LzREngineering

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?

Marcos.J

iTrader: (239)

robk

iTrader: (22)

Is this similar to the litemodz driveshafts with the ball bearings? If so, I hope the execution is better

LzREngineering

If they had dust covers/boots I'm sure they'd last ages. However it doesn't look like they are included.

DavidNERODease

It says on the website: do not use grease or oil.!?

LzREngineering

I wonder if that's just because they use ceramic balls?

Double D Donuts

iTrader: (15)

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!!!

DavidNERODease

I think the RC world needs this. The design would be ideal for miniature CVJ's. So simple.

1/8 IC Fan

iTrader: (102)

Yes FG Gröshl offered these style (rebuildable) over 30 years ago for 1:5 TC.

DavidNERODease

DavidNERODease

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.

DavidNERODease

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.

LzREngineering

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?

DavidNERODease

Exactly, but I'd still like to try them. Surely they've been tested by someone?

thecaptain

iTrader: (177)

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.