EV Transmission Fluid Composition for Lower Traction Loss
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Solution Overview
Problem
Current lubricant compositions for electric vehicles do not adequately address the need for improved energy efficiency, low traction, oxidative stability, and compatibility with electric vehicle components, leading to increased energy losses and reduced battery life.
Innovation Solution
A lubricant composition comprising a base stock and a traction coefficient additive of Formula (I), which includes a residue of a group with active hydrogen atoms alkoxylated with alkylene oxide and terminated with polyhydroxyalkyl or polyhydroxyalkenyl carboxylic acid residues, to reduce traction coefficient and enhance oxidative stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional lubricant base stock is used, then the lubricant provides basic lubrication, but the traction coefficient remains high leading to increased energy losses
Solution Approach 1:
The patent applies parameter changes by introducing a traction coefficient additive with specific molecular structure (Formula I) that modifies the lubricant's friction characteristics. The additive contains polyalkylene oxide groups and carboxylic acid residues that chemically interact with metal surfaces to reduce traction coefficient by up to 25%, directly addressing the energy loss problem in electric vehicle powertrains
Solution Approach 2:
The patent creates a composite lubricant composition by combining a base stock (Group II, III, IV, or V) with a specifically designed traction coefficient additive. This composite formulation integrates the base oil's lubrication properties with the additive's friction-reducing capabilities, achieving both low traction and adequate lubrication simultaneously
2Loss of energy
If the lubricant composition is optimized for low traction, then energy efficiency improves, but oxidative stability may be compromised
Solution Approach 1:
The additive's molecular parameters are specifically designed to balance friction reduction with oxidative stability. The carboxylic acid residues (R2 groups) provide metal surface interaction for low traction while the polyalkylene oxide chains (AO)n maintain compositional stability and resistance to oxidation under operating conditions
Solution Approach 2:
The composite lubricant formulation combines base stock with the traction coefficient additive in optimized proportions (at least 2 wt% of the additive). This composite structure ensures that the low-traction benefits are achieved while the base stock provides oxidative stability, preventing the trade-off between the two properties
3Stability of the object's composition
If a synthetic base stock is used, then oxidative stability improves, but solvency of polar additives deteriorates
Solution Approach 1:
The additive's molecular structure parameters are adjusted to enhance solubility in synthetic base stocks. The polyalkylene oxide groups provide polarity that improves compatibility with Group IV and V base stocks, while the carboxylic acid residues maintain effectiveness on metal surfaces, resolving the solvency issue with synthetic oils
Solution Approach 2:
The patent formulates a composite lubricant that is specifically adapted for synthetic base stocks. The traction coefficient additive's amphiphilic structure (hydrophilic carboxylic acid groups and hydrophobic polyalkylene oxide chains) enables it to dissolve effectively in synthetic base stocks while maintaining its friction-reducing function
Data Source
AI summary
A lubricant composition suitable for use in an electric vehicle comprising a traction coefficient additive is provided herewith. The lubricant composition provides utility as an electric vehicle gear oil, and in particular electric vehicle transmission fluids. The lubricant composition provides improved coefficient of traction properties when in use as compared to equivalent lubricant compositions devoid of the traction coefficient additive.