Usually the bearing and the shaft are used together, the bearing inner sleeve is installed together with the shaft, and the bearing coat is installed together with the bearing housing. If the inner sleeve rotates with the shaft, the inner sleeve and the shaft adopt a close fit, and the bearing coat and the bearing body adopt a clearance fit; On the contrary, if the bearing body and the bearing coat turn together, the bearing coat and the bearing body adopt a tight fit, while the bearing inner sleeve and the shaft adopt a clearance fit.

In the process of operation often occur lap fault, which requires analysis and treatment, otherwise it will cause accidents, resulting in greater losses.


1. Bearing running ring is a common fault, and the reasons for running ring are various.

1. The first is improper cooperation

We know that the running bearing will produce heat, and there is a temperature difference between the shaft and the inner sleeve, and between the jacket and the bearing body. These temperature differences will cause changes in the tightness of the bearing. If the inner sleeve size of the closely matched bearing is larger than the outer diameter of the shaft, with the extension of time, wear will occur, and the running circle is inevitable!

The temperature of the bearing body will also rise. Once the bearing body expands, the bearing clearance disappears, and the inner and outer sleeves of the bearing become one. With the shaft turning, then, the bearing coat rotates in the bearing body, and produces a lot of heat. This is the formation of temperature difference due to improper tightness caused by running laps.

2. Lap running caused by vibration
If the equipment vibration is larger, the bearing and bearing by the greater the east load, the shaft in operation is like being beaten, over time, the shaft will be beat extension, the journal becomes thin, which destroys the original with tightness, the formation of micro-movement, heating, running conditions, the journal will be fine, the bearing body hole will be friction.

3. Lubrication failure
Lubrication failure, friction generated more heat, bearing inner and outer sleeve, bearing body temperature difference is large, destroy the original fit size, bearing journal, bearing body wear.

4. Improper choice of lubricating oil or even more impurities
When large grease hardness or impurities, will cause bearing rolling body cavity effect, stop rolling element has its own spin, friction heat, it will also drive the coat on the choice of bearing body, wear, when the resistance is bigger, the resistance can overcome the friction of the bearing inner sleeve on the shaft, the shaft from the inner sleeve slip, slide, causing wear and tear.

5. Improper installation
Said improper installation mainly refers to such as bearing heating temperature is too high, bearing expansion, size can not be returned; The residual clearance of the free end bearing of the shaft is insufficient, resulting in friction heat generation on the side of the bearing; Bearing, shaft, bearing body cleaning is not clean, resulting in stuck; Splitting the bearing seat closing mouth flattens the bearing, resulting in local stuck bearing and other adverse conditions, these conditions will cause bearing heat, leading to bearing running.

6. Long-term vibration and percussion, will make the shaft fatigue peeling
Once the debris is discharged, it will inevitably cause loosening and cause the bearing to run.

7. Bearing failure
For bearings running for a long time, the raceway will produce point fatigue pitting corrosion, and the shed debris will produce weir effect. Once heated, and the temperature difference will occur, it will cause running laps.

2 the processing of bearing running rings
To sum up, the reasons for bearing running are various, so when there is a fault or accident, we must analyze the reasons, find out the root cause of the accident, and then take appropriate measures to deal with it according to the specific situation. The details are as follows:

1. proofing punching method
When the bearing runs the ring, the fine hole of the shaft is large, which can be avoided on the surface or in the bearing body, and some samples are punched evenly to make up for the size change in the raised part. This will temporarily solve the running problems

2. brush plating method
By electroplating, chromium metal is plated directly on the shaft or bearing body to restore the basic size.

3. Adhesive method
When the shaft is worn or the bearing body hole is worn, it will cause the bearing to run. At this time, appropriate metal adhesives can be selected and filled into the contact area gap, which can be solved after solidification. This is a reminder that the adhesive should only be used on tightly fitting contact surfaces. For example, bearing inner sleeve that rotates with the shaft, bearing jacket that rotates with the wheel.

4.welding turning method
The worn parts are filled in by welding long pieces of meat and then machined to size to restore function. However, this method should not be used in stress-sensitive parts because welding will change the mechanical properties of materials and produce stress concentration.

5.set method
Insert method is also commonly used method, that is, the first damage to avoid and associated with part of the material processing down, and then processing a sleeve inlaid on the shaft or bearing body, and then with the surface processing to the appropriate size. The method needs to pay attention to the strength of the sleeve, and the damage to the shaft and bearing body, and so on.

3 conclusion
The above is the common method of bearing recovery. In particular, the key is to analyze the causes of shaft, bearing and bearing body wear. These reasons must be eliminated.

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