KTR couplings increase life of water jet drives
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KTR Couplings product story
Edited by the Engineeringtalk editorial team
May 27, 2009
KTR is offering marine couplings for main and auxiliary drives and every kind of deck equipment, such as ballast pumps, cranes and winches.
Speedboats, life-boats, ferries and customs boats are among the growing number of vessels using water jet drives.
The double-cardanic, torsionally stiff Radex-N Composite coupling, which compensates for high displacements with low restoring forces, is suitable for transmitting torque in these drives.
The driving shaft and impellor are connected by a CFK spacer that accepts larger shaft dimensions than usual steel tubes, while being lighter, accepting higher loads and being maintenance-free.
The majority of freight and passenger vessels and a growing number of yachts are equipped with bow thrusters or transverse rudders for better manoeuvrability in harbours.
These applications require couplings that dampen torsional vibrations, such as the flexible Rotex coupling, which is mounted between the motor and gearbox.
Its compact design makes it easy to assemble, disassemble and operate.
It is completely maintenance-free.
The coupling compensates for axial, radial and angular displacements, increasing the service life of the entire drive system.
It is becoming common for tug boats and other vessels to be fitted with Azimuth drive systems.
The Azimuth drive is mounted on bearings, enabling the entire propeller unit to swivel, providing extraordinary manoeuvrability.
The combination of the Rotex coupling with the KTR-SI overload system on these applications protects the gearbox of the propeller unit against high torque shocks.
This increases the service life of the drive system, especially if the steering unit collides with the seabed when the vessel is manoeuvring in shallow waters.
Clampex clamping sets were developed by KTR for high loads, high alternating torques and high torsional forces, helping to keep ships on course.
The shaft-hub connection was designed for shaft diameters of up to 400mm and can transmit much higher torques and axial forces than a positive-locking connection; at sea up to 500,000Nm and on industrial and land applications even more.
On winches and cranes and numerous electric power packs, Rotex couplings are used for their powerful torque transmission and safety features.
Hydraulic power packs in combination with diesel engines use Bowex-Elastic and Bowex FLE-PA flange couplings, which can both be plugged in axially, making them easy to disassemble.
KTR offers a large range of couplings for pumps used on marine vessels, such as the torsionally flexible jaw couplings Rotex and Poly-Norm or the torsionally stiff steel lamina couplings Radex-N and Rigiflex-N.
The couplings on marine compressors should be compact and have a high resistance to various substances and temperatures.
Here, the flexible Rotex or the flexible flange couplings Bowex-Elastic are good options.
The combination of a powerful marine generator and a fail-safe coupling removes the need for a separate power source.
Rotex and Bowex-Elastic are compact and flexible and can transmit high torques and dampen vibrations.
The couplings are certified to Germanischer Lloyd and the American Bureau of Shipping, allowing them to be used in shipbuilding throughout the world.
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