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Epicyclic gear
- An epicyclic gearbox, also known as a planetary gearbox, is a type of automatic transmission system that uses a sun gear, planet gears, and a ring gear to achieve various speed ratios in forward and reverse directions
- In an automobile, an epicyclic gear train is used as a differential gear. The differential gear is located between the drive wheels of the vehicle and allows the wheels to rotate at different speeds while turning
- This is necessary because when a vehicle turns, the outside wheel has to travel farther than the inside wheel and therefore needs to rotate faster