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Torsion springs are mainly used for compression and energy storage in mechanical engineering, and can also be used as elastic links in transmission systems. The cross-section of the material used for torsion spring is mostly circular, followed by rectangular, and there are also elliptical and trapezoidal ones.

Characteristics of torsion springs
Basic geometric parameters and characteristics of torsion springs
The following figure shows the basic geometric parameters and characteristic relationships of torsion springs.
T1, T2, …, Tn are working torques, and the corresponding torsional deformation angles are φ1, φ2, …, φn. Take the test torque that reaches the test stress σs as Ts, and the corresponding torsional deformation angle under the test torque as φs. In order to ensure the torque under the specified torsional deformation angle, T and φ should be between 20% and 80% of the test torque T and the deformation angle φ under the test torque, respectively.

Due to the structural shape of the spring end, the friction between the spring and the guide rod, etc., which affect the characteristics of the spring, no characteristic requirements are specified unless there is a special need. If the spring characteristic requirements are specified, a spring with a gap between the spring coils should be used, and the torque at the specified torsional deformation angle should be used for assessment.

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