Katalog - Technische Federn von Schweizer Federntechnik

Shear taui in N/mm2
Calculation base tension springs
Formula
symbol
Unit Name
Formula
symbol
Unit Name
d mm Wire diameter n Active coil number
D mm Mean coil diameter nt Total coil number
De mm Outer coil diameter R N/mm Spring rate
Dh mm Bush diameter Fo N Initial tension
Lo mm Unstressed length F1 N Pre-stressed force
Lk mm Body length F2 N Stressed force
Lh mm Loop height Fn N Max spring force
m mm Loop opening width � 1 N/mm2 Shear with F1
L1 mm Pre-stressed length � 2 N/mm2 Shear with F2
L2 mm Stressed length � n N/mm2 Shear with Fn
Ln mm Max stressed length � zul N/mm2 Permitted shear
s1 mm Pre-stressed spring deflection
s2 mm Stressed spring deflection
sn mm Max stressed spring deflection
Calculation formula
Wire diameter
Spring deflection
Number of
spring coils
Body length
3 d � (8�Fn�D) / ( ���zul) 8 D ³
s � � �n �(F �F0
)
G 4
d
n
G d4 � s
� �
8 D³ � (F -F0 )
L k = (n � d ) + 1
Wire diameter in mm
Lh d m
Federrate Spring rate
mit with Vorspannkraft
initial tension
Federrate Spring rate
ohne without Vorspannkraft
initial tension
Innere Initial tension Vorspannung
Federkraft Spring force
Lo
Federungsarbeit
Springing
Schubspannung
Shear
statisch static
Ln
Fo
R G d4 �F
F�F0 � � � �
8 D³ �n �s
s
R G d4 �F
F
� � � �
8 D³ �n �s
s
F0 (F s) R (F G d4 � s
� � � � � ) �
8 D3 �n
F G d4 s
8 D³ n F0
� � � �
W 1
� �( F+F0) �s
2
8 D
� � � �
� d³ F+F0 ( )
De
sn
Fn
15