In summary, the angle of contact in angular contact ball bearings is a fundamental design feature that enables the bearing to support combined radial and axial loads, accommodate high-speed operation, and provide high precision and rigidity in various industrial applications.

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.

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