The type of bearings is mainly used to bear radial load, but can withstand a certain amount of axial load in either direction. When in a certain range, increasing the radial bearings when the oil gap, such bearings with angular contact ball bearings nature can bear large axial load. Deep groove ball bearings installed in the shaft after the shaft or housing can limit the axial displacement within the bearing axis. Meanwhile, when the shell hole and shaft (or the outer ring of the inner ring) relatively tilted (not more than 8-16, determined according to clearance) can still work. Since there are tilted, they are bound to reduce bearing life.