申请人:Nippon Oil Corporation
公开号:EP1598412A1
公开(公告)日:2005-11-23
A lubricating oil composition for transmissions comprises a lubricating base oil comprising (A) a lubricating base oil so adjusted to have a kinematic viscosity at 100°C of from 1.5 to 5 mm2/s and a %CN of from 10 to 60 (B) a mineral lubricating base oil having a kinematic viscosity at 100°C of from 10 to 50 mm2/s and a sulfur content of from 0.3 to 1 percent by mass and (C) a synthetic oil composed of carbon and hydrogen and having a number average molecular weight of from 2,000 to 20,000, in respective specific amounts and (D) an extreme pressure additive of from 0.05 to 2 percent by mass, based on the total amount of the composition, of comprising a phosphorus-based extreme pressure additive, a sulfur-based extreme pressure additive and/or a phosphorus-sulfur-based extreme pressure additive, wherein in the composition, the phosphorus content (P) is from 0.01 to 0.05 percent by mass, the total sulfur content (S) is from 0.05 to 0.3 percent by mass, and the P/S ratio is from 0.10 to 0.40. The lubricating oil composition has both excellent fuel economy performance and satisfactory durability for gears and bearings and furthermore excellent low temperature viscosity and oxidation stability.
一种用于变速器的润滑油组合物包括一种润滑基础油,该基础油包括 (A) 一种润滑基础油,该基础油经过调整,在 100°C 时的运动粘度为 1.5 至 5 mm2/s,CN%为 10 至 60 (B) 一种矿物润滑基础油,该基础油在 100°C 时的运动粘度为 10 至 50 mm2/s,硫含量为 0.(C) 由碳和氢组成、平均分子量为 2,000 至 20,000 的合成油,其具体用量分别为 (D) 极压添加剂,其质量百分比为 0.其中包括磷基极压添加剂、硫基极压添加剂和/或磷硫基极压添加剂,在该组合物中,磷含量 (P) 为 0.01 至 0.05%(质量百分比),总硫含量 (S) 为 0.05 至 0.3%(质量百分比),P/S 比为 0.10 至 0.40。该润滑油组合物既具有出色的燃油经济性,又具有令人满意的齿轮和轴承耐久性,还具有出色的低温粘度和氧化稳定性。