Bushing is a type of sliding bearing. It is designed to reduce friction and wear during shaft movement. The cost is cheaper than rolling bearings, but the frictional resistance is large, so it will only be used on some components. Most of the bushings are made of copper, but there are also plastic bushings. The shaft sleeve is mostly placed in the shaft and the supporting structure, and it is very close to the supporting structure, and only the shaft can rotate on the shaft sleeve. When assembling the shaft and the bushing, lubricant is added between the two to reduce the frictional force generated when they rotate.
The shaft collar is a simple, yet important, machine component found in many power transmission applications, most notably motors and gearboxes. The collars are used as mechanical stops, locating components, and bearing faces. The simple design lends itself to easy installation.