1. Reduce friction There will definitely be friction between the rotating "shaft" and the rotating support part. Bearings are used between the rotating "shaft" and the rotating support part.
Bearings reduce friction, allowing for smoother rotation and reduced energy consumption. This is the biggest role of bearings.
2. Protect the rotating support part. The rotating "shaft" and the rotating supporting part will bear a large force. Bearings prevent the rotating support parts from being damaged by this force, keeping the rotating "axle" in the correct position. It is precisely because of these functions of bearings that we can use the machine repeatedly for a long time.
Bearing uses: automobile rear wheels, transmissions, and electrical device components. Electrical: General electric motors, household appliances. Instruments, internal combustion engines, construction machinery, railway vehicles, loading and unloading machinery, and various industrial machinery. Machine tool spindles, agricultural machinery, high-frequency motors, gas turbines, centrifugal separators, small car front wheels, differential pinion shafts.
