Thread: hair-brain half-baked idea coming right up

Well... It certainly gets complicated going this way. And much wider than using 3 (or 4) gears in line.







The outside diameter of the annulus is 210mm with 90 teeth, the planetarys have 20 teeth.

A very similar discussion happened on another LR forum. Worth a read, many of the same ideas plus a few more good ones. It seems some people have been successful in making bolt on portals at home.

bespoke portal drop boxes/axles - LR4x4 - The Land Rover Forum

I just rememberd that F100, F250 and F350 transfer cases (I dont know what make probably Borg Warner being ford) ran chain drive.

So in that case if you could get that style of chain and having 1 on each corner then it should work and be quite reliable.

I have managed to break some links in one of those transfer cases with my old F350 but I had 5 tonnes of goose neck trailer on the back and skipping it into position in 4wd low and it didnt take it all that well.

But it did last a fair while before it crapped itself.

Im going to have a bit more of a look into it and see if I can chase up some pics of the inside of one of these cases and to see if it would be feasable.

Originally Posted by mcrover

I just rememberd that F100, F250 and F350 transfer cases (I dont know what make probably Borg Warner being ford) ran chain drive.

So in that case if you could get that style of chain and having 1 on each corner then it should work and be quite reliable.

I have managed to break some links in one of those transfer cases with my old F350 but I had 5 tonnes of goose neck trailer on the back and skipping it into position in 4wd low and it didnt take it all that well.

But it did last a fair while before it crapped itself.

Im going to have a bit more of a look into it and see if I can chase up some pics of the inside of one of these cases and to see if it would be feasable.

To compare with portal boxes you would have to multiply the torque by the diff ratio and divide by the number of wheels (provided there are no diff locks!), which would come out about the same, but if there are diff locks all round the (maximum) torque would be the torque at the transfer case multiplied by whatever the diff ratio is. So on the face of it, it should work.

But can you use sprockets as large as those in the transfer case? The load on the chin is inversely proportional to the sprocket diameter.

John

my money so far is on this, its simple, strong and compact.

Originally Posted by defmec

get the design of mal story ,go to china get a heap made .mals original design was a very simple and strong design having 4 straight cut gears

the design was good but the CV let them down, it used the early RR 606660? one, we have used one of our HD CV's, cut the stub off and spark eroded the 10 spline in the bell to make a HD version of this for a few customers,

Dave