The relationship between the life of automobile water pump shaft bearing and its load

For general and conventional automobile water pump shaft bearings, the material selected is steel, including steel ball rollers, outer rings, shafts and other materials are all high-carbon chromium bearing steel (GCr15). The excellent* bearing steel is vacuum deoxidized, electromagnetic stirring, and the oxide content is relatively small. Therefore, it can withstand large contact compressive stress while also withstanding large high variable tensile stress. After the bearing steel is heat-treated, the raceway hardness of the shaft is generally 58-62HRC. The hardness of the steel ball and roller is 61-65HRC, and the hardness of the ring raceway is 60-64HRC.

   When the outer ring of the car water pump shaft bearing is made of carburized bearing steel, the hardness of its raceway is 60-64HRC.

The life of the bearing of the automobile water pump shaft is closely related to the load, and the size of the load is related to the unbalanced amount of the rotating component.

Through the test of WR3258152 automobile water pump shaft bearing, the influence of the unbalance of the fan and pulley eccentricity on the load and life of automobile water pump shaft bearing is studied. It is calculated that the eccentricity and unbalance of the pulley and the fan will make the radial load of the rolling elements on both sides of the automobile water pump shaft and the bearing fluctuate greatly, and the service life will be reduced accordingly.

Disassembly and assembly of the water pump bearing drag force needs to continue to a certain extent, for example, when installing the bearing, the screw pump needs to stop applying force when the bearing is installed in the correct position to ensure that the end face of the gasket abuts against the end face of the seat hole or the shoulder of the shaft. , Pay attention not to squeeze too tightly or not to fit in place.

   The resultant force of the disassembly and assembly of the automobile water pump shaft bearing should pass through the axis of the oil-free bearing as far as possible. For the plastic pump, the force point must be uniform, stable and symmetric, and the force must be applied through a spherical surface or parallel to the axis. Avoid applying force through the rolling elements, and the force should be uniform and stable, and there should be no impact.