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Forging new generations of engineers. GEARS. Identify parts of the gear trainer Identify gears Identify gear terminology Identify tooth terminology Identify gear purpose Determine RPM Determine torque. Presentation Objectives. Gear Trainer. What is a Gear?. A gear is a toothed wheel.

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Presentation objectives l.jpg

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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What is a Gear?

  • A gear is a toothed wheel










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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)


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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.


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Gear Terminology

Compound Gear Train

Simple Gear Train

Worm Gear

Miter Gear


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Spur Gear Terminology

Involute Profile




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Purpose of a Gear

  • Energy Transmission

  • In the proper combination can be used to increase or decrease speed and torque


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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)


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Determining Gear Rpm

Driving Gear Teeth

Driven Gear Teeth

X Driving Gear RPM = RPM of Driven gear


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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.


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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


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Importance

  • Modern Multi Speed Bicycles

  • Automobiles

  • Construction Equipment


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Also

Recreation (fishing)

Timing Gears

Efficient Transportation (sprocket system)



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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.


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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.


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