Cylindrical roller bearing general used only to bear radial load, and the same size compared the deep groove ball bearings, has the big radial direction load capacity, limit rotational speed close to deep groove ball bearings, but with this kind of bearing the shaft, shell holes with the demand is higher, allow the processing with outer circle of inner axis tilt 2 deg; Axis is small two axis tilt as beyond limit, roller and ring groove contact situation will worsen, the serious influence bearing load capacity, reduce the service life of the bearings. So these bearings are under such need to install the axial load effect only in host components used at the same time other kinds of bearings to withstand the premise of axial load, ability can use.