The planetary carrier is a core component of a planetary gear train. It holds the planet gears in precise positions, allowing them to revolve around the central sun gear while rotating on their own axes. Typically designed as a cage or flange structure, it transmits torque from the input shaft to the planet gears and then to the ring gear or output shaft. Made from high-strength alloy steels, carriers must withstand heavy loads, fatigue, and high speeds. They are widely used in automotive automatic transmissions, wind turbine gearboxes, aerospace actuators, and industrial reducers, where compactness, high power density, and smooth torque distribution are essential for reliable performance.
Planetary carriers For Planetary Reducers
Specification
Module
NA
Application
Planetary reducers
Material
Q345D
Heat Treatment
NA
Accuracy
NA
How Do Planetary Carriers Work?
A planetary gear set has three parts: a sun gear in the center, a ring gear on the outside, and a carrier that holds small planet gears between them.
The planetary carrier is like a cage or a frame. It holds the planet gears so they can spin on their own pins. But the carrier itself can also rotate around the sun gear. When the carrier turns, it moves the planet gears in a circle around the sun gear.
In a gearbox, you can use the carrier as an input, an output, or hold it still. For example, if you drive the sun gear and keep the ring gear fixed, the carrier turns slowly but with much more force (torque). If you drive the carrier, the ring gear turns faster. By locking or releasing different parts, the system can give you lower speed, higher speed, or reverse.
The carrier is important because it shares the load among several planet gears. This makes the gearbox strong, smooth, and compact. That’s why planetary carriers are used in car automatic transmissions and hybrid vehicles.
Production process
6-Step Production Process
Forging
Turning
Gear Cutting
Heat Treatment
ID & OD & Surface Grinding
Tooth Grinding
Forging
When gears need high performance that needs to withstand high loads, high stress, impact loads or fatigue loads, forgings are suggested to use. Forging allows metal fibers to be continuously distributed along the gear profile, significantly improving root strength and fatigue life.
Turning
This is the process of cutting and shaping solid materials into precise parts. It uses tools like lathes, mills, and drills to remove excess material. Machining transforms a simple block of metal into a finished, functional component.
Gear Cutting
Gear Cutting includes all processes to create gear teeth after rough or fine machining. It shapes teeth to ensure smooth and efficient power transfer for performance, strength and cost efficiency.
Heat Treatment
Gears need to be running with two gears or above two gears, that makes them easy to be worn-out. That’s why most types of gears need to be harden through heat treatment.
ID & OD & Surface Grinding
ID grinding, OD grinding, Surface grinding are all belonging to CNC grinding which are the foundational precision abrasive machining processes used to achieve exceptional dimensional accuracy and surface finishes, especially on hardened materials.
Tooth Grinding
Tooth Grinding are the final processes are applied after heat treatment to correct distortion, improve geometry, and achieve the final surface finish necessary for quiet, efficient power transmission.
Inspection
Strict Quality Inspection
Dimension Inspection
Material Inspection
Heat Treatment Testing
UT & MT Testing
Meshing Testing
Accuracy Testing
Dimension Inspection
Material Inspection
Heat Treatment Testing
UT & MT Testing
Meshing Testing
Accuracy Testing
Packages
Professional Packaging Safe Arrival
Customized cost-effective packages for products protection. We select multi-model solutions, combining air, sea, or land freight for the optimal balance of cost, speed, and reliability.
Inner Package
Out Package
Carton
Wooden Package
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