Rolling bearings & its types
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Basic Types Of Rolling Bearings There are four basic types of rolling bearings: deep groove ball bearings, taper roller bearings, cylindrical roller bearings, and spherical roller bearings. Each type has a distinct design and is suited for different load characteristics. Deep groove ball bearings are the most common and can handle radial and axial loads. Taper roller bearings can handle both radial and axial loads. Cylindrical roller bearings are designed primarily for radial loads. Spherical roller bearings can handle misalignment and high speeds/loads. Rolling bearings are identified using designation systems which indicate type, dimensions, and other specifications.
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Rolling bearings & its types
- 1. Basic Types Of Rolling Bearings
- 2. 27 April 2020 Disclaimer The material and Information contained here are for general information purpose only. You should not rely upon the material or information provided herein for any basis for making any business, legal or other decisions. Fair usage: This material might contain some copyrighted material, the use of which has not always been specifically authorised by the copyright owner. We have given the source information, wherever available. While we make every endeavour to keep the information accurate and correct, National Engineering Industries Ltd. makes no representations and warranties of any kind either express or implied about the correctness, accuracy, suitability, reliability or productivity with respect to information or concepts contained in the presentation for any purpose. Any reliance on such material is solely at your risk and consequences.
- 3. Rolling Bearings – As per the shape of rolling elements Basic Types Of Rolling Bearings Ball Taper Roller Cylindrical Roller Spherical Roller Deep Groove Ball Bearing (DGBB) Taper Roller Bearing (TRB) Cylindrical Roller Bearing (CRB) Spherical Roller Bearing (SRB)
- 4. Deep Groove Ball Bearing
- 5. Design Features • Deep Groove Ball Bearing(DGBB) are the simplest and most widely used bearings • Available in various sizes and unique features • The bearing is made of four basic components; Inner ring / Outer ring / Balls / Cages • They are non-separable by design and are suitable for high speeds • They can carry mainly radial load and also axial loads in both directions • Available in Open type / Pre-greased with metallic shields or rubber seals Deep Groove Ball Bearing
- 6. Applications • They are most widely used bearings Deep Groove Ball Bearing • Ceiling fans • Home appliances • Pumps & motors • Power tools • Small engines • Small gearboxes • 2W/3W/4W
- 7. Bearing Sealing • Bearings are to be protected against contamination like dust, dirt or moisture • Sealed bearings are pre-greased and fitted with either metallic shields or rubber seals • Medium temperature grease is being used for general applications • Standard pre-greased bearings are filled with normal fill grade; up to 35% of the free space • However, special greases are available for specific applications; High temperature/ Wide temperature / Low noise Deep Groove Ball Bearing
- 8. Bearing Sealing Deep Groove Ball Bearing Metallic Shielded Bearing • Pre-greased with metallic shield • Non-contact type • Low friction; Higher speed • Fair protection against dust Rubber Sealed Bearing • Pre-greased with rubber seals • Contact type • Fair friction; Fair speed • Very good protection against moisture/water
- 10. Design Features • TRB is a unique bearing designed to take combined load • The bearing is made of four basic components; Inner ring (Cone) / Outer ring (Cup) / Taper rollers / Cage • They can carry both radial and axial loads referred as combined load • Available in various sizes in single row, double row, four row and cartridge type • Available in Open type / Paired type / Integrated with grease & seals Taper Roller Bearing Single row TRB Double row TRB Four row TRB Thrust TRB Cartridge TRB
- 11. Taper Roller Bearing True Rolling Motion • When the lines from cup, cone and rollers are extended, they meet at point on the axis. It is called apex • This is achieved through precision grinding and super finishing process • True rolling motion helps to have a perfect rotation of all the components with least friction • This is a unique feature of TRB , helping to have least or no slippage of rollers Apex True Rolling Motion When a perfectly ground taper roller is made to roll on a surface, it comes back to its original position without slippage. Taper roller Rolling path
- 12. Applications • TRB is a versatile bearing capable of taking both radial and axial load efficiently Taper Roller Bearing • Automotive hub assembly • Industrial gearbox • Small gearbox • Differential gearbox • Transmission box • Railway wagon wheels
- 14. Design Features • Cylindrical Roller Bearings (CRB) are designed to take mainly radial loads used in many industrial applications • They are known as separable bearings. Inner and outer rings can be separated for ease of mounting • The bearing is made of four basic components; Inner ring / Outer ring / Cylindrical rollers / Cages • Bearings with many different cross sections are available; N / NU / NUP /NJ /NH types • They are available in single , double and four row design. • Bearings without cage are called as Full Complement bearings with higher load carrying capacity Cylindrical Roller Bearing Single row CRB Double row CRB Four row CRB Full Complement CRB Thrust CRB
- 15. Different cross section designs; • Different cross section design is achieved by selectively providing ribs on inner or outer rings • These CRBs can be used as • Locating bearing ( also known as fixed bearing) • Bearing location is fixed on shaft and in the housing. Takes both radial and axial loads • Non-locating bearing (also known as floating bearing) • Allows to float during thermal expansion. Takes only radial load. • Semi locating bearing • Takes radial load and axial load only in one direction. Allows expansion only one direction. Cylindrical Roller Bearing
- 16. Applications • CRBs are designed to take heavy radial loads with moderately high speed capability Cylindrical Roller Bearing • Heavy duty industrial motors • Industrial gearbox• Heavy duty equipment • Railway axle boxes
- 18. Design Features • Spherical Roller Bearings (SRB) are equipped with two rows of spherical rollers • They are designed to take misalignment in the application with self aligning feature • The bearing is made of four basic components; Inner ring / Outer ring / Spherical rollers / Cages • They are non-separable by design and are suitable for high radial loads and high speeds • Thrust SRBs are designed to take axial loads Spherical Roller Bearing Spherical Roller Bearing Thrust Spherical Roller Bearing
- 19. Design Features • Spherical Roller Bearings (SRB) are available with straight bore and taper bore • Taper bore bearings helps in easy mounting and dismounting • Adaptor sleeves or Withdrawal sleeves are used to mount taper bore bearings Spherical Roller Bearing 1 12 1 30 SRB with taper bore 1:12 taper represented by K in the bearing designation 1:30 taper represented by K30 in the bearing designation
- 20. Applications • They are most widely used in industrial applications where the loads and speeds are high Spherical Roller Bearing • Paper industry • Wind mills • Passenger coach wheels• Heavy duty gearbox
- 22. General guidelines Bearing Designation System • Every bearing is marked with Alpha numeric number known as designation. It is to identify the type, bore, clearance and other special features • Typically the bearing designation comprises of three, four or five digit numbers with prefix and suffixes • The first number or letter represent the bearing type. • The last two numbers give information about the bore of the bearing • The second and third number refers to the dimensional series.
- 23. General guidelines Bearing Designation System DGBB TRB CRB SRB First digit 6 3 N 2 Last two digits represent bore 00 01 02 03 04 : 10 mm : 12 mm : 15 mm : 17 mm : 20 mm ( last two digits*5 = Bore. This is applicable after 03. Up to 96*5 = 480 mm) First digit code for other types 0 Double Row Angular Contact Ball Bearing 1 Self Aligning Ball Bearing 2 Spherical Roller Bearing 3 Taper Roller Bearing 4 Double Row DGBB 5 Thrust Ball Bearing 6 DGBB 7 Angular Contact Ball Bearing 8 Thrust CRB N CRB QJ 4 Point Contact Ball Bearing
- 24. General guidelines Bearing Designation System 6001 6201 6301 Example: Deep Groove Ball bearing • 6 represent Deep Groove Ball Bearing • Last two digits represent bore i.e. 12 mm • Second digits 0, 2, 3 represent width & OD • Refer catalogue for exact dimensions • As the second digit increases, load rating increases Understanding designations; Few examples.