Lubricating Oil Composition for Engine Fuel Saving and Heat Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lubricating oils for internal combustion engines face increased burden due to miniaturization and higher output demands, requiring improved fuel saving and heat resistance properties, especially in turbochargers where high temperatures exacerbate viscosity and evaporation issues.
Innovation Solution
A lubricating oil composition using a mixed base oil with a high viscosity index, combining mineral and synthetic oils, and incorporating a calcium salicylate-based detergent and organic molybdenum compound to enhance fuel saving and heat resistance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the viscosity of lubricating oils is lowered to improve fuel saving property, then fuel saving property is improved, but heat resistance property and lubrication property at high temperature deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the base oil by specifying precise ranges of saturated components (90-99 mass%), cyclic saturated components (≤40 mass%), and bicyclic or greater saturated components (5-60 mass%). It also defines specific viscosity index ranges (110-160) and iodine value constraints (≤2.5 g I2/100g) to achieve optimal balance between fuel saving and heat resistance properties
Solution Approach 2:
The patent creates a composite base oil structure by combining multiple saturated hydrocarbon components with specific molecular structures. The base oil comprises a mixture of paraffinic, naphthenic, and aromatic hydrocarbons in controlled proportions, forming a composite material that simultaneously provides low viscosity for fuel efficiency and high thermal stability for heat resistance
2Use of energy by moving object
If the viscosity of lubricating oils is lowered to improve fuel saving property, then fuel saving property is improved, but evaporation property increases
Solution Approach 1:
The patent controls evaporation by adjusting the molecular weight distribution and saturation level of hydrocarbon components. It specifies that saturated components should constitute 90-99 mass% of the base oil, with particular emphasis on bicyclic or greater saturated components (5-60 mass%), which provide higher evaporation stability while maintaining low viscosity
Solution Approach 2:
The base oil is designed as a composite of different hydrocarbon classes (paraffinic, naphthenic, aromatic) with complementary properties. The combination of saturated cyclic components with specific ring structures creates a material that resists evaporation while maintaining fluidity for fuel efficiency
3Productivity
If internal combustion engines are miniaturized with higher output to increase productivity, then productivity is improved, but the burden on lubricating oils increases
Solution Approach 1:
The patent adjusts the viscosity index parameter to a specific range (110-160) to ensure the lubricating oil maintains appropriate viscosity under the increased mechanical burden of miniaturized high-output engines. It also controls the kinematic viscosity at 100°C within specific ranges to balance film strength and flow characteristics
Solution Approach 2:
The lubricating oil is formulated as a composite material with enhanced load-bearing capacity through the inclusion of sulfurized olefin (0.1-5 mass%) and specific additive packages. The base oil composition (90-99% saturated components) provides inherent film strength to handle the increased mechanical stresses in compact engines
Data Source
AI summary
The invention relates to a lubricating oil composition for an internal combustion engine excellent in fuel saving property and heat resistance property, more specifically to a lubricating oil composition for an internal combustion engine containing a mixed base oil (AB) comprising a mixture of a base oil (A) being a mineral oil and/or a synthetic oil with a kinematic viscosity at 100°C of not more than 3.5 mm2/s and a base oil (B) being a mineral oil and/or a synthetic oil with a kinematic viscosity at 100°C of more than 3.5 mm2/s, wherein the ratio of the base oil (A) to the entire base oil is not more than 40 mass%, a calcium salicylate-based detergent (C) in 0.05 mass% to 0.5 mass% as a calcium amount based on the total amount of the composition, and a calcium sulfonate-based detergent (D) in 0.002 mass% to 0.2 mass% as a calcium amount based on the total amount of the composition.