In bearings, "Inner Race" (inner race), "Ball" (balls) and "Outer Race" (outer race) are three important components, which together form the basic structure of the bearing. Here’s what they mean:

Inner Race

The inner ring is an annular component of a bearing, usually located within the balls or rollers, that mates with the shaft. The inner ring rotates on the shaft through contact with the rolling elements, bearing and transmitting axial and radial loads.

Ball

Balls are the rolling elements in bearings. They are usually small spherical objects that roll between the inner and outer rings. Balls play a role in supporting and transmitting loads in bearings, reducing friction and sliding.

Outer Race (outer race)

The outer ring is another annular component of the bearing that is located on the outside of the balls or rollers. The outer ring cooperates with the inner ring and balls to provide external support and fixation of the bearing.

These three parts work together to form the basic structure of the bearing to support and transmit the load on the shaft, reduce friction, and enable the bearing to operate smoothly. Their materials and designs vary depending on the application and bearing type to meet specific load and operating environment requirements.