Reasons for high temperature of water pump bearings

The roller bearing manufacturer tells you that the main reasons for the excessive temperature rise of the automobile water pump bearing are: (At this time, just pay attention to observe and find out the cause in time, and it is not difficult to deal with it)

　　 (1) The water pump shaft is bent or out of concentricity, which will cause the water pump to vibrate and cause heating or wear of the bearing.

　　 (2) Due to the increase of axial thrust (for example, when the balance plate and balance ring in the water pump are seriously damaged), the axial load on the bearing is increased, causing the bearing to heat up or even be damaged.

　　 (3) The amount of lubricating oil (grease) in the bearing is insufficient or too much, the quality is poor, and there are debris, iron filings and other debris; sliding bearings sometimes cause the bearing to heat up because the oil ring does not rotate and the oil does not come in.

　　 (4) The bearing clearance does not meet the requirements. If the fit between the inner ring of the bearing and the water pump shaft, the outer ring of the bearing and the bearing body is too loose or too tight, it can cause the bearing to heat up. (Too tight fit will make the bearing inflexible; too loose fit will make the inner ring of the bearing rotate or the entire bearing will rotate in the bearing body).

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

 (6) Vibration occurs when the water pump is running under non-design point conditions, which will also cause the water pump bearing to heat up.

(7) The bearing has been damaged (including the quality problem of the purchased bearing itself), which is often the common cause of bearing heating, such as the damage of the rolling bearing cage, the steel ball crushing the inner ring or the outer ring fracture; the alloy layer of the sliding bearing peels off, Drop blocks and so on. In this case, the sound at the bearing is abnormal and the noise is loud, so the bearing should be disassembled for inspection and replaced in time.

What should be paid attention to for newly used water pump bearings? The lubricating oil (grease) of the water pump needs to be replaced after 100 hours of operation, and it needs to be replaced every 500 hours after that. If the fluid bearing is lubricated with grease, the grease can be replaced after 1500h of operation. Note that the amount of oil should not be too much or too little, so as not to cause the bearing to heat up, and it is more appropriate to control the amount of oil to be controlled at 1/2 to 2/3 of the volume of the bearing chamber.

If lubricating oil is used to lubricate the bearing, the amount of oil reaches the specified position. Pay attention to the container containing lubricating oil or grease to be clean and well sealed, and be careful not to have iron filings, dust and other debris to avoid damage to the bearing.