Gears are found in tons of mechanical gadgets. They do several important jobs, but most significant, they offer a gear reduction in motorized equipment. This is key because, frequently, a small motor spinning extremely fast can provide plenty of power for a device, but not enough torque. For instance, an electric screwdriver includes a large gear reduction since it needs plenty of torque to carefully turn screws, bu­t the motor only produces a little amount of torque at a higher speed. With a gear reduction, the output speed could be reduced while the torque is increased.

One more thing gears do is usually change the direction of rotation. For example, in the differential between your rear wheels of your car, the energy is usually transmitted by a shaft that runs down the guts of the automobile, and the differential has to change that power 90 degrees to apply it to the wheels.

There are a lot of intricacies in the various types of gears. In this post, we’ll learn exactly how the teeth on gears work, and we’ll talk about the different type­s of gears you discover in all types of mechanical gadgets.­


On any gear, the ratio depends upon the distances from the guts of the apparatus to the point of contact. For instance, in a device with two gears, if one gear is twice the size of the various other, the ratio will be 2:1.

One of the most primitive types of gears we could look at would be a steering wheel with wooden pegs sticking out of it.

The problem with this type of gear is that the distance from the center of each gear to the point of contact changes as the gears rotate. This means that the gear ratio adjustments as the apparatus turns, meaning that the output acceleration also changes. If you used a gear such as this in your car, it might be impossible to keep a constant speed — you’d be accelerating and decelerating constantly.

Many modern gears use a special tooth profile named an involute. This profile gets the very important house of maintaining a continuous speed ratio between your two gears. Just like the peg steering wheel above, the contact point moves; but the shape of the involute equipment tooth compensates Super Power Lock because of this movement. Find this section for details.

Now let’s take a look at some of the various types of gears.


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