Phosphorylated dispersants in fluids for electric vehicles
AssigneeAfton Chemical Corporation
InventorsTsuneo Adachi, Lesley Schmid, Hideaki Mitsui, Christopher Cleveland, Atanu Adhvaryu
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Abstract
The present disclosure relates to a lubricating fluid for an electric motor system and a method of lubricating gears and cooling a motor in an electric motor system. In particular, the disclosed technology relates to a lubricating fluid, for use in electric motor vehicle, comprising an oil of lubricating viscosity and at least one phosphorylated dispersant exhibiting increased resistivity after aging.
Claims18
A lubricating composition for use in an electric vehicle comprising:
- at least 95 weight percent of a lubricating base oil composition, the lubricating base oil composition including base oil selected from API Group III base oils or blends of Group III base oils with Group II, Group V base oils or mixtures thereof;
- a phosphorylated succinimide dispersant containing 2 wt % to 3.5 wt % phosphorus, the phosphorylated succinimide dispersant providing 100 ppm to 650 ppm phosphorus to the lubricating composition;
- the lubricating composition having 700 ppm or less total phosphorus and the phosphorylated succinimide dispersant provides at least 70% of the total phosphorus;
- and
- wherein the lubricating composition has a kinematic viscosity from 3 cSt to 6.5 cSt at 100° C. and has a resistivity of at least 50 M Ω·m, as measured according to ASTM D2624-15 using the lubricating composition at 1.5 volts and at 30° C., after the fluid has been aged according to JIS K2514-1 at 150° C., wherein the lubricating composition has no more than 31 ppm of copper after 120 hours at 150° C. pursuant to ASTM D130-18, and wherein the lubricating composition exhibits a 4-ball wear scar of no more than 0.68 mm pursuant to ASTM D4172;
- wherein if the lubricating base oil composition comprises API Group V base oil, the API Group V base oil is present in an amount up to 15 wt % based on the total lubricating composition;
- wherein if the lubricating base oil composition comprises API Group II base oil, the API Group II is present in an amount up to 80 wt % based on the total lubricating composition.
A method of improving electrical resistivity of a lubricating composition in an electric vehicle comprising providing to an electric vehicle powertrain a lubricating oil having a composition comprising:
- at least 95 weight percent of a lubricating base oil composition, the lubricating base oil composition comprising base oil selected from API Group III base oils or blends of API Group III base oils with API Group II, API Group V base oils, or mixtures thereof;
- a phosphorylated succinimide dispersant containing 2 wt % to 3.5 wt % phosphorus, the phosphorylated succinimide dispersant providing 100 ppm to 650 ppm phosphorus to the lubricating composition;
- the lubricating composition having 700 ppm or less phosphorus and the phosphorylated succinimide dispersant provides at least 70% of the total phosphorus;
- and
- wherein the lubricating oil has a kinematic viscosity from 3 cSt to 6.5 cSt at 100° C. and has a resistivity of at least 50 M Ω·m, as measured according to ASTM D2624-15 using the lubricating composition at 1.5 volts and at 30° C., after the fluid has been aged according to JIS K2514-1 at 150° C., wherein the lubricating composition has no more than 31 ppm of copper after 120 hours at 150° C. pursuant to ASTM D130-18, and wherein the lubricating composition exhibits a 4-ball wear scar of no more than 0.68 mm pursuant to ASTM D4172;
- and
- wherein if the lubricating base oil composition comprises API Group V base oil, the API Group V base oil is present in an amount up to 15 wt % based on the total lubricating composition;
- wherein if the lubricating base oil composition comprises API Group II base oil, the API Group II is present in an amount up to 80 wt % based on the total lubricating composition.
Dependencies are inferred from the claim text.