Basic bearing knowledge

The basic components of bearings: inner ring, outer ring, rolling elements, cage

Inner ring: fits closely with the shaft and rotates together.

Outer ring: It is a transitional fit with the bearing seat and mainly plays a supporting role.

The material of the inner and outer rings is bearing steel GCr15, and the hardness after heat treatment is HRC60~64.

Rolling elements: are evenly arranged in the grooves of the inner and outer rings with the help of cages. Their shape, size, and quantity directly affect the bearing's load-bearing capacity and performance.

Cage: In addition to evenly separating the rolling elements, it also serves to guide the rotation of the rolling elements and effectively improve the internal lubrication performance of the bearing.

Steel ball: The material is generally bearing steel GCr15, and the hardness after heat treatment is HRC61~66. The accuracy grade is divided into G (3, 5, 10, 16, 20, 24, 28, 40, 60, 100, 200) according to the dimensional tolerance, shape tolerance, gauge value and surface roughness from high to low. These are ten grades. .

In addition, there are auxiliary structures of bearings

Dust cover (sealing ring): prevent foreign matter from entering the bearing.

Grease: lubricates, reduces vibration and noise, absorbs friction heat, and increases the service life of bearings.