The cylindrical roller bearing has a large radial load capacity. As viewed from its structrue, it is also suitable for the medium and high speed rotations, It has more structural types,and can mainly divided into the following categories:(1) Having the inner ring and the outer ring,and having the cage structure; (2)The inner ring with the single side or the double sides; (3)The inner ring with the single side and a flat shield ring;(4)Without the inner ring,directly taking the surface of axis as the rolling surface;(5)Without the cage,the said structure has more numbers of the rolling elements and the large load capacity.These types of bearings have a widely applied scope,you can choose the different structures of them according to the concrete usable occasions.