Because the ntn bearing emits abnormal sounds and irregular sounds even if it is slightly peeled off, it can be distinguished by the sounder. The sounder is used to measure the size and sound quality of the angular contact ball bearings in operation. Check it to prevent it in advance.
If the oil hole can directly measure the bearing outer ring temperature, it is more suitable. In general, the temperature of the ntn bearing is generally estimated based on the temperature outside the bearing. If the lubrication and installation parts are suitable, the bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions. Usually, the temperature of the bearing rises slowly as the operation starts, and reaches a steady state after 1-2 hours. The normal temperature of an angular contact ball bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If necessary, use the thermal sensor to monitor the working temperature of the bearing at any time, and automatically alarm the household when the temperature exceeds the specified value or stop the burning shaft accident.
The assembly of the ntn bearing is the basic operation in the assembly and repair work of the fitter, and the adjustment and preloading of the clearance is an important part of the assembly work of the rolling bearing. Accurately grasping the process concept of clearance adjustment and pre-tightening, and correctly applying this process in assembly work is the guarantee of the quality of bearing assembly work.
The clearance of the ntn bearing refers to the maximum amount of movement of the other ferrule in the radial or axial direction when one ferrule is fixed, so the clearance is divided into radial clearance and axial clearance. When angular contact ball bearings are assembled, the clearance should not be too large or too small. If the clearance is too large, the number of rolling bodies that can bear the load at the same time is reduced, and the load of the single rolling element is increased, thereby reducing the rotation precision of the bearing and reducing the service life; if the clearance is too small, the frictional force is increased, and the generated heat is generated. Increased, increased wear and tear, can also reduce the service life of the bearing. Therefore, the bearings must be tightly controlled and adjusted during assembly.
The pre-tightening is that the bearing is assembled with an axial force to the inner ring or the outer ring to eliminate the bearing play and cause initial deformation of the rolling element in contact with the inner and outer rings. Preloading can improve the rigidity and rotation accuracy of the bearing under working conditions, and the bearing with large load and high rotation precision requires most of the work without clearance or even a small amount of interference. In this case, The bearings need to be pre-tensioned during assembly. Adjustment and preloading of the clearance are usually accomplished by appropriate axial relative displacement of the inner ring to the outer ring. It is not difficult to see from the above technical concept that the bearing capacity and rotation accuracy of the bearing can be improved by adjusting the clearance of the angular contact ball bearing to improve the service life of the bearing. At the same time, the friction of the ntn bearing is intensified, and the heat generation is increased, so good lubrication and heat dissipation must be ensured when adjusting the clearance or pre-tightening. If improperly adjusted or poorly lubricated, it will in turn increase bearing wear and reduce life. Correctly adjust and pre-tighten the bearing clearance, and pay attention to the following problems.
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