EP4368494A1 - Elektrischer segelantrieb - Google Patents

Elektrischer segelantrieb Download PDF

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Publication number
EP4368494A1
EP4368494A1 EP22206905.6A EP22206905A EP4368494A1 EP 4368494 A1 EP4368494 A1 EP 4368494A1 EP 22206905 A EP22206905 A EP 22206905A EP 4368494 A1 EP4368494 A1 EP 4368494A1
Authority
EP
European Patent Office
Prior art keywords
electric
saildrive
elongate
hollow shaft
housing
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.)
Pending
Application number
EP22206905.6A
Other languages
English (en)
French (fr)
Inventor
Anders Hjort HOVMØLLER
Michèle Marie Kristine HOLM
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Undine AS
Original Assignee
Undine AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Undine AS filed Critical Undine AS
Priority to EP22206905.6A priority Critical patent/EP4368494A1/de
Priority to PCT/EP2023/081610 priority patent/WO2024100304A1/en
Publication of EP4368494A1 publication Critical patent/EP4368494A1/de
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H20/00—Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
    • B63H20/007—Trolling propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B2035/009—Wind propelled vessels comprising arrangements, installations or devices specially adapted therefor, other than wind propulsion arrangements, installations, or devices, such as sails, running rigging, or the like, and other than sailboards or the like or related equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H20/00—Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
    • B63H20/02—Mounting of propulsion units
    • B63H20/04—Mounting of propulsion units in a well
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
    • B63H2005/1254—Podded azimuthing thrusters, i.e. podded thruster units arranged inboard for rotation about vertical axis
    • B63H2005/1256—Podded azimuthing thrusters, i.e. podded thruster units arranged inboard for rotation about vertical axis with mechanical power transmission to propellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H20/00—Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
    • B63H20/32—Housings
    • B63H2020/323—Gear cases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • B63H21/386—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like for handling lubrication liquids

Definitions

  • the present invention relates to saildrives, in particular retrofittable electric sails drives for sailing boats.
  • the engine is an onboard engine located within the hull of the sailing boat, preferably amidships in order to give a good weight distribution.
  • the propeller is arranged at the distal end of an elongate drive housing extending from the bottom of the sailing boat, and via appropriate angle gears driven by a transmission axle running along the inside of the elongate drive housing.
  • the elongate drive housing will normally extend vertically downward from the hull just aft of the keel, i.e. between the keel and the rudder at the transom and in the same common vertical plane shared by keel and rudder.
  • the vertically arranged elongate drive housing referred to as drive leg
  • the drive leg comprises tubular part accommodated within a tubular part sealed to the hull of the boat.
  • the drive leg in turn may be sealed to in a solid fashion to the tubular member or by means of a further vibration damping flexible tubular member.
  • torque tube Inside the drive leg a hollow shaft, referred to as torque tube, for azimuthally turning the pod with the propeller.
  • the propeller itself is turned abouts a horizontal axis for propulsion by means of and angle gear located in the pod and connected to a vertical drive axle.
  • the vertical drive axle runs coaxially within the torque tube to the engine above the tubular part sealed to the hull.
  • the tubular part sealed to the hull preferably extends above the water line so as to prevent ingress of water into the boat.
  • EP2280862 discloses details of a similar arrangement of a propeller pod with an angle drive arranged at the end of a drive leg in which a coaxial torque tube and the likewise coaxial drive axle is accommodated. Focus is on the low height and the use of electric ring motors to achieve this, in turn resulting in a drive leg with a substantial diameter, which would cause excessive drag for a sailing boat where the saildrive is only an auxiliary propulsion - the main propulsion of course being wind and sails.
  • propulsion mode with the propeller facing rearwardly idle sailing mode where the propeller folds to reduce drag
  • regeneration mode where the leg entire with the propeller is azimuthally turned 180° to a forward facing direction in order to increase generation efficiency in the water flow.
  • an electric saildrive for a sailing boat, said electric saildrive comprising, an electric machine, an elongate hollow shaft having a proximal shaft end and distal shaft end, an elongate transmission axle extending longitudinally within said elongate hollow shaft and having a proximal axle end and a distal axle end, said electric machine being mechanically coupled to said elongate transmission axle at said proximal axle end, a hollow housing surrounding the elongate hollow shaft, a pod housing rigidly connected to the distal shaft end of said elongate hollow shaft and having a first aperture adapted to allow the transmission axle to extend into an inner compartment of the pod housing, where said inner compartment accommodates an angle drive connecting the transmission axle to a propeller shaft, said propeller shaft extending from said inner compartment to the exterior of the pod housing through a second aperture in a sealed manner, characterized in that the hollow housing has an elongate cross-section so as to provide a fin-shape.
  • the pod with the propeller to be azimuthally turned the 180° between the propulsion direction and the generation direction while the hollow housing with its fin-shape remains in the orientation with respect to the water flow direction for which the streamlined shape is optimized, as well as aligned with flow around the keel and hull in general.
  • the fin does thus not function as a rudder influencing the water flow, but rather functions as an auxiliary keel in stabilizing the sailing boat.
  • the elongate cross-section is generally rounded at the leading end, comprises a wider middle part and has a taper from said wider middle part towards the trailing end.
  • This provides the fin-shaped housing with a generally teardrop shaped cross-section so as to be streamlined with respect to water flow so as to reduce turbulence and other drag inducing effects.
  • the inner compartment of the pod housing is oil-filled. This efficiently lubricates the gear, propeller shaft and other parts of the transmission accommodated in the inner compartment of the pod. Furthermore, the oil counteracts the external pressure from the surrounding water on seals, e.g. surrounding the propeller shaft where it exits the pod, thus reducing the risk of ingress of water.
  • the sail drive comprises an oil reservoir adapted to be arranged above the water line of the sailing boat, and in fluid communication with said inner compartment of the pod housing via a gap between said elongate hollow shaft and said transmission axle. This will allow the oil pressure in the pod to be equal to or preferably exceed the external water pressure, thus further reducing the risk of ingress of water.
  • the elongate hollow shaft comprises a number of oil passages allowing the gap between said elongate hollow shaft and said transmission axle to remain oil-filled from said reservoir. This increases the freedom in positioning the reservoir as it need not be accommodated above the level of the gap between the elongate hollow shaft and the transmission axle, i.e. above the proximal end of the hollow shaft, but may instead be provided sideways thereof as long as it is ensured that it is positioned above the water line of the sailing boat.
  • the saildrive further comprises a, preferably, electric azimuth control motor adapted to turn said elongate hollow shaft with respect to the hollow housing.
  • An electric motor is cost-efficient in provision, easy to maintain and easy to control so that the azimuthal position of the hollow shaft and, in turn, the pod is well defined.
  • the electric azimuth control motor is coupled to said elongate hollow shaft via a belt drive for transmission of rotary motion.
  • a belt drive is cost-efficient in provision, easy to maintain, and needs no lubrication of protection from corrosive substances, such as saline seawater.
  • the saildrive further comprises a base plate adapted to allow the sail drive to be mounted on said sailing boat from the inside of a hull of said sailing boat and with the longitudinal direction of the hollow housing aligned with the longitudinal direction of the hull. This facilitates the placement and attachment to the sailing boat. It furthermore allows substitution of an existing sail drive using the mounting facilities already present in the sailing boat.
  • the saildrive further comprises a flexible seal between said base plate and said hollow housing.
  • the electric machine comprises an output shaft axially aligned with said transmission axle. This allows vertical, space saving arrangement of the electric machine and obviates the need of angle gears or the like, thus reducing the number of parts that need to be serviced and maintained.
  • the sail drive comprises further electric machines with output shafts aligned with said transmission axle.
  • the sail drive comprises further electric machines with output shafts aligned with said transmission axle.
  • a sailing boat 1 with a sail drive 2 is schematically shown.
  • the sailing ship comprises a hull 4.
  • the hull 4 will normally have mirror symmetric about vertical symmetry plane extending bow to stern in the longitudinal direction of the hull 4.
  • Asymmetric hulls 4 are of course also known, e.g. for catamarans, but for this description it will be assumed that the sailing boat 1 is a single hull boat with one mirror symmetric hull 4.
  • the hull 4 has an integral keel 5, but, as will be understood by the person skilled in the art, the saildrive 2 would also be applicable to sailing boats with lowering keels or daggerboards etc. as this, like the number of hulls 4 is of little relevance to the saildrive 2 per se.
  • the saildrive 2 is mounted in the hull 4 and extends downwardly from the hull 4, preferably in the vertical symmetry plane.
  • the sailing boat 1 in the illustrated embodiment is shown with a single rudder 6, the rotations axis of which also extends downward from the hull 4 in the vertical symmetry plane, s that in a neutral rudder position the central symmetry plane of the rudder 6 is aligned with the vertical symmetry plane of the hull 4.
  • the sail drive 2 preferably also extends from the hull 4 in the vertical symmetry plane, preferably at a location of the between the keel 5 and the rudder 6.
  • Aligning keel 5, saildrive 2 and rudder 6 is beneficial for the flow around the saildrive 2, be it in a propulsion configuration, as shown, with the propeller 7 facing backwards from the saildrive 2 as seen with respect to the sailing boat 1 or in a generation configuration with the propeller 7 facing forwards from the saildrive 2.
  • the saildrive 2 is schematically shown mounted in a section of the hull 4 of the sailing boat 1.
  • the saildrive 2 comprises external parts below the section of the hull 4 schematically shown, adapted to be immersed in the water, and parts accommodated within the hull 4, i.e. above the section of the hull 4 schematically shown.
  • the parts adapted to be immersed in and hence in contact with the water comprise a hollow housing 8, a pod housing 9 and a propeller shaft 10.
  • the hollow housing 8 may preferably be a solid block of marine grade aluminium or other suitable material for marine purposes made hollow by having a through bore adapted in diameter for accommodating a hollow shaft 15 and other parts of the transmission to be explained below.
  • the propeller 11 is not shown in Fig. 2 .
  • the propeller 11 is a separate and interchangeable part that may be supplied and sold separately from the remainder of the saildrive 2 without deviating from the inventive idea and construction thereof and has therefore been omitted.
  • the propeller 11 is normally secured to the propeller shaft 10 by a threaded part 29 of the propeller shaft 10 with an external thread matching an internal thread in a bore in the propeller 11 (not shown).
  • the saildrive 2 furthermore comprises parts adapted to be mounted within the hull 4. These parts comprise a base plate 12 adapted to allow the saildrive 2 to be mounted on said sailing boat 1 from the inside of the hull 4 of the sailing boat 1, typically on a mounting part 4' or other reinforced part of the hull 4 as schematically shown in Fig. 2 .
  • the base plate 12 directly or indirectly carries all the parts of the saildrive 2, so that the saildrive 2 may be provided and mounted as one single preassembled unit by securing the base plate 12 to the hull 4 by suitable means such as bolts (not shown) in bolt holes 31 in the hull 4, cf. Fig. 4a .
  • an electric machine 13 is provided above the base plate 12 .
  • the electric machine 13 coupled to the proximal end of a vertical transmission axle 14 visible in the exploded view of Fig. 3 and the cross-sectional view of Fig. 4a .
  • the arrangement is similar in the embodiment of Fig 4b .
  • the coupling between the electric machine 13 and the vertical transmission axle 14 is preferably directly, i.e. so that the output shaft of the electric machine 13 is aligned with the transmission axle 14 and in direct connection therewith without any intermediate gear or the like, although an axial gear such as a planetary gear.
  • the electric machine 13 may act as both a generator for recharging energy storage of the saildrive 2 such as batteries and as a propulsion motor powered by the energy storage when needed. Control of the electric machine 13, charging and discharging of the energy storages, and the energy storage itself are not considered part of the invention and will not be dealt with.
  • the sail drive could comprise several, preferably flat disc-shaped electric machines 13 acting directly on or having their output shafts aligned with the vertical transmission axle 14. This allows the total output power to adapted to the specific power needs or available space, allowing the user to order to some extent a saildrive 2 custom built to his or her sailing boat 1 .
  • the vertical transmission axle 14 extends longitudinally within an elongate hollow shaft 15.
  • the distal end of the elongate hollow shaft 15 is coupled to the pod housing 9 by a suitable coupling means e.g. and external thread 16 adapted to match an internal thread (not visible) in a tubular connection part 17.
  • the tubular connection part provides a first aperture in the pod housing 9 adapted to allow the transmission axle 14 to extend into the inner compartment 18 of the pod housing 9.
  • the propeller shaft extends 10 from a second aperture in the pod housing 9. Both the first aperture and the second aperture of the pod housing 9 are suitably sealed against ingress of water from the exterior. Being preferably a solid block of metal, the hollow housing 8 yields good support for the hollow shaft 15 and the vertical transmission axle 14 against bending forces from the surrounding water.
  • the inner compartment 18 accommodates an angle drive connecting the transmission axle 14 to the propeller shaft 10.
  • the angle drive in the illustrated example comprises a bevel gear with one conical gear wheel 19 on the transmission axle 14 meshing with a likewise conical gear wheel 20 on the propeller shaft 10.
  • Bearings 21 for the propeller shaft 10 are also provided in the inner compartment of the pod housing 9.
  • Bearings 22 for the distal end of the transmission axle 14 are also provided, preferably within the tubular connection part 17.
  • the gap 23 between the hollow shaft 15 and the transmission axle 14 be in fluid connection with the inner compartment 18 of the pod housing 9.
  • the gap 34 between the hollow shaft 15 and the hollow housing 8 is preferably also oil-filled.
  • passages 35 are then provided in the hollow shaft 8 to allow oil to flow between the gaps 23 and 34.
  • the connection from the reservoir 33 to the oil duct 36 may be any suitable conduit 37 such as a flexible hose and is only shown schematically as a dashed line.
  • the hollow shaft 15 to which the pod housing 9 is rigidly secured extends through a hollow housing 8, the hollow housing 8 at least being hollow in the sense that it comprises a through passage adapted to accommodate the hollow shaft 15.
  • the hollow housing 8 supports the hollow shaft 15 in the radial direction and prevents forces of the flow of surrounding water when sailing from deflecting the hollow shaft 15 in the radial direction.
  • the hollow housing 8 is rigidly connected to the base plate 12, preferably directly thereto.
  • the base plate in turn is adapted to be rigidly secured to the inside of the hull 4 e.g. by means of bolts fitting in existing bolt holes 31 for a prior saildrive that is to be replaced by the electric saildrive 2 according to the invention.
  • the base plate has matching bolt holes 32, so arranged respect to with the remainder of the saildrive 2, that the alignment of the fin-shape of the hollow housing 8 matches the sailing direction of the sailing boat 1 is ensured.
  • a flexible seal 30 is preferably interposed to prevent ingress of water and to accommodate for vibrations and flexing of the parts of the saildrive 2 extending from the hull 4.
  • the hollow housing 8 of the saildrive to be fitted in a fixed position with respect to the hull 4 of the boat, preferably longitudinally aligned with the keel 5 and the rudder 6 of the sailing boat 1 in order to optimize flow, be it under sail or during propulsion by the saildrive 2.
  • the hollow housing 8 has an elongate cross-section, as can be seen in Fig. 5 . Being fixed, the flow around the hollow housing 8 is not to any significance influenced by the azimuthal turning of the pod 9 from propulsion configuration to regeneration configuration.
  • the hollow shaft 15 to which the pod housing 9 is rigidly secured on the other hand may turn azimuthally with respect to the hollow housing 8 through which it extends, allowing inter alia the propeller shaft to point in any 360° azimuthal direction as indicated by the dashed arrows Az in Fig. 5 .
  • the hollow shaft 15 and hence the pod housing 9 may freely rotate through in principle an infinite angle, and because there need not be any electrical leads, lubrication or the like to take into account the angle is not limited to a restricted angle of a finite number of 360° turns. This can be achieved by an electric azimuth control motor 24 adapted to turn said elongate hollow shaft 15 with respect to the hollow housing 8 via a suitable transmission.
  • the electric azimuth control motor 24 is coupled to said elongate hollow shaft 15 via a belt drive with a drive belt 25.
  • the electric azimuth control motor 24 preferably acts on or at the distal end of the hollow shaft 15.
  • the hollow shaft 15 may in this respect comprises a disk 28 with larger diameter than the hollow shaft 15 as well as a larger diameter than the output shaft 26 of the azimuth control motor 24 or a pulley 27 arranged thereon in order to provide a suitable reduction gearing, allowing only a small electric azimuth control motor 24 to turn the pod housing 9 in the water.
  • the azimuth control motor 24 need not actually be electric, but in an electric sail drive it would make little sense to use other means such as a hand crank, a hydraulic motor or the like.
  • the disc 28 may comprise a tacho disk or milled-in markings or similar for optical or other capture of the azimuthal position of the pod housing 9 and hence the direction in which the propeller shaft 10 points.
  • an second circular disc or cylinder 38 may be excentrically arranged on the disc 28.
  • the azimuthal position of the pod housing 9 can then be determined by means of range sensors (not shown) arranged in the horizontal plane of the disc or cylinder 38 and angularly spaced apart by e.g. 90°.
  • the hollow housing 8 surrounds the hollow shaft 15 in an asymmetric manner in the lengthwise direction, i.e. that the trailing part (on the left-hand side of the hollow shaft 15 in Fig. 4a and 4b ) extends much farther away from the hollow shaft 15 than the leading part (on the right-hand side of the hollow shaft 15 in Fig. 4a and 4b ).
  • the lengthwise dimension is also larger than the cross-wise dimension, so that the cross-section has an elongate shape, i.e. is fin-shaped.
  • the cross-section is generally teardrop shaped, having a rounded leading end 81, a wider middle part 82 and from the wider middle part 82 a trailing part 83 with a taper from said wider middle part 82 towards the trailing end 84.
  • the trailing end 84 is also slightly rounded, but with a far smaller radius that the leading end 81. It could in principle be as sharp as technical constrictions and safety allow.
  • the taper in the illustrated example is generally wedge shaped, i.e. flat straight surfaces, but it is to be understood that the taper could also involve convexly or concavely curved surfaces. This is merely a matter of optimizing the shape of the streamline of the elongate cross-section.
  • any other streamlined elongate shape is of course also possible, e.g. ellipsoid, lentil-shaped, oval etc. as long as a fin is provided. Still without deviation from the invention, some of these cross-sections may have the hollow shaft 15 centrally and/or symmetrically arranged with respect to the hollow housing 8. The essential part being that the elongate fin-shape is fixed with respect to the hull and provides good flow with low drag around the sail drive 1.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
EP22206905.6A 2022-11-11 2022-11-11 Elektrischer segelantrieb Pending EP4368494A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22206905.6A EP4368494A1 (de) 2022-11-11 2022-11-11 Elektrischer segelantrieb
PCT/EP2023/081610 WO2024100304A1 (en) 2022-11-11 2023-11-13 An electric saildrive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22206905.6A EP4368494A1 (de) 2022-11-11 2022-11-11 Elektrischer segelantrieb

Publications (1)

Publication Number Publication Date
EP4368494A1 true EP4368494A1 (de) 2024-05-15

Family

ID=84331639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22206905.6A Pending EP4368494A1 (de) 2022-11-11 2022-11-11 Elektrischer segelantrieb

Country Status (2)

Country Link
EP (1) EP4368494A1 (de)
WO (1) WO2024100304A1 (de)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1689962A (en) * 1925-10-05 1928-10-30 Elmer E Peck Propelling mechanism for boats
GB2063196A (en) 1979-11-13 1981-06-03 Steadman E J Boat drive-leg sealing arrangement
EP2154063A1 (de) 2008-08-13 2010-02-17 Vesting Projektentwicklungs AG Hybride Hilfsantriebsordnung für eine Segelyacht
EP2280862A2 (de) 2008-05-21 2011-02-09 Siemens Aktiengesellschaft Azimut-propellerantriebseinrichtung mit niedriger einbauhöhe für eine schwimmende einrichtung
US20120028514A1 (en) * 2009-04-07 2012-02-02 Zf Friedrichshafen Ag Ship propulsion system
US8425268B2 (en) * 2010-03-31 2013-04-23 Suzuki Motor Corporation Electric outboard motor
US20150050846A1 (en) * 2012-09-26 2015-02-19 Robert Case Shallow-draft watercraft propulsion and steering apparatus
US20210070411A1 (en) * 2019-09-06 2021-03-11 Johnson Outdoors Inc. Motor Assembly Having Lifting Mechanism and Watercraft Incorporating Same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1689962A (en) * 1925-10-05 1928-10-30 Elmer E Peck Propelling mechanism for boats
GB2063196A (en) 1979-11-13 1981-06-03 Steadman E J Boat drive-leg sealing arrangement
EP2280862A2 (de) 2008-05-21 2011-02-09 Siemens Aktiengesellschaft Azimut-propellerantriebseinrichtung mit niedriger einbauhöhe für eine schwimmende einrichtung
EP2154063A1 (de) 2008-08-13 2010-02-17 Vesting Projektentwicklungs AG Hybride Hilfsantriebsordnung für eine Segelyacht
US20120028514A1 (en) * 2009-04-07 2012-02-02 Zf Friedrichshafen Ag Ship propulsion system
US8425268B2 (en) * 2010-03-31 2013-04-23 Suzuki Motor Corporation Electric outboard motor
US20150050846A1 (en) * 2012-09-26 2015-02-19 Robert Case Shallow-draft watercraft propulsion and steering apparatus
US20210070411A1 (en) * 2019-09-06 2021-03-11 Johnson Outdoors Inc. Motor Assembly Having Lifting Mechanism and Watercraft Incorporating Same

Also Published As

Publication number Publication date
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