Types of Gears


Gear generally refers to a special kind of machine element. In gear, the teeth are generally cut in a cone or cylindrical shape. These elements further help gear to transmit force and rotation from the driving shaft to the driven shaft. The profile of the gear tooth is the fundamental design of gear. Gears are mainly used in increasing force and speed. Gear holds very significant value in daily life.

What is gear?

Gear is very important machinery that is used in increasing speed as well as rotation. Teeth are one of the important elements presented in gears.


Figure 1: Gear

In simple words, gear is machinery components that consist of a toothed wheel and the toothed wheel is attached to the rotating shaft.

Components of Gear

There are different parts of the gear that help it move fast. The significant parts of gear are mentioned below-

  • Axis: Shaft passes through the axis portion of gear.

  • Pitch Circle: This particular circle generally defines the shape of a gear. The Pitch circle of the two transmitting gear should be tangible because through this they easily intermesh.

Parts of a Gear

Figure 2: Parts of a Gear

  • Teeth: Teeth are used for the transmission of the rotation. The gear must possess an integer number of teeth

  • Diametral Pitch: It indicates the ratio of number of teeth to pitch diameter. The same diametral pitch needs to be presented in every gear.

  • Module: The circular pitch that is split by pi is generally known as module. The module is a rotational number and thus it is easier to manage than circular pitch.

  • Circular Pitch: The circular pitch commonly measures the particular distance from one point on the one tooth to the same point on the adjacent tooth.

  • Pressure Angle: Pressure angle generally refers to the pacific ankle between tooth face and gear wheel tangent.

Gear: Types

There are multiple uses of gear that are usually used to conduct various activities in daily life. Gears generally operates in pair.

  • Spur Gear: Sour gear generally transfers the power by shafts by maintaining a parallel way. Spur gear helps the gear to generate radical rotation loads on shaft but it does not produce loads. Spur gear generally produces more noise than helical gears. As opined by Tiano et al. (2019), these types of gears are mainly used to transfer control speed, torque, power, and mechanical motion.

  • Worm Gear: These gears transfer the power and it is mainly used to increase the torque and to reduce the speed. As opined by Liu et al. (2019), these gears include the quiet and smoothest gear system. Worm gears are used as tuning mechanisms for several musical instruments like guitars, mandolins, double basses, many banjos, and bouzoukis.

  • Helical Gear: Helical gear possesses the teeth which are placed at a certain angle to shaft. During the operation of the helical gear, many teeth connect with each other Helical gear can transfer more loads than Spur gear. It is mainly used for the automobile transmissions.

  • Herringbone Gear: Herringbone gear is mainly used to transmit power between the parallel shafts. Herringbone gear possesses a useful cutting process that typically involves milling, hobbing, and shaping. This gear is important as it is applied to prevent the disadvantages of transferring power between the parallel shaft.

  • Bevel Gear: Bavel gears are used in various daily activities such as in printing press, automobiles, marine applications, and power plants. Bevel gear is used as an important mechanism for hand drills.

  • Hypoid Gear: ‘Hypoid gear resembles spiral bevel gear. But they consist of a few differences. This type of gear is commonly used in the industrial field. They are used as medium to small conveyors, crushers, and small mixtures.

Gear: Working principle

Principle of the mechanical advantage is used in gears. Mechanical advantage of gears is provided by gear ratio. As opined by Shuai, et al. (2019), this gear ratio to output force to the input force within a system. Gears are generally operated by spinning, and during the spinning of the wheels, the teeth of it connects with each other Thus particular thing possesses speed and rotation to the machines. The rotation and speed are two essential factors to the gears. The particular relationship of gear trains depends on a certain law which is conservation of energy. In the analyzing of gear trains this particular concept is very necessary which needed to be understood (Trobentar et al. 2020). The several categories of gears perform to accomplish the various activities in many fields. The daily use of gears cannot be avoided.


Gears are very important machinery elements that are used in various fields of regular activities. There are many uses of gears that can be found everywhere. Various transports and industrial mechanisms are run by gears. The speed, as well as the rotation of gear, is dependent on number of teeth, angular velocities, and radius of gear. Thus, it is crucial to have a better understanding of the working principle and the application of the gears.


Q1. What is the main purpose of gears?

Ans. Increasing force and increasing speed arte two prominent propose of gears. Gears are the essential mechanical element that involves various effective uses in regular activities.

Q2. What is the use of gear train?

Ans. Gear trains are applied for the transformation of energy. It transmits the energy from the one part to the other part.

Q3. What of the utilization of gears?

Ans. Gears are ordinarily used for the changing of direction of the rotational motion. Reverse direction can be achieved through Spur gears. Sometimes gears are used for the direct movement in a machine.

Q4. What are the applications of gears in practical life?

Ans. Gears are exclusively used for vehicles, bicycles, drills, and ordinary clocks. Gears are very necessary to do various activities.


Simply Easy Learning

Updated on: 22-Aug-2023


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