Planetary Gear

https://www.youtube.com/watch?v=ARd-Om2VyiE Often used in automobiles.

4 main parts

• Sun gear
• Planet gear
• Ring Gear
• Carrier

Tangential speed is the same, but angular speed is different.

Video

• How to model Planetary Gears; Requirements, Gear Ratios, Helical/Herringbone (Gears pt 5/7) - YouTube
• 3D Printed Stackable PLANETARY GEARBOX - Unlimited Gear Ratio