Design and Characteristics of Ball and Roller Bearings

SINGLE ROW DEEP GROOVE RADIAL BALL BEARINGS  are the most widely used bearings and utilize an uninterrupted raceway, which makes these bearings suitable for radial loads, or a combination of radial and thrust loads.  This design permits precision tolerances even sat high speed operation.

The cage in this bearing is pressed steel.  For high speed bearings, machined brass cages are available.  Bearings with locating snap rings are also available.

PRELUBRICATED BEARINGS have integral seal, or shields, which are packed with long-life grease.  In many applications, these bearings may be used without supplementary seals, closures, or protective devices.  This design offers the lowest possible manufacturing cost to the consumer.

The boundary dimension of this type is the same as the corresponding bearings without the seals or shields.

SHIELDED BALL BEARINGS incorporate securely fastened, steel reinforced, rubber seals, fastened to a groove on the outer ring.  Contact with the inner ring is by sealing lip (Contact suffix LLU). Or, non-contact with the inner ring is by labyrinth seal (non-contact suffix LLB) to provide positive sealing at all times.

SINGLE ROW ANGULAR CONTACT BALL BEARINGS  feature raceways with high and low shoulders.  These opposing raceways are designed to carry thrust load in one direction.

These bearings may be preloaded at the factory so that the correct preload will develop within the bearing.

The bearings in this series are assembled with a specific internal clearance so that they will have a specified contact angle under stress load.  The standard contact load used by NTN is 30⁰; bearings made to 40⁰contact angle carry the suffix B.

For high speed grinding spindles the 7000C, 7200C and the 7300C series are available.  They are high accuracy bearings with a 15⁰ contact angle, and phenolic resin cages for high speed operations.

DOUBLE ROW ANGULAR CONTACT BALL BEARINGS have an inner and outer ring with a double raceway.  The two rows are so related that the contact angle is similar to a pair of back-to-back single row bearings.  The 5200 and 5300 series offer continuous races, and can carry thrust loads in either direction.  Since the 3200 and 3300 series have filling slots, it is necessary to mount them with the thrust load acting against the un-notched face of the rings.

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Some Fun Facts about Bearings

While it’s true that bearings might not come up in everyday conversations, they may never be the theme at Bingo night, or even come up during a heated game of trivia – but there are definitely a few things about bearings you don’t yet know, and they are far from boring!

Bearings Aren’t New Nowadays

Yes, there are many new ways we’ve found to implement the handy little buggers, but that’s not to say bearings haven’t in fact been around a very long time.

It’s easy to think that bearings just sprouted up out of nowhere as modern technology has risen in the last 50 years, but they’ve been around far longer than that.

Thousands of years ago, the ancient Egyptians used a form of roller bearings to build massive structures such as the great pyramids.

Remains of Roman ships dating back to 40 BC have been found with wooden ball bearings that supported rotating tables.

Bearings are Uses Everywhere

Did you ever hear the phrase, “a spider has eight legs and there’s always one within eight feet of you?” It would be easy to guess the same is true for bearings.

If you take a quick look around, you will notice bearings are everywhere, all around you. They’re in water heaters, microwaves, computers, airplanes, satellites, telescopes, washing machines, skateboards, and the list goes on and on.

Bearings are Perfect spherical object

In shape and structure, that is.

If you were to take it upon yourself to attempt to file down a ball bearing – in the how many licks does it take to get to the center of a lollipop kind of way – your file would be guaranteed to wear out long before the ball bearing ever does!

Secondly, they’re perfectly round. For a fun comparison – if you were to expand a ball bearing to match the size of the Earth, you would notice that the ball bearing would be more round than the Earth itself. This has to do with centrifugal forces pulling at the Earth, making it an oblate spheroid rather than a perfect spherical object.

Bearings Won the World’s First Bicycle Race

According to the New World Encyclopedia’s history of bearings: In August of 1869, the first French patent for ball bearings was received by Parisian bicycle mechanic Jules Suriray. Shortly after that, James Moore came in first place in the world’s first bicycle race, the Paris-Rouen, in November of 1869. His first place medal was no doubt thanks to the new bearings that had been fitted to his bike.

We Once Declared War on Bearings

During the Second World War, factories in Germany that manufactured ball bearings were often targeted to be destroyed. Reason being, the bearings were an essential part of the war industry in Germany, and thus destroying them gave the Allies a much needed headway. Schweinfurt was one location of a major bearings manufacturing plant that was targeted.

Bearings Make the World Go ‘Round'

Global demand is pushing bearing manufacturers to churn out more product, faster, with ever more innovative designs. As consumers and corporations demand more from technology, and the bearings market continues to grow, we’re sure to see bearings play an important role in our future.

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How to Calculate Friction in a Sleeve Bearing

The friction present in a sleeve bearing depends upon several factors. For example, the constant value of the coefficient of friction depends upon what materials comprise the sleeve and bearing. Other important factors include the size of the shafts, the rotational speed and the lubricant viscosity. In a rolling-element bearing, its static friction (and the torque needed to overcome that force) usually exceeds its running friction. Consider all these factors to calculate friction in a given sleeve bearing.

Determine the materials of which the inner bearing and outer sleeve are composed. Refer to tables of standard coefficients of friction to determine a rough value for the coefficient of friction between those two materials in particular. Note this dimensionless constant using the greek letter "mu" (µ).

Determine the sizes of the bearing and of the sleeve. Note the radius of the shaft using the letter "R."

Subtract the area of the bearing shaft from the area of the sleeve to calculate the radial clearance between them. Note this clearance, using the same units as for R, but use the letter "c."

Determine the viscosity of the lubricant in the bearing. Note the force per area multiplied by time with the letter "P."

Determine the speed at which the bearing revolves in the shaft. Note the revolutions per second with the letter "n."

Multiply 2 by pi squared (π^2) by µ (the coefficient of friction) by n (the speed of revolution) by R (the radius of the shaft).

Multiply P (the viscosity of the lubricant) by c (the radial clearance between shaft and sleeve).

Finally, divide the value calculated in Step 6 by the value calculated in Step 7 to complete Petroff's equation. The result is the force of the friction present in the sleeve bearing.

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The Role of Bearings in Bicycle

The bicycle is a self-explanatory machine. Almost every part of it is there to be seen at a glance. So it’s all too easy to neglect or underestimate the hidden ball bearings which keep the moving parts on the move.In any mechanical device, where two bearing surfaces make frictional contact with each other, some means must be found of minimising the friction.

In many cases, a well-lubricated “plain” bearing will do the job, especially if the bush is of phosphor-bronze or some similar hard alloy. In the more advanced “ball” bearing, however, the load or thrust is borne by a number of hardened alloy-steel balls which are themselves free to move along a narrow circular channel or “race.” In a theoretically ideal ball-bearing, the load is concentrated at areas which are merely points. The steel balls are theoretically perfect spheres and therefore make direct contact with the opposing surfaces at two points, reducing the area liable to frictional wear to an absolute minimum. Also, as the balls themselves are of a specially-hardened steel and are free to move in a rolling manner, any slight amount of wear which they undergo during the course of time will be equalised over the entire surfaces of the balls. The balls, therefore, may ultimately become slightly reduced in size, but they will all be reduced equally; and thus they will keep their spherical shape, so that the working efficiency of the ball bearing is maintained.

In practice, ball-bearings are not perfect in their proportions, and signs of wear occur after a time. A
theoretically perfect ball bearing would need no lubrication at all. Since it is impossible to manufacture
absolutely spherical hardened steel balls, a true rolling motion of the balls within their race cannot be
guaranteed; and the ball-race itself is always slightly concave – this concavity increasing with wear. So
commercial ball-bearings must be lubricated.

*All ball-bearings in a bicycle should be dismantled and examined at the minimum once a year. Twice a year is much better. If the balls have not been adequately lubricated they will be worn sharp or rough, with small pits or depressions in the surfaces of the races. The best thing to do with such an article is to chuck it out.

Contact us
MBP BEARINGS PVT. LTD.
902/290, SHALIMAR INDUSTRIAL AREA,
NEAR LANE NO. 3,
MAIN ROAD, Delhi – 110088, India

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Top 5 Deep Groove Ball Bearings

1. RV Bearings
R&V Bearings Supplies is currently one of the leading importers and distributors of bearings and associated engineering accessories. We place great emphasis on product quality, service and professionalism since 1990 offering a 24Hr service in the event of a break down

2. Bearings Distributors
Bearings Distributors was established in South Africa in 1953. Initially the company was purely a trading concern and would purchase locally to supply it’s predominantly end-user based customers with various engineering spares. Over the years the markets changed drastically and with this the need for additional products and brands became a necessity to service the requirements of a rapidly growing customer base.

3. MBP Bearings
MBP Bearings Pvt. Ltd. is one of the leading manufacturers of hi-precision and hi-quality "MBP BRAND" anti-friction Bearings with exclusive range. Being a highly conscious company, we ensure the offered Taper Roller Bearings, Cylindrical Roller Bearings, Needle Roller Bearings, Spherical Roller Bearings, Angular Contract Bearings, Thrust Bearings, Clutch Release Bearings, SRDG and DRSA Ball Bearings. 

 4. Durga Bearings
Durga Bearings was established to be a one stop solution, offering world class bearings through partnering with leading manufacturers across the Globe.Since its inception in 1977, Our Founder Mr. M. P. Sultania set upon his dream in the form of Durga enterprises & he showed the seeds of leadership, hard-work & commitment.


5. ABX Bearings
ABX is a warehouse stocking bearing, seal and power transmission component and equipment distributor. We carry frictionless bearings of all styles and dimensions.

 

 

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Types of Rolling Contact Bearings

What is Bearing?

A bearing is defined “as a part of a machine that allows one part to rotate or move in contact with another part with as little friction as possible”.  Bearings may be classified broadly according to the motions they allow and according to their principle of operation as well as by the directions of applied loads they can handle.  Additional functions include the transmission of loads and enabling the accurate location of components.  A bearing may have to sustain severe static as well as cyclic loads while serving reliably in difficult environments.

Types of rolling contact bearings

1. Deep groove bearing: balls fit well into the deep grooves, enabling the bearing to sustain moderate axial loads in both directions in addition to radial loads. The bearing illustrated here has a single row of balls.

2. Thrust ball bearing: can support an axial load in one direction. Not designed to accommodate radial loads. The bearing components can easily be separated.  Barstools and Lazy Susan turntables use this type of bearing.

3. Tapered roller bearing: Both of the rings and the rollers are tapered in order to simultaneously support axial and radial loads. The ratio of the loads supported depends on the angle between the roller and bearing axes. A greater angle helps support a larger axial load.

4. Self-aligning ball bearing: two sets of balls run on a pair of grooves on the inner ring, with a single outer-ring concave surface, allowing the bearing to accommodate misalignment of the shaft.

 

 5. Angular contact ball bearing: This particular design of angular contact ball bearing is able to accommodate a large thrust load in one direction, in addition to radial loads.

6. Needle roller bearing: This has long and thin rollers – the design is suited for applications where radial space is limited.

7. Spherical roller bearing: Because of the angular contact between the rollers and raceways, the bearing is able to accommodate both axial and radial loads; the double set of rollers also permits the bearing to
accommodate shaft misalignment.  The rollers are not cylindrical, and hence the adjective `spherical’.

8. Cylindrical roller bearing: The cylindrical rollers are able to accommodate large radial loads. This is a
single-row bearing.

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Top 5 Pro Clutch Manufacturer in India

1. Nbcbearings.com
NEI was founded in 1946 by the renowned industrialist, Shri B M Birla, under the name of ‘National Bearing Company Limited’. The company commenced manufacturing in 1950 with an annual production of 30,000 bearings in 19 sizes.
http://www.nbcbearings.com

2. ARB-Bearings.com
ARB Bearings is India’s leading bearing manufacturer company. The company was incorporated in 1990 and its headquartered at Delhi. It is run by professionals with over forty years of experience in the bearing industries.With in a short duration since inception, the company has carved a niche for itself in various segments ranging from automobiles to industrial machinery to household appliances.
http://arb-bearings.com/

3. Peerbearing.com
PEER Bearing is a manufacturer and global supplier of reliable ball and roller bearing solutions to target industries. Our Target Industries served are: Agricultural, Distribution, Electrical, Fluid, Industrial Transmission, Material Handling and On Highway and Off Highway. We offer a full line of agricultural, radial, mounted unit ball and tapered roller bearings.
http://www.peerbearing.com

4. Grwbearings.com
GRW is the premier developer and manufacturer of ball bearings, assemblies and accessory parts utilizing state of the art equipment and manufacturing processes. We specialize in the production of high precision, small, miniature and instrument bearings as well as spindle bearings in addition to pre-assembled bearing units.
http://grwbearings.com/

5. Astbearings.com
Founded in 1963, AST® Bearings LLC is an ISO 9001:2008 certified company and a leading supplier of precision bearings and bearing related products across a large spectrum of customers - primarily OEMs and major distributors. We supply a wide range of industries such as aerospace, medical, food processing, green energy, robotics, high tech, industrial products and many more.
http://www.astbearings.com

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