Bandeirante Selfmade Swing out Spare tire carrier (4 Viewers)

[PEOPLES]

Good morning,

I have some issues with the swing out carrier right now. It's attached to the cabin and it's struggling a bit with the weight, I guess. I start to get little cracks around the mounting points.

I thought of building a new one myself, a reinforced version. With the option to carry 3 jerry cans and it would swing out to both sides (to distribute the weight better).

I would like to bolt it only to the lower crossbeam, not to the cabin itself. To do so, the design would need to be a bit beefy. The idea is, to get the parts laser cut and bended and then weld in additional parts to make it stiff.
1. You guys think, the crossbeam at the car frame is capable to deal with the load? Not so much concerned about the weight itself, more the torque (due to the weight).
2. Which material? Steel in 3/16 or will it need to be 1/4?

Thanks a lot

 

[mcmlxxxv]

I would replace the rear bumper beam by something heavier ... made mine from a 1/4thick steel beam , trailer axles bearing and the swing out arm from 1/8thick 1.5x3 steel beam

 

[mcmlxxxv]

Might give some inspiration

 

[PEOPLES]

Do you have some detailed pictures of the construction? Specially the swivel

 

[mcmlxxxv]

Ask and you shall receive

 

[PEOPLES]

Very nice, thanks a lot.

I will try to run it through a CAD program, but 1/4 is pretty solid. Do you think, that's a bit overdone or just right? The arm looks straight forward, my feeling would tell me to make it a bit more beefy, are you fine with it?
Anything you would change?

Thanks a lot
Michael

 

[mcmlxxxv]

Very nice, thanks a lot.

I will try to run it through a CAD program, but 1/4 is pretty solid. Do you think, that's a bit overdone or just right? The arm looks straight forward, my feeling would tell me to make it a bit more beefy, are you fine with it?
Anything you would change?

Thanks a lot
Michael

Mine hold well.. I think 3/16 would be just fine too. I plan on adding a pole on the tire carrier , other than that it's plenty strong.

 

[PEOPLES]

I'm doing the math right now. I'm struggling to find a nice swivel mechanismn down here. Or I miss the right term for it.

1. Try. the base made of 3/16 in a U-form. Even more junction plates to make it stiffer wont help here. Hitting easily 300MPa in the corner.

2. Welding in another piece, making kind of a box in the left side. Hard to see because everything is blue. But it's there

3. Using more of the (cheaper) 60x40x3 steel beam. Seems, the steel beam is thick enough, no probs here. At the edge of the junction plate is a little spot with well over 250 MPa. I guess it's a FEM-problem with the net, there is so many layers of material/steel, the pressure should easily distribute there. Maybe just welding it in with a extra thick seam.
Displacement is no problem at all, load around 150kg on the outer part of the arm. This should be around double the expected load.

4. Funny: A second junction plate on the right side will not change anything.

I will optimize a bit more and take off material at places with hardly any load.