Xinyu Lv1, Yanqiang Sun1,2,3This email address is being protected from spambots. You need JavaScript enabled to view it., Guiping Xie2, Huiming Cheng4, and Lingyan Zhao1
1School of Construction Machinery, Shandong Jiaotong University, Jinan 250357, China
2Zhejiang Xiaxia Precision Manufacturing Co., Ltd, Ningbo 315202, China
3School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471000, China
4Beijing Engineering Research Center of Precision Measurement Technology and Instruments, Beijing University of Technology, Beijing 100124, China
Received: October 18, 2025 Accepted: January 18, 2026 Publication Date: February 4, 2026
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
The transmission performance of the inverted planetary roller screw mechanism (IPRSM) is affected by non uniform load distribution on the thread tooth. This phenomenon often leads to stress concentration at the load-bearing areas of the thread tooth, thereby causing fatigue failure. To address this issue, K-type modification of thread tooth is proposed to optimize the load distribution on the IPRSM. The effects of different modification coefficients and inclination angles on the relative optimal modification amount are analyzed. The contact stress distributions are determined through theoretical mechanical analysis and finite element modeling, before and after modification. Comparative results demonstrate that K-type modification suppresses maximum contact stress on the first meshing thread tooth at the load input end. For a positive K-type modification of 0.16 mm, the maximum stress is reduced by 18.1% relative to the unmodified condition. Similarly, a 21.3% reduction in maximum stress is achieved via a reverse K-type modification of 0.14 mm. In addition, the effects of different modification coefficients and inclination angles on the load distribution are small for the relatively optimal modification amount. This work provides an approach for load distribution design in IPRSM, offering a theoretical framework and practical guidance for enhancing transmission performance.
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