This document provides information about bearings: Bearings allow one machine part to support another and reduce friction between moving parts. The main purpose of bearings is to prevent direct contact between elements in relative motion and reduce friction, heat, and wear. There are two main types of bearings: sliding surface or 'plain' bearings, and rolling element or 'anti-friction' bearings. Plain bearings use a sliding surface while rolling element bearings use balls, rollers, or needles to reduce friction. The document then describes various designs within each category.

1. A Presentation on Bearing
Prepared By
Agastya Chandra Pandey

2. What is the bearing
 The term "bearing" is derived from the verb "to bear"; a bearing being a machine element that allows
one part to bear (i.e., to support) another part and reduces friction between moving parts
शब्द “Bearing” Verb "टू बियर" से लिया गया है; Bearing मशीन का एक हहसा है जो एक भाग को दूसरे भाग को
सहन करने (अर्ाात समर्ान करने क
े लिए) की अनुमतत देता है और घुमते हुए भागो क
े बिच में टकराव को काम
करता है l

3. What Is the purpose of bearing
 The main purpose of bearings is
to prevent direct metal to
metal contact between two
elements that are in relative
motion. This prevents friction,
heat generation and ultimately,
the wear and tear of parts. It
also reduces energy consumption
as sliding motion is replaced
with low friction rolling.
 िेयररिंग का मुख्य उद्देश्य दो तत्वों क
े
िीच सीधे धातु से धातु क
े सिंपक
ा को
रोकना है जो सापेक्ष गतत में हैं। यह
घर्ाण, गमी पैदा करने और अिंततः, भागों
क
े टूट-फ
ू ट को रोकता है। यह ऊजाा की
खपत को भी कम करता है क्योंकक
स्िाइड िंग गतत को कम घर्ाण रोलििंग क
े
सार् िदि हदया जाता है।

4. Types of bearing
 sliding surface or "plain" bearings  rolling element or "anti-friction"
bearings,

5. Types of bearing
 Sliding surface or "plain" bearings a plain surface bearing is a simplest
type of bearing it have only sliding surface. Plain bearings, in general, are
the least expensive type of bearing. They are also compact and lightweight,
and they have a high load-carrying capacity
•Rolling element or "anti-friction" bearings,
•In the anti frication bearing provide moving elements for the low friction
support surface for rotating or sliding surface. This type bearing
commonly made from with hardened rolling elements (balls and rollers) and
races.

6. Sliding surface or "plain" bearings
• Solid Bearing -
• Bush Bearing
• Self-Aligning Bush Bearing
• Pedestal Bearing
• Foot Bearing
• Fluid Bearing


7. Solid Bearing-
the simplest type of bearing, comprising just a
bearing surface and no rolling elements.

8. Bush Bearing-
Bushing, is a mechanical element used to reduce friction between
rotating shafts and stationary support members. Typically, a bushing
relies on soft metal or plastic and an oil film to support the rotating
shaft on the hardened shaft journal.

9. Self-alignment bush bearing – This type bearing alignment
not required. This feature endows them with the self-
aligning properties and permits them to work properly
even with a slight misalignment of shaft relative to the
housing.

10. Pedestal bearing- are widely used for providing support for a
rotating shaft with the help of compatible bearings and various
accessories. It is also known as pillow block (or) Plummer block. It
is used for long shafts requiring intermediate support

12. Fluid bearings are bearings in which the load is supported by a thin layer of rapidly moving
pressurized liquid or gas between the bearing surfaces.[1] Since there is no contact between the
moving parts, there is no sliding friction, allowing fluid bearings to have lower
friction, wear and vibration than many other types of bearings. Thus, it is possible for some fluid
bearings to have near-zero wear if operated correctly.[1]
They can be broadly classified into two types: fluid dynamic bearings (also known
as hydrodynamic bearings) and hydrostatic bearings. Hydrostatic bearings are externally
pressurized fluid bearings, where the fluid is usually oil, water or air, and is pressurized by a
pump. Hydrodynamic bearings rely on the high speed of the journal (the part of the shaft resting on
the fluid) to pressurize the fluid in a wedge between the faces. Fluid bearings are frequently used in
high load, high speed or high precision applications where ordinary ball bearings would have
shortened life or caused high noise and vibration.

13. Rolling element or "anti-friction" bearings
 Ball Bearing
 Roller Bearing
 Needle bearing
 Thrust bearing
 Taper roller bearing
 Cylindrical roller bearing
 Spherical roller bearing

14. Ball Bearing-
In the ball bearing use the metal ball for the
maintain distance between the two races and
reduce rotational friction and support redial
and axial load.

15. Roller Bearing-
The principal types of roller bearings
are cylindrical, spherical, and tapered. In
general, roller bearings offer higher load capacities
thanball bearings of the same size.

16. Needle bearings are a small cylindrical type of roller
bearings which are used to prevent friction between
moving surfaces which have low rotational speeds.
Needle roller bearings are usually used when space is at a
premium as needle bearings are much more compact than
ball bearings

17. Thrust bearing- is a particular type of rotary bearing. Like other
bearings they permanently rotate between parts, but they are
designed to support a predominantly axial load
•Thrust ball bearings, composed of bearing balls supported in a ring, can
be used in low thrust applications where there is little axial load.
•Cylindrical thrust roller bearings consist of small cylindrical rollers
arranged flat with their axes pointing to the axis of the bearing. They give
very good carrying capacity and are cheap, but tend to wear due to the
differences in radial speed and friction which is higher than with ball
bearings.

18. Tapered roller bearings feature tapered inner and outer ring raceways with
tapered rollers arranged between them, angled so the surface of the
rollers converge at the axis of the bearing.
It is ideal for guides that have to undergo extreme loads. It is also found in
applications where radial loads are important and rotational speeds are high.
Tapered roller bearings are essential in sectors such as agriculture, construction,
mining, engines and propellers.

19. Cylindrical roller bearings-
have a simple structure with their cylindrical rollers in linear
contact with the raceways. They offer high load capacity under
primarily radial loads. Low friction between the rollers and ring
ribs makes these bearings suited for high speed rotation.

20. Spherical roller bearings-
consist of an inner ring with two raceways inclined at an
angle to the bearing axis, an outer ring with a common
spherical raceway, spherical rollers, cages and, in certain
designs, also internal guide rings or center rings. These
bearings can also be sealed.

22. What does Bearing Number says silently
6 3 05 ZZ C3
Type of
Bearing
Bearing
Series Inner Dia
Sealing Clearance

23. Bearing Size Data

24. Bearing ID parameter

26. Bearing type
Bearin
g
series
code
Type code Bearing type
Bearin
g series
code
Type code
Single-row deep
groove ball
bearing
67 6 Double-row deep groove
ball bearing
(with filling slot)
42 4
68 6 43 4
69 6
Single-row angular contact
ball bearing
79 7
1602） 6 70 7
60 6 72 7
62 6 73 7
63 6 74 7
64 6 Double-row angular contact
ball bearing
52 5
Double-row
angular contact
ball bearing
(with filling slot)
32 （0） 53 5
33 （0）
Single-row needle roller
bearing
NA 48 NA
Double-row
cylindrical roller
bearing
NNU
49
NNU NA 49 NA
NN 30 NN NA 59 NA

27. Self-aligning
ball bearing
12 1
Single-row
cylindrical
roller bearing
NU 10 NU4）
22 2 NU 2 NU4）
13 1 NU 22 NU4）
23 2 NU 32 NU4）
1122） 1 NU 3 NU4）
1132） 1 NU 23 NU4）
Double-row
cylindrical
roller bearing
NNU 49 NNU NU 4 NU4）
NN 30 NN Single
direction
thrust ball
bearing with
spherical back
face
532 5
Single-row
needle roller
bearing
NA 48 NA 533 5
NA 49 NA 534 5
NA 59 NA
Double
direction
thrust ball
bearing
522 5
Double-row
needle roller
bearing
NA 69 NA 523 5
524 5

28. Tapered roller
bearing
329 3
Spherical roller
bearing
239 2
320 3 230 2
330 3 240 2
331 3 231 2
302 3 241 2
322 3 222 2
332 3 232 2
303 3 2132） 2
313 3 223 2
323 3
Single direction
thrust ball
bearing
511 5
Spherical
thrust roller
bearing
292 2 512 5
293 2 513 5
294 2 514 5

29. Thank you