EV Lubricating Oil Composition for Cooling and Flash Point Balance
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Solution Overview
Problem
Lubricating oil compositions for electric vehicle devices face a trade-off between improving cooling performance and maintaining a high flash point, with reduced viscosity leading to lower flash points and compromised safety.
Innovation Solution
A lubricating oil composition comprising a base oil with specific properties, including a kinematic viscosity of 2.00 mm²/s to 4.00 mm²/s, a specific heat of 1.75 kJ/(kg ·K) or less, and a density of 0.850 g/cm³ or more, primarily containing ester-based synthetic oils, enhances cooling performance while ensuring electrical insulation and a high flash point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the viscosity of lubricating oil composition is reduced to improve cooling performance, then the cooling performance is improved, but the flash point tends to lower
Solution Approach 1:
The patent applies parameter changes by precisely controlling the kinematic viscosity within a specific range (2.00-4.00 mm²/s at 40°C) and adjusting the base oil composition to achieve both improved cooling performance and maintained flash point. This resolves the contradiction by finding an optimal parameter range that satisfies both requirements simultaneously.
Solution Approach 2:
The patent uses composite materials by formulating a lubricating oil composition containing multiple components including ester-based synthetic oils (30-100 mass%), other synthetic oils, and additives. This composite approach allows the oil to achieve both low viscosity for cooling and high flash point for safety by combining the properties of different materials.
2Temperature
If the density of lubricating oil composition is reduced to improve cooling performance, then the cooling performance is improved, but the electrical insulation may be compromised
Solution Approach 1:
The patent controls the density within a specific range (0.820-0.860 g/cm³) while simultaneously meeting electrical insulation requirements (volume resistivity ≥1.0×10¹² Ω·m). This parameter optimization resolves the contradiction by identifying a density range that provides both cooling efficiency and electrical insulation.
Solution Approach 2:
The composite lubricating oil formulation includes ester-based synthetic oils and other synthetic oils in specific proportions, creating a material that achieves both low density for cooling performance and high electrical insulation properties through the combined characteristics of its components.
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 superior cooling performance, electrical insulation, and safety with a high flash point, balancing viscosity, density, and thermal properties.
Implementation Method 1
the lubricating oil composition being superior in cooling performance
Implementation Method 2
ensuring electrical insulation
Data Source
AI summary
The invention addresses a problem of providing a lubricating oil composition which is superior in cooling performance, ensures electrical insulation and has a high flash point. The problem is solved by a lubricating oil composition containing a base oil (A), wherein the base oil (A) contains an ester-based synthetic oil (A1), the content of the ester-based synthetic oil (A1) is 30% by mass to 100% by mass based on the total amount of the base oil (A), the ester-based synthetic oil (A1) is one or more selected from the group consisting of an ester (A1-1) of a monohydric alcohol and a monobasic acid and an ester (A1-2) of a monohydric alcohol and a polybasic acid, and the base oil (A) satisfies the following requirements (1) to (3): Requirement (1): the kinematic viscosity at 40°C is 2.00 mm2/s to 4.00 mm2/s. Requirement (2): the specific heat at 20°C is 1.75 kJ/(kg ·K) or less. Requirement (3): the density at 20°C is 0.850 g/cm3 or more.