Rolling Element Bearings

In this post we are discussing the different types of roller element bearings.

This article discusses 5 types of rolling element bearings. In a previous article, we discussed the basic individual elements of a ball bearing where, and how they we manufactured, but just to recap, ball bearings are used in just about everything… from gearboxes and engines down to go-cars, skateboards and roller skates. We discussed the elements such as the bearing, the raceway and the cage.

Rolling element bearings are basically bearings which can roll on one or two more axis, either shaped into spherical balls or cylinders, which roll along a raceway. The load is placed on the bearings and the raceway and lubrication assists in keeping the joint moving and transferring the power.

Dunlop Bearings, taper roller bearings

The first type of roller bearing is the simple ball bearing. Ball bearings are perfectly round and placed in between the bearing race or raceway. The ball bearings round nature means it can move on any axis, therefore provides much flexibility when required.

Cylindrical bearings or cylindrical roller bearings, are shaped into cylinders, much like a can of lemonade. These bearings will only roll on one axis – back and forward. They are also placed within the bearings raceway. Spherical roller bearings are very similar, but have a rounded part in the mid section. Needle roller bearings are also similar, but the pins are rolled much longer and therefore have a needle like appearance. These needle bearings provide cover to the the entire surface of the raceway.

Tapered roller bearings are slightly different, While the bearings are in a cylindrical fashion, there is a taper on them, which gives them the cone-shape appearance. These enable for a diagonal planar movement. These bearings can withstand both radial and axial loading.

Roller bearing elements undergo a lubrication process known as elastohydrodynamic lubrication. This process involves the oil under the bearing becoming almost solid-like, and elasticates the bearing element for a moment. It’s vital to ensure the correct lubricant is used and that there are no contaminates in the system. In a previous article, on “5 reasons for bearing failure“, we discussed reasons for bearing failure and causes for manufacturing lines to be shut down. Please ensure that the environment is clean, bearings and fluid are designed to operate with the temperatures and humidity of the environment.

For all your bearing needs, please contact Hydra Seals, Hose & Bearings through our contact page or via phone on +353 1 8612700.

Dunlop Bearings, taper roller bearings

Dunlop Bearings Now In Stock

As you may know Hydra Seals are now premier distributors of the entire Dunlop Bearings range! They have several ranges to choose from including plain bearings, Spherical Bearings and ball joints, as weel as angular contact bearings. Here’s a quick reference to how bearings work.

Dunlop Plain Bearings (sliding friction)

Hydra Seals & Dunlop Bearings Plain, rod end, spherical bearings and ball joints

For plain bearings, sliding friction occurs when two surfaces, generally separated by a third medium such as PTFE, bronze, nylon or lubricant, move relative to each other.

Specific pressure is determined by the strength of materials selected, this historical principle is used for all types of plain bearings in their various applications.

The main advantage of plain bearings lies in their design and structure, they are frequently used in maintenance-free designs and require less space in a machines design. Dunlop bearings brand offer both quality and reliability.

Dunlop Rolling Bearings (rolling friction)

Angular contact bearings, self-aligning, thrust, cylindrical, taper, spherical bearings and bearing units from Dunlop

Rolling bearings work with the principle of rolling friction, the applied load is transmitted by rolling elements, rotating around and between two bearing rings, normally guided by ring raceways grooves. Usually the rolling elements are positioned within the bearing by separators, also termed retainers or cages. As described for plain bearings, rolling bearings also require lubricant separation of the metallic parts.

This, along with a good surface finish, ensures smooth running surfaces and reduces friction from the transmitted forces, resulting in minimal power loss. The principle distinction between rolling element bearings and their initial bearing description is generally classified solely due to the rolling element shape (e.g. ball or roller etc)

Watch this video to find out how tapered roller bearing work – as used in Agricultural machinery…

The differences between ball and roller bearings are also considered in the calculation formula for rolling bearings. Please contact us via our contact page for any information you might have about our range of DunlopBTL bearings.

ball bearings and ball bearing manufacturing

Ball Bearing Manufacturing Process

The Ball Bearing Manufacturing Process

The function of a Ball bearing is used to reduce rotational friction of a moving part. Bearings move along an area called raceways or races. One race is at rest in most of the cases and the second one is attached with rotating hub. When one of the bearings moves it also causes the balls to rotate along its rotation, as the ball bearings are rolling so they have very little friction, as compared to the situation when two flat bodies move on each other’s surface. This article will discuss the ball bearing manufacturing process. Here is a good guide on howstuffworks.com on how ball bearings function.

Ball bearings are used in many machines which we use everyday. Items such as fans, wheels, motors and even skateboards all contain bearings. The bearing is used to support rotatory parts of machines to enable smooth rotation. There are different kinds of ball bearings, with different sizes, due to the different machines they would be used in. Ball bearings are generally made from chrome steel mix

  • Linear Rails & Shafting’s
  • Linear Slides
  • Linear Bearings
  • Radial Spherical Bearings
  • Cam Follower Bearings
  • Needle Roller Bearings
  • Thrust Ball Bearings
  • Spherical Roller Bearings & Radial Spherical Ball Bearings
  • Tapered Roller Bearings
  • Cylindrical Roller Bearings
  • Angular Contact Ball Bearings
  • Self-Aligning Ball Bearings
  • Deep Groove Ball Bearings

To view our entire range of bearings and bearing blocks, they are listed on our bearings page – click here.

Ball bearing components:

Ball bearings consist of four main parts:

  • Outer Ring: Large ring situated outside.
  • Inner Ring: It is a small ring situated inside.
  • Steel balls: The balls between the two rings made up of steel.
  • A cage: There is a cage to prevent the balls hitting with each other.

Manufacturing Process:

Ball Bearing Manufacturing – Cutting:

The first step of the manufacturing process is cutting. Cutting machines are used to cut and shape the material into rings.

Ball Bearing Manufacturing – Heat treatment:

Heating process is used to increase the life and durability of ring shaped metals.

Ball Bearing Manufacturing – Grinding:

The parts need to be ground into shape and polished, and for this purpose small stones and a lubricant are used to the required dimensions, such as the outer and inner diameters and the width are ground to micrometer (one-thousandth of a millimeter) precision, as is the groove, a key internal structure formed between the inner and outer rings in which balls run.

Ball Bearing Manufacturing – Bearing Assembly Process:

The inner and outer rings, balls and cage; also known as a retainer, are assembled. Depending on the application of ball bearing lubricant like grease or oil is applied. After the lubrication process the ball bearings are covered with shields. This is the process in which parts are assembled according to customer needs.

In short ball bearings have to reduce the friction and they can be ranked quality wise, it depends on how much a ball bearing can reduce friction. The more it reduces friction the more it is better in quality. Another quality issue is durability. We will discuss the merits of good quality and not so good quality bearings in a future post.

Here is a good video on how ball bearings are manufactured. Originally screened on the Discovery Channel.

Hydra Seals Hose & Bearings are a distributor of high quality bearings from Dunlop BTL and all other major brands. Contact us on 01 8612700 or drop us a line on our contact page.

hydraulic hose. Hydraulic hose accidents from improper installation and badly fitted hydraulic hose fittings

Hydraulic Hose Accidents

Hydraulic Hose Accidents & Safety Measures.

Hydraulic Hose can be found in many industries from construction, aviation and of course in vehicles. This also includes farm machinery, of which we are all too familiar with. However, when hydraulic hose breaks, bad hydraulic hose accidents can happen!

You may be wondering what types of accidents would happen? Well we’d like to start to explain what fluids pass through hoses, which provide fluid power to machinery. Such fluids would include petrol/diesel, water, oil, coolants or other fluid with some water base all flow through a hoses inner tube. Now all these fluids are running through at various temperatures, and are quite often are at high temperatures. How if a hose were to burst, or a fitting were to break off, the fluid inside would cause serious burning, or could contain a toxic fluid or gas as a bi-product of a chemical reaction happening inside the tube. What if the working environment contains heavy duty electrical equipment, the possibility of electric shock is quiet real.  All hose needs to be flexible. Flexible hose has the ability to bend around corners.

Why would there be Hydraulic Hose Accidents?

As we said in a previous articles, hydraulic hose accidents and failures arise when the equipment or material are worn, not fitted correctly or have some form of damage to them. In the case of Hydraulic Hose, we see that the hose is kinked or bent beyond it’s recommended radius, or the outer material has been damaged by an object or environmental wear has occurred.

Incorrectly made hose, by those unqualified or in a poor working environment, can be cause for a badly made fitting. It’s important to ensure the correct amount of pressure is used with the correct size die in the cutting/swaging machine used to make the hydraulic or water hose. Ensure the correct size fittings are used, and that the hose and fittings used are recommended by your manufacturer or distributor. It’s also important to ensure that if you are getting your hose made by an outsourced party to ensure that they are insured, and are qualified to make the required hose under some recognised standard. If you are making the hose in-house, make sure that your staff are trained and qualified to the same standards.

Methods to prevent Hydraulic Hose Accidents?

1. Observation. Examine the hose. If you believe the hose is kinked, twited, punctured or damaged in anyway, please look to replace.
2. Use High Quality Hose from the likes of Stomil, and don’t mix and match different grades or specifications of hose.
3. Make sure correctly sized fittings are used and made off properly in the swaging machines.
4. Replace all hose before the end of life period as it is made from a rubber compound, which degrades over time.
5. Used qualified / skilled personnel to make the hose!

About Hydra Seals Hose & Bearings Limited

Hydra Seals carry are wide range of Stomil Hose in 100m reels and also supply high quality fittings from Tieffe. We also carry a wide range of swaging machines to enable onsite/in-house hose repair services. Hydra Seals have a walk in trade counter where we will repair or replace old hose to same standards, and are open 6 days a week. Contact us via our contact page to get in touch with us.