Lubricating Oil Composition Viscosity Control for Engine Wear
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Solution Overview
Problem
Lubricating oil compositions disclosed in existing technologies exhibit low HTHS viscosity at around 80°C, leading to difficulties in retaining oil film thickness and increased engine wear, compromising fuel saving and anti-wear properties.
Innovation Solution
A lubricating oil composition with a base oil and viscosity index improver, optimized to maintain a kinematic viscosity of 11.5 mm²/s or less at 80°C and a specific ratio of kinematic viscosity to oil film thickness, ensuring improved fuel saving and anti-wear properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the HTHS viscosity is reduced to improve fuel saving properties, then fuel consumption decreases, but the oil film thickness is difficult to retain and engine wear increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the kinematic viscosity at 80°C to be 11.5 mm²/s or less and the ratio of kinematic viscosity at 80°C to oil film thickness to be less than 0.105 (mm²/s)/nm. These specific parameter adjustments optimize the lubricating oil composition to achieve both fuel saving properties and anti-wear properties at around 80°C, resolving the contradiction between reduced viscosity for fuel efficiency and sufficient oil film retention for wear protection.
2Use of energy by moving object
If the kinematic viscosity at 80°C is reduced to improve fuel saving, then energy consumption decreases, but the oil film thickness ratio becomes insufficient compromising reliability
Solution Approach 1:
The patent implements parameter changes by establishing specific thresholds for kinematic viscosity at 80°C (11.5 mm²/s or less) and the ratio of kinematic viscosity at 80°C to oil film thickness (less than 0.105 (mm²/s)/nm). These controlled parameter changes enable the lubricating oil composition to achieve optimal balance between fuel saving properties through reduced viscosity and reliable oil film retention for engine protection.
Data Source
AI summary
Provided is a lubricating oil composition containing a base oil (A) and a viscosity index improver (B) and satisfying the following requirements (I) and (II):Requirement (I): a kinematic viscosity at 80° C., V80 of the lubricating oil composition is 11.5 mm2/s or less;Requirement (II): a ratio [V80/T80] of a kinematic viscosity at 80° C., V80 (m2/s) to an oil film thickness measured at a sliding speed of 2.0 m/s, a maximum Hertz pressure of 0.8 GPa, and an oil temperature of 80° C., T80 (nm) of the lubricating oil composition is less than 0.105 ((m2/s)/nm).The lubricating oil composition is excellent in fuel saving properties and anti-wear properties even when it is used in a temperature environment of around 80° C. which is assumed to fall within a range where an engine is practically used.