Not only does it feel better to drive, this DCVT has quite a few advantages, including better acceleration. All the details on its advantages here: ruclips.net/video/HanImTejIVM/видео.html
Engineering Explained I would love this as an art object in my house (I have an exhaust valve from an R-3350 and an X-Ray tube on my workbench). My wife not so much...Does “bucket” have a list?...sorry...
From an engineering POV, this is cutting-edge, amazing and combines the advantages and benefits of both kinds of transmissions (efficiency of CVT and excitement of a traditional transmission depending on choice!) From a mechanical POV, it’s not fun to work on and maintain lol, way more complex and has more moving parts than any other transmission Love your videos Jason, always nice to watch them, keep it up! ❤️✨
Reminds me of Obama's second last WHCD speech, where he announced his list of to-do's that rhymed with "bucket"... Show off my cat for likes? "Bucket"!
Ha, excellent! As long as your wheel speed doesn't exceed about 35 mph, you'd be using a set gear ratio. But to be fair other CVTs could also do burnouts, they're just generally used in non-burnout style cars. :)
Hahaha, I appreciate this so much. So many comments about it being complicated, but ya know what, modern cars are wildly complicated and people keep buying them. At least you stuck to your guns and actually went old school!
Hey there EE, you are truly blessing to the internet. I’ve been with you for years and I’m always excited for another awesome video! Everything you bring to the world is simply outstanding. I appreciate how intelligent you are, you are easy to follow and understand, and you are gifted at teaching all of us about all the new tech in an ever evolving industry. I got all my friends in the shop hooked on your channel and I recommend to all my car loving friends. Good work my friend, it’s been an honor to be with you for so long. Until next time, cheers from Iowa, USA!🇺🇸👍
Cody I think this is one of the kindest comments I ever received. I really appreciate it, and thanks for sharing with your shop buddies! Hope you have a wonderful week man! :)
What an elegant, not too complicated design that finally allows torque multiplication for brisk acceleration off the line and still have infinitely variable ratios and wide selection with a CVT. It eliminates the laggy response off the line of a CVT and retains the efficiency of the CVT when cruising. Imagine this transmission in a Crosstreck! It would help a lot off road where the traditional CVT lacks low end torque when driving slow. This transmission eliminates a lot of initial heat produced when you take off. Hope its reliable. Should be.
Well, it looks complex compared with that firm's "hybrid synergy drive (HSD)", at least from a mechanical perspective (I know the power electronics is something else for HSD). In the hybrid, the traction motor does the job, but presumably the DCVT is only used for engine-only vehicles?
I really enjoy your videos EE. Always fascinating stuff! It's the sort of content that we used to be able to get on cable from things like the Discovery channel, before they dumbed network tv down to the lowest common denominator.
This is an ingenious transmission. You have a gear for take off so there's no slipping under load, then the CVT so it's smooth and quick afterwords. I still want to see a CVT on a high revving rotary engine. Top speed monster!
im flabbergasted! that thing is as beautiful as the Honda engine you explained a few weeks ago. it seriously looks like a piece of artwork and im sure the crappy CVT belt could last much longer in this system since it takes the "weight" off the belt for initiating movement
This is brilliantly cutting edge. Put the first gear from manual driven by a torque converter from automatic while the two clutch packs from dual clutch engage with a CVT for higher gears. Excellent work Toyota!
I just rented a Corolla 2019 for 3 weeks, I finally understand why it felt so strange to drive. I could tell there was some CVT things going on ! The really horrible engine sound (noise?) ruins it all however. The passengers in the car even asked it the car had a problem from the noise & feeling of driving. Thanks Jason, so timely.
The corolla sedan uses a traditional CVT, the corolla hatchback uses the DCVT. They use very different engines too. No comparison really. I don't like how the sedan drives, bit the hatchback drives great (hence why I bought one).
@ Truck drivers unironically drive crashbox manuals to this day. It only takes a little bit of skill to use and you build it up real quick when you drive over 40 hours a week.
@@michaelbuckers Petterbuilt says 90% of trucks leaving the factory have automated transmissions. Freightliner says 85%. Europe passed 75% over 10 years ago. Manual transmissions are a niche product now. Now 5 or so years ago it was much lower (well Europe wasn't of course) like 10% or so but then the automated transmissions got better and things changed. Saving fuel matters to companies.
So adding first gear will lessen the initial torque the cvt has to cope with from a standing start. Looks like Toyota has figured out a possible way to make a cvt trans that'll live. I like it
Thank you very much! Liked, subscribed and shared. My absolute favorite RUclips channel by far. Loved the guest star, Bucket. Why hasn’t anyone else covered the DCVT on RUclips?
CVT belts use a V profile. So, if you increase the torque you increase the linear force on the belt, which wedges the belt harder into the pulley. This increases friction between the pulley and the belt. Increased friction means you can transmit higher forces through the mating surfaces. Translates to more torque. Basically, V belts are more or less self-tensioning as the load increases (up to a limit).
The belt pushes instead of pulling. That's why it's made of metal shims. Since the metal isn't compressible, the belt binds on the pulley preventing slippage.
@suspicionofdeceit Good fluid and constantly cooled. That's the biggest reason Nissan cvts break. Belt shears and slips becauae fluid is high tolerance, cooler on them sucks. People have mitigated it by installing a better universal cooler and newer fluid. That said, Renault Nissan did that on purpose. They pulled a Dexcool gasket scam.
Transmission fluid. The oil lubricates the shims as they go into position on the sheave, then the force against the sheave displaces the oil and allows for friction against the sheave. If a CVT is well lubricated it won't experience wear to a significant degree and should survive the life of the engine
This is the great thing about this design - the novelty is combining the best traits of existing designs into one package. It is essentially a manual design (shift forks) matched with an automatic (torque converter & a "2 speed" gearbox) matched with a CVT (the belt driven unit acting as "2nd gear") with two wet plate clutches. There is no new fancy technology at play here - and this is Toyota we're talking about whose Aisin transaxles have proven to be quite durable.
For sometime now Honda has been a leader in the automotive industry with the introduction of the vtec, now Toyota has come up with a new cvt auto trans combined with gears & clutches.. The Japanese has always been good with engineering I'm really impressed.
CVT was invented in Eindhoven Netherlands, by the now defunkt Dutch car manufacturer DAF (who still are an important Large Truck manufacturer). In the DAF cars it worked with two pullies with a PULLING belt between them. The modern version is an further development of that by VDT (Van Doorne's Transmissions, a spin-off of DAF), which was later picked up by Japanese manufacturers, Mitsubishi I believe. This later CVT transmission has a belt with metal strips that PUSHES the pullies..
I think he means the direction the pulleys are rotating the rigid belt. Both systems use two sheaves or pulleys. One primary side connected to the engine and the secondary side connected to the diff and then the wheels of the vehicle. I suspect CVT designs will be dead in less than 10 years. It’s just bad tech.
@@danhg3885 I don't think CVT is a bad idea. Now once we go electric we don't need transmissions anymore, so yes they probably will disappear along with every other transmission type as a result. Besides there are many designs for CVT, including the amazing ones used in heavy machines, although I think they are all toroidal CVTs (or IVTs) so they can handle the torque. Those things are amazing.
I don't think I would call DAF defunct. They were bought by volvo and kept making cars for quite a while in the Netherlands. They eventually sold the plant to mitsubishi though.
Lennart Sorensen I think I should say certain automakers designs suffer from poor reliability and satisfaction. The newer designs from Toyota, Honda, and Hyundai Kia appears to be addressing a lot of these concerns. Toyota’s low starting gear design is a clever modification to improve drive ability. Nissan’s powertrain partner JATCO seems to be giving the whole CVT market a black eye as these appear to fail frequently and are used in cheap highly depreciated models. Thanks for your input. I made the mistake generalizing the CVT design from one firm. I mostly only see the broken stuff.
Ha! Easy. Cats require so very little responsibility, which is why I love them. Dogs require constant attention. Not that I would leave my cat alone for this long, but he could go about a week without me touching his food, water, or litter box (it's a robot litter box, and it's awesome haha). I hate responsibility haha, that's why I like cats. Dogs are wonderful, amazing creatures. Just a lot more work.
As I can see, transmisions are still evolving. These new complexities make the case for electric cars where all those expensive mechanical parts are being replaced basically by a simple controller and software.
It’s probably going to cost around 5k-7k to fix. So expect to just junk the car at that point unless it’s a Lexus. If they are reliable and sell enough units, the good news is the salvage yards will be full of used transaxles bringing the price down. First year will be the guinea pigs. Maybe wait out the 1st gen. Just maybe Toyota will sell the aftermarket replacement internal parts for these guys to bring down the ownership pain... maybe. Hondas’ reman CVTs are close to 5-7k just for the complete unit itself. No labor. It’s crazy town.
@@danhg3885 It is a Lexus, even if they are also going to shove it in a Toyota. I drive a GS450h with their next most complex transmission (dual-stage planetary)- I don't think one has ever broken even with enough power to reform Pangaea going through it. That said, an even more complex one doesn't seem necessary, a good torque convertor with paddles is still as good as it gets for me.
Apothecary Terry I meant the Lexus will have the resale value to warrant a repair where a Corolla would just be junked if the transaxle failed. They would be the same mechanical units. One is in a 20k econobox and one it a 40k lux. This will influence repair decisions. How old is your gs450h? Less than 60k miles I wouldn’t call it bulletproof yet. It’s a much different unit than what the subject video is discussing.
@@danhg3885 Fair point about resale, I just don't think the reliability will be of a level where many people face that decision. Obviously we don't know yet, that's just based on their recent record. My GS is 2013 with about 70k on it, but I was more referring to the fact I can't find any reports of failures in the gen 4 transmission at all. Found one website suggesting the most likely weak points but no actual example of one going wrong- my local dealer said they've never seen a 4th gen GS450h back for a part failure (after I bought it so this wasn't sales pitch either). Obviously the rarity is a huge factor, but then looking at a Panamera, it's a very comparable car in most ways (except used price, because "ooh a Porsche badge"), with a similar number sold, however it's much easier to find stories of faults and they're not exactly unreliable. I was tempted to pick on a Maserati...but that's just seal clubbing.
This is a really cool idea. I have an older Nissan Sentra with CVT and my main complaint is the slow acceleration from a stop that a fixed first gear would really help. It's too bad you couldn't retrofit this into an existing CVT!
I've driven about 1.6 million miles, about 500,000 on automatics, and about 1,100,000 on stick shifts. Not only do I prefer a manual, I don't really like the 6-speed variants. A 5-speed stick with well calibrated gear ratios and a quality clutch is the pinnacle of transmissions. granted, many clutches aren't that great, and many stick shifts don't have all of their gear ratios calibrated well due to companies using "off the shelf" gears in them.
I only care about two things. How reliable will it be and how much of a pain in the ass will it be to fix it when something breaks. If it isn't more reliable than the last thing they put out, or will be a nightmare for me or (god forbid) a mechanic that I have to pay, then it might as well be the worlds most technologically advanced polished turd.
The whole thing is small enough to hold with two hands and has fewer moving parts than both an automatic and manual transmission, without the high-torque wear associated with CVTs. I think it will be extremely long lasting and easy to repair.
@megakiller999 That's probably the most incorrect comment I've read in a long long time. For some reality note this device has a chain. For more on chains see quora dot com/Which-is-better-to-use-on-a-car-a-timing-belt-or-a-timing-chain/answer/Jason-Taylor-16 .
Also when the belt snaps (Like they do in the Nissan's) will it self destruct the transmission... it does seem to be the same type of push belt with the metal parts going over a belt and not a Chain type CVT.
They're wet multi-plate clutches, they'll last an incredible amount of time. Same tech is used all over different style drivetrains, and all kinds of AWD systems.
@@EngineeringExplained In Subaru's automatic AWD, they use this kind of clutch pack, and with milleage and wear, the awd tends to not engage smoothly and when you want it to. So maybe they put a better clutch system, but I fear that the wear would make the 1st to cvt transition not smooth in this transmission. Only time will tell
Even standard automatic transmissions use wet clutch plates. That's typically what goes toast in a automatic transmission from not changing the fluid, or running it too hot and wearing the plates out.
i don't think that i've ever rebuilt an automatic where clutch wear was the cause of failure, always some other failure that may have also destroyed the clutch pack.
Hey Jason, I love your videos. Your videos have made me develop a better automotive engineer out of myself. I wanted to ask how does the reverse gear work on DCVT transmission?
Wow. Absolutely crazy. I remember talking to my peers about how a company could probably make a combination of all transmissions if they really wanted something perfect, but its too expensive. In the industrial sector however, there is a type of transmission that combines a hydrostatic and automatic transmission. (Hydrostatic is what bulldozers use, its extremely good for low speed, and maximum torque). Ive seen it on loaders alot.
Toyota lately have been doing very clever stuff in engine department, using conventional technology to come up with traditional idea transforming it to efficient newer ideas with proven technologies. Just clever.
Engineering Explained Automatic transmissions are way simpler than that monstrosity. I know you’re on the Toyota payroll but you could at least agree that this thing is overcomplicated and prone to failure.
@@dexnpy i mean that kind of obvious when you combine the advantages of a CVT with the ones from a regular transmission but it still has far less than a regular automatic transmission.
@@Pixelplanet5 from both videos Jason made about this transmission I understand that it functions as a CVT most of the time while the vehicle is moving, which is why I feel it is more fair to compare it to a CVT instead of a regular AT.
Prettyych every transmission nowadays is going to be much harder to work on. But if it's can be made then there is a way to work and fix it, just got to adapt to new tech.
It's a Toyota, it's not going to break. It does seem massively over-complicated, although my GS450h has some ridiculous dual-stage planetary setup (with 2 electric motors and a V6 all going through it) and I literally can't find any record of one ever having an issue. If it does break, so will the bank unless it's in the next year under the warranty, but I'd put a lot of money on these being more reliable than any DCT. In fact I did- the cost of a fully loaded GS450h.
Normally there is either a single fixed gear for reverse or a dedicated forwards/neutral/reverse box. The latter was famously applied in the Van Doornes Transmissie (DAF), giving the car the same top speed both forwards and in reverse. Which let to great hilarity in Dutch 70's and 80's autocross
@@JohnyMcNeal But you can only test a very limited amount of time and scenarios compared to what exists in reality, so they will probably find quite a lot of stuff that still needs some attention
@@EngineeringExplained But still, the first generation of anything always has at least some issues. More so with cars. Of course, sometimes you get the opposite effect - engineers don't yet know how to model failure modes, so they make something too beefy / good, resulting in "too reliable" machines. E.g. 1.9 TDI... But more often than not they accidentally have a weak link somewhere in there. Remember oil-powered variable valve timing? Well...
Jason, the whole purpose of a cvt is to keep the engine at a pre determined rpm for best efficiency. Therefore, it's not correct to say the engine speeds up, or slows down, but that when the pulley's change their working diameter, this causes the car to go from slow to fast at fairly constant speed. It's the change in diameter, not the engine speed which causes the speed changes. It's all about leverage, just like with a bicycle chain sprocket on the crank and the driven wheel.
So only benefit of this is the fun part of traditional gears vs a traditional cvt or this actually increases performance and/or efficiency(fuel average)?
Nissan uses JATCO transmissions, JATCO is a Nissan division. All automatic ones from JATCO are terrible even the dual clutch and the robotic. Toyota is using AISIN transmissions, Toyota holds 30% or 35% of AISIN but doesn't own the company as Lexus. Also a few new trucks (like RAM) in the US will be starting to use AISIN transmissions instead.
CVT's have so many advantages. In a tractor for example it is the most versatile and easy to use transmission. Coupled with a hydraulic forward/neutral/reverse powershift it makes working very easy. It regulates optimal engine RPM under varying load and throttle input. Tractor gets more economical, has an almost perfectly smooth output powerband, and with a flick of a switch goes from full speed forwards to full speed backwards in a pretty quick, smooth and predictable fashion without the need to apply the brakes.
I see you're the type of person who holds onto first impressions with an iron grip. CVTs aren't terrible, nor are Nissan's specifically. CVTs around 2012 were terrible but all of the companies using them learned from each other's mistakes and are continuing to improve.
This makes sense. If you have driven a CVT from say Nissan, you know the initial take off is a bit sluggish. I would imagine the direct 1st gear helps with this big time.
Man! this is a brilliant solution! That launch gear is gold! What i am hoping is evolution of this hybrid transmission and want to see it become sports car transmission with 2 launch gears and faster CVT with actual smooth infinite ratios, not silly "fixed" ratios. 0-100 in 4/5 seconds and also 10-15L/100km
Jason! You should start making videos about how these new inventions in the automotive industry fit in place for the common consumer. I'd love to hear what you think of these many different new engines, transmissions, etc.
This actually gives a nice feeling to the car. I wish they used a launch gear in the Rav4 and Rav4 prime too (they don't have that nice direct feeling as in the new Corolla)
My solution for fuel economy is a Suzuki Alto 800 : simple, cheap and easy to maintain, with a fuel economy from 38-64 mpg (6.217 - 3.67 l/100km ). For daily use it feels great after the 24l/100km with my Ford Super Duty.
I love how the Cvt delivers power but I had a bad experience with a 2014 Nissan Murano and now my sister is getting about the same issues with her 16 Altima.
That is actually not terribly complex mechanically, very similar to the JATCO CVT in Nissans and Chrysler vehicles. The benefit here is that first gear allowing big torque loads, really cool!
This is such a brilliant system. The day strictly CVT came out, I was wondering why not combine them. Great video explaining it perfectly. I hope this transmission catches on. One thing you didn't mention was weight? I'm just going to assume it's heavier.
Not only does it feel better to drive, this DCVT has quite a few advantages, including better acceleration. All the details on its advantages here: ruclips.net/video/HanImTejIVM/видео.html
Super righteous Jason!
The all three in one is a bit beyond my capacity to understand.....lol
I wonder what type of transmission fluid it takes?
CVT is very useful in low speed (60km/h and below). However, Dual Clutch simply does better when comes to high speed and demand in performance
@@C3ByAx
It's going to be interesting to see the fuel mileage ratings in the next 10 years......lol
Engineering Explained I'm guessing it's expensive to fix when it goes wrong
Engineering Explained I would love this as an art object in my house (I have an exhaust valve from an R-3350 and an X-Ray tube on my workbench). My wife not so much...Does “bucket” have a list?...sorry...
If there were an Engineering Explained online degree I would have it by now. I Love your videos
Happy to hear it, thanks for watching! I'll put your diploma in the mail.
@@EngineeringExplained That would be great! Thanks! 😂
From an engineering POV, this is cutting-edge, amazing and combines the advantages and benefits of both kinds of transmissions (efficiency of CVT and excitement of a traditional transmission depending on choice!)
From a mechanical POV, it’s not fun to work on and maintain lol, way more complex and has more moving parts than any other transmission
Love your videos Jason, always nice to watch them, keep it up! ❤️✨
Excitement? There is only 1 fixed gear. I both get why they developed it and on the other hand I really don't.
This looks far less complicated than a conventional automatic.
Duskconqueror agreed
lol, conventional auto is so much simpler
adding more gears does not make transmission more complex, it's just another set of planetary gears and clutchpack
Using a cat to trick the internet into liking the video. Well played
He's the best! instagram.com/bucketron/
I clicked the like button because of the cat! :)
Is that a Ulysses kid southpark pfp?
That's it. I'm following Bucket on Instagram.
Reminds me of Obama's second last WHCD speech, where he announced his list of to-do's that rhymed with "bucket"...
Show off my cat for likes? "Bucket"!
So basically, it's a CVT that can do burnouts? 😛
Ha, excellent! As long as your wheel speed doesn't exceed about 35 mph, you'd be using a set gear ratio. But to be fair other CVTs could also do burnouts, they're just generally used in non-burnout style cars. :)
@@EngineeringExplained Are you saying that a Honda CRV isn't a burnout style car?
it's easier - honda crv not a car lol, it's shitbox
@@EngineeringExplained i want a manual cvt with a slider handle. how should I implement this?
I still want to see a manual DCT. The control architecture would be really interesting methinks.
I hate all this modern technology. A few months ago I sold my car and now I ride a donkey.
Hahaha, I appreciate this so much. So many comments about it being complicated, but ya know what, modern cars are wildly complicated and people keep buying them. At least you stuck to your guns and actually went old school!
That will save you on transmission repair ; Is that a direct drive donkey?
It is also called a Gore mobile.
Jesus had that idea before you.
Even donkeys have changed nowadays. There is even one braying orange donkey who became a president.
The real thing that I hate about CVT is that slow start but now I'm interested in try this new DCVT
you should try a Tesla :-)
Tell the truth...,sometimes you use your cat to clean your white board, don't you!?
😂😂 I would have so many scars haha
The cat now knows everything about DCVT
Hey there EE, you are truly blessing to the internet. I’ve been with you for years and I’m always excited for another awesome video! Everything you bring to the world is simply outstanding. I appreciate how intelligent you are, you are easy to follow and understand, and you are gifted at teaching all of us about all the new tech in an ever evolving industry. I got all my friends in the shop hooked on your channel and I recommend to all my car loving friends. Good work my friend, it’s been an honor to be with you for so long. Until next time, cheers from Iowa, USA!🇺🇸👍
Cody I think this is one of the kindest comments I ever received. I really appreciate it, and thanks for sharing with your shop buddies! Hope you have a wonderful week man! :)
Really? I kind find him way too difficult to follow. He's so amateur.
This explains the new advertising Toyota has put out showing the 2019 Corolla being a little racer. You’ve done a great job here!!
What an elegant, not too complicated design that finally allows torque multiplication for brisk acceleration off the line and still have infinitely variable ratios and wide selection with a CVT. It eliminates the laggy response off the line of a CVT and retains the efficiency of the CVT when cruising. Imagine this transmission in a Crosstreck! It would help a lot off road where the traditional CVT lacks low end torque when driving slow. This transmission eliminates a lot of initial heat produced when you take off. Hope its reliable. Should be.
Well, it looks complex compared with that firm's "hybrid synergy drive (HSD)", at least from a mechanical perspective (I know the power electronics is something else for HSD). In the hybrid, the traction motor does the job, but presumably the DCVT is only used for engine-only vehicles?
My opinion too. This may be tranny of the future. Toyota not noted for building junk.
An electric powertrain is still so much simpler and more powerful. And very reliable too.
Not sure about eliminating lag and being torquey, we're still talking about a Toyota Corolla here. :)
@Daver G
That's strange, because most Tesla owners regularly go on long trips, and use their car all year, from California to Norway.
The most stress on the CVT belt is starting from a stop. Toyota has managed to greatly extend the lifespan of the CVT belt by this design!
I really enjoy your videos EE. Always fascinating stuff!
It's the sort of content that we used to be able to get on cable from things like the Discovery channel, before they dumbed network tv down to the lowest common denominator.
Ha, thanks, glad you enjoy the content! I do agree though, it’s all reality dramas now and very few educational programs, which is a bummer.
This is precisely what i wanted!
“What transmission do you want?
“Yes”
This is an ingenious transmission. You have a gear for take off so there's no slipping under load, then the CVT so it's smooth and quick afterwords. I still want to see a CVT on a high revving rotary engine. Top speed monster!
Bucket understood all the complexity of this transmition with just a glance !
im flabbergasted! that thing is as beautiful as the Honda engine you explained a few weeks ago. it seriously looks like a piece of artwork and im sure the crappy CVT belt could last much longer in this system since it takes the "weight" off the belt for initiating movement
This is brilliantly cutting edge. Put the first gear from manual driven by a torque converter from automatic while the two clutch packs from dual clutch engage with a CVT for higher gears. Excellent work Toyota!
*The Toyota Prius is a beast of a car*
I am amazed at how small the foot print is of the transmission
Congratulations on your 2,000,000 subscribers
Thank you!! :) :) Appreciate all of the support!
There's only 7000 million people on this planet
I just rented a Corolla 2019 for 3 weeks, I finally understand why it felt so strange to drive. I could tell there was some CVT things going on ! The really horrible engine sound (noise?) ruins it all however. The passengers in the car even asked it the car had a problem from the noise & feeling of driving.
Thanks Jason, so timely.
The corolla sedan uses a traditional CVT, the corolla hatchback uses the DCVT. They use very different engines too. No comparison really. I don't like how the sedan drives, bit the hatchback drives great (hence why I bought one).
My left ear enjoyed this
I'll stick to my manual transmission...
Over complicated. The old manual box is far better.
@ Truck drivers unironically drive crashbox manuals to this day. It only takes a little bit of skill to use and you build it up real quick when you drive over 40 hours a week.
@@michaelbuckers Petterbuilt says 90% of trucks leaving the factory have automated transmissions. Freightliner says 85%. Europe passed 75% over 10 years ago. Manual transmissions are a niche product now. Now 5 or so years ago it was much lower (well Europe wasn't of course) like 10% or so but then the automated transmissions got better and things changed. Saving fuel matters to companies.
I drove one of these in the new 2019 Corolla Hatch, and I was impressed. Feels a lot more like a proper automatic than a CVT.
i bought a 2023 corolla (2.0L) and the gearbox clunk (it clunks the moment i press or release the gas pedal) the dealer says its "normal" !!
Jason, very clear, concise explanation. Now I have to go watch the other video to figure out why we need so much complication.😖
Haha, the benefits are actually quite cool!
Superb video!
So adding first gear will lessen the initial torque the cvt has to cope with from a standing start. Looks like Toyota has figured out a possible way to make a cvt trans that'll live. I like it
Thank you very much! Liked, subscribed and shared. My absolute favorite RUclips channel by far.
Loved the guest star, Bucket. Why hasn’t anyone else covered the DCVT on RUclips?
Can you please make a video explaining why CVT belt doesn't slip at even low rpm. The pulley looks so slippery.
CVT belts use a V profile. So, if you increase the torque you increase the linear force on the belt, which wedges the belt harder into the pulley. This increases friction between the pulley and the belt. Increased friction means you can transmit higher forces through the mating surfaces. Translates to more torque. Basically, V belts are more or less self-tensioning as the load increases (up to a limit).
The belt pushes instead of pulling. That's why it's made of metal shims. Since the metal isn't compressible, the belt binds on the pulley preventing slippage.
@suspicionofdeceit Good fluid and constantly cooled.
That's the biggest reason Nissan cvts break.
Belt shears and slips becauae fluid is high tolerance, cooler on them sucks. People have mitigated it by installing a better universal cooler and newer fluid.
That said, Renault Nissan did that on purpose. They pulled a Dexcool gasket scam.
I suspect they don't slip mainly because they never put real power in front of them...because it would slip.
Transmission fluid. The oil lubricates the shims as they go into position on the sheave, then the force against the sheave displaces the oil and allows for friction against the sheave. If a CVT is well lubricated it won't experience wear to a significant degree and should survive the life of the engine
the amount of work that goes into this tech is amazing.
all this to help disabled people still be able to commute with a car.. that's true dedication.
God help your bank account when it breaks. 🤪💵💵💵💵
How fortunate that this one is made by Aisin. They seem to have a knack to build these to last.
I don't see how it could break, it uses simple and traditional mechanisms
It's a Toyota transmission, not a Chrysler lol
This is the great thing about this design - the novelty is combining the best traits of existing designs into one package. It is essentially a manual design (shift forks) matched with an automatic (torque converter & a "2 speed" gearbox) matched with a CVT (the belt driven unit acting as "2nd gear") with two wet plate clutches. There is no new fancy technology at play here - and this is Toyota we're talking about whose Aisin transaxles have proven to be quite durable.
A lot of very large car makers do not use in-house built transmissions.
For sometime now Honda has been a leader in the automotive industry with the introduction of the vtec, now Toyota has come up with a new cvt auto trans combined with gears & clutches.. The Japanese has always been good with engineering I'm really impressed.
more bucket content. bucket needs to be heard
Would you like to explain about the engineering of the F1 ?
CVT was invented in Eindhoven Netherlands, by the now defunkt Dutch car manufacturer DAF (who still are an important Large Truck manufacturer). In the DAF cars it worked with two pullies with a PULLING belt between them. The modern version is an further development of that by VDT (Van Doorne's Transmissions, a spin-off of DAF), which was later picked up by Japanese manufacturers, Mitsubishi I believe. This later CVT transmission has a belt with metal strips that PUSHES the pullies..
I think he means the direction the pulleys are rotating the rigid belt. Both systems use two sheaves or pulleys. One primary side connected to the engine and the secondary side connected to the diff and then the wheels of the vehicle.
I suspect CVT designs will be dead in less than 10 years. It’s just bad tech.
@@danhg3885 I don't think CVT is a bad idea. Now once we go electric we don't need transmissions anymore, so yes they probably will disappear along with every other transmission type as a result. Besides there are many designs for CVT, including the amazing ones used in heavy machines, although I think they are all toroidal CVTs (or IVTs) so they can handle the torque. Those things are amazing.
I don't think I would call DAF defunct. They were bought by volvo and kept making cars for quite a while in the Netherlands. They eventually sold the plant to mitsubishi though.
Lennart Sorensen I think I should say certain automakers designs suffer from poor reliability and satisfaction. The newer designs from Toyota, Honda, and Hyundai Kia appears to be addressing a lot of these concerns. Toyota’s low starting gear design is a clever modification to improve drive ability.
Nissan’s powertrain partner JATCO seems to be giving the whole CVT market a black eye as these appear to fail frequently and are used in cheap highly depreciated models. Thanks for your input. I made the mistake generalizing the CVT design from one firm. I mostly only see the broken stuff.
Best car channel on RUclips
Very kind, thanks! 🙏
Bucket is awesome.
He is indeed!
Supervisor Bucket, checking the whiteboard for TQM!
Informative and has Bucket. Thumbs up for the cat!
love the content
Can you do a video on the benefits of cat ownership vs dog ownership?
Ha! Easy. Cats require so very little responsibility, which is why I love them. Dogs require constant attention. Not that I would leave my cat alone for this long, but he could go about a week without me touching his food, water, or litter box (it's a robot litter box, and it's awesome haha). I hate responsibility haha, that's why I like cats. Dogs are wonderful, amazing creatures. Just a lot more work.
Yeah, need to whiteboard that topic
This is classic high quality EE. Great visuals, great explanation, and most importantly, great technology! (Also great cat)
Cats do not "interrupt" - they share their presence with their human minions at their own convenience.
Haha, yess!!
It's the perfect CVT transmission. Thank you Toyota.
Great video, thanks.
Yeah yeah DCVT whatever, I'm here for the cat cameos.
Excellent!
I'm so glad you do these videos and educate us on this new technology.
Thanks Michael, and thanks for watching! :)
What about the lubrication,does it use wet clutches
Yes
Same clutches like a conventional automatic.
@@danhg3885 my bad he did say 'clutch pack'
As I can see, transmisions are still evolving. These new complexities make the case for electric cars where all those expensive mechanical parts are being replaced basically by a simple controller and software.
So when the CVT fails, you can still limp home in first gear!
The looks of that makes electric vehicles look simple... But then again huraah for innovation!!!
Such complicated transmission must have life time guarantee or God help Corolla customers when it breaks.
It's a Toyota, it won't. It does seem a bit OTT though...
It’s probably going to cost around 5k-7k to fix. So expect to just junk the car at that point unless it’s a Lexus. If they are reliable and sell enough units, the good news is the salvage yards will be full of used transaxles bringing the price down.
First year will be the guinea pigs. Maybe wait out the 1st gen.
Just maybe Toyota will sell the aftermarket replacement internal parts for these guys to bring down the ownership pain... maybe.
Hondas’ reman CVTs are close to 5-7k just for the complete unit itself. No labor. It’s crazy town.
@@danhg3885 It is a Lexus, even if they are also going to shove it in a Toyota. I drive a GS450h with their next most complex transmission (dual-stage planetary)- I don't think one has ever broken even with enough power to reform Pangaea going through it. That said, an even more complex one doesn't seem necessary, a good torque convertor with paddles is still as good as it gets for me.
Apothecary Terry I meant the Lexus will have the resale value to warrant a repair where a Corolla would just be junked if the transaxle failed. They would be the same mechanical units. One is in a 20k econobox and one it a 40k lux. This will influence repair decisions.
How old is your gs450h? Less than 60k miles I wouldn’t call it bulletproof yet. It’s a much different unit than what the subject video is discussing.
@@danhg3885 Fair point about resale, I just don't think the reliability will be of a level where many people face that decision. Obviously we don't know yet, that's just based on their recent record.
My GS is 2013 with about 70k on it, but I was more referring to the fact I can't find any reports of failures in the gen 4 transmission at all. Found one website suggesting the most likely weak points but no actual example of one going wrong- my local dealer said they've never seen a 4th gen GS450h back for a part failure (after I bought it so this wasn't sales pitch either). Obviously the rarity is a huge factor, but then looking at a Panamera, it's a very comparable car in most ways (except used price, because "ooh a Porsche badge"), with a similar number sold, however it's much easier to find stories of faults and they're not exactly unreliable. I was tempted to pick on a Maserati...but that's just seal clubbing.
This is a really cool idea. I have an older Nissan Sentra with CVT and my main complaint is the slow acceleration from a stop that a fixed first gear would really help. It's too bad you couldn't retrofit this into an existing CVT!
+1 for your cat having a funny name
Ugh. Just give me an “old-fashioned” manual transmission with a clutch pedal and shifter stick over this convoluted thing any day.
I agree, I've owned four manuals, but if you're going to buy an auto it's a very clever, efficient solution. And it turns out most people buy auto.
A manual transmission is way more convoluted than this lol. Just say "I am a luddite"
Automatics has got one big advantage over manuals, they are easy to drive in towns, that’s it.
CafeArtuk They get better gas mileage and are lower maintenance
I've driven about 1.6 million miles, about 500,000 on automatics, and about 1,100,000 on stick shifts.
Not only do I prefer a manual, I don't really like the 6-speed variants.
A 5-speed stick with well calibrated gear ratios and a quality clutch is the pinnacle of transmissions.
granted, many clutches aren't that great, and many stick shifts don't have all of their gear ratios calibrated well due to companies using "off the shelf" gears in them.
My granddaughter who is 9 loved your video and so did I tks
I only care about two things. How reliable will it be and how much of a pain in the ass will it be to fix it when something breaks. If it isn't more reliable than the last thing they put out, or will be a nightmare for me or (god forbid) a mechanic that I have to pay, then it might as well be the worlds most technologically advanced polished turd.
Well put.
The whole thing is small enough to hold with two hands and has fewer moving parts than both an automatic and manual transmission, without the high-torque wear associated with CVTs. I think it will be extremely long lasting and easy to repair.
Parts wise, it'll be cheaper than a 6 or 8 speed Automatic. Less moving parts. Labor wise, it is still unknown, due the the complexity of assembly.
@megakiller999 That's probably the most incorrect comment I've read in a long long time. For some reality note this device has a chain. For more on chains see quora dot com/Which-is-better-to-use-on-a-car-a-timing-belt-or-a-timing-chain/answer/Jason-Taylor-16 .
Also when the belt snaps (Like they do in the Nissan's) will it self destruct the transmission... it does seem to be the same type of push belt with the metal parts going over a belt and not a Chain type CVT.
That belt-chain is amazing!
All's well and good until the clutch needs replacing.
They're wet multi-plate clutches, they'll last an incredible amount of time. Same tech is used all over different style drivetrains, and all kinds of AWD systems.
it will take at least over 250 000 miles to replace it because it is not primary clutch for starting up the car from standstill.
@@EngineeringExplained In Subaru's automatic AWD, they use this kind of clutch pack, and with milleage and wear, the awd tends to not engage smoothly and when you want it to. So maybe they put a better clutch system, but I fear that the wear would make the 1st to cvt transition not smooth in this transmission. Only time will tell
Even standard automatic transmissions use wet clutch plates. That's typically what goes toast in a automatic transmission from not changing the fluid, or running it too hot and wearing the plates out.
i don't think that i've ever rebuilt an automatic where clutch wear was the cause of failure, always some other failure that may have also destroyed the clutch pack.
its like
toyota engineer: What transmission do you prefer boss?
toyota ceo: yes.
Kitty!
So cute. More cat please.
I love your videos they help me study
These cats nowadays... are so huge.
Btw, great video anyway.
He's 15 lbs!
Ahh, 6,8kgs. Huge indeed.
Bucket is awesome ! he looks beautiful
Love at first sight. Normally I'd be here all "looks complicated, when does it break" but I don't care I love the moxy, lets do it.
I thought about something like this awhile ago.
Hey Jason, I love your videos. Your videos have made me develop a better automotive engineer out of myself.
I wanted to ask how does the reverse gear work on DCVT transmission?
Wow. Absolutely crazy. I remember talking to my peers about how a company could probably make a combination of all transmissions if they really wanted something perfect, but its too expensive.
In the industrial sector however, there is a type of transmission that combines a hydrostatic and automatic transmission. (Hydrostatic is what bulldozers use, its extremely good for low speed, and maximum torque). Ive seen it on loaders alot.
Wow! Amazing! Anyway, give me my DCT please ✌
Thanks so much for the video, and congratulations on the well deserved 2M subscribers!
Thanks!
Notification SQUAD 😙😙😙😙😙😙
Your white board is insanely clean
Toyota lately have been doing very clever stuff in engine department, using conventional technology to come up with traditional idea transforming it to efficient newer ideas with proven technologies. Just clever.
This is why the Prius lasts.
Congrats on ur 2 mills and for ur best explanation we ever listen to you.
Oh yay! An even more complex and expensive transmission! Can't wait to pay for those repair bills.
What modern automatic transmission is simple haha?
Engineering Explained Automatic transmissions are way simpler than that monstrosity. I know you’re on the Toyota payroll but you could at least agree that this thing is overcomplicated and prone to failure.
Glad to see Bucket is still going strong ☺
Just what we asked for
more computers and moving parts ?
And with many, many advantages: ruclips.net/video/HanImTejIVM/видео.html I don't see the additional computers.
where do you see more computers and moving parts compared to a regular automatic transmission?
@@Pixelplanet5 There are more moving parts than a regular CVT.
@@dexnpy i mean that kind of obvious when you combine the advantages of a CVT with the ones from a regular transmission but it still has far less than a regular automatic transmission.
@@Pixelplanet5 from both videos Jason made about this transmission I understand that it functions as a CVT most of the time while the vehicle is moving, which is why I feel it is more fair to compare it to a CVT instead of a regular AT.
The drawing on the board at the beginning were a little scary, but you always explain so well.
I can see that this is not made to be worked on... If anything at all breaks, you're gonna have a bad time.
Exactly what I was thinking!
Prettyych every transmission nowadays is going to be much harder to work on. But if it's can be made then there is a way to work and fix it, just got to adapt to new tech.
@@ManuJohn380 having a way of fixing it does not mean it's practical if the cost of fixing equals of exceeds the cost of a new one...
It's a Toyota, it's not going to break. It does seem massively over-complicated, although my GS450h has some ridiculous dual-stage planetary setup (with 2 electric motors and a V6 all going through it) and I literally can't find any record of one ever having an issue. If it does break, so will the bank unless it's in the next year under the warranty, but I'd put a lot of money on these being more reliable than any DCT. In fact I did- the cost of a fully loaded GS450h.
I wish all CVT’s were like this. I would have loved it in my 2014 Accord Coupe.
Where’s the reverse?
there is non! you only can drive forward! :O
My question as well.
You put it in neutral and get out of the car to push it
Normally there is either a single fixed gear for reverse or a dedicated forwards/neutral/reverse box. The latter was famously applied in the Van Doornes Transmissie (DAF), giving the car the same top speed both forwards and in reverse. Which let to great hilarity in Dutch 70's and 80's autocross
What are you? A French army?
Excellent video. How torque converter is locked?
Under NO circumstance would I buy the first generation of this thing. It will break often.
Yeah Toyota and Lexus don’t have a reputation of putting out reliable hardware. 😁
Engineering Explained dead
I think they tested it long enough before deciding to implement it dont you?!
@@JohnyMcNeal But you can only test a very limited amount of time and scenarios compared to what exists in reality, so they will probably find quite a lot of stuff that still needs some attention
@@EngineeringExplained But still, the first generation of anything always has at least some issues. More so with cars. Of course, sometimes you get the opposite effect - engineers don't yet know how to model failure modes, so they make something too beefy / good, resulting in "too reliable" machines. E.g. 1.9 TDI...
But more often than not they accidentally have a weak link somewhere in there. Remember oil-powered variable valve timing? Well...
Jason, the whole purpose of a cvt is to keep the engine at a pre determined rpm for best efficiency. Therefore, it's not correct to say the engine speeds up, or slows down, but that when the pulley's change their working diameter, this causes the car to go from slow to fast at fairly constant speed. It's the change in diameter, not the engine speed which causes the speed changes. It's all about leverage, just like with a bicycle chain sprocket on the crank and the driven wheel.
“5 engineers in a room with a white board “ so how can we make a transmission that’s going to Break and be 3x the price to fix and then this happens
So only benefit of this is the fun part of traditional gears vs a traditional cvt or this actually increases performance and/or efficiency(fuel average)?
CVT transmissions are terrible. Just ask Nissan
Nissan CVT transmissions are terrible, not in general anymore.
Nissan uses JATCO transmissions, JATCO is a Nissan division. All automatic ones from JATCO are terrible even the dual clutch and the robotic. Toyota is using AISIN transmissions, Toyota holds 30% or 35% of AISIN but doesn't own the company as Lexus. Also a few new trucks (like RAM) in the US will be starting to use AISIN transmissions instead.
CVT's have so many advantages. In a tractor for example it is the most versatile and easy to use transmission. Coupled with a hydraulic forward/neutral/reverse powershift it makes working very easy. It regulates optimal engine RPM under varying load and throttle input. Tractor gets more economical, has an almost perfectly smooth output powerband, and with a flick of a switch goes from full speed forwards to full speed backwards in a pretty quick, smooth and predictable fashion without the need to apply the brakes.
I see you're the type of person who holds onto first impressions with an iron grip.
CVTs aren't terrible, nor are Nissan's specifically. CVTs around 2012 were terrible but all of the companies using them learned from each other's mistakes and are continuing to improve.
Not all CVTs are created equal.
This makes sense. If you have driven a CVT from say Nissan, you know the initial take off is a bit sluggish. I would imagine the direct 1st gear helps with this big time.
You're insane at explaining such stuff god bless you !
I don't know about you guys but I think "Bucket" is a phenomenal name for a cat.
Thank you for making this channel Jason
Thanks for watching Ricardo!
Great job explaining what appears to be a complicated transmission.
Man! this is a brilliant solution!
That launch gear is gold!
What i am hoping is evolution of this hybrid transmission and want to see it become sports car transmission with 2 launch gears and faster CVT with actual smooth infinite ratios, not silly "fixed" ratios.
0-100 in 4/5 seconds and also 10-15L/100km
Jason! You should start making videos about how these new inventions in the automotive industry fit in place for the common consumer. I'd love to hear what you think of these many different new engines, transmissions, etc.
This actually gives a nice feeling to the car. I wish they used a launch gear in the Rav4 and Rav4 prime too (they don't have that nice direct feeling as in the new Corolla)
Food for thought....maybe Bucket should do an episode or two?
My solution for fuel economy is a Suzuki Alto 800 : simple, cheap and easy to maintain, with a fuel economy from 38-64 mpg (6.217 - 3.67 l/100km ). For daily use it feels great after the 24l/100km with my Ford Super Duty.
I love how the Cvt delivers power but I had a bad experience with a 2014 Nissan Murano and now my sister is getting about the same issues with her 16 Altima.
That is actually not terribly complex mechanically, very similar to the JATCO CVT in Nissans and Chrysler vehicles. The benefit here is that first gear allowing big torque loads, really cool!
This is such a brilliant system. The day strictly CVT came out, I was wondering why not combine them. Great video explaining it perfectly. I hope this transmission catches on. One thing you didn't mention was weight? I'm just going to assume it's heavier.
I bought a new 2023 corolla (2.0L) and the gearbox clunk (it clunks the moment i press or release the gas pedal) the dealer says its "normal" !!