Tapered roller bearing refers to a radial thrust type rolling bearing with a tapered roller as the rolling element. There are two types: small cone angle and large cone angle. The small cone angle mainly bears combined radial and axial loads, mainly radial loads. It is often used in pairs and installed in reverse. The inner and outer races can be installed separately, and the radial and axial clearance can be adjusted during installation and use; The large cone angle mainly bears the combined axial and radial loads mainly composed of axial loads, and is generally not used separately to bear pure axial loads. It can be used as a pair configuration (with the same end installed relative to each other) to bear pure radial loads. Tapered roller bearings belong to separate type bearings, and both the inner and outer rings of the bearings have tapered raceways. This type of bearing is divided into different structural types based on the number of rows of installed rollers, such as single row, double row, and four row tapered roller bearings. Single row tapered roller bearings can withstand radial loads and axial loads in a single direction. When the bearing is subjected to radial load, an axial component will be generated, so another bearing that can withstand the opposite axial force is needed for balance.