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Simpson compound planetary gear set

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Published on May 7, 2011

This animation shows a Simpson compound planetary gear set, used in automatic transmissions. It is made of two planetary gear sets sharing the same sun gear (colored orange in the movies). The green planet carrier turns together with the green ring gear. Each movie shows a different transmission ratio (see table below).

Number of teeth:

Sun Gears 24
Planets 12
Ring Gears 48




1st Gear:
Input: Yellow Ring Gear
Output: Green Planet Carrier/Ring Gear
Blue Planet Carrier held stationary
Ratio: 2.2 : 1


2nd Gear:
Input: Yellow Ring Gear
Output: Green Planet Carrier/Ring Gear
Red Sun Gear held stationary
Ratio: 1.5 : 1

3rd Gear:
Input: Yellow Ring Gear
Output: Green Planet Carrier/Ring Gear
All parts turn together
Ratio: 1 : 1

Reverse:
Input: Red Sun Gear
Output: Green Planet Carrier/Ring
Gear Blue Planet Carrier held stationary
Ratio: -2 : 1

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