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The miniature gears have been the key component of the miniature electromechanical devices, and with the widespread application of miniature devices, the demand for miniature gears continues to grow. However, the traditional miniature gears are difficult to overcome the friction and wear caused by relative sliding of the tooth surface. In order to reduce the sliding rate, a novel miniature gear with the contact trace directly designed as a drum-shaped cylindrical helix is proposed, and therefore, the sliding rate and transmission error of the miniature gear can be directly control. Then, the center curve is also obtained. And then, the accurate 3D model of the miniature gear is established through sweeping method in CAD software. To analyze the meshing state of the miniature gear, the tooth contact analysis method based on CAD software is proposed. In the proposed method, the closest point between the driving tooth surface and the driven tooth surface is considered as the contact point, and the contact area can be obtained by solving the intersection curve between the driven tooth surface and the surface obtained by offsetting driving tooth surface at a distance of 6.35 μm. The simulation results showed that the proposed calculation method was feasible. The research results can provide theoretical basis and technical support for the performance calculation and optimization of miniature gears.

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The Design and Tooth Contact Analysis of the Novel Miniature Gears with the Directly Designed Contact Trace and Transmission Ratio Function

  • 会议论文

  • 发表日期：

    2026年

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  • Xiaoping Xiao,
  • Maoxi Zheng,
  • Zhen Chen,
  • Chao He,
  • Weitao He,
  • Yangzhi Chen

摘要

The miniature gears have been the key component of the miniature electromechanical devices, and with the widespread application of miniature devices, the demand for miniature gears continues to grow. However, the traditional miniature gears are difficult to overcome the friction and wear caused by relative sliding of the tooth surface. In order to reduce the sliding rate, a novel miniature gear with the contact trace directly designed as a drum-shaped cylindrical helix is proposed, and therefore, the sliding rate and transmission error of the miniature gear can be directly control. Then, the center curve is also obtained. And then, the accurate 3D model of the miniature gear is established through sweeping method in CAD software. To analyze the meshing state of the miniature gear, the tooth contact analysis method based on CAD software is proposed. In the proposed method, the closest point between the driving tooth surface and the driven tooth surface is considered as the contact point, and the contact area can be obtained by solving the intersection curve between the driven tooth surface and the surface obtained by offsetting driving tooth surface at a distance of 6.35 μm. The simulation results showed that the proposed calculation method was feasible. The research results can provide theoretical basis and technical support for the performance calculation and optimization of miniature gears.