[HELP] 4 Wheel Driven Differential

[Leif]

This mining truck, grand!

http://www.siemens.com/innovation/en/home/pictures-of-the-future/mobility-and-motors/electric-mobility-world-s-largest-dump-truck.html

It uses 2 diesel engines to generate electric power to power 4 motors, one for every wheel. I assume.

Given computers and all kinds of receivers and transmitters and all kinds of gadgets I guess everything works as planned, but is it really the computer that slows down the motors on the inner track when turning? Or 2 motors coupled together, per axle and a differential per axle? Don't think so?

As you all may have figured out my question really is how they overcome the issue with differential, if each wheel is driven independently.

[Imanol BB]

thats a Belaz 75710, i made an small prototype some time ago, and i used diffs, however, the real truck uses independent electric motors, for independent control and distribution of the power, and a security system in case of one of the motors fails, this truck could be built in lego using differentials with no problem, because, like the large front loaders, the wheels of the same side will move at the same speed beacuse they follow the same line, so there wont be any problem, and you can also build it with 4 independent transmission using motors, beacuse, if a motor slows down the motor on the other side will have more speed, and it will work just like a differential. you can also see this page: http://www.mocpages.com/moc.php/406987

[Technic Jim]

@ImanoIBB I'm not Leif but that reply is really helpful - thanks!

[Leif]

Thanks, your build got some potential and some unique ideas!

[Imanol BB]

that model of mocpage is not mine, i just find it some time ago while trying to make another version of my prototype :), however, i will see if i make some experiments for a bigger model, and good luck if you have started to make one.

[ben20]

It is not posible (to do it perfect) with Lego because the electronics to do this are verry complex. I tried it with my Lego wheel loader and it didnt work smooth. I also do Bruder rc conversion, and they use one motor for each wheel.

If you have a heavier model (like my Bruder) it is better, but never as good as with difs.

[Imanol BB]

yeah, maybe it could be possible with a enough heavy model or with NXT and a good programation of them, then it might work well, but diff will be always the best choice.

[Imanol BB]

Hi again, i have tried to make a "little" transmission for lager models, what i thought it wouldnt be too big, became in a extremely large transmission, only one axle has 2 XL motors, 5 turntables, and at least 4 large shock absorbers, and it is thought to have 4 third party tires, beacuse even the unimog´s tires seem too small, the transmission system is based in the creations of 2 expert builders (Efferman for his planetary rim and Jeff55 for the turntable portal hub, thanks to thems), but it is highly modified, the 2 XL motors are geared down 12:1, so, they will have enough torque, i hope you like this design, however, it was a quick design, any suggestions are greatly received:

LXF: http://www.brickshelf.com/gallery/imanolB/Belaz/belaz.lxf

[Sylvian]

I really like your solution on connecting the turntables to support dual tires. I might want to adopt that...

[andythenorth]

Where one motor drives each wheel there is no need for any differential effect (electronic or mechanical), the model will drive just fine in turns.