A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the moving parts of the bearings - the inner and outer part of the bearings. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. Ball bearings are of simple design, durable in operation and easy to maintain. They are available in single and double row designs and in open and sealed variants. Due to their low frictional torque, they are suitable for high speeds. NBC manufactures a wide range of both metric and inch series deep groove ball bearings, angular contact ball bearings, self-aligning ball bearings among others, including Thermo Mechanical Bearings (TMB) for longer life and special heat-treated bearings for dimensional stability at high temperatures.
The Single Row Angular Contact ball bearings have higher axial load capacity than the Single Row Radial ball bearings.
The bearings can carry axial load in one direction only and are to adjusted against another bearing, if axial load is coming from both the directions. Each bearing can be located endwise in one direction only.
These bearings, when mounted in a duplex arrangement, provide axial and/or radial rigidity in applications where control of shaft displacement is essential.
Double Row Angular Contact ball bearings have raceways in the inner and outer rings that are displaced with respect to each other in the direction of the bearing axis. This means that they are designed to accommodate and simultaneously action axial and radial loads. Due to angular contact the axial load carrying capacity of angular contact ball bearings increases as the contact angle increases. The contact angle is defined as the angle between the line joining the points of contact of the ball and the raceways in the radial plane along which the load is transmitted from one raceway to another, and a line perpendicular to the bearing axis. These bearings can accommodate thrust in both the directions. The chief advantages of the double row type are rigidity, compactness and high capacity.
NBC has state of the art grinding and assembly lines from IZUMI, Japan for manufacturing Double Row Angular Contact ball bearings with low torque high performance seals.
The Single Row Externally Aligning ball bearings are used where accurate alignment cannot be ensured between bearing positions. This bearing type can mainly take radial loads. Axial loads can also be accommodated.
The shell housing must not be made an interference fit on their outside diameter. If an interference fit is used, the shell housing may contract and prevent alignment. These bearings can be located endwise in both the directions.
Double Row Self Aligning BalI Bearing
The Double Row Self-Aligning ball bearings have a common outer spherical race for both the rows. This feature gives the bearings self-aligning properties. The bearings have the same external dimensions as their equivalent single row radial ball bearings. They can take radial loads and very light axial loads. They can be located endwise in both directions.
Double Row Self-Aligning Ball Bearing with Tapered Clamping Sleeve and Nut
The Double Row Self-Aligning ball bearings with Tapered Clamping Sleeve and Nut, are identical to Double Row Self-Aligning ball bearings except that these have a tapered bore, which is used for easier mounting and also a clamping sleeve and nut to clamp the bearings on the shaft. The tapered bore is also used for the adjustment of radial clearance
The Thrust Ball bearings are used for high axial loads at low speeds. These cannot operate at high speed, when centrifugal or radial force cannot be handled by the bearings. They can be located endwise in one direction only.