The Planetary Gear Set – This is how it works!

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The Plantery gearset contains of planetary gear which are capable of supplying a lot of torque and speed reduction in a small package and have operating characteristics which are beyond those of fixed-axis gear trains. However, to fully understand the peculiar planetary gears, we need to start from the very beginning.

If you take apart and look inside an automatic transmission, you will find many parts in a fairly small space. Among those parts is the planetary gearset which is the center of attention. This part creates all of the various gear rations that an automatic transmission can produce. Everything else that you would find inside the transmission is simply there to help the planetary gearset do its thing. It’s an amazing piece of gearing and one automatic transmission contains of two planetary gearsets which are folded together in one component.

Any planeteary gearset has got 3 main components: the ring gear, the planet gears and the planet gears’ carrier and the sun gear. Every components can serve as the output, input or can be held stationary. Which piece plays what role determines the gear ratio. In the video below, we’re checking out a single planetary gearset to see how it works – check it out!