Thread: ATBs or Torque Biassing Diffs and how they work

Originally Posted by Slunnie

Stability control in a Defender? Do you mean air in the tyres?

They got pretty fancy near the end!

Originally Posted by TheGrumpy

They got pretty fancy near the end!

Oh I thought it was a joke! That is impresive.

Originally Posted by Slunnie

Oh I thought it was a joke! That is impresive.

ABS, ETC, DSC. They had the whole lot from MY15, it was even an option on the 130.

Originally Posted by Slunnie

Stability control in a Defender? Do you mean air in the tyres? 2:

Air and sway bars

I've only just started to read this thread, so apologies if this has been mentioned before, but...

Originally Posted by tact

Eaton Truetrac video on youtube Exploded View - Inside the Eaton TrueTrac Differential - YouTube

Is it just my eyes or at 1:58 in the video are the two output shafts from the TrueTrac rotating in different directions? i.e. one wheel would be turning forwards and one rearwards. The output shaft on the left (closest) is turning the same direction as the diff housing, but the right side shaft (furthest away) is rotating the opposite direction. Surely this is not right as the two wheels on the one Axel would be traveling in opposite directions then...?

On a second look through it also seems to happen at 1:18 to 1:27 as well...

Having looked at various options for myself and reading a bit about the different options available, I had trouble fully understanding the concept of spin with respect to the torsen/ATB design until I saw this video:



That video makes far more sense to me.

Originally Posted by twr7cx

I've only just started to read this thread, so apologies if this has been mentioned before, but...



Is it just my eyes or at 1:58 in the video are the two output shafts from the TrueTrac rotating in different directions? i.e. one wheel would be turning forwards and one rearwards. The output shaft on the left (closest) is turning the same direction as the diff housing, but the right side shaft (furthest away) is rotating the opposite direction. Surely this is not right as the two wheels on the one Axel would be traveling in opposite directions then...?

On a second look through it also seems to happen at 1:18 to 1:27 as well...

I think they mention in the voice over (?), they are showing "relative" movement of the half shafts to each other, at those points in the video. In reality the half shafts in the scenario portrayed (rounding a bend) are rotating in the same direction, just one is rotating slower than the other.

(edit: a few seconds before it appears one half shaft goes backwards - you can see that the helical gear sets were rolling with the diff case, and both half shafts going in the same direction. They then slow the casing rotation so you can see the helical gears better....and then one of the half shafts appears to be going backwards. Its a purely relative POV thing...)

I suppose there could be situations in which they might rotate in opposite directions, such as very sharp turns or if one wheel spins.