3. BEARING IS A MACHINE PART WHICH IS USEDTO BEAR
THE LOAD AND ALSO REDUCETHE FRICTION.
Bear the
Load.
1 2 3 4
There are four Main purpose of Bearing.
Reduce the
Friction.
Rotate shaft
Easily.
Control Axial and
Radial Movement.
4. THERE ARE MAIN TWO TYPES:
1- Friction Bearing/Plain Bearing
2- Anti-Friction Bearing
5. PLAIN BEARING/FRICTION BEARING:
1. Journal Bearing
a) Half-Sleeve Journal Bearing
b) Full-Sleeve Journal Bearing
2. Bush Type Bearing
3. Liner Type Bearing
4. Tilting Pad type Bearing
5. Thrust Bearing
a) Tilting Pad type thrust Bearing
b) Collar Type Bearing
c) Guide Bearing
In these types of bearing, Minimum direct contact between shaft and
bearing.
There are Following types of friction bearing:
6. 1. JOURNAL
BEARING
• Journal or plain bearings consist of a shaft or
journal which rotates freely in a supporting metal
sleeve or shell. There are no rolling elements in
these bearings.
• Journal bearings operate in the metal-to-metal
contact only during the startup and shutdown of
the equipment when the rotational speed of the
shaft (journal) is insufficient to create an oil film. It
is during startup and shutdown when almost all of
the damage to the bearing occurs.
• Typically, minimum oil film thicknesses in the load
zone during operation ranges from 1.0 to 300
microns, but values of 5 to 75 microns are more
common in midsized industrial equipment. The
film thickness will be greater in equipment which
has a larger diameter shaft.
9. 5. THRUST BEARING
(TILTING PAD TYPE)
• Thrust Bearing is used to control the Axial and Radial
Movement.
• Tilting pad thrust bearings are designed to transfer high
axial loads from rotating shafts with minimum power loss,
while simplifying installation and maintenance.
• The shaft diameters for which the bearings are designed
range from 20 mm to more than 1,000 mm.
• The maximum loads for the various bearing types range
from 0.5 to 500 tons.
• Preferred oil supply pressure for directed lubrication is 1.4
bar (20.3 PSI).
• No seal rings are required on the shaft.
10. 5. THRUST BEARING
(COLLAR TYPE)
• A Collar Bearing is a type of Thrust Bearing. In thrust
bearings, the load acts along the axis of the shaft as in
Turbine shafts.
• The collar bearings usually have a single or a multiple
number of collars depending upon the application.
• The collars present in the bearing tends to arrest the
movement of the shaft in the axial direction.
The above pic shows a Collar
Bearing with 4 collars.
11. 5. THRUST BEARING
(GUIDE TYPE)
• A guide bearing is a roller, plate or block that reduces wear, maintains alignment
and minimizes friction of moving parts. Guide bearings are commonly found on
saws, machining tools and other equipment where alignment of moving parts is
needed. Smaller bearings may use low-drag polymers or plastics, and larger loads
may require the use of metal rollers and lubricants.
• Larger equipment can use linear bearings, but these may be rollers surrounding
the guide shaft. A roller guide bearing can be shaped as a cylinder, with a ring of
guide rollers. Placement of these bearings at each end of a moving shaft can
provide minimal friction while permitting proper linear motion.
12. ANTI-FRICTION BEARING:
1. Line-Contact/Roller Bearing
a) Taper Roller Bearing
b) Spherical Roller Bearing
c) Cylindrical Roller Bearing
d) Thrust Roller Bearing
1. Point-Contact/Ball Bearing
a) Deep Groove Ball Bearing
b) Angular Contact Ball Bearing
c) Double Row/Self aligned Ball
Bearing
d) Thrust Ball Bearing
In these types of bearing, Maximum contact between shaft and
bearing. And Reduce friction by using Rolling Element.
There are Following types of friction bearing:
13. 1. LINE CONTACT/ROLLER BEARING
• Roller Bearings are a type of Anti-Friction bearing that uses cylinders (rollers) to
maintain the separation between the moving parts of the bearing.
• The purpose of a roller bearing is to reduce rotational friction and support radial and
axial loads.
• Compared to ball bearings, roller bearings can support heavy radial loads and limited
axial loads (parallel to the shaft).
• They can operate at moderate to high speeds (although maximum speeds are
typically below the highest speeds of ball bearings).
• The lubrication method must carefully considered during the design phase when
using roller bearings
14. TYPES OF ROLLER BEARING
A. Taper Roller Bearing
B. Spherical Roller Bearing
C. Cylinder Roller Bearing
D. Thrust Roller Bearing
15. A. TAPER ROLLER BEARING
• Tapered roller bearings consist of four basic components including: the cone (inner
ring), the cup (outer ring), tapered rollers, and a cage (roller retainer).
• The cone, cup and rollers carry the load while the cage spaces and retains the rollers
on the cone.
• In addition, Tapered roller bearings may be a single-row, double-row and four-row.
• Tapered roller bearings are used for heavy-duty, moderate speed applications. Typical
applications that will benefit from these durable bearings include:
• Agriculture, Construction and Mining Equipment
• Various Axle Systems
• Conveyance Vehicles
• Gear Box, Engine Motors, Reducers
16. TAPERED ROLLER BEARING MATERIAL
• While other materials may be available, typically,
tapered roller bearings are made of high carbon
chrome steel due to their expected performance.
17. B. SPHERICAL ROLLER BEARING
• Spherical Roller Bearings are designed to work in
applications where severe misalignment exists whether from
mounting or shaft deflection and with relatively heavy radial
loads and some axial loads in either direction.
• They are also extremely resistant to shock loads.
• Spherical Roller Bearings are designed to be more robust by
carry heavier loads but at lower maximum speeds.
• These bearings have barrel-shaped rollers between the inner
ring, which has two raceways, and the outer ring which has
one spherical raceway.
18. C. CYLINDER ROLLER THRUST BEARING
• They are designed to support a high axial load
while doing this (parallel to the shaft). Higher
speed applications require oil lubrication.
• Generally, they are composed of two washers
(raceways) and the cylindrical roller elements
which are typically caged. As opposed to
roller thrust bearings, ball thrust bearings can
generally operate at higher speeds but at
lower loads.
19. 2. POINT-CONTACT/BALL BEARING
• Ball Bearings are a type of Point-contact bearing that uses balls to maintain the
separation between the moving parts of the bearing.
• The purpose of a ball bearing is to reduce rotational friction and support radial
and axial loads.
• Radial Ball bearings can support moderate radial loads and moderate axial loads
(parallel to the shaft).
• They can operate at high speeds (400,000 RPMs and higher).
20. TYPES OF POINT CONTACT/BALL BEARING
1. Deep groove ball bearing
2. Angular contact ball bearing
3. Double Row/Self aligned ball bearing
4. Thrust ball bearing
21. 1. DEEP GROOVE BALL BEARING
• Single row deep groove ball bearings are the most widely
used roller bearing type in the world due to their
versatility and overall performance.
• Their straight forward basic design has many advantages:
• Excellent for high Load and Low RPM.
• Good radial load capacity
• Acceptable axial load capacity in both directions
• Have low torque capacity at startup and running
speeds
• Can operate with low noise.
• Heavy Duties.
22. CONSTRUCTION:
• They are characterized by having
deep raceway grooves in which the
inner and outer rings have circular
arcs of slightly larger radius than
that of the balls.
• These bearings often have steel
shields or rubber seals installed on
one or both sides and are pre-
lubricated with grease. Also, snap
rings are sometimes used on the
outside edge. While many different
retainers are available, pressed steel
cages are most commonly used.
Main Parts:
• Inner Race
• Outer Race
• Cage
• Balls
• Steel shields/Rubber Seal
23. 2. ANGULAR CONTACT BALL BEARING:
• Due to their internal design, angular contact ball
bearings can withstand high radial-axial loads and
reach high speeds.
• Typically, the inner and outer raceways and balls
are made of chrome steel. Where operating
conditions are severe, bearings may have ceramic
balls.
• They may be single or multi-rows.
24. 3. DOUBLE ROW/SELF ALIGNED BALL BEARING:
• Self-Aligning Double Row Ball Bearings are designed to work
in applications where severe misalignment exists whether from
mounting or shaft deflection.
• The concave raceway of the outer ring in combination with
two rows of balls operate over a wide range of contact angles.
• It aligns itself correctly with the shaft and assembly without
causing undue stress on the rest of the bearing assembly.
• Standard Self-Aligning Double Row Ball Bearings are produced
with straight bores; however, tapered bores are available upon
request.
• Self-aligning ball bearing has the lowest friction of all rolling
bearings, which enables it to run cooler even at high
speeds. Furthermore, the design allows for easy mounting and
dismounting.
25. 4. THRUST BALL BEARING
• Composed of ball bearings supported in a ring, can be
used in lower thrust applications where there is little radial
load.
• Raceways may be flat or grooved.
• Thrust ball bearings starting with bores as small as 2 mm
but as large as 340 mm.
• Thrust bearings are used in higher speed applications that
require oil lubrication, such as in the automotive and
aerospace industries.
• Generally, thrust bearings are composed of two raceways in
which those for ball bearings may be grooved, and the
rolling elements.
26. BEARING NUMBER EXPLAINED:
(1) Prefix (2) Basic Number (3) Suffix
(1) Prefix:
K Cage with roller elements
L Removable bearing ring
R Ring with roller set
S Roll body of stainless steel
W Stainless steel deep groove ball bearing
27. (2) Basic Number:
The example at the header shows
a 6001 2RS bearing. So what does
the 6001 actually mean?
Lets attempt to break it down.
(6)001
This first number relates to the
bearing type, as shown in the
table below type 6 is a deep
grooved roller bearing.
1 Self-Aligning Ball Bearing
2 Spherical Roller Bearing
3 Tapered Roller Bearing
4 Deep Groove Double Row Ball Bearing
5 Thrust Ball Bearing
6 Deep Groove Ball Bearing
7 Angular Contact Bearing
8 Cylindrical Thrust Bearing
28. 6(0)01
This second number relates the bearing series,
which reflects the robustness of the bearing.
As you go up the scale below from 9 to 4 the
inner and outer race thickness will usually
increase along with the ball size, this will be to
help cope with extra load.
9 Very thin section
0 Extra light
1 Extra light thrust
2 Light
3 Medium
4 Heavy
60(01)
The 3rd and 4th digits of the bearing number
relate to the bore size of the bearing, numbers
00 to 03 have a designated bore size
depending on the number.
00 10mm
01 12mm
02 15mm
03 17mm
• While numbers over 03 simply have a bore
size which is 5 times that of the 3rd and 4th
digit.
29. (3) SUFFIX:
2 RS
Bearing with rubber seal on both sides. RS provides a better seal but more
rolling friction than 2Z.
RS Bearing with rubber seal on one side, one side open.
2 Z / ZZ Bearing with a metal seal on both sides.
Z Bearing with a metal seal on one side, one side open.
E Reinforced Design
P2 Highest precision
K Bearing with taper bore
