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GearsGears
Engineering Sciences and TechnologyEngineering Sciences and Technology
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A gear is a wheel with teeth on its outer edge.
The teeth of one gear mesh (or engage) with the teeth of another.
Gears meshing or engaged
GearsGears
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Driver and Driven
Two meshed gears always rotate in opposite directions.
Driver gearDriven gear
Spur Gears
GearsGears
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• Multiple gears can be connected together to form a gear train.
Simple Gear Train
Each shaft carries only one gear wheel.
Intermediate gears are known as Idler Gears.
GearsGears
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DriverCompound
Gear
Driven
If two gear wheels are mounted on a common shaft then it’s a Compound Gear train.
GearsGears
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Generally, the Gear Ratio is
calculated by counting the teeth
of the two gears, and applying
the following formula:
Gear ratio = Number of teeth on driven gear
Number of teeth on driver gear
Gear Ratio GearsGears
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The worm gear is always the drive gear
Worm and wheel
Worm gear and wheel GearsGears
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The rack and pinion gear is used to convert between rotary and linear motion.
Rack and Pinion
Heavy Duty
Car Jack
GearsGears
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Bevel gears are used to transfer drive through an
angle of 90o.
Bevel Gears
Bevel gears
GearsGears
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Important Calculations : Important Calculations :
Work Done = Force x Distance moved in the direction of the force
Power = Total Time Taken
Total Work Done
Efficiency % = Power Output
Power InputX 100