Posts Tagged ‘tapered roller bearing’

Things To Know About Tapered Roller Bearings

Saturday, May 11th, 2013

Tapered roller bearings refer to bearings that are able to take large axial forces and can sustain large radial forces. To do this, they make use of conical rollers and raceways. They are arranged in order for the rollers and raceways to meet at a common apex. Such rollers are guided by contact between the large end of the roller and a rib on the inner ring. This gives rather high capacity for radial and single thrust loads.

If you go for premium brands, you can rest assured you get premium quality.

Look for tapered roller bearings that have case-carburized components. Cups, cones, and rollers are composed of case-hardened alloy steel of “Bearing Quality” so as to give first-rate fatigue life and consistency. Accurate control of heat treatment, dimensions, and surface finish of the components only add up to the reliability of bearings. You should also aim for having premium steels and heat treatments for extended life and reliable performance.

When you chemically augment the surface chemistry of the roller, you can produce a thin layer of retained Austenite, which brings about compressive stresses that boost the lifespan of bearings.

There are unique micro-pitting surface finishes that boosts bearing life in applications with insufficient lubrication. Based on the theory that oil film formation in bearing contact areas can actually be enhanced through altering the character and direction of the components’ surface finishes, the distinguishing micro-pots can efficiently capture and channel oil to where it’s called for.

Crowned rollers under load distribute stress equally along their full length of contact with the raceways. That being said, they eliminate stress concentration at the roller ends. This design concept also makes up for minor misalignment between shaft and housing bore and deflection under load, in turn lessening stress concentration.

Applications for tapered roller bearings are typically utilized for moderate speed, heavy duty applications in which durability is needed. Common real world applications include agriculture, construction and mining equipment, axle systems, gear box, engine motors, as well as reducers, among others.

Timken’s Mark Ward – Meet the Engineer

Saturday, February 23rd, 2013

The Timken Company now presents a brand new line of Type E tapered roller bearing housed units that set a new performance standard when it comes industrial bearings. They come with newly improved performance bearings lip seals, corrosion-resistant housings and locking collars. These features have advanced operating levels as compared to current industry top designs utilizing standard Timken bearings, along with 55 percent longer design life, 10 times more sealing ability, as well as more advanced corrosion resistance.

Timken Bearings- Quality and Performance Come Standard

Friday, July 22nd, 2011

The Timken name stands for high quality and outstanding performance.  Using their capabilities in bearing technology, manufacturing, engineering support and distribution, they provide their customers with smart, cost-effective friction management and power transmission solutions that help outperform the competition.

Expanded Housed Unit Offering

From the manufacturer that brought you reliable Fafnir® ball bearing housed units and Timken® SAF® pillow blocks comes a growing line of roller housed units. We’ve expanded our offering to include Timken® Type E housed units featuring our own advanced tapered roller bearings and seals.

The latest innovation is their  new series of Timken®

Type E roller housed units. Timken engineers have applied more than 110 years of expertise in bearing design — and leadership in tapered roller bearings — to bring you an optimized performance tapered roller bearing housed unit. They have improved thier own design to create the new standard in performance.

The Timken brand stands for outstanding quality in everything they do, from product design and manufacturing to engineering support and distribution.

Timken’s commitment to quality, service and delivery adds up to an unbeatable value for customers everywhere.

Quality Solutions

As the only premium bearing manufacturer to also make super-clean, high-alloy bearing steel, Timken knows how critical quality materials are to product performance.

They have also implement the Timken Quality Management System in every plant worldwide, so each bearing product meets the same high performance standards — no matter where in the world it is manufactured.

Dependable Service

Their roller housed units are backed with the service of Timken’s industry-leading experts who are ready to assist you with product design, application knowledge and 24/7 field engineering support — anything you need to help improve uptime and maximize equipment performance.

On Time Delivery

Timken Bearings know short lead times are critical to keeping your operations up and running. Many of their Type E roller housed units are in stock for immediate shipping. For special orders, They work quickly to manufacture and deliver your products on time.


Timken Primary Processes / Thermal Treatment Processes

Wednesday, July 6th, 2011



Hot rolled tubing has a surface finish comparable to hot rolled bars, plates or sheets of equal thickness. Light mill oxide covers both the outside and inside surfaces. Hot rolled tubing can be produced to outside diameter and wall dimensions with stated tolerances.

When a quotation for this highly specialized product is requested, we work closely with the customer to gain as much knowledge as possible about the end use. This enables us to apply materials with optimum dimensions to reduce costs.


Cold drawn tubing is produced from hot rolled tubes that have been carefully inspected and properly surface-conditioned. Cold drawing consists of pulling a tube through a die and over a mandrel, reducing the diameter and wall thickness. Tubing is cold drawn for one or more of the following reasons: closer dimensional accuracy, better surface finish, smaller sizes than can be hot rolled, or to achieve certain mechanical properties. Cold working also imparts higher strength to the tubing and tends to improve machinability of carbon and lean-alloy steel.

ROTOROLLING®(Cold Pilgered)

Rotorolled tubing is produced from hot rolled tube shells that are conditioned for further reducing. Rotorolled tubes are produced on a machine designed to make large reductions of the cross-sectional area in one pass of the tube. The machine operates by cold swaging the tube between semicircular dies containing tapering grooves. The dies rock back and forth while the tube is advanced and rotated between rocking cycles over a long tapering mandrel. The developed contour of the die grooves forms a tapering circular pass that ends in a constant-diameter ironing section that establishes the OD of the finished tube.

Rotorolled tubing is a premium product with a surface condition superior to those obtained by cold drawing. Machinability is excellent. Dimensional tolerances are very uniform. Our ability to obtain large reduction ratios allows superior mechanical properties to be achieved.

Wall thickness of up to one-third of the outside diameter can be produced.


ROUGH TURNING                           

 Turned tubing is produced by machining the outside surface of the hot rolled tubing. This process removes surface defects and decarburization from the outside, but the inside diameter surface retains the hot rolled finish. This is accomplished in a machine where the tools are mounted in a ring and rotated around the tube. The only motion of the tube is lateral, through the ring and past the rotating tools. Turned tubing is used extensively in automatic screw machines for manufacture into ball and roller bearing races and for special applications where advantages can be taken of the close outside tolerance or clean outside surface. Any hot rolled size up to 8 inches OD can be rough turned. Surface finish approaches 125 RMS or better.




Annealing is heating uniformly to a temperature within or above the critical range and cooling at a controlled rate to a temperature under the critical range. This treatment is used to produce a definite microstructure, usually one designed for best machinability. It is also used to remove stresses; induce softness; and alter ductility, toughness or other mechanical properties.


This is the standard process of air cooling the tubing immediately following piercing on a special table or hot bed that continuously advances the tubing as additional tubes are finished. Tubing that is hot bed cooled may require additional thermal treatment to obtain optimum machinability or required mechanical properties.


Mill annealing is a controlled cooling of the tubing immediately following piercing which produces – in some low and medium carbon alloy grades – the optimum hardness and microstructure for machinability.


In this process, steel is heated uniformly to a temperature at least 99° F (37° C) above the critical range and cooling in air to room temperature. This treatment produces a recrystallization and refinement of the grain structure and gives the product uniformity in hardness and structure.


Process tempering is performed to improve subsequent fabrication of the material (machining, cold working, etc.). See Tempering.


This processes heats steel uniformly to a temperature above the critical range and cools it rapidly in a liquid medium.


This special type of annealing requires an extremely long cycle. Spheroidize annealing is used to produce a globular condition of the carbide and maximum softness for best machinability in some analyses or to maximize cold formability.


This designates tubing that has been hot rotary straightened. Minimal straightening stresses develop in hot rotary straightening, so stress relief tempering is not needed. Cold rotary straightening and stress relieving can substitute for hot rotary straightening.


Stress relieving is a final thermal treatment used when stress-free material is desired. Its purpose is to restore elastic properties and minimize distortion on subsequent machining or hardening operations. This treatment is usually applied on material that has been heat treated (quenched and tempered). Normal practice is to heat to a temperature 99° F (37° C) lower than the tempering temperature used to establish mechanical properties and hardness.


Tempering heats uniformly to a temperature under the critical range, holding at that temperature for a designated period of time and cooling in air. This treatment is used to produce one or more of the following end results:

  • To soften material for later machining or cold working. Also referred to as a Process Temper.
  • To improve ductility and relieve stresses resulting from prior treatment or cold working.
  • To produce the desired mechanical properties or structure in the second step of a double

The Timken ISOCLASS Bearing Spectrum

Tuesday, May 24th, 2011
  • Standard IsoClass Bearings

The 30000 series bearings included in the original ISO/R355 standard, often referenced as DIN720, now constitute the core of the IsoClass line of metric bearings.

  • IsoClass Spacer Assemblies

A wide range of spacer assemblies is available for numerous applications in the original-equipment and replacement markets.

Most single-row standard IsoClass bearings can be supplied as a two-row, pre-set, ready-to-fit assembly by adding spacers machined to pre-determined dimensions and tolerances.

  • Customized IsoClass Bearings

Modified and flanged IsoClass bearings are indicated by prefixes and/or suffixes to the basic part number.  These bearings are not interchangeable with bearings sharing the same basic part number.

  • Modified IsoClass Bearings
    • Timken has developed modified ISO 355 bearing designs to meet specific application requirements.  These bearings have a modified external configuration or internal geometry.
    • Flanged IsoClass Bearings
      • A variation on standard IsoClass bearings, the flanged outer race facilitates axial location and accurately aligned seats in a through-bored housing.

The ISO 355 international  metric standard defines dimensions and cup angles for single-row tapered roller bearings.  Originally intended to replace the ISO/R 355 standard, the new ISO 355 standard defined additional bearings and created new designation codes for the entire dimensional codes for the entire dimensional spectrum of ISO 355 metric bearings.

Because new designation codes for bearings that were in accordance with both the old and new standards.

With the Challenges ….

Thursday, May 19th, 2011

…. Of a new millennium, striking a balance among innovation, quality, performance and economics could be a formidable task for some bearing suppliers.  But not for The Timken Company.

For the past century, Timken has worked to blend these essential elements to create enduring value for their customers.  This focus, and the synergy between Timken’s steelmaking and bearing manufacturing organizations, adds up to a degree of product knowledge that is unsurpassed in the world.

Today, the measure of Timken’s success can be stated quite simply; Timken is the world’s largest manufacturer of tapered roller bearings.  They have led the bearing industry in nearly every significant technological advancement, manufacturing evolution, and material enhancement since Henry Timken first patented the tapered roller bearing in 1898.

Of course, maintaining this leadership position requires a full measure of dedication.  Stemming from the core of the Timken organization is a passion for quality in all that they do and a steadfast commitment to offer a spectrum of bearings and related services that add value to your own end product.

You will find this particularly true when it comes to our line of metric tapered roller bearings.


The Timken IsoClass brand was developed to encompass and expand Timken’s range of metric bearings – and provide you with outstanding value now and in the future.  The result is an extensive line of ISO bearings with more than 170 part numbers in the 30000 series readily available.

A closer look will show that Timken IsoClass bearings represent a commitment that reaches far beyond adopting a new brand.

For example, since 1996, Timken has invested more than $60 million in new plants and people to support the IsoClass product line.  They have added 30 part numbers to allow them to provide a full line of products to meet this important market’s needs.

In research and development, Timken has invested more than 50,000 hours to evaluate and develop  new and existing designs and 500,000 hours in performance testing.  They have expanded their metric manufacturing capacity with facilities in Italy and Poland joining our other plants in Brazil, Canada, China, France, Great Britain, Romania, and the United States.

Timken — Corporate overview

Thursday, March 31st, 2011

History of The Timken Company

For more than 100 years, Timken has focused on value creation for diverse industries and market segments. We deliver a variety of friction management and power transmission solutions for applications ranging from aircraft and automobiles to mining equipment and medical instruments.  We’ve grown considerably since our founding in 1899, but solving customer problems is still at the core of our business, just like it was when founder Henry Timken patented a tapered roller bearing design that made life easier for freight wagon operators and their mules.

The Beginning

Henry Timken, a St. Louis carriage maker, recognized that heavy freight wagons had a hard time making sharp turns. To solve the problem, he applied a tapered roller bearing design that could handle both radial (weight) and thrust (cornering force) loads. There were several customer benefits. First, the application ran more smoothly, reducing repair and replacement costs. In some cases, the bearings improved wagon performance so much that fewer mules were required to pull them. Finally, better cornering meant less chance of losing a load of goods. Always focused on customer benefit, Henry quickly realized that the tapered roller bearing could improve product performance in many other applications as well. He and his sons, H.H. and William Timken, quickly founded The Timken Roller Bearing and Axle Company and began building the business into what it is today.

Corporate Overview 

Wherever there is motion, you’ll find Timken at work. Timken is one of the world’s leading producers of highly engineered antifriction bearings and related products and services and alloy steel and components. We help create, transfer and control power, putting our friction management and power transmission technologies to work across a broad industry spectrum.

Timken has operations in 27 countries on six continents, and our team of 20,000 employees is dedicated to improving our customers’ performance in a variety of applications.