Epicyclic Gearbox,also known as planetary gearbox, is a mechanical transmission device designed based on the principle of planetary gear system transmission. Its core feature is that gears rotate around their own axis (self rotation) and another fixed axis (revolution), achieving power transmission, speed regulation, and torque conversion through this "composite motion". It is essentially a different term for the same type of device as the "Planetary Gearbox". "Epicyclic" emphasizes the rotational motion characteristics of gears, while "Planetary" is a visual analogy to the motion of planets around stars. The two are completely identical in structure and principle.
Epicyclic and Planetary are often interchangeable in the engineering field, but "Epicyclic" is more commonly used in academic literature, while "Planetary" is more commonly used in industrial applications. Both are composed of Sun Gear, Planet Gears, Ring Gear, and Carrier, which achieve variable speed by fixing or driving different components.
Epicyclic Gearbox in comparison with other gearboxes:
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Features |
Epicyclic/Planetary Gearbox |
Parallel Shaft Gearbox |
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Structural |
coaxial layout, compact |
multi axis parallel, occupying a large space |
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Load distribution |
Multiple planetary gears distribute the load, high load-bearing capacity |
single pair gear meshing, easy to wear |
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High efficiency |
(up to 97% or more) |
slightly lower (affected by axial force) |
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Application scenarios |
Precision transmission (such as robots, gearboxes), |
Simple power transmission (such as motor reducers) |
Here In this page, we introduce our PGHR serial Planetary Gear Reducers, you will see data sheet,finished gearboxes,videos of test as follows:
Also You are welcome to watch more projects or visit our video gallery by Youtube: https://www.youtube.com/@tallmanrobotics
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Angle High Precision Helical Gear Series:PGHR Stage 1 |
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Angle High Precision Helical Gear Series:PGHR Stage 2 |
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Typical application scenarios of Epicyclic Gearbox
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Automatic transmission for automobiles |
Control the fixation/rotation of planetary gear components through clutches and brakes to achieve seamless shifting (such as ZF 8HP transmission). |
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Wind turbine |
Increase the low-speed impeller speed to the required high speed of the generator while withstanding high torque. |
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Aerospace |
The main reducer of a helicopter needs to transmit tremendous power under lightweight conditions. |
The difference in terminology between Epicyclic Gearbox and Planetary Gearbox arises from the description of angles (motion vs. structure). The advantages lie in coaxial transmission, high power density, and multi speed ratio flexibility, making it the preferred design for high-end transmission systems.
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