Types of gears
Here we will discuss about types of gears, A gear or cogwheel is a rotating machine part having cut teeth, or cogs. Which mesh with another toothed part in order to transmit torque. In most cases with teeth on the one gear being of identical shape, and often also with that shape on the other gear. Two or more gears working in tandem are called a transmission. It can produce a mechanical advantage through a gear ratio and thus may be considered a simple machine. Geared devices can change the speed, torque, and direction of a power source. The most common situation is for a gear to mesh with another gear. However, a gear can also mesh with a non-rotating toothed part, called a rack. Thereby producing translation instead of rotation.
The gears in a transmission are analogous to the wheels in a crossed belt pulley system. An advantage of gears is that the teeth of a gear prevent slippage.
Gears are used in tons of mechanical devices. They do several important jobs. But most important. They provide a gear reduction in motorized equipment. This is key because, often, a small motor spinning very fast can provide enough power for a device. But not enough torque. For instance, an electric screwdriver has a very large gear reduction . Because it needs lots of torque to turn screws. But the motor only produces a small amount of torque at a high speed. With a gear reduction, the output speed can be reduced while the torque is increased.
When two gears mesh, and one gear is bigger than the other (even though the size of the teeth must match). A mechanical advantage is produced, with the rotational speeds and the torques of the two gears differing in an inverse relationship.
In transmissions which offer multiple gear ratios, such as bicycles, motorcycles, and cars, the term gear, as in first gear. It is refers to a gear ratio rather than an actual physical gear. The term is used to describe similar devices even when the gear ratio is continuous rather than discrete. When the device does not actually contain any gears, as in a continuously variable transmission.
For more detail on Different types of gears, visit our gear section.