planetary gear
epicyclic gear
planet wheel
planet gear

The gearbox may incorporate planetary gears, which are also compact and efficient.

This variable ratio functions in addition to the torque multiplication of the planetary gears.

They are also called "planetary sharpeners", in reference to their use of planetary gears.

The AW is the simplest, using one set of planetary gears with four planets.

The same planetary gear used can be found on a large quantity of earth movers all over Europe.

Compared to the previous system it now uses a planetary gear differential that can transfer almost twice the torque between the rear wheels.

Oh, Worf, where do you keep the planetary exploration-survival gear?

With a slate-pencil screech the driver engaged his planetary gear and they were off.

Outside the planetary defenses, in any case, in an attempt to damage the Rix communications gear.

Additionally the gasoline engine contributes propulsion power via the planetary gear.