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Gears%20

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Helical Gears. Much more quiet and smooth than spur gears due to the angled cut of the teeth ... Helical Gears. Gears. Example 3. Worm Gears. Used when large ... – PowerPoint PPT presentation

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Title: Gears%20


1
Gears Spline Shafts
  • Sharif Ali
  • What are they?
  • What are they used for?

2
GearsA Brief History
  • Began as wood with pegs and used animal fat
    grease as lubrication
  • Used in wind and water wheel machinery and to
    power textile machinery

3
GearsUses
  • Three main uses
  • To change the rate of rotation of a machinery
    shaft
  • To change the direction of the axis of rotation
  • To change between rotary and linear motion

4
GearsExample 1
  • Spur Gears
  • Rate of Rotation
  • Most common type of gear
  • Straight teeth, parallel shafts
  • Can be used to create large gear reductions
  • Used in oscillating sprinkler, wind up alarm
    clock, washing machine and clothes dryer
  • Loud due to teeth collision

5
Spur gears
6
Gears Example 2
  • Helical Gears
  • Much more quiet and smooth than spur gears due to
    the angled cut of the teeth
  • Can be mounted on perpendicular shafts to adjust
    angle of rotation by 90o
  • Used in most car transmissions

7
Helical Gears
8
GearsExample 3
  • Worm Gears
  • Used when large gear reductions are needed
  • Worm can turn gear but gear cannot turn worm
  • Useful in conveyor systems

9
GearsExample 4
  • Rack Pinion Gears
  • Rotation into Linear
  • Used in the steering system on automobiles
  • Also used on same scales

10
Spline Shafts
  • Grooves or tongues are machined along the length
    of the shaft
  • This allows for both the shaft and another
    corresponding shaft or component to rotate
    together

11
References
  • www.bergen.org
  • www.howstuffworks.com
  • www.efunda.com
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