POD drive unit

Abstract

a POD drive unit for a marine vessel has a housing, an axial flux motor connected with a first shaft for rotating a pitchable propeller, a second shaft arranged concentric within the first shaft, the second shaft being movable independently of the first shaft, the second shaft having a first end having a connection part and a second end, an adjustment device comprising a first part being connected with the first shaft, a second part being connected with the connection part, and a movable part. The movable part is configured to be moved between a first position and a second position so as to turn the first part and / or the second part thereby providing a phase shift between the first shaft and the second shaft for pitching and / or folding the pitchable propeller.

Description

TECHNICAL FIELD

[0001] The disclosure relates generally to propulsion of a marine vessel. In particular aspects, the disclosure relates to a POD drive unit for a marine vessel. The disclosure can be applied to marine vessels, such as watercrafts, motorboats, work boats, sport vessels, boats, ships, sailing boats among other vessel types. Although the disclosure may be described with respect to a particular marine vessel, the disclosure is not restricted to any particular marine vessel.BACKGROUND

[0002] Marine propulsion systems are critical for the operation of marine vessels, enabling movement and maneuverability in various aquatic environments. One of the key components in these systems is the propeller, which is responsible for converting rotational energy from the power source into thrust. For optimal performance, it is essential to control the pitch of the propeller blades, as this directly affects the efficiency, speed, and power consumption of the vessel.

[0003] Among these propulsion systems, POD drive units are known to their capability to offer enhanced maneuverability and improved hydrodynamic efficiency. Despite their advantages, current POD drive solutions exhibit significant limitations, particularly concerning the integration of pitchable propellers.

[0004] Traditional POD drive units often lack an effective mechanism for expediently adjusting the pitch of the propeller, which is crucial for optimizing propulsion efficiency under varying operational conditions. This deficiency can lead to suboptimal performance, increased power consumption, and reduced responsiveness in dynamic marine environments. Furthermore, the inability to adaptively manage propeller pitch may result in wear and tear on the drive components, thereby increasing maintenance costs and reducing the longevity of the propulsion system.

[0005] In light of these challenges, advancements in POD drive technology are imperative to ensure that marine vessels can operate with greater agility and reduced environmental impact. By addressing the limitations of prior art, a new generation of POD drive units can significantly improve the adaptability and effectiveness of marine propulsion systems.

[0006] Therefore, there is a need for an improved POD drive unit that offers a simplified and effective means of controlling the pitch of a propeller. Such an advancement would enhance the overall performance, reliability, and efficiency of marine vessels, addressing the shortcomings of existing technologies and meeting the demands of modern maritime operations.SUMMARY

[0007] According to a first aspect of the disclosure, a POD drive unit for a marine vessel, comprising a housing, an axial flux motor connected with a first shaft for rotating a pitchable propeller, a second shaft arranged concentric within the first shaft, the second shaft being movable independently of the first shaft, the second shaft having a first end having a connection part and a second end, an adjustment device comprising a first part being connected with the first shaft, a second part being connected with the connection part, and a movable part, wherein the movable part is configured to be moved between a first position and a second position so as to turn the first part and / or the second part thereby providing a phase shift between the first shaft and the second shaft for pitching and / or folding the pitchable propeller.

[0008] The first aspect of the disclosure may seek to address the limitations of current POD drive units in effectively adjusting propeller pitch, which impacts performance and efficiency.

[0009] A technical benefit may include providing improved adaptability in marine propulsion systems by enabling precise and efficient pitch adjustment of the propeller. This advancement enhances hydrodynamic efficiency and maneuverability, reduces power consumption, and decreases wear on drive components, thereby lowering maintenance costs and extending the operational lifespan of the propulsion system.

[0010] Optionally in some examples, including in at least one preferred example, the first part comprises a first part end being connected with the first shaft and a first projection extending from the first part in an axial direction, the first projection having a first inner face with a first inner thread and a first outer face. A technical benefit may include enhanced structural integrity and improved transmission of rotational force due to the secure connection between the first part and the shaft, facilitating efficient propeller pitch adjustments.

[0011] Optionally in some examples, including in at least one preferred example, the second part comprises a second part end being connected with the second shaft and a second projection extending from the second part in the axial direction, the second projection having a second inner face and a second outer face with a second outer thread. A technical benefit may include providing robust alignment and stability between the components, which contributes to smoother and more reliable operation of the pitch adjustment mechanism.

[0012] Optionally in some examples, including in at least one preferred example, the movable part comprises a third part end, a third projection extending from the third part end in the axial direction, the third projection having a third outer face with a third outer thread, and a fourth projection extending from the third part end in the axial direction, the fourth projection being hollow and has a fourth inner face with a fourth inner thread, the fourth projection being arranged around the third projection with a distance between them. A technical benefit may include allowing for precise and independent movement of the components, enabling fine-tuned adjustments to the propeller pitch, thus enhancing propulsion efficiency.

[0013] Optionally in some examples, including in at least one preferred example, the first part, the second part and the movable part are assembled so that the first inner thread interacts with the third outer thread and the second outer thread interacts with the fourth inner thread so that when the movable part is moved in the axial direction, the first part and the second part are turned so that a phase shift between the first shaft and the second shaft occur. A technical benefit may include enabling synchronized and controlled phase shifting between shafts, optimizing propeller blade orientation for various operational conditions, thereby improving vessel performance.

[0014] Optionally in some examples, including in at least one preferred example, the first inner thread and the third outer thread have a first helical angle or a first thread lead, and the second outer thread and the fourth inner thread have a second helical angle or a second thread lead, wherein the first helical angle or the first thread lead is different from the second helical angle or the second thread lead. A technical benefit may include providing precise control over the timing and extent of pitch adjustments, optimizing propulsion performance for varying speeds and conditions.

[0015] Optionally in some examples, including in at least one preferred example, an actuator is arranged for moving the movable part in the axial direction between the first position and the second position and any intermediate positions there between. A technical benefit may include enabling automated and precise control of propeller pitch, enhancing operational efficiency and reducing the need for manual intervention.

[0016] Optionally in some examples, including in at least one preferred example, the actuator is a motor, linear pneumatic or hydraulic cylinder, drive belt, or similar devices being able to move the movable part in the axial direction. A technical benefit may include offering versatility in actuator options, allowing for tailored solutions to meet specific vessel requirements and operational conditions.

[0017] Optionally in some examples, including in at least one preferred example, further comprising a control unit being operatively connected with the axial flux motor, the movable part and / or the actuator. A technical benefit may include enabling centralized and coordinated control of the propulsion system components, optimizing performance and simplifying system management.

[0018] Optionally in some examples, including in at least one preferred example, the control unit is configured to control the movable part and / or the actuator on basis of vessel data received from the marine vessel. A technical benefit may include allowing for adaptive and data-driven adjustments to propeller pitch, enhancing responsiveness to changing operational conditions and improving overall efficiency.

[0019] Optionally in some examples, including in at least one preferred example, the vessel data relates to power consumption, modes of operation of the marine vessel, torque of the axial flux motor, load of the marine vessel, speed of the marine vessel, or a combination thereof. A technical benefit may include enabling comprehensive monitoring and analysis of vessel performance parameters, facilitating optimized propulsion settings and reducing energy consumption.

[0020] Optionally in some examples, including in at least one preferred example, the control unit is configured to adjust the pitch angle of the pitchable propeller on basis of the vessel data. A technical benefit may include enhancing the precision of pitch adjustments, ensuring optimal performance and fuel efficiency under varying maritime conditions.

[0021] Optionally in some examples, including in at least one preferred example, a coupling is arranged between the first shaft, the second shaft and the pitchable propeller for changing a pitch angle of the pitchable propeller when the phase shift between the first shaft and the second shaft occur. A technical benefit may include enabling seamless integration of pitch adjustment mechanisms, enhancing the overall reliability and functionality of the propulsion system.

[0022] Optionally in some examples, including in at least one preferred example, the coupling comprises a first gear and a second gear, the first shaft is directly connected to the first gear and the second shaft is directly connected to the second gear. A technical benefit may include providing efficient torque transmission and synchronization between shafts, ensuring stable and precise propeller pitch adjustments.

[0023] Optionally in some examples, including in at least one preferred example, the pitchable propeller has a plurality of propeller blades, each propeller blade being connected to a blade gear. A technical benefit may include allowing for independent control of each blade, enhancing the versatility and efficiency of the propulsion system under varied operational conditions.

[0024] Optionally in some examples, including in at least one preferred example, the first gear and the second gear are connected to the blade gears. A technical benefit may include ensuring synchronized movement and alignment of propeller blades, enhancing propulsion efficiency and reducing wear on mechanical components.

[0025] Optionally in some examples, including in at least one preferred example, the control unit is configured to precisely positioning the movable part. A technical benefit may include achieving high precision in pitch adjustments, which translates to optimized propulsion performance and reduced energy usage.

[0026] Optionally in some examples, including in at least one preferred example, the control unit comprises a feedback loop for real-time monitoring and adjustment of the movable part. A technical benefit may include enabling continuous performance optimization and adaptive response to operational changes, enhancing the reliability and efficiency of the propulsion system.

[0027] According to a second aspect of the disclosure, a marine vessel comprising a POD drive unit as disclosed herein. The second aspect of the disclosure may seek to address the limitations of current POD drive units in effectively adjusting propeller pitch, which impacts performance and efficiency. A technical benefit may include providing improved adaptability in marine propulsion systems by enabling precise and efficient pitch adjustment of the propeller. This advancement enhances hydrodynamic efficiency and maneuverability, reduces power consumption, and decreases wear on drive components, thereby lowering maintenance costs and extending the operational lifespan of the propulsion system.

[0028] According to a third aspect of the disclosure, a method for pitching a pitchable propeller of a POD drive unit as described herein, comprising connecting an axial flux motor with a first shaft for rotating a pitchable propeller, arranging a second shaft concentric within the first shaft, the second shaft being movable independently of the first shaft, the second shaft having a first end having a connection part and a second end, arranging an adjustment device comprising a first part being connected with the first shaft, a second part being connected with the connection part, and a movable part, moving the movable part between a first position and a second position so as to turn the first part and / or the second part thereby providing a phase shift between the first shaft and the second shaft for pitching and / or folding the pitchable propeller.

[0029] The third aspect of the disclosure may seek to address the limitations of current POD drive units in effectively adjusting propeller pitch, which impacts performance and efficiency. A technical benefit may include providing improved adaptability in marine propulsion systems by enabling precise and efficient pitch adjustment of the propeller. This advancement enhances hydrodynamic efficiency and maneuverability, reduces power consumption, and decreases wear on drive components, thereby lowering maintenance costs and extending the operational lifespan of the propulsion system.

[0030] The disclosed aspects, examples (including any preferred examples), and / or accompanying claims may be suitably combined with each other as would be apparent to anyone of ordinary skill in the art. Additional features and advantages are disclosed in the following description, claims, and drawings, and in part will be readily apparent therefrom to those skilled in the art or recognized by practicing the disclosure as described herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Examples are described in more detail below with reference to the appended drawings.

[0032] FIG. 1 is an exemplary POD drive unit according to an example.

[0033] FIG. 2 is another exemplary POD drive unit according to an example.

[0034] FIGS. 3-4 are different views of the POD drive unit of FIG. 2.

[0035] FIG. 5 is an exemplary adjustment device according to an example.

[0036] FIGS. 6a-6b show the phase shift provided by the adjustment device.DETAILED DESCRIPTION

[0037] The detailed description set forth below provides information and examples of the disclosed technology with sufficient detail to enable those skilled in the art to practice the disclosure.

[0038] The marine industry has long sought to optimize propulsion systems for vessels, aiming to achieve a balance between efficiency, maneuverability, and operational control. Traditional POD drive systems often struggle with the integration of effective pitch-changing mechanisms. The ability to expediently adjust the pitch of a propeller is crucial for optimizing thrust and efficiency across varying speeds and environmental conditions. Prior art solutions typically lack the sophistication required for seamless pitch adjustment, resulting in compromised performance, particularly in dynamic maritime environments where rapid changes in vessel speed and direction are necessary.

[0039] Existing solutions often lack the ability to simply and effectively control and adjust the pitch angle of a pitchable propeller. This limitation hampers the ability to fine-tune the POD drive units for improved maneuverability and efficiency in a simple manner. For instance, when navigating through rough seas or executing complex maneuvers, the inability to adjust the pitch angle of the propeller can result in reduced control, increased wear on the propulsion components, and higher power consumption.

[0040] Improvements in marine propulsion technology are therefore needed to address these shortcomings. A more advanced approach that allows for precise and independent control of the propeller pitch can enhance the overall performance and reliability of marine vessels. Such advancements would not only improve power efficiency and reduce environmental impact but also provide better handling and adaptability in diverse maritime conditions and varying states of the marine vessel.

[0041] Therefore, there is a need for an improved POD drive unit that offers a simplified and effective means of controlling the pitch of a propeller. Such an advancement would enhance the overall performance, reliability, and efficiency of marine vessels, addressing the shortcomings of existing technologies and meeting the demands of modern maritime operations.

[0042] The present disclosure addresses these disadvantages by providing a simple yet robust adjustment device enabling the possibility for changing a pitch angle of the pitchable propeller in a POD drive unit or even in certain circumstances folding it.

[0043] FIG. 1 is an exemplary POD drive unit 1 for a marine vessel 100. The POD drive unit 1 comprises a housing 2 being submerged in the water during operation. The POD drive unit 1 further comprising an axial flux motor 3 connected with a first shaft 4 for rotating a pitchable propeller 5. A second shaft 6 is arranged concentric within the first shaft 4, the second shaft 6 being movable independently of the first shaft 4. Furthermore, the second shaft 6 has a first end 7 having a connection part 8 and a second end 9.

[0044] The POD drive unit 1 comprises an adjustment device 20 comprising a first part 21 being connected with the first shaft 4, a second part 22 being connected with the connection part 8, and a movable part 23, wherein the movable part 23 is configured to be moved between a first position and a second position so as to turn the first part 21 and / or the second part 22 thereby providing a phase shift between the first shaft 4 and the second shaft 6 for pitching and / or folding the pitchable propeller 5. The overall performance and efficiency of marine vessels by allowing for more precise and adaptive control of the propeller pitch of a POD drive unit 1 is thereby enhanced. This improvement addresses the shortcomings of complex and maintenance-prone prior art systems, resulting in reduced operational costs and increased reliability. Additionally, the ability to dynamically adjust the propeller pitch of a POD drive unit can enhance power efficiency, thereby contributing to more environmentally friendly marine operations.

[0045] The pitch angle of a pitchable propeller 5 refers to the angle between the chord line of the propeller blade and the plane of rotation 10. This angle is measured around the pitch axis 11, which is an imaginary line perpendicular to the blade's chord line and extends through a hub of the pitchable propeller 5. Different pitch angles can significantly influence sailing conditions and the performance of the marine vessel. At a low pitch angle, the blades are more aligned with the direction of rotation. This generates less thrust but allows for higher rotational speeds. This setting is typically used for low-speed operations, such as maneuvering in tight spaces or when the vessel is lightly loaded. It can also be beneficial during acceleration from a standstill. At a high pitch angle, the blades are more perpendicular to the direction of rotation 10. This generates more thrust but results in lower rotational speeds. This setting is ideal for high-speed cruising or when the vessel is heavily loaded, as it provides greater propulsion force. However, it can increase the load on the motor and reduce power efficiency if not managed correctly.

[0046] In addition, at variable pitch angles the blades can be adjusted to various angles between the low and high extremes. This allows for optimized performance across different sailing conditions. By dynamically adjusting the pitch angle, the propulsion system can balance the need for speed, thrust, and power efficiency. For example, a moderate pitch angle can provide a good compromise between speed and thrust for general cruising. By adjusting the pitch angle, the propulsion unit can tailor the thrust characteristics to match specific operational requirements, improving overall vessel performance, power efficiency, and maneuverability under diverse sailing conditions. The present disclosure aiming at providing a solution for adjusting the variable pitch angles of the pitchable propeller in a simple manner.

[0047] According to the present disclosure, a phase shift between the first shaft 4 and the second shaft 6 refers to the relative angular displacement or difference in the rotational positions of the two shafts. The phase shift is the relative angular displacement between two rotating shafts 4, 6, measured as the difference in the angular positions of the shafts at any given moment. It is often described in degrees or radians.

[0048] The phase shift between the first shaft 4 and the second shaft 6 is according to the disclosure achieved through the adjustment device 20 that is configured to modify the relative angular positions of the shafts. This adjustment device 20 comprises the first part 21 connected to the first shaft 4, the second part 22 connected to the second shaft 6 via the connection part 8, and the movable part 23 is configured to be moved between different positions in an axial direction.

[0049] When the movable part 23 is actuated, it interacts with the first and second parts 21, 22 in a manner that causes one or both of the shafts 4, 6 to rotate relative to each other. This interaction may be facilitated by actuating the movable part 23 whereby the common adjustment device 20 translates the linear movement of the movable part 23 into a change in the angular positions of the shafts. The resultant phase shift alters the pitch angle of the propeller blades connected to the shafts, optimizing their orientation for different operational conditions.

[0050] This phase shift may be controlled via an actuator 24 that moves the movable part 23 of the adjustment device 20, thereby finely tuning the propeller pitch for optimal performance under varying loads, speeds, and environmental conditions. The ability to induce a phase shift between the first shaft 4 and the second shaft 6 allows for precise and adaptive control of the propeller pitch. This leads to enhanced propulsion efficiency, better power economy, and improved maneuverability of the marine vessel, addressing the limitations of prior art solutions that lack such dynamic control mechanisms for the POD drive units.

[0051] Hence, the actuator 24 is configured for moving the movable part 23 in the axial direction between the first position and the second position and any intermediate positions there between. A technical benefit may include enabling automated and precise control of propeller pitch, enhancing operational efficiency and reducing the need for manual intervention.

[0052] The actuator 24 may be a motor, linear pneumatic or hydraulic cylinder, drive belt, or similar devices being able to move the movable part 23 in the axial direction. A technical benefit may include offering versatility in actuator options, allowing for tailored solutions to meet specific vessel requirements and operational conditions.

[0053] A marine POD drive unit 1 according to the disclosure is a propulsion system utilized in maritime vessels, operating fully submerged beneath the waterline to provide thrust and superior maneuverability. This POD drive unit 1 is characterized by its integration of essential components, including an electric motor and a propeller, all encapsulated within a streamlined pod structure. The encapsulation minimizes hydrodynamic drag, enhancing the vessel's efficiency as it moves through the water.

[0054] Additionally, the use of an axial flux motor 3 within POD drive units offers compact and efficient power delivery, directly transmitting rotational force to the propeller. This design facilitates the incorporation of a pitchable propeller, allowing adjustments to the blade angle to optimize propulsion under varying operational conditions. The control system of a POD drive unit, which may include automated or manual inputs, further differentiates it by enabling real-time adjustments to motor speeds and propeller pitch, based on navigational needs and vessel data.

[0055] Under operation, the POD drive unit's submerged position significantly reduces noise and vibrations compared to stern drives and outboards, enhancing onboard comfort and reducing environmental disturbances.

[0056] In FIG. 1, the POD drive unit 1 is connected to the marine vessel 100 via a fin 19 so that the POD drive unit 1 may be positioned a distance from a hull of the marine vessel 100 so that the rotation of the pitchable propeller 5 do not interfere with the hull, and a more enhanced flow around the POD drive unit 1 may be obtained.

[0057] In addition, the POD drive unit 1 may be retractable into the hull of the marine vessel 100 when not in use or it may be arranged permanent in the intended position under the hull.

[0058] The housing 2 may comprise a streamlined outer contour to reduce hydrodynamic drag of the entire POD drive unit 1. A technical benefit may include improved vessel speed and decreased power consumption by minimizing resistance through water.

[0059] The axial flux motor 3 may be arranged in front of the pitchable propeller 5 where the pitchable propeller 5 is configured to push the marine vessel 100. In another example, the axial flux motor 3 may be arranged behind the pitchable propeller 5 where the pitchable propeller 5 is configured to pull the marine vessel 100. In FIG. 1, the axial flux motor 3 is arranged in front of the pitchable propeller 5.

[0060] Furthermore, the axial flux motor 3 may be a permanent magnet synchronous motor. A technical benefit may include delivering high efficiency and reduced size and weight, optimizing power output and contributing to compact and efficient propulsion system design. The permanent magnet synchronous motor 3 may comprise rare-earth magnets. A technical benefit may include providing superior magnetic properties and efficiency, enhancing motor performance and reducing energy consumption for prolonged operational periods.

[0061] Also, the axial flux motor 3 may be arranged within the housing 2. A technical benefit may include providing a compact and integrated design, reducing system footprint. In addition, by the present disclosure only one motor is necessary for the rotation of the pitchable propeller 5 thereby reducing the size of the housing.

[0062] The POD drive unit 1 may also comprise a cooling system for the axial flux motor 3. A technical benefit may include maintaining optimal operating temperatures, reducing the risk of overheating and extending the lifespan of the motor. The cooling system may be a liquid cooling system. A technical benefit may include providing efficient heat dissipation, enhancing motor performance and reliability under high-load conditions.

[0063] In addition, the POD drive unit 1 may further comprise a vibration dampening system to reduce noise and mechanical stress. A technical benefit may include enhancing passenger comfort and reducing mechanical wear, extending the operational life of the propulsion system.

[0064] The axial flux motor 3 may also be configured to operate at variable speeds for different marine conditions. A technical benefit may include providing adaptive power output and efficiency, optimizing propulsion performance and fuel usage across varying operational scenarios.

[0065] Moreover, the POD drive unit 1 may further comprise a power supply 25 for the axial flux motor 3. A technical benefit may include reliable and consistent power delivery, ensuring uninterrupted propulsion performance. The power supply 25, such as a battery pack, may be arranged on the marine vessel 100. A redundant power supply for the axial flux motor may also be arranged on the marine vessel. A technical benefit may include enhanced reliability and operational security, providing backup power in case of primary power supply failure.

[0066] In addition, the POD drive unit 1 may be rotatably connected with the marine vessel 100. A technical benefit may include increased maneuverability and flexibility, allowing for dynamic positioning and orientation of the propulsion system. The POD drive unit 1 may be rotated around the propulsion rotation axis 26 as seen in FIG. 1, so that the POD drive unit 1 may be used to steer and maneuver the marine vessel.

[0067] The POD drive unit 1 may also comprise a control unit 12 being operatively connected with the axial flux motor 3, the movable part 23 and / or the actuator 24. A technical benefit may include enabling centralized and coordinated control of the propulsion system components, optimizing performance and simplifying system management.

[0068] The control unit 12 may include a microprocessor, microcontroller, programmable digital signal processor or another programmable device. The control unit 12 may also, or instead, include an application specific integrated circuit, a programmable gate array or programmable array logic, a programmable logic device, or a digital signal processor. Where the control unit 12 includes a programmable device such as the microprocessor, microcontroller or programmable digital signal processor mentioned above, the processor may further include computer executable code that controls operation of the programmable device. The control unit 12 may be arranged on the marine vessel 100 or directly in the housing 2.

[0069] The control unit 12 may be configured to control the movable part 23 and / or the actuator 24 on basis of vessel data received from the marine vessel 100. A technical benefit may include allowing for adaptive and data-driven adjustments to propeller pitch, enhancing responsiveness to changing operational conditions and improving overall efficiency. The vessel data may relate to power consumption, modes of operation of the marine vessel, torque of the axial flux motor, load of the marine vessel, speed of the marine vessel, or a combination thereof. A technical benefit may include enabling comprehensive monitoring and analysis of vessel performance parameters, facilitating optimized propulsion settings and reducing energy consumption. Additionally, the control unit 12 may be configured to adjust the pitch angle of the pitchable propeller 5 on basis of the vessel data. A technical benefit may include enhancing the precision of pitch adjustments, ensuring optimal performance and fuel efficiency under varying maritime conditions.

[0070] Moreover, the control unit 12 may be configured to control the movable part 23 and / or the actuator 24 on basis of input data received from an input unit operated by an operator on board the marine vessel 100. A technical benefit may include providing operators with direct control over pitch adjustments, allowing for immediate response to situational demands and enhancing vessel maneuverability. The control unit 12 may be configured to adjust the pitch angle of the pitchable propeller 5 on basis of the input data. A technical benefit may include ensuring that operator input is accurately translated into precise pitch adjustments, enhancing the vessel's handling and performance in dynamic environments.

[0071] Furthermore, the control unit 12 may be configured to precisely positioning the movable part 23. A technical benefit may include achieving high precision in pitch adjustments, which translates to optimized propulsion performance and reduced energy usage.

[0072] The control unit 12 may also comprise a feedback loop for real-time monitoring and adjustment of the movable part 23. A technical benefit may include enabling continuous performance optimization and adaptive response to operational changes, enhancing the reliability and efficiency of the propulsion system.

[0073] FIG. 2 is another example of a POD drive unit 1 according to the disclosure. The POD drive unit 1 comprises a housing 2 being submerged in the water during operation. The POD drive unit 1 further comprising an axial flux motor 3 connected with a first shaft 4 for rotating a pitchable propeller 5. A second shaft 6 is arranged concentric within the first shaft 4, the second shaft 6 being movable independently of the first shaft 4. Furthermore, the second shaft 6 has a first end 7 having a connection part 8 and a second end 9.

[0074] The POD drive unit 1 comprises an adjustment device 20 comprising a first part 21 being connected with the first shaft 4, a second part 22 being connected with the connection part 8, and a movable part 23, wherein the movable part 23 is configured to be moved between a first position and a second position so as to turn the first part 21 and / or the second part 22 thereby providing a phase shift between the first shaft 4 and the second shaft 6 for pitching and / or folding the pitchable propeller 5.

[0075] The POD drive unit 1 may also comprise a coupling 14. The coupling 14 is arranged between the first shaft 4, the second shaft 6 and the pitchable propeller 5 for changing a pitch angle of the pitchable propeller 5 when the phase shift between the first shaft 4 and the second shaft 6 occur. A technical benefit may include enabling seamless integration of pitch adjustment mechanisms, enhancing the overall reliability and functionality of the propulsion system. The coupling 14 comprises a first gear 15 and a second gear 16, the first shaft 4 is directly connected to the first gear 15 and the second shaft 6 is directly connected to the second gear 16 via the connection part. A technical benefit may include providing efficient torque transmission and synchronization between shafts, ensuring stable and precise propeller pitch adjustments.

[0076] The pitchable propeller 5 has a plurality of propeller blades 17, each propeller blade 17 being connected to a blade gear 18. A technical benefit may include allowing for independent control of each blade, enhancing the versatility and efficiency of the propulsion system under varied operational conditions.

[0077] When a phase shift between the first shaft 4 and the second shaft 6 is provided by the adjustment device 20, the phase shift will provide a movement of either the first gear or the second gear, which in turn will rotate the blade gears and thereby provide a change of the pitch angle of the pitchable propeller 5.

[0078] The adjustment device 20 is arranged on the opposite side of the axial flux motor 3 compared to the pitchable propeller 5. Hence, the first shaft 4 is hollow. In other examples, the adjustment device may be arranged at other positions within the housing.

[0079] In FIGS. 2-4, the pitchable propeller 5 has a first blade 17 and a second blade 17, the first blade 17 is connected to a first blade gear 18 and the second blade 17 is connected to a second blade gear 18. A technical benefit may include providing balanced and coordinated pitch adjustments across multiple blades, optimizing thrust and reducing mechanical stress on the system.

[0080] In another example, the pitchable propeller has a first blade, a second blade and a third blade, the first blade is connected to a first blade gear, the second blade is connected to a second blade gear and the third blade is connected to a third blade gear. A technical benefit may include enabling complex and precise pitch control configurations, enhancing propulsion efficiency and maneuverability.

[0081] In yet another example, the pitchable propeller has a first blade, a second blade, a third blade and a fourth blade, the first blade is connected to a first blade gear, the second blade is connected to a second blade gear, the third blade is connected to a third blade gear and the fourth blade is connected to a fourth blade gear. A technical benefit may include maximizing thrust production and control precision, improving vessel performance and adaptability in diverse marine environments.

[0082] The first gear 15 and the second gear 16 are connected to the blade gears 18. A technical benefit may include ensuring synchronized movement and alignment of propeller blades, enhancing propulsion efficiency and reducing wear on mechanical components. The first and second gears 15, 16 and the blade gears 18 may be beveled gears interacting and / or meshing with each other.

[0083] In an example, the pitchable propeller 5 is foldable. A technical benefit may include providing compact storage and reduced drag when the vessel is not in motion, enhancing fuel efficiency and reducing operational costs.

[0084] FIGS. 3-4 show the POD drive unit 1 of FIG. 2 without the housing. In FIG. 3, the POD drive unit 1 is seen from the outside, and in FIG. 4, the POD drive unit 1 is shown in a cross-sectional view. The POD drive unit 1 comprises an axial flux motor 3 connected with a first shaft 4 for rotating a pitchable propeller 5. A second shaft 6 is arranged concentric within the first shaft 4, the second shaft 6 being movable independently of the first shaft 4. Furthermore, the second shaft 6 has a first end 7 having a connection part 8 and a second end 9.

[0085] The POD drive unit 1 comprises an adjustment device 20 comprising a first part 21 being connected with the first shaft 4, a second part 22 being connected with the connection part 8, and a movable part 23, wherein the movable part 23 is configured to be moved between a first position and a second position so as to turn the first part 21 and / or the second part 22 thereby providing a phase shift between the first shaft 4 and the second shaft 6 for pitching and / or folding the pitchable propeller 5.

[0086] The POD drive unit 1 also comprises the coupling 14. The coupling 14 is arranged between the first shaft 4, the second shaft 6 and the pitchable propeller 5 for changing a pitch angle of the pitchable propeller 5 when the phase shift between the first shaft 4 and the second shaft 6 occur. The coupling 14 comprises a first gear 15 and a second gear 16, the first shaft 4 is directly connected to the first gear 15 and the second shaft 6 is directly connected to the second gear 16.

[0087] FIG. 5 shows an example of the adjustment device 20 in a not assembled state. In the first row the first part 21, the second part 22 and the movable part 23 are shown from an outside view and the second row the different parts are shown in a cross-sectional view taken along the A-line in the first row.

[0088] The first part 21 comprises a first part end 40 being connected with the first shaft and a first projection 41 extending from the first part 40 in an axial direction, the first projection 41 having a first inner face 42 with a first inner thread 43 and a first outer face 44.

[0089] The second part 22 comprises a second part end 45 being connected with the second shaft and a second projection 46 extending from the second part 45 in the axial direction, the second projection 46 having a second inner face 47 and a second outer face 48 with a second outer thread 49.

[0090] Moreover, the movable part 23 comprises a third part end 50, a third projection 51 extending from the third part end 50 in the axial direction. In the present example, the third projection extends in an opposite direction compared to the first projection and the second projection. The third projection 51 having a third outer face 52 with a third outer thread 53, and a fourth projection 54 extending from the third part end 50 in the axial direction, the fourth projection 54 being hollow and has a fourth inner face 55 with a fourth inner thread 56, the fourth projection 54 being arranged around the third projection 51 with a distance between them. A technical benefit may include providing a compact and efficient design for the movable part, facilitating smoother and more precise adjustments in the propeller pitch. The fourth projection has fourth outer face 57. The actuator may be connected with the movable part 23.

[0091] Furthermore, the first part 21, the second part 22 and the movable part 23 may be assembled so that the first inner thread 43 interacts with the third outer thread 53 and the second outer thread 49 interacts with the fourth inner thread 56 so that when the movable part 23 is moved in the axial direction the first part 21 and the second part 22 are turned so that a phase shift between the first shaft and the second shaft occur. A technical benefit may include enabling precise control of the phase shift between the shafts, which can optimize the propeller pitch adjustment process.

[0092] The threads may be formed as helical guides that may interact with each other. A technical benefit may include facilitating smoother and more efficient movement between the interconnected parts, which can enhance the precision of propeller pitch adjustments. The helical guides may comprise a helical grooves and helical protrusions or knobs being configured to interact. A technical benefit may include improving the mechanical engagement between components, which can lead to more reliable and accurate pitch adjustments.

[0093] Helical guides may be structural elements designed to facilitate smooth and controlled movement of mechanical parts along a helical path. These guides ensure that rotational and linear movements may be converted or synchronized, such as in the adjustment device of the present disclosure. Helical guides may take the form of grooves, protrusions, or threads that follow a helical (spiral) pattern around a cylindrical component.

[0094] The helical angle, also known as the lead angle, is the angle between the helical path and a plane perpendicular to the axis of the cylindrical component and determines the rate at which the guide moves along the axis as it rotates. Another factor is the pitch, which is the distance between corresponding points on adjacent turns of the helical path. This pitch determines how far the guide moves linearly for each complete rotation.

[0095] The thread profile, which is the cross-sectional shape of the helical guide, can be triangular, square, trapezoidal, or custom-shaped, depending on the application requirements for strength, load distribution, and wear resistance. The choice of material for the helical guides are designed so as withstand the operational environment, including factors like corrosion resistance, mechanical strength, and wear characteristics.

[0096] In terms of interaction mechanisms, helical guides are designed to engage with corresponding parts, such as inner or outer threads, grooves, or knobs. This interaction may ensure smooth engagement and disengagement, minimizing friction and wear.

[0097] The technical benefits of helical guides or threads are many. They ensure smooth and precise movement of the mechanical parts, reducing the risk of jamming or excessive wear. The helical design allows for efficient transmission of force, enabling the conversion of rotational movement into linear movement or vice versa.

[0098] In addition, the threads or the helical guides which are not interacting may have different helical angles or thread leads. A technical benefit may include providing greater flexibility in the design and operation of the propulsion unit, allowing for customized pitch adjustment characteristics. Furthermore, the axial forces in the adjustment device may be cancelled due to the different helical angles or thread leads.

[0099] In an example, the first inner thread 43 and the third outer thread 53 may have a first helical angle or a first thread lead, and the second outer thread 49 and the fourth inner thread 56 may have a second helical angle or a second thread lead, wherein the first helical angle or the first thread lead is different from the second helical angle or the second thread lead. A technical benefit may include enabling differential movement between the interconnected parts, which can optimize the propeller pitch adjustment process.

[0100] In addition, one or more bearing(s) may be arranged between the first part and the second part and the movable part, respectively. A technical benefit may include reducing friction and wear between moving components, enhancing the durability and longevity of the POD drive unit and ensuring smoother operational transitions during pitch adjustments. The bearing may be a roller bearing, ball screw arrangement, or the like. A technical benefit may include providing efficient load distribution and reduced friction, leading to improved mechanical efficiency and reduced energy consumption during propeller pitch adjustments.

[0101] In FIG. 6a, the adjustment device 20 is shown. The first part 21 has in the example a first flange 70 protruding from the first part 21. The second part 22 has a second flange 71 protruding from the second part 22. The first flange 70 and the second flange 71 are aligned in FIG. 6a. In FIG. 6b, the movable part 23 has been moved in the axial direction 35 whereby the first part 21 is turned left and the second part 22 is turned right so that the first flange 70 and the second flange 71 have been turned away from each other. By this movement of the movable part the phase shift occurs, which in the present disclosure is used to change a pitch angle of the pitchable propeller 5.

[0102] The first shaft 4 and the second shaft 6 are connected with the pitchable propeller 5 in a hub. In addition, a coupling 14 is arranged between the first shaft 4, the second shaft 6 and the pitchable propeller 5 for changing a pitch angle of the pitchable propeller 5 when the phase shift occurs. A technical benefit may include precise control over the pitch angle for optimized propulsion efficiency.

[0103] Furthermore, the housing may comprise an integrated sensor system for monitoring operational parameters such as temperature, pressure, and rotational speed. A technical benefit may include enabling real-time diagnostics and performance monitoring, improving maintenance scheduling and system reliability.

[0104] The present disclosure also relates to a marine vessel 100 comprising the POD drive unit 1 as disclosed herein.

[0105] The present disclosure also relates to a method for pitching a pitchable propeller 5 of a POD drive unit 1 as disclosed herein. The method comprising: connecting an axial flux motor 3 with a first shaft 4 for rotating a pitchable propeller 5, arranging a second shaft 6 concentric within the first shaft 4, the second shaft 6 being movable independently of the first shaft 4, the second shaft 6 having a first end 7 having a connection part 8 and a second end 9, arranging an adjustment device 20 comprising a first part 21 being connected with the first shaft 4, a second part 22 being connected with the connection part 8, and a movable part 23, moving the movable part 23 between a first position and a second position so as to turn the first part 21 and / or the second part 22 thereby providing a phase shift between the first shaft 4 and the second shaft 6 for pitching and / or folding the pitchable propeller 5. A technical benefit may include providing a method for precise and dynamic adjustment of propeller pitch, enhancing vessel responsiveness, propulsion efficiency, and adaptability to varying marine conditions.

[0106] The method further comprising controlling the movable part 23 and / or an actuator 24 based on vessel data received from the marine vessel. A technical benefit may include enabling data-driven optimization of propulsion settings, enhancing energy efficiency and performance reliability by adapting to real-time operational conditions. The vessel data may include parameters such as power consumption, modes of operation, torque of the axial flux motor 3, load of the marine vessel, speed of the marine vessel, or a combination thereof. A technical benefit may include facilitating comprehensive performance analysis and adjustment, improving fuel efficiency and operational effectiveness by tailoring propulsion settings to specific conditions.

[0107] The method may further comprise adjusting the pitch angle of the pitchable propeller 5 based on the vessel data. A technical benefit may include ensuring optimal thrust and efficiency, reducing energy consumption and enhancing vessel performance by dynamically adapting to changing conditions.

[0108] Also, the method may further comprise controlling the movable part 23 and / or the actuator 24 based on input data received from an input unit operated by an operator. A technical benefit may include providing intuitive manual control over propulsion settings, enhancing operational flexibility and responsiveness to situational demands.

[0109] In addition, adjusting the pitch angle of the pitchable propeller 5 may be based on the input data provided by the operator. A technical benefit may include ensuring precise and immediate adjustment capabilities, improving vessel handling and maneuverability in diverse marine environments.

[0110] Certain aspects and variants of the disclosure are set forth in the following examples numbered consecutive below.

[0111] Example 1: A POD drive unit (1) for a marine vessel (100), comprising a housing (2), an axial flux motor (3) connected with a first shaft (4) for rotating a pitchable propeller (5), a second shaft (6) arranged concentric within the first shaft (4), the second shaft (6) being movable independently of the first shaft (4), the second shaft (6) having a first end (7) having a connection part (8) and a second end (9), an adjustment device (20) comprising a first part (21) being connected with the first shaft (4), a second part (22) being connected with the connection part (8), and a movable part (23), wherein the movable part (23) is configured to be moved between a first position and a second position so as to turn the first part (21) and / or the second part (22) thereby providing a phase shift between the first shaft (4) and the second shaft (6) for pitching and / or folding the pitchable propeller (5).

[0112] Example 2: The POD drive unit (1) of Example 1, wherein the first part (21) comprises a first part end (40) being connected with the first shaft (4) and a first projection (41) extending from the first part (21) in an axial direction, the first projection (41) having a first inner face (42) with a first inner thread (43) and a first outer face (44).

[0113] Example 3: The POD drive unit (1) of Example 2, wherein the second part (21) comprises a second part end (45) being connected with the second shaft (6) and a second projection (46) extending from the second part (21) in the axial direction, the second projection (46) having a second inner face (47) and a second outer face (48) with a second outer thread (49).

[0114] Example 4: The POD drive unit (1) of Example 3, wherein the movable part (23) comprises a third part end (50), a third projection (51) extending from the third part end (50) in the axial direction, the third protection (51) having a third outer face (52) with a third outer thread (53), and a fourth projection (54) extending from the third part end (50) in the axial direction, the fourth projection (54) being hollow and has a fourth inner face (55) with a fourth inner thread (56), the fourth projection (54) being arranged around the third projection (51) with a distance between them.

[0115] Example 5: The POD drive unit (1) of any of Examples 2-4, wherein the first part (21), the second part (22) and the movable part (23) are assembled so that the first inner thread (43) interacts with the third outer thread (53) and the second outer thread (49) interacts with the fourth inner thread (56) so that when the movable part (23) is moved in the axial direction, the first part (21) and the second part (22) are turned so that a phase shift between the first shaft (4) and the second shaft occur (6).

[0116] Example 6: The POD drive unit (1) of any of Examples 2-5, wherein one or more bearing(s) is / arranged between the first part and the second part and the movable part, respectively.

[0117] Example 7: The POD drive unit (1) of Example 6, wherein the bearing is a roller bearing, ball screw arrangement, or the like.

[0118] Example 8: The POD drive unit (1) of any of Examples 2-7, wherein the threads are formed as helical guides that may interact with each other.

[0119] Example 9: The POD drive unit (1) of Example 8, wherein the helical guides comprise helical grooves and helical protrusions or knobs being configured to interact.

[0120] Example 10: The POD drive unit (1) of any of Examples 2-9, wherein the threads or the helical guides which are not interacting have different helical angles or thread leads.

[0121] Example 11: The POD drive unit (1) of any of Examples 2-10, wherein the first inner thread and the third outer thread have a first helical angle or a first thread lead, and the second outer thread and the fourth inner thread have a second helical angle or a second thread lead, wherein the first helical angle or the first thread lead is different from the second helical angle or the second thread lead.

[0122] Example 12: The POD drive unit (1) of any of Examples 1-11, wherein an actuator (24) is arranged for moving the movable part (23) in the axial direction between the first position and the second position and any intermediate positions there between.

[0123] Example 13: The POD drive unit (1) of Example 12, wherein the actuator (24) is a motor, linear pneumatic or hydraulic cylinder, drive belt, or similar devices being able to move the movable part (23) in the axial direction.

[0124] Example 14: The POD drive unit (1) of any of Examples 1-13, further comprising a control unit (12) being operatively connected with the axial flux motor (3), the movable part (23) and / or the actuator (24).

[0125] Example 15: The POD drive unit (1) of Example 14, wherein the control unit (12) is configured to control the movable part (23) and / or the actuator (24) on basis of vessel data received from the marine vessel.

[0126] Example 16: The POD drive unit (1) of Example 15, wherein the vessel data relates to power consumption, modes of operation of the marine vessel, torque of the axial flux motor, load of the marine vessel, speed of the marine vessel, or a combination thereof.

[0127] Example 17: The POD drive unit (1) of Example 15 and / or 16, wherein the control unit (12) is configured to adjust the pitch angle of the pitchable propeller (5) on basis of the vessel data.

[0128] Example 18: The POD drive unit (1) of any of Examples 14-17, wherein the control unit (12) is configured to control the movable part (23) and / or the actuator (24) on basis of input data received from an input unit operated by an operator.

[0129] Example 19: The POD drive unit (1) of Example 18, wherein the control unit (12) is configured to adjust the pitch angle of the pitchable propeller (5) on basis of the input data.

[0130] Example 20: The POD drive unit (1) of any of Examples 1-19, wherein a coupling (14) is arranged between the first shaft (4), the second shaft (6) and the pitchable propeller (5) for changing a pitch angle of the pitchable propeller (5) when the phase shift between the first shaft (4) and the second shaft (6) occur.

[0131] Example 21: The POD drive unit (1) of Example 20, wherein the coupling (14) comprises a first gear (15) and a second gear (16), the first shaft (4) is directly connected to the first gear (15) and the second shaft (6) is directly connected to the second gear (16).

[0132] Example 22: The POD drive unit (1) of Example 20 and / or 21, wherein the pitchable propeller (5) has a plurality of propeller blades (17), each propeller blade (17) being connected to a blade gear (18).

[0133] Example 23: The POD drive unit (1) of any of Examples 20-22, wherein the pitchable propeller (5) has a first blade (17) and a second blade (17), the first blade is connected to a first blade gear (18) and the second blade (17) is connected to a second blade gear (18).

[0134] Example 24: The POD drive unit (1) of any of Examples 20-22, wherein the pitchable propeller (5) has a first blade, a second blade and a third blade, the first blade is connected to a first blade gear, the second blade is connected to a second blade gear and the third blade is connected to a third blade gear.

[0135] Example 25: The POD drive unit (1) of any of Examples 20-22, wherein the pitchable propeller (5) has a first blade, a second blade, a third blade and a fourth blade, the first blade is connected to a first blade gear, the second blade is connected to a second blade gear, the third blade is connected to a third blade gear and the fourth blade is connected to a fourth blade gear.

[0136] Example 26: The POD drive unit (1) of any of Examples 23-25, wherein the first gear (15) and the second gear (16) are connected to the blade gears (18).

[0137] Example 27: The POD drive unit of any of Examples 1-26, wherein the pitchable propeller (5) is foldable.

[0138] Example 28: The POD drive unit (1) of any of Examples 1-27, wherein the axial flux motor (3) is a permanent magnet synchronous motor.

[0139] Example 29: The POD drive unit (1) of Example 28, wherein the permanent magnet synchronous motor comprises rare-earth magnets.

[0140] Example 30: The POD drive unit (1) of any of Examples 14-29, wherein the control unit (12) is configured to precisely positioning the movable part (23).

[0141] Example 31: The POD drive unit (1) of Example 30, wherein the control unit (12) comprises a feedback loop for real-time monitoring and adjustment of the movable part (23).

[0142] Example 32: The POD drive unit (1) of any of Examples 1-31, wherein the axial flux motor (3) is arranged within the housing (2).

[0143] Example 33: The POD drive unit (1) of any of Examples 1-32, further comprising a cooling system for the axial flux motor (3).

[0144] Example 34: The POD drive unit (1) of Example 33, wherein the cooling system is a liquid cooling system.

[0145] Example 35: The POD drive unit (1) of any of Examples 1-34, further comprising a vibration dampening system to reduce noise and mechanical stress.

[0146] Example 36: The POD drive unit (1) of any of Examples 1-35, wherein the axial flux motor (3) is configured to operate at variable speeds for different marine conditions.

[0147] Example 37: The POD drive unit (1) of any of Examples 1-36, wherein the housing (2) comprises an integrated sensor system for monitoring operational parameters such as temperature, pressure, and rotational speed.

[0148] Example 38: A marine vessel (100) comprising a POD drive unit (1) of any of Examples 1-37.

[0149] Example 39: A method for pitching a pitchable propeller (5) of a POD drive unit (1) of any of Examples1-37, comprising connecting an axial flux motor (3) with a first shaft (4) for rotating a pitchable propeller (5), arranging a second shaft (6) concentric within the first shaft (4), the second shaft (6) being movable independently of the first shaft (4), the second shaft (6) having a first end (7) having a connection part (8) and a second end (9), arranging an adjustment device (20) comprising a first part (21) being connected with the first shaft (4), a second part (22) being connected with the connection part (8), and a movable part (23), moving the movable part (23) between a first position and a second position so as to turn the first part (21) and / or the second part (22) thereby providing a phase shift between the first shaft (4) and the second shaft (6) for pitching and / or folding the pitchable propeller (5).

[0150] Example 40: The method of Example 39, further comprising controlling the movable part (23) and / or an actuator (24) based on vessel data received from the marine vessel.

[0151] Example 41: The method of Example 40, wherein the vessel data includes parameters such as power consumption, modes of operation, torque of the axial flux motor, load of the marine vessel, speed of the marine vessel, or a combination thereof.

[0152] Example 42: The method of Example 40 or 41, further comprising adjusting the pitch angle of the pitchable propeller (5) based on the vessel data.

[0153] Example 43: The method of any of Examples 40-42, further comprising controlling the movable part (23) and / or the actuator (24) based on input data received from an input unit operated by an operator.

[0154] Example 44: The method of Example 43, wherein adjusting the pitch angle of the pitchable propeller (5) is based on the input data provided by the operator.

[0155] The terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises," "comprising," "includes," and / or "including" when used herein specify the presence of stated features, integers, actions, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, actions, steps, operations, elements, components, and / or groups thereof.

[0156] It will be understood that, although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the present disclosure.

[0157] Relative terms such as "below" or "above" or "upper" or "lower" or "horizontal" or "vertical" may be used herein to describe a relationship of one element to another element as illustrated in the Figures. It will be understood that these terms and those discussed above are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.

[0158] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0159] It is to be understood that the present disclosure is not limited to the aspects described above and illustrated in the drawings; rather, the skilled person will recognize that many changes and modifications may be made within the scope of the present disclosure and appended claims. In the drawings and specification, there have been disclosed aspects for purposes of illustration only and not for purposes of limitation, the scope of the disclosure being set forth in the following claims.

Claims

1. A POD drive unit for a marine vessel, comprisinga housing,an axial flux motor connected with a first shaft for rotating a pitchable propeller, a second shaft arranged concentric within the first shaft, the second shaft being movable independently of the first shaft, the second shaft having a first end having a connection part and a second end,an adjustment device comprising a first part being connected with the first shaft, a second part being connected with the connection part, and a movable part,wherein the movable part is configured to be moved between a first position and a second position so as to turn the first part and / or the second part thereby providing a phase shift between the first shaft and the second shaft for pitching and / or folding the pitchable propeller.

2. The POD drive unit of claim 1, wherein the first part comprises a first part end being connected with the first shaft and a first projection extending from the first part in an axial direction, the first projection having a first inner face with a first inner thread and a first outer face.

3. The POD drive unit of claim 2, wherein the second part comprises a second part end being connected with the second shaft and a second projection extending from the second part in the axial direction, the second projection having a second inner face and a second outer face with a second outer thread.

4. The POD drive unit of claim 3, wherein the movable part comprises a third part end, a third projection extending from the third part end in the axial direction, the third protection having a third outer face with a third outer thread, and a fourth projection extending from the third part end in the axial direction, the fourth projection being hollow and has a fourth inner face with a fourth inner thread, the fourth projection being arranged around the third projection with a distance between them.

5. The POD drive unit of claim 2, wherein the first part, the second part and the movable part are assembled so that the first inner thread interacts with the third outer thread and the second outer thread interacts with the fourth inner thread so that when the movable part is moved in the axial direction, the first part and the second part are turned so that a phase shift between the first shaft and the second shaft occur.

6. The POD drive unit of claim 2, wherein the first inner thread and the third outer thread have a first helical angle or a first thread lead, and the second outer thread and the fourth inner thread have a second helical angle or a second thread lead, wherein the first helical angle or the first thread lead is different from the second helical angle or the second thread lead.

7. The POD drive unit of claim 1, wherein an actuator is arranged for moving the movable part in the axial direction between the first position and the second position and any intermediate positions there between.

8. The POD drive unit of claim 7, wherein the actuator is a motor, linear pneumatic or hydraulic cylinder, drive belt, or similar devices being able to move the movable part in the axial direction.

9. The POD drive unit of claim 1, further comprising a control unit being operatively connected with the axial flux motor, the movable part and / or the actuator.

10. The POD drive unit of claim 9, wherein the control unit is configured to control the movable part and / or the actuator on basis of vessel data received from the marine vessel.

11. The POD drive unit of claim 10, wherein the vessel data relates to power consumption, modes of operation of the marine vessel, torque of the axial flux motor, load of the marine vessel, speed of the marine vessel, or a combination thereof.

12. The POD drive unit of claim 10, wherein the control unit is configured to adjust the pitch angle of the pitchable propeller on basis of the vessel data.

13. The POD drive unit of claim 1, wherein a coupling is arranged between the first shaft, the second shaft and the pitchable propeller for changing a pitch angle of the pitchable propeller when the phase shift between the first shaft and the second shaft occur.

14. The POD drive unit of claim 13, wherein the coupling comprises a first gear and a second gear, the first shaft is directly connected to the first gear and the second shaft is directly connected to the second gear.

15. The POD drive unit of claim 13, wherein the pitchable propeller has a plurality of propeller blades, each propeller blade being connected to a blade gear.

16. The POD drive unit of claim 14, wherein the first gear and the second gear are connected to the blade gears.

17. The POD drive unit of claim 9, wherein the control unit is configured to precisely positioning the movable part.

18. The POD drive unit of claim 17, wherein the control unit comprises a feedback loop for real-time monitoring and adjustment of the movable part.

19. A marine vessel comprising a POD drive unit of claim 1.

20. A method for pitching a pitchable propeller of a POD drive unit of claim 1, comprising connecting an axial flux motor with a first shaft for rotating a pitchable propeller, arranging a second shaft concentric within the first shaft, the second shaft being movable independently of the first shaft, the second shaft having a first end having a connection part and a second end,arranging an adjustment device comprising a first part being connected with the first shaft, a second part being connected with the connection part , and a movable part,moving the movable part between a first position and a second position so as to turn the first part and / or the second part thereby providing a phase shift between the first shaft and the second shaft for pitching and / or folding the pitchable propeller.

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