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<p>The differences in dynamic characteristics among various types of worm drives are not yet clarified. This study comparatively analyzes the dynamic behaviors of three typical worm drives—point contact, line contact along the tooth width, and line contact along the tooth height—using nylon-steel gear pairs. The tooth surface equations of worm drives are derived based on the conjugate relationship, and the mesh stiffness is calculated using the equivalent rectangle method and slicing method. An eight-degree-of-freedom dynamic model, incorporating time-varying mesh stiffness and damping, is established for the three types of worm drives. Through numerical simulations and experimental validations on nylon-steel pairs, the differences in vibration behavior among them are compared and analyzed. The results indicate that the contact form is the primary factor influencing the amplitude and fluctuation of vibrations. Additionally, regardless of the contact form, the axial vibration response of the worm exhibits the largest magnitude. These findings provide essential insights for the design and optimization of worm drives, particularly in applications involving polymer-metal material combinations.</p>

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Study on the vibration characteristics of worm drive with different contact forms

  • 期刊论文

  • 发表日期：

    2025年3月14日

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  • Fei Liu,
  • Yonghong Chen,
  • Lin Bo,
  • Diao Chen,
  • Wenjun Luo,
  • Bingkui Chen

摘要

The differences in dynamic characteristics among various types of worm drives are not yet clarified. This study comparatively analyzes the dynamic behaviors of three typical worm drives—point contact, line contact along the tooth width, and line contact along the tooth height—using nylon-steel gear pairs. The tooth surface equations of worm drives are derived based on the conjugate relationship, and the mesh stiffness is calculated using the equivalent rectangle method and slicing method. An eight-degree-of-freedom dynamic model, incorporating time-varying mesh stiffness and damping, is established for the three types of worm drives. Through numerical simulations and experimental validations on nylon-steel pairs, the differences in vibration behavior among them are compared and analyzed. The results indicate that the contact form is the primary factor influencing the amplitude and fluctuation of vibrations. Additionally, regardless of the contact form, the axial vibration response of the worm exhibits the largest magnitude. These findings provide essential insights for the design and optimization of worm drives, particularly in applications involving polymer-metal material combinations.