Hi We used to use these back in the 70s before inverter motor controllers were available they were called kopp variators the tool I used the most was a marine cylinder hone with a 3kW motor there were 7 50mm steel balls in the variator. In some respects I might still prefer to use one of these over an inverter as some motor-inverter combinations can be noisy Always love your excited enthusiasm Keep up the good work
That is a great design! There is a very similar type of CVT in common use on petrol-powered snow throwers. The engine drives a steel disk upon which a rubber-tired ring is pressed at 90 degrees. By sliding the ring close to the outer edge of the disk or toward the center of the disk it changes the ratio of input/output RPM. It's very robust and fairly efficient from the perspective of power lost to friction.
Laboratory overhead stirrers from IKA use a very similar system. The motor has a steel cone with a shallow dish, the motor sits on a rail allowing it to move in and out relative to the hard rubber contact ring and thus vary the speed
Hi, I like the principle of this design in getting a variable transmission. But I think there may have been a mistake with the motion of the intermediate balls that change the gear ratio in your model. The levers moved in different directions because they were attached to the parallelogram of the change mechanism (one lever moved towards the input shaft and the other away). This however is wrong, both levers should move in the same relative direction - either towards the input shaft or away from it. This would mean that the balls maintain the Sam relative angle to each of the rings and thus the same gearing.
That's what I was thinking too. To mirror the rotation, the parallelogram could be a figure 8 over two levels, or just a Z as a single bar would be strong enough in this situation.
@@VeniceInventors Or it could be a simple push/pull yoke attached to the ball axle. An especially useful configuration if you want to use a fly-ball regulator to control the output speed. Attach the yoke to a sleeve around the output axle, connect the regulator so that it pulls the sleeve towards the discs as the output accelerates.
I just wanted to say that I enjoy your videos so much. I can’t stop smiling during your entire presentation because of the joy I receive in the information you provide. Thank you and please continue creating your wonderful videos.
Thank you for the video, Robert! Initially I was thinking that such a mechanism would require a ball on an axel that moves in and out of the center of a spinning disc, perpendicular to it. But this does seem more practically useful! Thanks again!
Excellent project. It would also have many uses in a waterwheel system. For instance, if you had a waterwheel powering a trip hammer, you could use it to control the duration between the hammer strokes.
@@ThinkingandTinkering With a slight modification (to allow the balls to be moved out of contact with the rings), you could even use it to stop the hammer altogether.
traditionally they would change (dwell) duration between strikes by selecting different numbers of trip cams on the driveshaft. "Ancient power-hammers and the city that put steel in the world" by Lindybeige.
I saw a bicycle transmission like this. The axis of the planetary balls was aligned with the axis of the drive and driven wheels so that the same effect could be achieved without reversing the rotation of power input compared to the output.
You forgot to show it pulled toward you showing the speedup of the structure. Now I'm going to have to build it to be able to see that. This is a fabulous DIY energy adjustment device and can be made with other rubber parts also. This design is excellent for a hydro unit to adjust the speed as the water flow changes by the hour as it rains and then gets dry out again. It can be set to precisely keep speed at the mains frequency or a fixed voltage for a solar charger inverter.
Just the sort of thing I've been looking for! Not exactly as shown, mind you, but if you mirror the mechanism into two transmissions with a central driving wheel, and have their transmission levers on one bar, you'll have two outgoing wheels with a fixed sum of transmissions, which is necessary if you've got a box-trike that needs to be able to turn tight corners...
Remember the idea i said earlier for the galaxy drive and the gravity battery with the fan blades that can seal. I was thinking that we could fill the tube for the gravity battery with water, and have a series of blades that wil open and turn as the weight drops, but as you put energy back into the system, it closes the fan blades automatically and also draws the water up, as added weight. Im thinking this might be useful for an under a pond or lake or under the ocean type application? Perhaps reverse it maybe, so that theres a vacume under the fanblade seal that causes a vacume as the weight is pulled back out of the hole while sealed off...
Great😊😊😊RESPEKT😊😊😊zašto se takav mjenjač u automobilima i u drugim strojevima ne korist ? ..,..tebi: Puno poštovanje gospodine, i hvala ti zato što otvoreno govoriš o tim jednostavnim rješenjima, i volim da te inžinjeri raznih struka više poslušaju i poštuju tvoj rad GREAT.
Yep - torotrack... maintaining contact pressure is key (to inefficiency too_ +/- 90 degrees for infinite +/- rotational conversion (don't ask about efficiency at the extremes)- mononum of 3 balls is logical (3 is "self orienting in plane" allowing cv joints to be used on the disks - freely orienting...).
@RobertMurraySmith Shouldn't the two balls have had their axes turned in opposite directions? Turning them in the same direction, the rings have opposite ratios on each ball, i.e: 1:3 on one side 3:1 on the other. You need to turn them the same angle towards the same ring, don't you?
You could redo the parallelograms long sides as sliding crossbars that have a slot to pass through each other along the sides to fix this. then each end turns the same angle towards the same axle.
The defeciencies of this transmision is the ratio controlled manually, i got an idea to monitor the motor current with sense resistor feed to microcintroller using opamp. The microcontroller control a small servo motor to control the ratio through the lever. The decision using microcontroller is that the ratio could be altered to be non linear using non linear function or to speed up the algorithm by using lookup table. The microcontroller i choose is esp-12f for the price. By the way for the wind collector, i think it is better and easier to use the blade like in boat impeller reversed stacked in upward spiral. It will direct the air straight upward for higher speed and to catch air current that slips away. I also planned to paint it black doff to heat up the air inside the "chamber" so that it generate slightly more speed on hotter days using air convection. Will this works? It is only as per my understanding, i only formally learn chemistry, finance and economics studies.😅
...or you could use a simple mechanical centrifugal regulator (a-la steam engine) to control the ball angle and ratio. This avoids the fun of programming your microproceser of course, so probably defeats the object of your exercise!
Are u planning on making a feedback loop for the constant secondary "gear" speed? If so are u gonna use arduino or a raspberry or will u make your own feedback driver? I would love to see it this could dramically lower the cost of diy wind turbines since u can use a asyncronous motor as a generator straight on the grid
I've been wanting to build such a thing for 2 bicycle wheels to explore the rotational inertia of counterrotating flywheels and what happens to the precessional forces. One theory is that the opposite vectors would simply cancel out. I'm thinking that the axle bending forces of the counteracting precessions would be detected.
They would cancel out as a whole but definitely still have local force imbalances. Granted it is easier to control but it still doesn't disappear in the system. Mechanical energy transfer happens fast but not instantly and that creates a problematic imbalance itself at high RPMs for any object. Like anything naively manufactured spinning at 10k RPM gets problematic in that.
@KaiserTom Yes, yes, the tendency to precess, as a whole, would disappear. But assuming that both were counterrotating about the Z axis, I'm not convinced that the moment of inertia about X, or Y, would remain unaffected. The differences between the static moment of rotational inertia about X, and the spinning moment about X is what I've been wondering about. I does not make sense that it would be the same, although the simplistic math would say that it might. The bending force on the axle, of both gyros trying to precess in opposite directions should have some equal reaction resistant to that motion.
Maybe a very fool question (according to what we know about "gears and transmission") but does it feel harder / easier to spin it when You change the ratio of in / output?
Some sort of centrifugal lever on the input side that pushes and pulls that lever to maintain a more stable input RPM while automatically increasing the output RPM would be interesting.
Um , the wind very seldom holds a steady speed , that would be your power source . But he said the speed is variable at the output end too . That’s puzzling to me . How do you handle torq ? In the C V T s I’ve seen , there is a belt that handles the torq , but the friction is what destroys the belt . In a car transmission , they are metal . In old toys with gas engines they are rubber mixed with Kevlar . But on a wind turbine ? Talk about a maintenance problem ! There has to be a better way .
Theoretically it's single point contact which means it's unable to transmit much more than a hand crank force,. Reality is, it's not single point, resulting in friction and wear.
I had an idea for a breaking system, Copper and neodium magnets and a mechanism that puts them cloer as it speeds up. Aft watching a heavy neodium magnet stop dead when swung at a copper plate last night gave me these idea so far. If u can fin it its worth watching. Also u could maybe get eough power fome the minut heat that could be used as well possibly. Just still picturing it in my head xx
Already in production and used for roller coasters, maglev trains and land-speed-record test vehicles. Switch the copper discs/plates for copper coils, and you've got the regenerative brakes used in hybrid and electric vehicles.
The balls are being angled incorrectly, the axis of rotation of the planetary gears needs to always point towards the same direction, not apposing directions
This delight to see, Like a Christmas present in a tinker shop under an intelligence tree. The Santa Claus competition is ON! lol Gnomo Paws vs Santa Claus! I wish I could go on a shopping spree!
I don't think you know what the word "simpler" means. Neither "less" ("The mechanism consists of a spring-loaded stack of thin disks on a central shaft. Around this are arranged other stacked disk packs on a number of planetary shafts, usually three. These shafts are mounted on swinging arms, so that they may be moved in and out together. The Beier gear rely on on viscous drag through a thin oil film between them.")
This type of CVT is used in the Enviolo step-less bicycle gear shift. I have one on my ebike, and it's so convenient to adjust my gear ratio on the fly to my liking while applying constant torque to the pedals.
This is a great design and it's awesome you released the file for everybody, but my favorite part is just the joy it brings you using it. It's infectious.
In following all your 3D printed projects you seem to have inspired a lot of people to learn to use a CAD program. I think that is wonderful. Hats off to you Rob! CAD drawing is such a useful and satisfying skill to have
this style of transmission is used in millions of bicycles, an special oil is used which locally solidifies from the pressure so that there is no contact of the metal parts (preventing wear)
I don't think I will EVER be able to stop watching your videos. Even though I think I have a reasonably good understanding of physics and engineering I'm continuously learning something new from you - as well as being entertained! Thanks as ever, Rob - please keep doing what you're doing! 🙂
I believe that the more balls you add the more friction will be generated, if you were using it for something (bicycle or a wind turbine as suggested) with a limited power output you would lose a great deal of the input energy. It’d also become really complex to control all of the balls unless they’re simply idlers - ie ones to hold the plates at a consistent distance. It’s a very interesting idea and the most dead simple CVT I’ve seen, to scale it up you’d want really solid metal circular plates for the input and output that won’t flex and solid bearing blocks and yokes to further minimize losses. While fascinating, I don’t think this is something that could really be used in a real world application but it’s definitely a cool concept.
@@sjsomething4936 Anything you add will increase friction. That is beside the point. I would have no problem cycling it with a dozen drive balls on it, but it would slip with only 2 of them because the power to traction/friction ratio would be too small. Just like adding fatter tires to a race car add rolling resistance, but without them, the car would just sit in one place and burn the tires off. All mechanisms have tradeoffs. Also, one need not have an actual whole sphere on these, a hemispherical roller would save on total machine mass, while also allowing the tilting mechanism to be closer to the center of both axis of said hemispherical roller at the same time [which offers some real advantages relating to strength of the mechanism and total mass and volume of the whole transmission]. To hold the plate at a fixed distance can be performed with some external thrust bearings, so that would not be such a big deal, and, depending on how much power one was applying to said device, might prove critical to keeping it rigidly in place under a load. So far as making the main wheels [either partially, or entirely] out of metal, that would be fine, but if you want strength without a lot of mass, setting up a hardened steel set of races on the outside with something like magnesium or composite material for the most of the drive plates would make more sense than a heavy steel one. I could see making something that safely conveys more than 50 BHP that weighs less than 10 Kg and takes up less than 1/10 of a cubic meter in volume. Compare that to most 'infinitely variable' transmissions, and that is rather light. I have an infinitely variable hydraulic transmission which is rated for 50 BHP and while it is about 1/10 of a cubic meter in volume, it weighs about 35 Kg, as it is made mostly from cast iron, machined steel, and some machined brass parts.
I think the parallelogram isn't the right movement, the control rod needs to cross the centre point, so the the inner axis' of the balls point in the same direction, not opposite, the two ball posts should turn in opposite rotations, i.e. one clockwise, the other anti-clockwise. Is there a way I can send you a drawing to explain better?
it doesn't seem to matter - i tried it both ways and it made no difference so I went for the easiest mechanism - where the ball touches the ring might change that but for what i did - it seems ether is good - and the control rod does cross the centre of rotation that's why the offset cage
@@ThinkingandTinkeringOne of the balls is generating friction then, and you'll probably only get the slower output due to the greater torque vs friction of the ball that is angled away from the output, if they have crossed members you could get the output to spin faster than the input too, though likely with a little more elbow work.
There seems to be one problem with the model, rather than using a parallelogram you'd want to be using something that would shift the shafts of the balls all towards one wheel. It gets noticeably louder when you turn the handle, likely due to one of the balls having more friction on it than the other one.
@@ThinkingandTinkering With a single ball the mechanism works as you've described. But with the parallelogram one of the balls has the small radius on the red wheel and the other has the large radius on the red wheel. When in reality for a reduction you'd want both small radii on the red wheel and both large radii on the blue wheel. It becomes more apparent as you add balls around the circumference of the wheels.
Ooh! Nice. Amazing demonstraion of a simple principle that's certainly in the "i'd never have thought of that" category. But wait a sec... Shouldn't the two balls be rotating _antiparallel?_ I mean, when one ball's axis of rotation is tilted towards the red wheel, say, the other ball's axis should also be tilted _towards_ the red wheel, yes? Not _away_ from it?
it doesn't seem to matter - i tried it both ways and it made no difference so I went for the easiest mechanism - where the ball touches the ring might change that but for what i did - it seems ether is good
Hmmm, my first attempt would have been to have kept both slower or both faster rotations of the small transfer balls to the same disc. First glance tells me that one ball slips , I wonder why... interesting, And weird. Guess I'll have a think about it later after I've had coffee.
One ball does slip because the parallel bars should have been crossing bars. As it is built one ball is fighting the other when not centered. I think that is why we were not shown the driven disc spinning faster than the drive disc. On this channel a video per day is a priority over accurate useful information, but it does keep guys like us thinking.
It looks like crab steering not Chinese puzzle as I would expect, the bar on the top should be a cross linkage not straight. Top down view would make it clearer.
it doesn't seem to matter - i tried it both ways and it made no difference so I went for the easiest mechanism - where the ball touches the ring might change that but for what i did - it seems ether is good
![[TH] FS vs BME - VCT Ascension Pacific - Lower Bracket Final](http://i.ytimg.com/vi/wnygqsR2Fig/mqdefault.jpg)
Hi
We used to use these back in the 70s before inverter motor controllers were available they were called kopp variators the tool I used the most was a marine cylinder hone with a 3kW motor there were 7 50mm steel balls in the variator.
In some respects I might still prefer to use one of these over an inverter as some motor-inverter combinations can be noisy
Always love your excited enthusiasm
Keep up the good work
I enjoy watching you enjoy these inventions almost as much as the inventions themselves. Thanks as always.
That is a great design! There is a very similar type of CVT in common use on petrol-powered snow throwers. The engine drives a steel disk upon which a rubber-tired ring is pressed at 90 degrees. By sliding the ring close to the outer edge of the disk or toward the center of the disk it changes the ratio of input/output RPM. It's very robust and fairly efficient from the perspective of power lost to friction.
I have an old (like 70's or so) lawnmore that used the same design. An idler 'tire' lol
Laboratory overhead stirrers from IKA use a very similar system. The motor has a steel cone with a shallow dish, the motor sits on a rail allowing it to move in and out relative to the hard rubber contact ring and thus vary the speed
Hi, I like the principle of this design in getting a variable transmission. But I think there may have been a mistake with the motion of the intermediate balls that change the gear ratio in your model. The levers moved in different directions because they were attached to the parallelogram of the change mechanism (one lever moved towards the input shaft and the other away). This however is wrong, both levers should move in the same relative direction - either towards the input shaft or away from it. This would mean that the balls maintain the Sam relative angle to each of the rings and thus the same gearing.
That's what I was thinking too. To mirror the rotation, the parallelogram could be a figure 8 over two levels, or just a Z as a single bar would be strong enough in this situation.
@@VeniceInventors Or it could be a simple push/pull yoke attached to the ball axle. An especially useful configuration if you want to use a fly-ball regulator to control the output speed.
Attach the yoke to a sleeve around the output axle, connect the regulator so that it pulls the sleeve towards the discs as the output accelerates.
I actually commented the same, because I was surprised no one else caught it, then I post and see this.
I came into the comments to say exactly the same thing.
I noticed the same. That is why the balls were squeaking, the intermediate balls were working at opposition.
I just wanted to say that I enjoy your videos so much. I can’t stop smiling during your entire presentation because of the joy I receive in the information you provide. Thank you and please continue creating your wonderful videos.
Thank you for the video, Robert! Initially I was thinking that such a mechanism would require a ball on an axel that moves in and out of the center of a spinning disc, perpendicular to it. But this does seem more practically useful! Thanks again!
It could be that both methods could both be combined together for a higher level of control!
Glad it helped
Take something simple, make something complicated and crazy and absolutely wonderful out of it.
You’re a genius and an entertainer man!
Never seen this mechanism before. That is brilliant, such an elegant solution.
Excellent project. It would also have many uses in a waterwheel system. For instance, if you had a waterwheel powering a trip hammer, you could use it to control the duration between the hammer strokes.
oh - that's clever - nice one mate
@@ThinkingandTinkering With a slight modification (to allow the balls to be moved out of contact with the rings), you could even use it to stop the hammer altogether.
This is similar to the transmission in a snow blower.
@@rayg436 Is it used to control the speed of the snowblower?
traditionally they would change (dwell) duration between strikes by selecting different numbers of trip cams on the driveshaft. "Ancient power-hammers and the city that put steel in the world" by Lindybeige.
Thanks for the knowledge and joy from the satisfaction of the functionality. Unity in knowledge ✌🏼
love to see this channel hit a million subs
lol - that would be cool!
I saw a bicycle transmission like this. The axis of the planetary balls was aligned with the axis of the drive and driven wheels so that the same effect could be achieved without reversing the rotation of power input compared to the output.
You forgot to show it pulled toward you showing the speedup of the structure.
Now I'm going to have to build it to be able to see that. This is a fabulous DIY energy adjustment device and can be made with other rubber parts also.
This design is excellent for a hydro unit to adjust the speed as the water flow changes by the hour as it rains and then gets dry out again.
It can be set to precisely keep speed at the mains frequency or a fixed voltage for a solar charger inverter.
Wow! That's awesome Rob. Keep up the flow of knowledge. You are truly appreciated.
RM-S and a 3D printer, a match made in heaven I think.
You have an awesome way of explaining things. Always love watching your stuff from Oklahoma!
Awesome! Thank you!
You make cool and inspiring video's thank you!
Glad you like them!
really wonderful design rob
Fantastic! Thank you and your furry friend for such an elegant concept!
Just the sort of thing I've been looking for! Not exactly as shown, mind you, but if you mirror the mechanism into two transmissions with a central driving wheel, and have their transmission levers on one bar, you'll have two outgoing wheels with a fixed sum of transmissions, which is necessary if you've got a box-trike that needs to be able to turn tight corners...
This is done with a different mechanism in piston airplanes where the propeller speed remains constant while the power can vary.
Ne znam koju si škoku završio?,🤣🤣🤣🤣🤣ali puno sam za nekoliko godina od tebe naučio i radujem se tvom novom videu, Great.
Excellent video…can you tell us what the min and max speed ratios are vs the angle of the control mechanism
Remember the idea i said earlier for the galaxy drive and the gravity battery with the fan blades that can seal. I was thinking that we could fill the tube for the gravity battery with water, and have a series of blades that wil open and turn as the weight drops, but as you put energy back into the system, it closes the fan blades automatically and also draws the water up, as added weight. Im thinking this might be useful for an under a pond or lake or under the ocean type application? Perhaps reverse it maybe, so that theres a vacume under the fanblade seal that causes a vacume as the weight is pulled back out of the hole while sealed off...
You are a genius Rob
Simply BRILLIANT !!!!!
Cmon you're doing the cVT now. Don't tell us fibs Rob, you're just trying to 3d print a twizy, aren't you... lololol. Great work mate!
Great😊😊😊RESPEKT😊😊😊zašto se takav mjenjač u automobilima i u drugim strojevima ne korist ? ..,..tebi:
Puno poštovanje gospodine, i hvala ti zato što otvoreno govoriš o tim jednostavnim rješenjima, i volim da te inžinjeri raznih struka više poslušaju i poštuju tvoj rad GREAT.
Love this ... But is there a way that this or your other variable transmission can adjust based on the rotation speed of, say your wind turbine?
I was pondering a governor mate
Nissan used to have these types of CVTs attached to their V6 powerplants.
Dog is like, that scientist is playing with my toys.
Yep - torotrack...
maintaining contact pressure is key (to inefficiency too_ +/- 90 degrees for infinite +/- rotational conversion (don't ask about efficiency at the extremes)- mononum of 3 balls is logical (3 is "self orienting in plane" allowing cv joints to be used on the disks - freely orienting...).
@RobertMurraySmith Shouldn't the two balls have had their axes turned in opposite directions? Turning them in the same direction, the rings have opposite ratios on each ball, i.e: 1:3 on one side 3:1 on the other. You need to turn them the same angle towards the same ring, don't you?
You could redo the parallelograms long sides as sliding crossbars that have a slot to pass through each other along the sides to fix this. then each end turns the same angle towards the same axle.
I love it!!!!! Thanks Rob. /Mikael
Lijepi pozdrav i respekt iz Croatia, imam patent za vjetroturbine i ovaj dio je luda stvar, ako ju upotrijebim. 😍😍😍😍😍hvala ti, i volim vjetroturbine!
The defeciencies of this transmision is the ratio controlled manually, i got an idea to monitor the motor current with sense resistor feed to microcintroller using opamp. The microcontroller control a small servo motor to control the ratio through the lever.
The decision using microcontroller is that the ratio could be altered to be non linear using non linear function or to speed up the algorithm by using lookup table. The microcontroller i choose is esp-12f for the price.
By the way for the wind collector, i think it is better and easier to use the blade like in boat impeller reversed stacked in upward spiral. It will direct the air straight upward for higher speed and to catch air current that slips away. I also planned to paint it black doff to heat up the air inside the "chamber" so that it generate slightly more speed on hotter days using air convection. Will this works? It is only as per my understanding, i only formally learn chemistry, finance and economics studies.😅
...or you could use a simple mechanical centrifugal regulator (a-la steam engine) to control the ball angle and ratio. This avoids the fun of programming your microproceser of course, so probably defeats the object of your exercise!
Amazing. Such a clever idea.
You sir, are a genius, and I really enjoyed this video. Thank you so much.
Glad you enjoyed it!
Great video Robert. New topic - AEROmine wind turbine - ever seen this set up? Based in Texas
Are u planning on making a feedback loop for the constant secondary "gear" speed?
If so are u gonna use arduino or a raspberry or will u make your own feedback driver?
I would love to see it this could dramically lower the cost of diy wind turbines since u can use a asyncronous motor as a generator straight on the grid
You could do this with an old school ball governor. Give it a Google. Quite ingenuous.
I've been wanting to build such a thing for 2 bicycle wheels to explore the rotational inertia of counterrotating flywheels and what happens to the precessional forces. One theory is that the opposite vectors would simply cancel out. I'm thinking that the axle bending forces of the counteracting precessions would be detected.
They would cancel out as a whole but definitely still have local force imbalances. Granted it is easier to control but it still doesn't disappear in the system. Mechanical energy transfer happens fast but not instantly and that creates a problematic imbalance itself at high RPMs for any object. Like anything naively manufactured spinning at 10k RPM gets problematic in that.
@KaiserTom
Yes, yes, the tendency to precess, as a whole, would disappear. But assuming that both were counterrotating about the Z axis, I'm not convinced that the moment of inertia about X, or Y, would remain unaffected. The differences between the static moment of rotational inertia about X, and the spinning moment about X is what I've been wondering about. I does not make sense that it would be the same, although the simplistic math would say that it might. The bending force on the axle, of both gyros trying to precess in opposite directions should have some equal reaction resistant to that motion.
That's really a smart way to realise CVT. You invented that ?
Isn't this the basis of the enviola bike transmission? Other than the friction, it works great.
yeah it is basically exactly that - just a version you can make easily at home
very clever design!
doesn’t this also gear up?
Maybe a very fool question (according to what we know about "gears and transmission") but does it feel harder / easier to spin it when You change the ratio of in / output?
yes it does
Mountain music..much respect.. DVD:)
Your a genius, I don't understand why you don't go into production with your ideas
prefer to give them away mate
Some sort of centrifugal lever on the input side that pushes and pulls that lever to maintain a more stable input RPM while automatically increasing the output RPM would be interesting.
I was pondering a governor mate
We don't out grow making things. We just invent bigger and better ways to do it. I bet you were a Lego's fan. Love your work Rob
lol - yes i was lol
Think it would take longer to learn how to write the program for each shape than to physically machine them.
Um , the wind very seldom holds a steady speed , that would be your power source . But he said the speed is variable at the output end too . That’s puzzling to me . How do you handle torq ? In the C V T s I’ve seen , there is a belt that handles the torq , but the friction is what destroys the belt . In a car transmission , they are metal . In old toys with gas engines they are rubber mixed with Kevlar .
But on a wind turbine ? Talk about a maintenance problem !
There has to be a better way .
Learning could be so funny! Thanks 🙂
You bet!
Brilliant!
Marvel, how simple and logical, yet miraculous
Why does the title say 2014, but this was only uploaded 6 hours ago? 🤔
Theoretically it's single point contact which means it's unable to transmit much more than a hand crank force,. Reality is, it's not single point, resulting in friction and wear.
Wow! That is awesome!
That's very similar to the toroidal CVT designs I've seen, except they use a driven cone instead of a ball.
for sure mate
Brilliant! 😊👍
I love how you start laughing when you realise your design flaw 😉
I had an idea for a breaking system,
Copper and neodium magnets and a mechanism that puts them cloer as it speeds up.
Aft watching a heavy neodium magnet stop dead when swung at a copper plate last night gave me these idea so far. If u can fin it its worth watching.
Also u could maybe get eough power fome the minut heat that could be used as well possibly. Just still picturing it in my head xx
Already in production and used for roller coasters, maglev trains and land-speed-record test vehicles. Switch the copper discs/plates for copper coils, and you've got the regenerative brakes used in hybrid and electric vehicles.
Woah. Thanks man!
Look for RMS' 3-d printed "Chitty Chitty Bang Bangs" coming to a car park near you. Just got to scale up those 3-d printers a bit.
lol oh I am so tempted!
People who watch this channel should read the works of Buckminster Fuller.
The balls are being angled incorrectly, the axis of rotation of the planetary gears needs to always point towards the same direction, not apposing directions
1:30 that's what she said!
Love it
Is there any examples of this being used in real life??? This is so cool!
yes on nearly all small cars. Constantly Variable transmission. Very common.
This delight to see,
Like a Christmas present in a tinker shop under an intelligence tree.
The Santa Claus competition is ON! lol
Gnomo Paws vs Santa Claus!
I wish I could go on a shopping spree!
You should save your files to discord so the community there can enjoy them too.
i save them to thingiverse and tinkercad - just get them from there
That is so simple why haven't that system being used today
What if you add more balls
Could you not just print the ring in tpu?
yeah
I like it
awesome mate - cheers
A Beier variator is simpler and would require many less parts.
I don't think you know what the word "simpler" means. Neither "less"
("The mechanism consists of a spring-loaded stack of thin disks on a central shaft. Around this are arranged other stacked disk packs on a number of planetary shafts, usually three. These shafts are mounted on swinging arms, so that they may be moved in and out together. The Beier gear rely on on viscous drag through a thin oil film between them.")
Nice to see this all cvt's depend on friction is there a gear driven alternative
a ratchet cvt
xtronic cvt
Some men like to watch the world burn. Real men (or Timelords 😂😂😂❤️❤️) love to watch the world learn.
absolutely mate
Great idea, only, a bit too late. As the world is going electric, no transmissions are required.
!
we will see on that one i think
Very funny idea. Problem in practice is torque capacity and wear.
Nice.......Ummmm DVD:)
Kinda like a cuply on a pump but on they you oniy like .10 thousands of an inch
Keep well sir! =GunZenBomZ=
cheers
This type of CVT is used in the Enviolo step-less bicycle gear shift. I have one on my ebike, and it's so convenient to adjust my gear ratio on the fly to my liking while applying constant torque to the pedals.
Yep.just like the Schimano from 1958. 10 speeds, shift on the fly while pedaling.
I have a servo actuated version of it, Nuvinci Harmony. Automatic cvt . Infinit pleasure :-}
Brilliant!!
This is a great design and it's awesome you released the file for everybody, but my favorite part is just the joy it brings you using it. It's infectious.
lol - cheers mate
In following all your 3D printed projects you seem to have inspired a lot of people to learn to use a CAD program. I think that is wonderful. Hats off to you Rob! CAD drawing is such a useful and satisfying skill to have
Nothing's more useful than a drawing, whether to catch your own flawed thinking or to show people just what you've dreamed up 🙂
this style of transmission is used in millions of bicycles, an special oil is used which locally solidifies from the pressure so that there is no contact of the metal parts (preventing wear)
Non-Newtonian shear is TIGHT!
I don't think I will EVER be able to stop watching your videos.
Even though I think I have a reasonably good understanding of physics and engineering I'm continuously learning something new from you - as well as being entertained!
Thanks as ever, Rob - please keep doing what you're doing! 🙂
I would use as many balls as I could get around the edges so as to make sure power is securely transferred without slippage and without part damage.
I believe that the more balls you add the more friction will be generated, if you were using it for something (bicycle or a wind turbine as suggested) with a limited power output you would lose a great deal of the input energy. It’d also become really complex to control all of the balls unless they’re simply idlers - ie ones to hold the plates at a consistent distance. It’s a very interesting idea and the most dead simple CVT I’ve seen, to scale it up you’d want really solid metal circular plates for the input and output that won’t flex and solid bearing blocks and yokes to further minimize losses. While fascinating, I don’t think this is something that could really be used in a real world application but it’s definitely a cool concept.
@@sjsomething4936 Anything you add will increase friction. That is beside the point.
I would have no problem cycling it with a dozen drive balls on it, but it would slip with only 2 of them because the power to traction/friction ratio would be too small.
Just like adding fatter tires to a race car add rolling resistance, but without them, the car would just sit in one place and burn the tires off.
All mechanisms have tradeoffs.
Also, one need not have an actual whole sphere on these, a hemispherical roller would save on total machine mass, while also allowing the tilting mechanism to be closer to the center of both axis of said hemispherical roller at the same time [which offers some real advantages relating to strength of the mechanism and total mass and volume of the whole transmission].
To hold the plate at a fixed distance can be performed with some external thrust bearings, so that would not be such a big deal, and, depending on how much power one was applying to said device, might prove critical to keeping it rigidly in place under a load.
So far as making the main wheels [either partially, or entirely] out of metal, that would be fine, but if you want strength without a lot of mass, setting up a hardened steel set of races on the outside with something like magnesium or composite material for the most of the drive plates would make more sense than a heavy steel one.
I could see making something that safely conveys more than 50 BHP that weighs less than 10 Kg and takes up less than 1/10 of a cubic meter in volume.
Compare that to most 'infinitely variable' transmissions, and that is rather light.
I have an infinitely variable hydraulic transmission which is rated for 50 BHP and while it is about 1/10 of a cubic meter in volume, it weighs about 35 Kg, as it is made mostly from cast iron, machined steel, and some machined brass parts.
I think the parallelogram isn't the right movement, the control rod needs to cross the centre point, so the the inner axis' of the balls point in the same direction, not opposite, the two ball posts should turn in opposite rotations, i.e. one clockwise, the other anti-clockwise.
Is there a way I can send you a drawing to explain better?
it doesn't seem to matter - i tried it both ways and it made no difference so I went for the easiest mechanism - where the ball touches the ring might change that but for what i did - it seems ether is good - and the control rod does cross the centre of rotation that's why the offset cage
Crossing control rods are the right way to go for this build.
@@danedmiston9673 Agreed
@@ThinkingandTinkeringOne of the balls is generating friction then, and you'll probably only get the slower output due to the greater torque vs friction of the ball that is angled away from the output, if they have crossed members you could get the output to spin faster than the input too, though likely with a little more elbow work.
There seems to be one problem with the model, rather than using a parallelogram you'd want to be using something that would shift the shafts of the balls all towards one wheel. It gets noticeably louder when you turn the handle, likely due to one of the balls having more friction on it than the other one.
that doesn't seem right mate - and basically you saw it working - so I am not sure what you mean
@@ThinkingandTinkering With a single ball the mechanism works as you've described. But with the parallelogram one of the balls has the small radius on the red wheel and the other has the large radius on the red wheel. When in reality for a reduction you'd want both small radii on the red wheel and both large radii on the blue wheel.
It becomes more apparent as you add balls around the circumference of the wheels.
@@inventor121 i was about to say the same :) you are absolutely right
Replace the parallel bars with crossing bars and it will become self evident. @@ThinkingandTinkering
Ooh! Nice. Amazing demonstraion of a simple principle that's certainly in the "i'd never have thought of that" category.
But wait a sec... Shouldn't the two balls be rotating _antiparallel?_ I mean, when one ball's axis of rotation is tilted towards the red wheel, say, the other ball's axis should also be tilted _towards_ the red wheel, yes? Not _away_ from it?
it doesn't seem to matter - i tried it both ways and it made no difference so I went for the easiest mechanism - where the ball touches the ring might change that but for what i did - it seems ether is good
Correct, one of the balls was slipping and not contributing anything to the output rotation.
Blue Up Star ❤
Hmmm, my first attempt would have been to have kept both slower or both faster rotations of the small transfer balls to the same disc.
First glance tells me that one ball slips , I wonder why... interesting, And weird.
Guess I'll have a think about it later after I've had coffee.
One ball does slip because the parallel bars should have been crossing bars. As it is built one ball is fighting the other when not centered. I think that is why we were not shown the driven disc spinning faster than the drive disc. On this channel a video per day is a priority over accurate useful information, but it does keep guys like us thinking.
It looks like crab steering not Chinese puzzle as I would expect, the bar on the top should be a cross linkage not straight. Top down view would make it clearer.
it doesn't seem to matter - i tried it both ways and it made no difference so I went for the easiest mechanism - where the ball touches the ring might change that but for what i did - it seems ether is good
Your getting good at making 3D printed parts Robert, I love how you make them so everything just clips together. Thanks for sharing.
How to make your dog unhappy.
Love it. Really must get a 3d printer
Never seen that system before, outstanding. Thanks Rob.