SWP-D type non retractable short typeUniversal couplingDue to manufacturing and installation errors, deformation after bearing, and temperature changes, the relative positions of the two shafts may change, and strict alignment cannot be guaranteed. Couplings can be divided into rigid couplings, flexible couplings, and safety couplings based on whether they have elastic elements, whether they have the ability to compensate for various relative displacements, whether they can maintain their connection function under relative displacement conditions, and the purpose of the coupling. The main types, characteristics, and role categories of couplings in transmission systems. Note that rigid couplings can only transmit motion and torque and do not have other functions, including flange couplings, sleeve couplings, clamp shell couplings, and other flexible couplings. Flexible couplings without elastic elements not only can transmit motion and torque, but also have varying degrees of axial, radial, and angular compensation performance, including gear couplingsUniversal couplingFlexible couplings with elastic components such as chain couplings, slider couplings, and diaphragm couplings can transmit motion and torque; Has varying degrees of axial, radial, and angular compensation performance; It also has varying degrees of vibration reduction and buffering effects, improving the working performance of the transmission system, including various non-metallic elastic element flexible couplings and metal elastic element flexible couplings. The structures of various elastic couplings are different, and their roles in the transmission system are also different. Safety couplings transmit motion and torque, and provide overload safety protection. Flexible safety couplings also have varying degrees of compensation performance, including pin type, friction type, magnetic powder type, centrifugal type, hydraulic type and other safety couplings.