申请人:Idemitsu Kosan Co., Ltd
公开号:EP3279293A1
公开(公告)日:2018-02-07
Disclosed is a lubricating oil composition satisfying both fuel saving properties and extreme-pressure properties, and having shear stability, oxidation stability and wear resistance, specifically a lubricating oil composition containing a base oil, a viscosity index improver, a molybdenum-based friction modifier, a boron-containing dispersant, and at least two extreme-pressure additives selected from a sulfur-based extreme-pressure additive, a phosphorous-based extreme-pressure additive and a sulfur/phosphorus-based extreme-pressure additive, or a sulfur/phosphorus-based extreme-pressure additive, wherein the base oil is formed of only a synthetic oil, the kinematic viscosity of the base oil at 100°C is 3 mm2/s or more and 10 mm2/s or less, the viscosity index improver is a resin having a number average molecular weight (Mn) of 1,000 or more and 10,000 or less, the mass ratio of the boron atoms (B) contained in the boron-containing dispersant to the molybdenum atoms (Mo) contained in the molybdenum-based friction modifier, [(B)/(Mo)] is 1 or more and 5 or less, and the mass ratio of the sulfur atoms (S) to the phosphorus atoms (P) contained in the extreme-pressure additive(s), [(S)/(P)] is 10 or more and 20 or less.
本发明公开了一种润滑油组合物,该组合物同时满足节油性能和极压性能,并具有剪切稳定性、氧化稳定性和耐磨性,具体而言,该润滑油组合物含有基础油、粘度指数改进剂、钼基摩擦改进剂、含硼分散剂和至少两种极压添加剂,这些极压添加剂选自硫基极压添加剂、磷基极压添加剂和硫/磷极压添加剂、含硼分散剂,以及至少两种极压添加剂,这些添加剂选自硫基极压添加剂、磷基极压添加剂和硫/磷基极压添加剂,或硫/磷基极压添加剂、其中,基础油仅由合成油组成,基础油在 100°C 时的运动粘度为 3 mm2/s 或以上、10 mm2/s 或以下,粘度指数改进剂是一种平均分子量 (Mn) 为 1,000 或以上、10,000 或以下的树脂、含硼分散剂中的硼原子(B)与钼基摩擦改进剂中的钼原子(Mo)的质量比[(B)/(Mo)]为 1 或以上且 5 或以下,极压添加剂中的硫原子(S)与磷原子(P)的质量比[(S)/(P)]为 10 或以上且 20 或以下。