The invention provides a lubricant composition for automatic transmissions excellent in sustainability of anti-shudder property, low-temperature viscosity characteristics, and oxidation stability, and excellent and well-balanced in durability of friction characteristics, energy-conserving performance, and anti-fatigue performance on gears. The composition contains a base oil having a kinematic viscosity at 100 °C of 3.7-4.1 mm2/s, and composed of base oil having the viscosityof 2.5-4.5 mm2/s, and base oil having the viscosity of 10-40 mm2/s; 1-20 mass% poly(meth)acrylate viscosity index improver having Mw of 15000-30000; 2-4 mass% imide friction modifier having a C8-C30 hydrocarbon group; 0.01-0.04 mass% phosphorus extreme pressure agent in terms of phosphorus; and 0.01-0.04 mass% ashless dispersant having at least one alkyl or alkenyl group of a number average molecular weight of ≥2000 in terms of nitrogen, all with respect to the total amount of the composition, and has the viscosity of 5.6-5.8 mm2/s.
本发明提供了一种用于自动变速器的润滑油组合物,该组合物在抗抖动性、低温粘度特性和氧化稳定性方面具有优异的持续性,并且在摩擦特性的耐久性、节能性能和齿轮抗疲劳性能方面具有优异且均衡的表现。该组合物包含 100 °C 运动粘度为 3.7-4.1 mm2/s 的基础油,由粘度为 2.5-4.5 mm2/s 的基础油和粘度为 10-40 mm2/s 的基础油组成;1-20 质量%的聚(甲基)
丙烯酸酯粘度指数改进剂,其 Mw 为 15000-30000;2-4 质量%的具有 C8-C30 碳氢基团的
酰亚胺摩擦改进剂;0.0.01-0.04质量%的
磷极压剂;以及0.01-0.04质量%的无灰分散剂,其至少具有一个平均分子量≥2000的烷基或烯基(以氮计),所有这些相对于组合物的总量而言,其粘度为5.6-5.8 mm2/s。