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# Forging new generations of engineers - PowerPoint PPT Presentation

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 Transcript

### GEARS

Identify gears

Identify gear terminology

Identify tooth terminology

Identify gear purpose

Determine RPM

Determine torque

Presentation Objectives

### Gear Trainer

• A gear is a toothed wheel

### Car Differential

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)

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.

Compound Gear Train

Simple Gear Train

Worm Gear

Miter Gear

Involute Profile

• Energy Transmission

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

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)

Driving Gear Teeth

Driven Gear Teeth

X Driving Gear RPM = RPM of Driven gear

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

Power Out = Power In

1HP at 100 rpm=1/2 HP at 200 rpm

1 HP at 200 rpm = 2 HP at 100 rpm

• Modern Multi Speed Bicycles

• Automobiles

• Construction Equipment

Recreation (fishing)

Timing Gears

Efficient Transportation (sprocket system)

### Car 3 Speed Transmission

• 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.

• 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.