Why can't the universal coupling be used for the connection between the dynamometer and the engine?

The connection between the power machine and the engine * suitableCouplingIt is not a universal coupling, but a highly flexible coupling.
Universal joint couplings and high-elastic couplings belong to the category of flexible couplings. Universal joint couplings do not have elastic elements, so they cannot have cushioning and shock absorption like elastic couplings to improve transmission. The function of the system's operating characteristics.We all know that the engine has relatively large vibrations and shocks (especially diesel engines and single-cylinder engines). Although the universal joint can also compensate for the relative offset of the two shafts connected to different degrees, it is not effective. Relieve the vibration and impact from the engine.
Of course, it is not to say that the universal coupling is completely incapable of connecting the dynamometer and the engine. It is still sufficient in the engine test with less vibration, and the universal coupling can also be connected to two different axes under certain conditions. Shaft, and to ensure the synchronous rotation of the two shafts.

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