Lego 2 Speed Automatic Gearbox

[colin2219]

whats the song called?

[pnelego]

why dont you use this in your trial trucks? 

[searme]

@pnelego Because it can't handle that much torque.

[dennix01]

Ha, good gearbox and better music :-p

[HerculesOnSteroids]

Amazing work!!!!!!!!!!!!!

[seba5400]

i make it with a xl motor and its working

[Drspeedstackingguy]

i am still so confused, is it that the grey part near the end connects the gear with the wheel.( but doesnt move) but if the wheel is slowed, the moving gears behind it, turn it ( the grey piece) in a way to change gears? plz reply !!!!!!!

[pnelego]

@Drspeedstackingguy its because the grey peice is a differental. so it moves when under

preasure. all he did was converted that force to that large lever to shift gears.

[Benjuthula]

Brilliant.

[Eddo1998]

Would it still work with a XL motor or not?

[searme]

@Eddo1998 It works with any motor.

[jhsevs]

Is it possible to replace the dark grey part in the end?

[searme]

@jhsevs Not really.

[mescalinum]

I think you can increase the sensitivity by driving the differential at higher speed, and then reducing again its output.

would be interesting to see it

[legostuffguy]

those are quite inefficient arent they

[jpk806]

i made a 3 speed with this ame concept, thankyou

[dillonconrad]

how wel would it work run back words in a off road truck? would it automaticly bumbp dow the gear ratio?

[searme]

@dillonconrad Unfortunately not.

[dillonconrad]

o i made a bit bigger version out of 100%technic pices so i could put it in a car but it stays in low gear

[20TELETRABI08]

@dillonconrad

I have not tested it yet, but if you use an excenter located opposite to the actuating direction in it's "normal"/"low torque" position, die turning of die differential to both directions will push your actuator forward to the lower / high torque gear. So just set another gearwheel on top of the one driven by the differential and rotate the excenter 90 degree to the far out position in low torque conditions.

[20TELETRABI08]

@dillonconrad

@dillonconrad

I have not tested it yet, but if you use an excenter located opposite to the actuating direction in it's "normal"/"low torque" position, die turning of die differential to both directions will push your actuator forward to the lower / high torque gear. So just set another gearwheel on top of the one driven by the differential and rotate the excenter 90 degree to the far out position in low torque conditions.

[Madmonkeythegreat]

this has been a great help for me disigning my own transmissions tanks alot

[lolbroek743]

what sets you used to build this gearbox?

[searme]

I used parts, not sets.

[bmxari]

thanks for the idea =]

[noiseqowoy]

The music is really annoying. Gearbox is amazing! ;-)

[trav10854]

you're amazing! i was looking at the pictures on your site i did not understand this but now in the video i see how it works. very smart i think

[calvinthedestroyer]

ugh, we can do WITH OUT the music.

But very nice tranny, can't wait to see it in a car

[occeo]

Should get it to run uphill.

[Lwdwich]

Do you think that's possible to make one auto gearbox without differential? (i don't have one =P)

or if it's possible to make one just like this, but with 3 speed?

[searme]

@Lwdwich No to first question, yes to second one.

[tomanater00]

i had no idea people did this type of stuff with legos.

[miniUMM]

Can i use a Power Functions XL-Motor ?

[searme]

You can use any motor whatsoever.

[Safhata]

Now THIS is interesting :P

[ats1995]

smart design, but a lot of friction?

[pilot2b1993]

You should make a video of the car going from flat and level ground to a hill or slope of some sort...

*Thumbs up if you think its a good idea*

[mmmrainbow]

its works well but i prefer zblj1987's its simpler would be easier to build

[nannytenerife]

brilliant!!

[L3G0nerd]

what is the # to the differential gear casing peice?

[searme]

The part number is 62821.

[L3G0nerd]

hello searme. i like it. but does it move in reverse! mine does, check it out sometime. i'm a big fan of yours

[skylorz]

AWESOME!!!!!!!!!!!!!!!!!!

[LegoTechnicGod]

I built this to try it out because something didn't seem to work quite right, and I was right. It's a good idea in theory, but doesn't really work well. Especially if you would build it into a larger car.

[L3G0nerd]

good but leaves 2 much pressure of the motor making a but chance of it dieing.

[fashnek]

The loud music was really unnecessary.

[bubinasuit]

but awsome

[wh00kiers]

what's the music?

[fashnek]

Marilyn Manson - Seizure of Power, from the Resident Evil soundtrack.

[rockntroopen]

man that is so cool!!!!!! vey impressive....

[mp3KING13]

can u but this in one of ur trail trucks for going up hill?????????

[icanhaslego]

the gears probably can't take that much torque- right angles with bevel gears aren't that robust

[searme]

The gears at right angles here are used only for switching gears, not for transferring the drive.

[rocketman468]

one of the smartest lego things i ever seen

[4521crismit]

WOW speechless i built it and just soooo smooth when changing gears BTW what is the songs name cause its great

[Ravier03]

OMFG... Impressive!

[cedartowndawg]

Not to be dense but could it work in reverse?

In theory of course.

What I mean is could it go from a lower gear and if there was low friction or what have you in the one gear so that would shift up to the higher gear?

[searme]

Not in this version, it would have to be a little more complex.

[corotor12345]

actually, this one does exactly that, cuz if you give it less friction it will move back up... in practice when you put it on a car and run it, it does what you say, goes from more, to less resistance

[lomtafix]

very nice 5 *****

[nordmensch]

absolutly fucking awesome work dude ist crazy ..this is a realy good idea 5 *****

I am german my english is not so good sorry

[Shannariano]

are you going to use this design in the next truck Trial?

With the right tension on the rubber band I bet you can have the gears switched on heavy slopes

[searme]

I don't think it would work well in Truck Trial. It seems rigid and reliable, but experience shows that every complex mechanism tends to fail in the Truck Trial conditions.

[TheDivineCellphone]

this new automatic gearbox design is awesome !

i've been waiting on something like this !

Searme - you're the man !

[Eugbob]

Can you make this into a three speed design or will it ruin the gearbox? Ruin meaning ruining the design or making the speed change worse.

[searme]

It will make the speed change worse.

[TheDivineCellphone]

doing a 3speed would be as simple as chaining 2 of these gearboxes in sequense...

[searme]

Yep, it can be done easily, but I think that 2 speeds with almost 3x ratio difference is suffucient for most of the vehicles.

[M4X1994]

Wow amazing, too bad i dont have that kind of differental, maybe i can still build it using the new ones! 5/5

[bioniclealek789]

NICE work and i mean NICE.....

[ctdyson]

This would work great in the new PF trains, if you could find away to make it fit.

[searme]

They have a speed control there, so what's the point?

[eno315]

Clever design. Simple and smooth. I will use this in my Back-hoe.

[hutadut]

WOw!

next you could make one that goes in reverse when it hits an obstale!

[searme]

A simple switch could do that, no need for a gearbox.

[krudmuphinstudioz]

Wow! Awesome! And to think I could build one myself! I just need one of those darn large grey gears with the internal gearbox.

[searme]

This is a differential gear.

[awzummongoose]

you should go work for lego thats amazing

[Mudskippersam]

Wow, this is simply ingenious...

[SuperToneTV]

YOU are a genius!!!