Select Page

Gears are found in tons of mechanical devices. They do several important jobs, but most significant, they offer a gear decrease in motorized equipment. This is key because, often, a small motor spinning very fast can provide plenty of power for a device, however, not enough torque. For instance, an electric screwdriver includes a large gear reduction since it needs lots of torque to turn screws, bu­t the engine only produces a small quantity of torque at a higher speed. With a equipment reduction, the result speed can be reduced while the torque is increased.

One more thing gears do is adjust the direction of rotation. For example, in the differential between your rear wheels of your car, the power is transmitted by a shaft that operates down the center of the automobile, and the differential must change that power 90 degrees to use it to the wheels.

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


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

Probably the most primitive types of gears we’re able to look at would be a steering wheel with wooden pegs protruding of it.

The problem with this type of gear is that the length from the center of each gear to the idea of contact changes as the gears rotate. This implies that the gear ratio adjustments as the apparatus turns, meaning that the output velocity also changes. If you used a equipment like this in your car, it would be impossible to keep up a continuous speed — you’d be accelerating and decelerating continuously.

Many contemporary gears use a special tooth puleggia di distribuzione profile called an involute. This account has the very important home of maintaining a continuous speed ratio between the two gears. Just like the peg steering wheel above, the contact stage moves; but the shape of the involute equipment tooth compensates for this movement. See this section for information.

Now let’s have a look at some of the different types of gears.