| abstract |
(57) [Abstract] [Purpose] A driving hydraulic lubricating oil composition that can suppress the generation of noise without impairing the frictional characteristics and wear resistance, and in particular, suppresses the formation of precipitates due to the reaction with mixed water. Providing things. [Structure] A lubricating base oil, based on the total amount of the composition, represented by the following general formula (1): (In the formula, R 1 is a hydrocarbon group derived from beef tallow fatty acid, and n is an integer of 2 to 10.) -Alkyl / polyalkylene / diamine and 10 to 10 carbon atoms Salt with carboxylic acid having 20 hydrocarbon groups 0.01 to 5.0% by weight and alkoxy phosphate ester 0.05 A drive hydraulic system lubricating oil composition, characterized in that the lubricating oil composition contains ˜7.0% by weight. |