Rolling bearings normally comprise bearing rings, rolling elements and a cage.
Rolling elements are arranged between inner and outer rings with a cage, which retains the rolling elements in correct relative position, so they do not touch one another. With this structure, a smooth rolling motion is realized during operation.
There are many types of bearings such as Deep Groove Ball Bearing, Angular Contact Ball Bearing, Cylindrical Roller Bearing, Spherical Roller Bearing, Tapered Roller Bearing, Thrust Ball Bearing, Needle Roller Bearing and etc.
Crane rope sheaves and running wheels which are operated at low or medium speed are generally equipped with full complement type cylindrical roller bearings because the operation of these machines involves heavy, impact loading. These bearings are divided into shielded and open types. The shielded types is often used with the outer ring rotation.
Ball bearing units consist of pre-lubricated sealed ball bearing and a housing which varies in shape. They are capable of aligning themselves efficiently using the spherical fitting surface between the bearing and housing, effectively preventing overloads due to misalignment. Koyo ball bearing units are highly accurate and feature excellent load resistance. They are completely sealed, and provided with a re-lubrication feature.