mogman1969
|
| posted on 1/11/10 at 08:07 AM |
|
|
reinventing the wheel mumber 65037.....
lust wondered if any one knows why when using 4 link suspention , the arms are not used in triangular form , pivoting at the normal locost mounts then
fixed at a near 45 degree angle to finish on a mount near the diff ........one wouldnt need a panhard rod then , bearing in mind that no more that
100bhp is likely to be available
|
|
|
|
|
snapper
|
| posted on 1/11/10 at 08:20 AM |
|
|
Early Lotus 7 and Lotus Cortina had an A frame link to the diff and 2 trailing arms.
It does concentrate a lot of force at 1 single point
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
|
|
|
SPYDER
|
| posted on 1/11/10 at 08:34 AM |
|
|
Many cars have used such diagonal location arms, although usually just the top pair in conjunction with a parallel lower pair.
The TR7 being just one.
The geometry is compromised in ways that I do not begin to understand. It can be OK for a road car with it's usually soft set-up but is seldom
seen on more performance focussed cars. AFAIK.
Now replacing one pair of trailing arms with a triangular frame that mounts directly to the diff centreline, ie. an " A-frame" is a
different matter and can be the heart of a very precise setup as previously posted.
Both of these arrangements would be difficult to incorporate into the Locost I fear. The angled arms would encroach into the cockpit space.
One solution might be to keep the upper pair of arms as per usual then have a rearward A-frame apexing under the diff and pivoting from two mounts on
the rear chassis rail under the fuel tank area.
It would compromise ground clearance but could be OK on a track oriented car.
This arrangement would be essentially the same as featured on our 3 times championship winning TR7V8, albeit turned back to front.
Geoff.
|
|
|
mogman1969
|
| posted on 1/11/10 at 08:35 AM |
|
|
not an A frame just a suitably robust bracket either side of the diff to take upper and lower trailing arms
|
|
|
daviep
|
| posted on 1/11/10 at 08:50 AM |
|
|
Where does the 100hp limit come from?
“A truly great library contains something in it to offend everyone.”
|
|
|
mogman1969
|
| posted on 1/11/10 at 08:57 AM |
|
|
1275 a series engine ....if i get it tuned ya not looking at that much ......
|
|
|
mogman1969
|
| posted on 1/11/10 at 08:57 AM |
|
|
1275 a series engine ....if i get it tuned ya not looking at that much ......
|
|
|
daviep
|
| posted on 1/11/10 at 09:03 AM |
|
|
Sorry thought we were discussing design in general.
Cheers
Davie
“A truly great library contains something in it to offend everyone.”
|
|
|
mogman1969
|
| posted on 1/11/10 at 09:08 AM |
|
|
my only thought was the more bhp going thru the assembly the more chance of trouble
so thought it had a bearing 
|
|
|
ken555
|
| posted on 1/11/10 at 09:10 AM |
|
|
quote:
Originally posted by mogman1969
1275 a series engine ....if i get it tuned ya not looking at that much ......
The original Cox GTM had this arrangement.
|
|
|
mogman1969
|
| posted on 1/11/10 at 09:20 AM |
|
|
cox gtm ....mini based fwd with irs wasnt it ? looking at a solid axle here .....
|
|
|
MikeRJ
|
| posted on 1/11/10 at 10:04 AM |
|
|
quote:
Originally posted by mogman1969
lust wondered if any one knows why when using 4 link suspention , the arms are not used in triangular form , pivoting at the normal locost mounts then
fixed at a near 45 degree angle to finish on a mount near the diff ........one wouldnt need a panhard rod then , bearing in mind that no more that
100bhp is likely to be available
You would only be able to triangulate one of the four arms; any more than this and the system would bind up. It's something I thought about
when I was making the rear end on my chassis, but then again a panhard rod isn't exactly a complex thing to make.
|
|
|
mogman1969
|
| posted on 1/11/10 at 04:50 PM |
|
|
ahhhhh so it would bind ..... ok ...option two , A frame time now wheres that drawin gone
|
|
|
Minicooper
|
| posted on 1/11/10 at 04:56 PM |
|
|
I looked at the satchel link setup which appears well thought of in America, but since I didn't have a clue what would work, I stuck with a
watts linkage in my case.
The linkage has two diagonals and doesn't seem to bind otherwise it wouldn't work would it?
Cheers
David
|
|
|
mark chandler
|
| posted on 1/11/10 at 05:54 PM |
|
|
Classic range rover, cortina etc, lots of cars out there with linkage like that.
Range rover has ball joint on chassis with A legs on top of axle so opposite to most designs that are wider on the frame, close on the axle.
|
|
|
mogman1969
|
| posted on 2/11/10 at 01:57 AM |
|
|
satchel link ....thats a new one on me ....wiki time .....
|
|
|
