Lubricating oil composition for electric vehicle gearbox and preparation method of lubricating oil composition

Abstract

The invention discloses a lubricating oil composition for an electric vehicle gearbox and a preparation method of the lubricating oil composition. The composition is prepared from the following components in percentages by weight: 79.8 to 84.5% of base oil, 4 to 7% of polymethacrylate viscosity index improver, 10 to 13% of special complexing agent for transmission oil and 0.3 to 0.5% of pour pointdepressant, wherein the polymethacrylate viscosity index improver is a comb-shaped polymer, and a shear stability index of the polymethacrylate viscosity index improver KRL 20h is not greater than 28. The lubricating oil composition for the electric vehicle gearbox and the preparation method have the advantages that prepared oil maintains viscosity unchanged under long-term high-speed shearing force, provides reliable protection for the electric vehicle gearbox, has excellent shear stability, outstanding low-temperature rheological property, and capability of greatly increasing high-temperature thickening ability of the oil with low dosage, has good dispersibility, can reduce deposition of oil oxides, and can be used together with a special complexing agent for gearbox to improve cleaningand dispersion performance of the oil.

Description

technical field [0001] The invention belongs to the field of lubricating oil, and in particular relates to a lubricating oil composition for an electric vehicle gearbox and a preparation method thereof. Background technique [0002] The electric vehicle industry is a rapidly developing emerging industry, with different levels of development at home and abroad. The industry is still immature and not standardized. The technology is constantly seeking improvement and breakthroughs, and relevant policies are also being adjusted. According to different technical routes, electric vehicles can be divided into traditional (oil-electric / gas-electric) hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), pure electric vehicles (AEV) and fuel cell vehicles (FCV). Electric vehicles will become the inevitable trend of the development of my country's automobile industry, and also the main direction of future transformation and development of the automobile industry. ...

AI Technical Summary

Problems solved by technology

[0004] Judging from the particularity of the above-mentioned electric vehicle transmission system and the high requirements for oil products, the traditional transmission oil is far from meeting the requirements, which requires the use of specific formula technology to develop special transmission oil for electric vehicles to Meet the demand for gearbox oil and the protection of the transmission system for the development of electric vehicles

At present, there are few public reports on lubricating oil for electric vehicle gearboxes at home and abroad. CN 105132107A, CN104560297A and CN 105087113A all introduce a lubricating oil composition for electric vehicle gearboxes or transmission systems. Among them, CN 105132107A and CN104560297A are mainly aimed at single-stage gearboxes, which cannot meet the requirements of two-stage or multi-stage gearboxes

The oil product reported in CN105087113A has good anti-wear and anti-friction characteristics, oxidation stability, etc., but it cannot provide good protection against extreme pressure gears and viscosity retention of oil products for gearboxes with large input torque and high speed

In addition, none of the above patents involves the compatibility of oil products to seals, low temperature rheology and electromagnetism

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