Angular Contact Ball Bearings
Angular contact 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 bearing is that one, or both of the ring races have one shoulder relieved, or 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 into 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 unidirectional thrust bearings that can withstand heavy thrust loads and moderate radial loads.
Important dimensions to consider when searching for angular contact bearings include design units, bore, outside diameters, and outer ring width.
Design units can be in either inches or metric units. Some manufacturers may specify parts in both. The bearing industry uses a standard number system for bearings with metric diameter bores. For bore sizes 04 and up multiply by 5 to obtain the bore in millimeters. If the bore is a hex enter the dimension across the flats. If the bore is tapered enter the smaller diameter. The outside diameter of the bearing includes the housing if a housed unit, but excludes the flange if a flanged bearing.
Important operating specifications to consider when searching for angular contact bearings include rated speed, static radial load, and dynamic radial load.
The rated speed for a bearing running with grease lubrication is lower than a bearing with oil lubrication.
The static radial load is the maximum radial load bearing can endure without excessive permanent deformation.
The dynamic radial load is the calculated constant radial load, which a group of identical bearings with stationary outer rings can theoretically endure for a rating life of 1 million revolutions of the inner ring.
They can be relubricatable, prelubricated, and solid lubrication.
Bearing design for angular contact bearings can be one directional thrust, double direction thrust, double row, double row maximum capacity angular, duplex thrust, and four-pointed contact.
Styles of Seals & Materials
Angular contact bearings can have a number of different styles of seals or shielding. Seals and shields provide protection from contamination and as a retainer for lubricant. Seals provide better protection and lubricant containment than shields, but have lower maximum speed capabilities.
Angular contact bearings may be constructed of special materials including stainless steel, plastic, and ceramic hybrid. They may also be plated; common plating materials are cadmium and chrome.
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