What do you need to pay attention to when buying bearings: Some considerations when selecting bearings

Noise and vibration

The noise and vibration of the bearing itself are generally very low. But for small and medium motors, office machinery, household appliances, and meters that have special requirements for noise and smooth running, low-noise bearings are usually used.

Axial movement

The most common way to configure bearings is to install a set of axially positioned "same bearings" at one end of the shaft and install a set of axially movable "floating bearings" at the other end to prevent the shaft from expanding and contracting due to heat. A stuck phenomenon occurs. The frequently used "floating bearing" is a cylindrical roller bearing with no ribs on the inner ring or outer ring. At this time, the inner ring and the shaft or the outer ring and the housing hole can be fitted with an interference fit. Sometimes non-separable deep groove ball bearings or spherical roller bearings can be used as floating bearings, but when installing the inner ring and the shaft or outer ring and the housing hole, a clearance fit should be selected to ensure that the inner or outer ring has Enough freedom of axial movement.

Friction torque

The friction resistance of ball bearings is smaller than that of roller bearings. When a pure radial load is applied, the friction resistance of radial contact bearing is small; when a pure axial load is applied, the friction resistance of axial contact bearing is small; when the combined load is applied, the bearing is in contact Angular contact bearings whose angles are close to the load angle have the least frictional resistance. In instruments and machinery that require low friction torque, ball bearings or cylindrical roller bearings are more appropriate. At the same time, it is recommended to use drip lubrication, oil-air lubrication or other lubrication methods that are conducive to reducing friction.

Installation and removal

Bearings with cylindrical bores are used in machines that are frequently installed and disassembled. Separate angular contact ball bearings, tapered roller bearings, separable cylindrical roller bearings, needle bearings and thrust bearings should be preferred. The bearing with a conical inner hole can be installed on the journal, or on the cylindrical journal with the aid of an adapter sleeve or a withdrawal sleeve, which is very convenient for installation and disassembly.

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