Coupling is an important part of the mechanical transmission system. It is often used to connect two shafts or shafts and rotating parts to transmit torque and motion. It is widely used in metallurgy, chemical industry, machinery, vehicles and ships, electronics, aircraft and other industrial parts.Couplings are generally divided into metal elastic elements. Flexible couplings have the following main features:

　　1. The elastic element has higher strength, smaller volume and compact structure than other couplings that transmit the same torque.

　　2. Stable performance and long service life

　　3. The manufacturing is more complicated and the cost is higher

　　Metal elastic elements are mostly diaphragms, bellows, connecting rods, etc.Metal elastic element couplings are widely used in:

　　1. Pumps and fans with higher power and higher speed

　　2. A crushing machine with large impact torque and drastic load changes

　　3. Precision transmission machinery, data transmission system.

　　4. Where high temperature and high precision transmission are required.