Planetary Gear Reduction Drive

ZooHead · Jan 10, 2014

Planetary Gear Reduction Drive

Gear drive systems, there's a Pandora's box if I ever saw one.

While searching for inspiration on the web the other day I came across
a two stage planetary gear reduction drive for a radial inflow turbine starter. (Note: It's actually an axial inflow turbine starter.)
It was one of those u-tube repair videos so you get in real close as the
narrator describes how it works. He didn't say what it was a starter
for or what it was from, but it was just the thing I was looking for. (Note: It's an aircraft part.)

The original is completely enclosed so for visual appeal I'm only using
the gear positions and designing my own skeletonized frame.

This is stage one with a single frame member, more to come.

WEEDO WONKA · Jan 10, 2014

Very cool object and very clean renders :icon_thumbup:

Time to a project like this?
http://www.mohsen-saleh.com/2012/01/i-have-been-living-in-milan-for-last-3.html

Chris Heath · Jan 11, 2014

That's really cool.

ZooHead · Jan 11, 2014

WEEDO WONKA said:
Very cool object and very clean renders :icon_thumbup:

Time to a project like this?
http://www.mohsen-saleh.com/2012/01/i-have-been-living-in-milan-for-last-3.html

Thanks Weedo, and thank you for the link, that was very interesting.

The math hurts my brain.

ZooHead · Jan 11, 2014

Chris Heath said:
That's really cool.

Thanks Chris, this one has been very satisfying, let's see if I can finish it. :icon_thumbup:

ZooHead · Jan 11, 2014

I made the ring gear and in the process I found the
cylinder object has a maximum limit of 250 sections.
I needed 252, so I made it 126 and then subdivided.

I still have some more work to do, but it's is getting close.

Pat88 · Jan 11, 2014

ZooHead said:
I made the ring gear and in the process I found the
cylinder object has a maximum limit of 250 sections.
I needed 252, so I made it 126 and then subdivided.

I still have some more work to do, but it's is getting close.

Great job Eric :icon_thumbup: following with interest, if this is just getting close I can't wait to see the final reults

Cheers, Pat

WEEDO WONKA · Jan 11, 2014

just a question..
why did you need so many sections?

84 / extrude / subdividsion is not enough?

ZooHead · Jan 11, 2014

WEEDO WONKA said:
just a question..
why did you need so many sections?

84 / extrude / subdividsion is not enough?

I used the cog spline and extrude first, I should have
just used a tube or cylinder. Thanks for the tip. :icon_thumbup:

ZooHead · Jan 12, 2014

I just finished building the frame, also technically called the planet carrier
in this configuration, and I thought it was pretty enough to show by itself.

ZooHead · Jan 12, 2014

Getting real close, just a few tweaks and I'll animate the ring gear.

But now time for some fun...

Here are the laws for a single planetary gear system, can you figure out which law is true for this system?
Keep in mind this is a two stage "hybrid" so it's not that apparent.

Planetary Drive Laws of Operation

When there is an input and output, and no reactionary, the result is Neutral.
When the planet carrier is the output, and there is a reactionary, we get Gear Reduction.
When the planet carrier is the input, we get Overdrive.
When the planet carrier is the reactionary, we get Reverse.
When any two members are locked together we get Direct Drive.

Rene66 · Jan 13, 2014

This is some amazing work - striking and beautiful - WOWZA!!

Pat88 · Jan 13, 2014

Elegant modelling Eric, great renders too, my best shot No. 4. Looking forwards to the working version.

Cheers, Pat

ZooHead · Jan 13, 2014

Rene66 said:
This is some amazing work - striking and beautiful - WOWZA!!

Thanks Rene, I've enjoyed doing this one.

I was testing to see if I could do it with Cheetah splines alone and no Illustrator.
I even did the ring gear that way and as Weedo pointed out,
It would have been better to use a cylinder for that.

ZooHead · Jan 15, 2014

Here is the fully animated version in my dropbox.

Pablo Petzen · Jan 15, 2014

cool render bro. =)

just a tip, on videos try to use a solid color background, gradient aways get distorted.

Pat88 · Jan 15, 2014

That's a real beauty, great job Eric :icon_thumbup: :icon_thumbup: :icon_thumbup:

Encrypt · Jan 15, 2014

Very cool.

I was looking at those cheap radio control helicopters, figuring out how they work and thinking about drones and what not. as you do, anyway it got me to thinking that this sort of gearing set up could be used for contra rotating blades.

I doubt it is how it is done but it was fun, I think watching anything clock work is kinda relaxing and interesting.

ZooHead · Jan 16, 2014

Pablo Petzen said:
cool render bro. =)

just a tip, on videos try to use a solid color background, gradient aways get distorted.

Thanks Pablo, an excellent tip I need to heed. :icon_thumbup:
I should know better... it's what I do for gifs. :redface:

ZooHead · Jan 16, 2014

Pat88 said:
That's a real beauty, great job Eric :icon_thumbup: :icon_thumbup: :icon_thumbup:

Thanks Pat, I believe I need to work on animating the camera.

Anybody recognize the camera motion... A rookie mistake, two
key-frames with the expectation of orbiting around an object, but
to the untrained eye it looks intentional. :redface: I get a little impatient
sometimes so I rush to render something. I guess I'll make
myself animate this to death and learn as much as I can.

Updated animation.

Planetary Gear Reduction Drive

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