In a simple planetary gear set, which gear acts as the sun around which others orbit?

In a simple planetary gear set, which gear acts as the sun around which others orbit?

• A. Sun gear
• B. Ring gear
• C. Carrier
• D. Planet gears

Answer: (A)

In a simple planetary gear set, the sun gear is the central gear around which the planet gears orbit. The planet gears mesh with both the sun gear and the inner teeth of the outer ring gear, forming the core interaction that creates the planet arrangement. The carrier is the structure that holds the planet gears together and provides the output or input depending on the configuration, while the ring gear is the outer gear with internal teeth that surrounds the system. Because the others are arranged around this central gear and interact with it, the sun gear is the one that acts as the central reference around which the system’s motion revolves.

In a simple planetary gear set, the sun gear is the central gear around which the planet gears orbit. The planet gears mesh with both the sun gear and the inner teeth of the outer ring gear, forming the core interaction that creates the planet arrangement. The carrier is the structure that holds the planet gears together and provides the output or input depending on the configuration, while the ring gear is the outer gear with internal teeth that surrounds the system. Because the others are arranged around this central gear and interact with it, the sun gear is the one that acts as the central reference around which the system’s motion revolves.