Bucket thinks CVTs are awesome, and suggest these videos as well! The Fastest Transmission - ua-cam.com/video/cb6rIZfCuHI/v-deo.html The World's First DCVT - ua-cam.com/video/162BWwkcy5U/v-deo.html Toyota's CVT With Launch Gear - ua-cam.com/video/HanImTejIVM/v-deo.html How CVTs Work (throwback!) - ua-cam.com/video/SQLeKdZWGI4/v-deo.html 5 Things Don't Do CVT - ua-cam.com/video/HSxg97m8lLA/v-deo.html
Bro I love mechanic engineering .Does it have more scope in future after the coming of automation ,robotic, does the scope of mechanical engineering go down? After the digital revolution does robot take work as mechanic in place of human
dude jason, i just had a moment of clarity, why not put a toroidal CVT between the transpission and the rear diff, you can change diff ratios on the fly to suite your driving, having a 4.5:1 for racing, and 2.8:1 for efficiency going home, this way you can keep a manual transmission without having the need for 7 gears for efficiency
I seem to remember a British company called Torotrak, who had something like this umpteen years ago, including the magical fluid. They also had the the output from the "variator", and a direct output from the engine both fed into an elliptical gear setup to allow all possible ratios from a ridiculously long overdrive, down through to neutral (and into an infinite range of reverse ratios). It included electronics to control the whole thing and potentially emulate characteristics of any type of gearbox. I think it was initially aimed at trucks initially. Not sure if light enough to be sporty.
For some odd reason these transmissions are super satisfying to understand. It's a big "ahaaa" effect once you get their concept, and you'll be thinking "Sneaky move there" every once in a while. The normal manual transmission seems like the "hit the problem with a hammer" solution, while this is the backroom smooth talk of engineering. I doubt this made any sense, but I hope someone understands what I'm talking about.
Been an engineer my whole adult life. I understand completely. I get the same feeling from antique pocket watch internals. They're more than just functional, they're elegant, and beautiful. Everything in engineering is about tradeoffs. Some designs better than others. This transmission is just genius. Compare this to the complexity of the 800 miles of fluid channels in a typical automatic transmission. This is simple, and beautiful in its simplicity.
I use to own a 1999 Nissan Gloria with the Extroid CVT. It was the most amazing transmission I've ever driven. Super smooth and great power delivery when needed. Works well with the 3.0L V6 turbo engine.
Anyone else find the oil the most interesting part? Would love to see how it actually changes wear and power transmission compared to other oils and just bear metal contact.
@@EngineeringExplained Does the oil that prevent wear wears out? Because the particles can't be harder than the rollers, otherwise it would scratch the rollers, just like loose metal particles that didn't get caught by the filter in regular oil. But if it's softer it might get deformed under pressure. Not to mention it could just get "sanded down" with each other over time.
@@EngineeringExplained are you not an engineer? Im a mechanical engr here in the philipines and i understand your content here on your page for automotive even though i work in an HVAC industry,, well im amaze if you are not an engr but you can explain it well like an engr,,thanks
I am electrician, but I am wathcing you with s-o much passion,because I am passionated about mechanic. You look like a super smart guy, you know a lot, and you know how to explain that knowlegess! Greetengs from România!
I LOVE YOU AUTOMOTIVE MR ROGERS! lol... You are so awesome at explaining everything. Please do a Mr. Rogers intro on episode. You're just so nice and informative it fits the bill.
@@muskokamike127 right?! He just seems so nice and caring and he's even more educational than the OG. It just fits! I'm 35 and a geek so he's my grown up version of Mr. Rogers
D C i remember going on a trip in the mountains with my altima. And after about 20 miles on nothing but up hill. It went into lip home mode and could only drive 20mph. Never had that problem with my new civic, but i still hate cvts
Instantly recognized the drawing! I had a Dixon zero turn lawn tractor 20 years ago that had this very mechanism. Two steel bells with a friction roller inside each one. The two driver sticks would rotate the friction roller against the bells, up and down and cambered to drive the tractor forward, backward, fast, turn, all that was needed. It transmitted enough torque that I could pop wheelies with the tractor on the driveway. It was an open system, no fluid to cool or lubricate. Tuning it was a pain, but it was a fascinating device - and now I see it on Engineering Explained!
My first car was a DAF 66, with rubber pull belts. Going over 50mph resulted in a call to the AA and an expensive visit to a Volvo dealer for new rubber bands. Apart from that it was a decent reliable car! Steel pushbelts are a big step up and this sounds like something even better. One can think of so many applications for the non-Newtonian lubricating/cooling/force-conducting oil too.
At least 3 bits of genius here. 1st, the basic design that eliminates belts and keeps moving parts count low. 2nd, the use of two back to back to double the torque capacity. 3rd the complete lack of roller to wheel contact virtually eliminating wear. #3 is by far the coolest (at least in my book). As you said, transmitting torque through a fluid is hard. Maybe it's because I'm not a chemist and have no clue how that works, but it's amazing. As always, a great video! Thanks for making this understandable! I do wonder, how they keep the two sets of moving discs in sync between the two sets. If they get out of sync they're going to want to turn the single output gear at different rates and that's not good. I wonder if the mechanism to do that is mechanical, or electrical (computer controlled). Mechanical would seem like a more reliable if more complicated choice.
Electronic control to manage the two. There are sensors in the trunnion so it knows what level it's at and the effective gear ratio, so each side are forced to match.
I'm betting if they wanted to, they could stack the toroid mechanisms to get even more capacity. It would take more room, but the transmission in a Titan is bigger than the one in a Versa.
@@EngineeringExplained oh wow, thank you for getting back so fast. Interesting that it's electronic. Makes sense, less weight, way fewer parts, and given the mass of things involved the response time won't require high end processor.
@@muskokamike127 If you go back and look, you'll see that the 3rd bit of genius was no contact between the rollers and the wheels. The torque is transferred by the oil that is between them. It's the lower right hand 1/4 of the quad pic he drew on the white board. He even talks about how metal to metal contact would cause heat and rapid wear. There is no metal to metal contact between the rollers and the wheels.
i think a manually controlled cvt would be an interesting idea, using something like a third pedal instead of a clutch for the left foot that you lock your foot in and either moves up or down to change gear ratios… imagine being in a race and being able to change to the exact gear ratio you want
You can lol. My 2016 10th gen civic has paddle shifters which pretty much “fakes” the gears. But yeah, you can put it to whatever gear ratio you like. Isn’t a point to it as CVT’s were an idea to have constant output without needing to change gears and always have the right amount of torque when you need it.
My friend's got 200k on his CVT Murano. Unfortunate your Sentra died so young, hope things are better now! Anecdotes also don't tell full stories (like my friend's Murano). Need larger data pools to know if something is good/bad.
@Jason and EE I wonder if Nissan seems to have a less reliable CVT because they sell more vehicles with CVT, since most of their cars have CVT for a long time?
I love learning about these things. The amount of engineering genius that goes into making ICEs match the performance characteristics of electric cars is incredible.
Even without going fully electric it is already possible to make an electric transmission for an ICE engine. That is basically a hybrid where all the power is transmitted through the electric motor, with or without battery storage. It used to be a big weight penalty but not any more with today's tech. So even if ICE stays around for much longer CVTs, manuals and automatics won't. It will just be ICE engines running at their optimum operating point driving a generator. No more clutches, torque converters or differentials either. I doubt we will see any new designs incorporating mechanical transmissions beyond 2025 even if ICE engines will probably be with us at least another 15 to 20 years for various reasons.
I could never understand why people hated/hate the CVT so much. I had a 1998 Nissan bluebird that had a sr20ve and mates to a cvt transmission from the factory. This car was very unassuming but fast. We didn't understand much about cvts so we kept blaming the transmission for going in limp mode. It was over the years with trial and error that we realized that it was the sensors on the transmission that would go bad while the transmission itself was solid as a rock. I love the gas mileage that the cvt gave and I loved how quickly it would gear up and down while in motion. Again the weak point of the cvts are the sensors. Yes the cvt fluid is expensive but it was worth it. And I changed the filter as well at least once a year or sometimes every 6 months. I thrashed on that car like there was no tomorrow and it took it. The Cvt is a marvelous invention. My car was also tiptronic so it mimicked having a 6speed automatic. I dont know if Japan made a different cvt for the USA but I know the cvt that came in the 1998 Nissan bluebird kicked ass.
@@kbatzler Nissan has there own heads up there own asses . It's like the spirit is not there anymore 😒 I got a CVT once 😑ONCE 😑 O,N,C,E ,.NEVER AGAIN 🖐️👍👌😠 . THAT THING NOT JUST TURN ME OFF FROM NISSAN 😐 NOW I THINK I KNOW WHAT A WOMAN FEELS LIKE AFTER BEING RAPE 😡 ITS THAT SERIOUS 😱 😐 😐 . NOPE NEVER AGAIN 🖐️ .MY ADVISE NEVER GET ANY CVTS , UNTIL ITS PERFECTED 👍
@@arkenseth7532 I have to agree with you. My parents went shopping for a new SUV and I suggested against purchasing anything with a CVT. Thankfully they listened. :) They purchased a 2018 Santa Fe Sport.
Almost all off road construction equipment also uses a car. Its a pretty click bait title. Cvts have been around longer then automatic transmissions. Its not even a new concept.
There's a reason this tank works. It's a hydrostatic power split, like a Fendt tractor. Perfect for high torque applications, because torque is transmitted over a much larger area. A fundamentally different principle, and a better one for scalability. The toroidal CVT in contrast transmits torque via single points of contact, hence the extreme sensitivity to fluid properties and tendency to lunch itself if anything goes wrong. Torotrak tried this for years but finally abandoned its own idea and moved onto flywheels. The Nissan seems to combine toroidal CVT with a power split differential gear. This reduces the power through the variator (the tricky bit) and extends the scalability somewhat, but nowhere near enough to get into tank or tractor territory.
CVT is a very general term, there are hundreds of designs and there gonna be even more designs in future. The one which is common in automobile industry is using belt and pulley. This design is only good for small cars and for flat city commuting. It's not good for towing, hauling, off-roading and hilly regions.
Wow, you take a very complex subject and make it simple to understand. Great video -- I probably learned a bit about regular CVTs just watching this one as well, and about how engines work.
Fallbrook launched their NuVinci CVT in 2006 with a similar principle with traction oil, but using balls instead of rollers. I got one on my current high torque e-bike and it works very smooth and nice with 380% range.
Never heard of it so far and I'm blown away. How on earth that kind of an amazing invention didn't set the highest bar as a CVT transmission and become the most used system in the industry. It must have some serious drawbacks right?
Alot of them were put in cars before they worked. Many failed at 100kmiles, there was a class action and nissan replaced a bunch, put money into r&d, and say it works now. Many people are skeptical. Some say they are noisy and fragile but the concept saves gas for sure, and gets smooth acceleration like an electric. Some of them literally have rubber belts inside the transmission. I've heard that regular fluid change helps longevity.
I don't know if this was a glitch in the matrix or whatever but I just learned about toroidal CVTs in general and in specific Nissan's Extroid! So glad you did a video on it!!
"'Toro-idle' 'toroidal' Everyone say it together 'Toroidal' 'Troidal' 'Troidal' 'Troy..' anyway it's not important" hahaha this made my day! P.s. Another great video!
Since there are two toroids and they are pretty small, I'm assuming they could relatively easily get rid of the differential and put a separate toroid on each rear wheel creating the ultimate torque vectoring LSD
That is something I often wondered about conventional pushbelt CVTs, why not just have two smaller CVTs one for each wheel rather than one large one and a diffeential? I really cannot think of any reason not to, at least not any good one. For a 4wd you could even go the whole way with four CVTs, though probably only for on-road not off-road. There would be only one torque converter and reversing gear, only the CVT itself being duplicated (or quadruplicated).
You could build a deferential transmission hybrid out of this allowing for the changing of speed in individual wheels. Use the output disc as a ring gear and have the inputs be separated as the two axels. You could make the outside tire spin faster than the inside tire when turning.
I think the chemists that developed the trans fluid need a lot of credit, being able to specifically shape molecules on a commercial scale sounds really impressive.
I think reliability matters, and CVTs have many points of wear/failure. The pulleys in my Honda wore-out before 100,000. This Nissan CVT has direct metal contact (also some slipping which is inefficient). I’ll take standard and long life gears instead (manual or automatic) .
I remember seeing some Discovery channel documentary when I was a kid, so about ~15 years ago or so, exactly talking about these CVTs, specifically remember the oil was a big part of what made it work, they showed the tests where they broke all the time until they figured out the oil for it
Yes, this is exactly the question. They must have data on this. The engineering department would make them to last 300K miles, but marketing (particularly from the company that bought them) might want a cheaper version that is spec'ed for 100K. This is really how they do stuff. Make money now and be off to another job when the company suffers in the long run. Excellent video by the way. I drive a Maxima with a manual transmission.
I love that you hold of mentioning that they did it 20 years ago until the last second. You had me thinking it was new. This is the kind of clickbait I like.
@@po.russki that's not a simple question to ask on here, it's something to look up. But that basics was teams that hadn't put money into cvt research cried about getting their asses kicked. As cvts are electronically controlled it was considered a electronic driver aid.
2 minutes in and I think "Oh, I get it. That's awesome." Can't wait to be the nerdiest car guy the next time there's a transmission discussion. You never fail to get my neurons firing, sir. Thanks for all you do.
I’ve seen my cousin who is a Nissan mechanic replace or repair so many of Nissan’s current Xtronic CVT but only like a few engine replacement fixes, I really hope this one won’t suffer the same fault their old one does for Nissan’s sake
So has Nissan created a true lifetime transmission here? No bands or clutches to wear out. Perhaps the seals in the hydraulic pistons could wear our but I'd imagine those would be simple to replace. Perhaps without even removing the transmission from the car. Other than that it's all just oiled gear contact. Pretty impressive to improve their design in such a huge way.
That special lubricant remembered me of NuVinci bicycle CVT!... it work with the same principle that at high pressure the lubricant tends to turn solid.
All oils increase viscosity under pressure, it's just not something that's widely discussed. I have books from the mid-50s if not earlier discussing the phenomenon.
Hello Engineering Explained,I love your videos! They help me understand things that are mostly counter-intuitive like,I previously thought that having a stiffer front,softer rear suspension setup on a FWD vehicle would be ideal due to front biased weight distribution on a FWD car. After looking at spring rates of aftermarket coilovers made for FWD cars, I quickly found my self questioning life lmao. Went to check out one of your videos about suspension setups then all of a sudden it struck me...softer end usually have more grip,stiffer end will push the tires to their limits more quickly. It's a constant battle of balance ah the awesomeness of physics! I could imagine all the great tunes on Forza motorsports that i download are done by people just like you! Wish you the best and happy holidays!
I watched a documentary film 15?20? years ago that Nissan was developing this CVT at that moment and made a prototype for F1 application as well as High torque commercial vehicle use. Still remember that Nissan was collaborating with oil company to make special oil. Oil characteristic was explained as It flow and act as normal cvt oil but when it is applied with high pressure between metal, the characteristic of oil changed, its molecules packed and the film strength is increased dramatically. I thought Nissan dropped the project but they didn't. very impressive. well done Nissan. Now you guys need to make CVT more reliable, please....
So, they basically bought old Torotrak patent, introduced about 15-16 years ago... I do hope they solved the issue with special oil formulation, required for those rotating 'disks' to keep a good contact with each other.
Interesting info....This deserves further research, as I have been following closely car industry since '82-'83 and haven't really heard about Nissan using this type of transmission. Funnily enough,if memory serves me right, Torotrak company was at it's peak in '01-'03, promising very good results with their toroidoal tranny, even announcing a future contract with big car manufacturer. And then their stock went down in a year , no real connections with big car companies materialized and they were looking in applying this principles in other type of applications, Haven't followed them since (personally , I found Antonov transmission did seem more promising, as well as Zeroshift...), but was quite surprise to find their web domain invalid, after I had seen this video about new Nissan transmission...strange coincidence...
Holy crap the guy who created this is such an engineering genius. But as all engineering feats... nothing beats the emotional experience of what we ACTUALLY enjoy, which is a manual trans :p
he literally explained how it allows for complete torque transfer if you watch and listen also torque converters don't rob power like they used to. look at the Koenigsegg the fastest accelerating car in the world has no transmission and only a torque converter
@@the-hawkstalk1205 It also has an 1100hp V8 aided by about 700hp of electric drive. You don't need a transmission when you have so much power at all times that your car pulls as hard in 7th gear as other cars do in 1st.
@@the-hawkstalk1205 Well, that Koengisegg you mentioned also loses 300 HP in the drivetrain so it's far from being the perfect example of an efficient drivetrain.
Yeah it CONVERTS the hp into torque. Lost of hp but gains in torque. This is exactly what it is built for and there are not much actual power losses to current torque convertors and that ia my point. Also this really had nothing to do with having no trans just the TC
actually, a torque converter multiplies torque while it loses some horse power. thats why automatic transmissions have the same torque rating and lower horsepower when using identical motors as compared to a manual transmission...an automatic can transfer a lot of torque when the output shaft is at zero rpm like when you step on the brakes and hit the gas at the same time while the standard transmission is busy burning clutch or feathering its way into power. or just burning rubber if you want to side step the clutch
Epicyclic gears and torque converter do the job just fine. the TC is only used when pulling away from standstill. During gear shifts, the epicyclics are slipped in/out with individual clutches. The big gain with epicyclic gears is straight cut gears with three or four planet gears on each sun/annulus assembly. High torque and no noise.
I drive an '05 Maxima with 178K miles, the car is a beast. But the transmission is manual of course. I will never sell this car. If you want to see a full teardown and diagnostic appraisal of a Nissan CVT, look on YT for "pine hollow auto diagnostics". Stay tuned until the last piece is torn down. They are using ball bearings to attempt to hold up in a "shear" scenario, or in other words, ball bearings to stop motion rather than transfer motion. It is truly a BAD design.
@@kefsound 1 gallon is 4 quarts 1 USA gallon is 3.78 liters. FYI one Imperial gallon is 5 USA quarts. Going into Canada used to be interesting, liters of gasolene now.
I had the idea for a cvt when I was 15. I had a different design idea for mine (conical gear with a runner gear) I'm glad someone came up with a working design! I'm sure this will be the future of transmissions
Excellent presentation of explaining this tech. I'm not a fan of CVTs and have many qustions in trying to keep an open mind. But you've answered every question I thought of. Good job. I appreciate your knowledge and enjoy your videos.
You're normally the looud guy at the let's watch the Superbowl at John & Becky's, right? Don't answer, because I know I am, without ever having met you - just like you rendered an opinion without any evidence,other than a bad experience with a car that YOU drove.
@@Adrian_Nel Evidence, you mean like the class action action lawsuit against Nissan due to their CVT's going out? Jatco also makes the CVT's that some models in Fiat owned brands like Chrysler/Dodge use and are notorious for premature failures.
@@Adrian_Nel those CVTs all have full-time metal on metal slide friction, which you normally don't have when you use regular AT or MT, which is why AT or MT being used on highway may last for a million kms and CVT not
when he said "hello everyone..." i looked at the board and thought to myself "this is genius!". So, congrats to Nissan. This CVT not only can handle more loads but it'll be far more durable
whiteboard is too large, can't see. Edit: just kidding. Shouldn't the power rollers be on opposite settings at all time, because the forces go in a circle?
I know this is 2 years old but Nissan CVTs are still failing by the bucket load and they have been since they were introduced in the 90s Primera. I regularly see them at below 100k km (60k miles) and sometimes even half that. I hope this system is a lot more reliable.
You must mean automotive high torque CVT. I work in the industrial sector and work on 125KW Generators on 7L GM V8 prime movers. They've got very tough CVT between the engine and the generator. Makes for longer than normal generators, but the speed regulation on high demand applications is awesome.
Nissan promising to build a good CVT is like an alcoholic promising to stop drinking. I mean It's not impossible but rather just unlikely occurrence. Maybe Nissan gets it right this time, only time/mileage will tell.
I wanna see a manual CVT. There's no reason you couldn't hook up the power roller angle to a lever and stick it into the cabin, allowing you to smoothly "adjust" gear ratio to your liking. Kinda like the prop pitch lever on a propeller plane. And then hook it up to a foot clutch instead of a torque converter. I'd be happy as ever.
CVT would simply be less reliable than a stick shift and have no real advantage. The only reason a CVT could be better than a stick shift is because it can constantly stay at perfect RPM. As soon as you control that manually it's not going to be at the perfect RPM anyway and you could just as well not have a CVT. Also clutch would only be for starting, shifting does not require use of a clutch.
@@FranseFrikandel The foot clutch for starting was my intention Also I presume the controllable CVT lever would just be a fun thing; not necessarily for efficiency or power, similar to how modern manuals really don't hold a candle to good automatics, other than fun factor. Operating it would be almost identical to operating the prop pitch lever on a plane; it certainly isn't impossible (or hard at all) to maintain excellent efficiency or power
Their current CVT"s suck and unless this new ones can go over thousands of miles without breaking down even with proper fluid change then their CVT's won't change anyone's mind yet.
Bucket thinks CVTs are awesome, and suggest these videos as well!
The Fastest Transmission - ua-cam.com/video/cb6rIZfCuHI/v-deo.html
The World's First DCVT - ua-cam.com/video/162BWwkcy5U/v-deo.html
Toyota's CVT With Launch Gear - ua-cam.com/video/HanImTejIVM/v-deo.html
How CVTs Work (throwback!) - ua-cam.com/video/SQLeKdZWGI4/v-deo.html
5 Things Don't Do CVT - ua-cam.com/video/HSxg97m8lLA/v-deo.html
Bro I love mechanic engineering .Does it have more scope in future after the coming of automation ,robotic, does the scope of mechanical engineering go down? After the digital revolution does robot take work as mechanic in place of human
dude jason, i just had a moment of clarity, why not put a toroidal CVT between the transpission and the rear diff, you can change diff ratios on the fly to suite your driving, having a 4.5:1 for racing, and 2.8:1 for efficiency going home, this way you can keep a manual transmission without having the need for 7 gears for efficiency
Engineering Explained Cool, but how much does it weight compared to other types of transmissions?
Also why a regular transmission oil is not good? It was created for the very same purpose, high torque metal to metal lubrication.
I seem to remember a British company called Torotrak, who had something like this umpteen years ago, including the magical fluid. They also had the the output from the "variator", and a direct output from the engine both fed into an elliptical gear setup to allow all possible ratios from a ridiculously long overdrive, down through to neutral (and into an infinite range of reverse ratios). It included electronics to control the whole thing and potentially emulate characteristics of any type of gearbox. I think it was initially aimed at trucks initially. Not sure if light enough to be sporty.
For some odd reason these transmissions are super satisfying to understand. It's a big "ahaaa" effect once you get their concept, and you'll be thinking "Sneaky move there" every once in a while. The normal manual transmission seems like the "hit the problem with a hammer" solution, while this is the backroom smooth talk of engineering.
I doubt this made any sense, but I hope someone understands what I'm talking about.
I hear ya.
I understand, it makes sense. This is a more complex but not a more complex fix for the transmission problem
GermanTopGameTV you said it better than I could, if that means anything
Been an engineer my whole adult life. I understand completely. I get the same feeling from antique pocket watch internals. They're more than just functional, they're elegant, and beautiful.
Everything in engineering is about tradeoffs. Some designs better than others. This transmission is just genius. Compare this to the complexity of the 800 miles of fluid channels in a typical automatic transmission. This is simple, and beautiful in its simplicity.
Dont worry I too have autism
I use to own a 1999 Nissan Gloria with the Extroid CVT.
It was the most amazing transmission I've ever driven.
Super smooth and great power delivery when needed.
Works well with the 3.0L V6 turbo engine.
Anyone else find the oil the most interesting part? Would love to see how it actually changes wear and power transmission compared to other oils and just bear metal contact.
Quite cool!
@@EngineeringExplained Does the oil that prevent wear wears out? Because the particles can't be harder than the rollers, otherwise it would scratch the rollers, just like loose metal particles that didn't get caught by the filter in regular oil. But if it's softer it might get deformed under pressure. Not to mention it could just get "sanded down" with each other over time.
Oo, non-newtonion oil! So much clever.
Bear metal...sounds tough!
@@joshlemons3662 i prefer virtual environments, they have better security :)
Surprisingly well explained to a non-engineer - good job! The whiteboard appeared daunting to me until you started describing what's on it :)
Happy to hear it, I appreciate you watching! :)
@@EngineeringExplained are you not an engineer? Im a mechanical engr here in the philipines and i understand your content here on your page for automotive even though i work in an HVAC industry,, well im amaze if you are not an engr but you can explain it well like an engr,,thanks
I am electrician, but I am wathcing you with s-o much passion,because I am passionated about mechanic.
You look like a super smart guy, you know a lot, and you know how to explain that knowlegess!
Greetengs from România!
*rubber drink coasters not included with purchase of CVT
But they come in handy for beverages while repairs are being made...
"FOR DEMONSTRATION PURPOSES ONLY"
I LOVE YOU AUTOMOTIVE MR ROGERS! lol... You are so awesome at explaining everything. Please do a Mr. Rogers intro on episode. You're just so nice and informative it fits the bill.
Ha, thanks for the kind words! Mr. Rogers, what a legend!
@@muskokamike127 right?! He just seems so nice and caring and he's even more educational than the OG. It just fits! I'm 35 and a geek so he's my grown up version of Mr. Rogers
aaak! now i cant unsee it!
They also created a cvt that is terribly built too
TLE0622 IPL 👍🏼👍🏼😂👍🏼😂
Nissan and good robust design haven't met in decades.
D C i remember going on a trip in the mountains with my altima. And after about 20 miles on nothing but up hill. It went into lip home mode and could only drive 20mph. Never had that problem with my new civic, but i still hate cvts
D C i often wonder if the Renault alliance-screwed Nissans reliability.
CVT = dump aka rich garbage ,, hell no 😐😑 hate CVTs
Someone finally made a car with the friction disc drive from my Sears lawn tractor! Yay!
LOL, I had one of those! Worked fine till the rubber separated from the drive disc (2 or 3 years).😜
So good for doing wheelies hey. Reverse, Pull back, Slam in forward, WHEELIE!!!
Exactly what I was thinking.
Its not a friction disk..
@Crazylalalala: It is, in spirit.
buckle up boys a CVT GTR is coming!!!
would certainly fit with the futuristic concept shown at Goodwood
Will definitely be in a new Z car or the Q60 coupe
Would be fun to see a CVT GTR race a Tesla, just to see who's going into "safe mode" first.
No shift points means, no delay and lag between gears means, Hyper Godzilla on Steroids.
@@anchorbait6662 "oh god no"
as if the r35 is a stick shift 😂.
Nissan know their big toy and what suits it the best
Instantly recognized the drawing! I had a Dixon zero turn lawn tractor 20 years ago that had this very mechanism. Two steel bells with a friction roller inside each one. The two driver sticks would rotate the friction roller against the bells, up and down and cambered to drive the tractor forward, backward, fast, turn, all that was needed. It transmitted enough torque that I could pop wheelies with the tractor on the driveway. It was an open system, no fluid to cool or lubricate. Tuning it was a pain, but it was a fascinating device - and now I see it on Engineering Explained!
Bucket says, "drop me filthy human!" +1 for bucket
MOAR
BUCKET
My first car was a DAF 66, with rubber pull belts. Going over 50mph resulted in a call to the AA and an expensive visit to a Volvo dealer for new rubber bands. Apart from that it was a decent reliable car! Steel pushbelts are a big step up and this sounds like something even better. One can think of so many applications for the non-Newtonian lubricating/cooling/force-conducting oil too.
Rocket science, for the average person lol. This guy is great, nonetheless.
He's seriously the best. He can explain the most complex mechanism to where even the most simple person can understand. A true gift.
I knew how they worked but he explains it in a 'easy to learn' format. Nicely done.
Thanks!
At least 3 bits of genius here. 1st, the basic design that eliminates belts and keeps moving parts count low. 2nd, the use of two back to back to double the torque capacity. 3rd the complete lack of roller to wheel contact virtually eliminating wear. #3 is by far the coolest (at least in my book). As you said, transmitting torque through a fluid is hard. Maybe it's because I'm not a chemist and have no clue how that works, but it's amazing. As always, a great video! Thanks for making this understandable!
I do wonder, how they keep the two sets of moving discs in sync between the two sets. If they get out of sync they're going to want to turn the single output gear at different rates and that's not good. I wonder if the mechanism to do that is mechanical, or electrical (computer controlled). Mechanical would seem like a more reliable if more complicated choice.
Electronic control to manage the two. There are sensors in the trunnion so it knows what level it's at and the effective gear ratio, so each side are forced to match.
I'm betting if they wanted to, they could stack the toroid mechanisms to get even more capacity. It would take more room, but the transmission in a Titan is bigger than the one in a Versa.
I never heard of the Extroid CVT before. Looks like a neat design.
@@EngineeringExplained oh wow, thank you for getting back so fast. Interesting that it's electronic. Makes sense, less weight, way fewer parts, and given the mass of things involved the response time won't require high end processor.
@@muskokamike127 If you go back and look, you'll see that the 3rd bit of genius was no contact between the rollers and the wheels. The torque is transferred by the oil that is between them. It's the lower right hand 1/4 of the quad pic he drew on the white board. He even talks about how metal to metal contact would cause heat and rapid wear. There is no metal to metal contact between the rollers and the wheels.
i think a manually controlled cvt would be an interesting idea, using something like a third pedal instead of a clutch for the left foot that you lock your foot in and either moves up or down to change gear ratios… imagine being in a race and being able to change to the exact gear ratio you want
You can lol. My 2016 10th gen civic has paddle shifters which pretty much “fakes” the gears. But yeah, you can put it to whatever gear ratio you like. Isn’t a point to it as CVT’s were an idea to have constant output without needing to change gears and always have the right amount of torque when you need it.
What I would do is have it hold a fixed RPM, and then manipulate gearing for speed.
How about Nissan create a CVT that doesn’t die at 18,000 miles like the one in my Sentra did before I got rid of it.
My friend's got 200k on his CVT Murano. Unfortunate your Sentra died so young, hope things are better now! Anecdotes also don't tell full stories (like my friend's Murano). Need larger data pools to know if something is good/bad.
Or the put 3 pedals back.
@Jason and EE I wonder if Nissan seems to have a less reliable CVT because they sell more vehicles with CVT, since most of their cars have CVT for a long time?
I think the second coming will happen before Nissan dose that 😐.
We have a Murano thats done 380,000 kms, still runs strong although CVTs are irritating to drive.
That is the most beautiful transmission I’ve ever seen, it’s absolutely the future.
I love Nissan.
Infinite ratio’s with a dozen parts.
I love learning about these things. The amount of engineering genius that goes into making ICEs match the performance characteristics of electric cars is incredible.
Ryan Boyer yup, the last ice cars will be great.
Yep and that only proves how electric will inevitably take over
Even without going fully electric it is already possible to make an electric transmission for an ICE engine. That is basically a hybrid where all the power is transmitted through the electric motor, with or without battery storage. It used to be a big weight penalty but not any more with today's tech.
So even if ICE stays around for much longer CVTs, manuals and automatics won't. It will just be ICE engines running at their optimum operating point driving a generator. No more clutches, torque converters or differentials either.
I doubt we will see any new designs incorporating mechanical transmissions beyond 2025 even if ICE engines will probably be with us at least another 15 to 20 years for various reasons.
I could never understand why people hated/hate the CVT so much. I had a 1998 Nissan bluebird that had a sr20ve and mates to a cvt transmission from the factory. This car was very unassuming but fast. We didn't understand much about cvts so we kept blaming the transmission for going in limp mode. It was over the years with trial and error that we realized that it was the sensors on the transmission that would go bad while the transmission itself was solid as a rock.
I love the gas mileage that the cvt gave and I loved how quickly it would gear up and down while in motion. Again the weak point of the cvts are the sensors.
Yes the cvt fluid is expensive but it was worth it. And I changed the filter as well at least once a year or sometimes every 6 months.
I thrashed on that car like there was no tomorrow and it took it.
The Cvt is a marvelous invention. My car was also tiptronic so it mimicked having a 6speed automatic.
I dont know if Japan made a different cvt for the USA but I know the cvt that came in the 1998 Nissan bluebird kicked ass.
It's got toroids, it's got trunnions. All it needs is marzal vanes and a dingle arm.
Greasyspleen Don’t forget the schleem, dinglepop, fleeb juice, spit, and chumbles for the plumbus
Thankfully Chrysler is outsourcing their patented prefamulated amulite to Nissan to make their logarithmic casting.
The trunions probably run efficiently on those sperving bearings
Nissan makes poor Brownian motion producers, and their Atomic Vector Plotters are substandard
I saw a toroid torque converter at the carnival, and I also said their was an alternator on it.
Excellent , i have been watching you for years since you explained 4wd,awd, and diff locks ,bless you god .
Their current CVT is a disaster....I hope this one is better.
if it is made by jatco like all their other CVT transmissions well we know how its going to end
@@word1901 lol yep trash 😂
I would assume since Nissan owns 75% of Jatco that it definitely is.
@@kbatzler Nissan has there own heads up there own asses . It's like the spirit is not there anymore 😒 I got a CVT once 😑ONCE 😑 O,N,C,E ,.NEVER AGAIN 🖐️👍👌😠 . THAT THING NOT JUST TURN ME OFF FROM NISSAN 😐 NOW I THINK I KNOW WHAT A WOMAN FEELS LIKE AFTER BEING RAPE 😡 ITS THAT SERIOUS 😱 😐 😐 . NOPE NEVER AGAIN 🖐️ .MY ADVISE NEVER GET ANY CVTS , UNTIL ITS PERFECTED 👍
@@arkenseth7532 I have to agree with you. My parents went shopping for a new SUV and I suggested against purchasing anything with a CVT. Thankfully they listened. :) They purchased a 2018 Santa Fe Sport.
Best demonstration of the toroidal cvt I’ve seen. It’s beautifully simple to operate and very difficult to explain.
High torque CVT... 44 tonnes heavy Japanese Type 10 tank uses CVT and it's capable of driving at 70 km/h both forward and in reverse.
Probably because it is Japanese made and Renault was not let anywhere near it. I guess.😂
Almost all off road construction equipment also uses a car.
Its a pretty click bait title. Cvts have been around longer then automatic transmissions. Its not even a new concept.
There's a reason this tank works. It's a hydrostatic power split, like a Fendt tractor. Perfect for high torque applications, because torque is transmitted over a much larger area. A fundamentally different principle, and a better one for scalability.
The toroidal CVT in contrast transmits torque via single points of contact, hence the extreme sensitivity to fluid properties and tendency to lunch itself if anything goes wrong. Torotrak tried this for years but finally abandoned its own idea and moved onto flywheels.
The Nissan seems to combine toroidal CVT with a power split differential gear. This reduces the power through the variator (the tricky bit) and extends the scalability somewhat, but nowhere near enough to get into tank or tractor territory.
CVT is a very general term, there are hundreds of designs and there gonna be even more designs in future. The one which is common in automobile industry is using belt and pulley. This design is only good for small cars and for flat city commuting. It's not good for towing, hauling, off-roading and hilly regions.
I have no idea how those hydraulic cvts work... Its black magic to me
Wow, you take a very complex subject and make it simple to understand. Great video -- I probably learned a bit about regular CVTs just watching this one as well, and about how engines work.
Fallbrook launched their NuVinci CVT in 2006 with a similar principle with traction oil, but using balls instead of rollers. I got one on my current high torque e-bike and it works very smooth and nice with 380% range.
Dana licensed that for the Variglide transmission.
Never heard of it so far and I'm blown away. How on earth that kind of an amazing invention didn't set the highest bar as a CVT transmission and become the most used system in the industry. It must have some serious drawbacks right?
Alot of them were put in cars before they worked. Many failed at 100kmiles, there was a class action and nissan replaced a bunch, put money into r&d, and say it works now. Many people are skeptical. Some say they are noisy and fragile but the concept saves gas for sure, and gets smooth acceleration like an electric. Some of them literally have rubber belts inside the transmission. I've heard that regular fluid change helps longevity.
wow ur just on time, ive started learnin this in skool
Once again, another feat of mechanical engineering design. Just amazing. I'm envious of the intelligence of the people behind designs like this
The CVT is an engineering marvel
@Cody Dillashaw yup, seems like the norm now.
Great job! I remember the JDM V35 Skyline RWD Sedan (G35 in US) offered an Extroid CVT back in the early 2000s.
Cvt's have been in tractors, snowmobiles and semi's longer than I've been alive. everyone loves snowmobiles.
I learned a new word. Although I can't pronounce it very well😂
Toroidal! Resembling a torus.
I just thought maybe he was German or something and couldn't say squirrel either.🤣
I bet you can pronounce sushi though
This looks like it will be durable and easy to fix.
cat: put me doown
Yep that what cat was really saying.
I don't know if this was a glitch in the matrix or whatever but I just learned about toroidal CVTs in general and in specific Nissan's Extroid! So glad you did a video on it!!
"Kajiit has no interest in your spinning donuts. Now let me down, smooth skin."
These are by far the best whiteboard illustrations as of yet. Funny comparing this with where it all startede.
"'Toro-idle' 'toroidal' Everyone say it together 'Toroidal' 'Troidal' 'Troidal' 'Troy..' anyway it's not important" hahaha this made my day! P.s. Another great video!
Nope, it's "tro-oidal."
tor-ROID-ul
In German you say: Toro-i-dal the i pronounced like 2 e
What a fantastic design! I hope it works as good as it looks!
Since there are two toroids and they are pretty small, I'm assuming they could relatively easily get rid of the differential and put a separate toroid on each rear wheel creating the ultimate torque vectoring LSD
Would help make weight distribution easier on a front-engine vehicle as well
That is something I often wondered about conventional pushbelt CVTs, why not just have two smaller CVTs one for each wheel rather than one large one and a diffeential? I really cannot think of any reason not to, at least not any good one.
For a 4wd you could even go the whole way with four CVTs, though probably only for on-road not off-road.
There would be only one torque converter and reversing gear, only the CVT itself being duplicated (or quadruplicated).
You could build a deferential transmission hybrid out of this allowing for the changing of speed in individual wheels.
Use the output disc as a ring gear and have the inputs be separated as the two axels. You could make the outside tire spin faster than the inside tire when turning.
Oh boy, Nissan doesn’t have the best reliability lately and now they have a fancy new engine with more moving parts and a fancy new CVT.
Did you see the video? This transmission is from 1999.
Not just released. It was in a 1999 vehicle. Watch the video.
I think the chemists that developed the trans fluid need a lot of credit, being able to specifically shape molecules on a commercial scale sounds really impressive.
I think reliability matters, and CVTs have many points of wear/failure. The pulleys in my Honda wore-out before 100,000. This Nissan CVT has direct metal contact (also some slipping which is inefficient). I’ll take standard and long life gears instead (manual or automatic)
.
I have a CVT in my Toyota ractis 500,000 miles no issues at all... Only did fluid change once, every story is different
I remember seeing some Discovery channel documentary when I was a kid, so about ~15 years ago or so, exactly talking about these CVTs, specifically remember the oil was a big part of what made it work, they showed the tests where they broke all the time until they figured out the oil for it
*Looks Pretty Cool!!*
_Wounder how they will hold up over the years_
Been out since '99! Probably some out there to see how they're doing.
Yes, this is exactly the question. They must have data on this. The engineering department would make them to last 300K miles, but marketing (particularly from the company that bought them) might want a cheaper version that is spec'ed for 100K. This is really how they do stuff. Make money now and be off to another job when the company suffers in the long run. Excellent video by the way. I drive a Maxima with a manual transmission.
I did a little research. The Cedric CVTs were only available on some high end models. Every other Cedric got a 4 speed autobox.
I love that you hold of mentioning that they did it 20 years ago until the last second. You had me thinking it was new. This is the kind of clickbait I like.
if only CVTs hadn't been banned in F1...
Haha, the racing would definitely sound weird. Everyone at 15,000 RPM constantly.
That would be ear bleeding. The crowd would need earplugs. Lol
Why did they ban it?
@@po.russki FIA doesn't like new tech that drastically changes everything
@@po.russki that's not a simple question to ask on here, it's something to look up. But that basics was teams that hadn't put money into cvt research cried about getting their asses kicked. As cvts are electronically controlled it was considered a electronic driver aid.
2 minutes in and I think "Oh, I get it. That's awesome." Can't wait to be the nerdiest car guy the next time there's a transmission discussion. You never fail to get my neurons firing, sir. Thanks for all you do.
@Engineering Explained Loved the video, but please, the next time you do a video like this, let me 3D print props for you.
This is pretty brilliant, I'm looking forward to seeing how this transmission plays out.
Bucket says: "I dont like Nissan CVTs at all."
He's feisty haha.
The fluid reminds me of the NuVinci n360 hub on my bike. I've been pushing 2hp through that sucker for a couple years, and it takes it like a champ!
So they pretty much invented a snowblower transmission for cars ;)
I’ve seen my cousin who is a Nissan mechanic replace or repair so many of Nissan’s current Xtronic CVT but only like a few engine replacement fixes,
I really hope this one won’t suffer the same fault their old one does for Nissan’s sake
So has Nissan created a true lifetime transmission here? No bands or clutches to wear out. Perhaps the seals in the hydraulic pistons could wear our but I'd imagine those would be simple to replace. Perhaps without even removing the transmission from the car. Other than that it's all just oiled gear contact. Pretty impressive to improve their design in such a huge way.
it's a design from the 90s that they no longer employ afaik
@@DylanTK Honda tried it, was forced to abandon it, due to reliability issues.
@@vincentrobinette1507 what were those reliability issues if I may ask?
That special lubricant remembered me of NuVinci bicycle CVT!...
it work with the same principle that at high pressure the lubricant tends to turn solid.
All oils increase viscosity under pressure, it's just not something that's widely discussed. I have books from the mid-50s if not earlier discussing the phenomenon.
"Troi-, Tori-, tor-, anyways it's important!" 😂
Hello Engineering Explained,I love your videos! They help me understand things that are mostly counter-intuitive like,I previously thought that having a stiffer front,softer rear suspension setup on a FWD vehicle would be ideal due to front biased weight distribution on a FWD car. After looking at spring rates of aftermarket coilovers made for FWD cars, I quickly found my self questioning life lmao. Went to check out one of your videos about suspension setups then all of a sudden it struck me...softer end usually have more grip,stiffer end will push the tires to their limits more quickly. It's a constant battle of balance ah the awesomeness of physics! I could imagine all the great tunes on Forza motorsports that i download are done by people just like you! Wish you the best and happy holidays!
Nissan sure loves the CVT, don't they?
I wonder if this will be going into the next Z model, or if there's a next Z model to begin with.
Elton Thomas dont b surprise
A CVT on a Z? Yuck!
I watched a documentary film 15?20? years ago that Nissan was developing this CVT at that moment and made a prototype for F1 application as well as High torque commercial vehicle use.
Still remember that Nissan was collaborating with oil company to make special oil. Oil characteristic was explained as It flow and act as normal cvt oil but when it is applied with high pressure between metal, the characteristic of oil changed, its molecules packed and the film strength is increased dramatically.
I thought Nissan dropped the project but they didn't. very impressive. well done Nissan. Now you guys need to make CVT more reliable, please....
I'll check back in a couple years, that's how long it will take for this new CVT to prove itself good or bad.
I love this idea. It is easier to understand than an 7, 8, or 9 speed transmission. It is a great idea for cars (definitely not for truck).
1999??? I thought it this is new. Why isn't this mainstream yet?
Probably because they didn't have the material, like that fancy new oil, to make it work well
@@coldblue32E it's already in 1999 cedric
I own a '15 Pathfinder with 55k miles...It's my daily driver. It's dealer maintained. No problems with the CVT, yet.
So, they basically bought old Torotrak patent, introduced about 15-16 years ago... I do hope they solved the issue with special oil formulation, required for those rotating 'disks' to keep a good contact with each other.
they actually developed this in the early to mid 90s and it debuted in the late 90s in Japan. Jason is covering it now for whatever reason...
Interesting info....This deserves further research, as I have been following closely car industry since '82-'83 and haven't really heard about Nissan using this type of transmission. Funnily enough,if memory serves me right, Torotrak company was at it's peak in '01-'03, promising very good results with their toroidoal tranny, even announcing a future contract with big car manufacturer. And then their stock went down in a year , no real connections with big car companies materialized and they were looking in applying this principles in other type of applications, Haven't followed them since (personally , I found Antonov transmission did seem more promising, as well as Zeroshift...), but was quite surprise to find their web domain invalid, after I had seen this video about new Nissan transmission...strange coincidence...
Holy crap the guy who created this is such an engineering genius. But as all engineering feats... nothing beats the emotional experience of what we ACTUALLY enjoy, which is a manual trans :p
I agree. If it's a sports car, shifting is a major part of the driving experience for me.
I bet that super-duper oil steals the power like the torque convertor does
he literally explained how it allows for complete torque transfer if you watch and listen also torque converters don't rob power like they used to. look at the Koenigsegg the fastest accelerating car in the world has no transmission and only a torque converter
@@the-hawkstalk1205 It also has an 1100hp V8 aided by about 700hp of electric drive.
You don't need a transmission when you have so much power at all times that your car pulls as hard in 7th gear as other cars do in 1st.
@@the-hawkstalk1205 Well, that Koengisegg you mentioned also loses 300 HP in the drivetrain so it's far from being the perfect example of an efficient drivetrain.
Yeah it CONVERTS the hp into torque. Lost of hp but gains in torque. This is exactly what it is built for and there are not much actual power losses to current torque convertors and that ia my point. Also this really had nothing to do with having no trans just the TC
actually, a torque converter multiplies torque while it loses some horse power. thats why automatic transmissions have the same torque rating and lower horsepower when using identical motors as compared to a manual transmission...an automatic can transfer a lot of torque when the output shaft is at zero rpm like when you step on the brakes and hit the gas at the same time while the standard transmission is busy burning clutch or feathering its way into power. or just burning rubber if you want to side step the clutch
Epicyclic gears and torque converter do the job just fine. the TC is only used when pulling away from standstill. During gear shifts, the epicyclics are slipped in/out with individual clutches. The big gain with epicyclic gears is straight cut gears with three or four planet gears on each sun/annulus assembly. High torque and no noise.
I have a 2017 Maxima and all these salty “car enthusiasts” actually are starting to get me wondering how long this cvt will last
My 2011 max is at 167k
Got a friend with an old Murano at 200k+. Keep up with all your maintenance intervals, cars can last a long long time.
My 14 Altima lasted 56k miles. Wife 08 rogue lasted 60k miles
My employer (big retail chain) gave the area managers CVT Altimas for company leased cars and their CVTs are dying around 50 to 75k miles.
I drive an '05 Maxima with 178K miles, the car is a beast. But the transmission is manual of course. I will never sell this car. If you want to see a full teardown and diagnostic appraisal of a Nissan CVT, look on YT for "pine hollow auto diagnostics". Stay tuned until the last piece is torn down. They are using ball bearings to attempt to hold up in a "shear" scenario, or in other words, ball bearings to stop motion rather than transfer motion. It is truly a BAD design.
Damn good job you've done there.
Love you videos.
Thanks from Japan.
The oil sounds like it’s the most expensive part. Probably 1 quart for $100 😂
Mike T $65 for 4 litres in Australia, in America it’s probably half that price.
@@joepeluso3864 No Cedrics here. Any other vehicle use this Toroidal CVT?
$500+ for Nissan KTF-1 CVT fluid
"quart"?
@@kefsound 1 gallon is 4 quarts 1 USA gallon is 3.78 liters. FYI one Imperial gallon is 5 USA quarts. Going into Canada used to be interesting, liters of gasolene now.
NISSAN loves watching Jasons videos!
want: a mazda skyactiv-X with a nisan toroidal transmission
I had the idea for a cvt when I was 15. I had a different design idea for mine (conical gear with a runner gear) I'm glad someone came up with a working design! I'm sure this will be the future of transmissions
as soon as the cat herd cvt he was like im outta here lol
@@zporadik5651 And Nissan's horrible track record with their CVT's that resulted in them losing a class action lawsuit.
Excellent presentation of explaining this tech. I'm not a fan of CVTs and have many qustions in trying to keep an open mind. But you've answered every question I thought of. Good job. I appreciate your knowledge and enjoy your videos.
If its made by JATCO its trash. Like all nissan CVTs
You're normally the looud guy at the let's watch the Superbowl at John & Becky's, right? Don't answer, because I know I am, without ever having met you - just like you rendered an opinion without any evidence,other than a bad experience with a car that YOU drove.
@@Adrian_Nel Evidence, you mean like the class action action lawsuit against Nissan due to their CVT's going out? Jatco also makes the CVT's that some models in Fiat owned brands like Chrysler/Dodge use and are notorious for premature failures.
All CVTs are jatco
True, Jatco make the absolute worse transmissions on the planet.
@@Adrian_Nel those CVTs all have full-time metal on metal slide friction, which you normally don't have when you use regular AT or MT, which is why AT or MT being used on highway may last for a million kms and CVT not
With amazing ZF 8 speeds and DCT transmissions, Nissan refuses to give up on CVT’s. You gotta admire their spunk.
Bucket says "stop trying to use me in you videos ... and feed me" ... hE is cute though
Jason? or the cat?🤣😁😜
when he said "hello everyone..." i looked at the board and thought to myself "this is genius!". So, congrats to Nissan. This CVT not only can handle more loads but it'll be far more durable
Ok, Jason, let's be real. How much are OEMs paying you to dissect and explain competitor technology??? 😂
Hahaha, they all know far more than I do. 😂 They've taken one of these apart before I even knew it existed. :)
20 years ago!mind blown!
whiteboard is too large, can't see.
Edit: just kidding. Shouldn't the power rollers be on opposite settings at all time, because the forces go in a circle?
Hahaha.
Yes, the power rollers are moved in opposite directions (always) by the moving trunnion.
I know this is 2 years old but Nissan CVTs are still failing by the bucket load and they have been since they were introduced in the 90s Primera.
I regularly see them at below 100k km (60k miles) and sometimes even half that.
I hope this system is a lot more reliable.
Better than Toyota's 3-in-1 (Clutch + Torque converter +) CVT box
You just might be right.
You must mean automotive high torque CVT. I work in the industrial sector and work on 125KW Generators on 7L GM V8 prime movers. They've got very tough CVT between the engine and the generator. Makes for longer than normal generators, but the speed regulation on high demand applications is awesome.
Yep, automotive! Thanks for sharing about your experience with them!
7 liter Diesel I presume. It amuses me to think of a 427 C I Chevy Big Block running a generator!
@@BobPegram Various sizes. Depends on the application. All are GM industrial, but there's some CAT units as well.
Nissan promising to build a good CVT is like an alcoholic promising to stop drinking. I mean It's not impossible but rather just unlikely occurrence. Maybe Nissan gets it right this time, only time/mileage will tell.
Love watching ur videos and how you break it all down. All I know is it sounds like a 7 or 8 thousand dollar transmission
sooo can it go full speed in reverse?
reverse goes throu a different gearing...
there would be an interlock of some kind unlike the DAF / Volvo versions of the CVT 45 years ago where you could go as fast as you wanted in reverse!
I love Trunnions. I buy a bag every time I go to the grocery store.
CVT= Cat's Vicious Talons.
The mere mention of CVT, that cat wanted out of there!
I wanna see a manual CVT. There's no reason you couldn't hook up the power roller angle to a lever and stick it into the cabin, allowing you to smoothly "adjust" gear ratio to your liking. Kinda like the prop pitch lever on a propeller plane.
And then hook it up to a foot clutch instead of a torque converter. I'd be happy as ever.
CVT would simply be less reliable than a stick shift and have no real advantage.
The only reason a CVT could be better than a stick shift is because it can constantly stay at perfect RPM. As soon as you control that manually it's not going to be at the perfect RPM anyway and you could just as well not have a CVT. Also clutch would only be for starting, shifting does not require use of a clutch.
@@FranseFrikandel The foot clutch for starting was my intention
Also I presume the controllable CVT lever would just be a fun thing; not necessarily for efficiency or power, similar to how modern manuals really don't hold a candle to good automatics, other than fun factor.
Operating it would be almost identical to operating the prop pitch lever on a plane; it certainly isn't impossible (or hard at all) to maintain excellent efficiency or power
If it's that old and not the standard by now, there must be some major downsides to it.
it was $3000 more per unit in 1999 vs traditional automatic and that was before fluid cost... pretty insane
I like that you've introduced a level of memes and jokes into your content. Been watching for years, keep doing you! Love from NC!
Their current CVT"s suck and unless this new ones can go over thousands of miles without breaking down even with proper fluid change then their CVT's won't change anyone's mind yet.
It’s that alluring gas mileage they are rated that keeps sales coming
Going b the same junk before u hit 50K miles u prolly gonna go through 2-3 transmisión replacements all Nissan cars are trash garbage
"this new ones" are out there since late 90s so not exactly new.
Extremely cool transmission concept