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Gears

Gears. Gears. Used to transfer energy from one place to another Rotary motion and force transferred from one part of a machine to another part Gear Wheel: a wheel with matching teeth around its edge Gear Train: two or more gear wheels that mesh

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Gears

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  1. Gears

  2. Gears • Used to transfer energy from one place to another • Rotary motion and force transferred from one part of a machine to another part • Gear Wheel: a wheel with matching teeth around its edge • Gear Train: two or more gear wheels that mesh • rotary motion from one gear is transferred to another gear

  3. Driving Gear (Driver): supplies the driving force in a gear train • Driven Gear (Follower): The gear wheel that the driving gear applies it’s force to • Mesh: gears must mesh, or interlock neatly as they rotate

  4. Gears Can Increase Rotational Speed • A gear train can increase the rotational speed of a device • Ex. a hand mixer, bike • The driving gear is larger (has more teeth) than the driven gear so the driven gear travels faster Driving gear Driven gear

  5. Gears Can Decrease Rotational Speed • Reducing gears are drive trains that decrease the rotational speed of a device so they decrease speed • Ex. bicycle, car Driving gear Driven gear

  6. Gears can Change Direction • Parallel gears are the same size, so they have the same rotation speed, but they change the direction of the rotary motion • Drive wheel: clockwise; Driven wheel: counterclockwise • Ex car transmission

  7. Gears can change rotary motion into straight line motion Load

  8. Gears can transfer a rotary motion from one shaft to another without changing direction

  9. Mechanical Advantages of Gear Trains • To calculate the increase or reduction in rotational speed calculate the ratio of the size of the driving gear to the size of the driven gear • This is called the speed ratio

  10. Multiplying Gears Driving gear = 10 teeth = 2 Driven gear = 5 teeth The speed of the gear has been changed by a factor of 2, the driven gear will move twice as fast as the driving gear 5 teeth 10 teeth

  11. Reducing gears Driving gear = 4 teeth = 1/2 Driven gear = 8 teeth The speed of the gear has been reduced to ½ it’s original speed 8 teeth 4 teeth

  12. Sprockets • Sometimes gears are connected with a chain called a sprocket • Used to gain a multiplying effect, reduce effort or a parallel effect • The gears both rotate in the same direction • In a 10-speed bike there are 5 gears on the rear wheel and 2 gears on the pedal crank

  13. Wheel and Pinion • A gear train that has 2 different sized gears • Larger gear is called a wheel • Smaller gear is called the pinion • Ex. a push lawn mover: the wheels transfer power to the blades (the pinion) which move faster than the wheels

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