Pay attention to the work of automobile water pump shaft bearing

1.Prevention of assembly foreign matter?

When the imported bearing is installed on the rotor for dynamic balancing, it is easy to enter the iron filings generated during the dynamic balancing into the imported bearing? Therefore, it is best to perform dynamic balancing before installing the imported bearing. For the convenience of assembly, some manufacturers apply some oil or grease to the imported bearing chamber for lubrication effect during assembly. However, it is often difficult for the operator to control the amount. If more oil or grease accumulates in the imported bearing chamber? In the water pump shaft When the imported bearing rotates, it is easy to enter the inside of the INA imported bearing along the shaft. It is best not to apply oil or grease to the imported bearing room. If it must be applied, it must be controlled not to accumulate in the imported bearing room.

2.Prevention of paint rust?

The characteristic of lacquer rust is that it mostly occurs in the sealed motor? The motor sounds very good during assembly? But after some time in the warehouse? The abnormal noise of the motor becomes very large. Remove the water pump shaft and the imported bearing. There is serious rust. . In the past, many manufacturers would think it was the problem of imported bearings? After our continuous publicity? Now the motor factory has realized that it is mainly the problem of insulating paint. This problem is mainly because the acidic substance volatilized from the insulating paint forms corrosive substances under a certain temperature and humidity. After the imported bearing groove is corroded, the imported INA bearing is damaged. At present, the problem can only be to choose a good insulating paint and ventilate for a period of time after drying and then assemble.

3. How to choose and control the tolerance of shaft and imported bearing room?

The imported bearing of the water pump shaft should rotate flexibly without any sense of blocking after being pressed into the imported bearing. If the rotation is obviously not flexible? It means that the size of the shaft is too large? The tolerance should be lowered. If the water pump shaft and the imported bearing are pressed into the shaft and turned by hand, there is an obvious feeling of "sand"? It may be because the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, when controlling the tolerance of the shaft and the imported bearing room, the roundness must be controlled. At present, many domestic manufacturers only control the tolerance but not the roundness.

4. How to assemble imported bearings?

Because the imported bearing is a high-precision product, improper assembly of the water pump shaft and coupling can easily cause damage to the water pump shaft and the imported bearing channel and cause damage to the INA imported bearing. Imported bearings should have a special mold when assembling. They cannot be knocked at will. When pressing into the shaft, only the small circle can be forced? When the large circle is pressed, only the large circle can be forced. When assembling, it is required to use air pressure or hydraulic pressure. When pressing, the upper and lower touch should be outside the horizontal state. If there is an inclination, the imported bearing channel will be damaged due to the force. The imported bearing will cause noise.