smart51
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| posted on 15/6/05 at 06:23 PM |
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Limited Slip part of a Sierra diff
I removed the back plate of my diff today to clean out the swarf from where I accidentaly cut a hole in it. I was pleased to see that there was no
real wear on any of the gears.
Afterwards, I thought about the limited slip part of the diff and how I hadn't noticed it.
Where is it and what does it look like?
I cleaned out the 4 gears in the planet carrier and the big crown wheel, so where's the limited slip bit?
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mookaloid
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| posted on 15/6/05 at 08:33 PM |
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The crown wheel is bolted to it,
Cheers
Mark
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smart51
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| posted on 15/6/05 at 09:03 PM |
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Ah, the big black thing. How does it limit the slip? I managed to make it slip by hand quite easily, so that I could get to all the teeth on the
"diff".
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dnmalc
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| posted on 15/6/05 at 09:06 PM |
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I believe its a viscous coupling ie it will have low resistance to slow movement but resists fast movement
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dnmalc
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| posted on 15/6/05 at 09:06 PM |
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its a viscous coupling ie it will have low resistance to slow movement but resists fast movement
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smart51
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| posted on 15/6/05 at 09:10 PM |
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OK. how is it connected to each output?
The crown wheel is bolted to the planet carrier which has 2 small beveled gears fixed to it an small shafts. the 2 larger output beveled gears mesh
with the smaller beveled gears and drive the wheels.
How does the viscous coupling fit in?
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big_wasa
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| posted on 15/6/05 at 09:23 PM |
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I may be wrong and often are BUT if its lsd Then I didnt think that you could see/touch the planet gears .ie that sounds like an open
dif?????????????
The link below shows an rs2 lsd on ebay .does it look anything like that?
LSD link
Or can you see the planet gears like in the link below
open diff
?????????????????????????????//
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liam.mccaffrey
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| posted on 15/6/05 at 10:27 PM |
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a viscous lsd is just like a normal diff but with the addition of a viscous clutch consisting of plates very close to each other with a special fluid
in between which when the plates turn at different speeds ie when a diff is fully slipping, change viscosity with the friction generated between the
p[lates. this then turns the slower wheel transfering torque to the slow grippy wheel
i think
Build Blog
Build Photo Album
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chriscook
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| posted on 15/6/05 at 10:37 PM |
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The standard ford LSD (viscous as described above) looks like the attached picture - its hidden inside the bit to the left of the crown wheel.
-identifiable because its thinker than the standard open diff.
Chris
 
Rescued attachment dscf0044_small.jpg
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smart51
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| posted on 16/6/05 at 07:19 AM |
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It's funny, just looking at that picture I can smell gearbox oil. That is what my diff looked like inside. I just expected to see something
that linked the two output shafts in some way.
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Bob C
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| posted on 16/6/05 at 11:24 AM |
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It doesn't have to link the 2 o/p shafts; the crownwheel is doing the average speed of the 2 shafts so it's equivalent - and MUCH
mechanically simpler - to put the slippy bit between the crownwheel and one output shaft.
cheers
Bob
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big_wasa
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| posted on 16/6/05 at 09:59 PM |
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 You learn sumet new every day
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Liam
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| posted on 24/6/05 at 01:39 PM |
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quote:
Originally posted by smart51
Ah, the big black thing. How does it limit the slip? I managed to make it slip by hand quite easily, so that I could get to all the teeth on the
"diff".
The reason for that is that without the left shaft/flange plugged in, the left output isn't connected to the viscous coupling, so you can move
the spider gears around as easy as an open diff. Plug the left shaft/flange in and this should be pretty impossible by hand.
liam
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smart51
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| posted on 24/6/05 at 05:34 PM |
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My diff has bolt on shafts not plug in ones so it should work fine. My guess is that at the speed at which I was turning the shafts, the viscous
coupling wasn't doing much, as if the car were going round an ordinary corner.
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