alistairolsen
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| posted on 18/5/10 at 12:51 PM |
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3 link axle setup, attaching mount to diff housing.....
Ok, so I have an axle setup on a car which lends itself to a 3 link setup......
The lower links will be parallel to the ground at ride height using the lower half of locost style axle brackets, and the original spring hangers.
I had considered the upper links on a 4 link setup but theyre going to be hard to package so I wondered about a 3 link setup, but Im unsure how to
attach the top arm to the diff.
At full compression the housing is VERY close to a crossmember above it but there is plenty of room forward of this.
Anyone got any thoughts or experience?
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alistairolsen
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| posted on 18/5/10 at 01:21 PM |
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Found some better pics....
Looking at something like this:
The length of the bottom links is largely fixed, but the top a frame can be as long as needs be.
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alistairolsen
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| posted on 18/5/10 at 01:36 PM |
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Still thinking aloud (and now talking to myself, would there be any adverse effect if I were to use a conventional axle bracket on the axle tube just
to one side of the diff housing, and make the A frame a right angled triangle?
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nick205
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| posted on 18/5/10 at 01:56 PM |
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Have you looked at fitting the upper link/triangle the other way round as Dax do on the Rush rear end....
Might be easier than trying to attach a pivot to the diff casing as you could use more standard Locost axle brackets and pick-up on the top of
them.
If you had some form of sliding link to account for the change in length, you could even run the triangle top link to the rear of the chassis as well.
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alistairolsen
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| posted on 18/5/10 at 01:58 PM |
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Yeah I looked at that but the layout of the chassis rails lends itself to doing it this way round, much like on landrover defenders.
The change in length would just result in the axle rotating a little if the arms were nice and long, but theres not a great deal of structure back
there in the chassis so Id rather go forwards if possible.
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SPYDER
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| posted on 18/5/10 at 02:42 PM |
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Hi Alastair.
We used a vaguely similar arrangement on a TR7 V8 circuit racer.
We had two parallel arms ABOVE the axle which went backwards and ended up in the boot.
We then had an "a frame" attached to the bottom of the diff casing which went forwards.
Viewed from the side the two were equally disposed above and below the axle centre line and were equal in effective length.
The attachment point on the bottom of the diff becomes the rear roll centre ( although some may argue).
This system worked very well. We won three national championships with the TR7 and motoring journo Jeremy Walton said it was one of the best handling
cars he had driven.
Your arrangement would put the rear roll centre quite high which may not be a good thing.
Lotus Cortinas used an "a frame" arrangement below the axle.
Geoff.
[Edited on 18/5/10 by SPYDER]
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alistairolsen
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| posted on 18/5/10 at 03:05 PM |
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Sound interesting, essentially a Satchell link, but in an odd layout.
Id like to keep it all forwards due to the chassis at the rear being two straight bits of box section and nothing else worthwhile 
The issue is packaging long upper trailing arms given where the crossmember spans the rollbar mounts which is why I was looking at an A frame. If its
not going to work though then Im back to a short 4 bar setup with a panhard rod like the locost.
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zilspeed
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| posted on 18/5/10 at 05:08 PM |
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My Sylva has this setup.
Two lower trailing arms as normal.
The two upper trailing arms form an A shape with the diff housing having pickups cast into it to provide the pickups.
I'll go and take some pics of the axle.
[Edited on 18/5/10 by zilspeed]
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Canada EH!
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| posted on 18/5/10 at 05:54 PM |
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Nascar setup, two long trailing arms from transmission crossmember as close to the centre of the car as possible then to were spring perch now is and
panhard rod. Used on GM pickup trucks in the 60's, that's why they call them "truck arms".
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