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GEARS

GEARS. Importance. Modern Multi Speed Bicycles. Automobiles. Construction Equipment. What is a Gear?. A gear is a toothed wheel. Gear Terminology. Gear - A toothed wheel Drive Gear - The gear which produces the input Driven Gear - The gear which produces the output

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GEARS

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  1. GEARS

  2. Importance • Modern Multi Speed Bicycles • Automobiles • Construction Equipment

  3. What is a Gear? • A gear is a toothed wheel

  4. Gear Terminology Gear - A toothed wheel Drive Gear- The gear which produces the input Driven Gear- The gear which produces the output Chain Drive- Combines the sprocket and chain that mesh together to produce a positive mechanical force Gear Ratio - The description of the mechanical advantage obtained through the use of rotating devices Mechanical Advantage - An output increase determined by comparing the input revolutions per minute (RPM) to the output revolutions per minute (RPM)

  5. Gear Terminology Pulley - A wheel used to transmit power by means of a band, belt, cord, or rope Torque - The turning effort that causes something to rotate. If torque produces rotation, then work is done Wheel - A lever that is rotated 360 degrees around an axle Work - The ability of force to travel through a distance Gear Train - A series of two or more meshed gears used to increase or decrease the RPM, torque, or direction of rotation of the output gear.

  6. Gear Terminology Compound Gear Train Simple Gear Train Worm Gear Miter Gear

  7. Purpose of a Gear • Energy Transmission • In the proper combination can be used to increase or decrease speed and torque

  8. Gear Rotations With two gears, the output of the driven gear will rotate in the opposite direction of the drive gear With more than two gears, every other gear will rotate in the same direction (ie. Gears 1, 3, 5 will rotate clockwise and gears 2, 4 will rotate counter clockwise)

  9. Spur Gear

  10. Worm Gear Drive

  11. Bevel Gears

  12. Crossed Helical Gear

  13. Harmonic Gear

  14. Planetary Gear Train

  15. Car Differential

  16. Determining Gear Rpm Driving Gear Teeth Driven Gear Teeth X Driving Gear RPM = RPM of Driven gear

  17. What Is Torque? • The turning effort (measured in inch-pounds or foot-pounds) that causes something to rotate. When torque produces rotation, then work is done.

  18. Determining Torque Power Out = Power In 1HP at 100 rpm=1/2 HP at 200 rpm 1 HP at 200 rpm = 2 HP at 100 rpm

  19. Also Recreation (fishing) Timing Gears Efficient Transportation (sprocket system)

  20. Car 3 Speed Transmission

  21. Gear Review • What is a gear? • Name 4 different types of gears. • What is torque and rpm? • What is diametral pitch & how is it shown? • List 10 places where gears are used.

  22. Gear Facts • The rpm of the larger gear is always slower than the rpm of the smaller gear. • Mating gears always turn in the opposite direction. • Gears locked together on the same shaft will always turn in the same direction and at the same rpm. • Mating gears always have the same size teeth (diametral pitch). • The gear ratio between mating gears is the ratio between the number of teeth, the pitch diameters and the rpms.

  23. Gear Trainer

  24. Car Differential

  25. Spur Gear Terminology Involute Profile

  26. Spur Gear - Tooth Parts

  27. Gear Tooth Size Called Diametral Pitch

  28. Identify parts of the gear trainer Identify gears Identify gear terminology Identify tooth terminology Identify gear purpose Determine RPM Determine torque Presentation Objectives

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