JP-2026514539-A - Nitrogen and sulfur-containing additives in fluids for electric vehicles

Abstract

The electric driveline fluid is described. The fluid comprises an oil of a major lubricating viscosity and an electric driveline additive. The electric driveline additive includes a nitrogen or sulfur-containing additive or a derivative thereof. The amount of the electric driveline additive is approximately 0.001% by weight to approximately 1.5% by weight, based on the total weight of the electric driveline fluid. [Selection Diagram] None

Inventors

• ホルブルック、トラヴィス
• チェイス、ケビン ジェイ．

Assignees

• シェブロン・オロナイト・カンパニー・エルエルシー

Dates

Publication Date

20260511

Application Date

20240502

Priority Date

20230503

Claims (15)

1. Electric drive line fluid, (a) A main amount of oil with lubricating viscosity, (b) an electric driveline additive containing a nitrogen or sulfur-containing additive or a derivative thereof, The amount of the electric driveline additive is approximately 0.001% by weight to approximately 1.5% by weight, based on the total weight of the electric driveline fluid. The aforementioned electric drive line fluid.
2. The electric driveline fluid according to claim 1, further comprising a perbasic sulfonate cleaning agent.
3. The electric driveline fluid according to claim 1, wherein the nitrogen or sulfur-containing additive is an alkyl polyol.
4. The electric driveline fluid according to claim 1, wherein the derivative is a cyclic derivative.
5. The electric drive line fluid according to claim 1, wherein the electric drive line fluid substantially does not contain a sulfur-containing zinc compound.
6. The electric drive line fluid according to claim 1, wherein the electric drive line fluid has less than 100 ppm of Zn.
7. The electrofluid according to claim 1, wherein the sulfur-containing compound is thioglycerol, thion, thioether, disulfide, or polysulfide.
8. The electrofluid according to claim 1, wherein the nitrogen-containing compound is a polyolamine, polyolamide, or hydroxyaminoether.
9. A method for improving the wear, friction, or fatigue performance of an engine equipped with an electric driveline, the method comprising lubricating the engine with an electric driveline fluid, the electric driveline fluid being (a) A main amount of oil with lubricating viscosity, (b) an electric driveline additive comprising a nitrogen or sulfur-containing compound or a derivative thereof, The amount of the electric driveline additive is approximately 0.001% by weight to approximately 1.5% by weight, based on the total weight of the electric driveline fluid. The aforementioned method.
10. The method according to claim 9, wherein the electric driveline fluid further comprises a perbasic sulfonate cleaning agent.
11. The method according to claim 9, wherein the derivative is a cyclic derivative.
12. The method according to claim 9, wherein the electric driveline fluid substantially does not contain a sulfur-containing zinc compound.
13. The method according to claim 9, wherein the electric drive line fluid has less than 100 ppm of Zn.
14. The method according to claim 9, wherein the sulfur-containing compound is thioglycerol, thion, thioether, disulfide, or polysulfide.
15. The method according to claim 9, wherein the nitrogen-containing compound is a polyolamine, polyolamide, or hydroxyamino ether.

Description

This disclosure relates to lubricating additive compositions and lubricating oil compositions containing the same. More specifically, the compositions provide improved protection against wear, friction, and/or fatigue in electric vehicles. Wear, friction, and/or fatigue can be major problems for conventional internal combustion engines. The same can be major problems for vehicles utilizing electric motors based on planetary gears (e.g., electric vehicles or hybrid vehicles). Unlike conventional vehicles, electric vehicles and/or hybrid vehicles present several unique challenges, particularly because the same lubricating fluid is often shared between the electric motor and transmission. In one embodiment, the present disclosure relates to an electric driveline fluid, the electric driveline fluid comprising (a) an oil of a major lubrication viscosity and (b) an electric driveline additive containing a nitrogen or sulfur-containing additive or a derivative thereof, wherein the amount of the electric driveline additive is about 0.001% by weight to about 1.5% by weight, based on the total weight of the electric driveline fluid. In another embodiment, the present disclosure relates to a method for improving the wear, friction, or fatigue performance of an engine equipped with an electric driveline, the method comprising lubricating the engine with an electric driveline fluid, the electric driveline fluid comprising (a) an oil of a major lubrication viscosity and (b) an electric driveline additive comprising a nitrogen or sulfur-containing compound or a derivative thereof, the amount of the electric driveline additive being about 0.001% by weight to about 1.5% by weight, based on the total weight of the electric driveline fluid. Definitions: The following terms are used throughout this specification and, unless otherwise indicated, have the following meanings: The term "major amount" of base oil refers to an amount of base oil that is at least 40% by weight of the lubricating oil composition. In some embodiments, the "major amount" of base oil refers to an amount of base oil that is more than 50% by weight, more than 60% by weight, more than 70% by weight, more than 80% by weight, or more than 90% by weight of the lubricating oil composition. "HOB" refers to high overbasicity, where the TBN (Total Body Value) of the active substance exceeds 250, while "LOB" refers to low overbasicity, where the TBN of the active substance is less than 100. The term "Total Base Number," or "TBN," refers to the level of alkalinity in an oil sample, indicating the composition's ability to continue neutralizing corrosive acids, according to ASTM standard number D2896 or an equivalent procedure. This test measures the change in conductivity, expressing the result as mgKOH/g (the equivalent number of milligrams of KOH required to neutralize one gram of the product). Therefore, a high TBN reflects the strong overbasicity of the product, resulting in a large reserve of base for neutralizing acids. As used herein, EV fluid refers to electric drive fluid used in electric vehicles equipped with wet EV motors. Electric drive fluid is similar to transmission fluid (used in conventional vehicles) but typically has one or more additional functions (e.g., acting as a coolant for the EV motor and providing electrical resistance). These additional functions can present unique challenges in formulating EV fluids. This application relates to a nitrogen or sulfur-containing additive and/or a lubricating oil composition (e.g., an electric driveline fluid) containing the same. This composition(s) is suitable for use in automobiles including electric drivelines (i.e., automobiles equipped with electric motors). More specifically, the lubricating oil composition comprises a nitrogen or sulfur-containing additive. In some embodiments, the lubricating oil composition comprises a nitrogen or sulfur-containing additive (electric driveline additive) and a highly overbasic sulfonate detergent. As an advantage, the composition exhibits enhanced protection against fatigue, wear, and/or friction. In some additional embodiments, the lubricating oil compositions of the present invention can provide protection against fatigue, wear, and/or friction in hybrid vehicles or plug-in hybrid vehicles equipped with electric motors. Nitrogen or Sulfur-Containing Additive The lubricating oil compositions of this disclosure include an electric driveline additive comprising a nitrogen or sulfur-containing additive or a cyclic derivative thereof. In some embodiments, the nitrogen or sulfur-containing additive is an alkyl polyol containing one or more nitrogen or sulfur atoms. In embodiments, the nitrogen or sulfur-containing additive is an alkyl polyol containing 25 or fewer carbon atoms, such as 24 or fewer carbon atoms, 23 or fewer carbon atoms, 22 or fewer carbon atoms, 21 or fewer carbon atoms, 20 or fewer carbon atoms, 19 or fewer carbon atoms, 18 or fewer carbon atoms, 17 o