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bushingA ring sleeve that serves as a lining.
Function: In moving parts, long-term friction causes wear and tear on the parts. When the gap between the shaft and the hole is worn to a certain extent, the parts must be replaced. Therefore, designers choose materials with lower hardness and better wear resistance as shaft sleeves or bushings during design, which can reduce wear on the shaft and seat. When the shaft sleeve or bushing is worn to a certain extent, it can be replaced, which can save the cost of replacing the shaft or seat, Generally speaking, the sleeve and seat are fitted with interference fit, while the shaft is fitted with clearance fit, because wear cannot be avoided in any case and can only extend the service life. However, shaft parts are relatively easy to machine; There are also some new designers who do not like this design, thinking that it increases costs during manufacturing. However, after a period of use, this method still needs to be used for maintenance. However, the modification can easily lead to a decrease in equipment accuracy. The reason is simple: secondary processing cannot ensure the supplementation of the center position of the seat hole, and the shaft sleeve has a lower speed in some cases, Places with high radial loads and high clearance requirements (such as camshafts) are used to replace rolling bearings (in fact, the shaft sleeve is also a type of sliding bearing). The material requirements are low hardness and wear resistance. The inner hole of the shaft sleeve is ground and scraped to achieve high fitting accuracy. There must be a lubricating oil groove on the inner wall, and lubrication of the shaft sleeve is very important. If dry grinding occurs, the shaft and shaft sleeve will soon be scrapped. It is recommended to scrape the inner hole wall of the shaft sleeve during installation, This can leave many small pits and enhance the lubrication of the lining and shaft sleeve. Different models are selected according to different industrial and mining conditions. The main conditions are: pressure, velocity, pressure velocity product, lubrication state, and load properties. Wrap the valve stem, it is worn out and can be easily replaced. If the bushing is not used, the parts will be replaced after wear. So the replacement is to replace the lining (during the design, the hardness of the lining is reduced, making it a wear-resistant part in the friction pair). Due to its convenient processing, low replacement cost, and ease of replacement. Of course, there are also guiding effects, which are secondary.
The shaft sleeve is used as a replacement for rolling bearings in places with low rotational speed, high radial load, and high clearance requirements (such as camshafts). In fact, the shaft sleeve is also a type of sliding bearing, and the material requires low hardness and wear resistance. The inner hole of the shaft sleeve is ground and scraped to achieve high fitting accuracy. There must be a lubricating oil groove on the inner wall, and lubrication of the shaft sleeve is very important. If it is dry ground, the shaft and shaft sleeve will soon be scrapped, It is recommended to scrape the inner hole wall of the shaft sleeve during installation, which can leave many small pits and enhance lubrication
Bushings and shaft sleeves are selected according to different industrial and mining conditions. The main conditions are: pressure, velocity, pressure velocity product, lubrication state, and load properties. The requirements for rotational motion and axial sliding are different, and there is also a significant difference in the performance of lubricating oil. The speed and pressure basically determine the lifespan of the shaft sleeve.
Bushing is generally divided into two types. One is determined for easy disassembly and assembly. Another type is used as sliding bearings. The shaft sleeve is generally used to prevent axial displacement
Avoid stress concentration areas (such as large differences in thickness) and prevent shaft breakage on vertical axial flow pumps, oblique flow pumps, and deep well pumps. The shaft sleeve and rubber bearings or Sailon bearings form a "lubrication pair". However, in some horizontal pumps, such as split double suction pumps, the shaft sleeve plays an axial adjustment role, while the packing shaft sleeve and packing work together to seal. The main wear resistance is protective, and the main wear resistance is protective Shaft sleeveGenerally, it serves as a sliding bearing. In order to save materials, the wall thickness of the shaft sleeve is designed according to the axial load required by the bearing. Generally, cast copper and bearing alloy materials are selected. There is a distinction between open and non open shaft sleeves, depending on the structural requirements. Generally, the shaft sleeve cannot withstand axial loads or can only withstand smaller axial loads. Or add thrust bearings. The axis is generally circular.
Bushing: Bushing generally serves as a lining. Shafts can be of various shapes, and the same applies to bushings. Bushing can be used for corrosion prevention, elimination of assembly gaps, and so on - the same applies to the materials used.
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