I. Basic structural components of bearings

Basic components of bearings: inner ring, outer ring, rolling element, cage. Inner ring: often fits tightly with the shaft and rotates together. Outer ring: often fits with the bearing seat in transition, mainly for supporting. The inner and outer rings are made of bearing steel GCr15, and the hardness after heat treatment is HRC60~64. Rolling elements: With the help of cages, they are evenly arranged in the grooves of the inner and outer rings. Its shape, size, and number directly affect the load-bearing capacity and performance of the bearing. Cage: In addition to evenly separating the rolling elements, it also guides the rotation of the rolling elements and effectively improves 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 level is divided into ten levels from high to low according to dimensional tolerance, shape tolerance, gauge value and surface roughness: G (3, 5, 10, 16, 20, 24, 28, 40, 60, 100, 200). In addition, there is a dust cover (sealing ring) as an auxiliary structure of the bearing: to prevent foreign matter from entering the bearing. Grease: to lubricate, reduce vibration and noise, absorb friction heat, and increase the service life of the bearing.