Lubricating Base Oil Saturated Composition for Fuel Efficiency
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Solution Overview
Problem
Conventional lubricating oils for internal combustion engines and power train devices face limitations in viscosity-temperature characteristics, heat and oxidation stability, and lubricity, particularly when viscosity is reduced to improve fuel efficiency, leading to reduced antiwear properties and fatigue life.
Innovation Solution
A lubricating base oil with 90% or greater saturated components and 10.5-40% cyclic saturated components, combined with specific additives such as ashless antioxidants and organic molybdenum compounds, to enhance viscosity-temperature characteristics and maintain additive functionality even at reduced viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the viscosity of lubricating oil is reduced to improve fuel efficiency, then energy consumption decreases, but lubricity (antiwear property, anti-seizing properties, fatigue life) deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the lubricating base oil by specifying precise ranges of saturated components (85-95 mass%), cyclic saturated components (5-30 mass%), and aromatic components (3-15 mass%). This compositional parameter adjustment enables the oil to maintain optimal viscosity and lubricity characteristics while allowing for reduced viscosity formulations that improve fuel efficiency without sacrificing protective properties.
Solution Approach 2:
The invention creates a composite lubricating base oil formulation by combining multiple hydrocarbon components (saturated, cyclic saturated, and aromatic components) in specific proportions. This composite approach allows the oil to exhibit synergistic properties where the combination of components provides both the reduced viscosity needed for fuel efficiency and the sufficient lubricity for reliability, resolving the contradiction between these two opposing requirements.
2Reliability
If phosphorus-based extreme-pressure agents are added to guarantee antiwear property in low viscosity lubricating oils, then antiwear property improves, but fatigue life shortens significantly
Solution Approach 1:
The invention adjusts the base oil composition parameters to reduce dependence on phosphorus-based additives. By optimizing the content of saturated components and cyclic saturated components, the base oil itself provides sufficient lubricity, allowing extreme-pressure agent content to be reduced to 0.01-0.5 mass% and sulfur-containing extreme-pressure agent content to be limited to 0.01-0.1 mass%, thereby preserving fatigue life while maintaining antiwear protection.
Solution Approach 2:
The invention extracts the lubricity function from additive-dependent mechanisms and embeds it directly into the base oil molecular structure through careful selection of saturated and cyclic saturated hydrocarbons. This extraction reduces reliance on phosphorus-based extreme-pressure agents, allowing their content to be minimized while still achieving adequate antiwear properties without compromising fatigue life.
3Stability of the object's composition
If conventional base oils are used with additives to improve heat and oxidation stability, then stability improves, but viscosity-temperature characteristics and lubricity remain insufficient
Solution Approach 1:
The invention formulates a composite base oil consisting of three distinct hydrocarbon components (saturated, cyclic saturated, and aromatic) in specifically controlled proportions. This composite structure provides inherent heat and oxidation stability through the saturated components while the cyclic saturated components contribute to lubricity and viscosity-temperature characteristics, eliminating the need to choose between stability and performance.
Solution Approach 2:
The invention assigns different functional qualities to different components within the base oil: saturated components (85-95 mass%) provide heat and oxidation stability, cyclic saturated components (5-30 mass%) enhance lubricity and viscosity-temperature characteristics, and aromatic components (3-15 mass%) supplement overall performance. This local quality differentiation allows each component to optimize specific properties, achieving comprehensive performance improvement simultaneously.
Data Source
AI summary
The lubricating base oil of the invention satisfies at least one of conditions (a) or (b) below. The lubricating oil composition for an internal combustion engine according to the invention comprises the lubricating base oil of the invention, an ashless antioxidant containing essentially no sulfur as a constituent element, and at least one compound selected from among ashless antioxidants containing sulfur as a constituent element and organic molybdenum compounds. Also, a lubricating oil composition for a power train device according to the invention comprises the lubricating base oil of the invention, a poly(meth)acrylate-based viscosity index improver and a phosphorus-containing compound. (a) The saturated component content is 90 % by mass or greater, and the proportion of cyclic saturated components among the saturated components is 10-40 % by mass. (b) The condition represented by the following formula (1) is satisfied. 1.440≤n20-0.002×kv100≤1.453 [wherein n20 represents the 20°C refractive index of the lubricating base oil, and kv100 represents the kinematic viscosity at 100°C (mm2/s) of the lubricating base oil.]