Lubricating Grease Composition for Dual Mass Flywheel Friction Reduction
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Solution Overview
Problem
Current lubricating greases for dual mass flywheel applications do not adequately meet the increasing demand for improved friction reduction and stability, particularly under centrifugal forces.
Innovation Solution
A lubricating grease composition comprising polyalkylene glycol base oil, a lithium complex thickener of C12 to C24 hydroxycarboxylic acid and C2 to C12 dicarboxylic acid, and 0.1 to 10 weight % of dimer or trimer acids, which reduces friction and enhances stability and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium soap complex greases are used in dual mass flywheel applications, then satisfactory lubricating properties are achieved, but friction reducing properties are insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the grease by incorporating specific carboxylic acids (dimer and trimer acids with 36-54 carbon atoms) into the lithium soap complex formulation. This parameter change enhances the friction reducing properties while maintaining the satisfactory lubricating properties of the base lithium soap complex grease.
Solution Approach 2:
The patent creates a composite grease material by combining polyalkylene glycol base oil, lithium soap thickener, and specific carboxylic acid additives. This composite formulation synergistically improves both lubricating properties and friction reduction, addressing the limitation of conventional single-component or simple mixture greases.
2Ease of operation
If conventional grease formulations are used, then basic lubrication is provided, but stability and resistance to centrifugal forces are insufficient
Solution Approach 1:
The patent optimizes the chemical parameters of the grease formulation by specifying precise ranges for the carboxylic acid content (0.1-10 weight %) and the carbon atom count (36-54), which enhances the structural stability and resistance to centrifugal forces while maintaining basic lubrication functionality.
Solution Approach 2:
The patent employs a relatively simple and cost-effective formulation using common lithium soap thickeners and polyalkylene glycol base oils, enhanced by straightforward carboxylic acid additives, achieving superior stability without requiring complex or expensive specialized materials.
3Object-affected harmful factors
If standard lubricating grease is used, then friction is controlled, but grease lifetime is limited
Solution Approach 1:
The patent develops a composite grease system where the carboxylic acid additives work synergistically with the lithium soap complex and polyalkylene glycol base oil to enhance oxidative stability and resistance to degradation, thereby extending grease lifetime while maintaining effective friction control.
Solution Approach 2:
The patent formulates a grease composition with enhanced oxidative stability and resistance to thermal and mechanical degradation, enabling continuous effective lubrication over extended periods and conditions, thus extending grease lifetime while maintaining friction control.
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 grease composition exhibits excellent friction-reducing properties, stability, high resistance to centrifugal forces, and extended grease lifetime.
Implementation Method 1
The primary purpose of lubrication is separation of solid surfaces moving relative to one another, to minimise friction and wear. The materials most frequently used for this purpose are oils and greases.
Implementation Method 2
high resistance to centrifugal forces
Implementation Method 3
high resistance to centrifugal forces
Data Source
AI summary
Lubricating grease composition comprising: (i) a polyalkylene glycol base oil; (ii) a lithium complex thickener; and (iii) a carboxylic acid comprising 18 carbon atoms or greater. The lubricating grease compositions according to the present invention are particularly useful for reducing friction in a dual mass flywheel application.