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| Know Your Car : Gears & Gear Types |
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Spur gears are the most common type of gears. They have straight teeth, and are mounted on parallel shafts. Sometimes, many spur gears are used at once to create very large gear reductions.
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Spur gears are used in many devices like the electric screwdrivers, oscillating sprinklers, windup alarm clocks, washing machines, clothes dryers etc. But they are rarely used in automobiles.
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This is because the spur gear can be really loud. Each time a gear tooth engages a tooth on the other gear, the teeth collide, and this impact makes a noise. It also increases the stress on the gear teeth.
To reduce the noise and stress in the gears, most of the gears used in cars are helical.
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