Automobile continuously variable transmission fluid and preparation method thereof

Abstract

The invention discloses an automobile continuously variable transmission fluid and a preparation method thereof. The automobile continuously variable transmission fluid comprises the following components: 100 parts by weight of class III base oil, 1-3 parts by weight of antiwear agent, 5-15 parts by weight of viscosity index improver, 0-1 part by weight of pour point depressant, 0.5-2.5 parts by weight of alkaline earth clearing agent, 2-6 parts by weight of dispersant, 0.5-1 part by weight of antioxidant, 1-4 parts by weight of friction modifier and 0.01-0.05 part by weight of anti-foaming agent. According to the invention, the chosen additives are optimally combined together to obtain the CVTF, and the obtained CVTF has excellent comprehensive properties; the CVTF is excellent in viscosity index, oxidation stability, shear stability, wearing quality and cryogenic property, and more critically, large in torque, high in traction coefficient and high in transmission efficiency; and consequently, the use requirements of B-CVT and T-CVT can be met simultaneously.

Description

technical field [0001] The invention belongs to the field of automobile transmission lubricating oil, in particular to an automobile continuously variable transmission transmission oil and a preparation method thereof. Background technique [0002] In recent years, compared with other automotive transmissions, CVT has the advantages of better fuel economy, less exhaust emissions, more comfortable ride, and lower cost. Therefore, more and more cars adopt CVT design. As a kind of friction transmission oil, CVTF has always been the core problem of transmission torque and transmission efficiency that plagued the development of CVT (the matching effect of transmission oil and automobile transmission has a great impact on transmission efficiency, which can range from 45% to 97%). The friction coefficient between large transmission parts is an effective way to solve this problem, which objectively promotes the development of lubricating oil for CVT, that is, continuously variable t...

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Problems solved by technology

[0004] However, domestic research on CVT is relatively late, and research on CVTF is seldom. There is only one CN100448964C patent report on transmission fluid for continuously variable transmissions. It mainly studies the base oil synthesis and formula research of CVTF. High viscosity index and low temperature fluidity

The transmission fluids in these domestic and foreign patents all use the traction coefficient to evaluate the performance of CVTF. Whether it can truly reflect the application performance of CVTF in the actual working conditions of CVT, especially the transmission efficiency, is worth discussing. In addition, the current Some patents only evaluate some simple indicators of CVTF, such as viscosity index, low temperature performance, and viscosity, and they are different. More importantly, they do not evaluate the key indicators of CVTF, such as transmission efficiency, oxygen resistance, shear stability, etc. For evaluation, the comprehensive performance of CVTF given by some patents cannot meet the special requirements of continuously variable transmissions

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