Linear contact exists between the roller of the cylindrical roller bearing and the tray with big radical load capacity. So it is suitable for high speed rotating from the view of it structure. This kind of bearings include all types of bearing,rollers guided by the inner or outer rings. The cylindrical roller bearings of various structures are divided as per the different retaining edges.NU type cylindrical roller bearings have two retaining edges on the outer ring with non-retained inner ring.N type cylindrical roller bearings have two retained inner rings with non-retained outer ring.Both NU and N types cylindrical roller bearings are shifting bearings with separable inner and outer rings for easy dismounting.NJ type bearings have double retained outer rings with single retained inner ring.NF type bearings have double retained inner rings with single retained outer rings. They can bear the single directional axle force.NUP type cylindrical roller bearing is used as fixed bearing which can bear the alternative directional axial force.Bearings of this type have double retained outer ring with one retaining ring.