Physics animations by Yves Pelletier

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Mechanics | Electricity & Magnetism  |  Optics and Waves 




Applied Mechanics

Automatic Transmission (Simpson)

Product Code: APP0006

Price: 4 USD ( Order Form )

Files: 4 movies (512 X 384 pixels).  Each movie is provided in AVI and Quicktime format.

Description: These movies show 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).  

Simpson automatic transmission

Image from the animation (actual size).


Number of teeth

Sun Gears 24
Planets 12
Ring Gears 48



Gear Input Output Gear Ratio
1st Yellow Ring Gear Green Planet Carrier/Ring Gear Blue Planet Carrier held stationary 2.2 : 1
2nd Yellow Ring Gear Green Planet Carrier/Ring Gear Red Sun Gear held stationary 1.5 : 1
3rd Yellow Ring Gear Green Planet Carrier/Ring Gear All parts turn together 1 : 1
Reverse Red Sun Gear Green Planet Carrier/Ring Gear Blue Planet Carrier held stationary -2 : 1

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Ravigneaux automatic transmission
 
Compound Planetary Gearset (Ravigneaux)

Racks and pinion

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Main Page | Order Page | Contact author | Français 

Main Page | Contact author | Français

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