Impact of oil ageing on gear scuffing in hybrid dual-clutch transmissions

IF 1.6 3区工程技术 Q3 ENGINEERING, MECHANICAL

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology Pub Date : 2023-10-30 DOI:10.1177/13506501231207126

Wassem Gerges, Oliver Heipl, Marc Wettlaufer, Dirk Bartel

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引用次数: 0

Abstract

As the clutch friction stability in dual-clutch transmissions has been continuously improved over the last decade, wear protection of high loaded mechanical contacts has become increasingly important and mechanical failures have been observed at the end of extended oil drain intervals. A test method was established based on standard equipment already used for transmission fluid development. A modified FZG four-square test rig allows ageing a reduced oil volume to not decelerate development times. Applicability was demonstrated by ageing four full formulated transmission fluids using the new approach and comparing the results to aged transmission fluids sampled from durability testing. The oils aged with the FZG rig exhibit the same characteristics of scuffing load capacity degradation as observed in full transmission systems. However, in the full transmission system, the degradation starts at lower applied specific work, most likely due to the different system complexity. It is pointed out that not only the thermal load but also the tribological stresses have to be considered to mimic oil ageing.

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油龄对混合动力双离合变速器齿轮磨损的影响

近十年来，随着双离合器变速器离合器摩擦稳定性的不断提高，高负荷机械触点的磨损保护变得越来越重要，并且在延长的排油间隔结束时观察到机械故障。基于传动液研制中已使用的标准设备，建立了一种测试方法。改进后的FZG四方测试平台可以减少油量，但不会减慢开发时间。通过使用新方法老化四种完整配方的传动液，并将结果与耐久性测试中取样的老化传动液进行比较，证明了该方法的适用性。在FZG钻机上老化的油表现出与在全传动系统中观察到的磨损载荷能力下降相同的特征。然而，在全传动系统中，由于不同的系统复杂性，退化从较低的应用比功开始。指出模拟油液老化不仅要考虑热载荷，而且要考虑摩擦学应力。

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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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 工程技术-工程：机械

CiteScore

4.20

自引率

5.00%

发文量

110

审稿时长

6.1 months

期刊介绍： The Journal of Engineering Tribology publishes high-quality, peer-reviewed papers from academia and industry worldwide on the engineering science associated with tribology and its applications. "I am proud to say that I have been part of the tribology research community for almost 20 years. That community has always seemed to me to be highly active, progressive, and closely knit. The conferences are well attended and are characterised by a warmth and friendliness that transcends national boundaries. I see Part J as being an important part of that community, giving us an outlet to publish and promote our scholarly activities. I very much look forward to my term of office as editor of your Journal. I hope you will continue to submit papers, help out with reviewing, and most importantly to read and talk about the work you will find there." Professor Rob Dwyer-Joyce, Sheffield University, UK This journal is a member of the Committee on Publication Ethics (COPE).