Engineering H191

Lab 6 P. 1

Engineering H191 - Drafting / CAD

Autumn Quarter Gateway Engineering Education Coalition

Gears

Lab 6

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Gear: Definition

• A gear is a wheel with teeth along its rim. • It is used to transmit effort from one shaft to

another.

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Gear Train

• Combination of two or more meshed gears. Used to change the rate of rotation, the direction of rotation, and the amount of torque.

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Gear Ratio

• Gear ratio is also called “Mechanical Advantage”

Gear ratio Number of Driver Teeth

Number of Driven Teeth

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Types of Gears• Spur gears

• Worm gear

• Rack and pinion

• Bevel gears

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Spur Gears

• Simplest• Most widely used in Instrumentation and Control

Systems• Used to drive parallel shafts

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Spur Gear Terminology

• Pitch circle diameters• Size of teeth (Diametral pitch)• Center distance• Number of teeth• Pinion• Gear

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Worm Gears

• Used to change speed and direction of rotation. • Used for connecting skew shafts (usually 90

degrees)• High gear ratios.• Higher load capacity.

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Rack and Pinion

• Used to convert rotational motion into linear motion, or vice-versa.

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Bevel Gears

• Used for intersecting shafts.• Most transmissions occur at right angles but

shaft angles can be any value.

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Sprockets

• Gears are connected by a chain instead of directly.

• The input and output shaft rotations are in the same direction.

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Today’s Lab:

• Window Lift Motor• Lego Robot Gripper• Gears at Table• Build Gearbox• Bicycle Gears

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Questions ?

Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 6P. 1Autumn Quarter Gears Lab 6.

Documents

autumn quarter gears

autumn quarter todays

autumn quarter worm

autumn quarter bevel

autumn quarter sprockets

autumn quarter rack

autumn quarter questions