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Types of Gears

Scholasticus K Feb 6, 2019
The development of the gears has a great importance in making many modern machines, and they are a crucial aid for modern mechanical industry. They are highly effective mechanical devices that are used to transmit directional motion.
A gear can be defined as a toothed wheel, which can be engaged into another toothed wheel or gear, in order to transmit energy that facilitates change of speed and direction of motion. It is widely used in mechanical devices.
Its teeth are mainly carved on wheels, cylinders, or cones. Many devices that we use in our day-to-day lives are based on the working principle of a gear. The tooth and wheel are basic working parts of such devices.

Different Types

Internal and External Gears

They are the most simplest form of gears, and are used to control locomotion of a mobile body. Their teeth, which are carved on the body's exterior, are interconnected with another gear.
These exterior gears are used mostly along with a chain, like in a bicycle or motorcycle. More complex combinations of such gears are used to manufacture gearboxes for vehicles.
The design of interior gears is similar to that of an exterior one. The only difference is that the teeth are carved inside the wheel, and they are mostly used for perpendicular transfer of energy. Their teeth, which are used to apply the effort, have a perpendicular or straight projection.

Spur Gears

They are also known as straight-cut gears. Their design is very similar to that of a simple exterior gear. However, they have greater yielding strength than exterior ones, and are shaped like a cylindrical disk.
Another difference between these two types is the radial projection of teeth. The uppermost portion of this device is carved in such a manner, that it is always parallel to the axis of rotation.

Helical Gears

They are an upgraded version of the spur types. Their axis is directed in a slanting direction.
Due to this, the teeth get the appearance of a helix. They were developed to replace spur gears that could not last the stressed out high-speed rotation and resolution.

Bevel Gears

They are essentially made up of cones or conical surfaces, and are they used in the transfer of energy from one angle to another.
They are especially useful for a perpendicular transfer of energy. They are further classified according to the angle, as per which the energy transfer takes place.

Crown Gear

As the name suggests, they are shaped like a crown. Their teeth are pointed in an upward direction, and are perpendicularly carved on the wheel. These types are often considered to be an evolution of bevel gears.
All the gears that are presently used have the same principle of physics, and they form an integral part of the modern mechanisms. All have been modified and re-engineered to form different designs, and to execute different functions.