Working principles of rolling imported bearing developed on the basis of sliding imported bearing is to replace sliding friction with rolling friction. It is generally composed of two rings, a group of rolling elements and a cage. It is a mechanical basic part with strong universality, high standardization and high degree of serialization. Due to the different working conditions of various machines, different requirements are put forward for the load capacity, structure and service performance of imported rolling bearings. Therefore, the imported rolling bearing needs a variety of structures. However, the basic structure is composed of inner ring, outer ring, rolling element and cage.
For centripetal inlet bearings, the inner ring usually fits tightly with the shaft and runs together with the shaft. The outer ring usually forms a transitional fit with the inlet bearing seat or mechanical shell hole to play a supporting role. However, in some cases, the outer ring also operates, the inner ring is fixed to play a supporting role, or both the inner ring and the outer ring operate at the same time.
For the thrust inlet bearing, the shaft ring which is tightly matched with the shaft and moves together is called the shaft ring, and the bearing ring which is transiently matched with the inlet bearing seat or mechanical shell hole and plays a supporting role is called the seat ring. Rolling elements (steel balls, rollers or needles) are usually evenly arranged between two rings in the imported bearing with the help of cage for rolling movement. Its shape, size and quantity directly affect the load capacity and service performance of the imported bearing.