Automobile water pump shaft bearing

Automobile water pump shaft bearings are key parts in automobile water pumps. Common automobile water pump bearings include deep groove ball bearings, cylindrical roller bearings, etc. The structure has a bearing with single and double-sided seals, and open bearings with additional seals. Wait.

In light-duty vehicles, commercial vehicles, and car water pumps, the water pump bearing adopts the unit structure of the water pump shaft-connected shaft, which is compact in structure and comes with seals and is easy to install. The outer ring is a double row integral type, and the inner ring is a water pump shaft. There are multiple combinations of double-row balls, single-row balls and needle rollers, single-row balls and cylindrical rollers.

The automobile water pump shaft bearing is a kind of bearing. The material of the holder is usually reinforced nylon 66, and the material of the sealing ring is usually nitrile rubber. When the request is higher, the fluorine rubber sealing ring can also be used.

After the water pump shaft bearing is pressed into the imported bearing, it should rotate flexibly without any sense of blocking. If there is obvious inflexible rotation, it indicates that the size of the shaft is too large and the tolerance needs to 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 shaft tolerance 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.

Automobile water pump bearing bearings are high-precision products. If improperly assembled, improper assembly of the water pump shaft can easily damage the water pump shaft and the imported bearing raceway and cause damage to the imported INA bearing. Imported bearings should have special molds when assembling them. They can’t be knocked at will. When they are pressed into the shaft, they can only receive a small circle of force, and when they press a large circle, they can only receive a large circle. When assembling, it is requested to use air pressure or hydraulic pressure. When pressing, the upper and lower touches should be outside the horizontal state. If there is a tilt, the imported bearing channel will be damaged due to the force, which will cause the imported bearing to produce noise. And the end of the connecting rod passing through the fixing plate is provided with squares, the fixed plate is equipped with a level detection device, the level detection device is a bubble-type spirit level, the connecting rod is fixed on the fixing plate through a nut Π, the limit step and the bearing seat mounting plate A flat washer is sleeved between the bearing. This kind of bearing has a simple structure, quick adjustment process and convenient operation. The fixed plate is parallel to the bearing seat mounting plate, which can precisely control the adjustment process of the sleeve and the bearing spindle front end of the bidirectional hydrostatic bearing grinding head. Bearing clearances that have been used today are limited in terms of manufacturability (manufacturability, availability, fillability), and bearing clearances, so significantly smaller values over the entire bearing length are almost impossible to complete. Liquid metal The increase in the rotational speed of the sliding bearing acts linearly on its load-bearing capacity.

The water pump bearing is a new type of structural bearing developed to meet the above-mentioned needs. It is essentially a double-supported bearing system with a simplified structure. The two supported bearings do not have inner rings. The raceways of the rolling elements are directly made on the shaft. The outer rings of the two supported bearings are made into a whole. Both sides are sealed with seals to form a bearing assembly. Under the same load capacity, its radial dimension is smaller than that of ordinary type bearings.

Water pump bearings have higher speeds, poor heat dissipation conditions, and higher requirements for grease leakage and waterproof performance. Therefore, the XXF water pump shaft bearing adopts a light radial contact rubber seal structure. Under normal circumstances, nitrile rubber seals are used. When the application requirements are high, fluororubber seals can also be used, but the corresponding price is much higher. The function of the sealing cover of the water pump bearing is to prevent contaminants, such as dust or cooling water vapor, and to prevent the overflow of lubricant. Lubricant is used as part of the sealing lip, and usually a small amount of grease will overflow the sealing cover. This amount should not exceed 0.2 grams. The performance of the sealing cap is determined by the material and the black machine of the lip. The following is a detailed introduction: Traditional single-lip design: 1. Use ordinary cars 2. Rubber sealing parts 3. Easy to install 4. Economical standard double-lip seal design: 1. Used for special needs 2. Internal sealing Lips improve the persistence of grease 3. Reinforced rubber material can better prevent refrigerant from entering the bearing 4. Better tightening and locking on the outer ring, reducing the possibility of the sealing cover falling off 5. In order to reduce torque and improve sealing Performance, using the most optimized sealing lip. Clearance The internal clearance of the rolling bearing in use greatly affects the performance of the bearing, including fatigue life, vibration, noise, temperature rise, and so on. Theoretically, when there is a slight negative clearance, the service life of the bearing may be extended.