Nuvinci / Enviolo CVT Hub Disassembled / Teardown / Destructive 

great video, thanks

Thanks for the video! Great to see the inside of one of these. (But you should set up a tip jar so we can buy you a tripod ;) )

I was curious about the internal structure, but thanks to you, I saw it well. Thank you😘😘

Good effort, hope another video of re assembly, thanks.

Luv these type of videos, thanks.

Thanks so much for this. I wanted to explore inverting this hub so that the right drive side is on the left side. This would be for single speed motorized bikes with left side chain drive. This video explains why it would/wouldn't work. I see now that the input and output drive rings are two halves with one way cam teeth and a bearing ring that sits in the middle for the cams to ride on. I see mechanically why they did this now. It's to expand the rings halves to apply more contact force and basically squeeze the CVT spheres when drive torque is applied in the appropriate direction. This additional pressure combined with the fluid, is what makes these virtually slip proof. For my concept to work, the cam teeth on the rings would have to be inverted to the opposite cam direction for that ring expansion "squeeze" to be applied when torqued in the opposite or left side direction. That means making new rings or modifying existing ones. Due diligence served, but thats where I am stopping with this endeavor.

Amazing engineering to get all those balls and races into that little housing. Like all CVT's the actual ball to race contact is infinitly small and can slip under hi loads. The special black liquid in the hub is designed to "stack" up around the contact spots increasing friction between the hardened steel surfaces. Not as efficient as a chain with discrete sprockets, but smooth and quiet and stepless instead. Perfect for the leisure and rental market. Would I tour across Mongolia with it..Nope.

Very interesting. Remarkable engineering. 👍

Very interesting thank you for filming this. I have disassembled many of these hubs over the past decade but never a newer model Cargo hub which this one is. Wasn't easy to see but one of the modifications which I was promised would make the hub better appears to be plastic end caps on the planet axles. Very unimpressed but got 2 on test at the moment so will see how they do. Maybe there is more to it so should reserve my judgement until after more testing. I experimented with bronze bushings as end caps and they would wear out quite quickly but did save the stator. These things still don't appear to be built to last which is a great shame because I love them.

OOh I get it now! They are using the torque from the pedals to create the clamping force for the "ball transmission". Thats the point of those ramp-things at 2:26. I was wondering how they are creating the clamping force without a big spring

the enclosure that holds the enviolo also holds the spokes. And is very brittle, spokes break out of it, ruining the whole thing. You showed it, I experienced the same

Very cool, thanks. It looks very heavy for a bike hub, amazing engineering though.

I know everything about it, it's awesome

I'm trying to make a geared unicycle from one of these, and am interested to see the planet carrier is fixed to the shaft. Not a problem in a regular bike for a unicycle the shaft needs to transmit torque between the pedals, and if the transmission input is coupled to the shaft then there is no relative motion between the planets and the input ring, which is a big problem. I could hold the input ring fixed against the frame, but then the wheel will turn the wrong way and the input ring will disengage, not transmitting torque. Also, suboptimal to be unable to ride in reverse. A good puzzle!

Can you open it without using a saw? I suspect the notched structure behind/around the freehub will take a special tool?

Damn that looks complex 😊 There's got to be a simpler way. I think the future is in better chain+cog alloys and surface treatments. They should be able to boost lifetimes of standard chain-Derailleur setups by 10x.

Very interresting. I have been riding a 380 for 3500 km now and it works very well. But one thing I still do not understand: how are the planets tilted and held in the desired angle? It is not explained og visualized in any picture or video I have seen yet. Yes, the old ones had a kind of fork around the planets, moved by the center roller but it seems they use another principle now?

Wow. That's truly a monster of complexity. I intend to buy a bike with enviolo. Would you recommend? Thanks for the video. 👍😎

How can they manufacture and sell that hub retail for around 120USD? There are so many machined parts inside and the assembly complexity is incredible.

I know Valvoline manufactures the friction fluid used inside those NuVinci hubs, but don't know its exact specifications.

I assembel this hun in enviolo

cool technology but it looks like a maintenance nightmare

Rider hit by automobile by the look

Насколько же ты криворук 🤣

Get off your wallet and buy a tripod, Or make one.

Interesting video but very annoying camera movement. Also it's frustrating to see the videographer fumbling with one hand. A bit more professionalism would have made this video more tolerable.