Metal Internal Gears

The metal internal gears made in Feida machinery factory are cylindrical gears with spur or helical teeth cut on the inner surface ,meshing with extermal gears.They play a significant role in planetary gear mechanisms and high-precision transmission systems due to their compact structure, high transmission efficiency, and strong load-bearing capacity.

Core parameters of these gears include module,number of teeth, pressure angle,face width, etc.

Material Selection

The material of the component should be selected according to factors such as load, rotational speed, operating environment, and expected service life. Common materials include alloy steel,stainless steel,etc.

Alloy steel: Is one of the most widely used materials, such as 20CrMnTi, 40Cr, etc.After heat treatments such as carburizing and quenching, it offers high tooth surface hardness,good wear resistance,and strong impact resistance,making it suitable for high-load applications such as automobiles and industrial reducers.

Stainless Steel: Offer excellent corrosion resistance.

Production Process

With over 30 years of development,Feida can provide end-to-end services from raw material procurement to manufacturing and packaging, ensuring efficiency and precision in every product.These service are as follows:

Raw material selection: Various materials such as steel,aluminum, brass are sourced from original manufacturers.

Forging: Raw materials(e.g., 40Cr,20CrMnTi) are cut to size and forged to obtain a blank close to the final shape.

Rough turning: The outer diameter, inner bore, and end faces are initially turned to approximate final dimensions, leaving machining allowances.

Tooth forming: This is the technical key. The most widely used method of this technology is gear shaping. Rough shaping and finish shaping are often performed as two separate passes to ensure accuracy.

Heat treatment: The common method of this process is Quenching and Tempering,which Often performed after rough tooth cutting to achieve a good balance of strength and toughness.For extremely demanding applications, surface hardening processes such as carburizing or carbonitriding are applied after finish machining.

Quality Control

Feida quality control implemented throughout the entire manufacturing process,including four inspection stages:

Incoming Quality Control (IQC)

In-Process Quality Control (IPQC)

Final Quality Control (FQC)

Outgoing Quality Control (OQC)

In terms of inspection capabilities,we are equipped with mechanical test machine, material analysis spectrometer, coordinate measuring machines (CMM), roughness tester, hardness tester, etc.

Application Fields

Our metal internal ring gears are primarily used as the core component in planetary gearboxes / planetary transmissions.Their main function is to transmit high torque and reduce speed while increasing torque. The specific application areas include:

Automotive & New Energy Vehicles

Widely used in automatic transmissions (AT/CVT) and hybrid dedicated transmissions (DHT) in new energy vehicles, to smoothly transfer power from the motor or engine. For NEVs, thin-wall internal ring gears are often adopted to reduce weight.

Industrial Robots

Used in the RV reducers of robot joints, where extremely high tooth profile accuracy and rigidity are required. These directly determine the positioning accuracy and load-bearing life of the robot arm.

Construction & Mining Machinery

Found in the travel/swing reducers of excavators, bulldozers, and heavy haulers. These ring gears are typically large in size, must withstand severe impact loads, and are usually carburized and hardened.

Wind Power

Installed in the gearbox of wind turbine drivetrains to step up the low rotational speed for power generation. Ring gear diameters can exceed 2 meters, making them extra-large, heavy-duty precision components.

Packaging

In Feida's factory,every transmission component is securely packaged to prevent damage during shipping.We have various packaging options as follows:

Plastic boxes

Outer mesh bags

Rust-resistant paper

Bubble bags

Cartons

Wooden boxes

Shipping

Feida offers worldwide shipping with multiple options, including air freight, sea freight, and express delivery.

FAQ

What level of gear accuracy can your company achieve?

Their precision grade is up to ISO/DIN 8-10 level.

What metal materials do you process?

a variety of metal materials,such as carbon steel (e.g., 45),alloy steel (e.g., 40Cr, 42CrMo, 16MnCr5, 20CrMnTi) ,stainless steel (e.g., 304, 630, 1.4104, 1.4057),aluminum alloy (e.g., 6061, 7075),bronze, brass,etc.

What module range can you company achieve?

From M0.5 to M8.

How long is your delivery time?

20-30 days for a sample order, 30-45 days for a bulk order.

How do you ensure gear quality and consistency?

We have been paying more attention to product quality.

From raw material selection to the final product, Feida follows a strict and comprehensive quality control system.