Tapered roller bearings are separable rolling bearings capable of withstanding combined loads. They feature a conical roller and raceway structure, with the roller in line contact with the raceway. These bearings boast a large load-bearing area and high rigidity, enabling them to simultaneously withstand significant radial loads and unidirectional axial loads. Moreover, by adjusting the bearing clearance, ideal rotational accuracy can be achieved, making them suitable for heavy loads, shocks, and conditions demanding high rigidity. Depending on their structure, tapered roller bearings can be divided into single-row, double-row, and four-row types. Single-row tapered roller bearings are typically installed in pairs to achieve bidirectional axial positioning, while double-row and four-row types are more commonly used in heavy equipment to withstand greater combined loads and overturning moments. This type of bearing offers a wide range of sizes and precision grades, is wear-resistant and pressure-resistant, and operates stably. It can effectively adapt to significant installation errors and changes in working conditions. Widely used in automotive wheels, differentials, transmissions, machine tool spindles, metallurgical rolling mills, mining machinery, construction machinery, reducers, and various heavy-duty transmission equipment, it is a commonly used key bearing for applications requiring combined loads, precise axial positioning, and high rigidity support.