What is an automobile water pump shaft bearing?

The automobile water pump shaft bearing is a bearing. The automobile water pump is mainly composed of a shell, a pulley, a shaft and bearing, a slip ring seal, an impeller, etc. The bearing has a decisive effect on the service life of the entire water pump, and it also determines the pump's service life. Main performance such as noise.

The automobile water pump shaft bearing is a type of bearing. The cage material is usually reinforced nylon 66, and the seal ring material is generally nitrile rubber. When the requirements are higher, fluorine rubber seals can also be used.

The cooling system of the car engine is an important part of the car. The stability and reliability of the system and the compactness of its structure. Not only directly affects the mechanical properties of the car, but also affects the overall appearance of the car. For this reason, automobile engine cooling systems produced by industrially developed countries generally use cooling water pump shaft bearings.

The role of the automobile water pump is to circulate the cooling water between the engine water jacket and the radiator to ensure that the engine works normally within a certain temperature range; the water pump is mainly composed of the shell, the pulley, the shaft and the bearing, the slip ring seal and the impeller The bearing has a decisive effect on the service life of the entire water pump, and also determines the main performance of the water pump such as noise.

Based on the structural characteristics of the shaft-connected bearing, the inner ring of the shaft as the bearing should have a contact fatigue life corresponding to the bearing. When the bearing is running, the surface of the raceway and the rolling element will form cracks and expand under the long-term action of the cyclic load, until the surface of the raceway or the rolling element is fatigued and peeled. Once such a situation occurs during the operation of the shaft-connected bearing, its vibration and noise will increase sharply, thereby making the whole machine unable to work. It can be seen that in order to improve the service life of the shaft-connected bearing, in addition to considering the wear resistance and fatigue strength required as a shaft, it must have a higher contact fatigue life.

The steel selected for conventional shaft bearings (including shafts, outer rings, steel ball rollers) is high carbon chromium bearing steel (GCr15). Because high-quality bearing steel is smelted through vacuum deoxidation, electromagnetic stirring, and less oxide content, it can withstand greater contact pressure stress while also withstanding greater high variable tensile stress. After heat treatment, the hardness of the shaft raceway It is 58-62HRC. The hardness of the ring raceway is 60-64HRC, and the hardness of the steel ball and roller is 61-65HRC. When the shaft and outer ring are made of carburized bearing steel, the raceway hardness is 60-64HRC. The material of the cage is usually reinforced nylon 66, and the material of the sealing ring is generally nitrile rubber. When the requirement is higher, the fluorine rubber sealing ring can also be selected.

Because the water pump shaft bearing works at high speed and high temperature, the lubrication conditions directly affect the operating life of the shaft and shaft. Usually, imported high-grade grease with higher dropping point and better consistency is used, and the sealing ring is usually used. The radial contact seal with large surplus ensures that the bearing does not lose oil for many years.