Google

Bearing

Bearing


         The bearing in its current form was developed towards the end of the 19th century. It was initially made by hand.

Nowadays, bearings are one of the most commonly used machine parts because their rolling motion make almost all movements easier and they help reduce friction.


 

Rolling bearings are machine elements and serve to support shafts and axles. Depending on their design, they absorb radial or axial loads and simultaneously enable rotation of the shaft or the components mounted on an axle. The force is transmitted via spherical or roller-shaped rolling elements. The advantages include the following points:

  • low friction even when starting from standstill.  
  • low cooling and lubrication requirements, grease lubrication usually sufficient. 
  • radial, axial and combined loading capacity achievable with little effort. 
  • almost backlash-free or preloaded operation possible. 
  • rolling bearings are available worldwide as ready-to-install standard part series

 

Rolling bearings and sleeve bearings

In a sleeve or plain bearing, the axle and the bearing move in opposite directions on a sliding surface. By contrast, the two components of a rolling bearing that move towards one another – the inner and outer rings – are separated by rolling elements. This design generates significantly less friction than a sleeve bearing.

Radial bearings and Axial bearings

Bearings can transmit loads in a radial direction or an axial direction and in many cases there is a combination of both radial and axial loads to transmit.

Both designs are available as ball bearings or roller bearings. The choice of bearing design depends upon the application in question.




Bearing Types

Rolling bearings are divided into different bearing types and designs. Based on the ball bearing which represents the starting point, the starting point for the technical development of rolling bearings, today there are a large number of bearing types used for very specific operating conditions. Any design of a rolling bearing, however, will be a technical compromise determined by a wide variety of criteria. Rolling bearings are selected according to:

  • the available installation conditions, 
  • the type and extent of the load,   
  • speeds or motion cycles in general,   
  • the required guidance accuracy of the machine and plant components, 
  • the rigidity of the bearings,   
  • the ambient conditions,   
  • the installation and removal options

A part from the technical parameters of a rolling bearing, such as static and dynamic load carrying capacity and permissible speeds, the bearing clearance or preload, the appropriate cage modification and the required lubrication method must be considered when selecting the bearing type.

 

Components

Bearings usually consist of the following components:

·         Two rings or discs with raceways

·         Rolling elements in the form of rollers or balls

·         cage which keeps the rolling elements apart and guides them

 

Inner Ring / Outer Ring

The inner and outer ring are usually made from a special high-purity, chrome alloy steel. This material has the necessary hardness and purity – both important factors for a high load rating and a long service life.
Special materials such as ceramic and plastics are also used. Although plastics cannot withstand extremely high temperatures, they are considerably lighter than steel. This makes them invaluable in sectors such as the automotive industry, where every gram matters.

 


Rolling Elements

Rolling elements are either ballsrollersconesspheres or needles. They are usually made from a special high-purity, chrome alloy steel. Special materials such as ceramic and plastics are also used.

The rolling elements roll on the specially formed raceways of the rings or discs and are kept apart and guided by the cage.

 

Cage

The cage is responsible for keeping the rolling elements apart and guiding them. The materials used include steelbrass and plastic. Solid metal cages can be produced using machining techniques, while pressed cages are made from sheet metal. Similarly, plastic cages can be machined from solid plastic or injection moulded.

 


Bearings Prefixes & Suffixes

*Prefixes are mainly used to identify bearing rolling component.

*Suffixes identify special designs, variants & characteristics, which differ in some way from the original design or from the current basic design


Bearing suffix:

• Z. Steel shield on one side of bearing

• 2Z Steel shields on both the sides of bearing

• ZZ Rubber shields on both the sides of bearing

• K Tapered bearing bore in the ratio of 1:12

• W33: Lubricating groove and 3 holes on outer race

• W33X Lubricating groove and 6 holes on outer race

• C3 Normal bearing clearance (Clearance more than C2)

• C4 More bearing clearance (Clearance more than C3)

• J Pressed steel cage

•F Machined steel cage





Bearing Can be Identified based on their starting nos 

  • Ball bearings No’s start with 1&6.
  • Spherical roller bearings 2
  • Angular contact bearings 7
  • Taper roller bearings 3
  • Cylindrical roller bearings start with NU

 

Bearing Fail Reasons.

  • Over lubrication
  • More or less bearing clearance 
  • Jerk loads.
  • Bearing manufacturing defects.
  • Operating bearing at higher vibration and temperature for long time.
  • Wrong methods of bearing installation. 



Bearing Clearance 

Bearing clearance is the clearance or gap between outer race or inner race and rolling elements. And in journal bearings it is the clearance between shaft and bearing liners

Calculate the bearing clearance of bearing having bore diameter D 

As a thumb rule Bearing clearance minimum = 0.00185 X D

Bearing clearance maximum = 0.00254 X D

 

 

 

Thank You


Thermal Power Tech.

 

Website :

https://www.thermalpowertech.com/

 

YouTube :

https://www.youtube.com/channel/UC_jP2k154vrmS9kOfv4j1Cg?view_as=subscriber

 

FaceBook :

https://www.facebook.com/Thermalpowertech/

 

Twitter :

https://twitter.com/thermalpowert/

 

Instagram :

https://www.instagram.com/thermalpowertech/

 

Pinterest :

https://in.pinterest.com/thermalpowert/pins/

 

Linked In :

https://www.linkedin.com/in/thermal-power-tech-b72959194/

Bearing Bearing Reviewed by Thermal Power Tech on April 13, 2023 Rating: 5

17 comments:

  1. When I read your post I understood the correct use of different types of Flanges. If anyone is looking for high-quality fasteners, you can visit this official site at Inconel 625 Fasteners.

    ReplyDelete
  2. Authentic platform to find the leading nut bolt industry here. Deal with Sumit Impex for Quality UNS S32205 bolt | Stainless Steel 904l Fasteners | Din 2.4819 Fasteners etc. At true cost.

    ReplyDelete
  3. Great information on your blog. I also have some useful information about Stainless Steel 904L Seamless Pipe, I think this information will be very useful. Visit Steel Buildings here

    ReplyDelete
  4. I admire the exhaustiveness of the study which went into writing this post. The author did extensive research, and the result is a fascinating read.
    Super Duplex Steel S32750 Plates

    ReplyDelete
  5. This post is full of useful information. Let it continue. If you are looking for the best information and instructions related to SS 310 Band, visit Sonic Steels.

    ReplyDelete
  6. An important social issue is discussed in this article. It not only draws attention to the problem but also offers workable remedies.
    Copper Bonded Earth Rod

    ReplyDelete
  7. The article thoroughly introduces the topic without boring the reader with minutiae. It's well-balanced and interesting throughout.
    Inconel 600 Fasteners

    ReplyDelete
  8. This blog is truly helpful for providing up-to-date information on internet which is truly appreciated. I found a successful example of this truth through this blog. Also take a look at ASTM A312 SS 316 Pipe.

    ReplyDelete
  9. The paper had a logical progression from the first to the last section, which I appreciated. As a result, I had no trouble following the author's logic or understanding the paper's primary arguments.
    UNS S31803 Sheets Supplier

    ReplyDelete
  10. The article provides helpful hints and suggestions to solve the issue at hand. It encourages people to make changes for the better in their lives.
    309 Stainless Steel Shim

    ReplyDelete
  11. Bearings, the essential components in machinery, ensure smooth operation and minimize friction. Similarly, in the realm of academic writing, our Ph.D. thesis writing services serve as the bearings that enable a seamless research journey. With our expertise, we provide the necessary support to navigate the complexities of thesis writing, ensuring a frictionless process. Just as bearings enhance machinery performance, our services enhance the quality and success of Ph.D. thesis writing, empowering researchers to achieve their academic goals.

    https://www.theresearchguardian.com/services/thesis/phd-thesis-writing/

    ReplyDelete
  12. Actually many machinery like CNC Lethe and CNC Drill press has an option of gear changing but there are so many machine parts has alternate options. I am Content creator and just visit my website: https://www.theresearchguardian.com/services/thesis/phd-thesis-writing/ providing unique piece of content.

    ReplyDelete
  13. Flanges have always intrigued me, and your article about JIS flanges provided great insights. If anyone here is interested in top-notch plates feel free to visit 500 BHN Plates. Our wide selection could be just what you're searching for.

    ReplyDelete
  14. The details you've shared about JIS flanges have cleared up many doubts. For those interested in procuring high-quality plates or plates industrial supplies, our collection at Duplex Steel 2205 Plate could be worth exploring. Take a peek and find the perfect fit!

    ReplyDelete
  15. Flanges, as explained in your article about JIS flanges, have more complexity than I thought. If anyone here is searching for high-quality Stainless Steel 304 Pipe Fittings they should definitely consider checking out our range . There's a lot to choose from!

    ReplyDelete
  16. Bearings are critical components in machinery, enabling smooth rotational motion while reducing friction. They come in various types, including ball bearings, roller bearings, and plain bearings, each serving specific purposes. Choosing the right bearing ensures optimal performance and longevity of equipment. With proper maintenance, bearings contribute to efficient operation across numerous industries.

    ReplyDelete
  17. Fascinating stuff! Never realized how many different types of bearings there are and all the crucial roles they play. Thanks for the breakdown!

    ReplyDelete

Google

Powered by Blogger.