Usually the bearing is used in conjunction with the shaft, the bearing inner sleeve is installed with the shaft, and the bearing outer sleeve is installed with the bearing seat. If the inner sleeve rotates with the shaft, the inner sleeve and the shaft adopt a close fit, and the bearing outer sleeve and the bearing body adopt a clearance fit; on the contrary, if the bearing body and the bearing outer sleeve rotate together, the bearing outer sleeve and the bearing body adopt a tight fit, and the bearing inner sleeve It adopts a clearance fit with the shaft. Running lap failures often occur during operation, which requires analysis and processing, otherwise it will cause accidents and cause greater losses.

Bearing running circle is a common fault, and there are many reasons for running circle. The first is improper fit. We know that the running bearing will produce heat. There is a temperature difference between the shaft and the inner sleeve, outer sleeve and the bearing body. These temperature differences will cause changes in the tightness of the fit. With the extension of time, wear will occur, the running circle will inevitably emit more heat, the temperature of the NTN bearing body will rise, once the bearing body expands, the bearing clearance disappears, The inner and outer sleeves become one body. As the shaft rotates, the bearing sleeve rotates on the bearing body and generates a lot of heat. An accident occurs and the inner hole of the bearing body is also worn out. This is the lap caused by the improper fit due to the temperature difference.