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1/8 offroad electric - Belt drive conversion ?

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1/8 offroad electric - Belt drive conversion ?

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Old 09-27-2012, 08:57 AM
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Default 1/8 offroad electric - Belt drive conversion ?

Hi,
excuse me for my poor English, I hope you will understand...
I have thought a third differential system for ours 1/8 offroad electric, wich allows us to drive power with only 2 belts.
The system is in this third diff, but I can't post picture, if any one can copy the link ?

[img]sylveris.free.fr/version-finale-eclate17.jpg[/img]

and this is one way to place it on the buggy : ( there are many combinations, depends of the Lipos you use )

[img]sylveris.free.fr/Sylver8E-example086.jpg[/img]

What do you think of this system ?
Thanks
Bye !

Last edited by KOULLIT; 06-19-2013 at 08:17 PM.
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Old 09-27-2012, 09:05 AM
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Originally Posted by KOULLIT View Post
Hi,
excuse me for my poor English, I hope you will understand...
I have thought a third differential system for ours 1/8 offroad electric, wich allows us to drive power with only 2 belts.
The system is in this third diff, but I can't post picture, if any one can copy the link ?

sylveris.free.fr/version-finale-eclate17.jpg

and this is one way to place it on the buggy : ( there are many combinations, depends of the Lipos you use )

sylveris.free.fr/Sylver8E-example086.jpg

What do you think of this system ?
Thanks
Bye !
Interesting for sure!
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Old 09-27-2012, 10:19 AM
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Those better be some strong belts! As heavy as 1/8 cars are, I would think the reliability would be a factor.....
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Old 09-27-2012, 10:31 AM
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Hi,
Can I ask you to post the pictures here ?
The links are in the first post.
Thanks
Bye !
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Old 09-27-2012, 10:37 AM
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Old 09-27-2012, 10:48 AM
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The layout is fairly proven for non center diff use (XX-4). Not sure what it would do with a center diff. It is an interesting idea, but it looks like a ton of rotating mass?
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Old 09-27-2012, 11:01 AM
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Thanks 84 GT 5.0,

Remember this is a third diff for 1/8, not for 1/10.



Bye !

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Old 09-27-2012, 02:18 PM
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Hi,
This is a 3D file to explain you the system.
It's an acrobat file, then just download the file and open it with adobe. Right clic to activate 3D view, then right clic for zoom, and left clic to move the part.
You will have access to all the parts because you can see on top of the 3D view, a icon wich allows you to see everything.

http://sylveris.free.fr/Center-diff-prototype-3D.pdf

Bye !
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Old 09-28-2012, 09:42 AM
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Originally Posted by KOULLIT View Post
Hi,
This is a 3D file to explain you the system.
It's an acrobat file, then just download the file and open it with adobe. Right clic to activate 3D view, then right clic for zoom, and left clic to move the part.
You will have access to all the parts because you can see on top of the 3D view, a icon wich allows you to see everything.

http://sylveris.free.fr/Center-diff-prototype-3D.pdf

Bye !
Thanks for posting this!
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Old 09-28-2012, 10:36 AM
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What is your plan for getting the rear belt around or above the motor?
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Old 09-28-2012, 12:28 PM
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Originally Posted by kufman View Post

What is your plan for getting the rear belt around or above the motor?
Hi, and thanks for the picture
I have 3 solutions, but actually, the 2 belt stalks will be place on the top of the motor. There will be a sort of little pulley for the first one, and the other one a little bearing, to change the angle toward the rear diff.
I will make changes on the version you can download in pdf file.
I think I will change the place of a bearing wich is in the body diff, to put it out of the diff housing. This is because of the belt "work", I think I have to "isolate" the axle wich drive the internal pulley, from the diff body.
Will make the changes and post you the new file with the mods.

Bye !

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Old 09-28-2012, 02:15 PM
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Hi,
This is the last version, then I changed the place of a bearing due to the belt "work" (the one on the black pulley).
This is the last pdf :

http://sylveris.free.fr/Center-diff-prototype-3D-2.pdf

The problem, but I don't know if it is a problem, is the distance between the two bearings. They are (mm) 13x24x6, then I don't know...





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Old 09-28-2012, 04:25 PM
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I agree with above, does look like a lot of rotating mass. Definitely won't be cheap either.

Can only get better though so keep going mate!
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Old 10-03-2012, 03:14 PM
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Hi,

This is the last update. I finally changed for the first solution about the internal bearing.
I have choosen some STS, STPS, STD belts and pulley, pitch 3mm.
Then I can't go with less than 14T, on the center diff pulleys, then I will go with 44/48 on front and rear diffs.
For the primary ratio, I would like to try 0.8m mod, then I have to go from 82T to 74T for spur gear. Then between 19T to 26T for motor pinion.







I know the front and rear diff will be higher than the original place on RC8 ( because it's my car ) or other...but I have no choice. It's maybe possible to have only 13T on center diff pulley, but I will have to make a material resistance calculation I can't do. Maybee with the soft, but I don't know exactly the real max power of our 1/8 Brushless motors, and I don't know exactly how to do with the soft.





Somebody asked me how I will place the belts, particulary the one wich is on top of the motor. This is approximately the way I will do it ( possible in front and rear position, with different lipos ) :



Excuse me for my poor english !
Bye !
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Old 10-03-2012, 03:17 PM
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Very interested to see how this turns out. Definitely keep us updated mate!
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