Effect of Aged Oils on Ring-Liner Wear

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-07-02 DOI:10.4271/04-13-02-0010

W. Fernandes, E. Tomanik, H. Moreira, T. Cousseau, Giuseppe Pintaude

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引用次数: 6

Abstract

With the trends to increase drain oil interval to reduce cost of ownership of Heavy-Duty vehicles and to use low ash oils, the efficiency of lubricant additives, especially the anti-wear ones, are of great interest. However, most of tribological tests are still done with fresh oils or in a few cases with artificially aged oils. In this work, piston ring and cylinder liner were rig tested for friction and wear on a short reciprocating tester with two oils: a fully formulated SAE 10W-40 API CI-4 / ACEA E7 and a sample of the same oil after 500h of engine test. Liner wear was evaluated by different parameters based on the Bearing Curve. Higher cylinder wear and slight lower friction values were found with aged oil. Samples of a liner with accumulated 500 engine hours were also tested with the aged oil and showed intermediate results. Figure 1Liner wear. After test, wear track of cylinder liners was analyzed by EDS (Energy Dispersive X-Ray Spectrometry) and compared with analyses of the parts before test. Much more Zinc and Phosphorus were found on the liners tested with fresh oil. Figure 2Liner wear and % of Zn+P found in the wear track. CONCLUSIONS: Compared with the fresh oil, the aged oil showed slight lower friction but significant higher liner wear. More Zinc and Phosphorus were found on the liner wear track of the liners tested with the fresh oil. The fresh oil formed more ZZDP derived tribofilms that mitigated liner wear but increase friction. The used liners, tested with the aged oil presented intermediate values of friction, wear and ZDDP tribofilms. REFERENCES [1] Inada, K., Yoshimura, N. “Trends in Specification of Large Diesel Engine Oils”. Idemitsu Tribo review 29, 2016. [2] Rejowski, E. et al. Low viscosity oils impact on heavy duty diesel engine components. Blucher Engineering Proceedings, v. 3, n. 1, p. 118-130, 2016

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老化油对环衬磨损的影响

随着重型汽车为降低拥有成本而增加排油间隔和使用低灰分油的趋势，润滑油添加剂的效率，特别是抗磨添加剂的效率受到人们的关注。然而，大多数摩擦学测试仍然是用新鲜的油或在少数情况下用人工老化的油进行的。在这项工作中，活塞环和缸套在一个短往复式测试机上用两种油进行了摩擦和磨损测试:一种是完全配方的SAE 10W-40 API CI-4 / ACEA E7，另一种是经过500h发动机测试后的同一种油的样品。基于轴承曲线，采用不同参数对衬套磨损进行评估。机油老化后，气缸磨损增大，摩擦值降低。对一个累计500发动机小时的尾管样品也进行了老化油的测试，并显示了中间结果。图1衬套磨损。试验结束后，采用能谱仪(EDS)对气缸套磨损轨迹进行分析，并与试验前零件的分析结果进行对比。在用新油测试的衬垫上发现了更多的锌和磷。图2衬套磨损情况及磨损轨迹中Zn+P含量百分比。结论:与新鲜油相比，陈化油的摩擦系数略有降低，但衬套磨损明显增加。用新油对衬套磨损痕迹进行检测，发现锌和磷含量较高。新油形成了更多的ZZDP衍生摩擦膜，减轻了尾管磨损，但增加了摩擦。用老化油对旧衬套进行摩擦、磨损和ZDDP摩擦膜的测试，结果均为中间值。参考文献[1]Inada, K.， Yoshimura, N.“大型柴油发动机油规格的趋势”。Idemitsu Tribo评论29,2016。[10]雷卓斯基，等。低粘度油对重型柴油机部件的影响。工程机械学报，vol . 3, n. 1, p. 118-130, 2016

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.