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Title:

Gears

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Gears What is a Gear? A gear is: A wheel that has teeth around its edge that interlock with the teeth of other gears. Usually attached to an axle or shaft How a Gear ... – PowerPoint PPT presentation

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Title: Gears


1
Gears
2
What is a Gear?
  • A gear is
  • A wheel that has teeth around its edge that
    interlock with the teeth of other gears.
  • Usually attached to an axle or shaft

3
How a Gear Works
  • A gear transfers circular motion from one gear to
    another.

4
Two equal-sized gears
  • When 2 interlocking gears have the same number of
    teeth, they turn at the same speed, but in
    opposite directions.

5
Two different-sized gears
  • When 2 gears have different numbers of teeth,
    they turn at different speeds.
  • If a small gear turns a large gear, the small
    gear must turn more than once to cause the large
    gear to complete one turn. So, the large gear
    turns more slowly than the small gear.
  • Gears can be used to change the speed of motion.

6
QUESTION
  • If we turn the large gear, what happens to the
    small gear?
  • - If the large gear is turned, the small gear
  • turns in the opposite direction and at a
  • faster speed.

7
Different Types of Gears
  • Spur Gears
  • The teeth meet on a flat surface
  • They can change the speed and direction of motion
  • Ex. Car transmissions

8
Different Types of Gears
  • Bevel Gears
  • 2 gears connect at an angle
  • They are often cone shaped
  • They can change the speed and direction of
    motion.
  • Ex. Egg Beaters

9
Different Types of Gears
  • Worm Gears
  • An axle or shaft has a screw thread that connects
    with another gear.
  • This system is often used to reduce the speed and
    change the direction of the motion.

10
Different Types of Gears
  • Rack and Pinion Gears
  • A single gear, called a pinion, meets with a
    toothed rack.
  • The rack may slide or stay in one place.
  • The system changes circular motion into a
    straight line.
  • Ex. Railroads
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