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Old 07-03-2022, 08:53 PM
staybusy staybusy is offline
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Default 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.
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Old 07-03-2022, 09:10 PM
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Here is an example of a 1:20.
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Old 07-03-2022, 09:45 PM
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Calculator.

https://www.torcbrain.de/uebersetzun...riebe/?lang=en
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Old 07-03-2022, 11:10 PM
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Quote:
Originally Posted by staybusy View Post
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.
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Old 07-03-2022, 11:12 PM
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https://www.amazon.com/STEPPERONLINE...%2C1318&sr=8-2
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Old 07-03-2022, 11:14 PM
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Worm gear is an option as well.

https://www.amazon.com/NMRV30-Gearbo...%2C1114&sr=8-4
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Old 07-04-2022, 05:57 AM
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You want the driven 20x the driver?
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Old 07-04-2022, 03:39 PM
staybusy staybusy is offline
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Quote:
Originally Posted by Shade Tree Welder View Post
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.
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Old 07-04-2022, 03:46 PM
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Quote:
Originally Posted by staybusy View Post
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?
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Old 07-04-2022, 05:24 PM
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Quote:
Originally Posted by Shade Tree Welder View Post
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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