Causes of excessive pump bearing temperature

Bearing clearance does not meet the requirements. If the bearing inner ring and the water pump shaft, the bearing outer ring and the bearing body, the fit is too loose or too tight, can cause the bearing to generate heat. (Tighter fit will make the bearing rotation inflexible; too loose, will make the bearing inner ring rotation or the entire bearing in the bearing body rotation).

The main reasons why the temperature of the water pump bearing rises too high are: (At this time, as long as the observation is observed, it is not difficult to handle the cause in time.)

(1) If the water pump shaft is bent or misaligned, the water pump will vibrate, causing the bearing to generate heat or wear.

(2) As the axial thrust increases (for example, when the balance disc and the balance ring are seriously damaged in the pump), the axial load on the bearing is increased, causing the bearing to generate heat and even be damaged.

(3) The amount of lubricant (fat) in the bearing is insufficient or excessive, and the quality is poor. There is mud, sand, iron debris, etc.; The sliding bearing sometimes causes the bearing to generate heat because the oil ring does not rotate and it is not oiled.

(4) bearing clearance does not meet the requirements. If the bearing inner ring and the water pump shaft, the bearing outer ring and the bearing body, the fit is too loose or too tight, can cause the bearing to generate heat. (Tighter fit will make the bearing rotation inflexible; too loose, will make the bearing inner ring rotation or the entire bearing in the bearing body rotation).

(5) The static balance of the pump rotor is not good. The radial force of the pump rotor increases, bearing load increases, causing the bearing to heat up.

(6) The pump will generate vibration when operating at non-design conditions, which will also cause the pump bearing to heat up.

(7) The bearing has been damaged (including the purchase of the bearing itself quality problems), often the cause of bearing heating is more common, such as rolling bearing cage damage, steel ball crushed inner ring or outer ring fracture; sliding bearing alloy layer peeling, Lost blocks and so on. In this case, the bearings have abnormal sounds and noise, and they should be disassembled and inspected and replaced in time.

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