Lubricant Composition Friction Durability
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Solution Overview
Problem
Current lubricant compositions for automatic transmissions face challenges in maintaining optimal friction properties over time, particularly in achieving high static friction for torque transfer while avoiding adverse effects on seal materials and ensuring long-term durability.
Innovation Solution
A lubricant composition incorporating a phosphorus-containing species and an amine compound, characterized by a specific molar ratio of phosphorus to nitrogen, which enhances friction durability and maintains minimum static friction levels without additional friction modifier additives, thereby supporting 'fill-for-life' transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high levels of amines are used as friction modifiers to improve friction properties, then friction reduction is improved, but static friction performance drops to unacceptable levels causing transmission to not be able to transmit torque effectively
Solution Approach 1:
The invention changes the chemical composition parameters by using a specific phosphorus-containing species with a controlled P/N molar ratio (0.40 to 1.50) instead of conventional amines. This parameter change allows achieving low boundary friction while maintaining adequate static friction levels, resolving the contradiction between friction reduction and torque transmission capability
Solution Approach 2:
The invention employs a composite additive package combining the phosphorus-containing species (formula IV) with specific base oils and optional complementary additives. This composite approach creates a synergistic effect that simultaneously achieves low boundary friction and maintains static friction above 0.1, overcoming the limitations of single-additive systems
2Loss of energy
If high levels of amines are used as friction modifiers, then friction properties are improved, but deleterious effects on polymeric seal materials occur
Solution Approach 1:
The invention extracts the harmful amine component from the friction modification system and replaces it with a phosphorus-containing species. This substitution eliminates the deleterious effects on polymeric seal materials while retaining the beneficial low boundary friction properties, thereby resolving the contradiction between friction performance and seal compatibility
Solution Approach 2:
The invention uses a phosphorus-containing compound that provides effective friction modification without the long-term degradation issues associated with amines. The additive package is designed to maintain performance throughout the transmission fluid service life without causing seal deterioration, effectively replacing harmful short-term solutions with a durable alternative
3Duration of action of moving object
If the amount of friction modifier is increased to improve friction durability, then friction durability is improved, but the friction coefficient drops to undesirable levels especially the static coefficient of friction
Solution Approach 1:
The invention changes the chemical nature of the friction modifier from conventional amines to a phosphorus-containing species with specific molecular structure (formula IV). This parameter change enables the additive to provide durable friction modification while maintaining static friction coefficient above 0.1, resolving the contradiction between friction durability and static friction level
Solution Approach 2:
The phosphorus-containing additive dynamically adapts to the friction surfaces over time, forming stable boundary films that maintain consistent friction characteristics throughout the fluid's service life. This dynamic behavior ensures both friction durability and adequate static friction levels are achieved simultaneously
Data Source
AI summary
A lubricant composition comprising a mixture of a lubricating oil and a compound having a phosphorus containing species and an amine having the formula I: or a solvate, hydrate, or proadditive thereof, wherein moietie(s) R1 is/are hydrocarbon groups and at least one of R1 is selected from the group consisting of: --(C1-C20)alkyl, --(C1-C20)alkenyl, --(C5-C20)cycloalkyl; R is selected from the group consisting of: --(C4-C20)alkyl, --(C4-C20)alkenyl, --(C5-C20)cycloalkyl; and wherein R2, R3 and R4 are independently selected from the group consisting of: -H, --(C6-C36)alkyl, --(C6-C36)alkenyl, --(C6-C36)cycloalkyl, wherein at least one of R2, R3 and R4 is not H; X is O or S; Y1 and Y2 are independently selected from S and O; m is 1 or 2, n is 0 or 1, p is 1 or 2, with the proviso that m + n + p = 3 and q = 0.8 to 1.2 * p, wherein the compound of formula I provides at least 48 ppm of phosphorus based on the total weight of the lubricant composition and wherein the compound of formula I provides a molar ratio phosphorus to nitrogen (P/N) in the range of 0.40 to 1.50.