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Rear axle drive

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Old Sep 5th, 2019, 00:58   #1
Backhill1
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Default Rear axle drive

Being very familiar with the vw/audi haldex system i was shocked to find out the rear axle drive (via haldex diff) is driven from an angle drive from fwd differential to the off side front wheel.
So in effect if your OSF wheel isn't turning nothing can go to your back wheels.

Once you know this the 4 motion system is great and with some counter intuitive spirited driving you will always get going in normal uk Conditions.

How is drive on the volvo system transmitted to the back?

Is it an independent output from the diff that always drives or basically a box fitted on the front drive shaft sending drive back?

I suspect the same as other euro boxes the latter as the cheapest and easiest system just useful to know in the winter you need to get the os front wheel spinning.

Btw this is how the utube videos make subaru or any system with a torson diff look good and haldex poor. When in real life both work very well.
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Old Sep 30th, 2019, 11:58   #2
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[duplicate post]
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Old Sep 30th, 2019, 12:13   #3
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The angle drive on the Aisin Warner (auto) and Volvo (manual) gearboxes are driven from the front differential crown as they are on the VW implementation - do not be confused by that O/S/F driveshaft passing through the transfer box because it does just that - passes through.

There is no mechanical layout difference between the haldex installation between Volvo and VAG, there are some software changes and I think Volvo has the better software.

If you look at this picture you can see the splined sleeve drive into the transfer box (bevel gear) as well as the splines on the driveshaft (it's from the latest Passat Alltrack).

If you're interested in this sort of stuff then you might find this interesting if you've not seen it before:

https://www.youtube.com/watch?v=dtx6w_WqVNs

There's loads of vids like this on Youtube... including a group test with about 20 cars.

The biggest factor in how good a AWD system is in snow and mud is how good and well maintained your rear brakes are...
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Last edited by Tannaton; Sep 30th, 2019 at 12:28.
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