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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.

   - Taper Roller Bearings: Taper roller bearings are designed to support both radial and axial loads by utilizing tapered inner and outer ring raceways. They are capable of handling thrust (axial) and radial loads in a single direction and are commonly used in applications such as automotive wheel hubs, gearboxes, and heavy machinery.