Planetary Gear Systems


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Leading the Future of Mechanical Excellence: Your Premier Source for Planetary Gear Systems

Founded over two decades ago, our company has grown into a leading manufacturer and supplier of planetary gear systems. With a state-of-the-art manufacturing facility spanning over 50,000 square meters and a team of 500 highly skilled engineers and technicians, we are committed to delivering superior quality and innovative solutions. Our technical prowess is evidenced by our numerous patents and our dedicated R&D center, which continually pushes the boundaries of gear technology.

Our planetary gear systems are renowned for their compact design, high torque density, and exceptional efficiency. These systems are ideal for a wide range of applications, including automotive transmissions, wind turbines, industrial robots, aerospace technology, and renewable energy systems. The unique characteristics of our planetary gear systems—such as uniform load distribution, high power density, and modular design—ensure reliability and long service life even in the most demanding environments.

As specialists in planetary gear systems, we have established ourselves as a pivotal player in the industry. Our products are trusted by major manufacturers and have a global presence, reflecting our influence and expertise in this niche market.

Our service philosophy centers on customer satisfaction and comprehensive after-sales support. We offer tailored solutions to meet specific client needs, backed by a robust support network that ensures minimal downtime and maximum performance. Our commitment to continuous innovation keeps us at the forefront of the industry, enabling us to deliver cutting-edge technology that drives our customers’ success.

Choose us for unparalleled quality, expert knowledge, and a partnership that prioritizes your operational excellence and growth.


What are planetary gear systems?

A planetary gear system is a complex and efficient mechanical transmission system consisting of a central gear (sun gear), multiple small gears (planet gears) that rotate around the central gear, and an outer ring gear (ring gear). This system is called a “planetary” gear system because the planetary gears rotate around the sun gear, just like the planets rotate around the sun.

Common applications of planetary gear systems

1. Automotive Industry
Automatic transmission: Planetary gear system is the core component in automatic transmission, providing smooth gear conversion and efficient power transmission.
Hybrid vehicles: Used to efficiently transmit power from internal combustion engines and electric motors to wheels.
2. Wind power generation
Wind turbines: Planetary gear system is used to convert low-speed wind force into high-speed rotational motion, thereby driving the generator and improving the efficiency of wind power generation.
3. Industrial robots
Precision motion control: Planetary gear system provides precise motion control in robot joints, ensuring high precision and high repeatability of robots.
4. Aerospace
Aircraft transmission system: Used in various transmission systems of aircraft and spacecraft, providing high reliability and high-efficiency power transmission.
5. Heavy machinery
Construction and mining equipment: Such as excavators, bulldozers and mining trucks, planetary gear system provides strong torque and efficient power transmission, adapting to harsh working environments.
6. Renewable energy
Solar tracking system: Used in solar power generation equipment to ensure that solar panels always face the sun and improve power generation efficiency.
Hydroelectric power generation equipment: used to efficiently transmit the power of turbines in hydroelectric power plants.
7. Medical equipment
Precision medical equipment: such as surgical robots and diagnostic equipment, planetary gear systems provide precise motion control and high reliability.


How planetary gear systems work

1. Drive and output
Sun gear drive: When the sun gear rotates, it drives the planetary gears that mesh with it to rotate.
Planet carrier output: The planetary gears not only rotate around the sun gear, but also drive the planetary carrier to rotate together, thereby achieving output.
2. Load distribution
Multiple planetary gears mesh with the sun gear and the ring gear at the same time, evenly distributing the transmitted load, reducing the stress of a single gear, and improving the life and reliability of the system.
3. Deceleration and speed increase
Deceleration effect: The planetary gear system can achieve different reduction ratios by changing the ratio of the number of teeth of the gears. Usually, the sun gear is input, the planetary carrier is output, and the ring gear is fixed to achieve deceleration.
Speed ​​increase effect: On the contrary, if the sun gear is fixed, the ring gear is input, and the planetary carrier is output, the speed increase effect can be achieved.

Features of planetary gear systems


High Power Density

Planetary gear systems can transmit high power in a relatively small volume and are suitable for applications that require high power transmission, such as wind power generation and industrial robots.


Low Noise and Vibration

Planetary gear systems run smoothly with low noise and vibration, especially when manufactured with high precision and well-lubricated. This makes them ideal for applications that require quiet and stable operation.


Efficient Transmission

With a mechanical efficiency of over 95%, planetary gear systems can achieve efficient power transmission in a small volume. This is due to multiple gears meshing simultaneously, which reduces energy losses.

Materials used to make planetary gear systems

1. Steel
High-strength alloy steel: commonly used to manufacture sun gears, planetary gears and ring gears. High-strength alloy steel has excellent strength and wear resistance, suitable for high-load and high-torque applications.
Carbon steel: used in some less demanding applications, with good strength and machinability.
2. Cast iron
Gray cast iron: used to manufacture ring gears and planetary carriers, with good wear resistance and vibration damping performance.
Ductile iron: strength and toughness are better than gray cast iron, suitable for applications requiring higher strength and durability.
3. Bronze
High-phosphor bronze: commonly used to manufacture bearings and bushings, with excellent wear resistance and low friction coefficient.
Aluminum bronze: used in applications requiring corrosion resistance and high strength.
4. Aluminum alloy
Used to manufacture planetary carriers and some low-load gear components, aluminum alloys have light weight, moderate strength and good machinability.
5. Plastics
Engineering plastics: such as polyoxymethylene (POM), nylon (PA) and polyester (PET), etc., are often used to manufacture gears for low-load and low-noise applications. Plastic gears have self-lubricating properties and good corrosion resistance.
High-performance plastics: such as polyetheretherketone (PEEK), used in applications requiring high temperatures and high chemical stability.
6. Composites
Composites can be used in some special applications to provide good strength-to-weight ratio and corrosion resistance.
7. Cemented carbide
Used to manufacture gear components that require high wear resistance and high strength, especially in high wear and high stress environments.
8. Surface treatment and coating
Carburizing and quenching: Improve the hardness and wear resistance of the gear surface while maintaining the toughness of the gear core.
Nitriding: Increase the hardness and wear resistance of the gear surface, suitable for high precision and high load applications.
Coating: Such as chrome plating, nickel plating, etc., used to improve the corrosion resistance and reduce friction of gears.

Common manufacturing methods for planetary gear systems

1. Gear Cutting
Hobbing: Hobbing is a common gear cutting method that uses a hob to machine the gear tooth shape. It is suitable for mass-produced spur and helical gears.
Shaping: Shaping uses a shaping cutter for cutting. It is suitable for machining internal and external gears, especially gears with complex tooth shapes.
Planing: Planing is used to machine large-module gears and internal gears, usually for low-volume production.
2. Gear Grinding
Grinding is the finishing of gears by a grinder to improve the accuracy and surface quality of the gears. It is often used in the manufacture of high-precision and high-performance gears.
Shaving: Shaving is a finishing process used to perform micro-cutting on gears after heat treatment to improve the tooth shape and surface finish.
3. Heat Treatment
Carburizing and Quenching: Carburizing and quenching is to enhance the hardness and wear resistance of the gear surface by infiltrating carbon into the gear surface at high temperature and then quenching.
Nitriding: Nitriding is the process of infiltrating nitrogen into the surface of the gear at low temperature to form a hardened layer, which improves the surface hardness and wear resistance of the gear without affecting the overall size of the gear.
4. Casting and Forging
Precision Casting: Used to manufacture gears and planetary carriers with complex shapes, suitable for small and medium-sized batch production.
Hot Forging: Through a forging process at high temperature, high-strength gear blanks are manufactured, and then subsequent processing is performed, which is suitable for mass production of high-strength gears.
5. Powder Metallurgy
Sintered Gears: By pressing metal powder into shape and then sintering at high temperature, high-precision and high-strength gears are manufactured, which are suitable for mass production of small gears.
6. Plastic Injection Molding
Injection Molding Gears: Used to manufacture engineering plastic gears, suitable for low-load and low-noise applications, and commonly used in consumer electronics and household appliances.
7. 3D Printing
Additive Manufacturing: 3D printing technology is used to manufacture complex-shaped gears and prototypes, which is suitable for rapid prototyping and small-batch production.
8. Assembly and Debugging
Precision Assembly: Ensure the precise alignment and assembly of each component to ensure the smooth operation and efficient transmission of the planetary gear system.
Testing and Tuning: Various tests (such as load test, noise test, vibration test, etc.) are used to ensure that the performance of the gear system meets the design requirements.


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Why choose our company?

1. High-quality products: Our company is committed to providing the highest-quality planetary gear systems. Our products are precision-engineered and manufactured using advanced materials to ensure durability, reliability, and consistent performance.

2. Comprehensive Service: We pride ourselves on providing excellent customer service. Our professional team is ready to answer your questions, provide technical support, and provide solutions tailored to your needs.

3. Competitive Prices: Our company offers competitive prices without compromising quality. We believe in creating value for our customers and work hard to ensure our products fit every budget.

4. Excellent after-sales support: We know a product is only as good as the support you receive after purchasing it. Our company provides comprehensive after-sales services, including timely repair, replacement, and maintenance, ensuring that your planetary gear systems is in optimal condition for a more extended period.

5. Rich product range: Our company provides a variety of planetary gear systems shafts to meet different applications and requirements. We can provide you with the right product.