In the above, Dalan Motor Xiaobian has shared the definition and reasons of overheating of hydraulic motor bearings. This paper will continue to share the treatment methods for overheating of hydraulic motor bearings.
In the above, Dalan Motor Xiaobian has shared the definition and reasons of overheating of hydraulic motor bearings. This paper will continue to share the treatment methods for overheating of hydraulic motor bearings. The specific operations are as follows:
1. The working performance of the rolling bearing depends not only on the manufacturing precision of the bearing itself, but also on the dimensional accuracy, shape tolerance and surface roughness of the shaft and hole to be matched with it, the matching of the selection and the correct installation.
2. In a general horizontal oil pump motor, a well-assembled rolling bearing only bears radial stress, but if the inner ring of the bearing is too tightly fitted with the shaft, or the outer ring of the bearing and the end cap are too tight, that is, when the public surplus is too large, The assembly will cause the bearing clearance to become too small, sometimes even close to zero. This rotation is not flexible and will generate heat during operation.
3. If the inner ring of the bearing and the shaft are loosely fitted, or the outer ring of the bearing and the end cover are too loose, the inner ring of the bearing and the shaft, or the outer ring and the end cover of the bearing will rotate relative to each other, resulting in friction and heat generation. Overheating of the bearing.
4. In the standard, the bearing inner ring inner diameter tolerance band of the reference part is moved below the zero line. The tolerance between the tolerance band of the same shaft and the inner ring of the bearing is much tighter than the cooperation with the common reference hole. .
5. If the grease is added too much or too little, the bearing will heat up. Because there is too much grease, there will be a lot of friction between the rotating part of the bearing and the grease. When the grease is too little, the dry friction may occur. And fever. Therefore, the amount of grease must be adjusted to be approximately 1/2-2/3 of the volume of the bearing chamber.
6. Clean or replace the unsuitable or deteriorated grease with a suitable clean grease.
7. Large and medium-sized motors generally use ball bearings at the non-shaft end. The shaft end uses a roller bearing, and when the rotor is thermally expanded, it can be freely extended.
8. For small motors, ball bearings are used at both ends, and there should be a proper gap between the outer bearing cover and the outer ring of the bearing. Otherwise, the bearing may be heated due to excessive thermal elongation in the axial direction. When this happens, the front or rear bearing cover should be removed a little, or a thin paper pad should be placed between the bearing cap and the end cap to form a sufficient gap between the outer bearing cap and the outer ring of the bearing. Clearance.
9. If the end caps or bearing caps on both sides of the motor are not parallel or the nozzles are not tightly pressed, the balls will rotate out of the track and generate heat. The end caps or bearing caps on both sides must be re-flattened and tightened evenly with bolts.
10. Balls, rollers, inner and outer rings, and ball holders are severely worn or metal peeling. At this time, the bearings should be renewed.
11. Poor connection with the load machine. In this case, correct the connection should be corrected to avoid the bearing from being subjected to abnormal force.
12. The shaft has been bent. At this time, the bearing force is no longer a pure radial force, thus causing the bearing to heat up. Try to straighten the bent shaft or replace it with a new one.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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