Flexible coupling: torsionally soft coupling
230 - 132 000 Nm | CENTAX-V
CENTA
Universal joint shafts are frequently used to transmit the power from a Diesel engine to the driven unit where the driven unit cannot be flange mounted to the engine. Every Diesel engine produces torsional vibration and every universal joint shaft has a certain torsional elasticity. When these two components are connected to a driven machine a system is created which in many cases will generate very high vibratory torques somewhere within the equipment. In other words there will be a resonance speed. At this speed the equipment will be subject to very high alternating torques giving rise to noise and dam-age to working parts leading to premature failure of the system. In resonance the universal joint shaft acts like a spring, which is almost undamped and magnifies the torsional vibration produced by the engine. These oscillating torques can have a value of well over 10 times the output torque of the engine. This problem can be solved by the introduction of a highly flexible intermediate coupling which will provide two advantages for the drive:
1) The torsional elasticity of the intermediate coupling and universal joint shaft combined is so high that the dangerous resonances are shifted below the operating speed of the engine.
2) The flexible intermediate coupling has a high damping capability so that the vibratory torque is reduced to an acceptable level only a short distance away from the resonance speed. Most importantly, the vibratory torque levels while passing through resonance on engine start up will be within acceptable levels.
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