2 Gears 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
3 Gears Driver and Driven Spur Gears Driven gear Driver gear Two meshed gears always rotate in opposite directions.Spur GearsDriven gearDriver gear
4 Gears Simple Gear Train Multiple gears can be connected together to form a gear train.Each shaft carries only one gear wheel.Intermediate gears are known as Idler Gears.
5 Gears Compound Gear Train If two gear wheels are mounted on a common shaft then it’s a Compound Gear train.DriverCompound GearDriven
6 Gears Gear Ratio Generally, the Gear Ratio is calculated by counting the teethof the two gears, and applyingthe following formula:Gear ratio = Number of teeth on driven gearNumber of teeth on driver gear
7 Gears Worm gear and wheel The worm gear is always the drive gear Worm and wheelThe worm gear is always the drive gear
8 Gears Rack and Pinion Heavy Duty Car Jack The rack and pinion gear is used to convertbetween rotary andlinear motion.Heavy DutyCar Jack
9 GearsBevel gearsBevel gears are used to transfer drive through an angle of 90o.Bevel Gears
10 Important Calculations : Work Done = Force x Distance moved in the direction of the forceTotal Work DonePower =Total Time TakenEfficiency % =Power OutputPower InputX 100
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