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AT_137583944-Participant
4-Participant
Nov 17, 2025 9:22 AM UTC
Question

Torsion Spring Mechanism Troubleshooting

Hello all,

If anyone has an idea about torsion springs ?

I am trying to apply torsion spring mechanisms to this assembly, but during the process I am unable to pick a reference point; the first point is selected, but the second point is unable to be picked, and the torsion spring is not visible. 

Result of this process I need a calculation against the torsion spring. 

For reference, I attached a screenshot of the extension spring that shows when the reference points are selected and the spring becomes visible.

 

Torsion spring asm.

AT_13758394_1-1763371186027.png

Extension spring example :

AT_13758394_0-1763371125670.png

 

 
 
 

2 replies

Catalina
CatalinaCommunity Manager
Community Moderator
Nov 21, 2025 2:40 PM UTC

Hi @AT_13758394 

Thank you for your question. 

Your post appears well documented but has not yet received any response. I am replying to raise awareness. Hopefully, another community member will be able to help.

Also, feel free to add any additional information you think might be relevant.

 

Best regards,

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Catalina | PTC Community Moderator
    Lewis_Maina_M13-Aquamarine
    13-Aquamarine
    Dec 30, 2025 1:52 PM UTC

    Hello,

    Torsion Springs store energy by twisting which is the Torque which is directly proportional to angular deflection 

    From Hook's law for torsion: T(Torque) = k (Torsional spring rate) x theta (angle of twist)

    In CREO, this is rotational spring element that must be applied on a revolute joint i.e. pin connection

     

    Example below:

    Lewis_Maina_M_0-1767102321975.png

    Grey part - Base ,fixed to the default CS

    Yellow part - Has pin connection , the part will be supported by Torsion spring

    At the center you can see the Torsion spring. Below is the spring configurations after running static analysis to determine spring will deflect by how many degrees

    Lewis_Maina_M_1-1767102499850.png

    I have also created a measure to measure the angle of deflection

    Lewis_Maina_M_2-1767102615197.png

     

    As you change the spring K the value of twist angle changes , gravity must be enabled and mass properties of the parts supported defined

     

    I hope above will give you a starting point of Torsion springs in mechanisms

    For more details please watch this video:

    https://youtu.be/9uD7cfzzf38

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