An approach for estimating the reliability of transmission oils

C. Maisch, B. Bertsche, B. Hohn, H. Otto
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Abstract

This paper deals with an approach for estimating the reliability of transmission oils. Forecasting oil degradation, especially oil oxidation allows to adjust the right oil change intervals in order to save costs and expand the transmission's lifetime. A brief overview about the machine component transmission oil imparts fundamental knowledge. Afterwards definitions of oil failures and combining them to an oil failure system are explained. The oil lifetime line describes the relationship between possible oil temperature and oil lifetime. Such a line is the keystone in order to describe the oil's failure behavior caused by oil oxidation. That's why two approaches are presented to derive an oil lifetime line. Both approaches use a certain oil failure criteria explained in the paper. The first approach is based on the pitting damage accumulation hypothesis. This hypothesis is expanded with the effect of oil degradation what enables to derive an oil lifetime line out of the results of a back-to-back spur gear rig test. Second a General Log Linear Model is used with available data to estimate the gears pitting lifetime depending on oil degradation. With the defined oil failure criteria it was possible to derive an oil lifetime line for mineral oil based fluids. Further work will include the estimation of an oil lifetime line with a probability and confidence intervals. Synthetic oil based fluids need to be investigated more intensive in order to create a suitable oil lifetime line for such fluids.
一种估计传动油可靠性的方法
本文讨论了一种评估传动油可靠性的方法。预测油的降解,特别是油的氧化,可以调整正确的换油间隔,以节省成本并延长变速器的使用寿命。简要介绍机器部件传动油的基本知识。然后解释了油故障的定义以及将它们结合到一个油故障系统中。油寿命线描述了可能的油温与油寿命之间的关系。这条线是描述油品氧化失效行为的关键。这就是为什么提出了两种方法来推导油的寿命线。这两种方法都使用了文中解释的一定的油失效准则。第一种方法基于点蚀损伤累积假说。这一假设在油退化的影响下得到了扩展,这使得从背靠背正齿轮钻机试验的结果中得出了油的寿命线。其次,利用一般对数线性模型和现有数据估计齿轮的点蚀寿命取决于油的退化。根据确定的油失效标准,可以推导出矿物油基流体的油寿命线。进一步的工作将包括用概率和置信区间估计油的寿命线。需要对合成油基流体进行更深入的研究,以便为此类流体制定合适的油寿命线。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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