Physics animations by Yves Pelletier

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Mechanics | Electricity & Magnetism  |  Optics and Waves 




Applied Mechanics

Automatic Transmission (Ravigneaux)

Product Code: APP0007

Price: 4 USD ( Order Form )

Files: 9 movies (512 X 384 pixels).  Each movie is provided in AVI and Quicktime format.

Description: These movies show a Ravigneaux compound planetary gear set, used in automatic transmissions.  It is made of two planetary geartrains sharing the same ring gear (in the movies, the ring gear has been split in two parts to better see the inner mechanism).  Each transmission ratio is shown by three movies:  perspective view, front view and rear view. 

 The two yellow ring gears turn together.  All planets (short and long) are on the same planet carrier.

The animation at right is a free demo, reduced in size.

Ravigneaux automatic transmission

Image from one each animation (reduced size).

Number of teeth
Planets (long and short) 12
Little Sun Gear (magenta) 36
Large Sun Gear (orange) 60
Ring Gear (yellow) 84



Gear Input Output Gear Ratio
1st Little Sun Gear (magenta) Ring gear (yellow)
Planet Carrier held stationary 2.3 : 1
2nd Little Sun Gear (magenta) Ring gear (yellow) Large Sun Gear (orange) held stationary 1.6 : 1
3rd Little Sun Gear (magenta) Ring gear (yellow) All parts turn together 1 : 1
4th
(overdrive)
Planet Carrier Ring gear (yellow) Large Sun Gear (orange) held stationary 0.6 : 1
Reverse Large Sun Gear (orange) Ring gear (yellow) Planet Carrier held stationary -1.4  : 1

Ravigneaux automatic transmission

Image from one of the animations (actual size).

To purchase this set of animations:

Go to order page


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Mechanics | Electricity & Magnetism  |  Optics and Waves 

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