Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
  • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
  • B63H25/06—Steering by rudders
  • B63H25/08—Steering gear
  • B63H25/14—Steering gear power assisted; power driven, i.e. using steering engine
  • B63H25/18—Transmitting of movement of initiating means to steering engine
  • B63H25/24—Transmitting of movement of initiating means to steering engine by electrical means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
  • B63B39/04—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using gyroscopes directly
• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
  • G05D1/00—Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots
  • G05D1/08—Control of attitude, i.e. control of roll, pitch, or yaw
  • G05D1/0875—Control of attitude, i.e. control of roll, pitch, or yaw specially adapted to water vehicles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
  • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
  • B63B2039/065—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water the foils being pivotal about an axis substantially parallel to the longitudinal axis of the vessel
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
  • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
  • B63B2039/067—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water effecting motion dampening by means of fixed or movable resistance bodies, e.g. by bilge keels

Definitions

• the present invention relates to stabilizers for vessels, and more specifically to stabilizers used to reduce roll at anchor and/or when cruising, where the stabilizers have fins, trim tabs or any other shape that may contribute to the stabilization of the vessel when rotated.
• fin stabilizers have been operated by hydraulics. However, with advances in technology, electric operation of stabilizers seems to become more common. Electrically powered stabilizers have advantages, especially at anchor since they can be driven by an on-board battery.
• a further problem with prior art stabilizers is that it is challenging to perform modifications to the stabilizer unit after installation in the boat.
• the stabilizer is installed through the hull of the boat, and permanently fixed to the hull.
• Replacement may require cutting the hull around the present installation and re-making the hull to make it fit the replacement stabilizer. Modifications or replacements may be needed e.g., if a different torque is needed to improve stabilizer performance. This may be related to the use of different fin types.
• the size of the stabilizer with regards to its stabilizing capabilities, i.e. torque should preferably be reduced with regards to prior art, especially in the direction perpendicular to the bottom of the hull.
• a goal with the present invention is to overcome the problems of prior art, and to disclose an improved vessel stabilizer.
• the invention is a vessel stabilizer according to the independent claims. 3
• the stabilizer may be more fail safe in certain situations.
• FIG. 1 illustrates in a perspective view from above a vessel stabilizer (1) according to an embodiment of the invention.
• the inner part (11) and outer part (12) of the base unit (10) are fixed to the hull of the vessel.
• the drive unit (20) is vibrationally floating inside the base unit.
• Fig. 2 illustrates in a perspective view from below the same vessel stabilizer (1) as in Fig. 1.
• Fig. 3 is a cross sectional view of the vessel stabilizer (1) illustrated in Fig. 1. Elements with similar hatching are, at least in some respects, mechanically fixed to each other and may rotate or otherwise move with respect to each other.
• the drive unit (20) is vibrationally floating inside the base unit (10), the output element (221) and the inner shaft (212) rotate inside the drive unit (20), although with different speed.
• Fig. 4a illustrates in a cross section view a detail of the vessel stabilizer (1) illustrated in Fig. 1, where the drive unit (20) is arranged vibrationally floating inside the base unit (10).
• Fig. 4b illustrates in a cross section view a detail of the vessel stabilizer (1), in a further embodiment that may be combined with the embodiment in Fig. 4a, where the vessel stabilizer (1) comprises one or more second support elements (32) configured to prevent excessive compression of the first and/or second insulation element (30, 40) in the vertical direction, and one or more third support elements (33) configured to prevent 4 excessive movement of the drive unit (10) relative to the base unit (10) in the radial direction.
• the vessel stabilizer (1) comprises one or more second support elements (32) configured to prevent excessive compression of the first and/or second insulation element (30, 40) in the vertical direction, and one or more third support elements (33) configured to prevent 4 excessive movement of the drive unit (10) relative to the base unit (10) in the radial direction.
• Fig. 5 illustrates in an exploded perspective view from above of the vessel stabilizer of Fig. 1, the main elements for arranging the base unit (10) in the hull (100) and for arranging the drive unit (20) in the base unit (10).
• Fig. 6 illustrates in illustrates in an exploded perspective view from above of the vessel (1) stabilizer of Fig. 1, the inner and outer parts (21, 22) of the drive unit (20), and how the inner part (21) easily can be removed and inserted into the outer part (22) from the inside of the hull without removing the base unit (10) or the stabilizer element, e.g. the fin, from the hull.
• Fig. 7 is a cross-section view, perpendicular to the cross-section view in Fig. 3, illustrating among other elements, the locking elements (225) arranged to lock the output element, and the stabilizer element to the lower inner part (220) of the drive unit (20) in an emergency situation, or when performing maintenance operations when the hull is submerged in water.
• vessel used in this document are meant to cover all ships, boats, and installations floating on water.
• vibrationally floating means that one element, e.g., the base unit (10) is not exposed to all the mechanical oscillations of another element e.g., the drive unit (20).
• the terms vibrationally damped or vibrationally insulated may be interchangeably used. 5
• the invention is a vessel stabilizer (1) comprising;
• a base unit (10) configured to be fixedly mounted to a hull (100) of the vessel
• a drive unit (20) comprising a motor (211) and an output element (221), wherein the motor (211) is configured to rotationally drive the output element (221) and the output element (221) is configured to be fixed to a stabilizer element outside the hull, and
• first insulation element (30) arranged between the base unit (10) and the drive unit (20), wherein the base unit is vibrationally insulated from the drive unit by the first insulation element (30).
• the hull base (10) has a through hole for the drive section (20) and a first base surface (18) around the through hole, wherein the drive section (20) comprises a first drive surface (28) along the perimeter of the drive unit, wherein
• the first insulation element (30) is arranged between the first base surface (18) and the first drive surface (28).
• the first base surface (18) and the first drive surface (28) are overlapping in a cross-sectional view perpendicular to a rotational axis of the output element (221).
• the vessel stabilizer comprises;
• the hull base (10) has a through hole for the drive section (20) and a first base surface (18) around the through hole, wherein the drive section (20) comprises a second drive surface (28) along the perimeter of the drive unit, 6 wherein
• the second insulation element (40) is arranged between the second base surface (19) and the second drive surface (29).
• the second base surface (19) and the second drive surface (29) are al view in a cross section perpendicular to a rotational axis of the output element (221).
• first and second base surfaces (18, 19) face in opposite directions.
• first and second drive surfaces face in opposite directions.
• the base unit (10) comprises a first base protrusion (11a) and the drive unit comprises a first drive protrusion (21a), wherein the first insulation element (30) is delimited by the first base protrusion in a first radial direction and by the first drive protrusion in the opposite direction, wherein the first base protrusion and the first drive protrusion are arranged in first and second planes perpendicular to the axial direction of the output element (221), and not in contact with the first insulation element (30) in the region between the first and second planes.
• the base unit (10) comprises a second base protrusion (lib) and the drive unit comprises a second drive protrusion (21b), wherein the second insulation element (40) is delimited by the second base protrusion in a first radial direction and by the second drive protrusion in the opposite direction, wherein the second base protrusion and the second drive protrusion are arranged in third and fourth planes perpendicular to the axial direction of the output element (221), and not in contact with the second insulation element (40) in the region between the third and fourth planes.
• the above feature may have the effect of reducing the structure-borne energy by as much as 70 - 80%, and obviously have a large impact on resonance from the structure-borne energy in various locations aboard the vessel. 7
• any of the first base protrusion, second base protrusion, first drive protrusion and second drive protrusion are inclined in the axial direction of the output element (221), to simplify assembly.
• the vessel stabilizer comprises one or more first support elements (31), arranged in grooves or slits facing each other in the base unit (10) and the drive unit (20) in a plane perpendicular to a rotational axis of the output element.
• the one or more first support elements (31) supports the drive unit (20) rotationally as well as radially with regards to the base unit (10).
• a stiffness between the drive unit (20) and the base unit (10) is configured to increase with increasing torque on the drive unit relative to the base unit (10) in the axial or vertical direction.
• the vessel stabilizer comprises one or more second support elements (32), wherein the one or more second support element (30, 40) has a higher stiffness than the first and or second insulation element (30, 40).
• the one or more second support elements (32) are configured to prevent excessive compression of the first and/or second insulation element (30, 40) and to ensure that the drive unit (20) cannot touch the base unit (10) for large vertical, or axial, forces acting on the stabilizer.
• the one or more second support elements (32) are arranged integrated with the first and/or second insulation element (30, 40).
• the height of the one or more second support elements (32) is lower than the height of the first and/or second insulation element (30, 40).
• the one or more second support elements (32) are ring shaped.
• a stiffness between the drive unit (20) and the base unit (10) is configured to increase with increasing torque on the drive unit relative to the base unit (10) in the radial direction.
• the vessel stabilizer comprises one or more third support elements (33), wherein the one or more third support elements (30, 40) has a higher stiffness than the one or more first support elements (31).
• the one or more third support elements (33) are configured to prevent excessive movement of the drive unit (10) relative to the base unit (10) in the radial direction and to ensure that the drive unit (20) cannot touch the base unit (10) for large radial forces acting on the stabilizer.
• the one or more third support elements (33) are arranged integrated with the one or more first support elements (31).
• the width of the one or more third support elements (33) is smaller than the width of the one or more first support elements (31), in a cross section.
• the one or more third support elements (33) are ring shaped.
• Any of the second or third support elements can be made in e.g., Polyoxymethylene (POM).
• POM Polyoxymethylene
• the drive unit is arranged vibrationally floating on the first and/or second insulation element (30, 40) with respect to the base unit.
• the first/and or second insulation element (30, 40) is/are configured to be arranged permanently compressed between the drive unit (20) and the base unit (10).
• the first insulation element (30) is compressed according to any of the following ranges; 30 - 80%, 40 - 70% or 50 - 60% of its static load limit.
• the vessel stabilizer (1) comprises pre-tensioning means (22) configured to keep the first and/or second insulation element (30, 40) compressed in the axial direction of the output element (221) when the drive section (20) is arranged through the hull base (10).
• the drive unit (20) comprises an inner part (21) and an outer part (22) wherein the second drive surface (29) is arranged on a flange of the inner part and the first drive surface (28) is arranged on a flange of the outer part, wherein the inner and outer parts are configured to be forced together and fastened.
• the base unit (10) comprises an inner part and an outer part wherein the second base surface is arranged on a flange of the inner part and the first base surface is arranged on a flange of the outer part, wherein the inner and outer parts are configured to be forced together and fastened.
• any of the first base surface, second base surface, first drive surface and second drive surface comprise one or more ring-formed protrusions.
• the first and/or second insulation element (30, 40) is/are made from a polyurethan elastomer with a closed cellular pore structure.
• the first and/or second insulation element (30, 40) is/are made in vibrationally damping material configured to reduce the impact generated and steady state noise from the electric actuator.
• Vibrationally damping materials may be e.g.; Rubber, Polyurethane, Polyvinyl chloride, alone or in combination with other damping materials and as part of a composite vibrational damping structure.
• the first and/or second insulation element (30, 40) is/are made from a polyurethan elastomer with a closed cellular pore structure.
• the first and/or second insulation element (30, 40) is/are integrated with the base unit (10) or the drive unit (20).
• the vessel stabilizer (1) comprises an insulation block comprising the first and/or second insulation element (30, 40), wherein the insulation block is configured to be fixed to the base unit (10) and the drive unit (20).
• the insulation block may be factory molded. Different insulation blocks may have different damping and strength characteristics, while still sharing physical dimensions.
• the vessel stabilizer (1) comprises the features of any of the embodiments EA1 to EA5 below.
• the invention is a vessel stabilizer (1) comprising;
• strain wave gear system comprising a wave generator (231), a flexible spline (232) and a fixed spline (233), wherein the drive unit (20) comprises
• the fixed spline (233) is fixed to the output element (221), and the upper inner part (210) is configured to be removably assembled to the lower inner part (220) from inside the hull.
• the upper inner part (210) is fixed to the lower inner part (220) with bolts.
• the output element (221) is rotationally supported by upper and lower bearings (222, 223) arranged in the lower inner part (220) of the drive unit (20), and the wave generator (231) is arranged between the upper and lower bearings (222, 223) when the drive unit (20) is assembled.
• the upper inner part (210) comprises an inner shaft (212) comprising a rotor section (212a) with extended diameter fixed to a rotor (211a) of the electric motor (211), wherein the inner shaft is further fixed to the wave generator (231), wherein the inner shaft (212) is supported in the upper inner part (210) by upper and middle rotational bearings (213 ,214 ) arranged above and below the rotor section (212a).
• the inner shaft (212) is supported in the lower inner part (220) by a lower rotational bearing (215) arranged below the wave generator 11
• the upper inner part (220) comprises a retaining ring, arranged below the lower bearing, and configured to longitudinally lock the wave generator (231) and lower bearing to the inner shaft (212).
• the vessel stabilizer (1) comprises;
• the drive unit (20) is configured to be removably assembled vibrationally floating with respect to the base unit (10).
• the upper inner part (210) comprises a brake element (216) arranged on the inner shaft (212) between the wave generator (231) and the rotor section (212a) and configured to act on the lower side of the rotor section to brake or lock the inner shaft as needed.
• the brake element is electrically operated and normally on.
• the vessel stabilizer (1) comprises a locking element (225) configured to lock the output element (221) to the lower inner part (220) to prevent rotation of the stabilizer element.
• the locking element (225) and output element (221) comprises teeth that mesh when the locking element (225) is operated.
• the locking element (225) is arranged in a slot of the lower inner part (220) and arranged to move radially when operated.
• the vessel stabilizer (1) comprises the features of any of the embodiments EMI to EM7 above.
• the stabilizer element is configured to extend below the hulls water line, and it may typically have the shape of a fin, a trim tab or any other shape that may contribute to the stabilization of the vessel when rotated. 12
• Fig. 1 and 2 illustrate the assembled vessel stabilizer (1) in two different perspective views.
• the drive unit (20) extends through the base unit (10).
• FIG. 3 where the main components of the vessel stabilizer can be seen in a section view.
• the vessel stabilizer comprising both the base unit and the drive unit may be pre-assembled and ready to be mounted in the vessel.
• the base unit (10) In a circular through hole of the hull (100) the base unit (10) is fixedly mounted.
• the base unit (10) comprises an inner circular part (11) fitting into the through hole of the hull (100) with a circular flange that covers the inside of the hull, radially outside the perimeter of the hole.
• the base unit (10) further comprises an outer circular part (12) in the form of a ring- shaped disk that covers the outside of the hull outside the perimeter of the hole, and facing the circular flange on the opposite side of the hull.
• the base unit is mounted to the hull by first entering the inner part through the hull from the inside of the vessel, mounting the outer part from outside, and securing the two parts to each other with bolts. Further a sealing material is injected through openings to inside to make sure the base unit is thoroughly sealed to the hull. The necessary electrical connections for power and control are established and a fin or a foil (not shown) is then mounted outside the hull to the output element (221) of the vessel stabilizer.
• the base unit (10) comprises a through hole and first and second ring-shaped base surfaces (18, 19), respectively directed inwardly and outwardly with regards to the hull.
• the drive unit (20) is arranged through the through hole in the base unit (10) and fixed to the base unit (10) along its perimeter as explained further below.
• the drive unit (10) comprises an inner circular part (21) fitting into the through hole of the base unit (10) where the outer diameter of the inner circular part (21) is smaller than the inner diameter of the through hole of the base unit (10).
• the inner part (21) of the drive unit (10) has a circular flange that covers the inside of the base unit, radially outside the perimeter of the hole through the base unit.
• the drive unit (20) further comprises a circular outer part (22) in the form of a ring- shaped disk that covers the outside of the base unit (10) radially outside the perimeter of the hole through the base unit, and facing the circular flange on the opposite side of the hull.
• the inner and outer parts are arranged adjacent each other and secured with bolts. 13
• the circular flange of the inner circular part (21) has a circular first drive surface (28) facing towards the first base surface (18), and a circular open-ring shaped first insulation element (30) is arranged between the two surfaces to isolate the drive unit from the base unit.
• a similar second insulation element (4) is arranged between the second ring shaped base surface (19) and a circular ring shaped second drive surface (29) of the circular flange of the inner circular part (21).
• the first and second nose reduction elements (30) are made in elastomer with a closed cellular pore structure. Further, the first and second nose reduction elements (30) are compressed when the first and second drive surfaces are forced towards each other by mounting the outer part (22) to the inner part (21) of the drive unit.
• the base unit (10) and the drive section (20) interface the first and second compressible elements (30, 40) from different sides, to easy assembly. However, they do not interface the first and second compressible elements (30, 40) in the same plane, where the plane here is in the radial direction.
• the protrusions may be inclined to ease mounting.
• the first base surface and the first drive surface (18, 28) comprises in this embodiment circular protrusions that, when pre-tensioned, further contribute in sealing the inside of the hull from the outside of the hull in the interface between the base unit and the drive unit.
• the vessel stabilizer comprises four first support elements (31), arranged between the inner part of the base unit (10) and the inner part of the drive unit (20), both comprising grooves or slits to fit the first support elements (31).
• the first support elements are made in elastomer. 14
• the present arrangement significantly reduces vibrations in the hull caused by operation of the stabilizer, which in turn reduces the audible noise.
• the solution can handle large forces that are present when the fin or foil is rotated opposite the roll or pitch directions. I.e., the rotational torque around the fin shaft will try to rotate the drive unit with regards to the base unit. In addition, a torque perpendicular to the fin shaft will attempt to rotate the drive unit, resulting in a lift one side of the drive unit and a compression on the opposite side. Without the elements of the invention, the described torques could lead to sudden unalignments reducing efficiency of noise reduction, and even worse causing structural damages and water penetration.
• the inner part (21) of the drive unit (20) itself can be split for easy maintenance or upgrade of the electric motor and the reduction gear as illustrated in Fig. 5. This can be achieved from the inside of the hull without removing the drive unit (20) from the base unit (10).
• the inner part (21) comprises a lower inner part (220) and an upper inner part (210) that are bolted together in normal operation.
• the upper inner part (210) can be lifted away from the lower inner part (220), when the lower inner part is still fixed to the base unit (10), as seen in Fig. 6. If this operation is performed at sea, the fin should initially be secured relative to the hull by screwing the locking elements (225) normally hidden in slots in the lower inner part (220) radially inward until the teeth of the locking elements (225) mesh with the teeth of the output element (221)
• the upper inner part comprises an electric motor (211) while the lower inner part (220) comprises the output element (221).
• the drive unit comprises a strain wave gear system (23) comprising a wave generator (231), a flexible spline (232) and a fixed spline (233).
• the wave generator is coaxially connected to the rotor of the electric motor (211) above, while the fixed spline (233) is coaxially connected to the output element (221) below.
• the output element (221) is rotationally supported by upper and lower bearings (222, 223) arranged in the lower inner part (220) of the drive unit (20), and the fixed spline is arranged inside the output element (221) between the upper and lower bearings (222, 223).
• the inner drive unit comprises an inner shaft (212) interconnecting the rotor (211a) of the electric motor (211) and the wave generator (231).
• the rotor is arranged on a rotor section of the inner shaft with an extended diameter.
• Above and below the rotor section the inner shaft is supported by rotational bearings in the upper inner part (210), such that the inner shaft is always aligned with the upper inner part, also when the upper 15 inner part is split from the lower inner part (220). This makes assembling or re-assembling the upper inner part and the lower inner part easier.
• a lower rotational bearing (213) is arranged and longitudinally fixed at the lower end of the inner shaft by a retaining ring, below the wave generator.
• the lower rotational bearing will be supported by the fixed spline (233) once the upper and lower inner parts are assembled.
• a brake element (216) is arranged on the inner shaft between the wave generator and the rotor section and is configured to act on the lower side of the rotor section to brake or lock the inner shaft as needed.
• the brake element is normally locked, i.e., it is active when power is off.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Physics & Mathematics (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Aviation & Aerospace Engineering (AREA)
• General Physics & Mathematics (AREA)
• Automation & Control Theory (AREA)
• Motor Or Generator Frames (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Centrifugal Separators (AREA)
• Glass Compositions (AREA)
• Vibration Prevention Devices (AREA)

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• 2021
  • 2021-08-02 NO NO20210955A patent/NO346599B1/en unknown
• 2022
  • 2022-07-21 US US18/294,905 patent/US20240336336A1/en active Pending
  • 2022-07-21 WO PCT/NO2022/050181 patent/WO2022240297A2/en not_active Ceased
  • 2022-07-21 ES ES22751467T patent/ES3058962T3/es active Active
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