Adjustment of axial clearance and radial clearance of the slow-speed motor bearing
With the development of industrialization, the use of reduction motors in enterprises is becoming increasingly widespread. The adjustment of bearing clearance in reduction motors is key to whether the reducer can operate continuously and stably. Below, we will discuss the adjustment of axial and radial clearances of bearings.
Release time:
2022-04-08 18:01
www.gdmotor.cn
1,Reduction MotorAdjustment of Axial Clearance of Bearings
The inner ring of the bearing is positioned by the shaft shoulder, and the outer ring is preloaded by the bearing caps on both sides. The axial clearance of the bearing is adjusted by the preload force of the bearing caps on both sides. Considering that the clearance decreases due to heating of the bearing, necessary clearance should be reserved for the axial direction of the bearing. There are no corresponding standards for the axial clearance of bearings in the country.
In practical operations, the axial clearance is less affected by factors such as interference fit and load operation, so during installation, the original clearance of the bearing is usually used as the standard for adjustment.
In the case where the reduction motor is not covered, the shaft is assembled and installed in place, and the bolts of the bearing caps on both sides are tightened. Then, necessary pressure is applied axially at one end of the shaft.
The magnitude of this axial force can be referenced from the axial force that the shaft experiences during operation. Next, use a feeler gauge to measure gap 1 and gap 2. After measuring, calculate the sum of gap 1 and gap 2, and compare it with the original clearance measured for the bearing to ensure that the difference is within ±40μm. If the requirement cannot be met, adjustments can be made by increasing the thickness of the shims until the requirement is satisfied.
2,Reduction MotorAdjustment of Radial Clearance of Bearings
The radial clearance of the bearing plays a very important role in the stable operation of the bearing. There are corresponding standards for the radial clearance of bearings in GB/T4604-2006, so in specific applications, one can simply refer to the table to know the upper and lower limits of the radial clearance of the bearing.
The specific adjustment method: For convenience in measurement, the bearing caps on both sides should be removed before adjustment, and the bearing should be installed in the bearing seat. After covering the upper cover, use a torque wrench to evenly tighten the four fastening bolts on both sides of the bearing. The preload force of the bolts can refer to the corresponding provisions of the execution standard. After tightening, use a feeler gauge to measure, and compare the measured value with the standard value from the table.
For the reduction motor bearing model 23232CC/W33, according to GB/T4604-2006, the maximum radial clearance of this bearing is 110μm, and the minimum is 75μm.
Adjust the bearing clearance based on the comparison results. If the adjustment value is less than the minimum value, it indicates that the installation clearance of the bearing is too small, and the clearance should be increased. Copper shims can be placed at the bolt holes on the upper and lower mating surfaces of the bearing box for adjustment. If the adjustment value is greater than the maximum value, it indicates that the installation clearance of the bearing is too large, and copper shims can be placed at the mating surface between the bearing box and the outer ring of the bearing for adjustment, taking care not to block the oil holes of the bearing when placing the copper shims.
The above methods usually require multiple adjustments to bring the radial clearance of the bearing within the standard range. After the clearance adjustment meets the standard, reinstallation is performed.
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