Plastic Internal Gears

Feida plastic internal gears have teeth on the inside of gear and are always used to mesh with external gears in a planetary gear drive system.They offer several notable advantages due to the plastic material.

Lightweight Design: Engineering plastics generally have a lower density than metals such as steel and copper.

Low Operating Noise: Plastic materials have inherent elasticity and damping characteristics that can absorb part of the vibration generated during gear meshing.

Corrosion Resistance: Many engineering plastics have good resistance to water, oils, and various chemical media.

Suitable for Mass Production: For plastic internal gear rings with mature structures and large demand, injection molding can be used to manufacture them, which is conducive to improving production efficiency and reducing the unit part cost.

Product Parameters

Manufacturing Process

Covering 45,000 square meters, Feida Machinery has over 150 employees, including a technical team of over 20 people. With an annual capacity of 15,000 tons, we handle everything from high-volume orders to small-batch trials.The manufacturing methods of our plastic internal gear rings mainly include two types.

For high-volume production, injection molding is one of the most commonly used manufacturing methods. With precision molds, complex internal tooth profiles can be formed efficiently, making the process well suited for mass production.

For low-volume production, prototypes, or components with special dimensional requirements, machining and CNC machining may also be used.

OEM/ODM/Customization

Feida provides custom plastic internal gear ring solutions based on customers' product designs, transmission requirements, and actual operating conditions.Custom options include:

Gear Parameters: Customized module, number of teeth, pressure angle, tooth profile, and other gear specifications.

Dimensions: Customized outer diameter, inner diameter, tooth width, wall thickness, overall height, and other dimensions.

Material: POM, PA, PEEK, and other engineering plastics are available according to application requirements.

Structural Design: Custom features such as flanges, positioning steps, mounting holes, keyways, grooves, clips, and other special structures.

Precision: Dimensional tolerances, concentricity, tooth profile accuracy, and other precision requirements can be customized according to transmission requirements.

Color: Different colors can be provided according to product design and application requirements.

Manufacturing Process: Precision injection molding, CNC machining, and other manufacturing processes can be selected based on product specifications and production volume.

How to select different types of plastic internal gears ?

We should evaluate the following 5 core dimensions based on your actual working conditions:

1.Load & Speed

2.Operating Temperature

3.Humidity & Chemical Exposure

4.Precision & Coaxiality

5.Mating Gear Material

For standard room-temperature, dry, light-load conditions, choose reinforced PA66 (best cost-performance). For humid or medium-load, precision applications, choose POM. For high-temperature, heavy-load, or ultra-long-life requirements, choose PEEK (costs 10× or more than the former). When in doubt, always conduct bench durability tests to verify tooth-root bending fatigue and wear loss.

Applications

The key reasons for choosing plastic over metal are noise reduction, weight saving, and lubrication-free operation.Our plastic internal gears are mainly used in the following four fields:

Automotive Components

Primarily used in power window regulators, electric seat adjusters, and power liftgate actuators. These applications have moderate loads but require quiet operation. Plastic gears significantly reduce noise during movement and eliminate the need for grease, which prevents interior staining.

Precision Drives (robotics/drones)

Commonly found in compact planetary gearboxes (e.g., robot joints, gimbal servos) and drone landing gear/door actuators. The self-lubricating property of plastics avoids grease solidification in vacuum or low-temperature environments, and also reduces overall weight.

Office & Smart Home

In printers/copiers' fusing units, specialty plastics like PEEK offer heat resistance and dimensional stability. In smart locks and electric drying racks, low noise is a key advantage, preventing disturbance during nighttime use.

Medical Disposables

In single-use surgical staplers or drug delivery devices, plastic internal ring gears are disposable, making them far less expensive than metal and eliminating cross-contamination risks.

Company introduction

About technology teams: We have a professional engineer team ,and most of them have more than 15 years of experience in transmission parts manufacturing industry.

About equipment: Feida has the high quality CNC & EDM machines from HAAS,MOKRON,KOUMA,AGIE,MAKINO,including 3-axis,4-axis, and 5-axis CNC machines,and it can offer stable and accurate processing ability.

About delivery: Our workers and engineers work for more than 8 hours.

It takes 20-30 days to make samples and 30-45 days to complete mass production.