Couplings belong to the category of mechanical universal components, which are used to connect two shafts (active shaft and passive shaft) in different mechanisms to rotate together and transmit torque. In high-speed and heavy-duty power transmission, some couplings also play a role in buffering, damping, and improving the dynamic performance of the shaft system. The coupling consists of two halves, which are respectively connected to the driving shaft and the driven shaft. Generally, power machines are connected to the working machine through couplings, which are extremely commonly used connecting components for shaft transmission in mechanical products.