And now for something completely different(ial)

"RamblinRover Luxury-Yacht" (ramblininexile) 06/04/2014 at 14:51 • Filed to: None

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Allard version of the Halibrand quick-change - in cutaway. !!!error: Indecipherable SUB-paragraph formatting!!! .

!!! UNKNOWN CONTENT TYPE !!!

Racescort666 > RamblinRover Luxury-Yacht 06/04/2014 at 15:08

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How exactly does the positrac rear end on a Plymouth work? It just does.

RamblinRover Luxury-Yacht > Racescort666 06/04/2014 at 15:11

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I thought that seemed like a reference - I need to rewatch Joe Dirt, as I didn't remember that at all. Bait not taken, though the Googles indicate some on Yahoo Answers fell for it.

OkCars- 22k Crossroads > RamblinRover Luxury-Yacht 06/04/2014 at 15:24

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Since you know your way in differentials, could you get me a picture of how does a 2 axle truck works?

Nibbles > OkCars- 22k Crossroads 06/04/2014 at 15:55

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Warning: HUEG PIC

RamblinRover Luxury-Yacht > OkCars- 22k Crossroads 06/04/2014 at 15:57

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I assume you mean twin rear axle/6x6 truck, correct? There are a couple of different ways. One way, the old style, is to handle both completely separately like so:

It can also be done with offset drive and a driveshaft going over the top.

Or, with a pass-around setup:

Or, it can be done with a transfer case mounted to the second axle.

Or, it can be done via two pinion gears, two crown gears, and great confusion, as in a Pinzgauer:

Finally, it can be done as with a Dutch, I think, 6x6 in that there is a drive link down each side, driving each side's wheels all together from one side of a diff, and the other side's wheels all together from another. A similar setup is seen on 6x6 ATVs, which typically have rearmost wheels chained to the middle axle.

FJ80WaitinForaLSV8 > RamblinRover Luxury-Yacht 06/04/2014 at 16:23

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Not sure I followed that all 100% So most over the road semis run the Man setup you showed above correct? That is the second drive shaft simply runs between the two rear drive axles.

RamblinRover Luxury-Yacht > FJ80WaitinForaLSV8 06/04/2014 at 16:31

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Similar, yes, but I don't know about "most". Many, but not all. Quite a few use a "bogey" axle that's undriven. Compare and contrast:

FJ80WaitinForaLSV8 > RamblinRover Luxury-Yacht 06/04/2014 at 16:34

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My understanding is that bogey axles are much more common in europe than in the US. Hardly any of the long haul guys use Bogeys as they often deal with snow and fuel is less expensive here. The EPA is trying to push up adoption of Bogeys though with their new fuel economy rules.

RamblinRover Luxury-Yacht > FJ80WaitinForaLSV8 06/04/2014 at 16:38

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I'd imagine about 0.1% of the Aussie long-haulers on super singles use bogeys. Roads are too bad, loads are too high, and life's too short to get stick in the middle of nowhere.

You do get inherent drivetrain losses with any kind of gear-based offset drive, so over-the-top worm drives would seem better... except that stepping the pinion that far off center has its own losses.