润滑油基础油与添加剂对电动汽车传动液导电性能的影响

针对电动汽车电机、减速器、控制器“三合一”集成驱动系统对传动液电气性能提出的新要求，依据液态烃类电导率测定法(ASTM D4308),系统研究了润滑油基础油和添加剂对不同温度下电动汽车传动液电导率的影响。结果表明：随着温度的升高，受油品黏度降低以及载荷迁移速率增大的影响，所有测试油品的电导率均增大；润滑油基础油和抗磨、抗氧、防腐添加剂对传动系统用油的电导率影响较小；清净剂是决定油品电导率的关键组分，高碱值清净剂对电导率的影响大于中、低碱值清净剂；分散剂对油品电导率的影响仅次于清净剂，经硼磷化处理的分散剂电导率高于未经处理的分散剂。

INFLUENCE OF LUBE BASE OIL AND ADDITIVES ON CONDUCTIVITY OF ELECTRIC VEHICLE TRANSMISSION FLUID

In response to the new requirements for the electrical performance of the transmission fluid of electric vehicle motor, reducer, and controller "three-in-one" integrated drive system, the influence of lube base oil and additives on the conductivity of electric vehicle transmission fluid at different temperatures was systematically studied according to the conductivity measurement method of liquid hydrocarbons (ASTM D4308). The results show that with the temperature increases, the conductivity of all test samples increases due to the decrease of oil viscosity and the increase of carrier migration rate; and the influence of lube base oil, anti-wear, anti-oxygen and anti-corrosion additives on the conductivity of transmission fluid is negligible. Detergents play the dominate role on the conductivity of lubricants. Among them, detergents with high total base number (TBN) have significantly greater influence on conductivity than that of medium and low TBN detergents. The dispersant is another key ingredients influence factor on the oil conductivity, and the conductivity of the lubricating oil with dispersant treated by boron and phosphate is the highest than that of others.