Quarter Elliptical Tech

[BrettM]

I think this is brilliant

here's a closeup of his shackle, definitley the way to go to prevent spring twist.

 

[JeepFreak21]

I think this is brilliant

 

[xjj33p3r]

I think this is brilliant

here's a closeup of his shackle, definitley the way to go to prevent spring twist.

The mechanics of the picture alone is astounding. :repair:

 

[CRASH]

That's one of our old members!

Same idea as the jack screw, except with on the fly adjustability. You could make that work without going into the cab, if you had a very short hydro cylinder.

I like the overload spring idea the most.

 

[BrettM]

what about just a normal 1/4 eliptical setup, and a single center mounted airbag for heavy loads?

 

[CRASH]

Yeah, thought about that too. Don't you think it would do weird things to the roll stability? Seems like you'd end up pivoting around the center bag.......

All this is moot until I get a real axle to build onto. The 8.8 is not worth the axle brackets I would have to make for it.

 

[BIGWOODY]

BIGWOODY,
When you say it hinges, do you mean like this? Got any pics of the hinging action?

Billy

Yes, but I'm not sure if I have any pics of it in action I'll have to look. It would unseat only in the most extreme situations. But having bushings on both ends realy helped with the twisting effect.

 

[BrettM]

Yeah, thought about that too. Don't you think it would do weird things to the roll stability? Seems like you'd end up pivoting around the center bag.......

All this is moot until I get a real axle to build onto. The 8.8 is not worth the axle brackets I would have to make for it.

Certainly that could be an issue, but I suppose it would depend a lot on how much sag it was counteracting, and if you have a swaybar. I would give a total random-ass-guess that if it's only taking up 2 inches of sag and you were running some sort of swaybar you wouldn't even notice...

 

[Weasel]

what about just a normal 1/4 eliptical setup, and a single center mounted airbag for heavy loads?

Where would the air bag go? Having a hard time picturing this?

 

[BrettM]

Where would the air bag go? Having a hard time picturing this?

right on top of the diff

 

[Weasel]

well if you do that I would think you effectivly eliminated what the links are suppost to do.

 

[Roxtar]

Don't see the point in that.
Wouldn't it just be a center bumpstop?

 

[Goatman]

Don't see the point in that.
Wouldn't it just be a center bumpstop?

Brad, remember the comment comes from someone who's running front leaves and rear coils.........on a rig that started with front coils and rear leaves.

He's a little confused.

 

[Jeff 98XJ WI]

Don't see the point in that.
Wouldn't it just be a center bumpstop?

If one made a 4 link rear with 1/4 elliptic springs and added a center air bag, I can see where it would help support extra weight in the rear of the rig without having to crank up the spring rate on the 1/4 elliptic springs. Seems like it would work fine. During normal driving, the 1/4 elliptics do the job of supporting yet when extra weight handling is needed, add a little air to the bag. No different than a motorhome with overload air bags. Jeff

 

[Lincoln]

If one made a 4 link rear with 1/4 elliptic springs and added a center air bag, I can see where it would help support extra weight in the rear of the rig without having to crank up the spring rate on the 1/4 elliptic springs. Seems like it would work fine. During normal driving, the 1/4 elliptics do the job of supporting yet when extra weight handling is needed, add a little air to the bag. No different than a motorhome with overload air bags. Jeff

I played around with that a little 5 or 6 years ago. The difference is where the weight is supported. Adding weight above it causes the center of gravity to raise and only increasing the support in the middle causes it to get to get pretty tippy.

As a test you can add a bunch of weight in the back to get about 1" sag, then use a jack under the hitch in the middle to take that sag back out. Then push on the body to see how easy it wobbles back and forth. Putting the bags out on the ends of the axle decreases that effect dramatically.

 

[BrettM]

Brad, remember the comment comes from someone who's running front leaves and rear coils.........on a rig that started with front coils and rear leaves.

He's a little confused.

It's all a blank canvas

 

[Weasel]

with the overload bags arn' they on the top side of the spring? Unless I'm understanding this wrong, or is the bag mounted on top of the link and between the body? Similar to Jason Paule's old setup on the rear of his buggy.

 

[Roxtar]

Brad, remember the comment comes from someone who's running front leaves and rear coils.........on a rig that started with front coils and rear leaves.

He's a little confused.

But he can now back through stuff we can only dream of.

 

[CRASH]

I played around with that a little 5 or 6 years ago. The difference is where the weight is supported. Adding weight above it causes the center of gravity to raise and only increasing the support in the middle causes it to get to get pretty tippy.

As a test you can add a bunch of weight in the back to get about 1" sag, then use a jack under the hitch in the middle to take that sag back out. Then push on the body to see how easy it wobbles back and forth. Putting the bags out on the ends of the axle decreases that effect dramatically.

OMG, someone make a note.

Lincoln understood the tech in a thread and even added a valuable analogy.

Perhaps there is hope for mankind after all!

 

[Roxtar]

OMG, someone make a note.

Lincoln understood the tech in a thread and even added a valuable analogy.

Perhaps there is hope for mankind after all!

I know I was impressed.