on the stress distribution of harmonic drive. A finite element model is utilized to assess the effectiveness of modification and optimization of spatial tooth profile for harmonic drive. Finite element simulation results demonstrate that the modification and optimization considering fillet feature proposed in this paper effectively redistributes contact stress towards the middle section of the teeth and improves stress concentration at the ends. This work provides a theoretical basis for the service life expanding and reliability improvement.

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考虑滚刀加工圆角特征的谐波传动空间齿形修正与优化

研究了谐波传动空间齿形的修正与优化，特别是考虑了滚齿加工过程中的圆角特征。工作开始于柔轮的空间变形及其运动轨迹的分析，允许确定一个包络的柔轮齿的运动轨迹。根据滚齿加工工艺特点，提出了一种通过计算该包络与圆花键齿廓啮合点垂直距离的修正值计算方法，得到了保证无干涉啮合的修正值。此外，探讨了将加工圆角特征引入齿形设计，揭示了其对谐波传动应力分布的积极影响。利用有限元模型对谐波传动空间齿形修正优化的有效性进行了评价。有限元仿真结果表明，考虑圆角特征的修正优化能有效地将接触应力重新分布到齿中部，改善齿端应力集中。该工作为延长使用寿命和提高可靠性提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology 工程技术-工程：制造

CiteScore

7.40

自引率

5.60%

发文量

177

审稿时长

46 days

期刊介绍： Precision Engineering - Journal of the International Societies for Precision Engineering and Nanotechnology is devoted to the multidisciplinary study and practice of high accuracy engineering, metrology, and manufacturing. The journal takes an integrated approach to all subjects related to research, design, manufacture, performance validation, and application of high precision machines, instruments, and components, including fundamental and applied research and development in manufacturing processes, fabrication technology, and advanced measurement science. The scope includes precision-engineered systems and supporting metrology over the full range of length scales, from atom-based nanotechnology and advanced lithographic technology to large-scale systems, including optical and radio telescopes and macrometrology.