| 摘要 |
The invention relates to a method for improving the peeling protection properties of lubricant compositions for transmissions, containing sulphur and phosphosulphur compounds, including a step in which compounds (c) are added to the initial transmission lubricant composition, said compounds (c) reducing the active sulphur content of the end composition by at least 5%, measured using the ASTM D1662 standard. The invention also relates to a lubricant composition containing: (a) 60 - 90 wt.-% of one or more base oils of mineral, synthetic or natural origin; (b) at least one extreme-pressure anti-wear phosphorus or phosphosulphur additive; and (c) at least one extreme-pressure anti-wear sulphur additive. According to the invention, the ratio S/P of the sulphur element content (measured using ASTM D2622) to the phosphorus element content (measured using ASTM D5185) of the lubricant composition is between 20 and 40 and preferably between 25 and 35 and the ratio Sactive/S of the active sulphur content at 150°C (measured using ASTM D1662) and the sulphur element content (measured using ASTM D5185) of the lubricant composition is less than 0.34 and preferably less than 0.33. |
