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Planetary Gearbox

Sun wheel (1), planetary wheels (2) and hollow ring-gear(3)

A simple planetary gearbox consists of a sun-wheel (1), planetary wheels (2) and a hollow ring-gear (3). The planetary gears are meshed together through a planet gear carrier. In the following formulae it is differentiated whether it solidly brakes in reverse gear, whether it is driven by the engine or connected to the axle drive. What is important is the respective allocation of the sun- and hollow ring-gear.

Planet gear carrier (driving):

z₂

i =

z₂ + z

z₂·(1 - i)

z =

i

z · i

z₂ =

1 - i

Planet gear carrier (driven):

z

i = 1 +

z₁

z = z₁ · (i-1)
z

z₁ =

i- 1

Planet gear carrier (fixed):

z₂

i =

z₁

z₂

z₁ =

i

z₂ = i · z₁

Please take note of the reverse of the rotation direction!

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Planetary Gearbox

Planet gear carrier (driving):

z2

i =

z2 + z

z2·(1 - i)

z =

i

z · i

z2 =

1 - i

Planet gear carrier (driven):

z

i = 1 +

z1

z = z1 · (i-1)

z

z1 =

i- 1

Planet gear carrier (fixed):

z2

i =

z1

z2

z1 =

i

z2 = i · z1

Please take note of the reverse of the rotation direction!

z₂

z₂ + z

z₂·(1 - i)

z₂ =

z₁

z = z₁ · (i-1)

z₁ =

z₂

z₁

z₂

z₁ =

z₂ = i · z₁