how does planetary gear work

Understanding the Working of Planetary Gears and Choosing the Best

How Does Planetary Gear Work?

A planetary gear set includes the sun gear at the center, ring gear on the outside, and what we call planet gears that rotate around the sun gear, all within the ring gear. The key to their functioning lies in the ability to change the speed and direction of the power transmitted, depending on which component (sun gear, planet gears, or ring gear) is driving, driven, or held stationary.

Our High-Quality Planetary Gears

We take pride in producing top-quality planetary gears with the following features:

1. Robust Design

Our gears are designed to handle high torque levels while maintaining a compact size, making them ideal for various applications.

2. High Efficiency

They offer high power transmission efficiency, ensuring optimal performance.

3. Versatility

Planetary gears can be used in single-stage or multi-stage configurations, allowing for a wide range of gear ratios.

4. Durability

They are made from durable materials that can withstand tough working conditions.

5. Precision

Our gears are precision engineered for accurate power transmission.

Different Types of Planetary Gears and Their Features

There are various types of planetary gears, each with unique characteristics.

Single-Stage Planetary Gear Set

This type has one set of planetary gears and is known for its compactness and high torque capacity.

Multi-Stage Planetary Gear Set

Multi-stage sets have multiple sets of planetary gears, offering higher gear ratios and torque capacity.

In-Line Planetary Gear Set

In these, the input and output shafts are aligned, making them suitable for applications requiring high rotational speeds.

Offset Planetary Gear Sets

These have offset input and output shafts, making them suitable for applications requiring high torque.

Coaxial Planetary Gear Set

These are designed with the input and output shafts in the same line, offering high power density and efficiency.

Right-Angle Planetary Gear Sets

These are suitable for applications where the input and output shafts need to be at right angles.

Harmonic Drive Planetary Gear Set

These are known for their high precision, compactness, and zero backlash.

Differential Planetary Gear Sets

These are used in automotive applications for torque splitting and differential action.

Simpson Planetary Gear Set

The Simpson set is a type of multi-speed planetary gear set used in automatic transmissions.

Ravigneaux Planetary Gear Set

The Ravigneaux set is a double planetary gear set used in automatic transmissions.

Choosing the Right Planetary Gears


When selecting planetary gears, various factors need to be considered, such as Gear Ratio, Load Capacity, Accuracy, Efficiency, Size, Weight, Axial and Radial Loads, and Speed Range. Understanding these parameters is crucial for selecting the gear that best fits your needs.

Our Manufacturing Process

The manufacturing process of our planetary gear sets involves multiple steps, including Design and Engineering, Material Selection, Material Processing, Gear Manufacturing, Assembly, Heat Treatment, Surface Treatment, Quality Control, and Final Assembly and Testing.

Our Other Gear and Gearbox Products

In addition to planetary gears, we also offer a wide range of other gears and gearboxes, such as worm gear, helical gear, spur gear, bevel gear, and gear rack.

About Our Company

We are equipped with advanced production and inspection equipment, including CNC Gear Grinding Machines, Gear Measuring Machines, CNC Gear Shapers, Machine Centers, CMMS, and Torque Test Systems. With our professional expertise, international certifications, custom services, and excellent after-sales service, we are committed to providing the best quality products and service to our customers. Let us be your trusted partner in all your gear and gearbox needs.