What are the important components of the automobile water pump shaft bearing?

The practical internal clearance of automobile water pump shaft bearing greatly affects the service life and performance of the bearing. When selecting the original radial clearance, it is necessary to consider the reduction in clearance caused by the interference fit between the outer ring of the bearing and the housing hole. , But also consider the reduction in clearance caused by the thermal expansion of the relevant components caused by the temperature rise, and the recommended amount of interference.

Water pump bearings are delicate mechanical parts, so be careful when installing them. When installing, use auxiliary tools to stop mechanical press-in. It is strictly forbidden to transmit pressure through rolling elements. At the same time, the bearing should be prevented from being damaged by external impact. The roundness of the water pump housing hole should be controlled within 10μm and the cylindrical degree within 20μm.

The water pump is composed of a water pump housing, shaft bearing, water seal, impeller, fan and transmission parts. Shaft bearing is an important part of water pump. Due to the high speed of the water pump, the speed of the ordinary water pump is up to 6000r/min, and the speed of the high-speed water pump is as high as 9000r/min. Therefore, the shaft bearing is required to have a higher load-bearing ability, so as to meet the pump's life expectancy at a certain speed. . The space position of the water pump is limited, the heat dissipation area is small, and the working conditions are bad. Therefore, the shaft bearing should be able to meet the requirements of maintaining normal operation under high temperature without reducing the bearing capacity of the bearing. The sealing of the bearing has certain difficulties, and its sealing reliability and durability will directly affect the operability of the water pump.

A double-supported shaft system with a simplified structure. The two supported bearings have no inner rings. The raceways of the rolling elements are directly made on the shaft. The outer rings of the two supported bearings are made into a whole. Both sides of the ring are sealed. The parts are sealed to form the assembly of the shaft sleeve. Under the same load capacity, its radial dimension is smaller than that of ordinary type bearings; under the same radial dimension condition, its load capacity is greater than that of ordinary type bearings. Because of its good rigidity, rotation, simple structure, and easy assembly and disassembly, many prosperous western countries such as the United States, Japan, Germany, etc. have adopted shaft bearings with this structure. At present, some automotive cooling water pump bearings in China have not adopted this advanced structure, but still use two deep groove ball bearings and shafts to form a shaft system. This type of structure has many links, complex assembly procedures, low efficiency, and poor rigidity. It is being replaced by advanced automotive water pump shaft bearings. Various types of automobile water pump shaft bearings have been widely used in domestic automobiles and imported models.

Automobile water pump shaft bearing is an important part of the water pump. Due to the high speed of the water pump, the speed of the ordinary water pump is up to 6000r/min, and the speed of the high-speed water pump is as high as 9000r/min. Therefore, the shaft bearing is required to have a higher load-bearing ability, so as to meet the requirements of the life of the pump at a certain speed. The space position of the water pump is limited, the heat dissipation area is small, and the working conditions are bad. Therefore, the automobile axle bearing should be able to meet the requirements of maintaining normal operation under high temperature, and at the same time, the bearing can be sealed with certain difficulties and the seal is firm. Both performance and durability will directly affect the operability of the pump. In short, the bearing capacity, working clearance and sealing performance of the shaft bearing are the three important performance indicators that affect the performance of the pump. Automotive water pump bearings are a new type of structural bearing developed to meet the above-mentioned needs. It is essentially a double-supported shaft system with a simplified structure. The two supported bearings have no inner rings. The raceways of the rolling elements are directly made on the shaft. The outer rings of the two supported bearings are made into a whole. The two sides are sealed with seals to form the assembly of the shaft sleeve. Under the same load capacity, its radial dimension is smaller than that of ordinary type bearings; under the same radial dimension condition, its load capacity is greater than that of ordinary type bearings.