# Planetary gear

### How does a differential gear work?

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Learn more about the design, function and application of a differential gear and the differential lock in this article. https://youtu.be/HY3ZnjZtrQw Why does a car need a differential gear? In automobiles, the wheels are usually...

### How does a three-speed gear hub work?

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Learn more about the structure and function of the planetary gear in a three-speed gear hub in this article. https://youtu.be/8R3xzAdxYIc Assembly and function The figure below schematically shows the assembled components of a three-speed...

### Derivation of Willis equation (fundamental equation of planetary gears)

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The Willis equation describes the motion of the individual gears of a planetary gearbox (epicyclic gear). https://youtu.be/oXD9uJb_TOg Superposition of motions The change in speed of planetary gearboxes are no longer as easy to understand...

### How does a planetary gear work?

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A planetary gear is an epicyclic gear in which several gears (planet gears) mesh with a central gear (sun gear). https://youtu.be/cKjWcUvZuhM Stationary gearbox So-called stationary gearboxes are characterised by the fact that the gear wheels...