If the load is large, choose a lubricant with a higher viscosity or a grease with a smaller penetration. All kinds of lubricating oil and grease have certain bearing capacity. Generally, the oil with large viscosity is not easy to be destroyed by the oil film of the friction pair. The low-speed heavy-duty friction pair in the boundary lubrication state should also consider the adhesion and extreme pressure of the lubricant.
Relative motion speed
For high-speed and light-duty sports pair, use less lubricating oil or grease with higher penetration; for high-speed rotating motion, consider the centrifugal force, and choose a lubricating oil with a higher viscosity within the allowable range of temperature rise. Grease with a small penetration; the speed of reciprocating motion and intermittent motion varies greatly, which is unfavorable for the formation of oil film. Lubricating oil should be selected.
Surface roughness
For the movement pair with high surface precision and small clearance, the lubricating oil with less viscosity should be used, especially the bearing clearance of the precision component main shaft, which is the main drug determining condition for determining the viscosity of the lubricating oil. For the motion pair with a rough surface, a grease with a higher viscosity or a grease with a smaller penetration degree should be used. When the hardness of the material rubbing against each other is low, the lubricating oil with a large viscosity should also be selected.
Working temperature and environment
When the working temperature is high, the lubricating oil with high flash point, high viscosity, good oxidation stability or grease with small penetration, high dropping point and high temperature resistance should be used. When the working temperature is low, the freezing point should be lower. Lubricating oil with low viscosity and less moisture or grease with high penetration and low temperature resistance; in working environment with corrosive medium, it should use lubricant with good anti-corrosion and anti-rust performance; in humid working environment In the working conditions where there is a lot of contact with water, a lubricating oil or grease with strong anti-emulsification ability and good oil resistance and anti-corrosion performance should be selected.
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