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Forging new generations of engineers

Forging new generations of engineers. Pulleys, Sprockets, and Gears. Pulleys, Sprockets & Gears. Pulleys, sprockets and gears are mechanisms used to transfer energy through rotary motion. These components can be used to: change the speed of rotation change the direction of rotation

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Forging new generations of engineers

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  1. Forging new generations of engineers

  2. Pulleys, Sprockets, and Gears

  3. Pulleys, Sprockets & Gears Pulleys, sprockets and gears are mechanisms used to transfer energy through rotary motion. These components can be used to: • change the speed of rotation • change the direction of rotation • change the amount of torque available to do work Following is a comparison of the components and the equations used to calculate speed and torque.

  4. Applications Sprockets Pulleys

  5. Pulleys & Sprockets

  6. Pulleys & Sprockets Speed Ratio = Input Rate Output Rate Angular velocity uses the symbol  and has units of revolutions per minute (rpm).  In /  out = D out / D in Torque in = D in Torque out D out Driven (out) D out Driver (in) D in

  7. Gears A gear train is another mechanism for transmitting rotary motion and torque. Gears transmit rotary motion through interlocking teeth. A gear train is made when two or more gears are meshed.

  8. Applications

  9. Gears N = number of teeth Driver (in) Driven (out) Driver (in) Driven (out) Idler Gear

  10. Gear Ratio = Input Rate Output Rate Angular velocity in * N in = Angular Velocity out * N out  in * N in =  out * N out Gear Ratio =  in = N out  out N in or Gear Ratio =  in = D out  out D in and Torque in = D in = N in Torque out D out N out

  11. Example: Find gear ratio and find the input torque required so that the output torque is 100 ft-lb. Driven Driver 24T 36T GR = N out / N in = 36/ 24 = 1.5 T in = T out * N in / N out = 100 * 24 / 36 = 66.7 ft-lb

  12. Driven Driver 12T 24T 36T Example: Find gear ratio and find the input torque required so that the output torque is 100 ft-lb. A B C GR = N B / N A * N C/ N B= N C / N A = 36/ 24 = 1.5 T in = T out * N in / N out = 100 * 24 / 36 = 66.7 ft-lb Gear Ratio is unchanged by the idler gear.

  13. Compound Gear Trains 60T 60T Driven Driver C A D 15T B 15T GR = N B / N A * N D/ N C= 60/ 15 * 60/15 = 16

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