Yeah, I was really happy with how those tests turned out. That's also why I tried to keep the chassis quite simple so it's clearer to see the CVT wheels inside.
@BananaGearStudios would be cool seeing the vehicle driving through some loose sand or dirt to test the cvt. But I agree the trailer and added weight does a great job of showing us how the transmission works
@@StreetSurfersAlex Probably not, I think there would be more power loss from multiple spur gears than a single pair of bevels. Also, it would be easy to incorporate a diff, further reducing power loss when steering. My guess is that the chain would droop down too much, causing reliability issues.
And what's even cooler is, that it doesn't use any electric parts to work. Purely mechanical. Never seen an automatic not use electric parts and sensors.
@@DarmiGamesCentrifugal 2 speed transmissions exist in Nitro powered RC cars, and don't use any electronics. They use a centrifugal clutch to engage second gear, and a one-way bearing to disengage first gear once second gear is engaged. A few manufacturers have also made 3 speed versions. The gear selection on these is determined by speed though, not load. The shift point can be adjusted manually, but if it's set to go into second gear at a certain speed, it will shift at that speed no matter what the load is.
this isnt what is defined as an "automatic transmission" but it is a ""CVT" aka continually variable transmission. "automatic" transmissions in vehicles are not designed this way other than snow mobiles and go karts
There's no actual rule that the line from the motor to the drive differential needs to be parallel with the road surface. You could have put the CVT on its side above the car and run the drive shaft down to the differential in the wheel base. Then you could have the car be as narrow as you wanted and have all the space in the world for steering.
That also was my first thought. But it would lead to the problem of keeping the chain in place, because this design relies on gravity to keep it where it is while standing still.
If the vehicle is heavy enough to make the horizontal torque less effective. In this case, the CVT is nearly 1/3 the weight, so the horizontal torque will be noticeable. The CVT on normal scooter is off center and not make any large effect.
I did consider that, though I thought the chain might slip off of the CVT wheels if I positioned it horizontally, as one of the replies already mentioned. Regarding the size, it might've made the car slightly narrower, but it would've made it a lot taller, so there was a compromise to make there. And doing that for the coupled CVT would've made the car ridiculously tall! But you're absolutely right that it would've had some advantages.
@@BananaGearStudiosthank you. It clearly would slip off horizontally. Comments section warriors are always "smarter" than everyone else, because they don't try the idea, they just say "do it" Not to mention the torque twist force that would be applied running the "chain" on its side above the frame of the vehicle.
Yeah, that's a nice idea! At this scale it might've made the car slightly bigger, and I was a bit worried that the chain would slip off the wheels if I put it horizontally. But it would definitely solve the ground clearance issues.
I would NEVER be able to even come up with this, let alone build it out of my own mind. Ur one of the best lego technic builders anyone can find on the internet.
@bannerman100 I'm not sure if the wiki link is incorrect, but in the wiki, it's just a depiction of a normal CVT with a chain. I mean, this Lego version of the CVT overcomes the drawbacks of a normal one. With only one drawback, which is the mechanic, but you could lubricate this one because it uses a chain now.
@TotoGeenen Yea, and this mechanism uses chains with a mechanism to slip them when needed and grip when not. making this mechanism superior. And I haven't seen such a mechanism upscaled and in action
Are a huge fanatic of vehicles and technology as a whole, this has really given me something fun to watch. I absolutely love this work, and I can’t wait to see how much better it can potentially get overtime
I'm glad to see this type of gearbox! I had a picture of that in my head for years, but never bothered in doing anything with it. I didn't think of automatic shifting tho. Great job, thanks for sharing!
Lay the CVT gears on their side spinning horizontally and feeding their torque directly down into diffs, no loss of ground clearance, no lift needed & diffs will shrink its turning circle.
I really like the idea. Looks like you could still scale up quite a bit... And you probably should. This principle comes to its maximum potential if you put this in a car sideways, and use the second CVT to turn a central driveshaft. By way of differentials you could make a 4WD vehicle that would have no problems making tighter turns, and then take it for an off-road test. At this scale, suspension travel and chassis torque could become an issue, since you'll probably need to make 10" studded wheels.
This is the brilliance of Lego. Every child should be given Lego like this as part of some kind of problem solving skills exercise as part of there learning in some way !
Electric motors don't gain much benefit from a variable transmission vs just choosing the right fixed ratio, because they generate their full torque at 0 rpm. You might be able to simulate a less torquey motor by using a clutch gear on it to limit the torque. Also the heavy trailer probably has a lot of rolling resistance which will prevent your automatic transmission from changing to a higher gear ratio as it gains momentum. You could try taking the rubber off the trailer wheels as solid wheels should roll more easily on a hard surface. Your automatic CVT is working nicely, but I think with some modifications the difference with vs without would be more dramatic.
I'm still curious about the stability of the output rotation speed. It seems like it's halting or at least not very continuous? I think you'd need several expanding wheels side by side and many more arms+hooks on each wheel (but not so many that the hooks that didn't grab the chain can knock the chain off a hook that did) to get a somewhat stable radius, which if my theory is correct should make it settle down. Would be pretty cool if we could find a solution to the chains gliding over the top of the hooks as well. spring-loaded hooks? Hooks that can bump forward a few degrees to fit between the chain links, if they're not pulling? I do realize we're straying into 3D printing and/or laser cutting territory here.
@16:00 a simple fix to stop the first set from unspooling under its own load would be a stronger rubberband. since its dealing with higher loads it will be more... strict when it decides to unfurl the arms to push ratios. since it lives under a higher load, the extra force to unfurl would be a simple fix for more usable ratios on the multiplied side.
Keep your lower gear ratio on the final output and gear up from the motor to the first cvt. This will strengthen the cvt because it will experience less turque
First idea, without watching any previous videos - what about centrifugal governor comparing speed of input and output? Stopped motor means no difference, so it's set by weight/spring to slowest gear ratio. As speed of motor increases compared to CVT output, governor will pull shaft and change CVT ratio to faster one. Second idea - sense tension of chain between motor and CVT, when it's too tight, switch to lower gear, when too loose, switch to higher gear :) Sensing could be done just by spring-loaded wheel pushing on chain, kind of like a tensioner.
Nice video. One thing you could have added to show how the two sequential CVTs interact is using your torque meter. Use one on the input, the second in the middle and a third on the output.
Send this cvt design to a car company dude, what this world needs is a CVT transmission that can be driven instead of belt driven so it can handle more torque
Toyota pretty much fixed cvt problems by giving it one actual gear (1st gear) for getting the car moving and then transfering to cvt for any other driving. This relieves stress that causes a lot of cvts to fail
stepping through the frames when the trailer gets accelerated is really interesting to wach. From this observation i also think that in the double cvt vehicle, the red cvt needs stronger elastic bands.
With how much weight the motor could pull with the CVT, I’d imagine you could make the car much bigger without any problems from the motor. Would probably allow for axles, a gearbox for reversing, and a better steering system
Experiment with different elastic strengths on each CVT, or use springs to push outwards instead of holding the pistons inward? Many things to think about, awesome design!
To handle such torque you should make simplified Vario transmission (gearbox without variators). Two motors and differential. 1st motor running full speed frontward, 2nd motor full speed backward and decreasing 2nd motor rpm will produce torque at the output of the gearbox and after getting to 1:1 ratio (with 2nd motor stopped) 2nd motor also starts to rotate frontward and output rpm is higher than motor rpm because thats how differential work, but you would need to operate rpm's smoothly with idk maybe lego mindstorms could do it? also 2nd problem can be spinning 2nd motor while passive (I've used worm gear to prevent this, but I was using high speed motors)
Is there a way to use a hollow shaft or maybe raise the rear portion up a bit and transmit from the output of the cvt via another chain drive to the drive axle?
what is the name of this Lego set? i remember when i was a boy one of my (rich) friend had a full set of pneumatic set and it was really awsome for tinkering. i see that your current set is more steered towards making vehicules and motorized stuff.
You could've circumvented the problem with the limited space a bit by laying the cvt on its side. It would allow you to use a differential gearbox in the back and a propoer steering mechanism in the front, and maybe even the reverse gear in the back.
I can't stand CVT transmissions. Unfortunately it seems to be what all manufacturers are moving towards. That being said. This is a super cool build. Great work 👏
They have already existed for years, and are terrible, unreliable, and depreciate harder than any other cars on the market. Great concept on paper, and in controlled demos... but in the real world they are an absolute disaster, and complete waste of money
@@Gazlene420 My 2019 Honda Civic with CVT begs to differ. It's saved quite a bit in fuel cost and I've had no issues. It's been quite a bit better than the Nissan CVT that I experienced from a few years before and I only have five years of history using one in a car. CVT's in many other lower torque applications (snow mobiles, bicycles, etc.) have been reliable for many years. I especially like the eCVT concept now being used in some vehicles (mostly hybrids) where you have no steel segmented belts and the hydraulic pressure actuated pully. Instead you have a torque variator using low power electric motors controlling the high torque variable speed by using a planetary gear controlling power from both ICE motor and electric motor.
I am going to try and make a 3d model using a cvt like this. I’m gonna try and make the parts 3d printable parts. Hopefully I can build the Lego version of this correctly.
Good luck! The one downside of building it from Lego was how big the CVT had to be, but 3D-printing it you might be able to make it small and compact enough to fit into all kinds of machines!
Why didn't you just rotated the by CVT 90° on the long axis and put it on top of the car to eliminate ALL ov your problems? You already have gears between the CVT and the wheels, so that can't be the reason.
Mount the transmission so it’s lying flat above the frame and you can drive all 4 wheels with differentials in addition to being able to stack multiple CVTs on top of each other to give a much larger gear ratio. If I had the resources available I would make it myself to show you what I mean
IDEA for future. To get different driving styles, the tension of the bands could be increased or decreased, depending on the intent of the vehicle it is being fitted too. Weather it is for more driving and getting up to speed, and if it needs to be as low as possible as much as possible. So I could easily see this in a utv or something, pure mechanical so there is less electronics to work on.
Thanks, I really appreciate that! One thing that really helps me is to always be working on multiple ideas/videos concurrently, so that if I run into a problem on one video I can always work on something else meanwhile.
@@BananaGearStudios I will try that one in the future. the other problem I have is production quality ,although I use a good camera it doesn't always look as good as I want it to, and especially with lighting
enjoyed the video! you should make one about seeing if graphite or WD-40 on the axels would help lower friction leading to better results! that could be neat.
I know you've said, this will be the last video on this CVT, but I really wanna see you make a working fully fledged RC car. Big 4WD offroader with the CVT, to really show it's limits.
It would be cool to see you make more of these than link them together to get even more variation in the speed and torque Edit: I dident watch long enough to see you did that
This is very interesting. What would happen if you scaled it up and used it in a real car? I think that the drive would be uneven and produce driveline vibrations,
Did you come up with this from an existing transmission? Because if not you might be a genius lol. I'm prob wrong but I feel like this could be applied to an actual car and solve the belt/power problem.
Normally not a fan of Belt CVT´s, but this one surely is stronger than the garbage Nissan uses :) In real cars iam more into the eCVT Toyota Hybrids use that have a differential at their core. Maybe you could replicate one in Lego?
can you add a link to "the previous video" in the description? preferable a non-shorts version as well if its a short. edit: realized he just used a different feature to add the link. adding it to the actual description would still be much appreciated though. edit2, nevermind. apparently the one linked is mostly unrelated. edit3:skip to 3:10 in the linked video, theres just a really long intro.
only because of two things, slippage and the satisfying upshift sounds of a traditional transmission. The slippage can be somewhat mitigated by adding little griping slots into the pulleys and for the sound it can be added just by programming the TCU differently to act like a regular transmission from going to specific types of gear sizes really fast instead of slowly.
@@Abe8816 Another reason is most mechanic shop don't have the skill of maintaining this new gear box. (may change when this kind of gearbox becomes more popular)
That's really neat. Any idea what the ratio is between the highest and lowest gear? EDIT: Nevermind! I paused the video at about the 10 minute mark to ask this question, literally 20 seconds before you answered it in the video.
the trailer test was definitely the best way to visualize the CVT, its easy to see it slowly change gear as it gets up to speed
Yeah, I was really happy with how those tests turned out. That's also why I tried to keep the chassis quite simple so it's clearer to see the CVT wheels inside.
@BananaGearStudios would be cool seeing the vehicle driving through some loose sand or dirt to test the cvt. But I agree the trailer and added weight does a great job of showing us how the transmission works
Why not roll the gearbox on its side, and transmit power to the wheels using a bevel gear? No ground clearance issues then. :)
Losing some power through the bevel gear I guess
@@StreetSurfersAlex Probably not, I think there would be more power loss from multiple spur gears than a single pair of bevels. Also, it would be easy to incorporate a diff, further reducing power loss when steering.
My guess is that the chain would droop down too much, causing reliability issues.
That's what I was thinking. Stack that thing vertically.
It might make it too wide, the proportions looking weird.
Pretty cool to see harvester here lol
I've seen demonstrations of manual transmissions before but this is the first time I've actually seen someone make an automatic one out of Lego.
Yes but only automatic in the way it functions. It's a cvt so it does not work like a traditional "automatic".
And what's even cooler is, that it doesn't use any electric parts to work. Purely mechanical. Never seen an automatic not use electric parts and sensors.
@@DarmiGamesCentrifugal 2 speed transmissions exist in Nitro powered RC cars, and don't use any electronics. They use a centrifugal clutch to engage second gear, and a one-way bearing to disengage first gear once second gear is engaged. A few manufacturers have also made 3 speed versions.
The gear selection on these is determined by speed though, not load. The shift point can be adjusted manually, but if it's set to go into second gear at a certain speed, it will shift at that speed no matter what the load is.
this isnt what is defined as an "automatic transmission" but it is a ""CVT" aka continually variable transmission. "automatic" transmissions in vehicles are not designed this way other than snow mobiles and go karts
@@bmxscape I know, some nissans have cvts, but it's stil really cool, because if I'm not wrong, even those use electronics to control it.
There's no actual rule that the line from the motor to the drive differential needs to be parallel with the road surface. You could have put the CVT on its side above the car and run the drive shaft down to the differential in the wheel base. Then you could have the car be as narrow as you wanted and have all the space in the world for steering.
That also was my first thought. But it would lead to the problem of keeping the chain in place, because this design relies on gravity to keep it where it is while standing still.
If the vehicle is heavy enough to make the horizontal torque less effective. In this case, the CVT is nearly 1/3 the weight, so the horizontal torque will be noticeable. The CVT on normal scooter is off center and not make any large effect.
I did consider that, though I thought the chain might slip off of the CVT wheels if I positioned it horizontally, as one of the replies already mentioned. Regarding the size, it might've made the car slightly narrower, but it would've made it a lot taller, so there was a compromise to make there. And doing that for the coupled CVT would've made the car ridiculously tall! But you're absolutely right that it would've had some advantages.
Rather than on the side they could be at a 90° angle from each other, and at a 45° from the center of the chassis.
@@BananaGearStudiosthank you. It clearly would slip off horizontally.
Comments section warriors are always "smarter" than everyone else, because they don't try the idea, they just say "do it"
Not to mention the torque twist force that would be applied running the "chain" on its side above the frame of the vehicle.
Maybe rotate the gearbox by 90 degrees, so spinning is in horizontal plane? Since you already use gears cvt -> wheels
Yeah, that's a nice idea! At this scale it might've made the car slightly bigger, and I was a bit worried that the chain would slip off the wheels if I put it horizontally. But it would definitely solve the ground clearance issues.
I would NEVER be able to even come up with this, let alone build it out of my own mind. Ur one of the best lego technic builders anyone can find on the internet.
Thank you, I really appreciate that!
No, so sad that you won't make anymore videos about it. I really would like this concept to get scaled up, made smother and put into a vehicle.
I'm sure I'll find some uses for it in other videos, but after 3 months of videos on this I've got lots of other ideas I'm excited to work on :)
Surely, this works on the same principle as the DAF Variomatic transmission ?
en.wikipedia.org/wiki/Variomatic
@bannerman100 I'm not sure if the wiki link is incorrect, but in the wiki, it's just a depiction of a normal CVT with a chain. I mean, this Lego version of the CVT overcomes the drawbacks of a normal one. With only one drawback, which is the mechanic, but you could lubricate this one because it uses a chain now.
@@kaspis0019The DAF Variomatic used rubber belts. Downside being they wore down quite quickly, but on the other hand, were cheap to replace.
@TotoGeenen Yea, and this mechanism uses chains with a mechanism to slip them when needed and grip when not. making this mechanism superior. And I haven't seen such a mechanism upscaled and in action
Are a huge fanatic of vehicles and technology as a whole, this has really given me something fun to watch. I absolutely love this work, and I can’t wait to see how much better it can potentially get overtime
Thank you, I'm glad you liked it!
@@BananaGearStudios the best idea I can think of to improve it would be to add a flywheel so it has more momentum and a smoother output
9:08 perfect Star Wars reference
I'm glad to see this type of gearbox! I had a picture of that in my head for years, but never bothered in doing anything with it. I didn't think of automatic shifting tho. Great job, thanks for sharing!
Lay the CVT gears on their side spinning horizontally and feeding their torque directly down into diffs, no loss of ground clearance, no lift needed & diffs will shrink its turning circle.
I really like the idea. Looks like you could still scale up quite a bit... And you probably should. This principle comes to its maximum potential if you put this in a car sideways, and use the second CVT to turn a central driveshaft. By way of differentials you could make a 4WD vehicle that would have no problems making tighter turns, and then take it for an off-road test. At this scale, suspension travel and chassis torque could become an issue, since you'll probably need to make 10" studded wheels.
Those are lots of great modifications I could make, thanks!
This is the brilliance of Lego. Every child should be given Lego like this as part of some kind of problem solving skills exercise as part of there learning in some way !
Electric motors don't gain much benefit from a variable transmission vs just choosing the right fixed ratio, because they generate their full torque at 0 rpm. You might be able to simulate a less torquey motor by using a clutch gear on it to limit the torque.
Also the heavy trailer probably has a lot of rolling resistance which will prevent your automatic transmission from changing to a higher gear ratio as it gains momentum. You could try taking the rubber off the trailer wheels as solid wheels should roll more easily on a hard surface.
Your automatic CVT is working nicely, but I think with some modifications the difference with vs without would be more dramatic.
I'm still curious about the stability of the output rotation speed. It seems like it's halting or at least not very continuous? I think you'd need several expanding wheels side by side and many more arms+hooks on each wheel (but not so many that the hooks that didn't grab the chain can knock the chain off a hook that did) to get a somewhat stable radius, which if my theory is correct should make it settle down.
Would be pretty cool if we could find a solution to the chains gliding over the top of the hooks as well. spring-loaded hooks? Hooks that can bump forward a few degrees to fit between the chain links, if they're not pulling?
I do realize we're straying into 3D printing and/or laser cutting territory here.
@16:00 a simple fix to stop the first set from unspooling under its own load would be a stronger rubberband. since its dealing with higher loads it will be more... strict when it decides to unfurl the arms to push ratios. since it lives under a higher load, the extra force to unfurl would be a simple fix for more usable ratios on the multiplied side.
Keep your lower gear ratio on the final output and gear up from the motor to the first cvt. This will strengthen the cvt because it will experience less turque
Wow I never thought of this mechanism for a CVT in LEGO Well done 👍
Why not mount the cvt vertically, as in do some right angle connections to the input and output axels are vertical
I have loved this CVT video arc. Thank you.
Thanks, I'm glad you liked it! Now the next arc begins!
I was waiting for it !
First idea, without watching any previous videos - what about centrifugal governor comparing speed of input and output? Stopped motor means no difference, so it's set by weight/spring to slowest gear ratio. As speed of motor increases compared to CVT output, governor will pull shaft and change CVT ratio to faster one.
Second idea - sense tension of chain between motor and CVT, when it's too tight, switch to lower gear, when too loose, switch to higher gear :) Sensing could be done just by spring-loaded wheel pushing on chain, kind of like a tensioner.
Nice video. One thing you could have added to show how the two sequential CVTs interact is using your torque meter. Use one on the input, the second in the middle and a third on the output.
This is some of the coolest shit I've ever seen. Seems way more intricate than anything I've even seen from Brick Technology. Great work!
Send this cvt design to a car company dude, what this world needs is a CVT transmission that can be driven instead of belt driven so it can handle more torque
Toyota pretty much fixed cvt problems by giving it one actual gear (1st gear) for getting the car moving and then transfering to cvt for any other driving. This relieves stress that causes a lot of cvts to fail
stepping through the frames when the trailer gets accelerated is really interesting to wach.
From this observation i also think that in the double cvt vehicle, the red cvt needs stronger elastic bands.
i think you could solve the speed problem by having different band resistances on each cvt
Can't you rotate the 90° the CTV , put it on-top of the frame and connect it to a differential?
why can't you make the CVT horizontal? I would think that might make space on the bottom for a differential.
Okay what the heck this is actually the coolest Lego technology I’ve ever seen
With how much weight the motor could pull with the CVT, I’d imagine you could make the car much bigger without any problems from the motor. Would probably allow for axles, a gearbox for reversing, and a better steering system
Experiment with different elastic strengths on each CVT, or use springs to push outwards instead of holding the pistons inward? Many things to think about, awesome design!
To handle such torque you should make simplified Vario transmission (gearbox without variators). Two motors and differential. 1st motor running full speed frontward, 2nd motor full speed backward and decreasing 2nd motor rpm will produce torque at the output of the gearbox and after getting to 1:1 ratio (with 2nd motor stopped) 2nd motor also starts to rotate frontward and output rpm is higher than motor rpm because thats how differential work,
but you would need to operate rpm's smoothly with idk maybe lego mindstorms could do it?
also 2nd problem can be spinning 2nd motor while passive
(I've used worm gear to prevent this, but I was using high speed motors)
This is amazing work, thanks for sharing.
I am both sad and excited to see you switch away from this particular project.
I hope to see more with it eventually.
Thanks, it's nice to hear you've enjoyed these last few videos! And yeah, I'm sure it'll come in handy in some future videos.
Is there a way to use a hollow shaft or maybe raise the rear portion up a bit and transmit from the output of the cvt via another chain drive to the drive axle?
WOw dude. What an explanation, Kudos!
Thank you!
You could add weights to the imput "pully" so that as rpms increase the weights would pull the pully open and change the gearing to go faster
what about combining two or more smaller mechanisms to reduce it's size or make it more compact?
Wow, cool design.
Is there a different to a varimatic in a 50ccm motorscooter?
Or is it a new invention?
Awesome man. I hope your channel does really well!
I always wondered if coupling multiple cvt would work. Been wanting to get more top end out of my gokart without loosing any bottom
what is the name of this Lego set?
i remember when i was a boy one of my (rich) friend had a full set of pneumatic set and it was really awsome for tinkering. i see that your current set is more steered towards making vehicules and motorized stuff.
You could've circumvented the problem with the limited space a bit by laying the cvt on its side. It would allow you to use a differential gearbox in the back and a propoer steering mechanism in the front, and maybe even the reverse gear in the back.
I can't stand CVT transmissions. Unfortunately it seems to be what all manufacturers are moving towards.
That being said. This is a super cool build. Great work 👏
For the highest speeds, try it with a suspended chassis. Max speed is always going to be gravity assisted: going downhill.
really cool but does the cvt still carry any sort of meaningful advantage over a standard transmission when you take size/complexity into account?
I wanna make one myself, could you plz provide instructions?…
Can you control the rubber bands? Making them tighter on demand.
why put the fearing not horizontal ON the chassi ?
Waiting for the CVT car 🎉🎉🎉
They have already existed for years, and are terrible, unreliable, and depreciate harder than any other cars on the market.
Great concept on paper, and in controlled demos... but in the real world they are an absolute disaster, and complete waste of money
@@Gazlene420 My 2019 Honda Civic with CVT begs to differ. It's saved quite a bit in fuel cost and I've had no issues. It's been quite a bit better than the Nissan CVT that I experienced from a few years before and I only have five years of history using one in a car. CVT's in many other lower torque applications (snow mobiles, bicycles, etc.) have been reliable for many years. I especially like the eCVT concept now being used in some vehicles (mostly hybrids) where you have no steel segmented belts and the hydraulic pressure actuated pully. Instead you have a torque variator using low power electric motors controlling the high torque variable speed by using a planetary gear controlling power from both ICE motor and electric motor.
Ncm! I've never seen that unit before, and it's ADORABLE!
I am going to try and make a 3d model using a cvt like this. I’m gonna try and make the parts 3d printable parts. Hopefully I can build the Lego version of this correctly.
Good luck! The one downside of building it from Lego was how big the CVT had to be, but 3D-printing it you might be able to make it small and compact enough to fit into all kinds of machines!
You can put the two cvts in a v formation and save a lil space for the batter and motor
very interesting! why angle it or even go vertical?
CVTs may not be reliable in real life, but they are mesmerising to watch
install the CVT horizontally on top with an angle drive you will be able to more easily make room for the steering and the gearbox
Why didn't you just rotated the by CVT 90° on the long axis and put it on top of the car to eliminate ALL ov your problems? You already have gears between the CVT and the wheels, so that can't be the reason.
Wouldn't mind another video on this, it's pretty interesting and I'd like to see you try to optimise it
Mount the transmission so it’s lying flat above the frame and you can drive all 4 wheels with differentials in addition to being able to stack multiple CVTs on top of each other to give a much larger gear ratio. If I had the resources available I would make it myself to show you what I mean
Maybe something to make the reverse work would be a motor to sort of lock the chain and/or the size of the cvt wheels
I want to get some micro lego motors to power my builds what micro motors should I get?
That’s amazing. Definitively the kind of lego set I would have loved to get when I was a kid
this is exactly the type of video for wich I subscribed ^^
Thank you, glad to hear it!
Could use different rubber strengths in both CVT to manage max torque from desd stop to min torque while highest speed.
Great video to visualize CVT technology. 👏🏽
IDEA for future. To get different driving styles, the tension of the bands could be increased or decreased, depending on the intent of the vehicle it is being fitted too. Weather it is for more driving and getting up to speed, and if it needs to be as low as possible as much as possible.
So I could easily see this in a utv or something, pure mechanical so there is less electronics to work on.
That's a nice idea!
@@BananaGearStudios Thanks!
is it changing gears based on centrifugal forces?
Wow! Awesome job! Very snazzy!
a fun experiment would be making a CVT with a ball and a roller that using the geometry of the ball to transfer ratios.
how do you consistently make such great and interesting content also this is a really cool build
Thanks, I really appreciate that! One thing that really helps me is to always be working on multiple ideas/videos concurrently, so that if I run into a problem on one video I can always work on something else meanwhile.
@@BananaGearStudios I will try that one in the future. the other problem I have is production quality ,although I use a good camera it doesn't always look as good as I want it to, and especially with lighting
enjoyed the video! you should make one about seeing if graphite or WD-40 on the axels would help lower friction leading to better results! that could be neat.
Amazing project!!
A fix for the turning issue you could make the rear tires turn as well, that should help a lot, but is also complex
Nice!!! 😀Back in the 70's I also built Lego gearboxes (and much more).
presumably the elastic band in the CVT represent a power drain to hold them in a more stretched length
Dont you mean i put a car on my most complex lego transmission
Why no putting it horizontally?
I know you've said, this will be the last video on this CVT, but I really wanna see you make a working fully fledged RC car. Big 4WD offroader with the CVT, to really show it's limits.
Really cool series , I learnt a lot! Thanks
fantastic vid and an awesome project my dude.
In theory could you replace the rubber bands with actuators so u can control the gearing manually depending on the speed/torque u need
Nice, proper LEGO!
It would be cool to see you make more of these than link them together to get even more variation in the speed and torque
Edit: I dident watch long enough to see you did that
Ah i have been waiting for this video
I like your videos very much you are make a very quality videos
why not just add another hook on the other side of each arm, so it can go in reverse by having the bottom part of the chain in tension?
use rubberbands instead of chain and youll be able to downsize the cvt significantly and itll be smoother and more efficient
Should have made a solid connection, i think it would improve efficiency with acceleration, since its only one trailer
This is very interesting. What would happen if you scaled it up and used it in a real car? I think that the drive would be uneven and produce driveline vibrations,
GREAT stufffff!
Did you come up with this from an existing transmission? Because if not you might be a genius lol. I'm prob wrong but I feel like this could be applied to an actual car and solve the belt/power problem.
Cool Video 😊
Thanks!
Normally not a fan of Belt CVT´s, but this one surely is stronger than the garbage Nissan uses :)
In real cars iam more into the eCVT Toyota Hybrids use that have a differential at their core. Maybe you could replicate one in Lego?
can you add a link to "the previous video" in the description? preferable a non-shorts version as well if its a short.
edit: realized he just used a different feature to add the link. adding it to the actual description would still be much appreciated though.
edit2, nevermind. apparently the one linked is mostly unrelated.
edit3:skip to 3:10 in the linked video, theres just a really long intro.
Such a cool Video! Thank you
Nice piece of creation!
But CVT is classified as the worst possible transmission for cars by most users.
only because of two things, slippage and the satisfying upshift sounds of a traditional transmission. The slippage can be somewhat mitigated by adding little griping slots into the pulleys and for the sound it can be added just by programming the TCU differently to act like a regular transmission from going to specific types of gear sizes really fast instead of slowly.
@@Abe8816 Another reason is most mechanic shop don't have the skill of maintaining this new gear box. (may change when this kind of gearbox becomes more popular)
@@lamttl True, but TH-cam is an awesome place and I my self have learned from knowing nothing about cars to being able to fully rebuild a transmission
Impressive. Now make a dualclutch 7 speed transmission
That's really neat. Any idea what the ratio is between the highest and lowest gear? EDIT: Nevermind! I paused the video at about the 10 minute mark to ask this question, literally 20 seconds before you answered it in the video.
A Dual-motor e-CVT design with a planetary gearset might also work, but it'll probably need logic.