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.
