[Problem to be Solved]
To provide a lubricating oil composition capable of having a good balance of electrical insulation, seizure resistance and wear resistance.
[Means to Solve the Problem]
The lubricating oil composition according to the present invention comprises:
(A) a lubricant base oil;
(B) an alkaline earth metal detergent, wherein the amount of the alkaline earth metal is 10 ppm or more by mass and 1000 ppm or less by mass on the basis of the total amount of the lubricating oil composition;
(C) 0.005% or more by mass and 0.90% or less by mass of a triazole-based compound represented by the following general formula (1) or (2), on the basis of the total amount of the lubricating oil composition:
wherein R1 is a hydrogen atom or a methyl group, and R2 and R3 are each independently a hydrogen atom or a linear or branched hydrocarbon having 1 to 18 carbons,
wherein R4 is a hydrogen atom or a methyl group, and R5 and R6 are each independently a hydrogen atom or a linear or branched hydrocarbon having 1 to 18 carbons;
(D) at least one sulfur-containing compound selected from the group consisting of a sulfur-containing heterocyclic ether compound and a sulfide compound, wherein the amount of sulfur is 10 ppm or more by mass and 2000 ppm or less by mass, on the basis of the total amount of the lubricating oil composition; and
(E) 0.010% or more by mass and 4.0% or less by mass of an ashless dispersant on the basis of the total amount of the lubricating oil composition.
[有待解决的问题]
提供一种润滑油组合物,该组合物能够很好地兼顾电气绝缘性、抗咬合性和耐磨性。
[解决问题的方法]
根据本发明的润滑油组合物包括
(A) 润滑油基础油;
(B) 碱土
金属清洁剂,其中碱土
金属的含量为 10 ppm 或以上(以质量计),1000 ppm 或以下(以质量计)(以润滑油组合物总量为基础);
(C) 以下通式(1)或(2)代表的三唑类化合物,其质量百分比为 0.005% 或以上,质量百分比为 0.90% 或以下,以润滑油组合物的总量为基础:
其中 R1 是氢原子或甲基,R2 和 R3 各自独立地为氢原子或具有 1 至 18 个碳原子的直链或支链烃、
其中 R4 是氢原子或甲基,R5 和 R6 各自独立地是氢原子或碳原子数为 1 至 18 个的直链或支链烃;
(D) 至少一种
含硫化合物,选自由含
硫杂
环醚化合物和
硫化物化合物组成的组,其中以润滑油组合物的总量为基准,
硫含量为 10 ppm 或以上(以质量计)和 2000 ppm 或以下(以质量计);以及
(E) 以润滑油组合物总量为基准,0.010%或以上(以质量计)和 4.0% 或以下(以质量计)的无灰分散剂。