Power Transmitting Fluids for Fluoropolymer Seal Compatibility
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Solution Overview
Problem
Fluoropolymer seals used in vehicle transmission systems are susceptible to de-polymerization when exposed to amine-containing lubricant additives, leading to compatibility issues, and there is a need for lubricants that are less aggressive towards these materials while also ensuring compatibility with copper-containing components.
Innovation Solution
A power transmitting fluid comprising a lubricating oil and an additive composition containing a friction modifier with a specific structure, an oil-soluble phosphorus compound, and an ashless dispersant, which provides improved compatibility with fluoropolymer seals and copper-containing parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If amine-containing friction modifiers are used in lubricants, then friction reduction is improved, but fluoropolymer seal compatibility deteriorates due to de-polymerization
Solution Approach 1:
The invention changes the chemical structure parameters of the friction modifier by replacing traditional amine compounds with carboxylic acid compounds containing polyalkylene glycol chains. This structural parameter change maintains friction reduction capability while eliminating the de-polymerization effect on fluoropolymer seals, thus resolving the compatibility issue.
Solution Approach 2:
The carboxylic acid compound acts as an intermediary substance that provides the desired friction modification function without directly attacking the fluoropolymer seal. The specific molecular structure with polyalkylene glycol chains serves as a mediator that is compatible with both the friction modification requirement and the seal material.
2Ease of operation
If traditional friction modifiers are used, then friction control is achieved, but copper corrosion resistance deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters by using carboxylic acid compounds instead of traditional amine-based friction modifiers. This compositional change provides better protection against copper corrosion while maintaining effective friction control in automatic transmission fluids.
Data Source
AI summary
A power transmitting fluid comprises a major amount of a lubricating oil and a minor amount of an additive composition. The additive composition comprises:(a) a friction modifier of the formula:(b) an oil-soluble phosphorus compound; and,(c) an ashless dispersant;wherein R1 and R2 may be the same or different and represent linear or branched, saturated or unsaturated hydrocarbyl groups having from 8 to 20 carbon atoms. Z represents a polyoxyalkylene segment or a polyalkoxylated alkyl amine segment. The friction modifiers provide the fluid with improved fluoroelastomer seal compatibility and enhanced copper corrosion compatibility.