What is bevel gear and how it work.

A gear is made of toothed wheels  that transmits the mechanical force between the two elements. They are commonly used in a variety of fields such as mining, aerospace, pharmaceutical or textile, as well as the machinery used in numerous industrial processes, such as production lines and drive systems. The purpose for which they are manufactured determines the design of the gears (bevel gears, spur gears, helical gears, etc.) and their materials.

The use of gears is very widespread because it offers many advantages.

•  They do not take large space.
•  They can transmit large amounts of energy.
•  They have high performance.
•  Very basic maintenance is required.
•   They eliminate the possibility of slips.

In this article, we will focus on the what is bevel gear and how it works?? how it is use and also learn how to select the most appropriate bevel gear for the project.

Characteristics of Bevel Gear:-

1 .A bevel gear is a gear that uses two bevel gears to transmit power between axes cut in the same space. However, a hypoid gear can transmit power between two intersecting axes.

2 .The teeth of the bevel gear can be straight or spiral, also known as conical spiral. Different types of gears can be classified according to the width of the tooth, but they can also be classified as tooth width or circular center step.

Types of bevel gears:-  There are several types of bevel gears based on the shape of their teeth.

1. Helical gear:- It is used to combine left and right handed spirals to transmit movement between intersecting axes in the same plane. This reduces the speed of the shaft by an angle of 90 degrees.

They are commonly used in the transmissions of the rear axles of automobiles and are known for their low noise level.

The main difference compared to straight gears is that the edges of the teeth are not parallel to the axis of rotation, but are inclined.

2. Hypiod Gear:- Although it can be considered a less general and helical gear, the main difference is that it consists of a gear with fewer teeth and a greater number of teeth.

It is used when the axis is vertical but not in the same plane.

In addition to being used in industrial machinery, these are commonly used in the automotive industry and are used to connect axles and drive wheels in vehicles with rear-wheel drive. They use a type of oil that is characterized by high pressure.

3.Straight bevel gear:-   Straight teeth are placed on the beveled surface due to the milled outer surface.

This is useful to confirm the transmission of the movement created between axes of intersection in the same plane at almost the same 90 degree angle.

Even if it is used alone to achieve a reduction in the speed of an axis placed at a right angle, it can operate up to 45 degrees, 60 degrees and 70 degrees. Unlike helical bevel gears, there are few coupling surfaces.

4.Spiral bevel gear:- 

These bevel gears  are very steep and present a variety of characteristics.

As the tooth profile of the pinion is wider than that of the main gear, the teeth are separated from each other.

This allows the teeth of the pinion to engage with the different teeth of the main gear to deliver a very high torque without wear.

Where we use the bevel gear??

1.Straight bevel gears:- Straight bevel gears are still used in many applications in watches, training of dentists, manual drills and vending machines. In comparison with other types of gears, it is somewhat incomplete, but it is partially unusable due to the noise generated during the operation.

They are also still used in certain sectors, such as food packaging and canning, lawn and garden equipment, machinery such as drills and sawmills, handling of common materials in the chemical and compression industries of the oil and gas markets. Flow control valve.

2.Spiral bevel gears:- These teeth have deformed teeth. The bevel gears are used in situations where it is important to reverse the direction of rotation of the shaft.

The spiral bevel gears are twisted to provide a smoother coupling and greater tooth contact compared to straight bevel gears.

This reduces the vibration and noise normally experienced when gears, such as straight bevel gears, move at high speeds.

The spiral bevel gears provide a high level of control over how the teeth mesh with each other and allow a specific mounting deflection without overloading the load on both ends of the tooth.

It can be used at high speed and is generally used for motorcycle and bicycle equipment.

3.Hypoid gears:-

Hypoid gears are used in most cases when the speed exceeds 1,000 revolutions per minute.

However, it is useful for low speed applications that require very smooth movement or automatic operation.

For gearboxes of various speeds, the hypoid gears are often used in the output stage and require a high and low torque.

The most common application of the hypoid gearbox is in the rear axle, particularly in the automotive industry used in heavy trucks.

Its angles, the right spiral of the main gear and the left spiral of the pinion, allow the movement of "below the center". This places the transmission shaft in the lower part, is not affected by the lower central gravity and does not affect much to the passenger compartment.

Real applications of bevel gears:-

 The bevel gears are used in the field of mining (excavators, stackers and buckets, dredges, mill actuators, conveyor belts, etc.) in the aerospace sector (steel and special processes of straight and spiral high speed spiral gears, air preheater, etc.)

Forklift trucks, cooling towers, boat actuators and propellers, high-speed offset printing, pharmaceutical packaging machinery, production of polyethylene sheets, and automobile and railroad transmissions are common.

The angled bevel gears in robotics are used in small spaces and in iron metallurgy they are used in vertical supports for mills.

With respect to food processing, bevel gears play an important role in food packaging and processing and in manufacturing equipment.