1. GOVT. ENGINEERING COLLEGE,
BIKANER
JOURNAL BEARING
Submitted By:
Govind
Ajay Sharma
Submitted To:
Dr. Pankaj Gupta Sir
TOPIC : To plot pressure distribution curves on journal bearing

2. INTRODUCTION
A bearing is a machine element that constraints relative motion to
only the desired motion.
 Reduces friction between the moving parts.
 Bearings provide support to the rotating shaft .
Bearings are provided with some lubrication to
reduce friction.

3. JOURNAL BEARING
 It is simply a block of cast iron with a
hole for the shaft providing running
fit.
 Oil hole is drilled at the top for
lubrication.

4. JOURNAL BEARING:: Used to support the load on a rotating shaft.
OIL INLET ::Used to insert oil /lubrication
As lubricating oil is feed into the bearing and is dragged by the shaft
into the converging gap , the fluid pressure increases and a
hydrodynamic lift is created.

5. FIG: Cross-
sectional view
of journal
bearing

6. TYPES OF JOURNAL BEARING
There are basically 3 types of journal bearing :
1.Dry
2.Hydrodynamic
3.Hydrostatic
fig: dry journal bearing

7. Hydrodynamic journal
bearing
Hydrostatic journal
bearing

8. DISADVANTAGES OF JOURNAL
BEARING
There is no provision for wear and adjustment on account of wear.
The shaft must be passed into the bearing axially i.e. endwise.
ADVANTAGES OF JOURNAL BEARING
It can handle high loads and velocities (less metal to metal contact due to oil
film ).
Long lasting and durable.
Quiet and smooth running of engine.
Low cost
Suitable only for low temperatures and speed
 Requires large supply of lubrication

9. PRESSURE DISTRIBUTION
 A pressure is built up in clearance space when
the journal or shaft is rotating about an
axis(eccentric to bearing axis) and lubricant is
supplied to the bearing.
 This pressure will resist the motion of the
shaft or journal.
Arise due to flow of viscous fluid in
converging channel.

12. Eccentricity ratio
Ratio of
eccentricity (e)
and radial
clearance (c)

14. CONCLUSION
WE , studied about the bearing ,its
functions. WE further studied about
the journal bearing , its, various types
and also saw the pressure distribution
curve of journal bearing.

15. THANKS
FOR WATCHING MY PRESENTATION ,
I HOPE YOU LIKED IT,