Diesel engines, which are mounted seperately from the marine gear, can be placed on rather soft flexible mounts, because then these mounts must not bear the axial thrust of the propeller. These soft mounts provide optimum isolation of the vibrations of the diesel engine from the hull.
In this case, the flexible couplings must be able to dampen the torsional vibrations and to absorb the unavoidable, substantial misalignments, mainly radial misalignment, between the engine and the gear.
For these applications CENTA has developed special, purposely designed flexible couplings:
CENTAX-N and CENTAX-NL for the torque range up to 25 kNm.
Specially for high speed diesel engines with SAE-flywheels in the power range up to about 2500 kW, the CENTAX-series CX-N and CX-NL are a technically and commercially advantageous solution.
This is an economical combination of a torsional and radial flexible CENTAX rubber element with an axial and angular flexible steel membrane or link system. The steel membrane of the CX-N compensates for moderate axial and angular misalignments and the link system of the CX-NL provides outstanding flexibility for substantial misalignments.
In order to achieve good torsional behaviour, the secondary inertia of the coupling has purposely been made large enough, so that the main order of the torsional vibration is usually shifted well below idling speed of the diesel engine. Therefore no gear chatter should occur. If in single cases more inertia should be required, the OD of the output flange and thereby its inertia can easily be increased.
High compensation of misalignment in radial, axial and angular direction with low reaction forces
High torsional flexibility with linear characteristics. Various shore hardnesses result in different torsional stiffness for optimum tuning of the torsionals and for damping of vibration and noise.
High allowable energy loss by intensive inner and outer ventilation.
Economical design and well proven parts produced in series, low weight and favourable connecting dimensions.
Free of maintenance and wear, long life expectancy, easy assembly with radial removal of elements in-situ.
Engine connection dimensions acc. SAE, special flanges are possible.
The driven hubs made of high grade steel with connections for the various gear input shafts are available on short delivery.
Torque range from 1.1 up to 25 kNm at the moment. For higher torques up to 650 kNm we recommend the larger sizes of the CENTAX-SEC series.
Please refer to the CENTAX-SEC main catalog, where detailed explanations of the Technical Data are also available.
Specially for high speed diesel engines with SAE-flywheels in the power range up to about 2500 kW, the CENTAX-series CX-N and CX-NL are a technically and commercially advantageous solution.
