| 摘要 |
PURPOSE: A lubricating oil composition for a shock absorber is provided to improve a property of maintaining initial ride comfort for a long time by reducing the change of initial friction coefficient value and friction coefficient value after a constant time. CONSTITUTION: A lubricating oil composition for a shock absorber contains 0.05~0.3wt% of polyalkenyl succinimide marked as chemical formula 1 or 2 for a friction adjustor, and 0.3~1.5wt% of alkyl phosphoric acid ester amine salt marked as chemical formula 3 by the total weight of the lubricating oil composition. In the chemical formula 1, R1 is an olefin oligomer with an average molecular weight or 2,000~3,000. R2 refers to an alkylene radical with the carbon number of 2~4. In the chemical formula 2, R3 and R4 are the olefin oligomers with the average molecular weight or 2,000~3,000. In the chemical formula 3, R7 and R8 refer to alkyl group or arkenyl group with the hydrogen or the carbon number of 10~20.
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