Lubricant composition

A lubricating oil composition using Fischer-Tropsch-derived or poly-α-olefin base oil with a friction modifier additive addresses friction and wear resistance issues in electric vehicles, ensuring low friction and improved durability in e-axle applications.

JP2026086370APending Publication Date: 2026-05-26SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BV
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BV
Filing Date
2025-11-05
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing lubricants for electric vehicles face challenges in reducing friction across various lubrication states without adversely affecting wear resistance or promoting copper corrosion, particularly in elastohydrodynamic lubrication conditions.

Method used

A lubricating oil composition comprising a Fischer-Tropsch-derived or poly-α-olefin base oil with a specific friction modifier additive, forming an adsorption film under EHL conditions, providing low friction in all lubrication states while maintaining wear resistance and preventing copper corrosion.

Benefits of technology

The composition achieves low friction and improved wear resistance, suitable for e-axle applications in electric vehicles, with a kinematic viscosity range of 2.0 to 5.5 cSt, effectively addressing the limitations of conventional lubricants.

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Abstract

Providing a lubricating oil composition suitable for use in electric vehicles. 【Solution】A base oil containing a Fischer-Tropsch-derived base oil, a poly-α-olefin base oil, or a mixture thereof, and a friction modifier additive in the range of 0.5 to 12% by weight, wherein the friction modifier additive has the formula (I): R 1 [(AO) n -R 2 m (I) [In the formula, R 1 is a residue of a group having at least two active hydrogen atoms, m is at least 2, AO is an alkylene oxide residue, each n is independently 0 to 100, each R 2 is independently H or R 3 , and each R 3 is independently a residue of a polyhydroxyalkyl or polyhydroxyalkenyl carboxylic acid, a residue of a hydroxyalkyl or hydroxyalkenyl carboxylic acid and / or a residue of an oligomer of a hydroxyalkyl or hydroxyalkenyl carboxylic acid], and the kinematic viscosity at 100 ° C is in the range of 2.0 to 5.5 cSt.​
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