Double helical gears are widely applied in the aviation, marine and energy equipment, and generally required to be modified as the crowned since the machining error and assembling error of the gear drive are inevitable. The crowned gears usually operate in point contact mixed elastohydrodynamic lubrication (EHL), and adhesive wear has been one of the most prominent problems, but few previous researches were focused on this problem. In this work, a wear life prediction model of crowned double helical gears in point contact mixed EHL is proposed. The tooth profiles of the crowned gears are obtained according to the generating principle, and the load is attained in consideration of multi-tooth pairs contact. The contact pressure is derived from Hertzian elastic contact theory and load sharing concept, and the sliding distance is determined by a generalized model. Then, the wear rate in point contact mixed EHL is evaluated by extending the Archard theory to lubricated case, and the extended Archard's wear model is used to formulate the gear tooth wear. Moreover, the wear life prediction model which takes account of rotation speed and input torque is established, and the influences of surface roughness and crowned amount on the wear life of the crowned gears are further studied. Results show that surface roughness has a great influence on the wear life at different rotational speeds, while input torque has a great influence on the wear life at different crowned amount. It indicates that the wear life of the crowned double helical gears can be improved by reasonable matching lubrication, modification and working parameters.

双斜齿轮广泛应用于航空、船舶和能源设备，由于齿轮传动装置的加工误差和装配误差不可避免，因此一般需要进行加冠改装。冠状齿轮通常在点接触混合弹性流体动力润滑（EHL）下运行，粘着磨损一直是最突出的问题之一，但以前的研究很少关注这个问题。在这项工作中，提出了点接触混合 EHL 中冠状双斜齿轮的磨损寿命预测模型。冠状齿轮的齿廓是根据发生原理得到的，载荷是考虑多齿对接触的。接触压力源自赫兹弹性接触理论和负载分担概念，滑动距离由广义模型确定。然后，通过将Archard理论扩展到润滑情况来评估点接触混合EHL的磨损率，并使用扩展的Archard磨损模型来制定轮齿磨损。此外，建立了考虑转速和输入扭矩的磨损寿命预测模型，进一步研究了表面粗糙度和凸度对冠状齿轮磨损寿命的影响。结果表明，表面粗糙度对不同转速下的磨损寿命影响较大，而输入扭矩对不同凸度下的磨损寿命影响较大。这表明通过合理匹配润滑、修整和工作参数可以提高冠状双斜齿轮的磨损寿命。通过将 Archard 理论扩展到润滑情况来评估点接触混合 EHL 中的磨损率，并使用扩展的 Archard 磨损模型来制定轮齿磨损。此外，建立了考虑转速和输入扭矩的磨损寿命预测模型，进一步研究了表面粗糙度和凸度对冠状齿轮磨损寿命的影响。结果表明，表面粗糙度对不同转速下的磨损寿命影响较大，而输入扭矩对不同凸度下的磨损寿命影响较大。这表明通过合理匹配润滑、修整和工作参数可以提高冠状双斜齿轮的磨损寿命。通过将 Archard 理论扩展到润滑情况来评估点接触混合 EHL 中的磨损率，并使用扩展的 Archard 磨损模型来制定轮齿磨损。此外，建立了考虑转速和输入扭矩的磨损寿命预测模型，进一步研究了表面粗糙度和凸度对冠状齿轮磨损寿命的影响。结果表明，表面粗糙度对不同转速下的磨损寿命影响较大，而输入扭矩对不同凸度下的磨损寿命影响较大。这表明通过合理匹配润滑、修整和工作参数可以提高冠状双斜齿轮的磨损寿命。