What Is A Planetary Gear Box?

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An instrument with planetary gears has their output shaft and input shaft aligned. The torque density was introduced to describe how planetary gearboxes are used to transmit the most torque in the smallest form.  

Compared to a traditional pinion-and-gear reducer, planetary gearing is always more compact due to its in-line shafting and cylindrical assembly. These are excellent candidates when weight, space, torque, and reduction are the main considerations. In addition to being used in bulldozer powertrains, these sets are also used in electric screwdrivers. More information is needed to fully grasp the functionality of a planetary gearbox. Understanding how planetary gearboxes are built reveals some of their less-obvious properties.  

An acceleration hub on a bicycle is a basic example of planet-wheel wheels. 

Do you ever wonder how so much power and capability can be squeezed into such a small wheel? A planetary gearbox utilizes a single-stand for a three-speed hub and a two-strand for a five-speed hub. There are three types of gear sets on planets: reduction, acceleration, and direct coupling.  

Why Is it called as planetary gearbox? 

Several gears in the planetary gearbox move together as a set of gears. Several planetary gears are observed in a planetary gearbox: one for the satellite (ring), one for the sun (solar), and one or more for the planet. Sun gears in the planet carrier move the Planet gears attached to the output shaft, which form the output shaft when the sun gear is running. With respect to the outside components, the satellite gear is always located in the same place. That is the origin of the term planetary solar arrangement, which looks like our solar system. What helped was that ancient gear structures were employed widely in astrology for mapping and following the celestial bodies.   

What Is the Function of a Planetary Gearbox? 

The planetary gearbox is ideal for servo applications because it combines the benefits of a long performance life with a low maintenance requirement. Planetary gearboxes are more compact than other device forms, so they provide a great deal of torque transmission while also adding stiffness and low noise.  

The planetary gearbox also contains a central gear called “the sun” -also known as the sun gear. Normally, this gear is connected to the input shaft. In addition to the planet, there are also outer gears around the edges. Featuring a ring component that encircles the planet components, the formation as a whole looks like a planet. An output shaft is attached to the carrier that holds the planet gears.  

Planetary gearboxes are relatively simple – they consist of sun gear in the center, an outer ring, a carrier, and planetary gears. A solar-powered gearbox is driven by the input power. There is a standard mesh between the planetary gears and the sun gear, and the planetary gears turn according to their axes as the sun gear rotates.  

The ring and planetary gears are connected, which results in planetary parts rotating around the sun gear. The carrier preserves the basic form of the planetary gears while setting their gaps. Incorporating the output shaft into the carrier, it rotates with the planetary parts. 

Three basic parts make up a planetary gear set:  

  • This gear is situated at the center of the bike (central part) 
  • The ring gear (outer component) 

A planetary gearbox consists of three parts that create a stage. There are double and triple stages available for greater ratios. A planetary gearbox can be powered by hydraulic motors, electric motors, diesel, or petrol engines. 

Various types of planetary gearboxes 

Planetary gearboxes are available in three different types, based on their performance, including wheel drive, shaft output, and spindle output. Below is an explanation of their characteristics.  

Wheel Drive 

A wheel-drive planetary gearbox is connected to the sun gear, which drives the surrounding planetary parts on a carrier. The planet gears rotate the outer ring gear when the sun gear is operated. There is an option to combine the wheels over the housing. It is possible to reduce the size of the system by connecting the wheel directly to the gearbox. Wheel-drive planetary gearboxes are suitable for torques up to 332,000 N.m. 

Spindle Output 

The planetary gearboxes with shaft outputs operate similarly, only the output is a flange rather than a shaft. The spindle drive is suitable for applications requiring torques up to 113,000 N.m. 

Shaft Output 

As a direct result of the sun gear, the planetary parts surround a shaft drive gearbox, which is mounted on a turning carrier. A fixed ring part is attached to the turning carrier that drives the shaft. A turning shaft follows a straight line from the housing to the machine. A shaft output gearbox is capable of delivering up to 113,000 N.m of torque. 

If you need any help around the planetary gearbox, we will help you. Call us or make an inquiry today. 

Worm gearboxes are a crucial component in numerous industrial applications. If you are in the market for a new gearbox, it is important to understand what a worm gearbox is and how it can benefit you. In this blog post, we will provide an overview of worm gearboxes, their components, how they work, the types available, and their advantages.

We will also discuss some common applications of worm gearboxes and why you should choose KG International as your leading provider.

What Is a Worm Gearbox?

It is also known as a worm gear reducer, a gear system used to transmit power between two shafts transmit that are perpendicular to each other. Worm gearboxes are used in many industrial applications, including conveyor systems, packaging machinery, and construction equipment’s. They are designed to be compact, efficient, and low maintenance, making them an ideal solution for many applications.

Components of a Worm Gearbox

They are made up of two main components: the worm gear and the worm wheel. The worm gear is a type of a gear with a screw-like thread that meshes with the teeth of the worm wheel. The worm wheel is a type of gear that is shaped like a ring with teeth on the inside. The worm gear and worm wheel are made of materials such as steel, bronze, or aluminium, depending on the application.

How Does a Worm Gearbox Work?

The worm gear and worm wheel work together to create a gear ratio, which is the ratio between the number of teeth on the worm wheel and the number of threads on the worm gear. When the worm gear rotates, it turns the worm wheel, which in turn rotates the output shaft. The gear ratio of a worm gearbox is typically higher than that of other types of gearboxes,

which makes them ideal for applications where a high reduction ratio is required.

Types of Worm Gearbox

There are two main types of worm gearboxes:

Single Reduction and Double Reduction.

Single reduction: It has one set of gears, while double reduction worm gearboxes have two sets of gears.

Double reduction: They have a higher gear ratio than single reduction worm gearboxes, making them ideal for applications where a higher reduction ratio is required.

Advantages of Worm Gearbox

Worm gearboxes offer many advantages, including:

1. High gear ratios – They can achieve high gear ratios, making them ideal for applications where a high reduction ratio is required.

2. Compact size – They are typically more compact than other types of gearboxes, making them ideal for applications where space is limited.

3. Smooth operation – It is operated smoothly and quietly, making them ideal for applications where noise is a concern.

4. Low maintenance – It requires less maintenance than other types of gearboxes, making them a cost-effective solution in the long term.

It is an important component in many industrial applications, providing high gear ratios, smooth operation, and low maintenance. It is an ideal solution for applications where a high reduction ratio is required, and where space is limited. They are commonly used in conveyor systems, packaging machinery, and construction equipment’s, making them a versatile and essential component for many industries.

Applications of Worm Gearbox

They are used in many industrial applications, including:

Conveyor systems – They are used to drive conveyor belts and other types of material handling equipment’s.

Packaging machinery – They are used in packaging machinery to control the movement of products on the production line.

Construction equipment – They are used in construction equipment such as cranes and hoists to lift and move the heavy loads.

When choosing a provider for your worm gearbox needs, KG International stands out as a leading provider with a wide range of high-quality products. With a focus on customer satisfaction and providing customized solutions, KG International is dedicated to meet the unique needs of each customer.


Worm gearboxes are an important component in many industrial applications. They offer high gear ratios, compact size, smooth operation, and low maintenance, making them an ideal solution for many applications.

KG International is a leading provider of worm gearboxes.

We offer a wide range of products to suit your needs.


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