Gears

• Gears


  Toothed wheels that mesh together to transfer motion from one part to another
• Where are gears found?

  Cars and bicycles to clocks and can openers
• What does gear trains transmit

  Rotary motion and torque
• Torque


  a force that causes rotation
• Why do different sized gears connect

  To increase or decrease the speed of rotation and torque
• What do drive gears do

  Turn the driven gear
• Why is an idler gear used

  To change the direction of rotation so that the driven gear turns in the same direction as the drive gear
• Gear ratio


  The ratio between the drive gear and the driven gear
• What do the sizes of two gear wheels determine

  How fast the wheel turns
• How do we calculate the gear ratio

  Count the number of teeth on each gear and divide the number of teeth on the driven gear, by the number of teeth on the drive gear
• How do we achieve the maximum speed

  Have a larger drive gear paired with a smaller driven gear
• How are velocity ratios calculated

  By dividing the drive gear by the driven gear