3 Continuously Variable Transmissions (CVT)

3 Continuously Variable Transmissions (CVT) | Lego Technic

Рет қаралды 118,426

Күн бұрын

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 • 2 Continuously Variabl... for even more CVTs :)
Enjoy watching,
2in1
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Links:
Idea/Explanation Ball CVT: • CVT from LEGO with exp...
The first gear cone appearance I could find: www.sheepo.es/2014/03/sequent...
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

Пікірлер: 82

@yaooo26 9 ай бұрын

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 7 ай бұрын

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

@yaooo26 7 ай бұрын

@@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 6 ай бұрын

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

@Frank_wow 9 ай бұрын

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

@Megobs 9 ай бұрын

The worst one won

@gp37521 9 ай бұрын

@@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 9 ай бұрын

@@gp37521 what hint?

@gp37521 9 ай бұрын

@@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 9 ай бұрын

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

@jol___ 9 ай бұрын

the second design is genius :D

@matteoAmadori 9 ай бұрын

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

@BigBrainBricksSHORTS 9 ай бұрын

This guy deserves more subscribers It’s an amazing channel

@chieseledboockshelf 8 ай бұрын

Nah he deserves the amount of subs I have

@IkaSternenlicht 8 ай бұрын

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

@MoneyFootsch 9 ай бұрын

dude, the ball contraption is sick!

@KlapppdXD 9 ай бұрын

Beautiful

@user-cz4uh3zo9c 8 ай бұрын

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

@ChrisTrunek 8 ай бұрын

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.

@0hellow797 9 ай бұрын

So sick :0

@Half_of_The_World 8 ай бұрын

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

@ChrisTrunek 8 ай бұрын

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 8 ай бұрын

As a dh biker I find this VERY cool

@valentinomanontroppo4675 6 ай бұрын

Enviolo hubs use that tech

@heho1 9 ай бұрын

very smart 👌

@zat-1-fury 9 ай бұрын

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

@gaujio 5 ай бұрын

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. 👍

@kadelrohdri7898 7 ай бұрын

1:05 the gear grinding is antagonizing.

@in1 7 ай бұрын

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"

@SilentScreamer413 8 ай бұрын

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

@valentinomanontroppo4675 6 ай бұрын

Enviolo bike hubs

@mistrgekko 8 ай бұрын

The last one was the best

@regularperson5647 9 ай бұрын

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

@largewallofbeans9812 9 ай бұрын

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

@in1 9 ай бұрын

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

@chieseledboockshelf 8 ай бұрын

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

@josephlau8476 9 ай бұрын

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

@petersch5623 8 ай бұрын

Big “Cool” for music !’

@Lee-At-Green-Pheonix-Rc 8 ай бұрын

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

@SandBox86 9 ай бұрын

EPIC!!

@DIfromTCS 9 ай бұрын

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

@DIfromTCS 9 ай бұрын

cool idea though!

@DIfromTCS 9 ай бұрын

Never mind my question was answered in the vid

@adrianaanghel4613 8 ай бұрын

Um brick what lege do you use?

@richardjulien1329 9 ай бұрын

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

@RedZone4511 9 ай бұрын

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 9 ай бұрын

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

@aheadway 9 ай бұрын

@@richardjulien1329 as a gearbox it will definitely slip

@in1 9 ай бұрын

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 9 ай бұрын

Hello also the third one is super GOOD!

@SETTINGS512 9 ай бұрын

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

@L-100 9 ай бұрын

🤯

@NightTail307 9 ай бұрын

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

@CENREAPER-YT 9 ай бұрын

Several people did it

@BuzzsawBoss 9 ай бұрын

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

@kfiatooh666 5 ай бұрын

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 8 ай бұрын

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

@in1 8 ай бұрын

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 8 ай бұрын

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

@themetalslayer2260 9 ай бұрын

the first one is more like a sequential gearbox

@owenpeck4857 5 ай бұрын

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

@zacknichols201 8 ай бұрын

First ones more like sequential

@nathanleake4073 9 ай бұрын

I'm pretty sure the first one is illegal

@swappedsouls3312 9 ай бұрын

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

@swappedsouls3312 9 ай бұрын

But the second one is

@HepauDK 8 ай бұрын

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

@alexandersafronov7796 9 ай бұрын

And I'm first!

@SHRAPNEL_LEGO 9 ай бұрын

@BadPiggiesTVRu 9 ай бұрын

2:36 this part is SUS

@harynian 8 ай бұрын

Rip gears with such transmission 😢

@bartgroothengel7594 8 ай бұрын

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 8 ай бұрын

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 8 ай бұрын

en.wikipedia.org/wiki/Continuously_variable_transmission