Lubricating Oil Composition for Engine Fuel Efficiency
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Solution Overview
Problem
Conventional lubricating oils for internal combustion engines face challenges in reducing kinematic viscosity and high temperature high shear viscosity while maintaining low temperature viscosity and effectively reducing friction under mixed lubricating conditions, which hinders further improvement in fuel saving properties.
Innovation Solution
A lubricating oil composition comprising a base oil with a kinematic viscosity of 2 to 8 mm²/s, an overbased metallic detergent with an alkaline earth metal borate, and an organic molybdenum compound, specifically sulfurized molybdenum dithiocarbamate or sulfurized oxymolybdenum dithiophosphate, with a metal ratio greater than 2.5 and sulfated ash content between 0.1 to 1.5 percent by mass, to achieve reduced friction and improved fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the kinematic viscosity of lubricating oil is reduced to improve fuel saving properties, then fuel efficiency improves, but the low temperature viscosity deteriorates
Solution Approach 1:
The patent uses multi-grading technology to change the viscosity parameters of the base oil, creating a lubricating oil composition with a viscosity grade of 0W-20 or 0W-16. This allows the oil to maintain low viscosity at operating temperature for fuel efficiency while preserving adequate viscosity at low temperatures for proper lubrication.
Solution Approach 2:
The patent employs composite material formulation by combining specific base oils with viscosity index improvers and friction modifiers in precise proportions. This composite approach enables the oil to exhibit dual characteristics: low viscosity at high temperature for fuel economy and adequate viscosity at low temperature for protection.
2Loss of energy
If friction modifiers are added to reduce friction under mixed lubricating conditions, then fuel saving properties improve, but the compound structure becomes extremely complicated
Solution Approach 1:
The patent changes the chemical parameter of the friction modifier by selecting organic molybdenum compounds with specific molecular structures (formula 1 or 2) that have proven effective in reducing friction under mixed lubricating conditions while maintaining manageable structural complexity.
Solution Approach 2:
The patent applies local quality by concentrating the friction reduction function in specific organic molybdenum compounds that are added in controlled amounts (0.01-5 mass%), rather than using complex mixtures of multiple friction modifiers. This localized approach achieves effective friction reduction without excessive complexity.
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 composition achieves reduced kinematic and high temperature high shear viscosities, enhanced low temperature viscosity, and significant friction reduction, resulting in improved fuel saving properties suitable for various engines, including gasoline and diesel engines, while meeting severe exhaust gas regulations.
Implementation Method 1
an additive is adsorbed to the parts at which contact between solid bodies occurs to reduce the contact
Data Source
AI summary
The present invention provides a lubricating oil composition for internal combustion engines which can reduce sufficiently the friction under mixed lubricating conditions and is excellent in fuel saving properties. The lubricating oil composition comprises (A) a base oil having a 100°C kinematic viscosity of 2 to 8 mm2/s and an aromatic content of 10 percent by mass or less, (B) a metallic detergent having a metal ratio of 1.01 to 3.3 overbased with an alkaline earth metal borate, and (C) an organic molybdenum compound with a molybdenum concentration of 0.01 to 0.2 percent by mass on the basis of the total mass of the composition, and having a 100°C HTHS viscosity of 5.5 mPa·s or lower.