Differential - heavy trucks, independent suspension axles, basic principle

Differential developed by Hans Ledwinka, in 19s.
Symmetrical differential in independent suspension axles for heavy trucks, basic principle animation with lock mechanism.
For real usage is needed helical gear!!! (quiet operation, higher forces, higher main axle). For my basic principle direct gear is enough.
You can combine more differential for 6x6, 8x8, etc.
In my animation middle gears are in rotation (after differential is locked, but due to fps it is not seen).

http://patentimages.storage.googleapis.com/pages/US1733688-1.png

This concept is used by TATRA or STEYR. (Tatra concept)
http://en.wikipedia.org/wiki/Tatra_(company)

http://www.curbsideclassic.com/automotive-histories/automotive-history-hans-ledwinkas-revolutionary-tatras/

http://www.pinztrek.com/pinz/steyr_history.htm

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