fantic238

Hi everybody, this is my latest invention.
I wanted to eliminate the lateral movement of the front axle due to the

northline76

While I feel that it is a good idea, it really would only be good for a jeepspeed pre runner sort of cherokee. I think that it would be ineffective offroad.

I can see it getting pretty mangled in several offroad situations. Rocks could easily eat the pistons and destroy the oil lines. I dont think it would also do well if submerged in mud or muck.

4.3L XJ

The reason the XJ system is like it is is to eliminate bump steer, a common thing in the early 4X4s. If you eliminate the track bar, you should also eliminate the drag link and go to full hydraulic steering. Another thing you have not accounted for is the change in volume caused by the presence of the rod on the cylinder.

BuckB91XJ

Yeah, dude. your invention may be good for off road only but I believe it would be ineffective while at highway speed on the road.

ol"blue

Looks good in theory. The WJ uses a 3-link set-up in the rear with no track bar.

fantic238

Yes i know of the volume of the rod in the cilinder, it'll work if i use 4 cilinders instead of two, this was just a sketch i made this morning after i had the idea. I think that the XJ like many other 4x4 are equipped with a Panhard bar because it's cheap and simple.

fantic238

Why?

fantic238

This kind of pistons are mainly used in small excavators for the bucket swing, it's a little bigger than a shock absorber and the oil lines are similiar to the brake lines, all stuff u have under your jeep and don't break that often, i think it will do it.

ktmracer419

would need full hydro steering

i would never run that at speed

a failure in the "trackbar" or steering would basically mean death.

i'll keep my trackbar thx

EndlessMtnFab

Almost reminds me of a Watts linkage.


My vote goes for "won't work as designed"


The fluid is going to move/circulate, leak. etc.


And it's not really acting as a pivot (because you're going to have one rod behind the other)... so I think it's likely to bind at some point thru the range of motion. Also .. if you're cresting a berm .. the suspension will drop straight down ... how is the fluid going to handle that? I would think it would almost want to "suck" the rods/shafts back in.




Joe

a1racer

its good in theory but in real life i think it would be a horrific failure at high speeds and on wash board type of stuff where you need quick suspension cycling ability i think this would limit that and cause a harsh ride at speed. but if perfected could work very good as long as the steering was hydro

fantic238

Hmmm...
Ok let me specify that it only replaces the track bar not the whole suspension.
I have not drawed shocks, U and L CA, and steering.
It will probably have a damping effect in it's movement, i don't know if this is good or not.
The watts linkage is non linear at the end, this is fully linear, i can put one rod beside the other one and it will work just like a multilink suspesion.
The only thing that does not convince me is the fact that i'm dealing with fluids, the mechanical packings that come with this pistons are notorious to be poor in quality.
I'll reason it more and update.

muddeprived

I think your invention was already invented. It's called triangulating the upper links so you eliminate the trackbar. No need to fiddle with hydraulics and go through all that work.






I've used this setup when building RC's. It works flawlessly and lessens the work load cuz I don't have to work on getting the trackbar and draglink parallel. Flexes like mad too.

fantic238

I have found some interesting theory on long and short control arms, i want to understand which the best geometry is for off road use and articulation.
Have a look:
http://en.wikipedia.org/wiki/Four_bar_linkage

fantic238

It's something totally different. The triangular upper link goes towards the rear (towards the front in rear suspension like the Suzuki sidekick and the wj) and serves also as UCA, if you look at my pistons from a vertical view, they would appear parallel to the axle, like the Panhard.