CNC made aluminum Uniball rear suspension system

[randyj]

Alex,

Have you already made a set of those? I thought that I had seen those before but could not find the post. I guess you cant use the uni-ball system and still retain the torsion bar. I would like to keep mine and just have some helper coilovers like they use on the 944.

Randy

[-Alex-]

Sorry, i havent made these yet. Having hard time to find strong M20 uniball here in finland, Fluro or Hirschmann i would prefer. Each cost about 60-75 euros each, yikes!


Also found that SKF makes these too, should be strong enough, static 51KN and dynamic 31KN. Our use is 80-90% static.

http://www.skf.com/skf/productcatalo...odid=208400017

[-Alex-]

More info about my design and its strength. Small bolt holes are 10,5mm and bolt holding uniball is 20, so there is very little "slop". Actually there is M20 thread on the inner part.

I did few strenght tests with solidworks simulation tool, using 6082 T6 material.

I have chosen Hirschmann M20 joint, which can stand 4500kg static load and 9000kg dynamic load.


Small bolt holes were used to "fix" the part and "force" from uniball bolt hole. Force is 2000kg per on 20mm hole, force direction to the back.

Inner part factor of safety is 3,5 and outer part factor of safety is over 5. Putting these two parts together should make a strong housing for uniball joint.

[beetle1303]

Hey Alex,nice model... I'm using SolidWorks as well (10 years know).
I would like to see the stress and strain charts, max values etc and deformation as well...
What factor of safety are you using?
Do you need some calculations for input forces suspension dynamics, braking etc?? if so pm me

Chris

[-Alex-]

Hello, i have been using solidworks about 6 years. I found few litlle weak spots from the bracket, so i redesigned it.








I am not using any preferred factor of safety, but bigger i get, better it will be. All tests have been done with 20000N=2000kg force. I tried also different directions the with same force on these uniball housings per part, i am getting 2 or higher factor of safety

I could try get the stress, strain and deformation charts. Bracket will be made still from S355 steel, but i would prefer Optim 500 highstrength steel, which also you can get up to 60mm thicknesses, the best material would be 7075 aluminum, but it would rise the price of this kit.