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About Ball Bearings
Ball bearings are used to provide smooth, low friction motion in rotary applications. Ball bearings types include Radial Ball Bearings (Deep Groove and Angular Contact) and Thrust Ball Bearings. Radial ball bearings are designed to carry both radial and axial (thrust) loads, while thrust ball bearings are designed for pure thrust loads only. Radial, or deep groove bearings, can take radial and axial loads to varying degrees but are used when the primary load is in the radial direction. They consist of an inner ring, an outer ring, balls and sometimes a cage to contain and separate the balls. Angular contact ball bearings are designed such that a contact angle between the races and the balls is formed when the bearing is in use. The major design characteristic of this type of ball bearing is that one or both or the ring races have one shoulder higher than the other. In order for these bearings to function properly, they must be assembled with a thrust load. This loading (or preload) creates a line of contact (or contact angle) between the inner race, the ball and the outer race. The preload can be built in to the bearing or created when the bearing is inserted into an assembly. The contact angle varies from 15° to 40° and is measured relative to a line running perpendicular to the bearing axis. Angular contact bearings are one-directional thrust bearings that can withstand heavy thrust loads and moderate radial loads. Thrust ball bearings are designed for pure thrust loads. These bearings can handle little or no radial loads. The rolling element can be a ball, needle, or roller. Slewing ring or turntable bearings can accommodate axial, radial and moment loads. They are not mounted in a housing or on a shaft, but instead are mounted directly to a seating surface. The inner and outer rings are supplied with mounting holes. The inner ring, outer ring, or both may have integral gears. These bearings are referred to as tabletop bearings, turntable bearings, and slewing rings.
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Engineering Web: Ball Bearings - Machine Design
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