The Coolest Transmission You've Never Heard Of... The Ratcheting CVT
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- Опубліковано 4 бер 2018
- 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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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.
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 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.
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?
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!
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.
What university do I have to enroll to be in your class professor?
Hey! I made a T-shirt with a cad drawing of the Ratcheting CVT on it! You can order one through amazon for 19.99! Your choice of color and size!
www.amazon.com/dp/B07CWYYPQ6/ref=cm_sw_r_cp_api_i_YJo9AbCGVGMBR
So when the cams are aligned the output is producing the most torque but spinning at a slower rate?
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.
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.
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
Cars with a gear lever that have... no gears? I'm in.
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.
Would you like to own one of these?
For the next 10 days you will have a chance to purchase one on eBay!
www.ebay.com/itm/like/302794206232?rmvSB=true
It is impressive that you invented a type of transmission that no one else had come up with until 1994. An awful lot of smart people had had a crack at it by then. I remember inventing the turbo charger when I was about 12. While disappointing, it was nice to see that with a few glaringly obvious improvements, my idea would have worked.
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
Everybody talking smack… Even if this goes nowhere you are an awesome thinker and will do big things.
Its nice to see that not only me came up with ideas when I was young and when I grew up I found them exsisting..
Holy hell, dude. Love your obsession , thanks for sharing
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?
....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.
Dude. Minds like yours are the ones that change the world for the better. You are absolutely amazing
i'm always humbled by a lot of you tube vids and this is one of those
i don't understand anything that's being said, but i like the thing, so i don't care.
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.
I was clueless up to the demo. Looks like a nice invention. Fascinating to watch in any case.
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
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.
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.
Fooken BRILLIANT MATE, keep up the good work! Went to subscribe and realised I already have some years down the road. Good to find you again, shared this to my FB. Bravo!
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
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...
That's really clever, and I do believe you came up with the idea yourself. I too thought I invented many things before finding out it already existed but yours is way more awesome, great job!
I have no idea why im watching this. Which is quite the compliment of your presentation skills.
Impressive stuff dude, keep it up
Spanky?
Well first you should print a cover for your outlets on that back wall.
Gear up dude^^
awesome vid , subbed
I originally saw this awhile ago, and it is amazing!!! I have come back again to show my stepdad this. Also, i learned that my john deere lawn tractor i am buying from a neighbor has a hydrostatic transmission, which is basically a CVT!! This is an excellent work of art, and engineering!! Excellent job!!!
Lots of tractors and construction equipment use continuously variable pumps (variable volume pumps) to drive hydraulic motors.
@@GordieGii that's awesome!!!
I'm impressed! I definitely could see that in agriculture equipment as well as lawn . Thanks for the vid!
A ratchet mechanism is an absolutly nogo for serious applications
ZwurlTech why's that?
The most important factors in a serious application are efficiency, reliability and durability. And whenever a rotating motion is transformed into a reciprocating, and than re-converted in a rotary motion, you will run into a massive efficiency problem. In addition, the ratchet-mechanism generates pulsating torque, which means a very critical load situation for the entire drive train. In order to transfer a high torque, the parts of the mechanism must be strongly dimensioned, with strong springs. But strong parts are heavy, and that leads to big problems at high speeds. And they produce a tremendous noise
The spring-loaded parts of the mechanism generate a high degree of friction heat while moving back, this leads also to a massive efficiency issue. The point, where the edge engages the groove is extremely susceptible to wear. And so on...
For these reasons, I think, your mechanism ist well suited for some control-applications, but never useful vor a serious gear train.
ZwurlTech Yeah, that part of video sounded dumb to me.
Also, the more areas of contact means more wear, I'd rather change 50 belts than a whole ratchet assembly because the teeth started to be ground away
I second that. There's one thing you're not talking about : effeciency . This will be horrible in this system.
We need that Transmission in every ones car, it breaks during the demonstration. I'm a mechanic, I will make a fortune fixing that.
hahahaha
Lol
NO you are just a wannabe. Thats all... Sad
At least you're an honest one.
@Corey Same here, plus mine was not 3d printed..
Wow a lot of people thought of this idea but decided just to comment...
You are the only one that took the time to make a video. Keep up the good work man!!!
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.
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
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?
Awesome. "if you're not making mistakes you're not trying hard enough" Keep it up
The world needs more people like you
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 :)
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.
That’s cool. Didn’t understand what was going on until I watched the output shaft. Very innovative thinking
Dude, that is brilliant. You are awesome.
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.
Was it an impostor because of the ratchets and their own inherent inefficiency or rather their output rotary motion not being smooth?
I don’t understand a single thing you say, but everything you make is awesome
One way bearings instead of the ratcheting mechanism would be cool (Just an Idea). This is an amazing Idea and appreciate people like you on this world who are able to picture these complex mechanisms and make them a reality. I cant wait to see more of what you have to offer. Happy holidays!
I think the Prius Cvt is one of the most simple and robust versions. Basically and open diff with the electric motor varying the speed. Its one speed but infinitely variable. The electric motor helps down low and when the engine needs to idle at stop all the rotation is sent though the gererator side letting the wheels sit still. Kinda like when you hold one wheel on a open diff and all the power goes to the other side. Its so bullet proof idk why its not used more. No clutches or bands to wear and much less heat. But it needs a electric motor which generally are very reliable and you have the extra complexity of a battery and inverter to power it all.
It has limited power capacity.
I have to agree about the prius cvt. Outstanding design, and I dought its power limited like friction cvts just up the size of the motor and gearing. I bitch nonstop about friction cvt s and curse the auto manufacturers for using such failure prone garbage...honestly does anyone have a NON PRIUS cvt with 300,000 trouble free miles?
@wrangliser But much less limited than belt-type CVT's, and much less complex.
I love my Prius, at first it was so weird to drive but now I can really respect the design. CVT's will advance in design as consumers are drawn to their fuel economy. I wonder if Toyota made the design so tough or if there is an un-thanked inventor somewhere?
Tim Z. I don't think you have any idea what you are saying. Keep learning though. Maybe you will get it.
Wow amazing work. That adjustment mechanism is brilliant.
It's always difficult to express an idea and represent it in the real world, but I totally get the point here. Keep up with the great thoughts
Awesome work! A man after my own heart when it comes to garage invention. I love it!!!
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!
Nice. Thank you for sharing. This is awesome work. And now I know how a cvt works.
This is awesome, I was thinking on something like that years ago when the electric skateboards started, but I never figured out a way
Amazing,this guy should be working in NASA
That is exactly what I build out of Lego at my YT channel ;).... Completely fan of CVT's ! Yours is Great !
CVTs suck, they make you car sound like crap. What sounds better, rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr or rrrrrraaaaaaAAAAAAAHHHHHHHHHHCAHAAAAAAAAAHHHHHHHHHHHCAHAAAAAAAAAAHHHHHHHHHH
Hey dude :D
[]HĒŁŁ [] KNĪGHT [] Hellooo ! Fellow faithfull subscriber ^^
Lego Technic Mastery I’m subbed to u
Garin Bahr Wow, Thank you very much, Generous supporter ^^
Dear Sir,
Regardless of the fact that you might have been beaten to it regarding variable transmission, your ingenious device deserves some recognition & surely could potentially be applied in some field(s). You clearly have studied various means & been burning the midnight oil to come up with this which by all accounts is highly original not to mention highly effective. Very well done. Kind regards.
I marvel at this beautiful engineering job. It's outside my brain's capacity to go.
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.
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
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 know how you feel, when I was 17 I thought I had come up with a workable system for a camless four-stroke using moog valves.... 18 years later I'm just a bum who knows how to fix cars... oh well... I love this thing. Totally impractical, with no workable real world applications that I can think of and yet stunningly impressive! Love your channel, even you you make me like a moron sometimes...
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
8:50 this is what we clicked on the video for
western are Talk To Much
I had a 2012 Mitsubishi Outlander with a CVT. It was magical to accelerate and see the RPM remain the same. It had an alternate mode that simulated a six speed manual shifter, but that always felt inferior to the full auto infinite GR. Also, it had a 100,000 mile powertrain warranty that remained in effect as long as the maintenance schedule was followed. I loved that thing. I got better than 30MPG, partly because I drove conservatively, but it also had surprising power when called for. 0-60 in about 6.5 seconds was the best I was able to do on dry, level pavement. I think it had a 168hp 2.4l V4.
This is great, just what I need to run pottery wheel, lathe, spinning welding/plasma table for cutting and welding perfect circles
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.
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.
I had a similar experience when I was in high school and thought I had invented a downward locking milling machine vise only to find Kurt Workholding Corp. had done the same thing in in 1946, fourteen years before I was born. The drive you came up with has been built for many years by Zero-Max Corp. in Plymouth, Minnesota. I think they are still in business. The first one I ever saw was used to adjust speed on the power feed of a drum sander. I also saw one that was pretty much the same thing and used to feed the carriage on a 56" circular sawmill. The sawmill was built by Frick Co. of Waynesboro, Pennsylvania but the variable speed set up was an after market attachment with no name on it. It was pretty ancient however...the eccentrics and ratchets were all exposed. I would guess it was made before 1920. Like yours, the input in these transmissions could be in either direction but the output was fixed in one direction only. Very ingenious and don't feel bad someone beat you to it first. Throughout history there have been countless examples of things being invented simultaneously without one inventor having a knowledge of the other....calculus, telegraphy and the lightbulb to name only a few. If you didn't know about it, it doesn't make you any less clever than the first guy. Nice work and keep it up.
Oh wow! I also invented a version of this years back. However I never had any sufficient stuff to test the concept. Somehow it feels weirdly comforting to know that world wasn't missing out on this tech after all, it just didn't hold up irl.
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
That reminds me of the eccentrics of Stevenson valve gear on a steam engine
Took me awhile, but I finally get how this works. That is soooo cool!! :D
I really like your idea, I will try to print and understand it, thank you for sharing
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.
I also have two inventions in mind that I am sure are solid. But I am discouraged to try to get anything patented etc.
MAN loved your work i'm also a mechanical engineer having diploma and i'm too inspired from your invention you are an idol for people like me how are trying to figure new things and trying to develop them even with lots of criticism . Just develop things like this and inspire us . All the best for future
Awesome build I like the concept!
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.
I might make a metal Verison and put it on a go kart or something small idk maybe seems cool
Jokey Jesus it seems it might be a differential, rather than CVT
Yeah that would be an awesome idea
Whoa!!! This and YOU are very cool. Engineering-minded Physician love your design, and wish you much success. Rare that a you-tuber loses me in the first view!
We need more genuinely imaginative people like you.
Haha! Thanks!
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
I'm curious what your elevator pitch would be for this thing
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.
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.
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 !
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 can think of ways to use this technique when a low RPM is required. Nice work!
Great concept just loved this system basic working.