Bearing Structure

Bearings are primarily classified into rolling bearings and plain bearings. Rolling bearings utilize steel balls or rollers to reduce friction, resulting in a coefficient of friction as low as 0.001-0.005, making them suitable for high-speed rotation. Examples include deep groove ball bearings (maximum speed 10,000 rpm) and tapered roller bearings (contact angle 10°-30°). Plain bearings rely on a lubricating film, resulting in a coefficient of friction of approximately 0.01-0.1, making them suitable for heavy-load, low-speed applications, such as marine engines. Deep groove ball bearings feature continuous grooves in the inner and outer rings, with the balls evenly distributed within a cage. They can achieve a dynamic load rating of up to 14 kN (e.g., 6205 bearings), and a service life formula of L10 = (C/P)^3. When selecting a bearing, consider the load direction, speed (angular contact bearings are suitable for speeds above 20,000 rpm), and environmental conditions (corrosive environments require stainless steel bearings).