The composition of rolling bearing and the role of each part

Rolling bearings are composed of four parts: outer ring, inner ring, rolling body and cage. Its structure is shown in Figure 1-1 (see appendix). Usually, the outer ring of the rolling bearing is installed in the frame hole and fixed, the inner ring is installed on the shaft and rotates together with the shaft, and the rolling body rolls between the raceway of the inner and outer rings, forming rolling friction.

1. Outer ring: The outer ring usually forms a transition match with the bearing seat or the mechanical shell hole and plays a supporting role.

2. Inner ring: The inner ring is usually closely matched with the shaft and runs with the shaft.

3, rolling body: rolling body (steel ball, roller or needle roller) in the bearing usually with the help of cage evenly arranged between the two rings for rolling motion, its shape, size and number directly affect the bearing load capacity and performance.

4. Cage: cage can not only divide rolling body evenly, but also guide rolling body rotation and improve bearing internal lubrication performance. Cages can be divided into five types: wave cage, crown cage, E cage, solid cage and chrysanthemum cage.

5, dust cover and sealing ring: in addition to the four main components of rolling bearings, some bearings also need dust cover or sealing ring. The function of the dust cover is to prevent the outside dust from invading the bearing. Detachable dust-proof cover, commonly known as "live cover", non-detachable dust-proof cover, commonly known as "dead cover", "fixed cover", sealing ring function is not to let the external oil, water, medium into the bearing. Contact sealing ring, non-contact sealing ring.