Proper use of bearing grease requires knowledge of the movement of the grease in the bearing. Guarantee the stability of the grease. The movement of the grease filled in the rolling bearing can be roughly divided into two stages as the SKF bearing rotates.
By the way, by the way, when lubricating the bearing, pay attention to the amount of grease. For details, please refer to the article "Introduction of the amount of grease used in lubrication of SKF bearings".
In general, the amount of grease in the SKF bearing always exceeds the actual amount of lubrication directly involved in the lubrication, on the frame and in the cavity of the bearing cover, and forms a contour on the periphery 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 may still be carried by the rolling element into the raceway. In the initial stage of the bearing crucible, most of the grease is squeezed out of the raceway very quickly (less than one minute), and the accumulated grease is discharged a small amount while circulating along with the bearing rotating body. At this time, the bearing temperature continues to rise until the excess bearing grease is completely discharged, which can be called the walking phase of the grease. According to the grease quality and filling amount in the bearing structure, this time may last for more than ten. Minutes, even hours.
After the remaining bearing grease is completely discharged, the remaining small amount of grease forms a thin layer of grease film on the mutual contact surface of the rolling element, the raceway and the cage, thereby entering the normal bearing of the bearing. stage. At this time, the temperature gradually drops and reaches equilibrium. In other words, long-term lubrication is mainly borne by this layer of grease film. In addition, during the long-term operation of the bearing, the contour of the rolling element and the raceway and the grease on the cage are shrunk to separate a part of the base oil, and after flowing into the raceway, the lubrication is also supplemented. .
Different bearing greases are not the same in the contours of the bearings. It is necessary to form a contour that is relatively straightforward. The running time is short. In the long-term operation, the bearing temperature is low and stable. This is an ideal one. Grease is especially important for grease channeling.
Some so-called eddy-flow greases are not easy to form contours, and even if they are contoured, they are easy to collapse. At this time, the excess grease repeatedly returned to the raceway is in a state of being strongly stirred for a long time, and the bearing torque is large and the temperature is high. Unbalanced, noise may also be generated, and grease is also prone to deterioration and loss.
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