1. Reduce friction and wear: In the mutual contact parts of the rings, rolling elements and retainers that constitute the bearing, prevent metal contact and reduce friction and wear.

2. Extend the fatigue life: The rolling fatigue life of the bearing will be extended when the rolling contact surface is well lubricated during rotation. Conversely, if the oil viscosity is low and the lubricating oil film thickness is not good, it will be shortened.

3. Discharge frictional heat and cooling: the circulating oil supply method can use oil to discharge the heat generated by friction, or the heat from the outside, and cool it. Prevent the bearing from overheating and prevent the aging of the lubricating oil itself.

4. Others: It also has the effect of preventing foreign objects from invading the inside of the bearing, or preventing rust and corrosion.

Lubrication method

At present, the lubrication methods of bearings mainly include grease lubrication and oil lubrication. In order to make the bearing function well, first of all, it is necessary to select a lubrication method suitable for the conditions of use and the purpose of use. If only lubrication is considered, the lubricity of oil lubrication is dominant.

However, grease lubrication has the advantage of simplifying the structure around the bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication.