The safety of bearing grease is very important for rolling bearings. It is generally recommended to use a thicker grease No. 3 instead of a less thick grease. On the contrary, in order to reduce the chaos of the bearing, especially the start-up and chaos, for bearings with low ordinary speed, it is better to use low-consistency grease.
The plastic viscosity of the grease is greater than the viscosity of the base oil, and the grease film has a clear elasticity, so its load resistance is greater than that of the base oil. Only the viscosity of the base oil is appropriate, and the resistance of the grease is not fruitful. Under the condition of boundary lubrication or extreme pressure lubrication, it mainly relies on additives to improve the wear resistance and extreme pressure function, and meet the requirements of lubrication conditions.
Proper use of grease requires knowledge of the movement of the grease in the bearing. The movement of the grease filled in the rolling bearing can be roughly divided into two stages as the bearing rotates. Under normal circumstances, the amount of grease filled in the bearing always exceeds the theoretical demand for direct participation in lubrication. In the initial stage of the bearing crucible, most of the grease is squeezed out quickly (less than one minute). And accumulate in the cavity of the support frame and the bearing cover, and form a contour at the center of the rolling element. In this process, the bearing temperature rises rapidly due to the resistance of excess grease. Although most of the excess grease is squeezed out at the beginning of the run, the grease that is squeezed into the raceway attachment can still be brought between the raceways by the rolling element. These greases are discharged in large quantities as they circulate with the bearing rotor. At this time, the bearing temperature continues to rise until the excess grease is completely discharged, which can be called the grease's walking phase. According to the grease quality and filling amount in the bearing structure, this time can last for ten minutes. Even a few hours.
After the remaining grease is completely discharged, the remaining large amount of grease forms a thin layer of grease film on the mutual contact surface of the rolling element, the raceway and the holding frame, thereby entering the normal stage of the bearing. . At this point the temperature gradually drops and reaches a balanced shape. That is to say, the temporary lubrication is mainly borne by this layer of grease film. In addition, during the temporary operation of the bearing, the contour of the rolling element and the raceway and the grease on the support frame are shrunk to separate a part of the base oil, and after flowing into the raceway, the lubrication is also supplemented.
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