Nice to meet you.
This is my first time posting here. I have a problem that the torsion coil spring comes into contact with the guide shaft and breaks due to wear. The spring is Φ1.5 mm, 6 coils, D=17 mm, material SWP. What is the solution for such cases? I would appreciate it if you could let me know.
If the spring is used in the direction of winding, the coil diameter will decrease, so when using it with a guide rod, it is necessary to design in advance for this. The diameter Ds of the guide rod should be about 90% of the inner diameter of the coil at maximum use. The reduction in coil diameter and the diameter of the guide rod can be calculated by the following formula.
ΔD = ΦmaxD / 2πMDs = 0.9 (Di-ΔD)
in which:
Di = Coil inner diameter,
Do= coil outer diameter,
D = Coil mean diameter,
D = (Di + Do) / 2,
ΔD = Reduction of coil mean diameter under load,
Φ = Twist angle of the spring,
M = Twisting moment (torque) on the spring,
Ds = Diameter of the guide rod
