A coupling is a mechanical part that connects two shafts of different mechanisms, the driving shaft and the driven shaft, so that they rotate together to achieve torque transmission without backlash. The power machine is generally connected to the working machine with the help of a coupling. The two shafts cannot be separated when the machine is running. Only after the machine is parked and the connection is disassembled, the two shafts can be separated. In high-speed and heavy-load power transmission, some couplings also have the functions of buffering, vibration reduction and improving the dynamic performance of the shaft system.There are many types of couplings, which can be divided into two categories based on whether they contain elastic components inside: rigid couplings and flexible couplings.

1.Rigid coupling

A rigid coupling is a mechanical component used to connect two axes, which does not have elastic elements and therefore cannot absorb vibrations or compensate for axial, radial, and angular displacements.The main characteristics of rigid couplings are simple structure, low manufacturing cost, easy assembly and disassembly, and the ability to ensure high alignment accuracy between the two shafts. They are suitable for situations that require precise alignment and do not withstand significant displacement. Here are some common types of rigid couplings:Flange Coupling，Sleeve Coupling，Clamp Coupling and Rigid Pin Coupling.

2.Flexible coupling

Flexible coupling is a connection device that can effectively compensate for shaft deviation, reduce vibration, and absorb impact, and is suitable for improving the reliability of mechanical transmission systems.

Mechanically Flexible coupling: Gear couplings,Chain couplings,Grid couplings,etc.

Elastomeric Element flexible coupling: Urethane Tire Couplings, Jaw couplings, Sliding couplings, Pin ahd bush couplings,etc.

Metallic Element flexible coupling: Disc couplings.

Couplings are widely used in mechanical manufacturing industry, heavy industry and mining, wind power generation, chemical and fluid processing, ship and port equipment, pulp and paper industry, steel, water treatment, fertilizers, oil and gas and other fields. Its high performance, reliability, and adaptability make it the preferred transmission solution for various industrial equipment.

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