EP2452870A1 - Device for watercrafts - Google Patents
Device for watercrafts Download PDFInfo
- Publication number
- EP2452870A1 EP2452870A1 EP11181881A EP11181881A EP2452870A1 EP 2452870 A1 EP2452870 A1 EP 2452870A1 EP 11181881 A EP11181881 A EP 11181881A EP 11181881 A EP11181881 A EP 11181881A EP 2452870 A1 EP2452870 A1 EP 2452870A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stabilizing
- watercraft
- appendage
- unit
- longitudinal axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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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
- 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
Definitions
- the present invention relates to a stabilizing unit for a watercraft, comprising a stabilizing appendage located below the water line of the watercraft.
- the present invention relates to a stabilizing unit for stabilizing the trim of a stationary or moving watercraft, mainly for lateral trim stabilization, to reduce rolling, i.e. the oscillating motion of the watercraft about its longitudinal axis.
- watercraft stabilizing unit of the present invention is also used for controlling bearing appendages of the watercraft, such as flaps for longitudinal trim control
- watercraft lateral trim stabilizing appendages i.e. stabilizing fins
- Watercrafts are known to be normally subjected to a movement about their longitudinal axis, known as rolling, caused by current, wave action, wind, or else, both when navigating and when lying at anchor.
- Stabilizer devices or elements are known for controlling watercraft lateral trim, which comprise a wing surface, commonly known as fin, generally located below the hull at the longitudinal position of the center of gravity thereof.
- the fin may be rotated about a longitudinal axis perpendicular to the surface of the watercraft hull. By changing the angle of attack of the fin relative to the incident water flow, a variable lift is generated, which counteracts rolling and hence controls the lateral trim of the watercraft.
- the fin is generally connected through a shaft to an actuator which is located within a rudder hole formed in the hull, which rotates such shaft and thus causes the rotation of the fin and hence changes the angle of attack and the lift.
- Such actuator is typically operated through a hydraulic circuit comprising a reservoir, one or more pumps, control valves and a pair of hydraulic cylinders.
- a second type of lateral trim control devices for watercrafts in which the fin is actuated by an motor coupled to an epicyclic reduction gear, with a crown wheel and pinion for 90° power transmission, or by an motor coupled to a parallel-axes gear.
- the problem to be solved by the present invention is to provide a device for controlling a stabilizing appendage for a watercraft, that is light, compact, simple to install and reliable, in which the motor members are always easily accessible for any maintenance or replacement requirement, and are not subjected to stresses that can affect their proper operation with time, while obviating the above mentioned drawbacks of the prior art.
- numeral 10 generally designates a stabilizing unit of the present invention, which is used to control the lateral trim of a watercraft.
- the stabilizing unit 10 comprises a support assembly 29 mounted in the rudder hole 25, a motor unit 11 installed in the watercraft at the upper part of the support assembly 29, an airfoil stabilizer fin 12, namely made of glass-reinforced plastic, located outside the watercraft, actuator means 40, operatively connected to the motor unit 11, and extending from the interior to the exterior of the watercraft to connect the motor unit 11 to the stabilizer fin 12, and a locking unit 41 located adjacent the motor unit 11 opposite to the stabilizer fin 12.
- the support assembly 29 comprises an annular element 37 having a plurality of first holes and a plurality of second holes, not shown, around its circumference.
- the first holes are used to fix the annular element 37 to the motor unit 11 by screws 38, whereas the second holes are used to fix the annular element 37 to the rudder hole 25 by bolts 39.
- the motor unit 11 comprises a stator 14 and a rotor 15, which are installed in a housing case 36, appropriately shaped to be mounted to the support assembly 29 by means of the screws 38.
- the electric motor is a synchronous torque motor (TORQUE MOTOR) with a large number of poles of pulse-controlled stepper type and operated by inverter.
- This motor is a three-phase alternating-current electric motor.
- this electric motor is particularly advantageous in this type of application, in which the stabilizer fin 12 is not required to be rotated at high speed, but at low speed, e.g. not faster than 70 revolutions/minute, preferably not faster than 40 revolutions/minute.
- the low rpm of the above mentioned electric motor can avoid the presence of a mechanical rpm reducer interposed in the kinematic chain for transferring motion from the rotor 15 of the electric motor to the stabilizer fin 12, thereby avoiding the above mentioned prior art problems.
- such electric motor can be operated by energizing its windings with appropriate pulses not only to rotate the rotor 15, but also to transfer a sufficient torque thereto, to counteract a retrograde motion transferred to the rotor 15 by the stabilizer fin 12 due to the lift generated by the water flow impinging on the stabilizer fin.
- the actuator means 40 comprise an actuator shaft 13, which is directly axially coupled to the rotor 15, and is rotated by it.
- the actuator shaft 13 has a first end that forms, i.e. directly defines the rotor 15 of the electric motor and a second end that is integrally and rotatably coupled to the stabilizer fin 12 to rotate it about said longitudinal axis X-X of rotation, the actuator shaft 13 extending parallel and as an extension of the longitudinal axis X-X of rotation.
- the actuator shaft has a first end integrally and rotatably coupled, e.g. by flanged connection, to the rotor of the electric motor and a second end integrally and rotatably coupled to the stabilizer fin to rotate it about the longitudinal axis of rotation, the actuator shaft extending parallel and as an extension of the longitudinal axis X-X of rotation.
- the actuator means further include a bearing 30 and a bush 21, which are disposed coaxial with the actuator shaft 13 in the area within the rudder hole 25.
- the bearing 30 and the bush 21 absorb the stresses applied by the loads generated by the stabilizer fin 12 and transferred to the actuator shaft 13, thereby assisting rotation thereof.
- the bush 21 is made of bronze. However, it can be also made of another metal material, provided it can withstand the above mentioned stresses. According to a variant, first and second bearings are used to absorb the stresses generated by the stabilizer fin 12, which bearings are mounted to the upper surface and the lower surface of the annular element 37 respectively.
- an elastic joint may be interposed between the rotor 15 and the actuator shaft 13 or the stabilizer fin 12, for reducing the dynamic stresses transferred to the torque electric motor and allow the use of a larger fin with the same power of the installed electric motor.
- the stabilizing unit of the invention comprises encoder detection means associated with the actuator means 40 to detect the angular position of the stabilizer fin 12 relative to the longitudinal axis X-X of rotation, thereby allowing accurate determination of its position.
- two gaskets 22 and an O-ring seal 23 are provided at the lower portion of the rudder hole 24, and an O-ring seal 24 is provided at the contact portion between the annular element 37 and the rudder hole 25.
- the stabilizer fin 12 is coupled to the lower end portion of the actuator shaft 13 by a conical coupling.
- fastening means comprise a tie rod 17, cooperating between the lower edge of the actuator shaft 13 and the base of the stabilizer fin 12, and a key 16, which extends from the lower portion of the actuator shaft 13 to the base of the stabilizer fin 12 and is fastened thereto by a washer 19, a spring washer 18 and a self-locking nut 20.
- the watercraft comprises:
- the rotation of the actuator shaft 13 moves the stabilizer fin 12, thereby changing the angle between the latter and the impinging flow and generating, as a result, a lift that counteracts the rolling motion of the moving or stationary watercraft.
- the rotor of the torque motor is appropriately sized to ensure the torque required for rotation of the stabilizing appendage.
- the stabilizing unit of the present invention affords both dramatically shorter response times as compared with those of an epicyclic reduction gear and a considerably improved accuracy in airfoil control due to the elimination of any clearance.
- the stabilizing unit of the present invention has a light weight, a compact size, simple installation and low cost.
- the stabilizing unit of the present invention is more reliable than prior art devices, as it has a smaller number of parts susceptible to wear and breaking.
- the stabilizing unit of the invention uses no contaminating fluid element, such as the oil of hydraulic devices, it involves no risk for the marine environment.
- the stabilizing unit can be easily installed on watercrafts both on and off the stocks and is easily accessible for maintenance and/or replacement.
- Figures 5 and 6 show a variant of the stabilizing unit 10 in which:
- the drive unit 102 comprises a piston 103 connected to a slider-crank assembly 104 which rotates the shaft 105 pivoted on the stabilizer fin 12 at the above mentioned transverse axis.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI2010A001688A IT1401941B1 (it) | 2010-09-17 | 2010-09-17 | Dispositivo per imbarcazioni |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2452870A1 true EP2452870A1 (en) | 2012-05-16 |
Family
ID=43738910
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11181881A Withdrawn EP2452870A1 (en) | 2010-09-17 | 2011-09-19 | Device for watercrafts |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2452870A1 (it) |
IT (1) | IT1401941B1 (it) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016069859A1 (en) | 2014-10-29 | 2016-05-06 | Naiad Maritime Group, Inc. | Electric fin stabilizer |
WO2016188963A1 (en) * | 2015-05-22 | 2016-12-01 | Humphree Ab | An adjustable device and a boat provided with a stabilizing device |
US10040521B2 (en) | 2015-02-17 | 2018-08-07 | Elisabeth Fournier | Ship stabilizer system |
IT201700084257A1 (it) * | 2017-07-24 | 2019-01-24 | Cmc Marine S R L | Sistema di stabilizzazione di una imbarcazione |
IT201700084238A1 (it) * | 2017-07-24 | 2019-01-24 | Cmc Marine S R L | Sistema di stabilizzazione di una imbarcazione |
IT201700084215A1 (it) * | 2017-07-24 | 2019-01-24 | Cmc Marine S R L | Sistema di stabilizzazione di una imbarcazione |
WO2019021094A1 (en) * | 2017-07-24 | 2019-01-31 | Cmc Marine S.R.L. | STABILIZATION SYSTEM FOR NAUTICAL EQUIPMENT |
US10946942B2 (en) | 2017-12-15 | 2021-03-16 | Naiad Maritime Group, Inc. | Fin stabilizer |
DE102020208770A1 (de) | 2020-07-14 | 2022-01-20 | Skf Marine Gmbh | Vorrichtung |
US11685485B2 (en) | 2017-12-15 | 2023-06-27 | Naiad Maritime Group, Inc. | Fin stabilizer |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB802105A (en) * | 1954-10-13 | 1958-10-01 | Deutsche Werft Ag | Improvements in or relating to devices for damping the rolling movement of ships |
GB1201211A (en) * | 1967-01-24 | 1970-08-05 | Blohm Voss Ag | Ships stabilisers |
EP2172394A1 (en) * | 2008-10-02 | 2010-04-07 | CMC Marine S.r.l. | Automatic anti-roll stabilization system of a watercraft |
-
2010
- 2010-09-17 IT ITMI2010A001688A patent/IT1401941B1/it active
-
2011
- 2011-09-19 EP EP11181881A patent/EP2452870A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB802105A (en) * | 1954-10-13 | 1958-10-01 | Deutsche Werft Ag | Improvements in or relating to devices for damping the rolling movement of ships |
GB1201211A (en) * | 1967-01-24 | 1970-08-05 | Blohm Voss Ag | Ships stabilisers |
EP2172394A1 (en) * | 2008-10-02 | 2010-04-07 | CMC Marine S.r.l. | Automatic anti-roll stabilization system of a watercraft |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10246170B2 (en) | 2014-10-29 | 2019-04-02 | Naiad Maritime Group, Inc. | Electric fin stabilizer |
EP3212497A4 (en) * | 2014-10-29 | 2018-07-11 | Naiad Maritime Group, Inc. | Electric fin stabilizer |
WO2016069859A1 (en) | 2014-10-29 | 2016-05-06 | Naiad Maritime Group, Inc. | Electric fin stabilizer |
US10040521B2 (en) | 2015-02-17 | 2018-08-07 | Elisabeth Fournier | Ship stabilizer system |
WO2016188963A1 (en) * | 2015-05-22 | 2016-12-01 | Humphree Ab | An adjustable device and a boat provided with a stabilizing device |
EP3298302B1 (en) | 2015-05-22 | 2019-10-16 | Humphree AB | An adjustable device and a boat provided with a stabilizing device |
US10322778B2 (en) | 2015-05-22 | 2019-06-18 | Humphree Ab | Adjustable device and a boat provided with a stabilizing device |
IT201700084257A1 (it) * | 2017-07-24 | 2019-01-24 | Cmc Marine S R L | Sistema di stabilizzazione di una imbarcazione |
WO2019021094A1 (en) * | 2017-07-24 | 2019-01-31 | Cmc Marine S.R.L. | STABILIZATION SYSTEM FOR NAUTICAL EQUIPMENT |
IT201700084215A1 (it) * | 2017-07-24 | 2019-01-24 | Cmc Marine S R L | Sistema di stabilizzazione di una imbarcazione |
IT201700084238A1 (it) * | 2017-07-24 | 2019-01-24 | Cmc Marine S R L | Sistema di stabilizzazione di una imbarcazione |
CN111386223A (zh) * | 2017-07-24 | 2020-07-07 | Cmc船舶有限责任公司 | 用于船只的稳定系统 |
EP3658453B1 (en) | 2017-07-24 | 2021-12-01 | CMC Marine S.r.l. | Stabilization system for a watercraft |
US11198492B2 (en) | 2017-07-24 | 2021-12-14 | Cmc Marine S.R.L. | Stabilization system for a watercraft |
CN111386223B (zh) * | 2017-07-24 | 2022-07-26 | Cmc船舶有限责任公司 | 用于船只的稳定系统 |
US10946942B2 (en) | 2017-12-15 | 2021-03-16 | Naiad Maritime Group, Inc. | Fin stabilizer |
US11685485B2 (en) | 2017-12-15 | 2023-06-27 | Naiad Maritime Group, Inc. | Fin stabilizer |
US11851144B2 (en) | 2017-12-15 | 2023-12-26 | Naiad Maritime Group, Inc. | Fin stabilizer |
DE102020208770A1 (de) | 2020-07-14 | 2022-01-20 | Skf Marine Gmbh | Vorrichtung |
Also Published As
Publication number | Publication date |
---|---|
ITMI20101688A1 (it) | 2012-03-18 |
IT1401941B1 (it) | 2013-08-28 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AX | Request for extension of the european patent |
Extension state: BA ME |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20121117 |