Compression Spring Shear Spring Rate
Compression Spring Shear Spring Rate
(OP)
Hola Forum,
Does anyone have a formula to derive the shear spring rate of a compression spring? In other words, the spring rate in the plane perpendicular to the axis of the spring.
I've seen this provided from a German spring manufacturer (that I can no longer get a hold of) as a function of in-axis deflection.
It doesn't need to be exact, just trying to determine feasability. Rough dimensions: O.D. = 8", Wire Dia. = 1" Free Length = 9", Travel = 3", Mat'l = Alloy Steel
Gracias,
Andrew
Does anyone have a formula to derive the shear spring rate of a compression spring? In other words, the spring rate in the plane perpendicular to the axis of the spring.
I've seen this provided from a German spring manufacturer (that I can no longer get a hold of) as a function of in-axis deflection.
It doesn't need to be exact, just trying to determine feasability. Rough dimensions: O.D. = 8", Wire Dia. = 1" Free Length = 9", Travel = 3", Mat'l = Alloy Steel
Gracias,
Andrew





RE: Compression Spring Shear Spring Rate
Kx = 10^6*d^4/(Cl*n*D*(0.204Hs^2 + 0.265*D^2)
Kx= lateral stiffness of spring
Cl= factor depending on vertical deflection due to load divided by the spring free length and the free length divided by the mean diameter of spring
n= number of active coils
Hs= compressed length of spring
D= mean dia of spring
d= wire dia of spring
Can you give me the rate of your spring and the number of active turns and I'll get the Cl factor for you.
regards
desertfox
RE: Compression Spring Shear Spring Rate
I'm still in the very early stages of design, but the spring rate will be around 5000 lb/in. Do you know the approx range of the Cl factor?
Andrew
RE: Compression Spring Shear Spring Rate
desertfox
RE: Compression Spring Shear Spring Rate
spring rate for compression spring derived formula is as
follows
Kx=G*d^4/8D^3n
Design follows iterative process intitally assuming wire dia & Spring index w.r.to space requirement & load requirement.
Hope it will help you
desertfox..Do u have derivation for the formula
John
RE: Compression Spring Shear Spring Rate
The op hasn't been in for over a week I assume he got the last part of the answer somewhere else.
In addition I think you misinterpreted the post he wanted the spring rate at 90 degrees to the normal axis of spring.
Regards
desertfox
RE: Compression Spring Shear Spring Rate
Sorry I've been away from work for a while, but I would still very much appreciate the Cl factor for the lateral spring rate. I haven't correctly sized the springs yet as I am new to suspension design therefore I cannot provide exact parameters. However, the application is rail so the springs will be pretty beefy. Inner and Outer spring combined stiffness of 10,000 to 15,000 lb/in. Can you please provide an approximate range for Cl? Possibly as a function of Vertical deflection?
RE: Compression Spring Shear Spring Rate
RE: Compression Spring Shear Spring Rate
Mechanical Springs, by A. M. Wahl 1963 pages 282-284 Chap. 24-4 Combined axial and lateral loading.