Abstract:
This disclosure relates to a method for preventing or minimizing electrostatic discharge and dielectric breakdown in an electric vehicle powertrain by controlling electrical conductivity over a lifetime of a lubricating oil in an electric vehicle powertrain lubricated with the lubricating oil. The lubricating oil has a composition including a lubricating oil base stock as a major component, and an additive package as a minor component comprising one or more lubricating oil additives, and an effective amount of one or more conductivity agents, as a minor component. The lubricating oil has an electrical conductivity from 10 pS/m to 20,000 pS/m, a dielectric constant of 1.6 to 3.6, with a ratio of electrical conductivity-to-dielectric constant from 1,000 to 10,000. Also provided are methods for obtaining a desired electrical conductivity -to-dielectric constant ratio of a lubricating oil for an electric powertrain and powertrain components and methods for lubricating an electric vehicle powertrain and powertrain components.
Abstract:
An oil composition useful as a high stress electrical oil and especially as a transformer load tap changer oil is provided. The composition comprises a major amount of a paraffinic oil having a low viscosity of less than about 20 cSt @ 40 DEG C and an effective amount of an additive system including at least one hindered phenolic antioxidant and a benzotriazole metal deactivator.
Abstract:
This disclosure describes a lubricant additive. The additive is a friction modifier that includes a molybdenum containing compound and a tertiary amine-containing composition having the structure (I), wherein each R1 and R5 is independently a linear or branched-chain monovalent hydrocarbyl group having one to about twenty carbon atoms, wherein each R2, R3, and R4 is independently a hydrogen, a linear or branched-chain monovalent hydrocarbyl group having one to about twenty carbon atoms, each m is independently from 0 and 4, each p is independently from 0 and 4, for each cyclic moiety m + p is from 2 and 4, and each n is independently from 1 and 6.
Abstract:
The present invention provides a thermal management system comprising: a housing having an interior space; a heat-generating component disposed within the interior space; a heat exchanger; and a working fluid liquid disposed within the interior space such that the heat-generating component is in contact with the working fluid; wherein the working fluid comprises a Fischer-Tropsch derived base fluid; an antioxidant additive and an anti- static additive, wherein the thermal management system is constructed such that a constant cyclical flow of working fluid is maintained across the one or more heat-generating components, on to the heat exchanger and then back to the heat-generating component. The present invention also provides a method of thermal management of a heat-generating component comprising the steps of at least partially immersing a heat-generating component in a working fluid; and transferring the heat from the heat-generating component using the working fluid in a constant cyclical flow of working fluid across the one or more heat-generating components, on to a heat exchanger and then back to the heat-generating component, wherein the working fluid comprises a Fischer-Tropsch derived base fluid; an antioxidant additive; and an antistatic additive. The present invention also provides the use of a Fischer-Tropsch derived base fluid in a working fluid in contact with a heat-generating component in a thermal management system to improve anti-aging properties of the working fluid, wherein the working fluid also comprises an antioxidant additive and an anti-static additive.