Most bearings are used to support the rotating shaft in the machine, allowing relative movement between machine parts, and providing some type of position between them.
The bearing allows two interacting surfaces to roll, slide or slide against each other, rather than rub against each other by transferring the weight of the load to the rolling element, so as to make the equipment rotate.
1) Bearing advantages
The motion provided by bearings is usually smoother than that of bushings, and static friction is overcome by rolling rather than sliding. They tend to be manufactured more accurately, with smaller tolerances, more suitable than bushings, and less sloppy and clearance. In high-speed environment, the bearing also has significant advantages over the bushing.
2) Bearing defects
Compared with the cost of bushing, the cost is high (about six to ten times). A lot of maintenance is required, usually including operation with loud lubrication. Improperly installed or damaged bearings may cause damage to other parts if separated.
The bushing is a cylindrical component designed to support the load on the shaft, which operates through sliding motion between moving surfaces.
The bushing slides on the rod or shaft to provide extremely low friction movement, provide excellent shock absorption and work, and minimize energy use, noise and wear.
1) Bushing advantages
Although the bushing is technically a type of bearing, it is a single component designed to support the shaft. Bushings have advantages over bearings in assembly process, and the cost is often lower. Compared with most bearings, they tend to be self-lubricating and provide quieter operation.
2) Bushing defect
The bushing must overcome static friction before moving, that is, adhesion and sliding. Especially when the linear motion system is worn or not aligned correctly, it will cause the bushing to move in an uneven and uneven way. Bushings, especially cheap ones, tend to have wider tolerances so that they can be installed on smooth rods less accurately.
Selection of bearings and bushings
Speed and load
The bushing responds well to low speed and heavy load applications. The load and speed range of bearing application is wider
Running stability
The bushing is often "sticky and slippery", while the bearing runs more smoothly
Maintenance/lubrication
Dry food and textile industries tend to use bushings; Or maintenance-free series bearing
Operation noise
If quiet operation is the key factor, the bushing usually runs quietly; For bearings, silent bearings can be considered
budget
The cost of bushing is often six to ten times lower than that of bearing