In the moving parts, the wear of the parts is caused by long-term friction. When the gap between the shaft and the holes is worn to a certain extent, the parts must be replaced, so the designer has a lower hardness and better wear resistance at the time of design. The material is a shaft sleeve or bushing, which can reduce the wear of the shaft and the seat. When the bushing is worn to a certain extent for replacement, the cost of replacing the shaft or seat can be saved. Generally, the bushing and the seat are generally used. The interference fit is used, and the shaft is matched with the shaft, because the wear can not be avoided anyway, only the life is extended, and the shaft parts are relatively easy to process; some new designers do not like this design, think this increases the cost during manufacturing. However, after a period of use, the repair is still carried out in this way, but the modification is likely to cause the accuracy of the equipment to decrease. The reason is very simple. The secondary processing cannot guarantee the position of the center of the hole. In addition, the bushings are used to replace some of the lower speeds, higher radial loads and higher clearance requirements (such as camshafts). Dynamic bearing (in fact, the bushing is also a kind of sliding bearing), the material requires low hardness and wear resistance. The inner hole of the bushing is ground and scraped, which can achieve high matching precision. The oil groove of the lubricating oil must be on the inner wall. Lubrication is very important. If dry grinding, the shaft and bushing will soon be scrapped. It is recommended to scrape the inner wall of the bushing during installation, so that many small pits can be left. The lubrication bushing and bushing are strengthened according to different industrial and mining. Different models are used for the conditions. The most important conditions are: Pressure, speed, pressure velocity product, lubrication state, and load properties. Bushing quick and easy automation selection is included.
Wrap the stem and wear it out for easy replacement. If the bushing is not used, the parts are replaced after wear. Therefore, the replacement is to replace the bushing (the design is to reduce the hardness of the bushing so that it becomes a bearing member in the friction pair). Because of its convenient processing, the replacement cost is low, and it is easy to change. Of course, there are guiding effects, etc., which is second.