Posts Tagged ‘NTN’

NTN Spherical Roller Bearings for Aggregate Equipment

Friday, August 8th, 2014

In the Aggregate Industry, it’s only fitting that bearings can comply with the rigorous requirements. There are potential mishaps every step of the process, from heavy loading and high-misalignment to extreme contamination.

The demands of high loading, severe misalignment, and extreme contamination applications are always present. Some failures are even imminent at some point. That said, the design and production of bearings should meet those specific needs.

Whether your requirements are for the mining industry, construction, agriculture or almost any other industry, there are bearings that could actually deliver.

NTN is one of the most trusted brand names in the market. With years of experience, their extensive and in-depth knowledge of bearing applications have yielded an incessant growth of their product portfolio.

More to products built for the aggregate industry, NTN also has one of the widest arrays of super precision and precision grade ball and roller bearings available, along with other top-of-the-line mounted bearing units and a full line of constant velocity joints for half-shafts and propeller shafts.




Development of “Handheld Diagnostic Device for Bearings”

Friday, June 6th, 2014

Traditional bearing diagnostic devices that we’re accustomed to calculate and analyze measured vibration data within the device itself and display the outcomes. A big disadvantage is their size, being too big to be carried around on top of other things.

The “Handheld Diagnostic Device for Bearings”, which was developed by NTN, makes use of a smartphone in sending vibration data through the Internet to a server for calculation and analysis purposes. The smartphone also displays the input and output, paving the way for an immensely compact as well as portable vibration measurement system.

This system consists of the vibration pickup along with the pocket size AD converter (device that converts analog electrical signals to digital electrical signals) sold by NTN, and a smartphone.

The customer’s smartphone, which has the special app, sends the measurement data, through to NTN servers with the use of a specific ID and password. This is then analyzed with FFT (method utilized in diagnosing and analyzing input signals using Fast Fourier Transform to get the frequency spectrum) so as to know if a bearing is operating smoothly or not. If it shows any signs of malfunctioning, the area that’s acting up can be determined.

Select people will be asked to test the “Handheld Diagnostic Device for Bearings” so as to monitor usage for further improvements and other feedback. The plans to begin official sales start from the middle of this year.

NTN plans on expanding its aftermarket business through strengthening its technical services like bearing diagnosis and analysis.

Bearings Incorporated has an extensive Library

Thursday, August 26th, 2010

Our library at Bearings Incorporated is extensive, and we have records from back to the 1920’s.  We have a wide variety of vendors, products, and ages of catalogues.

Even with the many vendor changes throughout the years.  Timken has now bought Fafnir, Torrington, and National Oil Seals.   SKF has purchased Chicago Rawhide seals, and MRC bearings.  SNR Bearings is now NTN.  We are current with the catalogues of today, we also have the accessibility to  refer to the old references as well.  

If you have a Victor seal in your equipment, even though they are no longer in business; don’t despair; we still have the interchange catalogues and may be able to find a suitable replacement.  Our cataloges refer back into the 1920’s, and we have shelves of historical reference catalogues.

Design and Characteristics of Ball and Roller Bearings

Tuesday, August 17th, 2010
NTN Catalogue – Part 2 of 2

Continued from Part 1 of August 12, 2010

DOUBLE ROW SELF-ALIGNING BALL BEARINGS utilize an inner ring with two rows of balls, in two deep raceways; and an outer ring with a single spherical raceway.  In this way, the inner and outer rings can be misaligned relative to each other.  The resulting affect is a comparatively large angle imposing moment loads upon the balls. 

The boundary dimensions of the 1200 and 1300 series are the same as the 6200 and 6300 single row deep groove bearings.

CYLNDRICAL ROLLER BEARINGS have rollers which are essentially cylindrical in shape.  This provides a modified line contact with the cylindrical inner and outer ring raceways, while the rollers are guided by ground ribs on either the inner or outer ring.  The cylindrical shape allows the inner ring to have axial movement relative to the outer ring (except the NH type).  This is especially important when accommodating thermal expansion when both rings must be press fitted. 

In this series, the NJ, NF, and NH types can carry light or intermittent thrust loads.  The bearings utilizing machined bronze cages are suitable for high speed operation.

The NN3000 and NN3000K series are available in high precision tolerances and are well suited for use in machine tool spindles.

TAPERED ROLLER BEARINGS utilize conical rollers and raceways arranged so that the rollers and raceways meet at a common apex.    The rollers are guided by contact between the large end of the roller and a rib on the inner ring.  This provides high capacity for radial and single thrust loads.

SPHERICAL ROLLER BEARINGS have two rows of rollers in separate raceways which allows the bearing to compensate for angular errors.  They have large radial and thrust load capacity for heavy shock and impact loads, suitable for heavy industrial equipment.

DUPLEX BEARINGS use a set of two on a common shaft with the inner and outer rings clamped solidly together.  They are used to gain axial shaft control, rigity and extra capacity.

There are three fundamental combinations n duplex bearings: face to face (DF); back to back (DB); and tandem (DT).

The back to back mounting (DB) has the load lines through the balls converging toward the outside of the bearing.  This arrangement is preferred when the pair of bearings is to resist moment loading.

The face to face mounting (DF) has the load lines through the balls converging  towards the axis of the bearing.  This arrangement is less sensitive to slight angular errors in mounting of the bearings.

The tandem mounting (DT) is arranged so that the load lines through the balls are parallel to each other.  This mounting is used when it is desired to divide a heavy thrust load between the two bearings.  Since this mounting carries thrust load in one direction only, a third bearing should be provided to take thrust load in the reverse direction.

SINGLE DIRECTION THRUST BALL BEARINGS consist of two washers having ball grooves ground into their adjacent faces with balls and cages mounted between these grooves.  They are normally equipped with either pressed or machined cages and are suitable for carrying thrust loads at moderate speeds.

DOUBLE DIRECTION ANGULAR CONTACT THRUST BALL BEARINGS are back to back duplex bearings with a larger contact angle than that of normal angular contact ball bearings. 

These bearings have been recently developed, and are primarily designed as thrust bearings for machine tools.  They utilize machined brass cages. 

SPHERICAL ROLLER THRUST BEARINGS are similar to double row spherical roller bearings, but have a greater contact angle.  They are guided by ground flanges on the inner ring and operate against the spherical raceway in the outer ring.  The contact angle is approximately 45⁰.  Machined cages are normally used and oil lubrication is recommended.

Design and Characteristics of Ball and Roller Bearings

Thursday, August 12th, 2010
NTN Catalogue – Part 1 of 2

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.

To be continued August 17, with Double row self-aligning ball bearings, Cylindrical roller bearings, Tapered roller bearings, Duplex bearing, Single direction thrust ball bearing, and double direction angular contact bearings.

See Part 2

Counterfeit Bearing Seizures … on the rise

Thursday, August 5th, 2010

Counterfeit or illegally produced bearings are entering this country at an increased rate.  The Department of Homeland Security has seized ten shipments of counterfeit bearings already this year compared to only two seizures between 2000 and 2008.  Why the alarming increase in counterfeit product?  Bearings are a highly valued commodity.  In an effort to reduce costs in a slowing economy, many companies have tried to purchase bearings from unauthorized vendors.  While some of these vendors import product legally, many import product legally, many import product from unknown sources.  These companies claim to be factory authorized providers of legitimate product.  Nothing could be further from the truth!

Globally, NTN is a charter member of the World Bearing Association (WBA).  The WBA has helped to coordinate several raids in China where over 80% of the counterfeit product seized by the US Customs originated from.  In August, the WBA organized raids in China through local officials on nine bearing factories and six warehouses siezing over 950,000 counterfeit bearings/boxes involving seven different trademarks and companies.  The WBA is also working to help educate users of the dangers of using counterfeit product.

In the United States, NTN has joined the anti-counterfeit working committee within the American Bearing Manufacturers Association (ABMA).  This committee will work to help educate the US Customs personnel to enhance their ability to recognize counterfeit product as well as to educate the distribution and end user community on the dangers in using conterfeit product.

NTN is currently working with US Customs.  In 2009 NTN had helped them seize two shipments of counterfeit NTN branded bearings.  They dispatched an engineer to the port of entry where he was able to verify that the produt was indeed counterfeit! They are in the process of taking legal action against the importer.  The packaging was a very good replication of NTN packaging, however, their engineers found the product to be very poorly made.

After speaking with a few of our sales representatives from different companies; this is a serious problem plaguing them all.  What can you do to help?  Help promote awareness of this issue to end users and encourage end users to only purchase product fom authorized distributors.  Please remember, if the price is too good to be true, it is probably counterfeit.

Watch for future counterfeit industrial parts blogs.