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In this video we take a closer look at the structure and function of planetary gears. In a planetary gear, the so-called planetary gears rotate around a central gear, the sun gear. The planetary gears are surrounded by an internally toothed ring gear. The planetary gears are attached to a so-called planet carrier (also known as a web). The planet carrier in turn is connected to a shaft that runs through the shaft of the ring gear. Depending on which component is permanently mounted (ring gear, web or sun gear) and which component is the input or output, different gear ratios can be achieved with a planetary gear. Planetary gears are therefore particularly suitable as manual transmissions and are used in hub gears on bicycles or in automatic transmissions in motor vehicles. 00:00 Stationary gear 01:29 Ring gear as output gear 03:17 Inserting additional intermediate gears (planetary gears) 04:12 Mounting the intermediate gears on a carrier plate (web) 06:15 Advantages of planetary gears 07:01 Gear ratio I: Fixed ring gear 07:47 Gear ratio II: Fixed planetary gear carrier (web) 08:29 Gear ratio III: Fixed sun gear 08:54 Gear ratio IV: Direct drive 09:19 Summary