What makes planetary gearboxes so amazing?
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Published 2022-01-05
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#3dprinted #gearbox #planetarygears #ender3pro #gearratio
All Comments (21)
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The red lid you took off the superglue, there’s a sharp point inside the top of it - use that to pierce the new superglue rather than the metal tool you used.
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I love how natural you presented the process, including (1) sliiight size mistake, (2) superglue getting on your fingers (3) oops should've used gloves (4) oops should've sanded before mounting (5) okay this is not turning smoothly as I wanted (6) some things are dropping/disassembling themselves. Dang. It's clear you're One of Us 😄 Great video 👍🏼
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The ring gear is also known as an annulus gear.
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Monster trucks use these inside the wheels so the planet carrier is fixed, the sun gear is attached to the axle, and the ring gear is bolted to the wheel since it puts so much stress on the engine to rotate the huge tires.
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This is a wild coincidence. I've been having issues with my automatic transmission that I rebuilt. To wrap my head around how it's really working and what the problem is, I've been modeling it to 3D print a small replica. I've got two of the planetary sets done, but I need to figure out a one way clutch and how to manipulate the regular clutches. It's a big project, but will be awesome fully printed. (well somewhat small). A U140e transmission (plagued with problems).
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I think the table is misleading. Those ratios only work for a planetary gear systems with the same number of teeth on each gear. I made a clock with a planetary gear system and the sun to plant ratio (with the ring stationary) is a 6:1 ratio
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The leaking superglue was a plot twist i did not see coming. Out of left field. Really threw me for a loop. This is great cinematic storytelling. Nice little subplot to the overarching narrative.
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When I was an automatic transmission tech back in the 90's, I thought (and still do) that the coolest transmission was the 700r4 (the same gearsets used in the 4T60, 4T60E and 4T65E). Using only two planetary gearsets, it achieved 4 forward speeds (4th as overdrive) and reverse, and was the most compact 4 speed transmission of the 90's.
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This a cool project, but I still have a couple of questions... How did super-gluing my gloves to my hands assist the gears? How do I remove the gloves now? (You did that bit off-camera!)
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On heavy truck in the UK this gearing is used in the drive axle hubs, we call them double reduction hubs, it reduces the size of the crown wheel and pinion, thus giving the axle a higher ground clearance. 🇬🇧
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I think making inner handles' ends longer than the outer ones would make it more comfortable to rotate.
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Adding electric motors to the gearbox effectively turns it into a cvt. A thing toyota made in their hybrids. It works by spinning two of the 3 components in various directions and ratios to acheive infinitely variable gears. It is also probably the most reliable transmission ever created, as there is no friction material, nor a torque converter, just gears and electric motors.
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When John Deere came out with their power shift on the tractors, the 6 to 7 or 7 to 8 shift was very harsh. The dealer advised that was because one of the planetary gears, had to switch its direction of rotation, to complete the shift. Now it all makes more sense.
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The thing that people don’t understand about the gear wars is it really was never about the gears
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This is by far the best planetary gear system explanation I've ever seen
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What clearance are you using for the things to rotate when printing? Like how much gap is there between the pins in the planet carrier and the inside of the planet gears for them to spin freely without much friction?
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I've always preferred to use other adhesives like contact cement over superglue. IME superglue is exceedingly effective at sealing its own container shut, and it's nowhere near as good at adhering anything else.
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I don't know how it works in fusion 360 but in onshape there's a setting for backslash in the gear tool which makes it really easy to change the tolerances... Great video btw!
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Your model and explanation are the most clear i have ever seen! I am going to show this to my children so they can understand this powerful concept
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BUDDY!... I have been in automotive business my entire life and have increasingly seen this gear setup used in one more places over the years. Due to the detail and explanation in this video I can totally see why! For the first time! Brilliant! Thank you so much - so very sincerely
