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<p>In differential gear systems, low reduction ratio (LRR) face gear drives are frequently overlooked because of the severe edge contact problems and the loss of meshing features in the toe region. This study presents a combination of pinion tooth crowning modification and the development of a mixed elastohydrodynamic lubrication (EHL) wear model in order to enhance and evaluate the contact performance of LRR face gear drives. The bearing contact is localized by the longitudinal crowning of the pinion tooth surface, where the pinion and shaper have the same number of teeth. Simultaneously, by analyzing gear meshing characteristics and integrating the sliding wear law with EHL theory while taking rough surfaces into consideration, the EHL wear model is established. Lubrication and wear analyses at two critical meshing points under the ISO 6336 standard show that modification parameters and the pinion's axial mounting position affect lubrication and sliding wear. Specifically, increasing the modification radius or reducing the axial mounting distance of the pinion can improve lubrication performance, thus providing an effective solution for the contact issues of LRR face gear pairs.</p>

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Evaluation of contact characteristics for geometric modified low reduction ratio face gear pairs under mixed lubrication

  • 期刊论文

  • 发表日期：

    2025年5月15日

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  • Wei Sheng,
  • Zhengminqing Li,
  • Xiaofeng Yu,
  • Rongsheng Xi

摘要

In differential gear systems, low reduction ratio (LRR) face gear drives are frequently overlooked because of the severe edge contact problems and the loss of meshing features in the toe region. This study presents a combination of pinion tooth crowning modification and the development of a mixed elastohydrodynamic lubrication (EHL) wear model in order to enhance and evaluate the contact performance of LRR face gear drives. The bearing contact is localized by the longitudinal crowning of the pinion tooth surface, where the pinion and shaper have the same number of teeth. Simultaneously, by analyzing gear meshing characteristics and integrating the sliding wear law with EHL theory while taking rough surfaces into consideration, the EHL wear model is established. Lubrication and wear analyses at two critical meshing points under the ISO 6336 standard show that modification parameters and the pinion's axial mounting position affect lubrication and sliding wear. Specifically, increasing the modification radius or reducing the axial mounting distance of the pinion can improve lubrication performance, thus providing an effective solution for the contact issues of LRR face gear pairs.