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markymoan
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 Posted: Mon Feb 05, 2007 22:43 Post subject: |
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| Posted: Mon Feb 05, 2007 22:43 Post subject: Google Ads keep this community free to join! |
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Hard1
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| Posted: Mon Feb 05, 2007 22:46 Post subject: |
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No no, only women answer questions with questions.  Are the questions all mad? Can you answer any of them for me?
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Peej
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Hard1
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| Posted: Mon Feb 05, 2007 23:08 Post subject: |
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Yeah I get that bit but good explanation thanks. I used to run a Detroit Locker so I'm not totally unfamiliar with the genre.
It's the bit up front I'm not sure off. I'm not an off roader at all as I bought mine to town this 3 ton thing with.....
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markymoan
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| Posted: Mon Feb 05, 2007 23:27 Post subject: |
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Looks like it goes off road to me 
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Hard1
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| Posted: Tue Feb 06, 2007 0:40 Post subject: |
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:::Matski:::
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Joined: 27 Dec 2005
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Location: York
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| Posted: Tue Feb 06, 2007 11:04 Post subject: |
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| Hard1 wrote: |
Yes I would like to fully understand this process too.
Let's start with the basics and work up to SOTF etc.
LSD Diff. When one wheel spins applies power to other wheel. Not a locker, so can go around corners on road with no problems but, will not necessarily drive both rear wheels equally in an off road situation. True or false?
I think true
No centre diff needed as front and rear axles (shafts) are normally disengaged enabling road travel.
True
When 4X4 engaged the front (auto)hubs somehow lock the axles to the wheels? Is this right? Done via solenoids or what?
Correct, on earlier models it is purely mechanical
The back axles are already "locked" under power presumably (LSD) and so the 4WD control only works on front? Is this right? The front diff is "open" though not locked.
When you select 4WD you are engaging the front axle at the transfer case. Front and rear prop shafts now turn at the same speed
So we now have the 2 rears driven and the 2 front driven but I am not understanding the front axle which will still work as a differential (if it isn't locked in some way), therefore this is not true 4WD, back or front.
LSD aside in 4WD you have drive to the front and rear axles. If you have no traction on one wheel all drive on that axle will go to that side.
So if you have one wheel on the front in the air and one wheel at the back in the air you have no drive. The LSD goes some way to correcting this, but I don't know how far.
In the case of a landrover, if you don't engage the center diff and have one wheel in the air, all the drive can go to that wheel. If you engage the center diff, it is the same as a trooper.
If you want pukka 4WD you need locking diffs. Is this correct?
Now, what happens with manual hubs when you leave them locked out but enagage 4WD? Anything?
If the manual hubs are not locked when engaging 4WD then you still have 2WD, as the front drive shaft will be turning the diff and half shafts, but the wheels will not be connected.
Answers on a postcard please. |
This is my understanding, but I don't know how the LSD works. Is it a clutch type, or a mechanical type? And how much more power can it send to one wheel over the other?
If it is a clutch type the clutch can be overcome as in the cornering. |
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marcusj
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| Posted: Tue Feb 06, 2007 13:15 Post subject: |
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yep thats about right they usally work via a clutch pack assembley, they are set at a pre determined load of slip(the plates) dependant on power, this will allow the power to change when there is not enough power going to one wheel, thus you get a ballance of power i.e a power slide, it stops the car from snapping back on you, you will get messured amount of drive(spin) in one wheel before the lsd comes in and transfers some of the power to the other wheel as well.also you can get a torsion diff (also known as a centre diff)that will devide power between front and rear axles if there is a lsd in both axles this will devide power from corner to corner of the car .
god hope that makes sense 
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marcusj
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| Posted: Tue Feb 06, 2007 13:21 Post subject: |
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or this is what i ment to say By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels  anyone got a spade so i can keep digging
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Chris B
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| Posted: Tue Feb 06, 2007 13:26 Post subject: |
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That probably explains why my current motor does a nice controlled power slide on slippy roundabouts and the last one would give a sudden and rather violent "slip" to the side. (current motor has an LSD)
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markymoan
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Joined: 25 Jun 2005
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Location: Naughty Step
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| Posted: Tue Feb 06, 2007 13:26 Post subject: |
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So its a magic box then, thats good enough for me 
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TimBanham
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| Posted: Tue Feb 06, 2007 13:28 Post subject: |
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| Chris Beesley wrote: |
| That probably explains why my current motor does a nice controlled power slide on slippy roundabouts and the last one would give a sudden and rather violent "slip" to the side. (current motor has an LSD) |
Yeah but it scares the b*ll**s out of anyone near yout when you power slide a 2000KG beast 
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marcusj
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| Posted: Tue Feb 06, 2007 13:29 Post subject: |
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nicely put chris yep thats it sort of
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Chris B
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| Posted: Tue Feb 06, 2007 13:29 Post subject: |
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| TimBanham wrote: |
| Yeah but it scares the b*ll**s out of anyone near yout when you power slide a 2000KG beast |
Normally the wallet when I remember how much the BFG AT's cost
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