The shaft sleeve is integral and is the core component. It is necessary to manufacture the shaft sleeve and move relative to the shaft, while some of the bearing bushes are divided into pieces and rotate relative to the shaft.

　　 Shaft sleeve refers to the sleeve on the propeller shaft or stern shaft. The bearing (called "shaft receiver" in Japanese) is a component that fixes and reduces the friction coefficient of the load during the mechanical transmission process.

　　The similarity between the bushing and the bearing is that both bear the load of the shaft.

　　The difference between the two is that the shaft sleeve is an integral structure, and the shaft and the shaft sleeve move relative to each other when rotating; while the bearing is a split type, the inner and outer rings of the bearing itself move relative to each other when rotating. But in essence, the sleeve is actually a kind of sliding bearing.

Case 1: Shaft machining has a characteristic, the middle diameter is large, and it is continuously reduced to the two ends or one end. Because only in this way can the parts be put on one by one. However, in some cases, a larger diameter size has to be used on a certain step, and then a bushing can be used. This satisfies the use requirements and also meets the assembly requirements of the shaft.

Use bushing case 2: A certain step of the shaft needs to process features with more complex shapes, such as spiral oil grooves and so on. At this time, processing complex-shaped features on the shaft sleeve first and then assembling them on the shaft can greatly simplify the difficulty of shaft processing and reduce costs.