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D2 - Transmission Gearboxes, diffs, drive shafts.

 
 
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Old 1st December 2019, 05:25 PM
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moltuae moltuae is offline
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Quote:
Originally Posted by MikkiJayne View Post
Because turning the wheels in opposite directions will result in zero rotation of the output shaft of the diff. Turning the wheels in the same direction results in the output of the diff turning. With Torsen it makes no difference as the geared centre diff will just be driven by one axle instead of the engine. No big deal for a short time. Something with a viscous centre diff (Subaru?) would probably also be fine.

Think of a TT though, where the rear wheels are directly coupled to the front wheels by way of a clutch pack, or indeed a Land Rover where they are directly coupled by the transfer box. If you turn one axle forwards the output from that diff must turn the other axle forwards. If that other axle is on the ground something has to give. In a TT the clutch pack breaks - what happened to my MoT guy. I expect a Landy would either drive off the rollers, stall them, or just lose traction.
Thanks for the explanation

I get how having the wheels of one axle on the ground (while the other axle is turning) might be bad for some AWD systems. But I thought we were saying that the axles should (ideally) be turning in opposite directions? That I don't get. I mean, if all 4 wheels are turning in the same direction, is that not the same as the vehicle coasting along the road? Or are we talking about protecting the gearbox here? I can see how opposing rotations might cancel out at the diff, preventing rotational forces from transferring to the gearbox.
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