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-   -   How To Extract Highest Gear Ratio From Planetary Gearset (https://www.shopfloortalk.com/forums/showthread.php?t=53867)

staybusy 07-03-2022 08:53 PM

How To Extract Highest Gear Ratio From Planetary Gearset
 
Lets just say it's identical to this one: https://youtu.be/5piYEX-jRt4?t=298 (4:58 seconds)

Regardless of teeth or planet count there should be a universal way to get the highest gearing output: example power in through sun gear, out through planet carrier.

Anyone know?

PS - I don't want to stack multiple planetaries and want a 1:20 ratio or ideally as high as possible. I'm using it for a project.

milomilo 07-03-2022 09:10 PM

Here is an example of a 1:20.

milomilo 07-03-2022 09:45 PM

Calculator.

https://www.torcbrain.de/uebersetzun...riebe/?lang=en

Shade Tree Welder 07-03-2022 11:10 PM

Quote:

Originally Posted by staybusy (Post 785487)
Lets just say it's identical to this one: https://youtu.be/5piYEX-jRt4?t=298 (4:58 seconds)

Regardless of teeth or planet count there should be a universal way to get the highest gearing output: example power in through sun gear, out through planet carrier.

Anyone know?

PS - I don't want to stack multiple planetaries and want a 1:20 ratio or ideally as high as possible. I'm using it for a project.

Lock the Ring gear. Then the sun gear drives the planets and you get reduction
on the planet gear carrier. It is the most reduction, the smaller the sun gear
and the larger the planets the greater the reduction ratio.

Shade Tree Welder 07-03-2022 11:12 PM

https://www.amazon.com/STEPPERONLINE...%2C1318&sr=8-2

Shade Tree Welder 07-03-2022 11:14 PM

Worm gear is an option as well.

https://www.amazon.com/NMRV30-Gearbo...%2C1114&sr=8-4

Samcord 07-04-2022 05:57 AM

You want the driven 20x the driver?

staybusy 07-04-2022 03:39 PM

Quote:

Originally Posted by Shade Tree Welder (Post 785492)
Lock the Ring gear. Then the sun gear drives the planets and you get reduction
on the planet gear carrier. It is the most reduction, the smaller the sun gear
and the larger the planets the greater the reduction ratio.

Thanks, I tried that but only got a 1:4 ratio.

In my winch the planetary is 1:157. What they did is they cut the ring gear in half. Half the ring gear stays locked and the other half drives output. I want to avoid cutting the ring gear in an expensive planetary gearset but it seems it's probably the only option to get that crazy high ratio.

Shade Tree Welder 07-04-2022 03:46 PM

Quote:

Originally Posted by staybusy (Post 785528)
Thanks, I tried that but only got a 1:4 ratio.

In my winch the planetary is 1:157. What they did is they cut the ring gear in half. Half the ring gear stays locked and the other half drives output. I want to avoid cutting the ring gear in an expensive planetary gearset but it seems it's probably the only option to get that crazy high ratio.

So you have a gear box now? And you are trying to use it? Also what kind of horse power are you trying to put through this?

!:20 is not a high reduction?

staybusy 07-04-2022 05:24 PM

2 Attachment(s)
Quote:

Originally Posted by Shade Tree Welder (Post 785531)
So you have a gear box now? And you are trying to use it? Also what kind of horse power are you trying to put through this?

!:20 is not a high reduction?

Yea I already own 2 planetaries and some other gear sets. Trying to decide what's best for my application. Basically I'm attaching a 1-2 HP motor and making a shredder. The higher the torque the better.

from what I understand 1:20 is ok, 1:30 is recommended, but I want over 1:50 at least, ideally 1:100 or higher. I don't want it to ever jam up unless the gears teeth sheer off.


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