topic Re: Joint and motion for planetary gears. in Fusion Design, Validate & Document Forum

Joint and motion for planetary gears.

Anonymous — Sat, 25 Nov 2017 11:50:13 GMT

Hi all, I'm trying to familiarize with fusion360 and trying to realize a planetary gearbox like this one:

http://bestanimations.com/Science/Gears/planetary-gear-set-animation-5.gif#.WhlTMjkALFY.link

So, I can move the central spurg gear around its axis, but I can't move the 4 planet gear around both axis I need (itself and around the central spur).

Someone can help me with joints and motion?

Thanks in advance.

Re: Joint and motion for planetary gears.

lichtzeichenanlage — Sat, 25 Nov 2017 21:05:06 GMT

Can you attach or share your project?

Re: Joint and motion for planetary gears.

dieselguy65 — Sat, 25 Nov 2017 21:35:01 GMT

please share your actual model.

Re: Joint and motion for planetary gears.

jeff_strater — Sat, 25 Nov 2017 23:29:31 GMT

Well, I admit defeat on this one. I tried a bunch of approaches, using joints and Motion Links. Even Motion Study seemed to have problems with this.

For anyone who wants to take a crack at this, here is a simplified model:

Model is attached.

Jeff

Re: Joint and motion for planetary gears.

TrippyLighting — Sun, 26 Nov 2017 03:25:14 GMT

I believe this can only be achieved with the use of a 4th component,the planetary gear carrier. Without that component a planetary gear would be relatively useless.

Two motion links and a little math will take care of the rest. I might have oversimplified the calculation for the motion ratio of the planetary gear, but in concept the assembly works as intended.

Re: Joint and motion for planetary gears.

jeff_strater — Sun, 26 Nov 2017 12:48:11 GMT

Very nice, @TrippyLighting. I should have done more research on the mechanism itself! Thanks for the solution.

Jeff

Re: Joint and motion for planetary gears.

Anonymous — Mon, 27 Nov 2017 08:23:09 GMT

Thank all for your reply.

I'will try to add the the planetary gear carrier as @TrippyLighting suggested me and will keep you informed.

Re: Joint and motion for planetary gears.

Anonymous — Fri, 01 Dec 2017 15:44:07 GMT

With the carrier I obtained all movements but I'm going crazy with speeds.

Re: Joint and motion for planetary gears.

jasonhomrighaus — Fri, 01 Dec 2017 16:51:50 GMT

Here try this model, in particular note the use of the joints to obtain common axis points.

Re: Joint and motion for planetary gears.

jasonhomrighaus — Fri, 01 Dec 2017 20:52:04 GMT

whoops sorry posted in wrong thread