Selecting springs
Equations used for
compression springs:
1.
work/application
1 W = · F · s
2
2.
load
G d
4
· s
F = ·
8 D
3
· n
3.
deflection
8 D
3
· n
s = ·
· F
G d
4
4.
springrate
G d
4
R = ·
8 D
3
· n
5.
shear strain
8 D
τ
= ·
· F
π
d
3
G d
τ
= ·
· s
π
n · D
2
dynamic
τ
k
= k ·
τ
6.
diameter of wire
3
8 F · D
d =
√
·
π τ
zul
7.
number of
active
coils
G d
4
· s
n = ·
8 D
3
· F
8.
total number
of
coils
n
t
= n
+
2
9.
minimum
distance
between
the
active coils
D
2
s
a
= (0,0015 ·
+
0,1 · d) · n
d
10.
deflection of the spring
G1
−
0,5
E
(
π
· D
)
2
s
k
= L
0
·
·
|
1
−
√
1
−
·
|
G
G v · L
0
1
−
0,5
+
E
E
12.1
to buckling
shear strain Tizul in N/mm²
KL SH
permitted shear strain
τ
izul for compression
springs according to no. 1.4310
permitted shear strain
τ
izul for compression
springs according to EN 10270-1
KL DH
wire diameter d in mm
