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<p>The inverted planetary roller screw mechanism (IPRSM) with high precision and load-carrying capability is designed to achieve the transformation from rotary motion into linear motion. However, non-uniform load distribution on the thread tooth can affect transmission accuracy and fatigue life. To address this issue, three modification methods are proposed to optimize load distribution in the IPRSM. The first method involves the clearance adjustment of the thread tooth in the screw-roller pair. The second method modifies the thread tooth top of the screw using linear, K-type, and reverse K-type modifications. The third method focuses on modifying the thread tooth arc with concave arc modifications of the screw and convex arc modifications of the roller. Finite element analysis (FEA) is conducted to compare load distribution for each method. Results reveal that the clearance adjustment of the thread tooth in the screw-roller pair has minimal effect on optimizing load distribution. on the contrary, the other two methods show significant improvement. A 27.7% reduction is observed with reverse K-type modification at 0.15&#xa0;mm. The concave arc modification of the screw achieves a 49.1% reduction in stress at an arc radius of 9.2&#xa0;mm. This work will provide a theoretical guidance for the optimization design of the IPRSM.</p>

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Thread tooth modifications for optimizing load distribution in the inverted planetary roller screw mechanism

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Xinyu Lv,
  • Yanqiang Sun,
  • Guiping Xie,
  • Huiming Cheng,
  • Ruijie Gu,
  • Lingyan Zhao

摘要

The inverted planetary roller screw mechanism (IPRSM) with high precision and load-carrying capability is designed to achieve the transformation from rotary motion into linear motion. However, non-uniform load distribution on the thread tooth can affect transmission accuracy and fatigue life. To address this issue, three modification methods are proposed to optimize load distribution in the IPRSM. The first method involves the clearance adjustment of the thread tooth in the screw-roller pair. The second method modifies the thread tooth top of the screw using linear, K-type, and reverse K-type modifications. The third method focuses on modifying the thread tooth arc with concave arc modifications of the screw and convex arc modifications of the roller. Finite element analysis (FEA) is conducted to compare load distribution for each method. Results reveal that the clearance adjustment of the thread tooth in the screw-roller pair has minimal effect on optimizing load distribution. on the contrary, the other two methods show significant improvement. A 27.7% reduction is observed with reverse K-type modification at 0.15 mm. The concave arc modification of the screw achieves a 49.1% reduction in stress at an arc radius of 9.2 mm. This work will provide a theoretical guidance for the optimization design of the IPRSM.