In summary, the key difference between tapered roller bearings and ball bearings lies in their design and load-carrying capabilities. Tapered roller bearings are designed to support both radial and axial loads, while ball bearings are primarily intended for radial load support. Each type of bearing is tailored to meet specific operational requirements and environmental conditions in diverse industrial applications.

   - Cylindrical Roller Bearings: Cylindrical roller bearings are used in applications where high radial load-carrying capacity, rigidity, and precision are essential, such as in machine tool spindles, electric motors, and industrial equipment.

In summary, main bearings are primarily responsible for supporting the rotational motion of the crankshaft and withstanding radial loads, while thrust bearings are designed to counteract axial forces and maintain the axial position of the crankshaft. Both types of bearings play critical roles in ensuring the smooth and reliable operation of engines and machinery.

   - Angular contact bearings are suitable for applications where precise positioning, controlled motion, and the ability to handle dynamic or oscillating loads are essential.