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Planetary gear trains, also known as epicyclic gear mechanisms, are one of the most important and interesting inventions in engineering. They have an incredible speed variation mechanism and are often used in automobiles as a key part of automatic transmissions. In this video, we will dig deep into the secrets of planetary gear mechanisms. Be our supporter or contributor: / @sabincivil instagram : / sabinzmathew Twitter : / sabinsmathew Telegram : https://t.me/sabinmathew FB : / sabinzmathew Narration: Koji Asano Website: https://www.justglobal.jp/japanese