Hydraulic tunnel thrusters need a well-designed hydraulic system for reliable and efficient operation. Very often, only the bow thruster is installed, and this system can only be required for one device. The most common thruster system uses the engine as a power source.
Tunnel thrusters may be installed at the bow of the boat or the stern. They are called tunnel bow thrusters and tunnel stern thrusters, respectively. Retractable thrusters may also be installed at the bow and stern of the boat.
Hydraulic tunnel thrusters need a well-designed hydraulic system for reliable and efficient operation. Very often, only the bow thruster is installed, and this system can only be required for one device. The most common thruster system uses the engine as a power source. This system can offer unlimited running time and does not require batteries or high power cables. Two types of hydraulic pumps may be used for such specialized systems.
Variable displacement pump.
A variable-displacement pump may be used when a fixed flow is required at constantly changing engine speeds. Usually, it is a pump mounted on the main engine or a reduction gear through a power take shaft. These systems are often used on large ships and offer a powerful solution for large thrusters when the bow thruster and stern thruster work together for a long time.
The pumps with fixed displacement.
It is used when a power-recovery generator is available. Fixed-volume pumps yield a fixed flow at a given engine speed. These systems are highly reliable, easy to install and cost-effective.
Special electro-hydraulic powertrains Powerpacks®.
Sometimes it is not possible to install a hydraulic pump actuator on the vessel’s engine. Max Power manufactures several special battery-operated electrical units specifically designed both for retractable and tunnel hydraulic thrusters.
The connection of the electric motor to the hydraulic control system has several advantages in comparison with its use directly on the thruster:
Better weight distribution in the vessel.
Possibility of installing thrusters in areas with increased humidity.
Allows the electric motor to be located next to the battery, away from the bow or stern thrusters.
Max Power supplies a full range of accessories and spare parts, including additional equipment – oil tanks, hydraulic valves, etc.
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