Diaphragm Coupling

A diaphragm coupling is a high-performance flexible coupling that uses a metal diaphragm as its core elastic element. It is mainly used to connect two shaft systems and achieve torque transmission while compensating for axial, angular, and radial displacements. Its key characteristic lies in the elastic deformation of the metal diaphragm during torsion, which absorbs the relative displacement of the shaft system caused by installation errors, thermal expansion, or operational vibration, thereby preventing impact loads from being directly transmitted to critical components such as motors and gear reducers. Compared with traditional gear couplings or rigid couplings, diaphragm couplings require no lubrication and have no gear surface wear issues. They offer high transmission efficiency and longer service life, making them particularly suitable for transmission systems under harsh conditions such as high temperature, high speed, and corrosive environments.
Diaphragm couplings are compact in structure, lightweight, and have high torque carrying capacity, making them especially suitable for applications requiring precise positioning or being sensitive to rotational backlash. Because they use metal diaphragms as flexible elements, they can maintain stable elastic properties over a wide temperature range, and are therefore widely used in industries such as metallurgy, chemical, power generation, marine, compressors, and fans. Diaphragm couplings are usually divided into multiple series and models to adapt to different transmission distances, shaft diameter combinations, and installation space requirements. Among them, the JMI, JMIJ, JMII, and JMIIJ series cover a wide range of application scenarios from short-distance precision transmission to long-distance heavy-duty transmission through differentiated design in diaphragm structure form, connection method, installation length, and other aspects, providing flexible and reliable selection solutions for industrial transmission systems.