Finally a gearbox that doesn't need springs or elastic bands

I’m simply amazed at what can be built using LEGO and also so impressed with the way an engineer’s mind works! This is very cool.

Thanks for the detailed breakdown. One question, since the slipping gear is always slipping, do you sacrifice a lot of engine power?

2:28 you broke my mind because its so ingenious but so simple. awesome concept!

i am speechless about this auto-gearbox its... unbelivable simple

GREAT explaining. I really learned something today. Never thought this would interest me, but it was soo captivating!

I see you've experimented with big trends in the past, but please stick with lego engineering videos! If they are as good as this, I'm sure your channel can grow.

This is way better than the idea I came up with as a kid. Mine shifted from 3:1 up to 1:3 via a centrifugal governor and just ground the gears until it built up the speed to shift. Seems to me I messed around with differentials too but that first one stick in my mind because I remember that once it got going it could actually outrun me. Good times.

I am impressed. Thanks for sharing this amazing automatic transmission idea. I will definitely use this design and will pray for you when having fun. Awesome :)

Finally a video as simple and educational as the old chevrolet videos

That amazing explanation of transmission system Hats of you 👍👍👍🙏

I imagine there's a range where the resisting torque on the output is high enough to cause the clutch to slip, but low enough that it allows the clutch gear to still rotate, effectively giving a range of variance in the output ratios. I think that this may actually be a CVT

Very cool idea. I just wonder if that is kind of a magical illusion that looks right, but it works only because the car would also successfully climb the hill also without the transmission. Isn't there simply the extra force coming from the higher gear ratio "destroyed" by the friction in the clutch?

Well done. I thought of something similar decades ago, but the Lego parts I needed to build it didn't exist yet; by the time the parts I needed did exist, I had moved on to other hobbies. Nowadays I wrench on purpose-built RC cars with tiny engines.

Really cool concept and it seems to also have a small cvt component. However, transmission ratios are input divided by output. 2.33 would describe a gear requiring 2.33 input rotations for 1 output rotation. Likely just done backwards but in the automotive and industrial world its backwards which leads to a little confusion. Awesome concept and it would be cool to see more gears added in this way.

Very well explained! Thanks!

That's just awesome! So simple yet so ingenious. Should put one of these on an input shaft, speed it up or slow it down with gearing, then put another one. Should be able to get 3-4 speeds out of it with with different torque thresholds.

Excellent, best video explaining a Lego auto transmission.

Thats a beautiful and smart creation

this looked like a video were a well known design was claimed to be revolutionary, but this was actually really well made, and well explained, this video actually wowed me.

Really clever! Nice and compact, simple, efficient. You can put more than one in a row as well.

It is not only using 1:1 and 2,33:1 speed ratio but a large fork between both (we can see in a slomo white geer turning sometime). Very clever and compact. I cannot wait to see it on a train. Thank you for sharing.

Very well explained!

I like how you repurposed a differential to use as a transmission! Very cool outside the box thinking!

Genius, SUPER GENIUS, greetings from Lima Peru

Excellent video with a great explanation and demonstration of how it works!

Final a great design with even a greater explanation

Freaking awesome 😲👌🏼

Awesome videos, thank you so much for share.

Very simple and functional.

Now this is brilliant!

This is a fantastic idea! It would be rad if they made a small self contained torque converter with a stator. It would be insane torque multiplication.

I am so excited i saw diffential drive shaft in my lego insruction ,thats why i did test run

Lego has come a long way since I was a kid.

Thanks for this idea in the moment i am building a crawler and this video hleps👍🏽

Awesome thanks for the Auto Transmission

Very good explanation!

Really nice man good job

This could be an excellent concept for a practical CVT in a car if: 1) a hydraulic torque converter is used instead of a clutch, and 2) a reverse gear is included.

This is fantastic! Great video!

Thanks for this cool video and the time you spent on explaining. Question: Does/ doesn't the friction gear wear out quickly in this construction?

that's a really cool little device, might have to build one now

Thats so cool Great job man

This is incredible!!!

Very impressive. You could add something like a rachet to stop feedback under heavy load. Although I barely saw that happen in the testing you showed.

In particular range of load it behaves like gearbox. However, under the very high load: engine works, vehicle stops and clutch slips different direction. I like the solution with the clutch/friction, as it enables smooth rotation speed change depending on load. It's great! Nevertheless, I prefer the friction between "gears" (like in planetary gear), when the minimal speed (the first gear) is limited by the engine power, not by gear clutch. Regards

Beautiful job. God bless you.

Simple, but does the job perfectly

It's compact and it looks to be efficient too! Very good job !👍🙂

this video is brilliant

thank you for explaining nice vid

отличная идея! будем использовать )

I have been looking for this so long

So genius in its simplicity.

i rewatched this several times. It’s genius.

This is a super cool design and is actually a fairly similar idea the Toyota Hybrid system uses (except obviously much more complex, being motor-generators rather than gearboxes and they can adjust to act like a CVT instead of a 2-speed gearbox)

Such a good idea

Very simple but awesome solution to a big question.

Very usefull! Thank you!

It is fascinating, what everything is possible to make from Lego... 👍👍

A more complicated version of just using the slip clutch alone, awesome.

I never realized what the white gear was for until now

Extraordinary !

Fantastic construction - and very well explained... thank you! 😀👍

Freaking Legend. Totally going to build this going forward. Much Appreciated.

Some seriously clever engineering here for a fun Lego project!

I really appreciated the simplicity of the solution, much better than other solutions that require more pieces. I have actually applied your solution to one of my MOCs, my red station wagon, which is equipped with two L motors. But unfortunately the friction clutches (one for each motor) spin the opposite direction it should when stressed, probably due to the MOC's weight (850g)... I believe in my case each motor should get two friction clutches, but there's no room for this upgrade. Anyways, just sharing the experience, I'll apply it to a lighter model instead. Cheers!

*”Let me explain you”* So cute 😄

For a basic automatic transmission made from lego, it is wonderful. I'm a little surprised that the lego makers didnt come up with it. Ir they haven't taken your idea and used it

Very good

Brilliant!

Very clever.

Yes this is the right approach when you try to use a differential like a gear box, (in the lego world)

Thanks!!!!!! Now i can make an offroader that won't constantly go slow

Great idea! However I found that using two motors instead of the clutch works better. I used a non Lego product called Sbrick in order to shift manually via bluetooth. Using different gear ratios helped my vehicle pick up speed but still have the power to take off from a start.

Thank you for explaining and not just showing it.

Nagyon jó ötlet!

Dude, that was educational af -- subscribing for more like this. 👍🏻

Theoretically, could you stack 2 of these for a wider range of speed? I'm assuming it would become slower but stronger

Brilliant

Amazing!

Best innovation you can change the world good luck

And the Lego powerglide is born!

Such a simple mechanism and better than every other automatic gearbox I've seen made with Lego. And you know what the best part is? Every other solution I've seen involves gears grinding at least some of the time, this *JUST* works.

You are basically doing what Toyota is doing in their CVT cars. They use a planetary gear with 1 output free spinning until you want to accelerate. At the point you want to accelerate they apply a force to the free spinning gears causing the energy to redirect into the wheels. Now you could use a clutch for this but Toyota was like nah lets use an electric generator motor for that. So they take away energy from the gears which is used to power the electric motor. (And stuff like the AC.) Since a planetary gear is solid metal the transmission basically never has to be replaced. And since they don't use a clutch the amount of force is never really that big. You can activate reverse while still driving forwards and nothing will break.

Nice explanation :)

this must be one of the best gearboxes ive seen on YT

My friend made one of these when we were kids. He chained 3 together in series to have more gear ratios.

That is the Best gearbeitet ever made

Good job

Gotta say this is very impressive editing for a small video about a lego gearbox, the swapping of the parts on the buildup, and the transition into the gopro view were pretty neat.

Some old cars had an "overdrive" cruising gear that worked on a principle similar to this

This is the basic principle of the Voith DIWA automatic gearboxes mainly used in city buses. While stationary and at the beginning of acceleration, the engine's torque is fully transferred through the (internal, it's not seperate as with most gearboxes) torque converter and the lower the speed difference between engine and gearbox output the more this shifts towards the parallely operating fully mechanical 1st gear. At a certain speed difference the torque converter will then become almost completely needless and the fully mechanic 2nd gear is engaged. With this gearbox type, the torque converter is only functional in 1st gear and is disabled from 2nd (of the 2, 3 or 4 gears) onwards, but is used as a retarder, just to have mentioned this.

i found yhis so use full it is copmact and doesnt use complicated pieces well done :)

I pass the smallest transmission medal to you. Good job!

AWESOME!!!

Thanks for this idea and clean explanation. Im just wondering, doest the friction wheel steal great amount of power while it stands still? Feels to me that the motor has to force through its resistance.

normally i would think of "auto transmission" as say first gear max is 60 mph, when i get to 60 mph the gearbox would automaticly switch to second gear, etc etc till last gear. but this is a good enough model :D good job!

Nice idea :)

my new standard moc gearbox.