5 Planetary Gearsets in Lego

Three strengths of planetary gears: 1) The input and output are on the same axis. Normal gearboxes either require offset axes or multiple stages of reduction. 2) Planetary gears can reach much higher gear ratios in a compact space than can be achieved with an offset gearbox. 3) The gears in an offset gearbox push each other apart, causing uneven loads around the circumference of the radial thrust bearings. Planetary gearboxes even out this loading. By getting creative, you can do many interesting things with a planetary gear. I once designed a transmission that shifted gears by changing which gears were locked. It used two planetary gears in series. Impractical but fun to play with. It was decades before Techniques came out, so I did it on paper as part of my mechanical engineering degree. Turns out it wasn’t an original idea (see tank transmission), but it sure was fun figuring it all out. Be interesting to see if anyone can build one using Legos.

I think what got me into cars in the first place is seeing the Thunder Driller’s massive drill rotate while you pushed it around. That was peak lego

planetary gears are up there with the coolest mechanical doohickeys 🧡

Having all the pieces is the key… I don’t have them

The inverse planetary gear set is almost like differential

Lego 20 years ago: a great designer for small children Lego now:

there are a cople more of planetary gears. like the second smaller lego drill part, part 78442, part x784, planetary wheele hub(46490) and part 24121

Very good video ! If I have one tip for you is the focus of the camera that sometimes changes when you move your hands and it becomes blurry. Maybe setting the focus manually would help ?

Wow these are nice ideas

1:7 is possible with normal gears, since a 28 tooth gear exists. 28:8 + 16:8

Cool 😎

About the last one. Take a look at the lego part 6365803 "Wheel Hub No. 4" it has a built in planetary gear with a ratio of 5.4:1.

i love your videos

i like the idea of the third one. could it be made with the new version of the differential? the last one is actually pretty cool, i didnt know that was the case

#3 is practicaly a differental if redesigned a bit

8th comment! Happy New Year! (2024) (0:00)

3 is basically a dif

❤

Also all the lego differentials are planetary gearboxes

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