LEGO TECHNIC 3 SPEED AUTOMATIC GEARBOX

Building instructions :

Music called "Force" from Alan Walker

Filmed with a Canon EOS 700D and edited in Final Cut Pro X 10.2.2

© Charbel 2015

[Kelkschiz]

Wow that is a pretty clever mechanism. Well done!

[crispygolden]

Finally, a gearbox that I have parts for! Thanks!

[OnlyNotes]

I'm still trying to wrap my head around how this works, but I think I've got it now...

Power is fed though the transmission and into differential piece. Under load, the input and output shaft of the differential want to spin at different speeds. This acts on the grey differential case causing the ring gear of the diff to rotate. That rotation pulls on the arm that controls what gear the transmission is in, and drops the transmission into a lower gear.

It's quite an elegant setup. Kudos!

[TechnicDragon]

I also experimented with automatic gearboxes but none of mine did its joob as good as yours
Real nice work!

[torstonvodesil]

This is too good, I was playing around with manual 3 speed gearboxes then I saw this...

[theliftarmandbeam]

Beautifully simple and effective design. Well done.

[zachdurocher]

I can’t open the file. But the gearbox looks pretty great

[RarallRC]

i often think that these type of automated gearboxed are impractical to use in a actual i think this one will stand out with a awsome shifting mechanism and a cool video ;)
good job!

[quintenluyten]

Very well done! It's compact, works well, and the video is very well filmed

[Micksoffthings]

I leave this under every video I watched, it helps the algorithm.

[lukaszjot]

Your gearbox is one od The few real gearboxes on TY. Most of them are just torque converters or differencials. Nicely done with the self adjusting gears on The basis of a differencial.

[maxzulik]

I can't open instructions pls make it PDF or smtng like that

[m]

This is weary cleaver thinking! It is defenitly one of the most simple auto transmissions I have seen, build in LEGO
Could you provide the building instructions, so I can build this an put it on my 8*8 scale truck :)

[MechanicalMadness]

Very good and well made I also modified it myself for a 2 speed low range high torque version and many other cool mechanisms using the differential ideas well done.

[bitarmory]

This is definitely an interesting design, although if the transmission depends on resistance in the output to shift, I'd recommend reversing the gear ratios. Resistance would likely be caused by an obstacle, and you'd want more torque instead of speed to overcome it.

[legoengineer]

I may have an idea to turn this into a cvt. Use the same differential resistance sensing system and attach it to the mover on the cvt.

[sawer]

This is ideal for rc lego cars that need to be fast!

[screBDO]

Basically, it is not real gearbox. All energy, that should transfer to the output upon load, is used to stretch and maintain the rubber string.

[brandongeiger]

im creating a dragster for a robotics class in school and waz wondering if i connect it to a differential if your gear box would be anh benefit?

[tvsamsung]

Man, please, please make tutorial for it, this link doesen't open