First be clear what we design is there any requirement of the
spring, by assembling parts we want to make sure our spring should be what kind of structure, the outer diameter or inner diameter size, work schedule, load and working environment.
1, spring wire diameter d: manufacture of spring steel wire diameter.
2, spring diameter D2: the largest outer diameter of the spring.
3, spring diameter D1: the minimum outer diameter of the spring.
4, in the spring diameter D: average diameter of the spring.
Their calculation formula is: D = (
D2 + D1)
Present 2 + d = = D1 D2 - d
5, t: in addition to the support ring, spring adjacent two laps corresponding points on the pitch diameter of the axial distance become pitch, represented by t.
6, effective number of turns n: spring can keep the same number of the pitch circle.
7, support ring number n2: in order to make the spring force uniform at work, guarantee the axis vertical face, manufacturing, often will springs at both ends and tight.
And tight turns only support role, referred to as the support ring.
Generally speaking, there are 1.
5 t、2 t 2。
5 t, commonly used is 2 t.
8, the total number of ring n1: effective number of turns and with the support ring.
The n1 = n + n2.
9, high free H0: spring under the external force is not high.
Calculated by the next type: H0 = nt + (
n2-
0.
5)
d = nt + 1。
5d(
(n = 2)
10, spring spread length L: the length of the wire winding spring when need.
L≈n1 (
ЛD2）
2 + n2 (
Compression spring)
L = Л D2n plus hook length (
Tension spring)
11, spiral direction: has the branch of spin around, common right, drawing didn't indicate the general with the right hand.
12, spring to rotate ratio: the ratio of the diameter D and wire diameter D.
character meaning
c = spring diameter ratio (
c = D / D;
c = D / b)
(
-
]
b = line width [
Units: mm, in]
d = [line diameter
Units: mm, in]
D = diameter center [
Units: mm, in]
F = the spring load [
Unit: N, lb]
G = [shear elastic modulus
Unit: MPa, psi]
high [h = line
Units: mm, in]
k = [spring coefficient
Unit: N/mm, lb/in]
Ks = curve correction factor [
-
]
L0 = free length [
Units: mm, in]
LS = [solid height
Units: mm, in]
effective laps [n =
- - - - - -
]
P = pitch [
Units: mm, in]
s = [the deformation
Units: mm, in]
Ø = t [shape coefficient
- - - - - -
]
(
e.
g。
DIN 2090)
t = spring, torsion stress [
Unit: MPa, psi]
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