Gear Lubricant Composition Reducing Surface Roughness

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Solution Overview

Problem

Current lubricant compositions for automotive and industrial gears face challenges in improving operating efficiency and reducing surface roughness while minimizing the need for expensive mechanical processing methods, as existing solutions either rely on mechanical processing or fail to provide comprehensive performance in ASTM standards.

Innovation Solution

A lubricant composition comprising an oil of lubricating viscosity, 0.5 to 2.0 wt% amine alkyl(thio)phosphate, and 0.2 to 0.8 wt% metal alkylthiophosphate, with a total sulfur level of 2 to 5 wt%, which reduces surface roughness and fluid traction coefficient, thereby enhancing efficiency and reducing operating temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If mechanical processing methods (honing, top polishing, vibratory finishing) are used to reduce surface roughness, then operating efficiency is improved, but manufacturing cost and production time increase

Engineering Contradiction:

Improveoperating efficiencyVSAvoidmanufacturing cost

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent replaces mechanical processing methods with a chemical solution by formulating a lubricant composition containing specific additives (0.5-2.0 wt% amine alkyl(thio)phosphate and 0.2-0.8 wt% metal alkylthiophosphate) that chemically modify the gear surface to reduce roughness, thereby eliminating the need for expensive mechanical honing, polishing, or vibratory finishing operations

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the chemical parameters of the lubricant by incorporating specific concentrations of amine alkyl(thio)phosphate (0.5-2.0 wt%) and metal alkylthiophosphate (0.2-0.8 wt%) with total sulfur content of 2-5 wt%, which enables the lubricant to actively reduce surface roughness through chemical interaction rather than relying on mechanical removal of material

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If lubricant additives are used to reduce surface roughness and improve efficiency, then mechanical processing costs are reduced, but the lubricant composition complexity increases

Engineering Contradiction:

Improvemanufacturing costVSAvoidlubricant composition complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent achieves multi-functionality by designing a lubricant composition where the combination of amine alkyl(thio)phosphate and metal alkylthiophosphate simultaneously provides surface roughness reduction, friction modification, and film strength enhancement, allowing a single lubricant formulation to perform multiple functions that would otherwise require separate additives or processing steps

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent creates a composite lubricant system by combining two specific chemical compounds (amine alkyl(thio)phosphate and metal alkylthiophosphate) in defined proportions, where the synergistic interaction between these components produces enhanced effects that neither compound achieves alone, thereby managing complexity through deliberate composite formulation

Inventive Principle:

Principle #40Composite materials

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 lubricant composition effectively reduces surface roughness and friction, improving the operating efficiency and temperature management of gears, particularly under high load and low speed conditions, without requiring costly mechanical processing, and meets performance standards such as ASTM D7452, D6121, and D4172.

Implementation Method 1

The use of amine alkyl(thio)phosphate chemistry with metal alkylthiophosphate chemistry not common to gear oil use was found to be beneficial for reducing surface roughness

Methodology Applied

Scientific EffectChemical interaction: Chemical Bonding

Implementation Method 2

lubricant composition for automotive or industrial gears... improving efficiency and reducing operation temperatures

Methodology Applied

Scientific EffectLubrication: Lubrication

Implementation Method 3

improving efficiency and reducing operation temperatures

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Data Source

PatentEP3884016B1Lubricating composition for automotive or industrial gears and use thereof

Publication Date: 2023.05.31 THE LUBRIZOL CORP

AI summary

The disclosed technology relates to a lubricant composition for automotive or industrial gears, as well as axles and bearings, the lubricant composition containing an oil of lubricating viscosity and a metal alkylthiophosphate compound, such as zinc dialkyldithiophosphate, as well as a method of obtaining extreme pressure performance in automotive or industrial gears, axles and bearings at lower sulfur content than is typical, by lubricating such automotive or industrial gears, axles and bearings with a lubricant composition containing a metal alkylthiophosphate compound, such as zinc dialkyldithiophosphate.