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Torsen Twin C
Torsen Twin C (T-3), a planetary type differential with front and center differential in the same unit, in that the nominal torque split of the center is not 50:50.
About this creation
This is the Lego version of the Torsen Twin C (T-3), a planetary type differential with front and center differential in the same unit, in that the nominal torque split of the center is not 50:50. Building this model has been a very hard challenge, with more than 90 parts, it is probably my best model.
This unit has been mounted in my current work in progress, the Lancia Delta Integrale, which also has a Torsen T-1 on the rear axle and many more features.

If you like this creation and you want know more, please visit my blog.

Here you can see the planetary gears, they allow to split 67% of torque on the rear axle and 33% on the front axle:


This is the front differential, a standard open type:


The bodywork is probabiliy one of the most critical parts, because it have to be strong and small. The one you see here is not the strongest, it is a lighter version, used to show the inside:


The input gear design has been the main idea to start building this differential:


Video


Features
Type: open
Width: 10 stud
Diameter: <7 stud
Input gear: 56 teeth
Rear gear: 56 teeth
Torque split: 33% at front and 67% at rear
Parts: 90 (may vary on the strength required)
Recommended wheels: 81.6 x 34

Hope that you liked it!

Please comment and rate! :)



Comments

 I like it 
  September 4, 2012
Glad you like my design yours is great too!! I liked it very much! You made a remark about the lack of center support for my axles in the diff. The focus was on compact and as you saw it is 6 studs wide and more importantly couples directly at 90 degrees with a 24 tooth crown gear as i displayed. The 8 tooth gears on either side hold the worms on the axles acting as central support and it functions perfectly even under high load. To be honest I was surprised how well it works considering its compactness:)
  August 30, 2012
Thanks for your reply. The 33-67 split I did notice already from your design. Looking forward to seeing the use of your design in the Lancia. yesterday I remade my rear axle in progress. With a LSD. Not realistic for my model, but a good way to get some slip prevention. It's an easy approach... easier than TORSEN but with other characteristics as well.
 I made it 
  August 27, 2012
Quoting Sander van Kreijl Don't see me as a party pooper, but as a curious human being... If I'm correct, this Twin Torsen you built, has got no TORSEN capability whatsoever. It is a double differential, true, but what could also be achieved by connecting two differentials. When you connect the center differential in front on the smaller gear (16) of the diff and aft on the big 24 teeth, you would getthe same force distribution. Still, without any TORSEN capability. Am I right, or have I misinterpreted your diff?
You made a right question. The TORque SENsing effect is achieved using helical gears; this model has no helical gears, so it hasn't the standard torque sensing effect; however also the true T-3 of the Lancia Delta Integrale has no helical gears, it uses viscous coupling to lock the center unit when slip occurs. The torque distribution is carried out as described, it can be demonstrated mathematically and experimentally: for each turn of the rear gear, the front differential makes two turns. If you invert the position of the front unit (it can be achieved by placing 8 teeth gear in place of the 16 teeth), you will get a torque split effect of 100% on the front and 0% on the back: if you don't believe this, try to build it! You will find that the rear gear will moves independently from the front unit and main gear, and front and main gear will lock together :) In this model, the blocking effect is obtained by exploiting two features: 1) the rear wheels receive more torque by default, so, if the front wheels slip, the former will continue to run; 2) because of the friction and the different gear ratio between rear and front, the latter needs high torque to run freely, so, if rear wheels slip, the front will continue to run. The major torque on the rear axle allows better climbing capabilities and less stress on the weak front differential. This behaviour has been tested on the Delta model, I will post a video in the next month. If you have other question, please ask! :)
  August 27, 2012
Don't see me as a party pooper, but as a curious human being... If I'm correct, this Twin Torsen you built, has got no TORSEN capability whatsoever. It is a double differential, true, but what could also be achieved by connecting two differentials. When you connect the center differential in front on the smaller gear (16) of the diff and aft on the big 24 teeth, you would getthe same force distribution. Still, without any TORSEN capability. Am I right, or have I misinterpreted your diff?
 I like it 
  August 26, 2012
smart engineering. weldone
 I made it 
  August 26, 2012
Thank you so much, I'm really happy you liked it! :)
 I like it 
  August 25, 2012
I have to agree with El Barto, this is a very complex lego creation. Looks pretty useful tho.
 I like it 
  August 25, 2012
Pretty cool! I think my Audi has a similar torque difference between the front and rear wheels. Wouldn't have thought someone would build such a complicated thing in Lego. Nice work, Dude!
 
By Daniele Lombardi
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