1.Bearing temperature is too high: When the mechanism is running, the part where the bearing is installed is allowed to have a certain temperature. When touching the housing of the mechanism with your hands, it is normal to not feel hot, otherwise it indicates that the bearing temperature is too high. The reasons for the excessively high bearing temperature include: the quality of lubricating oil does not meet the requirements or deterioration, the viscosity of lubricating oil is too high; the mechanism assembly is too tight (insufficient clearance); the bearing assembly is too tight; the bearing race rotates on the shaft or in the housing; Large; the bearing cage or rolling elements are broken, etc.

2.Bearing noise: Rolling bearings are allowed to have a slight running noise during operation. If the noise is too loud or there is abnormal noise or impact, it indicates that the bearing is faulty.

The reason for rolling bearing noise: more complicated,

1）It is the wear of the mating surfaces of the inner and outer rings of the bearing. Due to this kind of wear, it destroys the matching relationship between the bearing and the housing, and the bearing and the shaft, causing the axis to deviate from the correct position, causing abnormal noise when the shaft is moving at high speed. When the bearing is fatigued, the metal on its surface will peel off, which will also increase the radial clearance of the bearing and produce abnormal noise.

2）Insufficient bearing lubrication, formation of dry friction, and NSK bearing breakage will all produce abnormal noise.

3）After the bearing is worn and loosened, the cage is loosened and damaged, which will also cause damage to the bearing with abnormal noise. When the rolling bearing is disassembled and inspected, the fault and the cause of the damage can be judged according to the damage of the bearing.