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Miborg Rzeppa-style driveshafts

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Old 07-21-2019, 07:27 AM
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Default Miborg Rzeppa-style driveshafts

Has anyone tried these driveshafts?
https://miborg-rc.com/epages/box1912...%201917%20B%22

They seem quite pricey. Wonder how a Rzeppa joint (as used on full size cars) compares to a DCJ?
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Old 07-21-2019, 08:00 AM
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Originally Posted by LzREngineering View Post
Has anyone tried these driveshafts?
https://miborg-rc.com/epages/box1912...%201917%20B%22

They seem quite pricey. Wonder how a Rzeppa joint (as used on full size cars) compares to a DCJ?
interesting well if they last longer then they are for sure worth it
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Old 07-21-2019, 08:30 AM
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Is this similar to the litemodz driveshafts with the ball bearings? If so, I hope the execution is better
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Old 07-21-2019, 03:14 PM
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Originally Posted by Marcos.J View Post

interesting well if they last longer then they are for sure worth it
If they had dust covers/boots I'm sure they'd last ages. However it doesn't look like they are included.

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Old 07-22-2019, 05:09 AM
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It says on the website: do not use grease or oil.!?
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Old 07-22-2019, 05:26 AM
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Originally Posted by DavidNERODease View Post
It says on the website: do not use grease or oil.!?
I wonder if that's just because they use ceramic balls?
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Old 07-22-2019, 06:43 AM
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clicking around their site you can see this one has a plastic retainer of sorts. they have a high torque and stock set.

After looking closer you can see the plastic retainer is holding a nice dark ball on the top shaft. Very cool!!!
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Old 07-22-2019, 07:55 AM
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I think the RC world needs this. The design would be ideal for miniature CVJ's. So simple.
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Old 07-22-2019, 08:32 AM
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Yes FG Gröshl offered these style (rebuildable) over 30 years ago for 1:5 TC.
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Old 07-22-2019, 08:44 AM
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Default Spherical Gear


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Old 07-22-2019, 09:19 AM
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I've been researching and studying CVJ's for about 2+ decades trying to find a suitable design for R/C. I even designed a few of my own but nothing comes close to the simplicity of the Torvec.
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Old 07-22-2019, 01:35 PM
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Default Homokinetic Plane

There is no centering device to keep the balls on the homokinetic plane so that explains the warning about using grease or oil. The joint relies on friction in order to maintain a constant velocity performance. There is a lot of load bearing sliding friction with this design but it could still be better than a double Cardan.
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Old 07-22-2019, 03:29 PM
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Originally Posted by DavidNERODease View Post
There is no centering device to keep the balls on the homokinetic plane so that explains the warning about using grease or oil. The joint relies on friction in order to maintain a constant velocity performance. There is a lot of load bearing sliding friction with this design but it could still be better than a double Cardan.
So now I'm wondering, how does this 4-ball design differ from the usual 6(?) ball rzeppas on full size road cars, which are packed with grease and fail quite quickly if the boot leaks?

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Old 07-22-2019, 08:27 PM
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Originally Posted by LzREngineering View Post
So now I'm wondering, how does this 4-ball design differ from the usual 6(?) ball rzeppas on full size road cars, which are packed with grease and fail quite quickly if the boot leaks?
Exactly, but I'd still like to try them. Surely they've been tested by someone?
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Old 07-23-2019, 05:42 AM
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This is a pretty cool idea, I think there would be a few main concerns when scaling it down for RC applications.

What is the actual advantage to any of the above ideas? DO they weigh less, are they more efficient? Why not make some similar parts for a DJC and see if we can improve upon them?

The first is the angle in which we need to work at speed, do any of the above allow for the same "angles" as a DJC or similar?

The production costs at least initially are probably going to be much much higher than a typical DJC.
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