Analysis of force on wheel and operation of snake spring coupling

The use or selection of snake spring coupling is to rely on the force to determine, because its force is different, so the size of the model is different, generally in order to optimize the use efficiency of the coupling transmission parts, establish a mechanical model, analyze the role of various forces and moments, so as to achieve the main stress point. Optimize and design all kinds of couplings to achieve better results. In order to establish the mechanical model of half coupling, it is assumed that the snake spring is still in contact with the teeth after deformation, and each tooth has the same force.

The cross section size of the snake spring coupling is much smaller than the radius of the cylinder where it is located, so it is approximate to the plane problem to calculate. The purpose of adopting the coupling transmission part in the mechanical system is to make it withstand all kinds of misalignment in operation, so the semi-coupling in the operation process should be mainly affected by the following forces and torques. Under the action of torque, the snake spring acts on the extrusion stress of the half coupling; Because it is a high speed snake spring coupling, the half coupling will produce a great centrifugal force; Under the action of torque, the shear force of the snake spring acting on the root of the half coupling; Radial and tangential forces during rotation; The bending moment and so on. In the operation process, 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 rotation of the shaft. During the analysis, it is found that the main stress in the upper set of the half coupling is generated by centrifugal force, extrusion force and shear force at the root of the tooth, so the following analysis mainly analyzes these three forces. The model is simplified into a combination of spur gear and snake spring. When the force analysis is carried out, under the action of torque, the tooth side of the half coupling will be subjected to extrusion stress, and the root of the tooth will be subjected to shear force.

Snake spring coupling is actually a kind of mechanical transmission parts, machinery manufacturers in the recent continuous innovation of research methods of mechanical transmission parts, but mainly focused on the coupling transmission parts optimization design, dynamic analysis, reliability analysis and other aspects. The snake spring coupling has the compensation performance and the buffering and reducing excitation, so the high-speed shaft with frequent startup and positive and negative changes is more used the latter. However, in the transmission of torque, due to the strength of the elastic element, the coupling of the elastic element is not as good as the former.