Planetary Gear

An epicyclic gear teach (also known as planetary gear) contains two gears mounted so that the centre of one equipment revolves around the centre of the various other. A Drive Chain carrier links the centres of both gears and rotates to transport one equipment, called the earth gear or world pinion, around the additional, called the sun gear or sunlight wheel. The planet and sunlight gears mesh to ensure that their pitch circles roll without slide. A spot on the pitch circle of the planet equipment traces an epicycloid curve. In this simplified case, the sun gear is set and the planetary equipment(s) roll around the sun gear.

An epicyclic gear teach can be assembled therefore the planet gear rolls on the inside of the pitch circle of a set, outer gear band, or ring equipment, sometimes called an annular equipment. In this instance, the curve traced by a spot on the pitch circle of the earth is a hypocycloid.

The mixture of epicycle gear trains with a planet engaging both a sun gear and a ring gear is named a planetary gear train.[1][2] In this instance, the ring equipment is usually fixed and sunlight gear is driven.

Epicyclic gears obtain name from their earliest app, which was the modelling of the movements of the planets in the heavens. Believing the planets, as everything in the heavens, to become perfect, they could just travel in perfect circles, but their motions as seen from Earth could not end up being reconciled with circular movement. At around 500 BC, the Greeks invented the idea of epicycles, of circles traveling on the circular orbits. With this theory Claudius Ptolemy in the Almagest in 148 AD could predict planetary orbital paths. The Antikythera System, circa 80 BC, got gearing which was able to approximate the moon's elliptical route through the heavens, and also to correct for the nine-season precession of that route.[3] (The Greeks would have seen it not as elliptical, but rather as epicyclic motion.)

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