Lubricating Oil Composition for Integrated Electric Drive Modules
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Solution Overview
Problem
Conventional lubricating oils for electric motors and transmissions suffer from insufficient electrical insulation when oxidatively deteriorated, and inadequate anti-fatigue performance, making them unsuitable for use in integrated electric drive modules.
Innovation Solution
A lubricating oil composition comprising a lubricant base oil, calcium salicylate detergent, succinimide ashless dispersant, nitrogen-containing antioxidant, and optionally a nitrogen-containing friction modifier, which maintains balanced anti-fatigue performance and electrical insulation even when oxidatively deteriorated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional transmission oil is used for lubrication of electric motors, then anti-fatigue performance is improved, but electrical insulation of oxidatively deteriorated oil deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the lubricating oil by specifying precise ranges for metallic detergent (0.005-0.03 mass% as metal), sulfur content (0.003-0.05 mass%), and phosphorus content (0.003-0.06 mass%). These parameter adjustments optimize both anti-fatigue performance and electrical insulation properties of the oxidatively deteriorated oil.
Solution Approach 2:
The patent creates a composite lubricating oil formulation combining multiple additives with specific functions: metallic detergent for anti-fatigue performance, nitrogen-containing antioxidant for oxidation resistance, and friction modifier for controlled tribological properties. This composite approach achieves both anti-fatigue performance and maintained electrical insulation after oxidation.
2Reliability
If conventional electric motor oil is used for lubrication of transmissions, then electrical insulation is improved, but anti-fatigue performance deteriorates
Solution Approach 1:
The patent develops a universal lubricating oil composition that performs multiple functions simultaneously: lubrication of gear mechanisms (anti-fatigue performance), electrical insulation protection, and oxidation resistance. The formulated oil can be used for both electric motor lubrication and transmission lubrication, eliminating the need for separate oil systems.
Solution Approach 2:
The patent optimizes chemical composition parameters including sulfur content (0.003-0.05 mass%) and phosphorus content (0.003-0.06 mass%) to achieve a balance between anti-fatigue performance required for transmissions and electrical insulation properties required for electric motors.
3Reliability
If separate lubricating oil systems are used for electric motors and transmissions, then performance requirements are met, but device complexity increases
Solution Approach 1:
The patent merges the functions of separate electric motor lubrication and transmission lubrication into a single universal lubricating oil composition. This allows integration of electric motors and transmissions into combined drive modules while using one lubricating oil circulation system, reducing overall system complexity.
4Weight of moving object
If integrated electric drive module is implemented, then downsizing and weight reduction are achieved, but lubrication requirements become more complex
Solution Approach 1:
The patent creates a universal lubricating oil that adapts to multiple lubrication requirements within integrated electric drive modules. The oil formulation meets the diverse needs of electric motor bearings, gear mechanisms, and other moving parts, enabling downsizing and weight reduction while maintaining adequate lubrication performance.
Data Source
AI summary
A lubricating oil composition including: a lubricant base oil; (A) a calcium salicylate detergent in an amount of 0.005 to 0.03 mass % in terms of calcium on the basis of the total mass of the composition; (B) a succinimide ashless dispersant in an amount of 0.005 to 0.25 mass % in terms of nitrogen on the basis of the total mass of the composition; (C) a nitrogen-containing antioxidant in an amount of 0.005 to 0.15 mass % in terms of nitrogen on the basis of the total mass of the composition; and optionally (D) a nitrogen-containing friction modifier in an amount of no more than 0.03 mass % in terms of nitrogen on the basis of the total mass of the composition, wherein a total content of any metallic detergent is 0.005 to 0.03 mass % in terms of metal on the basis of the total mass of the composition.