3 Continuously Variable Transmissions (CVT) | Lego Technic

Hi everyone,
today I'll show you multiple ways to create one of my favorite mechanisms: continuously variable transmission. While some concepts just mimic a CVT (and are more like small-step gearboxes), there are 100% continuous designs, too. If that isn't enough, feel free to check out kzbin.info/www/bejne/lYbJf5prqr10q6M for even more CVTs :)
Enjoy watching,
2in1
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Links:
Idea/Explanation Ball CVT: kzbin.info/www/bejne/goi6hHaEbJadqLs
The first gear cone appearance I could find: www.sheepo.es/2014/03/sequential-gearboxes-family.html#more
Rebrickable (part list and .io file):
Rachet CVT: reb.li/m/161404
Ball CVT: reb.li/m/161405
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Timestamps:
0:00 Intro
0:06 Gear Cone CVT
1:30 Rachet CVT
3:04 Smooth Rachet CVT
3:44 Ball CVT
5:27 Thanks for watching
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#lego #technic #gearbox #cvt #mechanism

[@matteoAmadori]

The third one is the best, most intelligend and most intresting design. Congrats!

[@yaooo26]

The first one is just not a cvt... a nice compact gearbox, but not a cvt... The second one is pretty smart and I wonder how it would behave under load. I've already tried the third one wich is by far the nicest design (in my opinion) but unfortunately it doesn't accept mutch load...

[@TheDocLamkin]

So what could the 3rd one be used for? Like are there any of these in use in anything anywhere?

[@yaooo26]

@@TheDocLamkin the third one uses the same kind of mecanism that you can find in the "NuVinci" hub, a cvt hub for bikes... I'm not aware of any other use of this mecanism in the industry but there might be, if ever you find some other exemples let me know.

[@zenus4270]

1st one is a sequential gearbox, just wanted to let ya know. 😊

[@Frank_wow]

People are watching the Minecraft mob vote while I am watching this new release🔥🔥🔥🔥🔥

[@Megobs]

The worst one won

[@gp37521]

@@Megobs the penguin was the worst one, we all wanted the crab 2 win. BTW they're adding one of the losing 2, did u catch the hint?

[@Megobs]

@@gp37521 what hint?

[@gp37521]

@@Megobs when they choose the mob he talks about how frog lost prev mob vote but we have frog. Just watch that part carefully

[@piggyplayzmc93]

@@Megobsarmadillo is the best one, for 1 reason: DOG ARMOR!

[@IkaSternenlicht]

There's something about the ratchet one that I find really funny in the best way possible.

[@jol___]

the second design is genius :D

[@BigBrainBricksSHORTS]

This guy deserves more subscribers It’s an amazing channel

[@chieseledboockshelf]

Nah he deserves the amount of subs I have

[@MoneyFootsch]

dude, the ball contraption is sick!

[@user-cz4uh3zo9c]

The 3rth one is insane !! I never think of this

[@gaujio]

Variante 2 ist im Prinzip das stufenlose Getriebe einer Sämaschine. Dort aber mit feinen Freiläufen ist es sehr genau einstellbar. Aber nicht zu dolle belasten darf man sie nicht! Hier aber zum Zeigen gut umgesetzt. 👍

[@KlapppdXD]

Beautiful

[@ChrisTrunek]

Ill add more details from what i remeber. Also, very nice build! they used an overdrive and reduction system on either end of the transmission. The input gears utilized a clover shaped gear profile to even out the rotation speed, as you can see it does not rotate at EXACTLY the same RPM as it spins. I believe it worked, but in bike racing, efficiency is better than a infinite ratios and it added weight and drag relative to the unbeatable efficiency of a chain drive.

[@ChrisTrunek]

Honda developed a DH mountain bike in the early 2000s with the second transmission. The intricacies it required to work are fascinating to examine. Ultimately they swapped it for a derailleur in a can. I have a mtb Action magazine somewhere that has a super detailed article and technical drawings of it. I believe they invented it but I could be very wrong

[@CannotStopClipping]

As a dh biker I find this VERY cool

[@valentinomanontroppo4675]

Enviolo hubs use that tech

[@tylermatheson4376]

1:30 I have never thought of doing that before but I will try it maybe even use it in my next build

[@SilentScreamer413]

That last one was pretty amazing! I never saw such a system before!

[@valentinomanontroppo4675]

Enviolo bike hubs

[@0hellow797]

So sick :0

[@mistrgekko]

The last one was the best

[@chieseledboockshelf]

1:20 you can use gear clutch to make it movable more smoothly.

[@kadelrohdri7898]

1:05 the gear grinding is antagonizing.

[@in1]

The sound you hear is just the rachets being pulled down by gravity and falling back on the gear, which is pretty far from "grinding"

[@Half_of_The_World]

All I learnt from this is that ratchet propulsion is a terrible ideal lmao, great video tho

[@heho1]

very smart 👌

[@regularperson5647]

How cool would a lego RC car be if it had a gearbox with of the second one in this video? Like a really long chain of arms for maximum smoothness

[@petersch5623]

Big “Cool” for music !’

[@josephlau8476]

It’s just like engineer or scientist, mental and mind power.

[@DIfromTCS]

would adding more ratchets improve the rotation so its less like a stepper motor and more continuous?

[@DIfromTCS]

cool idea though!

[@DIfromTCS]

Never mind my question was answered in the vid

[@largewallofbeans9812]

Would it be possible to use part 2907 to make the ball CVT have no slip?

[@in1]

Not sure, the gaps between the teeth could also cause the opposite. But yeah, maybe it's an option

[@Lee-At-Green-Pheonix-Rc]

The ratchet style if the motore slid more free ur could use a mini actuator to pull and push the motor

[@richardjulien1329]

How well does the last one ( ball ) transfer the torque?

[@RedZone4511]

The point of contact on the ball to the rubber wheel changes. When that point of contact changes so does the distance for the ball to make one rotation.

[@richardjulien1329]

This changes the speed ratio, what i want to know is for the torque ( how efficient is the transmission ? ) :D

[@aheadway]

@@richardjulien1329 as a gearbox it will definitely slip

[@in1]

As said above, it isn't that great when transmitting torque, which is also the reason why I use 2 balls instead of one. Depending on the usecase it might be smarter to use a different cvt

[@Meenakshijasbinder]

Hello also the third one is super GOOD!

[@NightTail307]

Could you make a RC car with the Transmission (JUST an idea)

[@CENREAPER-YT]

Several people did it

[@L-100]

🤯

[@adrianaanghel4613]

Um brick what lege do you use?

[@SETTINGS512]

For the first one the second gear didn’t look like it was moving

[@BuzzsawBoss]

I’ll just say, the music used in this video is the same music my school’s news KZbin channel uses for credits

[@kfiatooh666]

First one is not a CVT. Second would introduce way too much vibration and gears would wear (lose teeth) very quickly under load. Third bases on friction - similar as 'real' chain driven CVTsm, but in this example there is a lot of energy loses due to not perpendicular vectors.

[@junatah5903]

First 2 seem like they would be unreliable. Last one could be feasible but could have issues with efficiency.

[@in1]

The rachet one was the most reliable one for me, because 1 gets stuck from time to time and 3 relies on friction, but I don't think it's that bad

[@junatah5903]

@@in1 I meant reliability in terms of amount of friction involved.

[@nathanleake4073]

I'm pretty sure the first one is illegal

[@swappedsouls3312]

It isn't because stress is not being put on the gears

[@swappedsouls3312]

But the second one is

[@themetalslayer2260]

the first one is more like a sequential gearbox

[@owenpeck4857]

About the first "cvt," that's a gearbox, not an actual cvt.

[@zacknichols201]

First ones more like sequential

[@HepauDK]

The first one is LITERALLY a 5 speed manual (without a clutch)...

[@SandBox86]

EPIC!!

[@BadPiggiesTVRu]

2:36 this part is SUS

[@harynian]

Rip gears with such transmission 😢

[@bartgroothengel7594]

Nicenbut not under load. The real cvt is a double dif,combined with 2 kinds of gears,I prefer 48x24, With resistance,it keeps turning cause of the difs,you can't stop it by hand. These are experimental. Nice to the eye,but no practical use.

[@in1]

What you're describing sounds like an automatic transmission, not a cvt... #3 definitely has slip problems, but #1 and #2 can prolly even take more load than a Lego differential (which is pretty fragile)

[@in1]

en.wikipedia.org/wiki/Continuously_variable_transmission

[@alexandersafronov7796]

And I'm first!

[@SHRAPNEL_LEGO]

No

[@ChazCharlie1]

Ratchet, not rachet

[@in1]

Both spellings are correct

[@helloimcool2887]

🤯