First of all, the basic function is lubrication. Lubricating oil forms an oil film on the tooth surface and bearings to prevent friction between gear parts and reduce wear. At the same time, the lubricating oil can also take away the friction pairs during the rotation process. The large amount of heat generated during intermittent movement prevents the gears and bearings from being burned; in addition, the lubricating oil has a good anti-rust and anti-corrosion function, which prevents the moisture and oxygen in the gear box from corroding the gear parts; the lubricating oil can also be taken away in the continuous flow process Impurities, to ensure the cleanliness of the gear box. In the selection process of lubricating oil, the viscosity index of lubricating oil is the primary criterion.
Viscosity refers to the resistance to fluid flow. For gear transmission systems, viscosity is the most important physical characteristic of lubricating oil. The lubricating oil must have suitable fluidity to ensure adequate lubrication for components at various temperatures. The decrease in viscosity in the use of lubricating oil is due to the selection of low-viscosity base oils and the selection of more polymer polymers to increase the viscosity. During the use of lubricating oil, under long-term high temperature and high pressure, The molecular chain of the high molecular hydrocarbon polymer is broken and the viscosity is reduced. Therefore, the degree of viscosity change is related to the quality of the lubricant.
Viscosity is the ability of lubricating oil to maintain its viscosity in various high and low temperature environments
As for what viscosity lubricating oil is used in the gearbox, it is related to the environmental climate and the working condition of the gearbox. For example, the temperature in the southern region is higher than that in the northern region, and the viscosity of lubricating oil used in the gearbox under the same working conditions in winter and spring and autumn is slightly higher. In addition, the higher the working temperature and the faster the speed of the gearbox, in order to maintain the stability of the high temperature oil film, the higher the oil viscosity is required.
In addition, to evaluate the quality of a lubricating oil, it mainly depends on its viscosity stability performance. The higher the viscosity, the thicker the oil film. It is suitable for high-speed, high-power and high-temperature gearboxes. The lower the viscosity, the thinner the oil film, which is suitable for low speed and low speed. Power, gearbox with low working temperature. But no matter the viscosity is high or low, the oil must have good oxidation resistance and anti-deterioration performance under high temperature conditions.
