Influence of Additives Concentration on the Electrical Properties and the Tribological Behaviour of Three Automatic Transmission Fluids

被引:15
作者
Garcia Tuero, Alejandro [1 ]
Rivera, Noelia [2 ]
Rodriguez, Eduardo [1 ]
Fernandez-Gonzalez, Alfonso [3 ]
Viesca Luis, Jose [1 ]
Hernandez Battez, Antolin [1 ]
机构
[1] Univ Oviedo, Dept Construct & Mfg Engn, Pedro Puig Adam s-n, Gijon 33203, Spain
[2] Univ Oviedo, Dept Marine Sci & Technol, Blasco Garay s-n, Gijon 33203, Spain
[3] Univ Oviedo, Dept Phys & Analyt Chem, Julian Claveria 8, Oviedo 33006, Spain
关键词
electric vehicles; automatic transmission fluid; electrical properties; additives; friction; wear; BOUNDARY LUBRICATION; PROPYLENE CARBONATE; PERFORMANCE;
D O I
10.3390/lubricants10110276
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Placing an electric motor (EM) inside the transmission housing of a hybrid electric vehicle (HEV) implies that the automatic transmission fluid (ATF) needs to accomplish additional requirements. Among these requirements, electrical compatibility is of critical significance. This study investigated the influences of the additive concentrations of three commercial ATFs on their electrical compatibilities and tribological performances. Two variations of each ATF with different concentrations of the original additive packages were prepared. The viscosity, electrical conductivity, permittivity, resistivity, dielectric dissipation factor, breakdown voltage, and tribological performance of the nine resulting ATFs were measured. All the ATFs were found to be electrically compatible and showed dissipative performance and sufficiently high breakdown voltage, even at increasing additive concentrations. The tribological performances of the ATFs formulated with the API (American Petroleum Institute) Group III base oils had improved wear reduction at the highest additive concentrations; the better wear performance was related to the formation of iron phosphates and polyphosphates on the worn surface.
引用
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页数:18
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