Water pump bearing

Automobile water pump shaft bearing is a kind of bearing. The cage material is usually reinforced nylon 66. The sealing ring material is usually NBR. When the requirement is higher, the fluorine rubber sealing ring can also be selected.

Conventional shaft bearing steel (including shaft, outer ring, steel ball roller) is high carbon chromium bearing steel (GCr15). Because the high quality bearing steel is smelted by vacuum deoxidation and electromagnetic stirring, the content of oxide is less, and it can bear large contact compressive stress and high variable tensile stress at the same time. After heat treatment, the raceway hardness of the shaft is 58-62hrc. The hardness of ring raceway is 60-64hrc, and that of steel ball and roller is 61-65hrc. When the shaft and outer ring are made of carburized bearing steel, the hardness of raceway is 60-64hrc. The cage is usually made of reinforced nylon 66, the sealing ring is usually made of NBR, and the fluorine rubber sealing ring can be used when the requirements are higher.

As the water pump shaft bearing works at high speed and high temperature, the lubrication conditions directly affect the service life of the shaft. Generally, the imported high-grade grease with high dropping point and good consistency is used, and the radial contact seal with large interference is also used for the sealing ring, so as to ensure that the bearing will not lose oil for a long time

Prevention of foreign matters in assembly

When the imported bearing is installed on the rotor for dynamic balancing, it is easy to put the iron scraps generated during dynamic balancing into the imported bearing? Therefore, it is best to do dynamic balance before installing the imported bearing. Are there some manufacturers for the convenience of assembly? When assembling, apply some oil or grease to the inlet bearing chamber for lubrication? But it is often difficult for operators to control the quantity well? If more oil or grease is accumulated in the inlet bearing chamber? When the water pump shaft is connected with the inlet bearing, it is easy to enter the ina inlet bearing along the shaft. It is better not to apply oil or grease to the imported bearing chamber. If it is necessary, it should be controlled and no accumulation is allowed in the imported bearing chamber.

Prevention of paint rust

Paint rust is characterized by frequent occurrence in sealed motors? The sound of the motor is very good when it is assembled? But after some time in the warehouse? The abnormal noise of the motor is very big, and the inlet bearing of the water pump shaft is seriously rusted. In the past, many manufacturers thought it was the problem of imported bearings? After our continuous publicity. The motor factory has realized that the main problem is the insulating paint. The main reason for this problem is that the acid substance volatilized from insulating paint forms corrosive substance under certain temperature and humidity? The corrosion of the inlet bearing leads to the damage of ina inlet bearing. The problem is to select good insulating paint and assemble after drying and ventilating for a period of time.

Selection and control of tolerance for shaft and inlet bearing chamber

The water pump shaft connected with the inlet bearing should rotate flexibly without blocking after being pressed into the inlet bearing. In case of obvious inflexible rotation? The size of the shaft is too large? The tolerance should be lowered. If the water pump shaft is connected with the inlet bearing, there is obvious "rustling" feeling when it is turned by hand after pressing into the shaft? It may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, when controlling the tolerance of shaft and imported bearing housing, we should also control the roundness. Many domestic manufacturers only control the tolerance, but not the roundness.

Assembly method of imported bearing

Because the imported bearing is a high-precision product, if the pump shaft coupling is not assembled properly, it is easy to cause damage to the inlet bearing channel of the pump shaft coupling, leading to the damage of ina imported bearing. The imported bearing should be equipped with a special mold during assembly, which can not be knocked at will. When pressing in the shaft, only a small ring can bear the force? When pressing the big circle, only the big circle can bear the force. Is pneumatic or hydraulic pressure required for assembly? When pressing, the upper and lower parts should be out of the horizontal state. If there is inclination, the inlet bearing channel will be damaged due to stress? And make the imported bearing produce the guiding sound.