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Calculations of torsion springs

keyword
springdesign
torsionsprings

Question Yoko

Nice to meet you, I found this page while I was falling asleep on the design of a spring.
Currently, we are designing a spring that moves ± 5 mm in the axial direction and also twists. I’m thinking about a torsional spring with a characteristic of 50 Nm/°, but I don’t know if it is possible or not. Of course, I can’t do design calculations, so I’m kinda stuck at this step. Can you calculate something like this?
If possible, please tell me the design calculation method. Thank you.

Answer Tokai Spring

Since the stroke (± 5 mm) in the compression direction of the spring is small, it seems that there is no problem if a sufficient pitch is provided in the coil part.
Regarding the calculation of torsion springs, we will consider it separately if you can tell us the conditions such as the torsion angle and space.
Please feel free to contact us!
In addition, we will attach documents about the calculation formulas, so we would appreciate it if you could refer to it.
Yoko, thank you for your question!

Answer Spring Newbie

Nice to meet you.
There are different types of springs, such as compression, tension, and torsion, and I think the spring constants are also different.
Is it possible to reproduce the spring constant of a compression spring with a torsion spring? I would like to know if there is such a calculation formula.
Thank you.

Answer Tokai Spring

Spring Newbie, thank you for your post!
The type of load differs between the compression springs and the torsion springs. While the load applied to compression springs is vertical, the torsion springs are subjected to torque (moment). [Compression coil spring] Spring constant = ×× N / mm
Evaluation stress = Torsional shear stress load = ×× N

[Torsion coil spring] Spring constant = ×× N / deg (rad)
Evaluation stress = Bending stress load = ×× N

・ If it is a flat spiral spring, there is a mechanism to convert the load into a vertical load.

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