This is the first major change in CVT technology since Salsbury invented the CVT in 1937. Using the Viscous Coupling concept along with the drive variations is really smart. I'm looking forward to seeing how it works out in real life applications.
@bradleysr
4 жыл бұрын
*kuck* nissan toroidal cvt + fluids *kuck*
@vladlu6362
4 жыл бұрын
This has been done with LEGOs for years...
@Techridr
10 жыл бұрын
I just test rode a Novara bike at REI with this transmission. I'm extremely impressed. No clicks, no nothing. Also, you don't have to pedal to change ratios, just a smooth twist. Front sprocket to the rear is by belt. Also very smooth! This transmission might be great for scooters and small motorcycles. We'll see what happens.
@Techridr
9 жыл бұрын
Shane SRAM My comment was 100% about the transmission. The only part about REI was that they were cool enough to let me test it. You must be a special kind of stupid.
@donaldasayers
15 жыл бұрын
It's a Knopp variator. (Google it) It's a very old design. As for the fluid, well it's oil. Common or garden oil. All that has been described in the video is the behaviour of any hydrocarbon oil between a ball bearing and the surface it rolls on. It's a neat bit of engineering to get it small enough for a bicycle, but as with the Knopp, efficiency will be low.
@paintball4life280
15 жыл бұрын
Currently CVT transmissions are the MOST fuel efficient transmissions made for over the road vehicles. It allows the vehicle to select the best drive ratio for a given circumstance. This transmissions along with lock up torque converters are much more efficient than both manual trans and traditional automatics. CVT transmissions are standard on most new Nissan, Saturn, and most of the hybrid vehicles on the road and probably many more.
@lozoft9
11 жыл бұрын
The real trick is automating the entire thing so that the gear ratio always matches the cyclist's cadence.
@randysmitchell4810
6 ай бұрын
Having used one on my recumbent delta trike for the last 4 years, I absolutely recommend this.
@boo66
16 жыл бұрын
Absolutely brilliant. The manual control because everyone's a different engine of course... but the principle.. Genius!!!! I've often thought of the idea of non-automatic cvt, but most methods until now have been vee-belt based which intrinsically has large frictional losses. Once again... genius!!!
@meandmyevo
14 жыл бұрын
@GLOCKIOMM there is actually plenty of energy loss in a chain and sprocket system, with all the hundreds of tiny "bearings" between the links, and the bearings that the axles have to ride on, this design by itself will definitely increase efficiency in almost any system it is properly applied to.
@swamper777
14 жыл бұрын
This is actually a terrific idea! However, this should definately be used in vehicles, whose automatic transmissions suffer from significant losses in friction. Meanwhile, bicycle chains are VERY efficient, will rule all high-performance bicycles for decades to come.
@ralphrestubog5519
7 жыл бұрын
Press 2 for rotating balls
@teagc
13 жыл бұрын
@SamuraiClinton The fastest human powered vehicle goes over 80mph, it was driven by Sam Whittingham. Combination of recumbent bike, streamlined fairing, and LEGS OF STEEL, all made it possible.
@gblan
16 жыл бұрын
Good god people it's a freakin proof of concept. It's not gonna be on bikes next year. They're just demonstrating it is possible. Give it time and maybe soon enough it'll be smaller, lighter and usable mass market.
@mwehlou
15 жыл бұрын
@500group: boy, am I glad I didn't know this thing couldn't work before I went out for an hour long ride today on my spanking new Crescent Nuvinci. I'm no expert, but there was not the slightest sign of the extra friction you guys claim. No slipping. I never noticed the weight either (but now you said it's so heavy, I'll think about it all the time). For all others, rest assured, it works. The "high friction" if it's there at all, is much too small to be noticed even by my lazy legs.
@meandmyevo
14 жыл бұрын
@MrMeanderthal That is a very good point. Apparently I wasn't really thinking much when I posted that. I was actually considering this for small-engine applications (chainsaws, go-karts, scooters, etc)
@wolterh6
11 жыл бұрын
I love this gadget! I think it would be worthwhile--to ease the understanding of this video--to highlight the circumferences of the sphere each disc is in contact with in real time
@minorlogic
13 жыл бұрын
Scheme of the differential variator. 1. Input power is divided into 2 flow through a differential. 2. Flows give a different ratio (up/down) 3. Combine two power flow through the second differential. Remembering that the planetary gear reducer and at the same time differential, we can build the CVT only with two planetary gears. It seems, and the range and efficiency and capacity of the variator at much higher used in automobiles.
@davidjames9935
8 жыл бұрын
What is the efficiency of this? I want to know for every 100 watts of input power, what is the output power? 85 watts? 90 watts...? Also if they can get a 2:1 ratio on the underdrive side, then why not a 2:1 also on the overdrive side, thus creating a NuVinci 400 (not 360 or 380)? That 4:1 spread of gear ratios might even need 2 front chainrings to select the range needed (high or low) since 0.5 - 2.0 doesn't cover all circumstances. I would want something like 0.5 - 4.0. Also this thing is expensive and doesn't fit all bikes so there are many problems it seems with it. My entire WalMart mountain bike was only about $100 out the door and it has 21 speeds and a gear range (spread) of 3.5:1 which almost matches that of the NuVinci 360 which is 3.6:1. Not sure why this hub cost many hundreds of dollars when I could buy several new bikes for that amount.
@Paul07901
16 жыл бұрын
The Cadillac Fleetwood Cruiser bicycles with the NuVinci Shifter are going for FIVE Hundred Dollars and some change, these days. Check it out, its definitely a sweet looking bicycle.
@MrMeanderthal
14 жыл бұрын
@meandmyevo there is larger versions of this device that will handle larger power input.. not sure how big they get but something in the range of 5 hp is already available..
@ChrisHenniker
12 жыл бұрын
Can the gears on a bike be shifted electronically, via servos, as a full automatic? Just put it into "drive", pedal and forget.
@sisseeboy
13 жыл бұрын
@darkanstormy non newtonian fluid. you can make one with corn starch and water. the kids love that stuff
@Streamflux
17 жыл бұрын
Amazing, this could revolutionize the bike and motor industry.
@meandmyevo
14 жыл бұрын
@MrMeanderthal the design doesn't really limit power, just torque. if you had an engine that produced 15lb-ft of torque at 30,000+ rpm, that some seriously usable power that almost any tiny tranny could handle.
@ArunPaul-Malaysia
11 жыл бұрын
great idea..perhaps a rf fuzzy-logic artificial intelligence device that is continuously communicating with the peddler's 'heart-rate' sensor to monitor variable cadence or level of exertion.
@waghireaditya6753
4 жыл бұрын
How much prise of this year box
@KrunchyJD
14 жыл бұрын
Not a novelty, for bikes, but the problem is weight. See to ride a bike at maximum efficiency you should ideally pedal at a set speed and decrease or increase your moving speed by changing gear. EG spin your pedals at 1.5 times per second and change gear to change bike speed. This is the most efficient way to ride a bike and racing cyclists would love it. The downside is that if the thing weighs 4 kg it is too heavy for a bicycle.
@wits2014
8 жыл бұрын
We might be interested in investing. How efficient is this transmission on AVERAGE? I am not asking peak eff. Average HP in (X) to HP out (Y) . Y/X = ? eff
@DJSI3434
4 жыл бұрын
wits2014 I've heard anywhere from 70 to 95 percent, which is wildly variable. I think it breaks down as towards the extreme low and high ranges the efficiency drops, and increases towards 1:1.
@IdleGod
16 жыл бұрын
Just saw this on Daily Planet. They made a hackjob of explaining how it works. This video answered all of my questions. :)
@Andy-Mesa
17 жыл бұрын
Some mopeds have a 1 speed transmission, some have a 2 speed transmission, and some have a CVT. Motobecanes, (most) Vespas, Peugeots, and Hondas have CVTs.
@m0okasaur
15 жыл бұрын
The shifting of the ball acts like the different size gears... dunno why you don't get the rest, it's simple to me. I just see alot of issues with leaking, and weight. but then I guess the balls could be hollow. although I see the application on heavier vehicles, it seems like alot of device to replace the simplicity of the common gear system on bikes. but I guess its a novelty some might just have to have...
@kurthurtig
15 жыл бұрын
well you also lose a lot from the chain shifter - but its more about the gain you get with the 4kg: continously varying "gears" and most importantly no maintenance! i am actually also very much interested in the use for electric bicycles and motocycles and there 4kg is certainly not much.
@GnomenKlayture
13 жыл бұрын
Wow, the simplicity is beautifully powerful!
@andythedarkone1982
15 жыл бұрын
nice idea, the basic design is simple in mechanical terms, but unless the internal parts are made from very strudy components, it would wear out very quickly!
@flatblackstrat
14 жыл бұрын
@seanwfd Not a copy. Similar in nature though. "power rollers" vs ball bearings. And the way they interact also seems a bit different between the 2.
@47f0
16 жыл бұрын
Special spokes??? It's just a hub - it has spoke holes - lace it and ride. As far as ratios go, the first production units have a range of 350%, which is wider than you think. The efficiency, due to the special transmission fluid is excellent. Of your objections, only the weight, (around 10 lbs) even counts, and given the ability to easily have low-maintenance shifting, I can sacrifice a little weight - contrast that to, say a Nexus hub, at about 3.4 lbs, and the weight difference is even less.
@jarjarbinx79
12 жыл бұрын
you don;t lose power while shifing, plus you dont need to shift. You only need to exert the same amount of power everytime
@williambrodie
14 жыл бұрын
He said CVP at the end i think (2:48) - Am i missing something? And also, I imagine this would let the pedel move if you were resting your weight on it while waiting to go at the lights - unless it has some kind of centrpetal-force-activated gear lock for when your not moving Also, I would prefer a CVT that automatically increased its gear ratio with increased centrifugal force - which I think was the original design goal of CVTs (Am i wrong?) +Compensation for your prefered cadence
@nobodyspecial313
8 жыл бұрын
Simpler to manufacture? No, the "microscopic" space between parts requires very precise machining. Cheaper to manufacture? No, the high contact pressures require specialized alloys to resist deformation. Scalable? Don't make me laugh. This technology has been around for years in the form of toroidal CVTs. They can offer much higher efficiencies than conventional CVTs, but nobody uses them because they are incredibly expensive. The range of ratios is too small for most sports applications, so this would only be useful to a casual riders with deep pockets.
@BobPaul
6 жыл бұрын
Deep pockets? You can get a bike designed around the NuVinci for pretty normal bike prices. The Priority Continuum, for example, pairs a toothed belt (instead of a chain) with the NuVinci hub making a great winter bike; that combo alleviates most of the concerns about road salt. Only $1000, which is cheaper than most of the bikes on the rack at the LBS near me.
it might be good for cars or small engine vehicles like scooters. but i think ur right it will not be good for bikes as there will be some slipping likely and powerloss.
@foxtrotHQ
14 жыл бұрын
so the fluid is like a non-Newtonian fluid? Behaves like a liquid, but solid under pressure/at impact?
@rasmasyean
16 жыл бұрын
So the solidified oil can never slip a little bit from the either the disc or the ball?
@fuzzywzhe
15 жыл бұрын
There talking about a bicycle. The very first question I have, is what is the efficiency? A good and well maintained drive train on a bike is 98% efficient. If this isn't about 95% efficient, nobody will use it except walmart.
@darkanstormy
14 жыл бұрын
@foxtrotHQ Like the "silly-putty" I remember from the science museum.. Pliable like putty if kneaded slowly, but would shatter with sudden impact, then return to being pliable.
@Baziachi
15 жыл бұрын
So if there is a fluid leak at all, the transmission would go slack and be rendered useless, correct? Is there a backup for failure?
@CoyoteBoyUK
16 жыл бұрын
This is an interesting system but I have a few questions: What is the weight of the hub? What shaft ratios are available (min and max)? Its surely not infinitely variable as that would suggest any ratio is available, it is continuously variable, meaning there are no discrete ratios between min and max? What is the diam of the hub? I'd be weilling to give this a try if it came in reasonably priced and wasnt much more than the weight of a comparable cassette/mech combination.
@Andy-Mesa
17 жыл бұрын
I understand the point of CVT. Instead of a set number of gears it's unlimited. But shouldn't it automatically shift by itself? Like the CVT in a moped does.
@Tony1584
15 жыл бұрын
Yeah, I wonder what that transmission fluid will look like after a lot of use.
@GRAHAMAUS
14 жыл бұрын
@meandmyevo Already common in limited slip differentials on cars such as Subaru 4WD models. Silicone based.
@cannissolis
13 жыл бұрын
@minorlogic Maybe, but I expect the losses may be higher than gears so more pedaling energy turned to heat, I would like to know the efficiency, gears run about 98%+ efficient
@0Zerooverload0
14 жыл бұрын
what is the transmision ratio .... not so wide i think...these thing have much smaller range of transmision ratios than the regular shifter...
@BicycleFunk
Жыл бұрын
I have one of these on my cargo bike and it is amazing.
@justinwhite1928
2 ай бұрын
I'd like to ask, how is the smoothness and adjustability to your desired torque/speed? Do you feel you could pedal up a decent hill? Does it take the cargo strain off you? Any input would be helpful, thank you.
@BicycleFunk
2 ай бұрын
@@justinwhite1928 it is very smooth and it is nice because you can adjust on the fly without worrying about snagging your gears. In addition to the NuVinci, I use a Bafang middrive motor for additional power, since the bike is quite heavy and I live up a steep hill. I've meant to make a video about the setup, so maybe I will now. I have nearly 500 miles with this current setup.
@nourbutwatmi
13 жыл бұрын
Not even considering the slippage issue, what's the range on this thing from low to high? From the demo it appears that the range would very limited and if that's the case why would I want this on my bike...unless I live where there is nothing but flat land all arould and in that case I would need only one gear anyway.
@AVCheerst
13 жыл бұрын
Does this not have a big loss?
@Daveed273
12 жыл бұрын
I would love to build a custom buggy with this transmission in it!
@mikemcgln5049
7 жыл бұрын
WOW....................NOW THE PRICE OF BIKES ARE GOING TO COMPETE WITH CARS
@Munchkinross
7 жыл бұрын
I'm convinced I can get more for my bike than I can for my car at the moment.
@timeslowingdown
6 жыл бұрын
They already have been man... but I see your point
@JuryDutySummons
13 жыл бұрын
Well, that's rather interesting. I wonder what advantages it has over a traditional transmission. Is it more durable? Cheaper to make?
@meandmyevo
14 жыл бұрын
@dragonamt The contact fluids used in here are already EXTREMELY difficult to formulate. I cannot imagine(if it's even possible) how complicated and temperamental a fluid with both of those characteristics would be to produce...
@1cor731
14 жыл бұрын
How did they get Dug from "Up" to do the commentary?
@mastenas
7 жыл бұрын
Very similar as nissan toroidal cvt, speciali this fluid wo solidifies when compressed.
@gobacktorussia
13 жыл бұрын
@FranktheBBB ye I see a BIG problem with this, although i have not used this, I would image it has a fair amount of slipping going on, meaning torque transfer is dramatically reduced, which is not good enough for pedaling up hills or using low gears. Is this what you experienced? I wonder how they will attack this problem,
@meandmyevo
14 жыл бұрын
@GRAHAMAUS So... of all the hundreds of Subaru's I've torn into, I have never seen a solidifying traction fluid, nor have I seen a fluid that responds to magnetism in any way. What LSDs on which Subaru vehicles are you talking about?
@cillabee1
15 жыл бұрын
Nice, This is a good idea, give it a few years to work out all the bugs. then it will be in alot of stuff. But it still it is not fuel efficient. like the auto trans compared to a stick. the hydraulic aspect is good for comfort but not efficiency.
@Paul07901
16 жыл бұрын
Yea great; I wonder how easy it is to repair a rear flat tire on a rig like that? I wish they would explain how to go about disassembly of the rear wheel of the frame in the likelihood of a common flat tire. What about the availability of maintenance and repair parts, such as, special shifter and brake cables, pads, oil? Whada you have to do? Make a service call appointment with the dealers for this? LOL.
@radiohobbyist13
7 жыл бұрын
Is it possible to replace the stock balls with larger balls and get more speed?
@whoseline4gp
13 жыл бұрын
I get that it will be smooth in transition, but how is it a CVT if you have to shift?
@rickpaulos
17 жыл бұрын
Mopeds don't have a CVT, they have 1 gear ratio with a centrifical clutch, same as go-carts, chain saws, etc.
@SHSPVR
10 жыл бұрын
To me it about the same as Torotrak or Toroidal in over all on how it works so what so great about that?.
@rocket625
10 жыл бұрын
sounds like it weighs a ton and has limited ratios
@dandcc9192
8 жыл бұрын
+mike nixon Even regular sprockets have limited ratios, and this could actually have better range of ratios, but the problem is that there might be some power loss. Chain drive has nearly 0% power loss. This is dependent on friction, so it's likely that you will lose some power.
@LucasVe208
10 жыл бұрын
idk about these things, still sounds like they could use some work. I think I'll stick to my 21-speed twist shift for now lol but that new KERT flywheel motor sounds very promising lol.
@rasmasyean
16 жыл бұрын
Does this make the rear wheel weigh a lot more than the rest of the bike?
@havenbastion
3 жыл бұрын
Isn't that a non-Newtonian fluid, just like corn starch and water?
@MrMeanderthal
14 жыл бұрын
@meandmyevo so you plan on driving the input shaft with?? this is a replacement for the gears, not the chain...
@CorinGatwood
8 жыл бұрын
Hey can someone tell me if it's bad to get this a little submerged in water? I have this on a trike I just got an gotten some water. I was wondering if it's bad. Can someone please reply?
@mikelo303
10 жыл бұрын
Hi. Any news? Kickstarter maybe?
@boo66
16 жыл бұрын
you still have to shift this - it's infinitely variable - every gear you can imagine.
@Hoobencan
15 жыл бұрын
Thanks for complicating an already mixed up world. That looks like an utter monstrosity. Can't wait to see them all broken down.
@danielkostenko8189
2 жыл бұрын
I'm pretty sure some Divvy bikes have CVT
@joefussy11
12 жыл бұрын
what does it weigh? is it comparable to a mtb hub, cassette, front and rear mech? assuming it'll be run as a single speed chain setup or better yet belt.
@Andy-Mesa
17 жыл бұрын
I don't understand why a CVT has a shifter, isn't that the whole point of a CVT? No shifting?
@cannissolis
13 жыл бұрын
@whoseline4gp Hi, CVT stands for continuously variable transmission not automatic transmission, you can have automatic CVT but it is not inherent in CVT design, hope that helps?
@CrackPedlar
15 жыл бұрын
A comment further down says its no good for bikes- Well, no good YET for 'commuting' bikes- until the weight drops. But a really nice idea for us Downhill racers, where weight isnt an issue, and rear derailleurs can be a pain in the ass when they go wrong/break/snag on stuff/destroy back wheels during a race. ---A bomb-proof version, and i'll pay up gladly.
@mikeandino81
17 жыл бұрын
This design is not THAT new...its principle has been around for a few hundred years...I don't know if it would work for cars because fluid systems are usually (not always) not as effecient as other methods for transferring torque.
@toomuch6523
4 жыл бұрын
Feeling machine! What about down side?
@nicolaiholst
15 жыл бұрын
why not if you can make it for bike so make it bigger or larger ?? so it can will be fit to a Mbike
@minorlogic
13 жыл бұрын
@cannissolis You can find all required info in mech-ingDOTcom/journal/Archive/2011/2/129_Konstantin%20Ivanov.pdf wwwDOTmadbassDOTnarod.ru./ The efficiency is close to efficiency of Bearing on high speed, because all gears is connected.
@jamesmarriott8759
8 жыл бұрын
Aren't CVT's self shifting? I've never seen anyone shift a cvt snowmobile. I'm not sure this is better than the current setup on bikes. If it were I'd see more pro bikes with it.
@trevanthomas7242
8 жыл бұрын
This is for casual bikers who don't know how to shift properly or don't want to put up with the maintenance.
@AndyTrampke
6 жыл бұрын
CVT just means any gearing between its highest and lowest possible ratio rather than set ratios from individual gears. to be considered a CVT it doesn't need to be automatic and just because its a very different design than like a snowmobile CVT doesn't mean it isn't a constantly variable transmission.
@AndyTrampke
6 жыл бұрын
Trevan Thomas tbh its actually very useful for any rider. on a lot of even 18 speed bikes I find in certain conditions that there isn't a perfect gear to be in. sometimes I want a ratio in between 2 of the gears
@andrewjames9510
4 жыл бұрын
So its filled with goop?
@jonathangerbino2621
4 жыл бұрын
It is indeed filled with goop.
@davidnaskah446
17 жыл бұрын
yep someday i did imagine something about that we're in XXI century and no one have invented this mechanism? of course Da Vinci though about that i hope this became a common mechanism fast.
@martseger
15 жыл бұрын
oh come on, why invent a wheel all over again? we have the VARIATOR already, variators can also be made manually controllable, so only really new idea in this nuvincy cvt is that its planetary and probably a little more compact..
@zawzero
13 жыл бұрын
What can i exspect from a supplier called "FAILbrook" on youtube?
@joesfph
15 жыл бұрын
MY GOD I LOVE TECHNOLOGY
@nensolin212
17 жыл бұрын
nyc, hope this adapts to new cars.,
@thefatmoop
13 жыл бұрын
Great transmission. The main problem that I see is that it's hard on the balls (lol). Lot of friction, and probably isnt usable on anything larger than a bicycle Here's an omni tire using same idea, search for Single Omnidrive Platform v.1
@sevish885
14 жыл бұрын
I have to agree - as an engineer i think this will be horribly inefficient. And yes the reliability i see as another issue.
@11JAKEr11
16 жыл бұрын
Great Idea.. but it probably cost an arm and a leg
@v0rt3x86
16 жыл бұрын
That fluid = expensive from what I've heard. That's why they don't use toroidal CVT's in cars vs. belt-driven.
@chrisbarraza7700
10 жыл бұрын
Scalability? How does a regular user change their gear ratio?
@kurtcrafton
10 жыл бұрын
Scalable because you they can add more bearings for different applications. As for how to use it as shown on a bike you would control the ratio with a knob on the handle bar. This method may also work for cheap motorcycles or scooters but in higher class bikes and cars I would assume it would be controlled by a ecu based on throttle position and fuel economy just like the cvt's in cars now.
@sisseeboy
13 жыл бұрын
absolute genius
@pepene93
14 жыл бұрын
this might work on a bike, but i cant see it handling enough power for a car
Пікірлер: 210