Torsion springs have at least one and a half coils. A torsion spring is exposed to external forces acting in planes perpendicular to the coiling axis, inducing a torque in the coiling or uncoiling direction. The torque is carried by the working and the supporting arms. Active coils change their diameter during the function.
Dimensions
|
d |
wire diameter [mm, in] |
|
D |
mean spring diameter [mm, in] |
|
D 1 |
outside spring diameter [mm, in] |
|
L 0 |
length of coiled spring part for free spring state, in general [mm, in] |
|
R 1 |
arm of working force induced by the spring [mm, in] |
|
R 2 |
arm of support force induced by the spring [mm, in] |
|
M 1 |
torque induced by the pre loaded spring [Nm, lb ft] |
|
M 8 |
torque induced by the fully loaded spring [Nm, lb ft] |
|
W 8 |
deformation energy induced by the fully loaded spring [J, ft lb] |
|
ϕ 1 |
angle deflection of working arm in the pre loaded state [°] |
|
ϕ 8 |
angle deflection of working arm in the fully loaded state [°] |
|
ϕ h |
angle of working stroke [°] |
|
ρ 0 |
angle of arms in the free state [°] |
|
F |
working force induced on the R1 arm, in general [N, lb] |
Coiling
- Right (usually)
- Left (must be notified in words)
States
- Free: the spring is not loaded (index 0)
- Preloaded: smallest working load is applied to the spring (index 1)
- Fully loaded: maximum working load is applied to the spring (index 8)
- Limit : the spring is deflected to the solid length (index 9)