Best 9 types of Mechanical Gears

To transfer power or load from one place to another place we use the gear. Mechanical Gears is mostly used in Mechanical applications for transmitting power. Nowadays gear is used in every sector or every application. But in all applications, the same gear is not present. As per need and load capacity gears are different. So I discuss some basics about gear in this article.

Here I discuss all Mechanical Gears. Before discussing Gear first know why gear is needed first?

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What is Power transmission?

The transforming power from one place to another is called power transmission. Also transforming power from one part to another part is called power transmission. We know power is received by running an electric motor and oil steam engine. The power is received by any type of machine and driveshaft.

What is Mechanical Gears?

Mechanical gears is rotating circular machine equipment. It is fitted on the top of the soft shaft. It has cut teeth on its circumference. The cut teeth of gear netting with another toothed part. This process is held to send torque. The gear is used to deliver power from one shaft to another.

Gear teeth profile :

Teeth Shape :

There are two curves are commonly used to create the gear teeth profile. The teeth of the gear are called involute or cycloid. But involuted teeth are used more because it is cheaper and easier to make than cycloid.

Types of Mechanical Gears:

According to the parallel of shafts:

  • Spur gear
  • Helical Gear
  • Rack and pinion gear

According to the Intersecting of shafts:

  • Bevel gear

According to the Non-intersecting and non-parallel of shafts:

  • Worm and worm wheel gears

Spur Gear:

It is a simple type of Mechanical Gear. The spur gear teeth are parallel to the axis of the shafts. The main use of this gear is to send the motion on parallel shafts. The spur gear is always used for simple tasks.

Helical Gear:

Mechanical Gears

On this type of gear, the teeth are not made parallel to the axis of the gear. But the teeth are at a fixed angle. This Mechanical Gear is used to send speeds for high-speed and heavy loads on parallel shafts. The use of this gear causes inconvenience that when the gear is in motion. Due to side pressure, the gear tries to exit. It also pushes the bearings and curses.

Hearing bone Gear:

It is also called double helical gear. On this Mechanical Gears, the teeth are drawn at a certain angle from the axis of the gear. The gear teeth are on either side of the center and from V shape. This gear is used to send speeds for high speed and heavy loads on parallel shafts. This type of gear does not push the bearings in the direction of the gear speed and the shaft to the side. The gears are not even trying to get out.

Rack and Pinion Gear:

The rack is a type of flat bar. Its teeth are made straight and in series. It has meshed to a pinion. Its straight teeth are made like the spur gear. This type of Mechanical Gear can be seen with the milling machines table and the lathe machine bed and carriage.

Bevel Gear:

When the axis of the two shafts intersect each other a bevel gear is used. It is used to send motion on such shafts. According to the function bevel gears are of various types. Such as straight tooth bevel gear and spiral teeth bevel gear.

Mitre Gear:

If power transmission is to be rectified in a straight angle direction we use mitre gear. In this Mechanical Gear, two bevel gears make smooth contact with each other. Mitre gears are a special type of bevel gear. Here the shafts intersect at 90 degrees. The gear ratio is 1:1.

Spiral Bevel Gear:

Mechanical Gears
Image Credit – Д.Ильин: vectorization

When an axis is neither parallel non-intersecting we use spiral bevel gear. Examples of such gears are spiral gears and screw bevel gears. Spiral gear is mostly used for high-volume applications. Spiral Mechanical Gears are also used for high-speed reduction. Spiral gears are mostly used in automotive systems such as differential Mechanical Gears. The screw bevel gear is rarely used because its manufacturing process is very complex. Spiral gears are also used in grass cutting, juice, and a guitar string.

Internal Gear:

Now we understand the internal gear. As its name goes it can be said that its teeth in the internal gears are made on the inside surface. So we call them internal gears. Gears are rotated in the same direction. We usually call the larger wheel the angular ring and the smaller one is called the pinion. When we mount more than one gear on the same shaft and the speed of all those gears is also the same. In that case, we call that system to compute gear.

Worm and worm wheel gears:

A worm is a type of cylindrical rod made of successive bangles in a helical or spiral shape. It meshed with a worm gear. It is often used where two shorts cross. But the speed has to be transmitted. Rotating the worm in it rotates the worm gear. But rotating the worm gear does not rotate the worm. Thus the motion is transmitted to the cross by rotating the worm.

Advantages and Disadvantages of Mechanical Gears:


  • It is a positive drive hence velocity remains constant.
  • Provisions for changing velocity ratios can be made with the help of the gearbox.
  • Its efficiency is very high.
  • We can use it for low speeds.
  • It can send high torque values.
  • It is compact in construction.


  • The gears are not suitable when shafts are distant.
  • At high-speed noise and vibration happen.
  • It requires lubrication.
  • It has no flexibility.


Here I explain all about Mechanical Gears. Here also known why gear is necessary? There are some advantages and disadvantages which are explained in this article. In all applications, we can not use the same gear. As per application speed and load capacity we used Gear. This Mechanical Gears article is useful for you. Please give me your feedback on Mechanical Gears article. You have any queries about bearing please comment me.

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