The purpose of adopting the snake spring coupling in the mechanical system is to allow it to withstand the misalignment during operation, so the half coupling should be mainly subjected to the following forces and moments during operation.Under the action of torque, the coil spring acts on the compression stress of the half coupling; because it is a high-speed coil spring coupling, the half coupling will generate a large centrifugal force.

　　Under the action of torque, the shear force of the serpentine spring acting on the tooth root of the half coupling; the radial and tangential force during rotation; the bending moment during angular deviation, etc.During operation, the stress caused by the first three forces belongs to the category of static force, and the stress caused by the last two forces belongs to the category of dynamic force, and changes with each revolution of the shaft.

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