Spur gears are the most typical type of gears. They have straight teeth, and so are installed on parallel shafts. Sometimes, many spur gears are utilized at once to create very large gear reductions.
Spur gears are found in many devices that you can see around HowStuffWorks, like the electric screwdriver, dance monster, oscillating sprinkler, Taper Lock Pulley windup alarm clock, washing machine and clothes dryer. Nevertheless, you won’t find many in your vehicle.
This is because the spur gear could be really loud. Whenever a gear tooth engages a tooth on the additional gear, the teeth collide, which impact makes a sound. It also increases the stress on the gear teeth.
To lessen the noise and stress in the gears, the majority of the gears in your car are helical.