ppt on journal bearing by ajay sharma

ppt on journal bearing by ajay sharma

• 1.
  GOVT. ENGINEERING COLLEGE, BIKANER JOURNALBEARING Submitted By: Govind Ajay Sharma Submitted To: Dr. Pankaj Gupta Sir TOPIC : To plot pressure distribution curves on journal bearing
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  INTRODUCTION A bearing isa 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.
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  JOURNAL BEARING  Itis simply a block of cast iron with a hole for the shaft providing running fit.  Oil hole is drilled at the top for lubrication.
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  JOURNAL BEARING:: Usedto 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.
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  FIG: Cross- sectional view ofjournal bearing
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  TYPES OF JOURNALBEARING There are basically 3 types of journal bearing : 1.Dry 2.Hydrodynamic 3.Hydrostatic fig: dry journal bearing
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  Hydrodynamic journal bearing Hydrostatic journal bearing
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  DISADVANTAGES OF JOURNAL BEARING Thereis 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
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  PRESSURE DISTRIBUTION  Apressure 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.
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  Eccentricity ratio Ratio of eccentricity(e) and radial clearance (c)
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  CONCLUSION WE , studiedabout 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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  THANKS FOR WATCHING MYPRESENTATION , I HOPE YOU LIKED IT,