Belleville Springs and Washers FAQ - Solon Manufacturing Co.

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If you want to learn more, please visit our website HEGONG SPRING.

If you want to learn more, please visit our website Belleville Spring Washers.

Want more information on ring springs? Feel free to contact us.

Just how do you propose getting several feet of deflection from a belleville washer 3.5 inches in diameter? You are going to have to stack up dozens of them inside a tube or over a rod. You could do the same with a coil spring to control the buckling. Either one is going to have a pretty large amount of friction (energy loss) which is not going to help your "infinite fatigue life" criteria. What is your actual life requirement? Typical S/N curves only go out to about 10^7, that is a long way short of infinite. I've had springs break at 10^8 when my requirement was 10^9. Simply keeping stress below the "fatigue limit" won't get you to "infinite life".

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
Caddelljoey

Energy loss is the same as dissipating energy through heat, friction etc.

Why not tell us exactly what your trying to do in a single post instead of dribbling information over several posts.

Here is a link to belville washers technical handbook


In it you will find towards the end the frictional losses for spring stacks which will be in the order of 2,5,15% of the spring force, however you haven't provided any load information about either a coil spring or a belville spring stack other than diameter, spring life, what about spring stiffness or load at length because it's these parameters that will govern the energy losses that you require.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein Buy a couple dozen Bellevilles and see how high you can stack them on your desk, like a high tech Jenga.
I'm betting the pile will fall over before you run out.
Note also that the inner and outer edges are both rough, so while it is possible to guide them, there will be uncertain friction against the guides.
You might be better off stacking closed and ground coil springs, which at least give you a finite radius on the rubbing surface.

You could also make one really long spring with square-ish coils from a long piece of hollow bar, given a really long lathe and a milling spindle on the slide, or maybe use a wire saw on the slide and make it look like a very long Heli-Cal. ... but cutting springs from hollow bar is normally done for very high force within a limited envelope, not for very high stroke within a limited envelope.
... but no matter how nicely you make it and how perfectly square the ends are, it will still buckle, and need guidance.
Maybe you could line the outer tube with plastic, if you can find one that will take your downhole temperatures.

As israelkk said, providing some more of the spring parameters you actually need would help us eliminate some of the most inappropriate possibilites.

How much 'idle length' do you have available? Could you, for instance, use an extension spring that's ten feet long, plus a two foot stroke, making your assembly's OAL approx 12 feet?



Mike Halloran
Pembroke Pines, FL, USA