Hello people,

I am thinking off building a second Actros, but this time a container system with cable winches.

It will be a 8x2 with a liftable 4th axle, this is where I want a bogie system to lift it, like in real life.

I know roughly how it works, but have no idea how to build it on a studded chassis.

It dos not have to be studded, but the chassis is.

The original truck has a 8x4 drive train with studless suspension.

It is a 1:13 scale.

It's 22 studds wide.

And will have a compressor and pneumatic systems.

Bogie will likely be pneumatically operated.

Edited June 4, 20168 yr by Dafgek81

If you had the height, you could implement one of 42043 steering axle, replace the shock absorber with small cylinders, they provide plenty of downward force, ( my whole arocs sits on those Cylinders at the moment, and it is extremely stable when there full) but you'd have to find out how to position the cylinder so you wouldn't have interference from the hoses hitting the wheel. That's been my only experience with lift axles, I hope the best to you and your build. You even be able to make that last axle steered.

Thanks for the input, but the Arocs is much smaller and it dos not have a studded frame, so I don't think it will fit.

My truck will be a 1:13 scale.

And a bogie system uses the suspension off both axles to lift the rear one.

It won't be steered.

The original has a 8x4 drivetrain, mine will have a 8x2 drivetrain becaus off the bogielift.

This is the link to my Brickshelf folder, here you can see the whole truck I have build.

http://www.brickshelf.com/cgi-bin/gallery.cgi?f=561622

The original is from www.brickforge.de mine is just a other color and has a trailer.

Only some small mods made myself.

Here is a link to a explanation off a bogie system.

There is a small picture off the workings.

http://www.google.com/patents/EP0283500B1?cl=en

Edited June 4, 20168 yr by Dafgek81

Ah ok, I see what your working or now, I don't have experience with those axles, ive just experimented with using the steering axle as a lift axle, a bogie is a really strange setup, never seen one before.

Edited June 4, 20168 yr by andrewganschow

In Holland these are common.

I have driven several off them.

But building a working version is a challenge for me.

I ain't an expert builder.

Can build difficult vehicles, but need instructions to do so.

Does anyone have an idea for me?????

Doesn't anyone have any idea????

Guys???? Girls?????

I am surprised nobody has came up with a solution,my idea would be to use tow large cylinders to vertically lift the axle straight up and down.

If you need it driven you can make a telescopic shaft using pulley wheels,connect it with U-joints.

That would be a solution, but I want it to look and function like in real life, so cylinders pushing the axle straight down or pulling it straight up, isn't very realistic.

I hope someone else will reply and wants to help me.

Since you have s diagram of the real design, and you want your truck to look and work like the real one, I would suggest building a Lego version of what is in the diagram. Use mini linear actuators in place of the hydraulic rams, and a beam in place of the leaf spring (to keep things simpler). The pivot placement points and length of linkages will take some trial and error to get right, but that's all part of the fun.

Edit: instead of the removable cotter pins in the diagram, you could use the pin with bushing part.

All that should get you close to the real deal.

Edited September 18, 20168 yr by dhc6twinotter

Since you have s diagram of the real design, and you want your truck to look and work like the real one, I would suggest building a Lego version of what is in the diagram. Use mini linear actuators in place of the hydraulic rams, and a beam in place of the leaf spring (to keep things simpler). The pivot placement points and length of linkages will take some trial and error to get right, but that's all part of the fun.

Edit: instead of the removable cotter pins in the diagram, you could use the pin with bushing part.

All that should get you close to the real deal.

Here is a link to another system:

https://www.google.nl/search?q=bogie+lift+volvo&tbm=isch&oq=bogie+lift&gs_l=mobile-heirloom-serp.1.2.41j0i30j0i24.4792.4996.0.6583.2.2.0.0.0.0.138.204.1j1.2.0....0...1c.1.34.mobile-heirloom-serp..1.1.66.lmhJ0R9yH58#mhpiv=3

I don't want to use LA's, but pneumatic cylinders.

I am trying to figure something out in LDD, but I am getting stuck every time.

I just don't see how to do it.

You might want to check out the instructions for B Model to 9397 Logging truck as that has a non steered rear lift axle.

You might want to check out the instructions for B Model to 9397 Logging truck as that has a non steered rear lift axle.

I saw that, but that one does not work like the real system.

And mine has a studded chassis.

8297 has a variable ride height system with suspension but again, it´s studless and it doesn´t actually compress the suspension, it just raises and lowers the whole assembly. I guess it could be done using those big damped cylinders from 8448 coupled to springs.

This system I want to build doesn't compress the suspension either, it raises the rear axle by turning around a pivot point on the rear axle that is connected to a pivot point on the leafsprings

Did you already tried to build something? Something we could add suggestions to for example... Maybe that works better to get input, well it does IMHO.

Here you go, lift axle by moving the leaf spring pivot point.

The video is for metal RC trucks, not Lego, but the basic mechanism is visible. There are also other lift axle videos on YT from RC and real trucks (Sisu have one showing a quite different mechanism with a vertical ram).

If you have that already and just can't figure out a Lego implementation, the video at least shows someone else what's needed I hope

This is a leaf spring version, independent per-axle. On a tandem drive truck, a walking beam bogie might be more what you want? That could be done by attaching the upper springs to a walking beam also, and changing the angle of the beam with a piston or actuator, or geared liftarm.

Edited September 19, 20168 yr by andythenorth

I Will try to put up an LDD file for what I did so far.

But have to figure out how to do that first.