PMA黏指剂在CVTF中的摩擦特性研究

Friction Characteristics of Viscosity Index Improver PMA in CVTF

研究自主研发的聚甲基丙烯酸酯型黏指剂(PMA)在某无级变速箱油(CVTF)中的应用,并与进口同类产品的黏温性能和摩擦特性进行比对测试。结果表明:在改善黏温性能方面,自主研制的PMA-3达到了与进口黏指剂相当的水平;当黏温性能相同时,自主研发的PMA-3的钢-钢摩擦性能与进口产品大致相当,但纸-钢摩擦特性(抗颤耐久性)优于进口剂,说明不同分子结构的PMA会影响CVTF配方体系的抗颤性能,这可能是因为不同分子结构的PMA对CVTF中含P摩擦改进剂与含Ca清净剂间的摩擦化学反应速度影响程度不同,导致在钢盘摩擦表面形成的摩擦膜覆盖率不同,最终使各油样表现出不同的纸-钢摩擦特性。由于纸-钢与钢-钢摩擦试验在摩擦方式和苛刻度方面存在明显差异,会导致P-Ca摩擦膜的成分比例有所不同,需进一步深入探究。

The application of independently developed polymethyl methacrylate type adhesive(PMA)in a continuously variable transmission oil(CVTF)was studied,and the viscosity temperature performance and friction characteristics were compared with imported similar products.The results show that when the viscosity temperature performance is the same,the steel-steel friction performance of the independently developed PMA-3 is roughly equivalent to that of imported similar products,but the paper-steel friction characteristics(anti-shudder durability)are better than the imported agent,indicating that PMA with different molecular structures can affect the anti-shudder performance of the CVTF formula system.This may be due to the varying degrees of influence of PMA with different molecular structures on the frictional chemical reaction rate between P containing friction modifiers and Ca containing detergents in CVTF,resulting in different coverage rates of friction films formed on the friction surface of steel discs,ultimately resulting in different paper steel friction characteristics of each oil sample.Due to significant differences in friction mode and severity scale between paper-steel and steelsteel friction tests,the composition ratio of P-Ca friction film may vary,and further exploration is needed.