Ester Functional Fluid for EV Lubrication and Material Compatibility
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Solution Overview
Problem
Existing functional fluids for electric vehicles fail to provide effective lubrication, thermal management, and compatibility with electric vehicle components without causing damage to elastomer seals and plastic components, necessitating a fluid with improved lubricity, thermal properties, electrical properties, and compatibility with various materials.
Innovation Solution
The use of specific esters, such as those derived from esterification of saturated branched monoalcohols with isostearic acid or other fatty acids, which exhibit low kinematic viscosity, high flash point, and good compatibility with elastomers and plastics, are integrated into a functional fluid for electric vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional functional fluids are used for lubrication and cooling, then lubrication and cooling functions are provided, but compatibility with elastomer seals and plastic components deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the functional fluid by using specific ester base oils with controlled molecular structures and compositions that are inherently compatible with elastomers and plastics, rather than relying on additive packages that may cause degradation
Solution Approach 2:
The functional fluid is formulated as a composite composition containing specific ratios of different ester types (e.g., diester, triglyceride, ester from branched monoalcohol) combined with carefully selected additive packages that provide both lubrication and compatibility without causing material damage
2Reliability
If the functional fluid provides effective lubrication, then friction reduction is improved, but thermal properties and electrical properties may deteriorate
Solution Approach 1:
The functional fluid is designed to perform multiple functions simultaneously: lubrication (reducing friction in gear systems), thermal management (cooling battery packs and power electronics through high thermal conductivity), and electrical isolation (protecting electrical components with appropriate dielectric properties), all within a single fluid formulation
Solution Approach 2:
The patent optimizes multiple physical parameters of the functional fluid including viscosity index, thermal conductivity, dielectric breakdown voltage, and flash point by selecting specific ester base oils and additive combinations that balance lubrication performance with thermal and electrical properties
3Speed
If the functional fluid has low viscosity for better flow, then cooling efficiency is improved, but lubrication capability may deteriorate
Solution Approach 1:
The patent carefully controls the viscosity parameter of the functional fluid by selecting ester base oils with appropriate molecular weights and structures, and by optimizing additive concentrations, to achieve a balance where the fluid remains thin enough for efficient circulation and cooling while maintaining sufficient viscosity for effective lubrication film formation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The esters demonstrate superior lubricity, thermal conductivity, and compatibility with elastomers and plastics, ensuring effective lubrication and cooling of electric vehicle components without damage, meeting the stringent requirements of electric vehicles.
Implementation Method 1
The same functional fluid can be used to lubricate the gears
Implementation Method 2
a thermal conductivity of at least 0.1300 W/(m. ° C.) at 20° C.
Data Source
AI summary
The present invention relates to the use of specific esters in a functional fluid for electric vehicles.