The Single Row radial ball bearing has a single row of balls and can take pure radial, loads within its load capacity. It is widely used because it can operate at very high speeds due to its low torque and is cost-effective at an economical price.

As there is high degree of conformity between balls and raceways, the self-aligning capability of deep groove ball bearings is less, and therefore require well aligned bearing mountings. These bearings can be located endwise in both directions.

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.

Single Row Externally Aligning Ball Bearing

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.

Taper roller bearing types and characteristics

Taper roller bearings can take both axial and radial loads. The axial load carrying capacity of the bearings is largely determined by the contact angle α as shown in the figure below. If the contact angle α is larger, then the axial load carrying capacity is higher and vice versa.

Taper roller bearings are designed in such a way that vertices of the cone for each roller and those for the inner and outer raceways coincides on the bearing axis or extensions of the raceways and rollers converge at a common point on the axis of rotation. This results in true rolling motion of the rollers on the raceways at every point along the rollers. The taper roller bearings support radial loads and axial loads from one direction only. The line contact between rollers and raceways provide the bearings with a high load carrying capacity.

Steep angle taper roller bearing with exceptionally steep cone angle enables the bearings to take heavier axial load. The bearings are of separable type, enabling separate mounting of cups and cones.

Since the taper roller bearings can absorb thrust loads in one direction only, these bearings should generally be installed as opposed mountings. The correct amount of radial and axial clearance is obtained by adjusting the two bearings against each other.

Besides, double row and four row taper roller bearings are also widely used for heavy loads such as rolling mills. A single row taper roller bearing can be located endwise in one direction only.

In Double Row Taper Roller bearings, NBC provides both back-to-back arrangement (using double row outer rings) and face-to-face arrangement (using double row inner rings). These are adjusted to fix the clearance values of each type. Only parts with identical manufacturing numbers can be used and they must be assembled according to their code numbers.

Four Row Taper roller bearings are made up of two double row inner rings and two double row outer rings. These bearings are used for heavy load capacity as in the roller necks of rolling mills. The life of large bearings is extended by using case hardened steel, hollow rollers and pin-type cages.

NBC Taper Roller Thrust bearings include rollers that have conical sections. These bearings are designed primarily to support axial loads at contact angles between 30˚ and 90˚. These bearing are suited for applications where extremely high thrust loads like in crane hooks, coal pulverizer etc. These bearings can be supplied with a full complement of rollers. Applications for full-complement bearings should be reviewed by your NBC representative to ensure selection of the proper bearing.

Cylindrical roller bearings use rollers as rolling elements, and therefore have a higher load capacity in comparison to same dimension ball bearing. The rollers are guided by the ribs of the inner or outer ring. The inner and outer rings can be separated to facilitate assembly, and both can be fit with shaft or housing tightly. If there are no ribs, either the inner or the outer ring can move freely in the axial direction. Cylindrical roller bearings are therefore ideal to be used as so-called “free side bearings” that absorb shaft expansion. In the case where there is a rib, the bearing can bear a slight axial load between the end of the rollers and the rib. Cylindrical roller bearings include the ‘HT’ type which incorporates the modified shape of roller end face and ribs for increasing axial road capacity. And the ‘E’ type with a special internal design for enhancing radial load capacity. The E type is standardized for small-diameter sizes.

NU design:

The outer ring has two integral flanges while the inner ring has no flanges. Axial displacement of the shaft with respect to the housing can be accommodated in both directions.

N design:

The inner ring has two integral flanges while the outer ring has no flanges.

Axial displacement of the shaft with respect to the housing can be accommodated in both directions.

NJ design:

The outer ring has two integral flanges while the inner ring has one integral flange.

These bearings can locate the shaft axially in one direction only.

NUP design:

The outer ring has two integral flanges while the inner ring has one integral flange and one loose flange ring. These bearings can be used as locating bearings to locate the shaft axially in both directions.

RNU design:

NU-design cylindrical roller bearings without an inner ring.

NH design:

These are designed to stabilize NU- and NJ-type cylindrical roller bearings in the axial Direction.

NBC manufactures double row cylindrical roller bearings with both cylindrical bore and tapered bore.

Double Row Cylindrical Roller Bearings are widely used for applications requiring thin-walled bearings, such the main shafts of machine tools, rolling machine rollers, and in printing equipment. Internal radial clearance is adjusted for the spindle of machine tools by pressing the tapered bore of the inner ring on a tapered shaft.

The bearing components of Double Row CRBs can be mounted separately, facilitating efficient mounting, inspection and maintenance of these bearings.

NBC produces Four Row Cylindrical roller bearings in different designs and arrangements depending on the requirement of the application.

The variations are based on number of inner and outer rings, number of loose or integral flanges on the outer ring/ inner ring and type of cage design.

Four Row Cylindrical roller bearings are mainly used in the necks of rolling machine rollers – they are designed for maximum rated load to accommodate the severely limited space in the roller neck section of such equipment. In the event of a requirement where the bearings are mounted with a loose fit on the roll neck, the bearings are made with helical grooves in the bore or lubrication grooves in the side faces of the bearing rings so that the mating surfaces are efficiently lubricated.

Full complement cylindrical roller bearings integrate a maximum number of rollers without the usage of any cage and are therefore suitable for very heavy radial loads. However, they cannot operate at the same high speeds as caged design cylindrical roller bearings.

These bearings provide an average radial load rating increase of 20 percent and a life increase of 80 percent.

Thrust bearings incorporating cylindrical rollers are available in single row, double row Cylindrical roller thrust bearings are able to receive axial loads only, and have high axial rigidity which makes them well suited for heavy axial loads. Bearings with dimensions not listed in the dimension tables are also manufactured. Contact NBC for more information.

Spherical roller bearings are self-aligning bearings designed for heavy radial loading. The rollers are barrel shaped. These bearings automatically compensate for large angular errors commonly called shaft misalignments. They are usually of double row design, both the rows of the rollers having common spherical raceways in the outer ring. This feature has great practical importance in those cases where it is difficult to obtain exact parallelism between the shaft and housing both axes.

Spherical roller bearings are commonly found in Industrial Gear boxes, Conveyors, Cement Grinding Rolls, Sugarcane crushers and passenger coach axle boxes of Railways.

Spherical roller thrust bearings can accommodate heavy axial load, they are adapted to high speeds. These bearings are fitted with asymmetrical barrel shaped roller.

Under normal load conditions, the allowable misalignment is 1˚ to 2˚, although this will vary depending upon the bearing’s dimension series. These bearings use machined copper alloy cages and a guide sleeve is attached to the inner ring to guide the cage. The axial load capacity of these bearings is high, and a certain amount of radial load can also be accommodated when the ring is in an axially loaded state.

NBC has produced Axle Boxes for the railways since 1952. The company meets the complete requirements of the Indian Railways (one of the largest in the world) by designing and developing Axle Boxes and bearings for fitment to locomotives manufactured by Diesel Locomotive Works, Chittaranjan Locomotive Works, various other wagon builders, ICF broad and meter gauge coaches. Over a million NBC bearings and boxes are in service with the Indian Railways. The development of completely indigenized Axle Boxes and bearings for the high speed Rajdhani Locomotive, and the Yugoslavian and Egyptian Railway wagons are the highlights of the design capabilities at NBC.

Cylindrical roller bearings are used mainly in Locomotives (Diesel or Electric) for Wagons wheel application. These bearings are used with axle box housing and end fittings.

RANGE:

Axle Boxes with Cylindrical Roller Bearing for Wagons ( 4 Inch Bore to 12.60 inch OD)

Double Row Cylindrical Roller Bearing (Sealed Unit) (6.0 Inch Bore to 12.60 inch OD)

Cartridge Taper roller bearings with technology from Brenco, USA, have the outstanding property of requiring no field lubrication. They are mainly used in various wagons like BOXN, BCN, BTPN, etc. designed by the Indian Railways. For fitment to these Wagons designed by the RDSO, NBC is the only manufacturer in India to indigenize these bearings under collaboration with BRENCO the largest manufacturer of these bearings in the world. For some special applications, these bearings are also used as Wheel bearings for Locomotives (GM Locomotive).

RANGE: 6-1/2×12 Class `F’,6×11 Class ‘E’ & 5-1/2×10, Class ‘D’ Cartridge Tapered Roller Bearing for Wagons (5.19 Inch Bore to 9.96 Inch OD).

Belt tensioner is located in the front of an internal combustion engine. It provides tension to the belt which drives from the crankshaft, to the cam shaft, alternator, air compressor, power steering pump, and water pump. It must handle high temperatures, high-speed rotation, and belt vibration because of contiguity in the engine used in order to make the direction of a belt change. These bearings are designed against different specification from normal deep groove bearings.

Clutch Release bearings from NBC are designed for engagement and disengagement of clutch in commercial vehicles and tractors. The bearing reduces friction between the pressure plate levers and the release fork it has a front cover made of special heat-treated steel, for wear resistance during clutch engagement. Special assembly and controls are employed for cup caulking and closing with the front cover to prevent the relative rotation of front cover. Fitted with special accessories to prevent external contamination, the bearing is a sealed unit pack with a lubricant.

Mainly single row Tapered Roller Bearings are used as suspension bearings. These bearings are used with suspension tube housing and end fittings. For some special applications, cylindrical roller bearings are also used as suspension bearings (ABB Locomotive).

RANGE:
Single Row Cylindrical Roller Suspension Bearings (8.7 Inch Bore to 17.40 inch OD)
Single Row Tapered Roller Suspension Bearings ( 8.7 Inch Bore to 14.13 Inch OD)

NBC has partnered with ConMet of USA to manufacture Pre-Set Hub assemblies for Heavy commercial vehicle applications. Preset hubs utilize pre-adjusted bearings to facilitate proper installation, extend seal and bearing life and ease maintenance. Almost 90% of the heavy trucks in North America use the preset hub technology. A preset hub is a pre-adjusted but serviceable assembly. The individual components of a preset Hub (Seals or bearings) can be replaced as needed. The product offers the right balance between cost, performance & weight for different applications. This technology offers major benefits such as:

Reduced assembly labor
Lower maintenance costs
Elimination of failures due to bad bearing adjustments
Minimizes risk of assembly damage or incorrect assembly of seals

One of the critical areas related to automobiles today is the conservation of natural resources. In a vehicle, only about 12.6 % of energy is used for moving the vehicle whereas 62% is lost to engine friction, engine-pumping losses and to waste heat, 17% is lost in idling, 2% lost in accessories operation and 5.6% lost in the drive train due to friction and slippage.

By understanding the various torque contributors to the bearing such as grease, seal and internal bearing geometry, NBC has developed the low torque bearing technology. The low torque grease has been developed by various fundamentals on tribo-meter along with design of low torque seal and optimization of internal geometry to improve fuel efficiency. Low torque bearings reduce friction by 15-20% and improve fuel efficiency.

NBC has engineered fuel efficient bearing for transmission and wheel bearing application of two wheeler segments. These bearings have also been developed for other automotive segments (cars, trucks, tractors, etc.) Various other programs are underway as well and NBC is working towards extending the technology to other areas.

Since 1952, the company has fully met the requirements of the Indian Railways (one of largest systems of the world) by designing and developing axle boxes and bearings for fitment to locomotives manufactured by Diesel Locomotive Works, General Motors Locomotives, Chittaranjan Locomotive Works, the ICF broad and meter guage coaches, as well as various wagon builders. Over a million NBC bearings and boxes are in service with Indian Railways. The development of completely Indigenous axle boxes and bearings for the high speed Rajdhani Locomotive, the Yugoslavian and the Egyptian Railway Wagons are the highlights of the design capabilities at NEI. Today more than 100 types of axle boxes and bearings are being manufactured.

The manufacturing of spherical roller bearings was started in the year 1975 – 76 for fitment to broad gauge and meter gauge passenger coaches with designs, technology, machines and equipment procured from the collaborators.

For fitment to the new BOX-IN Updated Wagons designed by the RDSO. NEI is the only manufacturer in the country to indigenise these bearings to a high percentage in collaboration with the largest manufacturer of these bearings in the world. Production of these bearings commenced in the year 1984. These bearings are grease packed and require no field lubrication for a period of 7 years.