Serpentine coupling repair

The main structure of the serpentine spring coupling is composed of two half couplings, two half outer covers, two sealing rings and serpentine spring sheets. It transfers torque by embedding the serpentine spring into the tooth grooves of the two coupling halves, and the coupling uses serpentine springs to be embedded in the tooth grooves of the two coupling halves to realize the link between the driving shaft and the driven shaft. During operation, the driven end is driven by the axial force of the active end tooth facing the coil spring to transmit torque, which largely avoids the occurrence of resonance and the elastic variable produced by the reed when transmitting torque. , So that the mechanical system can obtain a better damping effect, with an average damping rate of over 36%.

How to analyze the tooth profile of the serpentine spring coupling is straight or curved? The serpentine spring coupling uses serpentine springs divided into one or several groups and is embedded between the teeth on the flange of the two-part coupling In order to realize the connection of the two halves of the coupling, in order to prevent the serpentine spring from being thrown out under the action of centrifugal force and to avoid dry friction between the serpentine spring and the tooth contact, it needs to be covered with a closed shell and filled with Oil or grease. The serpentine spring coupling is divided into two types of transverse stiffness and variable stiffness, which mainly depend on the following two shapes of the teeth in contact with the spring:

The tooth profile of the serpentine spring coupling is linear: under normal load, the distance between the serpentine spring and the tooth contact point does not change with the deformation of the serpentine spring, and the stiffness remains unchanged. The two halves of the coupling are relative to each other. The rotation angle has a linear relationship with the transmitted torque, which is a constant-rigidity serpentine spring coupling.

The serpentine spring coupling tooth type is curvilinear: when the load is small, the straight part of the serpentine spring is basically parallel to the axis to be connected; when the load increases, the deformation of the serpentine spring increases, and the arc of contact with the tooth is also Increase, and the distance between the contact point with the tooth becomes shorter and shorter, the stiffness increases, the relative rotation angle of the two halves of the coupling and the transmitted torque are non-linear, which belongs to the variable stiffness serpentine spring coupling. The linear tooth profile is easy to process and low in cost, but it is only suitable for working conditions with small changes in the transmission torque. Curved tooth couplings are suitable for large torque changes and positive and negative working conditions, and have a good cushioning effect, but the curved tooth shape has poor manufacturability and high manufacturing costs.