XL Differential

[Tommy Styrvoky]

I have designed this reinforced differential for a large 2 differential steering system for a very large tank model in the far future. I lack the small turntables to build this at the moment, but I believe this will function correctly and be a medium sized differential that doesn't utilize the large turntables. Since I lack the small turntables, I think this will work, but I'm not sure how well it will hold up to torsional stress, but this could be fixed if there is 2 gears being used to power both turntables in sync. It may be prone to seperation where the turntables are connected to the main frame of the differential.

Version 1

http://www.bricksafe...erential xl.ldr

Version 2

I reinforced the differential

http://www.bricksafe...ntial xl V2.ldr

version 3

Version 3, I took Zblj's suggestion and replaced the 20z's with knob gears.

http://www.bricksafe.com/files/Tommy_styrvoky/differential%20xl%20V3.ldr

differential xl V3 by Tommy Styrvoky, on Flickr

differential xl V3 exploded by Tommy Styrvoky, on Flickr

Edited April 9, 2015 by Tommy Styrvoky

[Zerobricks]

Can you please also post a picture?

[Tommy Styrvoky]

Can you please also post a picture?

I will try, as I am at school and for some odd reason I can't upload photos to flickr, but I can try uploading to bricksafe.

[legolijntje]

Here's a quick ( and LQ ) image:

[Tommy Styrvoky]

Can you please also post a picture?

Images have been added.

[Tommy Styrvoky]

I reinforced the differential further, I don't think it will come apart or have any problems now.

http://www.bricksafe.com/files/Tommy_styrvoky/differential%20xl%20V2.ldr

Edited April 8, 2015 by Tommy Styrvoky

[Zerobricks]

Sorry but that is IMPOSSIBLE to build. Tricky to build Use knob gears, they are stronger.

Edited April 8, 2015 by Zblj

[nikolyakov]

But how you will connect 5L liftarm in the middle and #1 connectors? Some force?

[Tommy Styrvoky]

But how you will connect 5L liftarm in the middle and #1 connectors? Some force?

It's possible to assemble without force, it's just a puzzle.

Version 3, I took Zblj's suggestion and replaced the 20z's with knob gears.

http://www.bricksafe.com/files/Tommy_styrvoky/differential%20xl%20V3.ldr

Edited April 9, 2015 by Tommy Styrvoky

[Jeroen Ottens]

For even further locking of all parts you might want to use two thin 5L beams with crossholes at the end instead of the 5L thick beam in the center. That way the #1 connectors are fixed in rotation. In practice it will stiffen the structure I think.

[Tommy Styrvoky]

differential xl V3 by Tommy Styrvoky, on Flickr

This photo summarizes the assembly components, first build the central piece, then attach components with turntables, then mount axles to knob gears, finally attach the longitudinal pins to complete it.

differential xl V3 exploded by Tommy Styrvoky, on Flickr

[Boxerlego]

This differential build looks like it is going well. It will be interesting to see how the reinforced differential will work out with both kinds of gearing bevel and knob. The knob gears when under high load tend squeak after a little while.

[Tommy Styrvoky]

For some odd reason I forgot to have the newer color for the 5 long axles, the instructions have been updated, and I am preparing to upload this to rebrickable. Also I will begin designing a XL dual differential steering system.

[Tommy Styrvoky]

here's some new renders, I am still working on improving them, right now I use LDview to render them.

differential xl V3 by Tommy Styrvoky, on Flickr

differential xl V3 exploded by Tommy Styrvoky, on Flickr

[__________________________]

This is a pretty clever idea! Would this be useful for subtractors for tanks?

For any other application, it seems 2 perpendicular knob gears would be best.

[Tommy Styrvoky]

the model is up on rebrickable http://rebrickable.com/mocs/TommyStyrvoky/xl-differential

[__________________________]

the model is up on rebrickable http://rebrickable.c...xl-differential

5 bucks for 100% of the pieces I think I actually have the parts to build this...

This is a step toward more powerful tanks, since there is no worry of the knob gears breaking under massive torque.

[DickesC]

Has anyone actually built this?

From the pictures i think it will break under high load

[Tommy Styrvoky]

Has anyone actually built this?

From the pictures i think it will break under high load

It should be structurally solid, if it is reinforced correctly in the frame around it. Where do you think the differential will break ?

[DickesC]

If you look at this picture

I think there is nothing that prevents the turntable on the right side to go "up" (and the left one to go "down")

But i think it has to be built to check that

Edited April 13, 2015 by DickesC

[Tommy Styrvoky]

https://www.flickr.c...07/17061951286/

If you look at this picture

I think there is nothing that prevents the turntable on the right side to go "up" (and the left one to go "down")

But i think it has to be built to check that

That's the only place that I worried about, but if the differential is build in a sturdy frame, I don't think it will be possible to force the central section out, as It would require an immense amount of force between the wheels.