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.
@@Simple_But_Expensive It's been done with Legos. I can't remember who did it though unfortunately. Something along the lines of "mechanical principles" was in the title and there are a bunch of videos showing gearing. One had a transmission with a series of planetary gears. Edit: found it. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-SN--HW693Fg.htmlsi=ZniSBukN66OJs4BU
@@in1It seems epicyclic to me, and Wikipedia calls the sideways gear "planetary." Essentially you built a ring-and-pinion differential that is missing the ring gear.
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
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 ?
il est également possible d’obtenir des ratios particuliers (1/7, 11/3, 37/41...) en jouant avec des différentiels... mais le résultat est tout autant peu efficient qu’inutile ;)
