Tapered roller bearings refer to radial thrust rolling bearings with tapered rollers as rolling elements. There are two kinds of small cone angle and large cone angle. The small cone angle mainly bears the combined radial and axial load based on the radial load. It is often used in double use, reverse installation, the inner and outer races can be installed separately, and the radial and axial clearance can be adjusted during installation and use; The large taper angle mainly bears the combined axial and radial load mainly based on the axial load. Generally, it is not used to bear pure axial load alone, but can be used to bear pure radial load when configured in pairs (the ends of the same name are installed relative to each other).