Lubricating Oil Composition for Hydrogenated DLC Friction Control
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Solution Overview
Problem
Existing lubricating oil compositions with friction modifiers do not effectively adjust the friction property on hydrogen-containing diamond-like carbon (DLC) coatings, making it difficult to improve the friction property of sliding mechanisms.
Innovation Solution
A lubricating oil composition containing a base oil and a friction modifier, where the friction modifier is a fatty acid ester of pentaerythritol, is used in sliding members coated with hydrogen-containing DLC. This composition adjusts the friction property by setting the ratio of the normal dynamic friction coefficient to the minute low speed friction coefficient within a specific range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a friction modifier is added to lubricating oil for DLC coating, then friction adjustment effect should improve, but existing friction modifiers do not sufficiently exhibit friction adjustment effect on hydrogen-containing DLC coating material
Solution Approach 1:
The patent changes the chemical parameters of the friction modifier by selecting specific compounds (fatty acid esters with 2-10 carbon atoms in the alkyl group and/or fatty alcohols with 2-10 carbon atoms) that are compatible with hydrogen-containing DLC coatings. This parameter change resolves the incompatibility issue between conventional friction modifiers and hydrogen-containing DLC coatings, enabling effective friction adjustment.
2Stability of the object's composition
If vibration suppression force is increased through larger frictional force, then steering stability increases, but ride comfort is degraded
Solution Approach 1:
The patent applies dynamics by making the frictional force adjustable rather than fixed. By using the lubricating oil composition with specific friction modifiers, the frictional force can be dynamically optimized to achieve the right balance between steering stability and ride comfort, allowing the system to adapt to different operating conditions.
Solution Approach 2:
The patent changes the friction parameter by introducing a lubricating oil composition with specifically selected friction modifiers (fatty acid esters and fatty alcohols with 2-10 carbon atoms). This parameter change enables precise control of the frictional force, allowing optimization of both steering stability and ride comfort simultaneously.
3Object-affected harmful factors
If vibration suppression force is decreased through smaller frictional force, then ride comfort is improved, but steering stability is degraded
Solution Approach 1:
The patent enables dynamic adjustment of frictional force through the lubricating oil composition, allowing the system to maintain optimal performance across different operating conditions. The friction modifier compounds (fatty acid esters and fatty alcohols with 2-10 carbon atoms) provide controllable friction characteristics that balance ride comfort and steering stability.
Solution Approach 2:
By changing the chemical composition parameters of the lubricating oil (using fatty acid esters with 2-10 carbon atoms and/or fatty alcohols with 2-10 carbon atoms), the patent achieves precise control over frictional force, enabling simultaneous optimization of ride comfort and steering stability that was previously unattainable.
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 lubricating oil composition effectively adjusts the friction property of sliding mechanisms with hydrogen-containing DLC coatings, achieving both steering stability and ride comfort by maintaining a consistent friction coefficient across varying sliding speeds.
Implementation Method 1
A lubricating oil composition to be used in a sliding member coated with hydrogen-containing diamond-like carbon contains a base oil and a friction modifier. The friction modifier contains a fatty acid ester of pentaerythritol.
Data Source
AI summary
A lubricating oil composition according to the present embodiment is a lubricating oil composition to be used in a sliding member coated with hydrogen-containing diamond-like carbon, and contains a base oil and a friction modifier. The friction modifier contains a fatty acid ester of pentaerythritol.