Outstanding lubrication performance, solidifying the foundation of power transmission.

Within the highly precise and complex mechanical architecture of a continuously variable transmission (CVT), the lubrication performance of CVTF transmission fluid stands as a critical factor in ensuring its efficient and stable operation. Thanks to its unique molecular structure and rheological properties, it rapidly forms a uniform, stable boundary lubrication film with high shear strength at the mating and sliding interfaces of dynamically coupled components—such as planetary gear sets, drive shafts, and various bearings. Based on the principles of hydrodynamic lubrication and elastohydrodynamic lubrication, this lubricant film effectively compensates for surface roughness at the microscopic level, significantly reducing the coefficient of friction between parts. In accordance with the law of conservation of energy, it markedly diminishes energy losses caused by frictional heat generation. Moreover, by lowering surface contact stresses, it mitigates component wear, delaying failure mechanisms—including material fatigue and abrasive wear—across multiple dimensions, thereby substantially extending the overall service life of the transmission. Taking the steel belt–pulley pair—a quintessential power‑transmission interface in CVTs—as an example, precisely optimized lubrication conditions ensure slip‑free, highly efficient power transfer, while preventing issues such as belt creep and micro‑fatigue damage to the pulley surface that can arise from uneven friction, thus maintaining both the stability and efficiency of power transmission.

Superior wear resistance, safeguarding core components.

Inside the transmission, critical load-bearing components such as gears and bearings endure severe operating conditions—high loads, high rotational speeds, and complex cyclic stresses—experiencing substantial Hertzian contact stresses and intense frictional shear forces. CVTF continuously variable transmission fluid must exhibit exceptional anti‑wear performance; through its formulation containing organic molybdenum, borates, and other extreme‑pressure and anti‑wear additives, it forms a dense, nanoscale protective film on metal surfaces via physical adsorption and chemical reactions. This film boasts high hardness, a low coefficient of friction, and excellent toughness, enabling it to effectively resist various wear mechanisms—including abrasive wear, adhesive wear, and fatigue wear—under extreme operating conditions such as heavy‑load starts, rapid acceleration, high‑speed cruising, and frequent stop‑and‑go cycles. By maintaining component dimensional accuracy, geometric tolerances, and surface micro‑topography within design specifications, it ensures reliable operation, significantly reducing maintenance frequency and component replacement costs while enhancing equipment reliability and cost‑effectiveness.

Stable friction characteristics for a smooth and comfortable driving experience.

Under urban congestion, with frequent gear shifts, or during high‑speed cruising at elevated engine speeds, the CVTF continuously variable transmission fluid must maintain stable friction characteristics to ensure reliable power transmission and smooth shifting across a wide range of operating conditions. From a tribological perspective, its coefficient of friction must remain within an extremely narrow and consistent range, preventing shift shocks and power interruptions caused by fluctuations in friction. This not only enhances driving comfort from an ergonomic standpoint but also reduces dynamic loads on the drivetrain from a mechanical dynamics perspective, minimizing component fatigue and extending the overall service life of the transmission, thereby delivering a smoother, more enjoyable driving experience.

Wide-temperature-range adaptability, confidently handling extreme operating conditions.

1. Low-Temperature Fluidity and Rapid Response Mechanism In cold environments, the transmission faces significant challenges at the moment of vehicle start-up. At this critical juncture, the low‑temperature fluidity of CVTF continuously variable transmission fluid becomes a key performance indicator. In accordance with standards such as ASTM D97, which specify requirements for pour point and low‑temperature pumpability viscosity, the fluid must exhibit an exceptionally low pour point and outstanding low‑temperature rheological properties. This ensures that, even in freezing conditions, it can swiftly overcome intermolecular van der Waals forces, flow rapidly at low viscosity, and—based on principles of fluid dynamics—quickly reach every corner of the transmission, providing prompt and adequate lubrication to all components. As a result, vehicles can start easily in extremely cold regions, gear shifts remain smooth and unimpeded, and issues such as sluggish or jerky shifting caused by the sharp increase in oil viscosity and reduced fluidity at low temperatures are effectively prevented.

2. High-Temperature Stability and Long-Lasting Protective Performance When a vehicle is driven at high speeds for extended periods or operated in high-temperature environments, the transmission oil temperature can rise sharply. Under such high‑temperature conditions, CVTF continuously variable transmission fluid must exhibit exceptional thermal stability. From a chemical kinetics perspective, its base oil should possess high thermal‑oxidative stability, while its additives must demonstrate excellent high‑temperature compatibility and resistance to thermal decomposition, ensuring that no oxidation, polymerization, or additive breakdown occurs at elevated temperatures, thereby maintaining the fluid’s chemical composition and structural integrity. Meanwhile, in accordance with viscosity–temperature relationships, the formulation should incorporate an appropriate blend of base oils and viscosity index improvers to sustain an optimal viscosity, preventing viscosity loss and degraded lubrication performance as oil temperature increases. This ensures that, even under high‑temperature conditions, the transmission continues to operate reliably, providing dependable power transmission for the vehicle.

High-efficiency anti-foaming performance ensures transmission efficiency.

During high-speed operation of the transmission, the lubricant undergoes intense mechanical agitation, and, in accordance with the physicochemical principles governing the gas–liquid interface, it readily entrains air, forming foam. CVTF continuously variable transmission fluid must exhibit excellent anti‑foaming performance. By incorporating anti‑foaming additives such as organosilicon compounds and polyethers, these agents leverage their surface‑active properties to reduce interfacial tension, swiftly suppress foam formation, and, through defoaming mechanisms, rapidly dissipate any foam that has already developed. The presence of foam can severely compromise the effective volume and lubrication characteristics of the fluid; according to continuum mechanics, this leads to a reduction in the load‑carrying capacity of transmission components and may even trigger serious failures such as slippage or scuffing. By contrast, superior anti‑foaming properties help maintain a stable oil‑film thickness, ensuring that the transmission’s lubrication and power‑transmission efficiency remain unaffected and that its reliable operation is safeguarded.

Strong cleaning and dispersing power, maintaining a clean internal environment.

During prolonged operation, the transmission inevitably accumulates contaminants such as metal debris, sludge, and carbon deposits. CVTF continuously variable transmission fluid must possess robust detergency and dispersancy; through its formulation of detergents and dispersants, and in accordance with colloid chemistry principles, it uniformly disperses these impurities into the oil as nano‑sized particles, preventing them from settling and agglomerating within the transmission to form large particulate contaminants. These dispersed impurities are removed during routine transmission‑oil changes, effectively averting issues like oil‑line blockages and accelerated wear caused by contaminant buildup, thereby maintaining a clean internal environment and ensuring the proper functioning of all transmission components.

Perfect compatibility, ensuring sealing reliability.

CVTF continuously variable transmission fluid must achieve perfect chemical and physical compatibility with the various sealing materials inside the transmission, such as nitrile rubber, fluoroelastomer, and polyurethane. Based on polymer‑material compatibility theory, it must not cause any adverse effects—such as chemical corrosion, swelling, or hardening—to the seals, thereby ensuring the stability of their chemical structure and physical properties and maintaining optimal elasticity and sealing performance at all times. Only in this way can the transmission’s sealing integrity be guaranteed, oil leakage prevented, normal internal pressure and operating conditions sustained, and stable transmission operation ensured.