CN-121991745-A - Multi-gear gearbox lubricating oil composition and preparation method and application thereof

Abstract

The invention belongs to the field of lubricating oil, and particularly relates to a lubricating oil composition for a multi-gear gearbox, and a preparation method and application thereof. The lubricating oil composition for the multi-gear gearbox comprises, by mass, 2.0% -4.5% of viscosity index improver, 0.01% -0.08% of detergent, 4.5% -7.0% of dispersant, 0.3% -1.0% of extreme pressure antiwear agent, 0.05% -0.3% of rust inhibitor, 0.3% -1.5% of antioxidant, 0.01% -0.2% of metal passivator, 0.3% -1.5% of cross-linking agent, 0.01% -0.03% of anti-foaming agent and the balance of base oil. The crosslinking agent of the composition adopts trimethylolpropane tri (1H-imidazole-1-acetate), so that the abrasion resistance of the oil product is effectively enhanced, the friction coefficient is reduced, the friction durability is improved, and the effects of prolonging the endurance mileage and prolonging the service life of hardware are achieved.

Inventors

• ZHAO ZHIYU
• XU JINGJING
• ZHANG WEIGUANG
• JIANG YU
• HUANG DONGSHENG
• LI YUAN
• DI ZECHAO
• LIU XIAOLEI
• SUN SHUBO

Assignees

• 中国石油天然气股份有限公司

Dates

Publication Date

20260508

Application Date

20241106

Claims (14)

1. 1. The multi-gear gearbox lubricating oil composition is characterized by comprising, by mass, 2.0% -4.5% of viscosity index improver, 0.01% -0.08% of detergent, 4.5% -7.0% of dispersant, 0.3% -1.0% of extreme pressure antiwear agent, 0.05% -0.3% of antirust agent, 0.3% -1.5% of antioxidant, 0.01% -0.2% of metal passivating agent, 0.3% -1.5% of cross-linking agent, 0.01% -0.03% of anti-foaming agent and the balance of base oil.
2. 2. The multi-speed transmission lubricating oil composition of claim 1, wherein the viscosity index improver is a polymethacrylate.
3. 3. The multi-speed transmission lubricating oil composition of claim 1, wherein the detergent is selected from one or both of a high base number sulfurized alkylphenol salt and a thiosulfate salt.
4. 4. The multi-speed transmission lubricating oil composition of claim 1, wherein the dispersant is bis-succinimide.
5. 5. The multi-speed transmission lubricating oil composition of claim 1, wherein the extreme pressure antiwear agent is a mixture of dialkyl dithiophosphate and butyl triphenyl thiophosphate.
6. 6. The multi-speed transmission lubricating oil composition of claim 5, wherein the mass ratio of dialkyldithiophosphate to butyltriphenyl thiophosphate is 4 to 6:1.
7. 7. The multi-speed transmission lubricating oil composition of claim 1, wherein the rust inhibitor is selected from one or both of dodecenyl succinic acid and alkenyl succinic acid half esters.
8. 8. The multi-speed transmission lubricating oil composition of claim 1, wherein the antioxidant is selected from one or both of octyl/amyl diphenylamine, octyl substituted diphenylamine and high molecular weight phenolic antioxidants.
9. 9. The multi-speed transmission lubricating oil composition of claim 1, wherein the metal deactivator is a 2, 5-dithio-1, 3, 4-saixadiazole derivative.
10. 10. The multi-speed transmission lubricating oil composition of claim 1, wherein the cross-linking agent is trimethylolpropane tris (1H-imidazole-1-acetate).
11. 11. The multi-speed transmission lubricating oil composition of claim 1, wherein the anti-foaming agent is a silicon-type and non-silicon type compound T922.
12. 12. The multi-speed transmission lubricating oil composition of claim 1, wherein the base oil is one or more of a group II hydrogenated base oil and a group III hydrogenated base oil.
13. 13. A method of preparing a multi-speed transmission lubricating oil composition according to any one of claims 1 to 12, comprising the steps of: Adding the base oil into a blending kettle, adding the rest raw materials, and stirring for 2-3 hours at 65-75 ℃ to obtain the multi-gear gearbox lubricating oil composition.
14. 14. Use of a multi-speed transmission lubricating oil composition according to any one of claims 1 to 12 for the preparation of a transmission lubricating oil.

Description

Multi-gear gearbox lubricating oil composition and preparation method and application thereof Technical Field The invention belongs to the field of lubricating oil, and particularly relates to a lubricating oil composition for a multi-gear gearbox, a preparation method and application thereof, and more particularly relates to a lubricating oil composition for a AT, CVT, DCT gearbox containing a wet clutch and a hybrid DHT gearbox, and a preparation method and application thereof. Background Hybrid vehicles have gained consumer favor by combining the dual advantages of an internal combustion engine and an electric motor. The special DHT gearbox for the hybrid electric vehicle type needs to perform speed reduction and torque increase operation on power provided by an engine and a motor, and in the process of driving the vehicle by two types of power, the gearbox usually uses a group of wet clutches to interrupt and switch a power source so as to ensure smoothness and stability in the using process of the vehicle. In addition to the conventional AT, CVT, DCT gear boxes, the market share of the automatic gear boxes with wet clutches on the market is greatly increased. In order to better adapt to the performance requirements of different OEMs on the oil products of the gearbox, in the development of the formula, balancing the compatibility relationship among all additives is an important link in the development of the oil products, and meanwhile, the requirements of working conditions of high rotating speed and full service life are met, and the bearing capacity of the lubricating oil on gears and bearings and the performance requirements of long service life are enhanced. Based on this, there is a need for a transmission oil product that combines the properties of load bearing capacity, friction durability, and the like. The Chinese patent application CN108218835A discloses a preparation method of an extreme pressure antiwear agent and application of the extreme pressure antiwear agent in new energy electric automobile gearbox oil, and adopts 2-pyrrole dithioacetamido, a detergent, an ashless dispersant and hydrogenation base oil for blending, so that the product has low viscosity, small friction force and low oil loss, and corrosion to metal is far lower than that of similar products in the market. Chinese patent application CN113930275A discloses a lubricating oil for a hybrid power reduction gearbox of an oil-cooled motor and application thereof. The lubricating oil comprises the following components in percentage by weight, namely alkyl polysulfide, phosphorus-containing antiwear agent, viscosity index improver, pour point depressant, detergent dispersant, antioxidant, rust inhibitor, metal deactivator, anti-foaming agent, hydrogenated base oil and the balance of synthetic oil, wherein the alkyl polysulfide is polyalkylbenzyl sulfide T324, the phosphorus-containing antiwear agent is selected from the combination of zinc dialkyl dithiophosphate T204, phosphorothioate Irgalube and phosphite T304, the hydrogenated base oil is III hydrogenated base oil, the synthetic oil is poly-a-olefin synthetic oil, and the viscosity index improver is polymethacrylate. The lubricating oil has the advantages of low viscosity, good compatibility with copper parts and low metal corrosiveness. Chinese patent application CN105132107A discloses a lubricating oil composition for a gear box of a pure electric vehicle, which comprises the following components, by weight, of a) at least one viscosity index improver 0.5-25%, b) at least one extreme pressure antiwear agent 0.05-10%, c) at least one antioxidant 0.5-5%, and d) base oil in balance. The composition provided by the invention can meet the lubricating requirements of gears and bearings in a pure electric vehicle gearbox, and the obtained lubricating oil has excellent low-temperature performance, extreme pressure wear resistance, oxidation resistance, rust prevention and corrosion resistance, excellent comprehensive performance, simple components and simple manufacturing process. None of the above inventions relates to the application of trimethylolpropane tris (1H-imidazole-1-acetate) in the lubricating oil of a multi-gear gearbox containing wet clutches, and no related report is found. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a multi-gear gearbox lubricating oil composition, and a preparation method and application thereof. The additive and the lubricating oil composition are used for improving the mechanical protection performance and the friction durability of a multi-gear gearbox containing a wet clutch, and a crosslinking agent in the composition adopts trimethylolpropane tris (1H-imidazole-1-acetate), so that the wear resistance of an oil product is effectively enhanced, the friction coefficient is reduced, the friction durability is improved, and the effects of prolonging the endurance mileage and prolonging the service life