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Development of a test method to evaluate the life of gear oils for heavy-duty vehicles
Technical Paper
2003-01-1997
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In consideration of environmental protection, it has recently become necessary to extend the drain intervals of gear oils. For the evaluation of oil life, field tests are generally used, but they are extremely time-consuming and expensive. For gear oils, a laboratory evaluation method mutually related to in-vehicle life has not yet been presented in papers. Because of the importance of evaluating the life of developing oils, the goal of this study was to establish a laboratory evaluation method mutually related to in-vehicle deterioration. With this method, appropriate evaluation is carried out easily and quickly. In our research, we used an FZG gear machine (power circulating gear test rig) to test for T/M (transmission) oil deterioration. The FZG gear machine was operated under severe conditions to accelerate the deterioration of the oil. We also used TAN (total acid number) and LCC (load-carrying capacity) as oil evaluation criteria for determining the details of the oil deterioration process. Also, NMR (nuclear magnetic resonance) spectroscopy was used to identify the deterioration process of additives.
The results of the FZG test were similar to those of the field test with respect to oil deterioration. Also, the NMR analysis showed that the deterioration process of ZnDTP in the FZG tests and the field tests were similar. Therefore, the FZG test method can be used as a means to deteriorate T/M oils.
The results of the FZG tests indicate that the life of synthetic-based T/M oil is at least twice as long as that of mineral-based oil.
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Matsumoto, K., Yamakawa, S., Yamamoto, H., Yamada, Y. et al., "Development of a test method to evaluate the life of gear oils for heavy-duty vehicles," SAE Technical Paper 2003-01-1997, 2003, https://doi.org/10.4271/2003-01-1997.Also In
References
- Hansel T.J. Mullins W.W. Zakarian J.A. Buitrago J.A. “Comparison of Extended Service Lubricants for Heavy-duty Transmissions and Axles,” SAE Paper 2001-01-3595
- Salentine C.G. “Results of a 500,000-Mile Field Test of a Gear Lubricant in Heavy-duty Manual Transmissions,” SAE Paper 912408
- Salentine C.G. “Long-Term, Heavy-Duty Field Test Comparison of Four GL-5 Gear Lubricants,” SAE Paper 900811
- Yagishita K. Igarashi J. “ 31 P-NMR and Mass Spectrometric Studies of the Reaction of Zinc Dialkyldithiophosphates with Cumen Hydroperoxide (Part 1) Kinetics and Mechanisms of the Initial Homolytic Reaction,” Sekiyu Gakkaishi (J. Japan Petroleum Institute) 38 6 374 1995
- Yagishita K. Igarashi J. “ 31 P-NMR and Mass Spectrometric Studies of the Reaction of Zinc Dialkyldithiophosphates with Cumen Hydroperoxide (Part 2),” Sekiyu Seihin Touronkai Yokousyu C-18 1995
- Yagishita K. Igarashi J. “The type analysis of the phosphorus type addition agent in lubricating oil by 31 P-NMR,” Sekiyu Seihin Touronkai Yokousyu 80 1994
- Peng Pu Hong Shan-Zhen Lu Wan-Zhen “The Degradation of Zinc Dialkyldithiophospate Additive in Fully Formulated Engine Oil as Studied by P-31 NMR Spectroscopy,” Lubrication Engineering 50 3 230 235