Keyway type diaphragm stepped coupling

Structural features

Diaphragm part

1. The diaphragm is designed in a stepped style. This design allows the diaphragm to disperse stress more effectively when transmitting torque. Compared with ordinary diaphragms, different steps of the stepped diaphragm can withstand the stress generated by axial, radial and angular displacement compensation to varying degrees. For example, when there is a certain axial displacement between the two shafts connected by the coupling, different areas of the stepped diaphragm can play a buffering and compensating role according to the size of the displacement, reducing the situation where stress is concentrated in a certain part.

2. The keyway design is mainly used for connection with the shaft. The keyway can ensure that the connection between the coupling and the shaft is tight and there will be no relative sliding when transmitting torque. The keyway has high dimensional accuracy requirements, and the width, depth and other parameters of the keyway are usually determined according to the diameter of the connected shaft and the torque required to be transmitted. Generally, standard keyway specifications are used, such as the flat keyway, which is rectangular in shape and can fit tightly with the flat key to ensure effective transmission of power.

Material properties

Diaphragm material

1. The diaphragm is usually made of high-strength stainless steel, such as 304 stainless steel or 316 stainless steel. 304 stainless steel has good corrosion resistance and can prevent rust in general working environments, ensuring the service life of the coupling. 316 stainless steel contains molybdenum, which has stronger corrosion resistance, especially in environments containing corrosive media such as chloride ions, such as coupling applications in marine engineering equipment. 316 stainless steel diaphragms can better resist corrosion. These stainless steel materials also have a high elastic modulus, which can produce appropriate elastic deformation when subjected to torque and displacement compensation, and can return to their original state after deformation, ensuring the performance stability of the coupling.

Coupling half material

1. The half coupling is generally made of high-quality carbon steel or alloy steel. High-quality carbon steel, such as 45 steel, has high strength and toughness and can withstand large torque. After appropriate heat treatment, such as quenching and tempering, the comprehensive mechanical properties of the 45 steel half coupling can be further improved. Alloy steel, such as 40Cr, contains alloy elements such as chromium, and has better strength and wear resistance than carbon steel. It is suitable for Couplings under high-speed and heavy-load conditions, and can effectively prevent the half coupling from wearing and deforming during long-term operation.