Automotive water pump bearings need to have strong anti-friction ability

Regarding the selection of the original radial clearance of the water pump shaft bearing, not only the reduction in the clearance caused by the interference fit of the outer ring in the bearing housing hole, but also the thermal expansion of the relevant components due to the increase in temperature should be considered. This reduces the amount of play.

  The water pump casing can be divided into two types: iron casing and aluminum casing. The fit between the shaft bearing and the water pump casing is generally an interference fit. In addition, the temperature difference between the casing of the water pump shaft bearing and the shaft is relatively large. Estimate the minimum clearance required.

 How to identify the fault of the car's water pump shaft bearing? It can be understood from three aspects.

  On the one hand, it can be distinguished from the sound. This requires experience. After the number of exercises is increased, the bearing sound and non-bearing sound can be distinguished.

  On the other hand, the water pump bearing can be identified by temperature (when the working state is relatively stable), and a continuous record of the temperature is performed. When the temperature increases and changes irregularly, it may malfunction.

  The condition of the lubricant can also be used to identify the failure of the water pump bearing, the degree of turbidity of the lubricant, the metal powder, etc. to identify the condition of the bearing.

The material of the shaft and outer ring of the car water pump shaft bearing is made of carburized steel or high chromium bearing steel (the hardness is usually 462WB1226106). The conventional shaft bearing is made of high carbon chromium bearing steel. What is the hardness of each part of the bearing?

   The hardness of the steel balls and rollers of the automobile water pump bearing is WB1230106, the hardness of the outer ring of the water pump bearing is generally WB1230106, and the water pump bearing adopts carburized bearing steel to make the raceway hardness of the outer ring of the shaft WB1230106.

   Water pump bearings used in the automotive industry need to have strong anti-friction ability due to their special use. The water pump bearing itself is a simple double-support bearing, but in order to adapt to different models, there are more models of water pump bearings.

   With the changes in automobile engines, the performance requirements for automobile water pump bearings have also increased. For example, F1 carbon steel is used as the cage for the material, and stainless bearing steel is used as the bearing. There are also higher requirements for bearing capacity and heat resistance.