The document discusses different types of bearings used in machines and their functions. It describes sliding contact bearings like hydrodynamic and hydrostatic bearings, and rolling contact bearings like ball and roller bearings. The key types of rolling contact bearings are explained as journal/sleeve bearings, thrust bearings, and guide bearings based on the direction of load and motion. Common applications of rolling contact bearings and their advantages are also summarized.

1. SPM POLYTECHNIC KUMTHE ,
SOLAPUR
Antifriction
Bearings
SEMINAR ON
Sachin B. Salgar
Roll no :- 1240

3. FUNCTIONS OF BEARINGS
The bearing supports the shaft as the axle and
holds it in correct position with respect to frame
or casing
The bearing ensure free rotation of the shaft or
axle with minimum friction.
The bearing takes up the forces acting on the
shaft or the axle and transmits to the frame or
casing.

4.  Sliding contact bearing
Hydrodynamic bearing
Hydrostatic bearing
 Rolling contact bearing.
Ball bearing
Roller bearing
classification of bearings
According to nature of relative motion between two
contacting surface

5. Load supporting
high pressure fluid
film is created due to
the shape and
relative motion
between the two
surfaces

6.  The load supporting
fluid film is created
by an external source,
like pump.

7. GUIDE BEARING
The relative
sliding motion
between the two
parts is linear
Eg.. Guide ways
of lathe machine

8. JOURNAL (SLEEVE) BEARING
If the relative sliding
motion between the two
parts is of rotation and
the pressure on the
bearing is
perpendicular to the
axis of the shaft, then
the bearing is known as
journal or sleeve
bearing.

9. THRUST BEARING
If the relative
sliding motion
between the two
parts is of rotation
and the pressure
on the bearing is
parallel to the axis
of the shaft, then
the bearing is
known as thrust
bearing

10. In ball bearing spherical
balls are used as a rolling
element.
The contact between the
inner race and the ball or the
outer race is a point contact.
So it is higher pair.

11. The roller bearings
use the cylindrical
rollers, taper
rollers, or spherical
rollers as the rolling
elements.
The contact
between the two
race is line contact.

12. APPLICATIONS OF ROLLING CONTACT BEARING
o Industrial and automotive gear boxes and at
different automobile.
o Electric motors.
o Machine tool spindle.
o Small size centrifugal pumps.
o Automobile front and rear axles.

13. ADVANTAGES
 Ability to resist the shock load.
 Easy for mounting.
 Low starting and running friction except high
speed
 More accuracy in shaft alignment.
 Compact required less space.
 Low maintenance cost because no lubrication
required during operation.

14. Bearings are necessary while
transferring the motion from one
shaft to another for avoiding the
friction and reducing the losses due to
friction.
For heavy axial load with high
rotational speed rolling contact
bearings are suitable.

15. REFRENCE
 http/google.com/Hydrodynamic Bearing
Construction, Working and Advantages of
Hydrodynamic Bearings.htm
 http/google.com/Bearing (mechanical) -
Wikipedia, the free encyclopedia.htm
 Design of machine element- S.D.Ambatkar
 Machine design –R.S.Khurmi, J.K. Gupta