Spur gears are the most typical kind of gears. They have straight teeth, and are mounted on parallel shafts. Sometimes, many spur gears are used at once to Bearing create large gear reductions.
Spur gears are found in many devices that you can see all over HowStuffWorks, like the electric powered screwdriver, dance monster, oscillating sprinkler, windup alarm clock, washing machine and clothes dryer. But you won’t find many in your vehicle.
This is since the spur gear can be really loud. Each time a gear tooth engages a tooth on the other gear, one’s teeth collide, and this impact makes a sound. In addition, it increases the pressure on the gear teeth.
To reduce the noise and tension in the gears, the majority of the gears in your vehicle are helical.