Factor to consider when choosing a coupling: Mechanical Characteristics of the driving machine

Between the power machine and the working machine, the main and driven ends are connected by one or several couplings of different varieties or different types and specifications to form a shafting transmission system. In mechanical transmission, the power machine is just like the electric motor, internal combustion engine and steam turbine. Due to the different working principle and structure of the power machine, its mechanical characteristics vary greatly, and some operations are stable, and some have impacts during operation, which have unequal effects on the transmission system. According to the mechanical characteristics of the power machine, the power machine is divided into electric motors and turbines, four-cylinder and above four-cylinder internal combustion engines, two-cylinder internal combustion engines, and single-cylinder internal combustion engines.

The mechanical characteristics of the power machine have a certain impact on the entire transmission system. Due to the different mechanical characteristics of different types of power machines, the corresponding power machine coefficient Kw should be selected to select the best coupling suitable for the system. The type of power machine is the basic factor for selecting the type of coupling; the power of the power machine is one of the main basis for determining the size of the coupling, which is proportional to the torque of the coupling.

Most of the power machines in the transmission system of fixed mechanical products are electric motors, and the power machines in the transmission system of running mechanical products (such as ships and various vehicles) are mostly internal combustion engines. When the power machine is an internal combustion engine with different number of cylinders, the torsional vibration must be considered. The influence of the transmission system is related to the number of cylinders of the internal combustion engine and whether each cylinder is working normally. At this time, the elastic coupling should generally be selected to adjust the natural frequency of the shaft system, reduce the torsional vibration amplitude, thereby damping, buffering, protecting the transmission device components, improving the alignment performance, and increasing the stability of the output power.