andyd
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| posted on 15/5/08 at 10:59 PM |
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Making a chain driven diff
Ok, so I've done some searching and found posts about bolting a spocket in place of the crown/ring gear/wheel and possibly encasing it or
leaving it open but.....
Can someone explain how these work as a diff as opposed to being fixed? i.e. both wheels turning with the same force.
From the examples I've found I can't see a planetary gear. Can someone explain it to me or point me at an idiots guide of some sort? 
I really like to take a Sierra diff, pull it apart, bolt a sprocket on and whack it in so what would I keep and what would I disgard?
My limited diff knowledge is being led by this Wikipedia image...
Andy
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Trems
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| posted on 15/5/08 at 11:20 PM |
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I may be interpreting your description incorrectly but it sounds like you will be using the diff exactly as it was intended except rather than the
crownwheel driving a perpendicular, tapered gear to the prop it will simply drive the chain directly...this still having the full differential
functionality?
All i would say is do your sums when deciding what sized sprocket to put on otherwise you may end up with a very strange diff ratio!
In a nutshell all you'd need to do is remove the gear that the prop connects to (not in pic) and modify the crownwheel.
[Edited on 15/5/2008 by Trems]
[Edited on 15/5/2008 by Trems]
www.tR3M5.com
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trikerneil
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| posted on 16/5/08 at 05:33 AM |
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Have a look HERE and HERE for some
ideas.
HTH
Neil
ACE Cafe - Just say No.
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russbost
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| posted on 16/5/08 at 08:17 AM |
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You simply remove the crownwheel & replace with a bike sprocket, the rest of the diff stays in place & connects to driveshafts as usual - I
think there is/are some pics in my archive.
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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andyd
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| posted on 16/5/08 at 02:16 PM |
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Ok so I get it now... I was missing the fabricated housing most have around the other gears.
So as per the borrowed photo below, it's a case of...
pull a Sierra diff apart
make some bearing holders (blue bits in pic)
make a gear housing to contain lubricant (shiny silver tube in pic)
make up "sides" plus any supports etc
assemble
 
Chain driven diff
Sounds easy... not. 
[Edited on 16/5/2008 by andyd]
Andy
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Davey D
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| posted on 16/5/08 at 03:37 PM |
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you could always do it like on a kart, and have a solid rear axle, with a sprocket on it
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andyd
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| posted on 16/5/08 at 03:40 PM |
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quote:
Originally posted by Davey D
you could always do it like on a kart, and have a solid rear axle, with a sprocket on it
A bit hairy on the corners though eh? Nice for hanging the back end out though... and what about the old "on two wheels" stunt? 
Andy
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MakeEverything
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| posted on 22/7/08 at 06:09 PM |
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Hi, This is exactly the problem i see. How do you stop the chain from jumping off of the sprocket? If mounteed in the back of the car (as i plan)
then the diff will be lower than the engine, so when you hit a bump, the chain falls off??
I thought about a solid axle, but with good old uk roads, im a bit concerned about vibration and chassis fractures from speed bumps etc.
Hanging the arse out, and being a bit of a handful isnt really a worry, just the losing power or breaking down bit...
How are you gettin on with yours?
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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andyd
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| posted on 23/7/08 at 07:38 AM |
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I'm "on hold" at the moment due to "life" getting in the way.
To discuss one of your fears though...
My engine will be hard mounted as will my diff so once the correct distance is set to get the required chain tension it'd be nearly impossible
to get the chain to jump off. I say impossible... I'm sure someone has made it happen but I doubt that's "normal road
conditions".
Andy
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MakeEverything
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| posted on 23/7/08 at 07:44 AM |
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I see, though "Normal Road Conditions" where i live are normally Shocking to start with!!!!
I see how i could fix the diff, if going for IRS, but i was thinking of a "Go Kart" axle... What a laugh that would be!! My fears are
that the vibraion would damage the chassis, or make stuff fall off!!
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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