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Old 06-23-2010, 03:24 PM   #1
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Default Disc spring as Centax clutch spring ?

I have heard some people are running disc springs as clutch springs. They should give a more contant (less temperature sensitive) clutch and by using more discs on each other it is possible to controll the strength.
http://www.schnorr.de/en/germany/pro.../disc-springs/

Anyone with experience ?

I also found the same kind of springs to give a pre-tension on bearings, sounds like an idea to use is as shim to fill up the end play.
http://www.schnorr.de/en/germany/pro...disc-spring-k/

More info:
http://www.schnorr.de/uploads/media/handbuch_en.pdf
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Old 06-23-2010, 03:49 PM   #2
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These type of springs are also known as 'Belleville' springs.
We use them in formula cars in the front anti rollbar to change the stiffness.
The possibilities are hugh because you can change stiffness by changing the orientation of the rings or by changing the amount of preload.
I think it is defiantly worth to test it.

If you could get the proper size, let me know I think I want to try them aswell.
It should be a direct fit if you would use 4-5 rings depending the orientation.

<<>> This would be a stiff setting.
<><> This would be a soft setting.
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Old 06-23-2010, 04:00 PM   #3
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The last link has also a catalog inside, I believe the size of the flywheel nut is 10mm and they have rings in 10.2 x 20 in several thickness.

I think I will call the large hardware store "the brothers Kruyt" in Leiderdorp to see if they have them.
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Old 06-23-2010, 04:16 PM   #4
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Quote:
Originally Posted by Roelof View Post
The last link has also a catalog inside, I believe the size of the flywheel nut is 10mm and they have rings in 10.2 x 20 in several thickness.

I think I will call the large hardware store "the brothers Kruyt" in Leiderdorp to see if they have them.
I have use them before in different applications, they are neat and can be used with different thickness shims to add preload too. The only thing is i had a few of them flatten out and loose their springiness over time. These were only about .015'' thick. I think it is great for a centax.
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Old 06-23-2010, 09:12 PM   #5
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I definitely think it's worth experimenting with. Could work brilliantly.
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Old 06-23-2010, 11:17 PM   #6
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I've been runninf these belleville washer for most of last season and this one.

This setup is very consistant and easy to adjust.

We run twelve washers, always back to back and nose to nose like this:
)()()()()(

I am using the red shoe and a bell gap of 0.6mm.

The German Serpent Importer sells them as a kit.
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Old 06-24-2010, 02:38 AM   #7
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Quote:
Originally Posted by stefan View Post
The German Serpent Importer sells them as a kit.
I did go to the site of 2-speed but could not find them.
With google I did find this:
http://www.rctek.com/cars/pb/dart/mo...de_clutch.html
http://www.rctek.com/technical/fixin...e_washers.html
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Old 06-24-2010, 10:45 AM   #8
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Quote:
Originally Posted by Roelof View Post
I did go to the site of 2-speed but could not find them.
With google I did find this:
http://www.rctek.com/cars/pb/dart/mo...de_clutch.html
http://www.rctek.com/technical/fixin...e_washers.html
Yep, there web site is ancient :-)

If you really want to try this setup, I can order this washer setup for you.
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Old 06-24-2010, 10:56 AM   #9
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Stefan, thanx for the offer but I have already found many producers in Holland and my sponsor is operating in this world so it shouldn't be a problemto order some examples.

But I like to know the dimensions of the ones you have. So far I can tell I need the 10.2 x 20mm but there are to many different thickness to get.

http://www.amatec.nl/?p=webshop&pg=schotelveren_a
(11 cent a piece.....)

http://www.lesjofors.nl/

http://www.alcomex.nl/Schotelveren_2...0NL-2005-5.pdf

http://www.multicomponents.nl/schotelveren.php

http://www.despiraal.nl/cms/producten/schotelveren/

http://www.mubea.nl/

http://www.roveron.nl/veren/schotelveren

By the way, never thought there was a bigscale Centax clutch, I did send the link to a friend who is busy with a bigscale project.
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Old 06-25-2010, 09:26 AM   #10
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I also want to experiment with a broken down spring and a O ring. When the springs reaches its limit the O ring can go a little further. Its just a thought now though.
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Old 06-26-2010, 12:33 AM   #11
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It's available here now:

http://www.smg-speedshop.de/shop/mai...&items_id=2864
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Old 06-26-2010, 04:36 AM   #12
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Quote:
Originally Posted by stefan View Post
Thanx, it looks good and a reasonable price. Do you know which thickness is used?

I am currently running the Orion square spring. Athough it is still running great it seems it is loosing strength already from the beginning.
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Old 06-26-2010, 10:40 AM   #13
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Quote:
Originally Posted by Roelof View Post
Thanx, it looks good and a reasonable price. Do you know which thickness is used?

I am currently running the Orion square spring. Athough it is still running great it seems it is loosing strength already from the beginning.
Hi Roelof,

these belleville washers are (unfortunately) not available in the correct size.
The have to be machined to fit into our clutches.
I have, like you, searched the net for the right size washers, they are not available.
If they were standard size, I would not offer them in my shop for that prize.

Also, they are stacked in different thicknesses.
2-Speed put a lot of thought into this.
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Old 06-26-2010, 11:57 AM   #14
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Clear talk. I will do some messurements and see what is needed. Probebly I will order a set to give it a try.

As mentioned my sponsor is in the world of metal, he has a small machine factory and all kind of contacts so he can arrange to make standard rings to the right size of maybe he can let them made on the right size.

Funny to see that this seems to work very good and no RC car manufacturer is making it except that 5th scale thing where regarding RCTEK says a normal spring works better.
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Old 07-01-2010, 12:09 PM   #15
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Roelof,

Joey (and others) tested it

He (they) did not notice any difference or any improvement in laptimes, tuning takes a bit more time...

At the end we ditched it, reason? ... Too expencive compared to a simple spring.
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