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Antifriction bearings
1. SPM POLYTECHNIC KUMTHE ,
SOLAPUR
Antifriction
Bearings
SEMINAR ON
Sachin B. Salgar
Roll no :- 1240
2.
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
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