Abstract Earlier studies have shown that the load-dependent friction behavior of various gear oils can affect their pitting performance; that is, low friction resulted in a long pitting life. These studies were limited, however, to test methods and running conditions quite different from those occurring in actual gear transmissions. In the present study, a more gear-like twin-disc machine with test specimens and running conditions relevant for gear contacts was used to investigate whether the same trends could be found. To analyze this possible correlation, the first step was to prepare a set of hypoid gear oils and to test their friction performance to compare various ways of improving friction behavior but also to form an understanding of why their friction performance varied. The second step was to test the pitting performance of the oils. The pitting results could then be compared to the friction properties of the oils to analyze the correlation. Other possible mechanisms behind the formation of pits are also discussed. The results show that for the oils included, the antiwear and extreme-pressure additive package and the base oil type affect friction. The results further show that additive combinations and/or base oils that result in low friction lead to enhanced pitting performance.

中文翻译：

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通过减少摩擦改善双曲面齿轮油点性能

摘要 早期研究表明，各种齿轮油的负载相关摩擦行为会影响其点蚀性能；也就是说，低摩擦导致长点蚀寿命。然而，这些研究仅限于测试方法和运行条件与实际齿轮传动中发生的情况大不相同。在本研究中，使用带有测试样本和与齿轮接触相关的运行条件的更像齿轮的双盘机器来研究是否可以找到相同的趋势。为了分析这种可能的相关性，第一步是准备一组准双曲面齿轮油并测试它们的摩擦性能，以比较各种改善摩擦行为的方法，同时了解它们的摩擦性能为何会发生变化。第二步是测试油的点蚀性能。然后可以将点蚀结果与油的摩擦特性进行比较以分析相关性。还讨论了坑形成背后的其他可能机制。结果表明，对于所包含的油，抗磨极压添加剂包和基础油类型对摩擦有影响。结果进一步表明导致低摩擦的添加剂组合和/或基础油导致增强的点蚀性能。