Ester Base Oil for Electric Vehicle Gearboxes

The patent changes the chemical composition parameters of the base oil by incorporating specific ester compounds (formula I) with controlled molecular structures (R groups, m values, and X alkyl moieties). This compositional parameter change simultaneously improves energy efficiency through reduced traction and enhances thermal management through improved thermal conductivity and oxidation stability, resolving the contradiction between energy efficiency and thermal management capability.

The patent creates a composite lubricant formulation by combining specifically structured ester compounds (formula I) with conventional base oils and additives. The ester component provides superior traction properties through its molecular structure (controlled R groups, m ratios, and X alkyl chains), while the composite nature of the formulation integrates multiple functional components to achieve both improved traction and acceptable formulation complexity.

The patent changes the base oil composition from conventional mineral oils to specifically structured ester compounds (formula I) with controlled molecular parameters. This parameter change improves oxidation stability through the ester functional groups and enhances volatility resistance through appropriate molecular weight selection (controlled by R groups and m values), while the synthesis route remains cost-effective compared to more complex synthetic alternatives.

The patent creates a composite oil system combining ester base stocks with viscosity modifiers and additives. The ester component provides long service life through superior oxidation stability, while the composite formulation includes viscosity index improvers that maintain fluidity at low temperatures. This composite approach allows the oil to achieve both extended service life and acceptable low-temperature fluidity.