M47 PATTON TANK PLANETARY GEARS PRINCIPLES AND OPERATION 85464
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- เผยแพร่เมื่อ 16 พ.ค. 2024
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A U.S. Army training film circa 1953, the first of a two part instructional video describing the advancements of planetary gears (used in the newer tanks such as the M47 Patton) as compared to the older system used on such tanks as the M-4 Sherman. A technician demonstrates the principles of operation governing multiple sets, while a narrator gives a short review of how the planet-carrier gears work. Features original footage of tanks performing tests and exercises as well as the demonstration on a planetary gear model. This video was mainly used to instruct tank drivers during the Korean War about their vehicles and its gear mechanisms.
The M47 Patton is the second American tank to be named after General George S. Patton, commander of the U.S. Third Army during World War II and one of the earliest American advocates of tanks in battle. It was a development of the M46 Patton tank mounting an updated turret, and was in turn further developed as the M48 Patton.
An epicyclic gear train consists of two gears mounted so that the center of one gear revolves around the center of the other. A carrier connects the centers of the two gears and rotates to carry one gear, called the planet gear, around the other, called the sun gear. The planet and sun gears mesh so that their pitch circles roll without slip. A point on the pitch circle of the planet gear traces an epicycloid curve. In this simplified case, the sun gear is fixed and the planetary gear(s) roll around the sun gear.
An epicyclic gear train can be assembled so the planet gear rolls on the inside of the pitch circle of a fixed, outer gear ring, or ring gear, called an annular gear. In this case, the curve traced by a point on the pitch circle of the planet is a hypocycloid.
The combination of epicycle gear trains with a planet engaging both a sun gear and an annular gear is called a planetary gear train In this case, the annular gear is usually fixed and the sun gear is driven.
Epicyclic gears get their name from their earliest application, which was the modeling of the movements of the planets in the heavens. Believing the planets, as everything in the heavens, to be perfect, they could only travel in perfect circles, but their motions as viewed from Earth could not be reconciled with circular motion. At around 500 BC, the Greeks invented the idea of epicycles, of circles traveling on the circular orbits. With this theory Claudius Ptolemy in the Almagest in 148 AD was able to predict planetary orbital paths. The Antikythera Mechanism, circa 80 BC, had gearing which was able to approximate the moon's elliptical path through the heavens, and even to correct for the nine-year precession of that path.
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This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD and 2k. For more information visit www.PeriscopeFilm.com
Amazes me how well these old army films explain things... far better than *_any_* CGI video I’ve seen !!!
They had to take much more care to explain precisely and comprehensively because it was so much harder to show stuff for real without the CGI and they expected the audience to know absolutely nothing, so basics mattered. Also in those days, you had to be good enough to use what you were taught in an actual war say, not just pass some exams with MCQs.
Also they are geared so that someone with a 9th grade education can understand. (Pun fully intended)
These old films are excellent for teaching our youth! As a retired patent agent and avid techno-geek, I am constrained to quibble with the interchangeable usage of two terms that have different meanings; it is surprising that nobody else has caught this little faux pas in nearly 6 years. In the first example, at 2:36, the sun gear is said to revolve, when it never revolves, but rotates about its own axis. Same issue beginning at 3:23, where the terms "revolve" and "rotate" are used backwards. Something rotates only about its own axis and revolves around any axis other than its own; thus, only the planetary gears can revolve, while all the gears can rotate. The error is repeated sporadically throughout the video. But aside from my technical nitpicking, it is well made and an excellent teaching tool that doesn't rely on cartoons, sound effects, or background (which can be annoyingly distracting).
Thank you for saving, restoring, and posting all these valuable pieces of memorabilia which are also very educational. Ciao, L
I totally agree. Great vids. Thanks
This presentation is actually very good. Not all are. Some,though modern,just don't communicate all that well. This one does. It demonstrates a lot,and in a very comprehensible way.
I have learned more from this 1 vid than I have in years on this type of transmission.
As a millwight, I find these very educational. Gearboxes are usually just throw away now days. Or, rebuilt by some other companies. Not, that we have any of these types but, it's just good stuff! I really appreciate it and thank you for sharing with me and everyone else.
These principles are exactly the same in modern auto transmission s. They have 6 to 8 forward speeds now, but the guts works exactly the same way. They use variations of the Simpson or Ravagneau gearsets which are built on these same components and laws. CVTs are a different animal though. Amazing that Ford T trans also works similarly inside!
One more video explaining how they work when compounded together in various ways and a calculation of the compounded gear ratios, and voila, now you can understand any automatic transmission! So well demonstrated and explained!
When there is an input and output but no reactionary you get neutral idling.
When the Planet Carrier is output and another element is reactionary you get reduction.
When the Planet Carrier is input and another element is reactionary you get over drive.
When the Planet Carrier is reactionary and other element are mobile you get reverse
When two members are locked together you get direct drive with both the input and output shafts rotating at the same speed.
This is literally what they teach engineers in third year at my school. I'm using it to study for a test.
I had to rediscover this gem. I am happy that this is still available. TH-cam University is available for a PhD
Why are these old films so much better than the new ones?
Thanks periscope for this video i completely enjoyed this video
Understanding planetary gears is important to getting to know about automatic transmissions. The "wild" thing is: The Model "T" Ford (a car FAR from having automatic ANYTHING!) used a planetary gearbox! As primitive as a car could get, but had this concept YEARS ahead of it's time!
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These videos are really educational and easy to understand. Excellent teaching.
This is old, but still amazing.
Thank you for this video.
Thankyou Mr. Walter Gordon Wilson for your Ingenious Invention and Patents of the "Self Changing Gears/Improved Gears" for the Epicyclic Sun and Planetary Gears and Fluid Flywheel Drive & Driven Coupling Transmission System for the Early Pre-Selector Epicyclic Transmission Gearbox (Originally developed for the British Tank of WW-1) and Later, The Mono-Cyclic, Pneumo-Cyclic and Hydro-Cyclic Transmission Gearboxes. These "Semi-Automatic" Transmission Gearboxes are the Forebears of today's Modern Automatic Transmission Gearboxes.
You failed to mention the glove box, I think he had a patent for that?
A great video. Very informative w FACTS
This is really an educational video. It holds you up by its clarity of ideas expressed.
best movie i ever watched on youtube
Really a great film!
U can Also combine the carrier with a sungear so you get 5.4 to 1 gear ratio multiplied three times
So 5.4:(1-5.4):(1-5.4):(1-5.4):1
My electric screwdriver uses this transmission style
Good vid!
I think our brain absorbs better information when taught with black and white videos, honestly 1930s learnin videos are far better than todays cgi’s
This is the 4th bloody time TH-cam recommended me this video...
And the 2nd time I watch it lol
Nice information sir
i dont regret watching this vid👍
Loved it
not what i was wanting but enjoyable none the less
that must be a very early model m47, the shifter only remotely resemble what I used in my M47 way back in 1956. As I recall, we had whatwascalled a wobble stick. it was an inline shifter. all the way foreward was park, 1 notch back was Low, 2nd notch was high, 3rd was Neutral, in this position you could spin the Tank in place, called neutral steer. all the way back is reverse, you had to squeeze a lever on the wabblestick to engage reverse.
Been a whole lot of years since I drove a M47 but nothing in this video looks anything like what I remember, the shifting shown is nothing like what I remember, the brief view of driving was nothing like what I remember. We had a wobble stick for shifting and steering, the shifting was as follows, the wobble stick shoved all the way foreword was LOW, pulled back one notch was HIGH, back another notch was NEUTRAL, grip the lever mounted on the stick and pull back another notch was REVERSE. TO Steer RIGHT AND LEFT, grab the top of the wobble stick and push it to the right to steer right, pull it to left the steer left. If you wanted to spin in place, called neutral steer, grab the lever and squeeze and push or pull the wobble stick, the tank will spin in place. I could not tell for certain but the tank shown most likely was an M48. The shifting mechanism in this video was nothing like what I used in the M47 I drove.
sir i want to explain epicyclic gear train in Hindi language on my youtube channel, can i use this video, i am a teacher and teaches on youtube, plz only this video
The Model T used a planetary transmission.
So does about any automatic transmission,I built em over 30 years.
2nd part of the documentary - compound gearsets and multiple inputs : th-cam.com/video/4HPtIXlno3w/w-d-xo.html
Whoo Hoo! THANK YOU!! I am frustrated when I can't find the REST of a multipart film. 👍😊👍
I fully understand the principle of getting different ratios and understand that an automatic gearbox uses band clutches to hold one of the parts to be reactionary. But I can't get my head around how in the gearbox the sun gear, the planet carrier or the ring gear changes it's role to be the input or the output.
My wife asks over her shoulder, honey, what are you doing back there on the computer. I said I'm watching.... M47 PATTON TANK PLANETARY GEARS PRINCIPLES AND OPERATION.
Oh, ok.
bet you didn't expect that for a response did you honey?
nope.
Exactly!
I'm sure if I watch it a few more times it will start to make more sense 🙄🤤
Watched it once, have no clue what's going on.
Good video but you should edit the title. The original title is TF-9 1855
PLANETARY GEARS PRINCIPLES AND OPERATION-PART I-SINGLE SETS
If we described it that way, no one would ever find it in a Google search!
I was actually searching for that title, as most other youtube channels only have part II about multiple sets and people can't find part I. I almost didn't click it because of the M47 Patton, I thought it would be about the tank only.
Thanks for the reply
Jeremy fielding sent me here
The tank used in the video is M41, not M47
7:54 - Hueels
i saw an m 41,and some m 46 tanks,but missed the 47.
These appear to be Walker/ Bulldogs....these tanks later given to ARVIN (Army of South Vietnam)?
I have a question and would be thankful, if someone answered me :D
This kind of manual transmission seems laughably simple compared to standard manual transmission, so why isn't it used more frequent ?
It was used on a VERY famous car: The Model "T" Ford used a planetary MANUAL transmission. Also "traditional" AUTOMATIC transmissions (Hydramatic, Torqueflite...) have planetary gearsets. As to WHY planetary gearsets are NOT used in modern MANUAL transmissions? I don't actually know. I'm SURE that some transmission mechanic has a plausible answer! Then again It probably comes down to money. Perhaps it costs more to make a system for controlling the bands that it does to make a system for sliding gears on a shaft (as is done on a "traditional" manual tranny.) 🤷♂️
@@jamesslick4790
Thank you so much for the answer, I'll look into the ford model t a bit more !
@@adh615 No problem! I am a GM guy, and I am NOT a huge fan of Henry Ford as a man, BUT The Model "T" is a fascinating car by itself as a mechanical object! 👍😊👍
They use planetary gears in some trucks in the gear split hi to low and dd
@@adh615 planetary gears are very compact, versatile, can handle MASSIVE amounts of torque, have very few parts, are very durable and hard to sheer. the hubs of monster truck wheels use planetary gears, also automatic transmissions and transfer cases in cars use them too. the downside is you might have to stack planetarys to get the ratio you want, also the ring gear seems to be a pain in the ass to machine.
15:25 direct drive
Neutral steering seems to have been know for a very long time I wonder why the Soviets never implemented it and the Russians still don't.
Music sounds like an old western.
Kind of surprised the outputs weren't directly compared to a 3-speed auto transmission; you've got neutral, reverse and three forward speeds. Most kids in the '50s knew what that meant and it's pretty much irrelevant that the highest ratio is an overdrive.
There is another part to this video.
@@srinitaaigaura Got a link?
Actually it takes 2 planetary gear sets to get suitable gear ratios for a 3 speed!!!
i wish i could talk to them
I do not understand how clutch works
It took an E-7 to hold a pointer?? No wonder I stayed Spec-4.
Hey, getting your quals signed off to operate attentions focusing device 001 is hard!
It's all about smart phones and celebrities these days. I prefer old philms about epicyclics.
nowadays, all the proverbial “one armed paper hangers”would be so offended by this video and crying out for apology.
Meanwhile CGI 21st century automatic transmission video -- keeps adding one more clutch pack to ever increasing levels of incomprehension.
Is that the Looney Tunes logo?
The Ukraininans cant seal the deal because their soldiers don't have videos like these.