Urea Grease Composition for Stable Kinematic Friction
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Solution Overview
Problem
Conventional lithium soap greases offer better ride quality but are poor in heat resistance and oxidation stability, while urea greases provide good heat resistance and oxidation stability but fail to adequately lower kinematic friction in lubrication parts, often causing vibration and fluctuating friction forces.
Innovation Solution
A urea-based grease composition with a base oil having a kinematic viscosity of 100 mm2/s or more and urea-based thickener particles with an average diameter of 2.0 μm or less and specific surface area of 1.0×105 cm2/cm3 or more, optimized by controlling particle size and base oil viscosity to maintain consistent kinematic friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lithium soap grease is used, then ride quality is improved, but heat resistance and oxidation stability deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters by using urea-based thickener instead of lithium soap, and optimizes particle size (2.0 μm or less) and base oil viscosity (100 mm²/s or more) to achieve both good ride quality and heat resistance/oxidation stability simultaneously
Solution Approach 2:
The invention creates a composite grease system combining urea-based thickener particles with specific base oil properties, forming a new material composition that integrates the advantages of both ride quality and thermal stability
2Reliability
If conventional urea grease is used, then heat resistance and oxidation stability are improved, but kinematic friction force increases and ride quality deteriorates
Solution Approach 1:
The invention optimizes critical parameters including reducing urea-based thickener particle size to 2.0 μm or less and increasing base oil viscosity to 100 mm²/s or more, which transforms the friction characteristics to achieve both heat resistance and good ride quality
3Reliability
If conventional urea grease is used, then heat resistance is improved, but kinematic friction force fluctuates causing vibration
Solution Approach 1:
The invention stabilizes kinematic friction force by optimizing base oil viscosity (100 mm²/s or more) and controlling particle characteristics, eliminating fluctuations that cause vibration while maintaining heat resistance
Solution Approach 2:
The invention achieves stable friction characteristics through optimized material composition that provides consistent lubrication performance, effectively suppressing vibration caused by friction fluctuations
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 effectively maintains consistent kinematic friction in lubrication parts, reducing vibration and friction fluctuations while enhancing heat resistance and oxidation stability.
Implementation Method 1
a grease composition containing a base oil (A) and a urea-based thickener (B), wherein the base oil (A) has a kinematic viscosity at 40° C. of 100 mm2/s or more
Implementation Method 2
the particles containing the urea-based thickener (B) in the grease composition satisfy the following requirement (I): the area-based arithmetic average particle diameter of the particles is 2.0 μm or less
Data Source
AI summary
The present invention addresses a problem of providing a grease composition containing a urea-based thickener and capable of appropriately maintaining the kinematic friction force in lubrication parts. The grease composition contains a base oil (A) and a urea-based thickener (B), wherein the base oil (A) has a kinematic viscosity at 40° C. of 100 mm2/s or more, and the particles containing the urea-based thickener (B) in the grease composition satisfy the following requirement (I). Requirement (I): the area-based arithmetic average particle diameter of the particles is 2.0 μm or less, as measured by a laser diffraction/scattering method.