Variable Gearbox - Ravigneaux Gearset

Variable Ravigneaux gearset, 5 speeds via clutches but up to 7 are possible (6 forward, 1 reverse). Modeled, animated and rendered in Maya in 1080p 50fps.
0:41 First gear forward, orange carrier is blocked, engine is connected to the red carrier and blue is idling.
1:05 Second gear forward, blue carrier is blocked, engine is connected to the red carrier still and orange is idling.
1:30 Third gear forward, all assemblies connected to engine which gives a 1-1 ratio.
1:56 Forth gear forward, blue carrier is blocked, red is idling and engine is connected to orange carrier.
2:23 Reverse gear, orange is blocked and engine is connected to the blue carrier, red is idling.

[@whengrapespop5728]

This is the first time I’ve understood how this works. Awesome video!

[@axiom1650]

Thanks! I will make another when this hits 1 million :)

[@EngineersAcademy9204]

Planetory Gearbox Animation !! Superb !!

[@vadinhopsc]

Very clear and beautiful animation.

[@carlosaugustoortega6254]

Excelente conjunción de engranajes y acoples.Maravilloso

[@drummer_zay9493]

CARLOS AUGUSTO ORTEGA así es, la física de esta application particular es hermosa, que gran mente nos dio Dios para inventar tales maravillas!

[@SOPM2007]

I like the realism of the plastic parts!

[@axiom1650]

Thanks! I could make it much better if I were to re-do it though

[@08halit]

would be interresting to use it as an differential and have it locked as a 4 speed locket on 2 separate ways and gear it out on different rpm to save fuel

[@tigerseye73]

Good animation and useful design. I like.

[@peixetstudios]

Buen trabajo! Enhorabuena!

[@michaelbuckers]

It's not variable gearbox it's just a planetary differential drive.

[@SkylineFinesse]

i was about to say. pretty sure the 5HP19FLA in my audi contains this.

[@AutoReignMY]

It is variable as stated on the title, I think you meant NOT CONTINUOUSLY variable.

[@harrymu148]

its a planetary drive with different settings

[@RGV2300]

you can get 6 speeds here plus reverse, and it's a ravigneaux planetary gearset

[@guntherglaser5223]

Flugzeugfawerke

[@omegarugal9283]

4 speeds

[@danielramirezcruz.2209]

Good video interesting.. thanks

[@peixetstudios]

Muy interesante!!! :)

[@osamabadr1084]

Wonderful

[@MyAheer]

hi it will be very useful if u can animate a drivetrain of rear wheel drive mid engine car you know gearbox and differential i want to build one and don't know it works

[@valibekurinbaev8187]

good job

[@bledlbledlbledl]

Oh well that some SPIN on the planetary-gear idea :P

[@EngineersAcademy9204]

Yes !! Its Really Awesome

[@justanotherrandomperson1359]

Bad joke but ok I will congratulate you

[@uselessguys6621]

❤ super video very helpful

[@martinhickman3390]

Is this not very similar to the Sturmey Archer S3X hub, like AW hub but without the ratchet Pawls?

[@beaterbikechannel2538]

I was just thinking the ravigneaux gear set hasn't been used on hub gears as far as I know. Reverse isnt needed but it's got potential

[@mario_uzumaki]

it’s less weight, but the ratio is not as variable as manual gear set, harder to set up and more friction

[@21Trainman]

Is this how they make 7 speed hubs for internally geared bicycles?

[@wolfgangh.7027]

O.K.: Not continuously variable. They exist FOR bicycles since 1907 (3 gears), 1983 (5 gears) 1993 (7 gears). In use for automobiles also quite a long time. Wonderful to have a look to the inside of it :-)

[@DavidG2P]

Nope, not for bikes. Those were plain planetary gears, not Ravigneaux sets

[@wolfgangh.7027]

@@DavidG2P Sure? For example the Rohloff gear hub (14 gears)? What is the difference then?

[@DavidG2P]

@@wolfgangh.7027 You were mentioning 3/5/7 gears, I'm referring to those.

[@alphahelix91]

sperren die kleinen Räder um dann die Kraft auf die zweite Achse zu übertragen , oder handelt es sich um ein Paradoxon ? Ok das zweite ist ne Kupplung nur der Auslöser fehlt.

[@kristisx007]

wow you have just reinvented planetary reductor

[@axiom1650]

No, I just animated a random gearset.

[@eduardoluisjuillerat3523]

Versión moderna de la caja de cambios de Ford T, la que tenia 2 adelante y Marcha atras

[@chasinelwood1977]

Hey there. Is it possible for you to share the 3D models for this device? I'd be greatly appreciative of it

[@axiom1650]

Would you need it for printing? I started making a printable model but never finished it.

[@breakfast7595]

@@axiom1650 a 3d model would be great to learn the principle

[@sinomirneja771]

What dictates how fast the orbit is turning?

[@juancarlossaavedra4505]

It looks like a 3 speed gearbox

[@omegarugal9283]

4 and R

[@carmelpule6954]

It is a variable gearbox if the outside circumference is a slipping clutch.

[@susie3702]

put that way all auto boxes are variable if you slip the clutch

[@robertmcdonnold3038]

I think a little bit of dialogue for those of us who are not engineers would have been nice.

[@avid0g]

Why does the orange member have three arches? Does this reduce total mass? I would expect six spokes attached at tangents to the hub. Spiral-cut gears for torque and low vibration. Plenty of room for more planetary gears to increase torque.

[@axiom1650]

It's nothing but a fictional design, thanks for the insight though.

[@madilynb.5552]

sounds like something you could do ?

[@thepope2412]

I can see this being used in a high torque wrench

[@RayLovesCars]

Pretty common in ford automatic transmissions

[@riteskills]

and what's the difference between this and a regular automatic that's been know for ages?

[@axiom1650]

This is also nothing new (originates in the 40's). Ravigneaux gearboxes are common these days. The 'Simpson' gearbox was/is an alternative which has multiple normal planetary gearsets while the Ravigneaux allows for a smaller amount of needed gears & gear carriers. This allows a lighter and cheaper construction.

[@quillmaurer6563]

Is this related to the design used on the Toyota Prius? Or is it more like that used on automatic gearboxes with discreet gears and band brakes? Most of my understanding is manual transmissions (I've never taken one apart but I have a good understanding of their function - not so with automatics). I see four possible moving pieces, which basically means three inputs to one output. Lock one and that's two inputs one output, sort of like a Prius to my understanding (engine and motor as inputs, output to wheels), or lock any two and you have one input one output, which I suppose could be used in auto transmissions.

[@secrettree]

Yeah its like an automatic transmission where clutches lock the inputs at will. The prius transmission is very similar except it doesn't lock the inputs, it varies them using electrically. I think they use electric motors (as a generator) to vary the torque to the inputs. This way some of the energy can be harvested vs wasting it to heat like a clutch.

[@SANDSHOE]

Did this automatic transmission will work for electric engine?? See in my vlog...

[@beaterbikechannel2538]

This has a lot of potential for bicycle hub gears.

[@axiom1650]

Many bicycle hub gears use similar designs, this design is over 70 years old.

[@MyAheer]

mid engine rear wheel drive animation and if u cant plz send me the link of any available video

[@ReachShaunNow]

I can develop what you need. I charge though.

[@Ademann]

That's just the principle of the simple planetary gear!

[@axiom1650]

Well, it goes a bit further in that it's a double planetary gearset. Nothing new indeed, can't someone make an animation of something that has existed for almost a century?

[@Ademann]

@@axiom1650 Оkay everything is fine.

[@Ademann]

@@axiom1650 1890 company SturmeyArcher in England, produces first 100,000 bicycle hub gears with 3-speed planetary gearbox.

[@murraymadness4674]

@@axiom1650 well, the title is misleading, it should say Ravigneaux gearset animation, nothing 'Variable' about it as animated.

[@DownhillAllTheWay]

In all the machines I know (a car included) the gearbox drives an output shaft. In this design, there are two outputs turning at different speeds (apart from where the whole thing is apparently locked and turning as a unit). Before being convinced of its viability, I would have to see how it gets connected to the output shaft. It seems to me that further gearing would be required.

[@axiom1650]

You'd do well to re-evaluate your knowledge, this very design is in a good portion of cars on the road and has been used for almost 100 years. People seem to assume I'm trying to show something new here.

[@DownhillAllTheWay]

VRBTech - It's a shame you didn't back that up with more information - like which cars use it, and how the two output speeds get translated into a single speed to drive the wheels. I'm not saying you're wrong, nor am I arguing with you, but as I said before, "I would have to see how it gets connected to the output shaft. It seems to me that further gearing would be required". As two components of what you have shown are rotating at different speeds, there clearly has to be something more between this gearbox and the differential, in which case, the system you have shown is not the entire geartrain - but only a component of it.

[@mickvonbornemann3824]

Most torque converter automatics, I assume

[@nonyadamnbusiness9887]

@@DownhillAllTheWay It is a Ravigneaux gearset. In practice the ring gear is always the output, wet clutch packs and band brakes control the power flow to the input shafts. This system was used in 3 and 4 speed automatics. It was used in, among others, Borg Warner DG 150/200/250, M35, M8, M12, Ford FMX, AOD, and 4R70. As for which cars used it, Studebaker, Ford, AMC, Jaguar Rover Triumph MG, Citroen, Datsun, Volvo, SAAB and many more.

[@glsdelta1]

Clutches are used to couple the output elements to the output shaft.

[@AiOinc1]

Typically overdrive ratios are the final gears, not first! Otherwise very cool.

[@youtuber-xn9of]

hi. realy helpful and thank you very much for the video. which software did you use to create this animation. i need to create an educational video for children to promote disability awareness. it will be a great help. thank you

[@axiom1650]

Thanks! I used Autodesk Maya but would use Blender now.

[@MaitreFou974Officiel]

sounds like exactly the same that an GM automatic gearbox, for example on bmw E46, no ?

[@axiom1650]

No idea to be honest.

[@annaplojharova1400]

Many US 3- and 4-speed automatic indeed use this concept. The 4-speed then has another ring with a band brake around the orange planets (the physical arrangement is a bit different, of course), placing one gear between the 1'st and 2'nd of the 3-speed basic topology.

[@blu3_enjoy]

how do it lock

[@suzukispider]

variable how? it's a simple planetary set with an extra gear. and you can't turn the big one backwards if that represents the engine, engines only go in one direction. you showed orange held still twice, and the impossible backwards engine. other than the extra gear, how is this different from a standard planetary set?

[@axiom1650]

Variable: capable of being varied or changed; alterable; it is not a fixed ratio gearbox. The engine can be connected to any shaft (or the ring gear) via clutches, in reverse it still turns in the same direction. Something you could have figured by reading the description and a simple google search, which is where you'll find the answer to your last question.

[@piotrkaliszczyk1591]

Is this some kind of an animated rigid body simulation, or just animating rotations of the parts?

[@axiom1650]

Just animating the rotations.

[@vaioskaliakoudas6388]

Would this work in a car?

[@axiom1650]

This principle is used in many gearboxes in cars.

[@huntersmith1372]

Aren’t these used on some E-Bikes?

[@nonyadamnbusiness9887]

This is a Ravigneaux gearset.

[@rafiekahmed8568]

Hello where is the output taken fromm

[@axiom1650]

The output can be taken from different shafts depending on configuration, in this case the output is taken from the large outer inverse ring gear.

[@rogerbeck2085]

Where can I buy one

[@brucerogermorgan2388]

Planetary gear sets have been around for 100 years, what's so new about this one?

[@axiom1650]

Bruce Roger Morgan Absolutely nothing. Only for the purpose of animating the video.

[@ShocKBsB]

Bruce Roger Morgan -- At the age of 100 you had no comment. So what's new is you.

[@aliawadallhassnsaadhassn5397]

Severely complicated you can make it easy easy

[@entdeckungssucherderfinder2482]

Neues Automatikgetriebe von Citroen 🚗 ? 😉

[@leonardreynen2988]

this design has a fatal flaw, one of the planetary sets is supported on only one side, doubt that its used commercially.

[@axiom1650]

It's merely an animation/representation, not how it would actually be built.

[@jimgreene3863]

nice video BUT I hate it when there is no commentary or text about info on this very nice item

[@axiom1650]

There is some info right below the video. A good explanation can be found if you search "How Automatic Transmissions Work" by Thomas Schwenke. This video was merely made to test my hardware and software for rendering.

[@axelgaard1]

do you have 3d plans of this gear?

[@axiom1650]

Only polygonal model, and not very well optimised. I'll have to check if I still have the model.

[@JoaoHSP]

@@axiom1650 If you could send me, i'd really appreciate.

[@stevewyatt3339]

Ford Planetary..............

[@paulchainkang]

Could you provide the 3D models for 3D Print?

[@axiom1650]

I could if you would provide pictures of the result :) How do I send you the data?

[@paulchainkang]

@@axiom1650 Yes, I will provide pictures of the result, successes or failures. Please send the models to Disposable Temporary E-mail address: [e-mail] Thank you in advance.

[@paulchainkang]

@@axiom1650 Another way is to upload your models to Thingiverse, www.thingiverse.com/.

[@axiom1650]

@@paulchainkang I will need to make some edits to make it properly printable, what dimensions would you want the entire piece to be? And what are the tolerances of your machine? It won't be very scalable as I have to take the tolerances into account.

[@paulchainkang]

@@axiom1650In the case you need to spend more time and effort to make the mode printable, I would rather not bother you for this. May be next time, Thank you for the kind responses.

[@denispalmer1937]

a better simpler stronger system is available continuously variable, with reverse going into production soon, fewer moving parts,

[@amyvari4462]

Can you plzzz tell me the software name?

[@axiom1650]

Autodesk Maya & Redshift. However I'd recommend blender.

[@madilynb.5552]

do you do drawings of gear sets and animation ?let me know

[@axiom1650]

Yes, this animation was drawn, 3D modeled, animated and rendered by myself.

[@madilynb.5552]

i want to see a less complicated (in parts )planetary .

[@madilynb.5552]

compound gear ratios within a planetary gear set ,and to be able to change ratios easily .input sun gear held carrier out put ring gear .and only two sets of tumblers opposing each other ?possible?

[@madilynb.5552]

need more information ?

[@axiom1650]

I understand you mean more of an application since you talk about input/changing ratios? Definitely possible but I'm afraid it would take to long as I'm very short on spare time atm.

[@jackmatthews4437]

Sorry to say but this is NOT a variable gearbox, It is a an every day planet system used in many transmissions. 6 fwd's and 2 rev's, depending on what you hold and what you turn.

[@prochanel5865]

God job. Orang Indonesia kaga bisa bikin ini, bisanya ngamok2 minta jatah duit doang taunya. Cape deh.

[@TheGOATPerfectFunny3489]

Part name please .

[@axiom1650]

Purely imaginative part.

[@thiagopolli8129]

It is solidworks?

[@axiom1650]

No, modeled in Autodesk Maya and rendered with a GPU raytracer called Redshift.

[@oussamathedjfreeman]

Stl files to print plz

[@Greatdome99]

Still need clutches to change gears, so not that different than current automatic XMSNs

[@anrg726]

Invalid variator. For this you need 3 electric motors. If you have at least 1 electric motor, why invent a variator?

[@axiom1650]

Read the description? It's nothing more than an animation of a Ravigneaux gearset, patented almost a century ago.

[@Deste95]

actually you need only 1 electric motor to control the orange part, then you can get a variable continues transmission between the red one and the blue one. for example you can connect your engine to the red part, and your wheel set to the blue one, and use a small electric motor (much smaller than the main engine) to control the gear ratio

[@yamaan93]

send cads plz

[@clinthunt5933]

very cool yet not variable

[@MisbokulMisbokul-td3ww]

fire simplex device remover l video please

[@rogerwalsberg]

Not variable

[@axiom1650]

This was mainly a test for rendering animations, but it seems it's not the best choice of title, as it implies it would be a CVT gearbox.

[@HammyWheeler]

It is variable... just not continuously variable. Title is correct.

[@driverjamescopeland]

It's a spur gear planetary differential. You CAN build a variable transmission from any open differential... but it's not a transmission 'til you incorporate some means on controlling the bias. This is basically a single axis version of what in your average automotive axle. The core of the Toyota Prius transmission is based on the same principle.

[@Person01234]

@@axiom1650 I don't think "variable" implies "continuously variable". In fact I think the exact opposite - If something is "continuously" variable this must be to differentiate it from other types of variable that exist. CVTs are continuously variable because their ratio varies continuously (without steps). It inherently implies that being simply "variable" (in gear ratio) is something that can be done non-continuously. Otherwise CVTs would just be called VTs.

[@liod_9]

мой мозг не в состоянии это постичь

[@lostguy2023]

No sound? WTF?

[@eLJaybud]

It's called a planetary gearbox, nothing new here.

[@phalanx3803]

well yes an no while it not completely new its that no one uses it most planetary gearbox use 2 or more planetary's where this is one planetary meaning it can much more com pact but the mainstream keep using multi planetary's so this style never took off.

[@phalanx3803]

well yes an no while it not completely new its that no one uses it most planetary gearbox use 2 or more planetary's where this is one planetary meaning it can much more com pact but the mainstream keep using multi planetary's so this style never took off.

[@phalanx3803]

well yes an no while it not completely new its that no one uses it most planetary gearbox use 2 or more planetary's where this is one planetary meaning it can much more com pact but the mainstream keep using multi planetary's so this style never took off.

[@phalanx3803]

well yes an no while it not completely new its that no one uses it most planetary gearbox use 2 or more planetary's where this is one planetary meaning it can much more com pact but the mainstream keep using multi planetary's so this style never took off.

[@cuocsongtaybac868]

Hay

[@hoseinrezaei280]

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