When the mechanism is running, the part where the bearing is installed is allowed to have a certain temperature. When touching the shell of the mechanism by hand, it should be normal to feel no hot hand. Otherwise, it indicates that the bearing temperature is too high.

The bearing temperature is too high for the following reasons: the quality of lubricating oil does not meet the requirements or deterioration, and the viscosity of lubricating oil is too high;Mechanism assembly is too tight (lack of clearance);Bearing assembly is too tight;The bearing ring rotates on the shaft or in the shell;Excessive load;Bearing retainer or rolling body fracture, etc.

2. Bearing noise

The rolling bearing is allowed to have slight running noise in its work. If the noise is too large or there is abnormal noise or collision, it indicates that the bearing has a fault.

The reasons for the noise of rolling bearings are more complex. One of them is the wear of the inner and outer rings of bearings.Because of this wear and tear, the bearing and the shell, bearing and shaft coordination relationship is destroyed, resulting in the axis deviation from the correct position, in the shaft at high speed movement produces abnormal sound.When the bearing is tired, its surface metal spalling, will also make the radial clearance of the bearing increase and produce abnormal sound.In addition, insufficient bearing lubrication, the formation of dry friction, and bearing breakage will produce abnormal sound.Bearing wear loose, cage loose damage, will also produce abnormal sound.

3. Bearing wear

Rolling bearing wear is a common equipment problem in the use of the shaft, mainly caused by the metal characteristics of the shaft: although the metal hardness is high, but the yield is poor (can not be recovered after deformation), poor impact resistance, poor fatigue performance, so easy to cause adhesion wear, abrasive wear, fatigue wear, fretting wear.Most of the shaft wear is not easy to detect, only when the machine high temperature, large jump range, abnormal sound and other circumstances, will cause detection, but to people find, most of the rolling shaft has been worn, resulting in machine shutdown.