Image Credit: ABT Bearing | Applied Industrial Technologies | SKF/North America
Insert bearings and wide inner ring bearings are used for mounting on shafts without the need for shoulders, locknuts, or adapters. The bearing is locked in place through setscrews or a locking collar. The inner ring usually extends on both sides of the bearing to provide extra shaft support.
How Insert Bearings Work
Generally, insert bearings are standard radial bearings that have been adapted to fit into a housing. Although they are generally sold with the housing, these bearings may also be purchased as stand-alone products to use as replacements. While standard radial ball bearings must be pressed into a machined shaft, using special installation tools, insert bearings can be slip fit directly onto the shaft. However, insert bearings are typically mounted onto shafts that are slightly smaller than the bearing bore diameter. This loose fitting necessitates a locking device to hold the bearing securely in place. The inner ring of the bearing is extended to one side to accommodate the locking device. In addition, the width of the insert bearings inner ring may vary according to the type of the bearing.
How Wide Inner Ring Bearings Work
A related style of insert bearings is the wide inner ring bearing. The wide inner ring, or double extended inner ring insert features an inner ring that extends beyond the width of the outer ring on both sides of the insert. The extension on one side accommodates a heavy-duty seal. The other side is extended even further to accommodate both a heavy-duty seal and the locking device. Wide inner ring insert bearings also distributes the load over the larger surface area created by the wider inner ring. These bearings are generally used for heavier duty applications. Some manufacturers create inserts that fall between narrow and wide inner ring inserts. By combining features of both they create a more economical "will-fit" that is neither a true narrow or wide inner ring.
In addition to allowing motion and support, many insert bearings are designed with seals to provide protection from contamination and as a retainer for lubricant. They may be designed with single or double seals, or single or double shields to prevent the ingress of dirt. However, open bearings, which lack shields or seals are also available. Open bearings offer no protection from contamination or lubricant containment, but have higher maximum speed capabilities than bearings with seals or shields.
Related Products & Services
Aerospace bearings are designed to meet the rigorous demands of aircraft control and aerospace applications.
Angular Contact Bearings
Angular contact bearings are designed so that a contact angle between the races and the balls is formed when the bearing is in use.
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.
Miniature Bearings and Instrument Bearings
Miniature bearings and instrument bearings carry moderate radial and thrust loads at low operating torque while providing high performance in a small envelope design. These types of bearings are single row ball bearings available in up to 1 1/8" outer diameter (OD) sizes
Needle Roller Bearings
Needle roller bearings are a type of radial roller bearing with rollers whose length are at least four times their diameter. These bearings are valued for their high load capacity and low sectional height.
Roller bearings are used in rotary applications to replace sliding movement with low friction, rolling motion. The principal types of roller bearings are cylindrical, spherical, and tapered.
Thin-section bearings have small cross-sections with respect to their diameter.