Definition
An epicyclic train is a gear system where one or more gears (planetary gears) rotate around another central gear (sun gear). Imagine it as a mini solar system of gears! This arrangement allows for complex speed and torque ratios in a compact space. It's often used in automatic transmissions and other mechanical devices. Think of it as the gearbox version of a planetary orbit. βοΈ It is a clever way to change speed.