Hypocycloidal gear train

[nelsman]

Yes, seems that force is applied to both gears

[ryosvet]

Well isnt this the BASICof the BASIC of Rotary engine?

[SuperRafi1997]

small comment is lonely



[Mrpsychotehpyro]

This WAS USED !

A parallel motion can be made from such a gear configuration by slight changes.

And that brings us to the hypoclycloidal pumping engine, a 19th century steam pump that uses this thing instead of a normal crank.

Just google the term...

[gushee44]

@ all youtube vid-nappers: oh you marvelous fools, who so readily criticize the output of others. and what do you bring to the world, but your bad additude? my guess is that the additude itself originates from the fact that you have nothing meaningful to put forth, it is a sort of grumpy jealousy, which only helps to illuminate the ultimate absence of value in your inherently meager minds! muahahahaha!!!!

[Broadsmile1987]

also, a bonus:

mathpuzzle (a dot) com/LoonyGearsAnimation.gif

[Broadsmile1987]

Do You (in)put the force to small or big gear? I guess that to big, because small moves. So if You put it to the big one, why aren't the small one just rotating in place? Is it because of the teeth shape?

[PelletierPhysics]

@Broadsmile1987 There are 2 inputs. If you apply torque to the ring, and another torque to the shaft, then the small gear will have to roll.

[Broadsmile1987]

@PelletierPhysics that seems useless - what you get is a moving small gear, but you could achieve same output by reversing big gears rotation direction with another gear, and put the output on a big gear instead of a small :P This way You wouldn't overcomplicate things by dividing input into two gears plus making the second input move (imagine a steam machine sticked to the small gear, that's so stupid :D)

I can only see a room for a mathematical device, making a substraction: SG-BG=output

[PelletierPhysics]

@Broadsmile1987 This is a kinematics problem used in a physics class. You know two of of the angular velocities, you have to find the third, using relative velocities. It's makes the transition between the analysis of a rack and pinion and the analysis of a complete planetary gear set.

[TomCollins519]

@Broadsmile1987 its not useless! a kitchen aid stand mixer would use it to have an attachment(attached to the small gear) go around mixing bowl while also rotating.

[ikzelf100]

this look like the gear within the back wheel of a bike, when you got a bike with only 3 gears.

[chikotube]

would work great for variable planetary gear transmissions.

[wolveshockey1993]

is this how those hubless motorcycles work?

[patrick258181]

If you've ever used a power drill you can thank this gear.

[OhJeiArh]

I thought the title said "Hypocritical Gear Train" at first.

[Makinak42]

Now, normaly I don't comment, but I feel I must this time... at least to simplify. I see a lot of engineering haters. So...

At the very least, this cofiguration is a tutorial for more complicated versions. Such as the "ring and pinion" or spider, and the "sun and planetary gear system." The Hypocycliodal Gear System is a building block .

If you want to see a beautiful and advanced version,

google "Ulysse Nardin Freak" It is a most beautiful watch.

[Goldendroid]

Where would you find this gear thingy? A watch, or a factory?

[Kolenschopper]

Thanx for explaining the seeming uselessness of such device.

I wondered the same. Arent their more precise gears around by now? Hell, now i think of it, are there any clocks made today with such gears that are actually more precise than electricity or "modern"gears?

[cowboyvirus]

I am not familiar with the term "Hypocycloidal". It seems like a new term for an old device.

Also, in response to the question from BlondDogFunction

"What's the mechanical point of that? As in, what kind of steampunk device would use such a configuration?"

Such devices have been around long before 'modern' usage of steam. Not to patronize, but, their called clocks and watches buddy.

[PelletierPhysics]

@cowboyvirus I would say it's an old term for an old device: when Matthew Murray invented the hypocycloidal gear in 1802, he called it...hypocycloidal gear. In fact, the word is older than the device, because hypocycloid was already used in mathematics since a long time.

[Rendaylor]

@cowboyvirus it could be useful for having two different things rotate in opposite directions in the same space... for instance, helicopter blades with counter rotation

I'm sure there's other uses as well

[sifterbox]

@cowboyvirus sorry to say we think we are smart people 200 years ago had 5 times our vocab. Perfect example Deadwood most people say its vulgar and they cant watch it etc. they use a large vocab on that show and you have to watch it a few times to catch what they are saying sometimes like "pertinent C@&^%er"

[kabivose]

@cowboyvirus Not wishing to patronise but I think you mean "they're called..." :-)

Yes, I'm English so my spelling is "patronise".

[unarmedvictory]

nothing more than a reduction system, turn your outer ring and you center axis revolves slower. all this is , why use this when you can use planetary gear sets, with the option of locking the sun the carrier or the ring, and with more variables,... but this show at least an idea and ideas can lead to beter ideas.

[937256]

dre is only one side req of power ..d second gear teeth will follow

[BlindDogFulton]

What's the mechanical point of that? As in, what kind of steampunk device would use such a configuration?

[Thuringen]

some car differentials use something similar.

[ABCPRTEDFGHBV]

@BlindDogFulton

Such a gear is often used in lawn mower. There is only one engine that drives the rotor blades and the wheels forward. to insure that the wheel is not rotating at the same speed as rotor blades, you have to use a gear that often divides revolutions down by approx. 30 times. which means that the blades rotate with 150 km / h when the mower run at 5 km / h ...

[0jdh]

@BlindDogFulton Gears != steampunk

[jmchessman]

@BlindDogFulton

This is part of a planetary gear mechanism. You have one ring gear and one "planet gear" in this animation -- there would be one or two more planet gears and a central "sun gear" in the full mechanism. Planetary gear trains are used in automatic transmissions to achieve the different gear ratios.

[blazer551]

@BlindDogFulton its is used to create high gear ratios withiout using large sets of gears, if u lack space u might use that

[jasonrj8992]

what is the input? what is the output? what is causing the arm to rotate counterclockwise?

[cyborgtroy]

Magic for all three!

IRL you might use a planetary gear train which is sort of like this, but with three hypocycloidal gears, and a 'sun' gear in the middle.

The input and output are chosen from one of the following:

1. Sun gear

2. Outside ring gear

3. Rotating arm

And the third is held stationary, maybe.

[cyborgtroy]

@jasonrj8992 - Engineering Gnomes.

[Sw1mm3rX]

Woah! Sweet.

[UnderMan1965]

The inner shaft and the outer ring are powered by a motor in the back, otherwise the inner gear wouldn't move, only rotate in place, if the shaft was stationary, or the whole thing would turn with the outer gear

[bellinivernon]

Muy lindo !! ;gracias , desde argentina.

[angelica14709]

Power supplied to the outer ring delivered at the center shaft?

[pred408]

thats cool

but it gives me a head ache

good vid tho