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Planetary systems

A Planetary gear system consists of a central gear, referred to as the sun gear and a number of gears referred to as planets. A planetary gear mechanism is a construction of gears, in which the driving axle and the driven axle are in one line. A planetary gear mechanism is used to implement a gear mechanism in a small space for  high gear ratios and for the transmission of large amounts of power.

In a planetary wheel mechanism, the following gears play a role:

    A sun gear: attached to a central axle..
    A planet gear: usually three or more, revolve around the sun wheel.
    A planet gear carrier: connects the planet gears.
    A satellite gear: forms the outer gear and is connected to a second axle.