What is the function of bearings?

To put it bluntly, the bearing plays a supporting role. If the transmission part (such as shaft) is directly matched with the hole, the transmission resistance is large, and it is not easy to replace the transmission part after wear. The bearing supports the transmission part through rolling contact between components, so the sliding resistance is small, the power consumption is low and the starting is easy.

The main function of bearing is to support the mechanical rotating body, reduce the friction coefficient during its movement and ensure its rotation accuracy. It can be understood that it is used to fix the shaft so that it can only rotate and control its axial and radial movements. If the shaft has no bearings, it won't work at all. Because the shaft can move in any direction, and it is required that the shaft can only rotate when working.

Bearings are widely used in automobiles: rear wheels, transmissions and parts of electrical equipment. Electricity: General Motors, household appliances. Instruments, internal combustion engines, construction machinery, railway vehicles, loading and unloading machinery, various industrial machinery. Machine tool spindle, agricultural machinery, high-frequency motor, gas turbine, centrifugal separator, front wheel of small car, differential pinion shaft.

Oil pumps, Roots blowers, air compressors, various transmissions, fuel injection pumps, printing machinery, motors, generators, internal combustion engines, gas turbines, machine tool spindles, reducers, loading and unloading machinery, and various industrial machinery. Bearings are used almost as long as they are rotating.

Extended data:

Features of bearings:

I. Contact fatigue strength

Under the action of periodic load, the contact surface of bearing is easy to be exhausted and damaged, that is, cracks and peeling appear, which is an important failure situation of bearing. Therefore, in order to improve the service life of bearings, bearing steel must have high contact fatigue strength.

Second, wear resistance.

In the process of bearing work, not only rolling friction but also sliding friction occurs between the ring, roller and maintenance frame, which keeps the bearing parts in a state of wear. In order to increase the wear of bearing parts, maintain the stability of bearing accuracy and prolong the service life, bearing steel should have good wear resistance.

Third, hardness.

Hardness is one of the important qualities of bearing quality, which has an indirect influence on contact fatigue strength, wear resistance and elastic limit. The hardness of bearing steel should reach HRC6 1~65 under working conditions, so that the bearing can obtain high contact fatigue strength and wear resistance.

Four. rust resistance

In order to prevent bearing parts and finished products from being corroded and rusted during processing, storage and use, bearing steel is required to have good antirust performance.

Processing performance of verbs (abbreviation of verb)

Bearing parts have to go through many cold and hot processes during consumption. In order to meet the requirements of small batch, high efficiency and high quality, bearing steel should have good working performance. Such as cold and hot formability, machinability, hardenability, etc.

In addition to the above basic requirements, bearing steel should also meet the requirements of proper chemical composition, general external structure, less nonmetallic impurities, appearance defects conforming to specifications, and decarburization layer on the surface not exceeding the specified concentration.

References:

Baidu encyclopedia-bearings