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  • Syed Sagheer Abbas Rizvi

Types of Bevel Gears

There are several different types of bevel gears, each type has a different purpose and is used in different applications. In this article, we will explore the most common types of bevel gears.

What is Bevel Gear?

Bevel gears are mechanical devices with conically shaped tooth-bearing sections and two main shaft axes that are cut across. Bevel gears can be manufactured to function at other angles in addition to being assembled on shafts that are exactly 90 degrees apart from one another. A bevel gear's pitch surface has a cone-like form.

The pitch angle and pitch surface are two fundamental ideas in gearing. The angle between a gear's axis and the pitch surface face is referred to as the gear's pitch angle. A gear's pitch surface is the fictitious toothless surface that would result from analyzing the valleys and peaks of each tooth. A typical gear's pitch surface has a cylinder-like form.

The cone is used to model the most common forms of bevel gears, which have pitch angles of less than 90 degrees. As a result of the gear teeth pointing outward, this type of bevel gear is shown as the exterior form. The top points of the two surfaces are at the point where the shaft axes connect, and the pitch plates of exterior forms with mesh are coaxial with the gear shafts.

There are many types of bevel gears, which can be classified according to the arrangement of their teeth. Among the most frequent types are:

Spiral Bevel Gears:

Spiral bevel gears have a helical shape that allows them to transmit torque at an angle. They are often used in automotive applications because they can create a large output torque with a small input torque.

Crown Bevel Gears:

Crown bevel gears are used when there is a requirement for very high accuracy between the shafts. They are commonly used in aerospace and medical applications where precise movement is essential.

Miter Bevel Gears:

Miter bevel gears are similar to crown bevel gears, but they have a square instead of a circular shape. They are often used in machine tools and other industrial machinery where Accuracy and strength are important factors.

Spur Gears:

Spur gears are the most basic type of bevel gear. They have straight teeth that mesh together perpendicularly. This makes them ideal for use in low-speed applications where torque is not a concern.

Helical Gears:

Helical gears have spiral teeth that mesh together axially. This makes them more efficient than spur gears and allows them to handle higher speeds and torques.

Herringbone Gears:

Herringbone gears are similar to helical gears, but feature two sets of angled teeth that mesh together at an angle. This allows them to achieve even higher efficiencies than helical gears while still handling high speeds and torques.

Straight Bevel Gears:

These gears have straight teeth that mesh together at right angles. They are commonly used in transmissions and rear axles.

Hypoid Bevel Gears:

These gears have asymmetrical tooth profiles, which allow them to be mounted parallel to the axle shafts. They are often used in vehicles with front-wheel drive.

Uses for Bevel Gear Assemblies:

Bevel gear assemblies can be used in a variety of applications, including automotive transmissions, power tools, agricultural equipment, and robotics. By using different combinations of spur, helical, and herringbone gears, you can create gear assemblies that are specific to your needs or requirements.


Bevel gears, as can be seen, come in a variety of designs depending on the geometry of the splines and the gear plane. Except for the design of the teeth or spline, the straight bevel gear resembles the zerol bevel gear. Except for the latter's pitch surface, the hypoid bevel gear and bevel gear are similar. The bevel gear's use and intended purpose within a machine determine how the geometric design must be modified.

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