In order to prevent overheating faults in the bearings, if the radial gap is larger, Δ = 0.03mm. At this time, although the coordination of the bearing can work normally, its service life is greatly shortened. Therefore, when determining the radial gap in the bearing radial, it should be ensured that the bearings should be as small as possible under the premise of normal work. After the bearing assembly, first of all, it should be made well according to the running -in operation specifications, and then gradually loaded acceleration to make the coordinate surface of the shaft and bearings flattened, and finally put it in normal operation. Otherwise, even if the gap is not small, it is put in normal operation because it does not run out after assembly, which causes the bearing to overheat or even burn tiles. In this regard, sliding bearing radial gaps should be controlled at 0.10mm to 0.15mm.

         Sliding bearing radial gaps have a great impact on bearing overheating and life. Therefore, for radial gaps, we must strictly control them within a reasonable range. When determining the radial gap in the bearing, it is necessary to comprehensively consider the factors that affect the radial gap. In addition to considering the diameter, speed, load and machine accuracy of the shaft, the following points should also be considered:

         A>, bearing material. The bearing materials are different, the expansion coefficients are different, and the gaps are different.

         B>, shaft and bearings roughness.

        C>, the geometric shape and position error of the neck and bearing (that is, the roundness, cylindricality, coaxiality, etc.).

         D>, the work temperature of the bearings.

         F>, the sudden changes in starting work conditions.