The axial fixation of the motor bearing is the key to ensure the normal operation of the motor. Poor axial fixation may lead to increased bearing wear, noise and vibration, and even bearing damage. Therefore, mastering the correct axial fixation skills is of great significance to ensure the stability and life of the motor. This paper will discuss the importance of axial fixation, skills and practice of the motor bearing axial fixation skills and practices.
The axial fixation of the motor bearing is to prevent the bearing from displacing in the axial direction. During the operation of the motor, the bearing will be affected by axial and radial forces. If the axial fixation is not firm, the bearing will produce displacement in the axial direction, which will lead to increased bearing wear, noise and vibration, and even lead to bearing damage. Therefore, it is very important to ensure the axial fixation of the motor bearings.
Use thrust bearings
A thrust bearing is a bearing specially designed to withstand axial forces. In the motor, the thrust bearing can be installed in the axial direction of the bearing seat to prevent the bearing from displacing in the axial direction. It should be noted that the installation direction of the thrust bearing should be consistent with the direction of the axial force.
Use axle shoulders and end caps
In the motor, the shaft shoulder and the end cap can be used to achieve the axial fixation of the bearing. The shoulder is a step on the shaft that provides support between the inner and outer rings of the bearing. The end cap is a cover fixed on the bearing seat to provide support on the outer ring of the bearing. By placing a gasket between the shaft shoulder and the end cap, the axial clearance of the bearing can be adjusted to ensure that the bearing is axially fixed.
Use spring washer
A spring washer is an elastic washer that provides an axial force between the bearing seat and the end cap to prevent the bearing from displacing in the axial direction. It should be noted that the spring washer’s elasticity should be moderate, too large will lead to too tight bearing, too small can not play a fixed role.
Taking a three-phase asynchronous motor as an example, this paper introduces how to use axle shoulder and end cap to realize axial fixation of bearings. The motor model is Y132S-4, with a power of 5.5kW and a speed of 1440r/min.
First, fix the bearing seat on the motor’s frame. Then, put the bearing inner ring into the bearing seat, and then put the bearing outer ring on the shaft shoulder. Then, the end cover is fixed on the bearing seat, and the end cover and the bearing seat are fastened together with bolts. Place an appropriate amount of gasket between the end cover and the bearing seat to adjust the axial clearance of the bearing. Finally, turn the shaft of the motor by hand to check whether the bearing rotates flexibly and whether there is abnormal noise or vibration.
It should be noted that when installing bearings, special tools should be used to evenly press the bearing inner ring into the bearing seat to avoid deformation caused by uneven force on the bearing inner ring. In addition, when installing the end cap, attention should be paid to the tightening sequence and strength of the bolts to avoid deformation or rupture of the end cap due to uneven force.
This paper introduces the axial fixing technique and practice of motor bearing. Axial fixation is to prevent the bearing from displacing in the axial direction, which is of great significance to ensure the stability and life of the motor. In practical applications, the axial fixation of bearings can be realized by using thrust bearings, axle shoulders and end caps, spring washers, etc. Select an appropriate axial fixing method according to the specific situation, and ensure that the installation is correct and the adjustment is reasonable. Through the study and application of correct axial fixing skills and practical cases, the service life of the motor can be effectively extended and the running stability of the motor can be improved.
