1, the bearing temperature is too high
When the host operation, the installation of the bearings to allow a certain degree of temperature, when stroking the host shell by hand, should not feel hot for normal, the contrary indicates that the bearing temperature is too high.
The high temperature of bearing is: lubricating oil quality does not meet the requirements or metamorphism, lubricating oil viscosity too high; the host assembly is tight (insufficient clearance): Bearing assembly is too tight; the bearing bracket is too large to rotate in the shaft or the shell, and the bearing cage or rolling body is fractured.
2, bearing noise
Rolling bearings allow a slight operating noise in the work, if the noise is too large or abnormal noise or impact sound slightly deng sound, the bearings are faulty.
The reason for the noise of rolling bearings is complicated, one is bearing inner and outer ring mating surface wear. The abrasion, which destroys the mating relationship between the bearing and the shell, the bearing and the shaft, causes the axis to deviate from the correct position, and the bearings operate at a different noise when the load is loaded. When the bearing fatigue, the surface metal peeling off, also make the bearing radial clearance increase in abnormal sound. In addition, the bearing lubrication is insufficient, the formation of dry friction, and bearing crushing, etc. will produce abnormal sound. Bearing wear loose, the cage loose damage, will also produce abnormal sound.