| 主权项 |
1. A method for lubricating a driveline device comprising supplying to the driveline device a lubricating composition comprising an oil of lubricating viscosity and an antiwear package wherein the antiwear package comprises
(a) 0.01 wt % to 3 wt % of a derivative of a hydroxycarboxylic acid, wherein the derivative of a hydroxycarboxylic acid is represented by the formula:whereinn=2, m=1, orn and m both equal 2, orn=3, m=1;X is an aliphatic or alicyclic group, or an aliphatic or alicyclic group containing an oxygen atom in the carbon chain, or a substituted group of the foregoing types, said group containing up to 6 carbon atoms and having n+m available points of attachment;each Y is independently —O—; andeach R and R1 are independently hydrogen or a hydrocarbyl group, provided that at least one R or R1 group is a hydrocarbyl group; each R2 is independently hydrogen, a hydrocarbyl group or an acyl group, further provided that at least one —OR2 group is located on a carbon atom within X that is α or β to at least one of the —C(O)—Y—R groups, and
(b) 0.05 wt % to 2 wt % of a phosphorus compound, wherein the phosphorus compound is an amine salt of a phosphate hydrocarbon ester represented by the formula:whereinR3 and R4 are independently hydrogen or hydrocarbon containing 8 to 18 carbon atoms, with the proviso that at least one is a hydrocarbon group; and
R5, R6, R7 and R8 independently hydrogen or a hydrocarbyl group, with the proviso that at least one is a hydrocarbyl group. |
