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.
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).
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!
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 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.
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!
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!
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.
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.
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
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.
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.
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
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
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.) 🤷♂️
@@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! 👍😊👍
@@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.
