EV Lubricating Oil Composition with Polyamide Additives

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Solution Overview

Problem

Existing lubricating oil compositions for electric vehicles and hybrid vehicles fail to simultaneously satisfy gear properties, clutch properties, cooling properties, and electric insulating properties.

Innovation Solution

A lubricating oil composition is developed by blending a base oil with a polyamide and/or a polyol ester, where the base oil includes a synthetic oil with a kinematic viscosity of 1.0 to 10.0 mm2/s at 100°C, enhancing gear and clutch properties while providing cooling and insulating properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a lubricating oil composition is designed to have gear properties and clutch properties, then seizure resistance and shear stability are improved, but cooling properties and electric insulating properties deteriorate

Engineering Contradiction:
Improvegear propertiesVSAvoidcooling properties
Core Design Contradiction:
ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies multi-functionality by formulating a single lubricating oil composition that simultaneously provides gear lubrication, clutch operation, motor cooling, and electrical insulation. This is achieved through careful selection of base oils (Group IV- VI synthetic oils with specific viscosity ranges) and additive packages that deliver multiple functions without compromising any single performance aspect.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent employs composite material principles by combining multiple base oil types (polyalphaolefin, ester oil, synthetic hydrocarbon oil) in specific proportions, along with various additives including viscosity index improvers, anti-wear agents, and friction modifiers. This composite formulation enables the oil to satisfy contradictory requirements for gear protection and cooling efficiency simultaneously.

Inventive Principle:
Principle #40Composite materials

2Reliability

If a lubricating oil composition is designed to have gear properties and clutch properties, then seizure resistance and shear stability are improved, but electric insulating properties deteriorate

Engineering Contradiction:
Improvegear propertiesVSAvoidelectric insulating properties
Core Design Contradiction:
ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies multi-functionality by formulating a single lubricating oil composition that simultaneously provides gear lubrication, clutch operation, motor cooling, and electrical insulation. This is achieved through careful selection of base oils (Group IV- VI synthetic oils with specific viscosity ranges) and additive packages that deliver multiple functions without compromising any single performance aspect.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent applies parameter changes by precisely controlling the viscosity range (1.0 to 10.0 mm²/s at 100°C) and viscosity index (100 or more) of the base oil, along with specifying additive concentrations (0.1-5.0 wt% viscosity index improver, 0.01-1.0 wt% anti-wear agent). These parameter optimizations ensure adequate electrical insulation while maintaining gear protection capabilities.

Inventive Principle:
Principle #35Parameter changes

3Ease of manufacture

If a lubricating oil composition uses conventional base oils, then manufacturing cost is reduced, but viscosity index and shear stability deteriorate

Engineering Contradiction:
Improvemanufacturing costVSAvoidviscosity index
Core Design Contradiction:
Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent applies parameter changes by specifying precise viscosity index requirements (100 or more) and viscosity ranges at different temperatures. It recommends Group IV- VI synthetic base oils with these improved parameters, accepting the higher material cost in exchange for superior performance characteristics required for modern transmission systems.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material principles by combining multiple base oil types (polyalphaolefin, ester oil, synthetic hydrocarbon oil) in specific proportions, along with various additives including viscosity index improvers, anti-wear agents, and friction modifiers. This composite formulation enables the oil to satisfy contradictory requirements for gear protection and cooling efficiency simultaneously.

Inventive Principle:
Principle #40Composite materials

4Reliability

If a lubricating oil composition uses high viscosity base oil, then gear properties are improved, but cooling properties and low-temperature fluidity deteriorate

Engineering Contradiction:
Improvegear propertiesVSAvoidcooling properties
Core Design Contradiction:
ReliabilityVSTemperature

Solution Approach 1:

The patent applies parameter changes by optimizing the viscosity range to 1.0 to 10.0 mm²/s at 100°C with a viscosity index of 100 or more. This specific parameter range ensures adequate film thickness for gear protection while maintaining sufficient fluidity for effective motor cooling and low-temperature operability.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent applies multi-functionality by formulating a single lubricating oil composition that simultaneously provides gear lubrication, clutch operation, motor cooling, and electrical insulation. This is achieved through careful selection of base oils (Group IV- VI synthetic oils with specific viscosity ranges) and additive packages that deliver multiple functions without compromising any single performance aspect.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Data Source

PatentUS10815447B2Electric vehicle or hybrid vehicle lubricating oil composition
Publication Date: 2020.10.27 IDEMITSU KOSAN CO LTD

AI summary

Provided is a lubricating oil composition for electric vehicle or hybrid vehicle having excellent gear properties, clutch properties, cooling properties, and electric insulating properties. The lubricating oil composition for electric vehicle or hybrid vehicle preparing by blending (A) a base oi and (B-1) a polyamide and/or (B-2) a polyol ester, the base oil (A) including (A-1) a synthetic oil having a kinematic viscosity at 100° C. of 1.0 to 10.0 mm2/s.