The structure of the diaphragm coupling

　　Due to manufacturing and installation errors, load-bearing deformation, thermal deformation, and sinking of the machine base, the two shafts connected by the coupling will have axial, angular, and radial deviations between the axes.This will cause additional loads on the shafts, bearings and couplings, and worsen the working conditions of the ship's propulsion shafting.The use of diaphragm couplings can greatly reduce the impact of additional loads and improve the working conditions of the ship's propulsion shafting.
　　Diaphragm couplings are widely used in ship propulsion shafting, especially for high-speed boat propulsion shafting. The diaphragm is a key component of the diaphragm coupling. In order to meet the reliable operation requirements of the ship’s high-speed shafting, the diaphragm Perform stress analysis and strength calculations.According to the structure and working characteristics of the diaphragm coupling, the force analysis of the diaphragm is carried out for the common six-hole diaphragm in engineering design, and an example calculation is carried out with MSC.Patran finite element software.
　　Diaphragm coupling is an all-metal dry flexible coupling, which is mainly composed of left and right half couplings, diaphragm sets and connecting bolts.Among them, the diaphragm group is formed by stacking a number of high-strength stainless steel coated diaphragms, which are alternately fixed to the driving end and the driven end by bolts.In order to obtain good compensation performance, an intermediate shaft is often used, with a set of diaphragm groups at each end of the double diaphragm coupling, which are respectively connected with the driving and driven shafts.Its working principle is: the torque is input from the left half of the coupling, and is transmitted to the diaphragm group through the active high-strength bolt, the diaphragm group then transmits the torque to the intermediate shaft through the driven high-strength bolt, and the same torque passes through the other end The output of the diaphragm set, high-strength bolt and right half coupling.
　　The diaphragm coupling can absorb or relieve the three-way offset between the axes through the flexibility of the diaphragm, and improve the working conditions of the ship's propulsion shafting.It has the advantages of large transmission torque, simple structure, convenient disassembly and assembly, reliable work, and no need for lubrication.