Compact flat subtractor - tank steering

[SaperPL]

This is a type of steering for a tracked vehicle that uses so-called subtractor which means input from motor used for steering is subtracted from the main drive input

 

Edited March 23, 2021 by SaperPL

[aeh5040]

That is compact!  And I like the symmetry - a pity the motor placement breaks it.

Edited March 26, 2021 by aeh5040

[SaperPL]

Thanks! Actually I could do a bit better with less gears and better gear ratio with new differentials. Also for a bigger model you can make neat final drives with gear reduction:

4 hours ago, aeh5040 said:

a pity the motor placement breaks it.

For Powered UP it doesn't really matter because the XL motor is just an L motor in disguise. Also if you want to make a relatively small tank model, this means you can fit a third L motor on the other side.

[1gor]

That last solution could be something used in this years flagship Cat dozer

[SaperPL]

While being stuck on the steering for my Sherman, I figured out a remix of this subtractor:

 

[JoKo]

That's very nice and compact!

I will for sure try to use it for a next self locking differential vehicle.