Compound Planetary Gearbox

What is a Compound Planetary Gearbox?

Compound planetary gearboxes-also known as multi-stage series planetary reducers-consist of two or more independent planetary gear sets arranged in series. The output from the planet carrier of one stage serves as the input for the sun gear of the subsequent stage. By stacking multiple gear sets, these units achieve high gear reduction ratios and significant torque amplification-a design that differs from single-stage planetary, fixed-axis, or worm-gear transmission systems.
Standard single-stage planetary gearboxes have limited reduction ratios; achieving low-speed, high-torque output typically requires the addition of external fixed-axis gear sets, which significantly increases the overall size of the assembly. In contrast, compound planetary systems perform multi-stage reduction within a coaxial structure, enabling higher gear ratios and greater power density within a compact installation space.
This series of compound planetary gearboxes features hardened, ground-finished gears and a floating load-equalization mechanism. Available in two-stage or three-stage configurations, they are compatible with various drive sources, including servo motors, asynchronous motors, DC motors, and hydraulic motors. They support multiple output interfaces-such as flanges, splines, and hollow shafts-and are designed to handle both high-precision positioning tasks and continuous, heavy-load transmission applications.

 

 

Types: P2N,P2L,P2S,P2K,P3N,P3S,P3K

 

 

• Coaxial compound configuration for a compact footprint at high gear ratios
  Multiple planetary gear stages are arranged in series along a common axis, eliminating the need for redirection gears and resulting in a significantly smaller axial dimension compared to multi-stage fixed-axis gearboxes. This design maintains high power density across a broad gear ratio range-from 10:1 to 1000:1-making it ideal for integrated applications where internal space is limited.
• Multi-planetary load-sharing design ensures stable load-bearing capacity.
  In each planetary stage, the load is distributed among 3 to 4 planetary gears. A floating sun gear structure mitigates uneven loading and facilitates stress dispersion under impact loads. With ample margin for short-term peak torque, this design is well-suited for industrial applications characterized by frequent start-stop cycles and significant load fluctuations.
• Precision-ground, hard-faced gears for extended fatigue life.
  The gears undergo a carburizing and quenching process followed by precision grinding, achieving an accuracy level of ISO 6–7. The high surface hardness ensures minimal wear; under S1 continuous duty, the transmission noise and backlash variation remain well-controlled during long-term operation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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