Rolling bearings developed on the basis of sliding bearings, whose working principle is to replace sliding friction with rolling friction, are generally composed of two rings, a set of rolling elements and a cage, which are highly versatile, standardized and serialized. High mechanical base pieces. Due to the different working conditions of various machines, various requirements are put forward for rolling bearings in terms of load capacity, structure and performance. For this reason, rolling bearings require various structures. However, the most basic structure is composed of inner ring, outer ring, rolling elements and cage.
The functions of various parts in the bearing are as follows: for radial bearings, the inner ring usually fits tightly with the shaft and runs together with the shaft, and the outer ring usually forms a transition fit with the bearing seat or the hole of the mechanical housing to play a supporting role. However, in some occasions, the outer ring is also running, and the inner ring is fixed to act as a support, or both the inner ring and the outer ring are running at the same time. For thrust bearings, it is called the shaft ring that fits tightly with the shaft and moves together, and it is called the seat ring that is in transition fit with the bearing seat or the hole of the mechanical housing and plays a supporting role. Rolling elements (steel balls, rollers or needle rollers) are usually evenly arranged between two rings by means of cages in the bearing for rolling motion. Its shape, size and quantity directly affect the load capacity and performance of the bearing. In addition to separating the rolling elements evenly, the cage can also play a role in guiding the rotation of the rolling elements and improving the internal lubrication performance of the bearing.
