Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear.

Epicyclic gearingEpicyclic gearing or or planetary gearingplanetary gearing is a is a geargear system consisting of one or system consisting of one or more outer gears, or more outer gears, or planetplanet gears, revolving about a gears, revolving about a central, or central, or sunsun gear. gear. Typically, the planet gears Typically, the planet gears are mounted on a movable are mounted on a movable arm or arm or carriercarrier which itself which itself may rotate relative to the may rotate relative to the sun gear. Epicyclic gearing sun gear. Epicyclic gearing systems also incorporate systems also incorporate the use of an outer ring the use of an outer ring gear or gear or annulusannulus, which , which meshes with the planet meshes with the planet gears. gears.

AdvantagesAdvantages

CCompared to conventional gearboxes has ompared to conventional gearboxes has smaller dimensionssmaller dimensions

EEasier to sort through the constant rounds of asier to sort through the constant rounds of shotshot

Greater durability than conventional bikes in Greater durability than conventional bikes in geargear

EEasy to achieve high transmission ratio due to asy to achieve high transmission ratio due to the sizethe size

DisadvantagesDisadvantages

MMore expensive than conventional ore expensive than conventional production of gearboxesproduction of gearboxes

MMore complex than conventional ore complex than conventional transmissiontransmission

DDrawing of the planetary gearrawing of the planetary gear

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