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The need for preload in deep groove ball bearings depends on the specific application and the desired operating conditions.
In some cases, preload may be necessary to reduce the internal clearance of the bearing and increase its stiffness and accuracy. This can be important in high-precision applications, such as machine tool spindles, where small amounts of deflection or play can result in significant errors or reduced performance.
However, in other applications, such as those with high speeds or high temperatures, preload may not be necessary or may even be detrimental to the performance of the bearing. Excessive preload can increase friction and heat generation, leading to premature wear and failure.
In summary, whether or not deep groove ball bearings need preload depends on the specific application and operating conditions. It is important to consult with bearing manufacturers or industry experts to determine the appropriate preload for your specific application.
Single-row deep groove ball bearings are the most common type of rolling bearing. The raceway grooves in the inner and outer rings form a circular arc cross-section with a slightly larger radius than that of the rolling balls.
In addition to open varieties, these bearings can have steel shields or come pre-lubricated with grease maintained by rubber seals installed on one or both sides. Snap rings are sometimes used on the outside diameter of the outer ring.
Cages are generally made of pressed steel, though large bearings and bearings designed for high-speeds may use machined brass cages.
