ppt on journal bearing by ajay sharma

GOVT. ENGINEERING COLLEGE,BIKANER

JOURNAL BEARING

Submitted By:

GovindAjay Sharma

Submitted To:

Dr. Pankaj Gupta Sir

TOPIC : To plot pressure distribution curves on journal bearing

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.

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.

JOURNAL BEARING:: Used to support the load on a rotating shaft.OIL INLET ::Used to insert oil /lubricationAs 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.

FIG: Cross-sectional view of journal bearing

TYPES OF JOURNAL BEARING

There are basically 3 types of journal bearing :

1.Dry

2.Hydrodynamic

3.Hydrostaticfig: dry journal bearing

Hydrodynamic journal bearing

Hydrostatic journal bearing

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 BEARINGIt 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

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.

Eccentricity ratio

Ratio of eccentricity (e) and radial clearance (c)

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.

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