Crankshaft and Oil Film Journal Bearings

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Crankshaft and Oil Film Journal Bearings

• Dan DeVries

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Objective

• Purpose of Crankshaft
• Parts of Crankshaft
• How its Made
• Journal Bearings

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Purpose of Crankshaft

• linear motion ? rotational motion
• Pistons back-forth movement is changed to
  rotational motion by the crankshaft

http//www.grc.nasa.gov/WWW/K-12/airplane/Images/p
owert.gif
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Parts of a Crankshaft

• Main bearings
• Connecting rod bearings
• Counterweight
• Throws
• Main axle
• Flywheel

http//www.sweethaven02.com/MechTech/Auto02/fig012
8.gif
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Parts of a Crankshaft

• Throws

http//www.mustangandfords.com/howto/29178/
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How its Made

• Machined
• Strong, expensive
• Forged
• Strong, expensive
• Cast
• Weaker, cheaper

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How its Made

• Dimensions critical
• Maintain balance
• Reduce wear at high RPM

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Oil Film Journal Bearings

• Main bearings
• Connecting Rod Bearings

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Sources

• http//www.tribology-abc.com/abc/engine.htm
• http//www.grc.nasa.gov/WWW/K-12/airplane/powert.h
  tml
• http//www.machinerylubrication.com/article_detail
  .asp?articleid779
• Wikipedia (www.wikipedia.org)
• http//www.mustangandfords.com/howto/29178/

http//www.cs.berkeley.edu/sequin/CS285/TEXT/mode
lex.htm
http//www.inparticular.com/products_lamps.htm