JP-2026514538-A - Fluids for electric vehicles

Abstract

An electric driveline fluid is described. The fluid comprises an oil of a major lubricating viscosity, an electric driveline additive comprising glycerol, glycol, glycol ether, pentaerythritol, vicinal diol, triol, or derivatives thereof, and at least one overbasic sulfonate detergent. The amount of the electric driveline additive is about 0.001% to about 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 (14)

1. Electric drive line fluid, (a) A main amount of oil with lubricating viscosity, (b) Electric driveline additives comprising glycerol, glycol, glycol ether, pentaerythritol, vicinaldiol, triol, or derivatives thereof, (c) comprising at least one overbasic sulfonate detergent, 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, wherein the at least one overbasic sulfonate cleaning agent is highly overbasic calcium sulfonate.
3. The electric driveline fluid according to claim 1, wherein the derivatives are cyclic derivatives.
4. The electric drive line fluid according to claim 1, wherein the electric drive line fluid substantially does not contain a sulfur-containing zinc compound.
5. The electric drive line fluid according to claim 1, wherein the electric drive line fluid has less than 100 ppm of Zn.
6. The electric driveline fluid according to claim 1, further comprising a glycerol derivative containing two or more vicinal diols.
7. The electric driveline fluid according to claim 1, wherein the derivatives are cyclic derivatives having a five-membered or six-membered ring.
8. 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) Electric driveline additives comprising glycerol, glycol, glycol ether, pentaerythritol, vicinaldiol, triol, or derivatives thereof, (c) comprising at least one overbasic sulfonate detergent, 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.
9. The method according to claim 8, wherein the at least one overbasic sulfonate cleaning agent is calcium sulfonate.
10. The method according to claim 8, wherein the derivatives are cyclic derivatives.
11. The method according to claim 8, wherein the electric driveline fluid substantially does not contain a sulfur-containing zinc compound.
12. The method according to claim 8, wherein the electric drive line fluid has less than 100 ppm of Zn.
13. The method according to claim 8, wherein the electric driveline fluid further comprises a glycerol derivative containing two or more vicinal diols.
14. The method according to claim 8, wherein the derivatives are cyclic derivatives having a five-membered or six-membered ring.

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) a major amount of lubricating viscous oil, (b) an electric driveline additive comprising glycerol, glycol, glycol ether, pentaerythritol, vicinal diol, triol, or derivatives thereof, and (c) at least one overbasic sulfonate detergent, 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) a major amount of lubricating viscous oil, (b) an electric driveline additive comprising glycerol, glycol, glycol ether, pentaerythritol, vicinaldiol, triol, or derivatives thereof, and (c) at least one overbasic sulfonate detergent, 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. The test measures the change in electrical conductivity, and the result is expressed as mgKOH/g (the equivalent number of milligrams of KOH required to neutralize 1 gram of the product). Therefore, a high TBN reflects a strongly over-basified product, resulting in a larger base reserve for neutralizing the acid. 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 automobiles), 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 lubricating additive (electric driveline additive) and/or a lubricating oil composition (e.g., electric driveline fluid) containing the same. This composition(s) is suitable for use in automobiles with electric drivelines (i.e., automobiles equipped with electric motors). More specifically, the lubricating oil composition comprises a lubricating additive and a highly perbasic sulfonate detergent. As an advantage, the composition exhibits enhanced protection against fatigue, wear, and/or friction. In some 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. Electric Driveline Additives The lubricating oil compositions of this disclosure include electric driveline additives. Electric driveline additives include glycerol, glycerol derivatives, glycols, glycol ethers, pentaerythritol, pentaerythritol derivatives, vicinaldiols, triols, or cyclic derivatives thereof. Glycerol and derivatives A compound can be considered a derivative of glycerol if it contains two or more 1,2-diol structural motifs. In some embodiments, the derivative of glycerol consists of 24 or fewer carbon atoms, such as 23 or fewer carbon atoms, 22 or fewer carbon atoms, 21 or fewer carbon atoms, 20 or fewer carbon atoms, 19