The material of the coupling is: 45 steel, 40CrMo, stainless steel, cast steel, cast iron, aluminum alloy, etc. Coupling is also called coupling. Mechanical components used to firmly couple the driving and driven shafts in different mechanisms to rotate together and transmit motion and torque. Sometimes it is also used to connect shafts with other parts (such as gears, pulleys, etc.). It is often composed of two halves, which are respectively connected with keys or tight fits, fastened to the two shaft ends, and then the two halves are connected in some way. The coupling can be used to compensate the offset (including axial offset, radial offset, angular offset or comprehensive offset) between the two shafts due to inaccurate manufacturing and installation, deformation during work or thermal expansion, and to alleviate impact and absorb vibration. Extended data: according to different working conditions, the coupling should have the following performance:

1. Transportability. The displaceability of the coupling refers to the ability to compensate for the relative displacement of the two rotating members. The manufacturing and installation errors between the connected components, temperature changes in operation and load deformation and other factors, all put forward requirements for mobility. The displaceable property compensates for or relieves additional loads between shafts, bearings, couplings and other components due to relative displacement between rotating members.

2, buffer. For the occasion of frequent load starting or working load change, the coupling should have elastic elements that play the role of buffer and vibration reduction to protect the prime mover and working machine from damage. The advantages of the coupling: the coupling sometimes also has the function of overload safety protection. The coupling belongs to the category of mechanical general parts, which is used to connect two shafts (driving shaft and driven shaft) in different mechanisms to make them rotate together to transmit torque. In high-speed and heavy-duty power transmission, some couplings also have the functions of buffering, damping and improving the dynamic performance of the shaft system. The coupling consists of two halves, which are respectively connected with the driving shaft and the driven shaft. The general power machine is mostly connected with the working machine by means of a coupler, which is a commonly used connecting part for the transmission of mechanical products. 1. It has high elasticity (low stiffness, large flexibility), the rotation angle is 10 degrees when it is subjected to nominal torque, and 25 degrees when it is subjected to high torque, which can reduce the natural vibration frequency of the shafting system and change the torsional vibration characteristics of the diesel engine power unit. The diesel engine does not have dangerous resonance speed within the required speed range. 2. It has good damping and vibration reduction characteristics, which can absorb part of the vibration energy, reduce the vibration amplitude when passing through the vibration point, and reduce the torsional vibration stress of the shaft section.

3. It can absorb and reduce the fluctuation of the output torque of the diesel engine. For the diesel engine power unit equipped with a reduction gearbox, it can reduce the knock on the gear surface during the torque change and extend the service life of the gear.

4. It can compensate the axis offset. It not only has high elasticity in torsion, but also has elasticity in axial, radial and angular directions. It is easier to center during installation and can compensate the error caused by the deformation of the hull and base after installation. Ensure the normal operation of the diesel engine and shafting.

5. It can realize vibration reduction and isolation of solid sound and insulation current. After the diesel engine is equipped with a vibration damping base, relative vibration occurs between it and the shafting. Only when an elastic ring coupler with elasticity in the axial, radial and angular directions is installed, can the vibration damping base be installed under the main engine, and at the same time, solid sound can be isolated and noise can be reduced. Since the elastic ring coupling is made of natural rubber components, the insulation performance is good, and the axial current can be prevented.