Why Planetary Gear set is really amazing?

[@IO-zz2xy]

Gear mechanics is increadably facinating to me. The different types of gear boxes and infinate number of combinations is mind boggling and awesome. A mechanical science on it's own. Regards from South Africa

[@Jacopski]

All the videos I watched on this subject either assumed the carrier or ring gear to be stationary and don't explain how either or could be the case and how it can be reduced further, great vid

[@vincentrobinette1507]

Assuming both planetary sets have the same ratio, (3.33:1) You MULTIPLY the reduction of both gear sets. The answer is A. (~11.1:1 final ratio)

[@johnpenner5182]

quite amazing - and nicely explained. i come from an electronics background, and dont know much about gears and mechanics. in electronics - you have a transformer - which takes a certain voltage (120volts) and reduces it to another voltage (5volts) - it entails a power reduction - but how is this done mechanically!? when one thing is turning faster than another!? how do you make the faster thing turn the speed of the slower thing (imparting greater power and torque)!? 🍃 the ingenious PLANETARY GEAR is really amazing - a mechanical transformer! thank you for your excellent explication! the animation is superbe, the explanation itself is clear, and the voice is clear, and one of the more pleasant sounding english robot voices ive heard (you can tell where it lacks plural inflections).

[@onerarda174]

I understand that as the 30 teeth sun gear rotates, planet gear transfers this 30 teeth among the 70 teeth of ring gear causing 154.285 degrees rotation of the carrier. But why this turn causes additonal turn at sun gear? (video time 4:18) Is it because of the linear motion transfered to the sun gear by the carrier? Can you please explain?

[@michaelp2922]

My exact question. I feel like this part can be clarified more.

[@onerarda174]

@@michaelp2922 I found the answer. Planet gear's motion is a compound movement. It rotates by itself and around the sun gear. The linear velocity at the ring gear contact point must be zero. In order to compensate this, the second movement (carrier around the sun gear) must be done. This second movement causes the additonal turn because the teeth of the planet gear is in contact with sun gear.

[@michaelp2922]

​@@onerarda174 Does that mean because the planet gear also rotates freely by itself, and it rotates in the opposite direction as the sun gear, it is still driven by the sun gear but also travelling "backwards" on the sun gear so there must be additional rotation of the sun gear to achieve the 154 degree rotation of the carrier? Sorry, this concept is really confusing to me for some reason. I think it's one of those things that I would understand much better with a real life model.

[@onerarda174]

@@michaelp2922 What you say is true, sun gear has to catch up the carrier rotation. By the way I calculated the technical gear ratio by using angular and linear velocity formula (V=w.r). It is the complete explanation but a little bit complex. Maybe I can explain that page by sending you. How can I send you?

[@fernandohood5542]

Your not the only confused by that statement.

[@seshachary5580]

very educative thank you regards

[@riderzero62]

awesome explanation. final gear ratio = option A.

[@omi-gear]

Is torque double at the center of planet gear or circle of gear, or center of driven shaft... How we calculate.?

[@FlyTseng-x1y]

Great-tech, good job

[@fernandohood5542]

What happens if the ring gear is not fixed and the planetary gear is not fixed and an input is given to the sun gear?

[@jeffreyharbin5211]

neutral gear, any time there is an input without a held member (reactionary member) there will be no torque produced at the output shaft so you get neutral gear,

[@wowmewowyou]

❤wow! This is awesome. Thank you!

[@pranavmoudgalya918]

11.1 is it?

[@JarppaGuru]

no its 11,0889. there is no (approx) would be chock if it exac 10:1 xD

[@benedettospampinato6759]

Very appreciate, thanks

[@khazzxplore4963]

Jee jee preshar yakee iko ngapi kuzungur shaft

[@eyyayy9525]

Can you give me an example of application where the sun gear is fixed ring is output

[@anitapritam]

Overdrive used in automobile

[@drins9932]

Planet carrier - input Ring gear- output Sun - held = 4th speed forward Low Overdrive Planet carrier - input Sun - output Ring - held = 5th speed forward high Overdrive

[@JarppaGuru]

Planet carrier - output Ring gear- input Sun - held 1+Zs/Zr=1,4285:1 Planet carrier - input Ring gear- output Sun - held same ratio reversed 1:1,4285

[@ramonhamm3885]

What software is used for the awesome 3D models and animation?

[@parthivpathak5107]

Solid work

[@johnpro2847]

I find music during instructional films distracting ...otherwise good thanks.

[@SssshirazzzZ]

i thought it was verging on distraction but overall a nice touch

[@shibruwondafrash8729]

Nice

[@bhagsing3749]

Thanks ❤

[@FlyTseng-x1y]

Great

[@nemichandkumbhkar2637]

Isme 7,8,9 speed gear kase kam karte hai

[@RealMesaMike]

Why can't we have real people reading the narration? The computer generated voice sounds really stilted.

[@Jane-es9ez]

a planetary has a ring that has an inner and outer diameter and the outer diameter is always bigger then the inner and the torque is the same so if you put a gear of equal size as the center on the outer diameter the gear will move more times with the torque of the ring and if you put a planetary of the gear that is on the outer ring the next planetary will have more torque then the first and can move the same speed making a 1 to 1 ratio increase torque , i am having only arguments with designers , maybe you can do the design to explain therei is a inner diameter and outer diameter on the ring gear and the outer will always be bigger and have the same torque as the inner

[@khazzxplore4963]

Ring gear inarote marangapi kwa sakol kishaa inazungukomragapi kupiagear nyegine ilkuwalizmzunguko kwa kila gear

[@12thmaths54]

3,33x3,33=11,08

[@JoshScotty135]

What would these be used in? Can you make a video with examples?

[@EredediIsildur]

if i can't use these for turbo duels i'll be really disappointed

[@Electrodudimanche]

It's used in cordless drills as it makes for a very compact gearbox assembly

[@MarcABrown-tt1fp]

These are used in series on all automatic car transmissions

[@christophermichaelson9050]

Turboprop engines (e.g. the PT6). They reduce the output shaft from 36000 rpm to about 5000 rpm depending on application.

[@JorgeGarcia-sl6xj]

Formó parte de la transmisión del Ford T. Los engranajes se los puede ver como palancas.

[@ประมวลวรภาพ]

D = 4.45 and make Cycloid gear please.

[@donerickson7305]

Invented and found on alien spacecraft

[@graphguy]

I'm dumbfounded

[@Chandler-x9b]

Because the video is wrong it’s still 2.33… each time the central gear with 30 gears turns 360° the planet gear travels an equivalent 30 gears of 70 on the blue rim gear which is 30/70=x/360° or 154.28° for each complete rotation of the driving (central) gear… So 360 (driving) / 154.28 planetary = 2.33 ratio and the sun gear must travel 840° for a full 360° planetary/carrier shaft rotation not 1200° like it says in the vid

[@deepthipedjagari5730]

28.64 answer

[@sam.dinesh.8516]

👍

[@Fireneedsair]

Confused

[@thanadthasainak8547]

A ) 11.1:1

[@Chandler-x9b]

Nope still 30 gears acting on 70 gears. 2.33 is the ratio

[@AlirezaMalekpour-v6s]

B

[@MikeLike8]

C

[@reallifework1375]

D

[@dadudidami]

HANG MEMANG FAKKK

[@jimmycricket5366]

Ratio will be 2×3.33= *6.66 :1*

[@sugan5669]

you need to multiply the ratios with each other. for same ratio this is 3.33^2=11.1 :)

[@robroberts2064]

@@sugan5669 Sugan is correct

[@federicomuratori]

Why is that?

[@robinhammond4446]

Can't listen to this rubbish.