Forging new generations of engineers. GEARS Presentation Objectives Identify parts of the gear...

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Forging new generations of engineers

Transcript of Forging new generations of engineers. GEARS Presentation Objectives Identify parts of the gear...

Page 1: Forging new generations of engineers. GEARS Presentation Objectives Identify parts of the gear trainer Identify gears Identify gear terminology Identify.

Forging new generations of engineers

Page 2: Forging new generations of engineers. GEARS Presentation Objectives Identify parts of the gear trainer Identify gears Identify gear terminology Identify.

GEARS

Page 3: Forging new generations of engineers. GEARS Presentation Objectives Identify parts of the gear trainer Identify gears Identify gear terminology Identify.

Presentation Objectives

• Identify parts of the gear trainer

• Identify gears• Identify gear terminology• Identify tooth terminology• Identify gear purpose• Determine RPM• Determine torque

Page 4: Forging new generations of engineers. GEARS Presentation Objectives Identify parts of the gear trainer Identify gears Identify gear terminology Identify.

Gear Trainer

Page 5: Forging new generations of engineers. GEARS Presentation Objectives Identify parts of the gear trainer Identify gears Identify gear terminology Identify.

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

Page 6: Forging new generations of engineers. GEARS Presentation Objectives Identify parts of the gear trainer Identify gears Identify gear terminology Identify.

Spur Gear

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Worm Gear Drive

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Bevel Gears

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Crossed Helical Gear

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Harmonic Gear

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Planetary Gear Train

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Car Differential

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Car Differential

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Gear TerminologyGear - 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.

Page 16: Forging new generations of engineers. GEARS Presentation Objectives Identify parts of the gear trainer Identify gears Identify gear terminology Identify.

Gear Terminology

Page 17: Forging new generations of engineers. GEARS Presentation Objectives Identify parts of the gear trainer Identify gears Identify gear terminology Identify.

Spur Gear Terminology

Involute Profile

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Spur Gear - Tooth Parts

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Gear Tooth Size Called Diametral Pitch

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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 TeethX Driving Gear RPM = RPM of Driven gear

Page 23: Forging new generations of engineers. GEARS Presentation Objectives Identify parts of the gear trainer Identify gears Identify gear terminology Identify.

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

Timing Gears

Recreation (fishing)

Efficient Transportation (sprocket system)

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Car 3 Speed Transmission

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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.