The structure of bearings mainly includes the following parts:-JFU Japan Factory Union LTD

The structure of bearings mainly includes the following parts:

Nov 27,2025

Inner ring: installed on the shaft neck and rotates with the shaft. The types of inner rings include conical inner rings, double raceway inner rings, wide inner rings, and inner rings with blocking edges.
Outer ring: installed in the bearing seat hole and generally does not rotate. The types of outer rings include conical outer rings, double raceway conical outer rings, self-aligning outer rings, outer spherical outer rings, etc.
Rolling element: The core component of a rolling bearing, due to its presence, there is rolling friction between the surfaces in relative motion. The types of rolling elements include balls, cylindrical rollers, tapered rollers, needle rollers, etc.
Retainer: evenly separate the rolling elements to avoid friction and guide them to move inside the bearing. The main purposes of the cage include separating the rolling elements to reduce the frictional heat generated by the bearing, evenly separating the rolling elements to optimize load distribution, and guiding the rolling elements in the unloaded area of the bearing. The types of retainers include stamped metal retainers, machined metal retainers, polymer retainers, pillar type retainers, etc.
In addition, lubricants are also considered the fifth largest component of rolling bearings, mainly used for lubrication, cooling, cleaning, and other purposes.
In summary, the structure of a bearing is a complex and precise system, with various parts working together to ensure the normal operation and long-term stability of the bearing.

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