The Coolest Transmission You've Never Heard Of... The Ratcheting CVT
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- Опубліковано 20 вер 2024
- When I was 16, I thought I had designed something that would be revolutionary, turns out (heh) I was not only wrong about that, but also wasn't the first guy to have that idea. I wish I still had my original build to show you guys, but since I didn't I went and designed another one, but better!
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Very cool. I don't care if something has already been invented. That doesn't make your own thought process to develop it on your own any less impressive. Excellent work.
Unless his story is bs and hes just baiting and clicking lmao lol ,seems funny to me lol all I saying ..
I am an intelligent man. You’ve made me feel like an idiot and I appreciate that. Don’t waste your talent and keep striving to change the world.
We need more people like you man.
Never stop innovating.
I have done exhaustive research on CVT's at the USPO. This is a rather old and well known "patented" design. It is called a Zero-Max. It was invented well before 1994.There are many variations of the reciprocating concept. CVT's, PCVT's, IVT's, and or PIVT's have been the quest of many inventors for many years So elusive has the search been for one that fills the criteria that you accurately described, that it has been termed "The Holy Grail" of transmissions.
I don’t understand a single thing you say, but everything you make is awesome
As a 62 year old mechanical engineer, I've seen these types of variable speed drives (VSDs) over the years. One name for them is an impulse drive. They employ a series of crank-rocker mechanisms, each of which is at a certain fixed phase angle with the others. Each crank-rocker employs some sort of an overrunning clutch that drives the output shaft, e.g., a wrap-spring clutch, a friction ratchet w/ spring-loaded pawls or balls, etc. The ones I've seen have a hand crank that turns a power screw which varies the distance between the two ground revolute joints to vary the output shaft speed. Some issues with these types of VSDs are: 1) With a constant input shaft speed, the output shaft speed varies. This results in torque fluctuations. Depending on the load being driven, this can result in fatigue failures. 2) The overrunning clutches are frictional devices with inherent losses that decrease overall drive efficiency. 3) Each crank-rocker mechanism has a non constant mechanical advantage which further decreases the overall drive efficiency. 4) High cost. For applications where non constant output shaft speeds aren't a major concern and driven loads aren't large, e.g., conveyor belts, rock-cutting wire saws, etc., they work fine.
You'd better patent that. Eaton has his name on heavy truck transmissions. You could have your own name on the shifter.
[Insert Name] Transmissions.
Or make it open source that noone could patent it.
@@itTchin hey, is your car open source? lemme borrow it.
@@jmh1189 hey are the AMD cards open source? yea. what's your fing point.
@@jmh1189 "Dang GTA players. This is real life!"
Gytis leave AMD out of this. Have you made a Vega 56 by yourself?
I've owned a Volvo 340(GL) with a Variomatic (CVT). Fun at the stoplight! And it drives awesome.
Be glad for your ingenuity. Not every concept is a moneymaker but the mental exercise is its own reward.
talking hands. truly amazing.
When i was 13 i thought i had invented a CVT as well, long story short, my father had automotive engineer acquaintances and i showed him my " no shift" transmission.
I was crushed when my fathers friend informed me that it had been invented years prior, this being 1968.
I was totally bummed, I didnt see a practical version until i was in my 40's and it brought back pleasent thoughts...
Ronald Reed Invented by others doesn't mean you have to give it up. If you truly like it, make it real.
Did you have prior knowledge of the CVT? If not then you did in fact invent it. That accomplishment is yours. It doesn't matter that someone else invented one or when they did it.
I remember “inventing” a ratchet style CVT (I called it a reciprocating CVT) as a teen sometime around 1991. I then found that someone had patented one nearly identical 90 years before.
It still was neat, I spent a while trying to refine it but it was difficult. My final design was something like halfway between this thing and a Torsen differential and I just didn’t have the fabrication skills.
I 100% understand this feeling!
you should replace the ratchets with one way sprags it will be much smoother and longer lasting and you know it will handle the power because they already use them in transmissions
An extremely clever design! I was going to suggest that this machine isn't strictly a pure CVT because there's only a finite number of teeth the ratchet will travel through for a discreet range of crank displacements. But then you already knew that of course! Haha
So cool.
BUT!!!!! surely you could utilise some sort of one way clutch or lap band kind of mechanism to grab the output shaft instead of a ratchet? I suppose that kills the whole positive engagement thing.
@5:30 reminds of why we still don't have quiet vacuums. Because consumers equate noise with suction power.
This looks like an ideal app for a frontwheel drive car
Holy hell, dude. Love your obsession , thanks for sharing
Wow amazing work. That adjustment mechanism is brilliant.
That's a very fine bit of engineering. I'm especially impressed by that adjustment knob. To me, it seems almost like magic. To make this an automatic, you would maybe use a computer controller with a servo to do the adjustment knob action. P.S. I subscribed! thumbs up for you.
The world needs more people like you
It's kind of funny you made it green because, this design is actually used in John Deere seeding equipment to provide variable speeds for the metering roller drives.
As a 50-year old Mechanical Engineer, I'd just like to say that you are an amazing young man and you should ignore all of your naysayers. It's easy to sit back from the safety of basically an anonymous position behind a keyboard on the Internet and criticize someone else's work. It's a whole other matter to pull something original out of thin air, make it work, record a video on it, and be brave enough to put it out there for all of the world to see. Those "armchair" engineers that have never developed anything original and/or published for the entire world to critique have no right to criticize or be a jerk. Best wishes to you and I believe you are on the right track to go far in life.
Craig Lane i am thinking of going to a mechanical engineering college/university (i don't really know the difference) or whatever you call it (PS i don't live in the US so it's a bit different) i have to say I'm interested into mechanics and i am a young car guy but i'm worried i won't be able to get it through the college as i lack practical knowladge. I do have about a year time till i head for college but I'm still scared i would fail there. (i live in a flat so i don't have much place to work with) what do you think? Any tips? Or should i choose some other direction after high school? Thanks.
As long as you are good at math or have the ambition to work yourself until you are good at it, and have an interest in physics, you will do great. Always try to pay attention to the details, be thirsty for knowledge, and make friends with the old guys when you get a job so you can inherit their tribal knowledge of whatever systems you are working with.
But im jelous.
As Megalonyx said, math is key. Being able to take concepts of science and math and make them make sense is the root of engineering. There are a lot of resources that were not around even a decade ago. Some make it easier to do homework, but really invest effort into understanding the principles instead of just getting homework done.
As a car guy myself I have seen people get into mechanical engineering when what they wanted was really a mechanical technician course focused on repair, tuning, or racing. Find out what you want to do after college and see what that takes. What ever path you follow know that people smarter have failed and people less smart have succeeded. The choices you make to the work you put in is the determining factor.
The best professors I had in engineering college were the ones that had to work harder just to understand. The chair of the department once told us, "I have had to make all of the mistakes just to understand before I was able to teach anyone the concepts we will cover in this course." Do not have doubt. Have ambition, drive, and understanding of yourself.
I am a 50 year old software engineer and I started to build a 3D printer.
It became a steep learning curve; electronics and mechanics.
I learned more in a year than whatever any school taught me.
So my advice: Start at some school that also endorces some technical
challenges that students aspire. Build a 3D printer or a rocket or whatever.
Keep your mind busy and I hope you have your parents, supporting you
in whatever you endeavor. Because, that's how you grow.
Theory is a nessecary evil to the practical application.
But it is adament to start with practical application at the ealiest age as possible.
I sometime wish, I could have started with this stuff at an earlier age.
I wish, my parents would have been more supportive.
But life offers you a few chances. Not many at all.
Grab them.
One more example:
I learned to play the guitar, but I never learned as much, until I started
to play in a band.
However .. if I did not learn the basics, I would never have played in a band.
I hope this answers your question.
I feel like this thing needs a flywheel, it'll smooth out the output.
I kinda thought that a one way bearing would work better than a ratchet system
What if you took two torque converters and put channels between them with electronic valves.
Let's say there were 5 channels which fluid could flow from input tc to out put tc. If only one valve is open would you get higher pressure less flow volume equivalating to higher tourqe less speed. If you have all five valves open would it be higher flow less pressure equivalating to higher speed less torque.
@@robertolivarez5742 , , ,, , , , , ,. , ,, , , ,, , , , , , ,
@@robertolivarez5742 , , ,, , , , , ,. , ,, , , ,, , , , , , ,
Torque converters are way too inefficient, heavy, need nasty fluid, and the power would have a slow response. No thanks. Torque converters are the worst component of automatic transmissions.
paint some lines on the output shaft so we can more easily see how fast its turning
It needs a whirly wheel like thumbs.dreamstime.com/z/hypnotic-spiral-disc-11529974.jpg
Great job buddy. I'm an inventor too and have lost faith in others for the same reasons. You can lead a horse to water but a lot of this planet won't drink it unless its in a pretty cup. Keep up the awesome work and protect your ideas.
The pain of finding out your idea isn't original is truly immense
What university do I have to enroll to be in your class professor?
Dude this is awesome, u should let my favorite Canadian engineer AvE get his hands on it to build a version for my farvoite go-cart builders Cars and Cameras to put it in practice. That would be an awesome collaboration.
I have my doubts that AVE would be interested, but I would love to have that opportunity
You never know till u try :)
Amazing,this guy should be working in NASA
I worked out a CVT using the same as your earlier approach, maybe a bit earlier, but l also ran into that patent.
I didn't come up with the neutral ability. But, I saw a conventional CVT connected to a sun and planet gear that provided neutral and reverse.
Nicely done.
I have no idea why im watching this. Which is quite the compliment of your presentation skills.
Well first you should print a cover for your outlets on that back wall.
Gear up dude^^
awesome vid , subbed
Very clever. Unfortunately would generate a great deal of wear on contacting faces and thus material & maintenance costs would be high as well as lubricity issues.
Yeah the thing wouldn't last any longer than a normal belt-based CVT.
hi new engineering metal required can be mass produced
hahahaha
This is freaking amazing.... You thought of it when you were 16!! You rock.....
And wow! You started giving explanations too.... 1 million views... I told ya! I really really hope you get more views and success... Continue the good work!... More power to you!
P. S. Could you please suggest some books for learning basics of gears and mechanisms...
You should look into replacing the ratchets with Sprag clutches! They function the same way as a ratchet but with much smoother operation, and are used in automatic transmissions, helicopters, and a variety of proven heavy duty applications!
Keep the vision! NEVER STOP INVENTING! I discovered Graphene in 1974 (using the pencil and tape method) same way as Geim and Novoselov did in 2010. But at age 15 I had no idea what is was, but it was cool, litterally! My science family and teachers were stumped. At 16 I invented a 6 cycle engine that vaporizes fuel in a "decompression stroke". These are just now under consideration and I'm 59 now. I'm doing two new types of amazing 3D printers right now that are mind blowing. So when you think you are ahead of the curve with innovations... send me a PM...
Thanks for this great video. The concept never dawned on me until I saw a demo of the original (I think). The implementation seemed a bit awkward, so I started thinking of ways it could be improved.
So, I figured going from reciprocating to rotational then back to reciprocating motions is a bit wasteful, so why not cut out the middleman? The crankshaft gets relegated to timing and accessories, while the power comes directly from the reciprocating pistons. A proportioning linkage enables variable output stroke, and the ratchets (I think they called it an over-running clutch) do the rest. Hmmm... I might have to work on a model.
was thinking the same, his design looks more like an engine than a transmission, what if instead of the connecting there was a mechanism similar to this that connects the piston to the crankshaft that changes speed. I think il think about this some more too, possibly make a model
I think lexus already has a variable displacement engine, check it out on engineering explained's channel, it looks a bit similar to this
I think there was a British transmission design from the 50s or 60s I remember seeing somewhere that took the reciprocating motion of the pistons and used that to power a ratcheting cvt. I don't remember where I saw it though.
Belt based CVTs usually have the pulleys both vary inversely to maintain the distance between the shafts.
Im guessing its not a full CVT because of two things:
1) It only transmits power in discrete chunks for each ratchet step.
2) Due to it's fixed lever design it will never achieve a 1:1 gear ratio.
Another thing is that it does not really transforms torque that much, so for this transmission the lower output spin ratio does not necessarily mean a higher torque output, the torque in this thing is practically fixed.
Some very good observations!
Gear Down For What? Thanks!
If you add more doohickeys the the thingamajig will it have more variables?
yes
Welp that's sure descriptive. " add more doohickeys the the thingamajig"
WindfallX YT if you thing that's bad you wouldn't be able to understand AvE
but then you need to increase the amount of jingawongas....
It would also be able to take on more killerwasps before dying
Nature boy reference was priceless!
CVT is the solution, that is so obvious to me. It's just a matter of continuous improvement.
I also have two inventions in mind that I am sure are solid. But I am discouraged to try to get anything patented etc.
as a nissan tech im glad you touched on programmed shift points in cvts
"Shift points" Otherwise known as a programmed miss in the fuel system.
FordPower5288 more like times ratio changes in the cvt as opposed to continuously changing them per the name suggests
@@superTomwins maybe they changed it but before it was just a programmed miss to make people think it's shifting. To be fair I've been out of the auto industry for a while now.
As a Nissan tech you should hate that horrible jatco cvt they use. 😂😂😂
@@punkrocker10115 I am not a fan of CVTs as it is. In automotive they have been nothing but problems. So far CVTs are like communism. Great in theory, horrible in practice. They are crap for any vehicle with any kind of power, only good for econo-boxes. Have been screwed up because then general public has no idea how they work and refuse to listen.
I'm curious what your elevator pitch would be for this thing
Very cool design. The ratcheting mechanism is definitely the biggest issue and wear point with this. The best CVT design that I have seen is the style used in new farm tractors. They use hydraulics and planetary gears. The power is split after the flywheel. it runs a hydraulic pump and spins a shaft attached to the sun gear or a planetary gear set. A hydraulic motor is then used to spin the ring gear at different speed. The planet carrier is what is ultimately run to the output. Different manufactures have a few different variations on this, but that's the basic idea. Its definitely something that is cool to check out if your into this kind of stuff.
Great video... My only suggestions... For fun, film lego people in stop motion... chasing around the ball bearings with brooms or hockey sticks, Maybe come on scene in firetruck or wrecker or, or... Good job.
Impressive stuff dude, keep it up
Spanky?
Was it an impostor because of the ratchets and their own inherent inefficiency or rather their output rotary motion not being smooth?
Cars with a gear lever that have... no gears? I'm in.
So, I'd say the finite number of teeth on the ratchet mechanism is why it isn't really continuously variable. Until the first tooth in engaged, no movement at all will occur up until that point. Suddenly with teeth engaging, the output will move by 3 teeth angles per input revolution, psuedo gear 1 after neutral, then all variations up until two teeth engage are the same, until the gear ratio suddenly doubles, psuedo gear 2, and so on until the most teeth passed possible per revolution of the ratchet. So realistically, your model probably only has 4 gear ratios plus a neutral. Smaller teeth could increase this number but make it fragile, replacing the ratchet with a one way bearing with little play could dramatically increase the "continuous-ness" of this mechanism.
For your final drive look into the concept of sprags. Reduce wear and ratcheting noise. There is a very simple design consisting of an inner race with ramps a cylinder roller and flat metal formed into a zigzag spring to keep the roller pushed up the ramp. The outer race is smooth. Going the active direction the roller pushes against the spring and down the ramp. Try to reverse and spring pushes up the ramp and wedges against the ramp and outer race and stops the rotation. Very quiet, very smooth and silent.
UA-cam: Have you ever wanted to learn about a transmission?
Me: No????
UA-cam: I hear ya bud
TF is that profile pic??
@@jared2071 yes
i don't understand anything that's being said, but i like the thing, so i don't care.
Long time ago I owned a Subaru Justy with their CVT. It was a wonderful idea, with a mediocre implementation. The bands ended up wearing "grooves" in the cones, which made the transmission tend to "stick" in certain commonly-used ratios. So when you were trying to change power levels, it would tend to "stick" at certain ratios before almost clunking out of the groove and introducing a herky-jerky motion.
Anonymous Freak well simple, all you have to do is lubricate the cone!
Sadly, by the time I bought the car, the damage was already done. (Bought it used for under $1000.)
That’s what you get for buying an autobox Subie smh
The clang on the catch teeth on the output shaft must be impressive.
We need more genuinely imaginative people like you.
Haha! Thanks!
Super cool project. Even if it never sees a practical application it is an incredible mental exercise. Keep designing and being creative. Don’t listen to the shit heads without anything useful to contribute.
The second argument is scary. I believe that is why we need sound systems in electric cars that plays an ICE noise. Pretty lame...
Cool video, btw!
Meanwhile CVT has become very popular for tractors in the recent years. From what I have seen, few people miss having gears again once they have tried CVT.
Even ICE cars have added sounds to make the consumer feel like they are driving a fast and powerful car, modern ICE's are very quiet.
That reminds me of the eccentrics of Stevenson valve gear on a steam engine
This is how narrow British steam trains did it. The small tank engines with the cylinders inside the frame did this
There is something about this design that is very familiar. On the second viewing, it came to me. Look up the Stephenson Link valve mechanism, used on steam locomotives since the mid 1800’s. Of course, it isn’t a transmission, but a means of controlling the steam flowing to the two double-acting cylinders that propel the engine. The Stephenson mechanism is relatively simple. Its successors, the Baker, Southern, and Welschaerts valve schemes were progressively more efficient, but more complex. A major drawback to the Stephenson mechanism is that major components were underneath the locomotive, between the driving wheels, making it more difficult to service. The Welschaerts design became the most common because all of the parts were easily accessible on the outside of the loco. There are several video animations of these mechanisms here on UA-cam.
Why it isn't possible to model output shaft as a crankshaft and get rid of ratcheting?
Because the crank has to move the entire way to make a revolution, if it only goes part-way before reversing, the shaft will also reverse.
because crankshafts work with fixed amplitude linear movements and in this case the amplitude changes. is what makes it a variable transmission
I'll watch your time laps in slow motion and know all your secrets! :P
That's one heck of a project - amazing work.
Dang it! Now I have to watch it in slow motion to make sure I didn’t show anything important!
Very impressive
A forth arm woud counter balance to reduce vibration wouldnt it?
8:50 this is what we clicked on the video for
western are Talk To Much
First off ignore the idiots that don't add to your betterment. Second keep thinking outside the box and you will be successful in life. Enough of that, one thing I did notice (not sure if anyone else picked up on it), what about reverse? All the forward motions it would be great but for an automotive application you would still need to back up out of parking spots and so on. I really do think your on to something but just needs a little more thought. Your almost there. Keep at it!
I'm impressed! I definitely could see that in agriculture equipment as well as lawn . Thanks for the vid!
10:34
Is he secretly CrazyRussianHacker?
I used to think trains used a CVT because I could hear the engine revving hard at a single pitch as the train accelerated. Turns out the engine on a train is a diesel generator that runs electric motors on the wheels!
So I guess there is the answer: convert to electricity! Now what to do about the gear ratios of the electric motors.
The motors and generator are a type of CVT.
@Bad Santa The only problem, is the weight and the bulk. No problem for a train locomotive, but would really weigh down a sports car.
I think electric motors have a much wider range in power band. Much less demand for a transmission.
@Blake Belladonna the opel ampera works that way
That kinda how some hybrids work
You mentioned you used fusion. I would recommend learning Onshape.
why?
Also, it looks like the motion of the output shaft is not smooth but oscillates because it is driven by a ratcheting system.
Gear Down For What? Well, I must admit that I know very little about Fusion. I learned SolidWorks and have found Onshape to be the best collaborative, free alternative to SolidWorks. I assume Fusion is more like Blender and less like SolidWorks.
"Well, I must admit that I know very little about Fusion"
A very good reason to keep quiet then!
Fusion is 3D parametric CAD, plus sculpting, high end CAM and a bunch of other stuff.
Where it completely crushes Onshape though, is the ability to work with no internert connection. Whilst Fusion is Cloud enabled, it also caches files locally.
"A very good reason to keep quiet then!" Ouch. Am I being told to "Shut the hell up!"? When is it bad or wrong to encourage someone, especially a student of engineering, to learn a useful and powerful tool? I am not aware of Fusion's abilities to do "3D parametric CAD" like SolidWorks or Onshape. I am aware of the limitations associated with Onshape's requirement to be tethered to the internet. And, like Fusion, it is free for now. But that could all change in the future. FreeCAD and OpenSCAD are both an open source solution that you can rely on remaining available in the future but lack the functionality I have come to expect from products like SolidWorks and Onshape. Finally, I prefer to work in a Linux environment so this is a limitation of both SolidWorks and Fusion. I would really like to say, "to each their own" but the real "problem" with so many options in the sharing of designs. This is one area where Onshape really excels. It is like the github of CAD.
1994? George Constantinesco invented one in ~1920. His used pendulums to automatically vary the torque to the point where he could have a string attached to the throttle of a car and gently pull it along behind him at walking pace! It is really cool and worth a look.
Outdated ratcheting pawls are replaced by peanut shaped cams. In either case they overun, accomplishing 1/2 of your objective.
Love the video, but you could with some more anonymous or quite music (if you need to use music) - Keep up the good work tho!
I think that 3 is the correct number of phases, is like electricity, with 3 phases you theoretically have constant power, nice choise, the phases are 120° from each other right?
Yes
how about adding a counter balance shaft like the inline engine does? or maybe try it out to make a V shape CVT, with another pair of transmission on it and run it on simscale to see it works>( although it's abit impractical as the weight might be too high on this method.)
Would it be impossible to, instead of a ratcheting mechanism, make it a sort of crankshaft? Im also curious how reverse will work with this design.
Everybody talking smack… Even if this goes nowhere you are an awesome thinker and will do big things.
Dude... You're a smart kid. I hope someone who can help you sees it
CONTINUOUSLY 3D PRINTED VARIABLE TRANSMISSION
Man this design vibrates to much. isn't it.
Wow it’s amazing that at 16 you thought and came up with this machine at that age I barely started learning what mechanical engineering was about lol
Zero Tech, it's amazing what the human mind can come up with. Imagine that if everyone who ever had a crazy idea, decided not to try to make it work because it just seemed too crazy, we'd still be waiting for the wheel to be invented, let alone being able to watch this on an electronic device that slips into your pocket. What we take for granted now is the result of countless generations of human ingenuity.
I have an idea to add reverse and back driving capability to this thing, want to find out more? Subscribe, and I'll have a video out as soon as the prototype is done!
EDIT: This project is on the back burner!
it might be interesting to harness the input and output speeds and run them through a another planetary gear system, you can achieve reverse through stop to forward depending on the ratio. As far as I am aware there is no way of preventing overrun.... though there is this very cool idea ua-cam.com/video/JEiSTzK-A2A/v-deo.html
Awesome engineering
Why not scrub the ratchet idea and make the output shaft a crank. I think you'd get a faster rpm. You may lose torque but with the design you have, it seems like energy is wasted from the engine. Cool concept though.
Bring It On.
Your first idea was cool, let's see what else you got.
Please.
Because of 3D printers and UA-cam, people like you are no longer just some guy in a corner with some thoughts,
but now YOU are as an engineer,
bringing wonderful ideas to light.
You know,
just a few short years ago Elon Musk was just some guy making stuff.
Go check out his nonexistent non credentials. You'll be motivated to produce those other ideas that I bet you have.
Once I found a Volkswagen engineer who solved the problem to get a CVT fully rotating without excentric weights. In my opinion the ideal solution. In his example he made a transmission operating on one axle and providing 250 kW each for the front and rear wheels.
Extremely elegant and for sure patented since 15 Years.
However, great contraption man. Because we get other solutions by different people: we will find the ideal way and on the other hand we can avoid violating patents.
The first video I have ever seen that addresses the lack of informed public and silliness of simulated shifting with “modern” CVT’s THANK YOU! Since it is just programming, I thought would be neat to have a mode for those of us who understand and appreciate a CVT.. with all that said.. AWSOME invention, thank you so much for sharing. Liked and subscribed.
That will pulse like hell. I don't mean to say it isn't really cool, but it won't be any good under load over a long period of time. Vibration and heat would cause premature wear. I would think you would want more than 3 phases but you are correct about diminishing returns. Very nice bit on dual differential adder/subtracter drives. It would be really cool to see how this would compare for noise and longevity to an axial piston hydrostatic drive. I would love to see it applied to a small vehicle like a lawn tractor for comparison.
The vibration of this transmission will be very big because of imbalance. Do you have any ideas to counteract vibration?
I think if you balance the weights on the moving arms, it should be fine, because those arms is not moving at the same direction at the same time.
Counterweights just like any crankshaft
Same question here...how to solve the vibration
i think it would have to be made with much more precision then this and every dimension must be calculated with purpose just like a tourbillon watch movement every single gear in the watch is made with crazy precision and without that it would be as accurate or for this subject as efficient or effective
If two of these were pared, it would solve the problem with dynamic balance. because of its three phase design, there is very little static imbalance. It's exactly like balancing an in line six engine.
In answer to 10:35
The only reason this would not be a real CVT is because you can only ratchet a discrete number of pins at a time, so you adjust the cams to not be enough to ratchet: Neutral. More adjusting = 1 pin ratcheted at a time = first gear, 2 pins at a time = 2nd gear etc.... Unless you get a really fine toothed ratchet, but it still would be "digital" to some degree.
I suggested using torington sprag clutches in place of the ratchets for just that reason: infinite resolution.
In 1967 my dad bought a Sears garden tractor. They called it a "hydrostatic" transmission and there was a lever on the side of the tractor and if you pushed it forward the tractor went forward and if you pulled it back no matter how fast it was going you put it in reverse.. and the speed of the gas engine was controlled by a cable that was knob adjustable.
My father said that these type of Transmissions had been used but not in automobiles because they were too inefficient. But the one in the little Sears garden tractor did not seem to be inneficient at the time when a gallon of gas was 23 cents.
I bet it got less than one mile to the gallon. Pumping fluid like that is always very inefficient, but very practical for a lawnmower
Solitaire example was amazing
Great, let's adapt it on a go-cart or a Power Wheels.
Roberto Buenrostro you don't need a transmission with an electric motor. It would serve no purpose.
You will often see a gear reduction system on an electric motor but you wouldn't want to change that reduction once chosen.
You can make an electric motor produce full torque at low RPM as well as high RPM whereas a gas motor only produces its best torque usually at higher RPMs there for a gas motor would need a transmission so that you could get your speed to go both fast and slow all with higher RPMs in a petrol powered machine
Roberto Buenrostro That would be awesome! I just bought a torque converter for our off road go kart project but something like this might be the ticket, especially if reverse could be added!
wow, that was an unexpectedly epic idea.
And watch it blow up lol
Actually, that would be a really cool idea
That´ s a neat mechanism that surely would be interesting for industrial machines.
By the way, Dutch car factory DAF built a fairly widely used CVT known as the Variomatic, which was sold from the early seventies until the late eighties in their Dafodil cars and later on in the Volvo 340. The Variomatic was very reliable and long lasting. A colleague from university owned one that had 360000 kilometers on the clock and went like on day one. Disadvantage was that the transmission made an unpleasantly noisy whining sound and the centrifugal clutch engadeged so badly controllable that the car would normally hop into motion, rather than starting gently. In theory, it could make the car go at its full speed backwards as well. With the Volvo 340, that would be just under 100mph/160Km/h. Unique, slightly weird yet very, very good cars. I owned a manually shifted one for some time. I guess there never was a more useful car on the roads.
Eo Tunun That’s*
It´ s my comment and I plenk if I want to!!1! :op
^^)
Eo Tunun It’s
I hope that didn´t cause you too much trouble?
ua-cam.com/video/063jQAM6N8I/v-deo.html
DAF trucks?
The world's first mechanically propelled vehicle used a form of ratchet drive back in 1770.
but autozone cant make a fortune off of plastic packaged parts when things break
Very nice model. I'm old... so the 1st time I rode in a car with CVT, I thought something was terribly wrong, as in, "something's wrong with your transmission, it won't shift" as we went from a dead stop to 35 on the way to a store. Strange minute or so with my son.
Good design for industrial use.
Do you have a video that just explains how planetary gears work?
No I don't actually
Gear Down For What? Ok because I don't know how they work lol
ua-cam.com/video/5piYEX-jRt4/v-deo.html
ua-cam.com/video/4HPtIXlno3w/v-deo.html
Yeah but this guy explains things in a way that I can understand.
Admiral Percy I
....and we shall never talk about the vibration.
Vibration? What vibration? pfft! it doesn't vibration none!
To vibration:
I vibration;
You vibration...
Edward Scrase I'm not an engineer buuuut, couldn't you replace the ratcheting action with one way clutches? I am fairly well versed in both standard and automatic transmissions.... I'd love to start delving further into this design. It seems fairly brilliant to me
Could stop the vibration if you have two mirrored sets eccentrics to balance out each other.
Travis The one invented in the 30s used one way clutches.
👍LIKED just because you made it and alot have no idea anyway ive never seen this b4 so but like the video 📱👨💻
Fendt has them in there tractors since the 90s. Awesome transmission
Very clever. If you put a ratcheting clutch together with a flywheel on the output shaft, it will smooth out the pulse on the output. Just like a capacitor in an electrical circuit or an accumulator in a hydraulic circuit.
...because the Aspen tree has round stems at the base of each leaf, and the Cottonwood has flat stems. now they both grow in the same... Eagle Scout, go figure...
Was this post written by an AI?
CVT stands for continuously variable transmission, not consistently as you stated
He says 'continuously' at 0:19
Means the same thing
Kllrbny At 2:49 he wrote out "CVT=consistently variable transmission" just pointing it out since this is supposed to educate people, not confuse. V3MD, it most definitely isn't the same thing. If you look at any literature on these devices, they never call them consistently variable transmissions. It just doesn't make any sense. Continuously in this context means that you can have vary the gear ratio in very fine steps, vs the four or 6 discreet gears in a traditional transmission
Consistent =/= constant. As mentioned, these are CONSTANTLY variable transmissions because the ratio is always changing. A consistently variable transmission would change in a repeatable manner, but NOT necessarily constantly.
Ben Upde Well, with my skill in English, I could describe a regular gearbox as "consistently changing", as it's using consistent gear ratios instead of variable ones. So yes - using the word "consistent" instead of "continous" implies the opposite to what it's supposed to.
The mechanical version of a 3-phase voltage, in a way
There's something to that. I wonder if it would scale in 3s as well
*Power / Current flow to be precise.
FANTASTIC, GOOD WORK! More than 65 years ago I got my first introduction to a variable eccentric transmission. It was in my mom's old Maytag wash machine and varied the amount of agitation. When the worn-out machine was discarded behind the shed, I took the transmission apart to see how it worked. That idea has dominated much of my thinking ever since. As others have pointed out though, your model has some shortcomings. First, the ripple in the output makes it worthless as an automobile transmission. You could get rid of some of that by adding more cams and by replacing the output ratchets with over-running clutches. The other thing that limits its application in an automobile is the inability to backdrive. There are other uses for your idea though and I hope you are moving forward with your education and your understanding of how things work. A bright future is ahead of you.
dude, you were 16 n designed n built a cvt that you hadn't seen before n all engineering history was only patented 14 yrs before? … that's still pretty impressive .
I'm going to take a guess that the ratcheting mechanisms on the output shaft keep it from being continuously variable, but I'll stay tuned for the next video to see why.
Heh your onto something
Yes, it's not continuously variable because it relies on discrete steps in the ratcheting mechanism. A rotation equivalent to say 1.2 cogs will not get picked up by any other ratchet, which means while it may rotate by that angle it cannot transfer torque until the next ratchet comes along 0.2 cogs later. This aliasing effect means it's not continuous but rather has enough discrete steps to give the illusion of being continuous. It's sort of like a circle on your computer screen; it's actually squares arranged to look like a circle, but since the pixels are so small your brain smoothes out the edges and what you see looks like a perfect circle. You could increase the number of transmission steps by making a shaft with a smaller cog modulus or by adding more phases. Both would reduce the aliasing effect. I guess if you put a large wheel on the output shaft this effect would be very visible.
English isn't my native language so I hope I got those engineering terms right ;)
Haha spot on dude, great explanation!
the ratcheting design would need to go into a computerized idea as an electrical set input and output
yes a certain amount of lost motion due to ratchets kinda will mean this wont be in a car !