EP3526112B1 - Surfboard having a jet drive - Google Patents

Surfboard having a jet drive Download PDF

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Publication number
EP3526112B1
EP3526112B1 EP18829845.9A EP18829845A EP3526112B1 EP 3526112 B1 EP3526112 B1 EP 3526112B1 EP 18829845 A EP18829845 A EP 18829845A EP 3526112 B1 EP3526112 B1 EP 3526112B1
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EP
European Patent Office
Prior art keywords
opening
nozzle
jet
surfboard
base panel
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.)
Not-in-force
Application number
EP18829845.9A
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German (de)
French (fr)
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EP3526112A1 (en
Inventor
Nicolai WEISENBURGER
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.)
WBV Weisenburger Bau Verwaltung GmbH
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WBV Weisenburger Bau Verwaltung GmbH
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Application filed by WBV Weisenburger Bau Verwaltung GmbH filed Critical WBV Weisenburger Bau Verwaltung GmbH
Priority to HRP20220443TT priority Critical patent/HRP20220443T1/en
Publication of EP3526112A1 publication Critical patent/EP3526112A1/en
Application granted granted Critical
Publication of EP3526112B1 publication Critical patent/EP3526112B1/en
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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 
    • B63B32/00—Water sports boards; Accessories therefor
    • B63B32/10—Motor-propelled water sports boards
    • 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
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type
    • B63H2011/081—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type with axial flow, i.e. the axis of rotation being parallel to the flow direction

Definitions

  • the invention relates to a surfboard with a hull, with an underwater surface and a water inlet opening in the underwater surface and with a jet drive with a water channel from the water inlet opening to a water outlet opening arranged in a rear end face.
  • the surfboard according to the invention has an electric drive.
  • a surfboard is revealed.
  • a jet engine is mounted on a bottom plate that is inserted into an underwater surface of the surfboard from below.
  • a cooling system for a jet engine is disclosed.
  • the jet drive is screwed into a recess in the fuselage.
  • JP 2002 193185 A discloses a surfboard powered by an internal combustion engine.
  • Surfboards with an electric drive are, for example, from the DE 20 2011 051 071 known. Powered surfboards are not dependent on high waves, but they can also be used in windless waters with little surf.
  • the electric drive of the known surfboard is supplied with power via an accumulator arranged in the surfboard.
  • a jet tube between the water inlet and water outlet is designed as an aluminum component.
  • the underwater surface and the rear face are usually plastic components.
  • the known jet drive has the disadvantage that it is relatively expensive to produce and to use the material, and on the other hand the water inlet of the jet drive is designed in an unfavorable manner in terms of flow technology.
  • the object is achieved by a surfboard with the features of claim 1 mentioned at the outset.
  • Underwater surface is formed in one piece and to which a jet tube is connected at one end, the other end of which is connected to the water outlet opening.
  • one end of the jet tube is not placed directly onto the water inlet opening, but the water inlet opening is followed by a socket which is integrally formed with the underwater surface of the hull in the area of the water inlet opening and protrudes into the hull.
  • the socket is preferably made of the same material as the underwater surface. The material cost of this material is advantageously lower than that of the jet tube.
  • the stub can transition from the underwater surface into the hull in a one-piece manner as an injection molded component or laminate component.
  • the socket has a connection opening, which can preferably be flat. It can have an approximately elliptical, oval or circular connection cross-section.
  • One end of the jet pipe is connected to the connection opening.
  • the other end of the jet tube is connected to the water outlet opening, which can be designed as a nozzle.
  • connection opening can preferably touch the base plate.
  • no bulge is formed between the socket and the inner wall of the base plate.
  • At least the base plate and the socket can therefore be produced in one piece as a component with an injection molding tool.
  • the transition between the water inlet opening and the jet tube which is developed according to the invention compared to the prior art, creates a softer, smoother transition between the underwater surface and the water channel, which is more favorable in terms of flow.
  • the water inlet opening can be made significantly longer in the direction of the bow than in the prior art, without additional material costs arising for a longer jet tube component.
  • their extent in the longitudinal direction can be four, five or even six times the maximum width of the water inlet opening in the plane of the underwater surface.
  • the transition from the underwater surface into the socket can have a significantly smaller angle, that is to say flatter than in the prior art.
  • the socket is designed in a cost-effective manner as a plastic component.
  • the relatively expensive jet tube is formed of aluminum, and since the nozzle may have a circular or elliptical port opening, the jet tube can be easily formed as a bent tube with both ends cut off at a certain angle are, be educated. An additional deformation of one end of the jet pipe is no longer necessary.
  • the jet drive is designed as an electric drive that is powered by a battery.
  • the battery can be replaceable.
  • the electric drive drives a shaft with an impeller of the jet drive.
  • the jet drive preferably comprises a base plate and an end face which are connected to one another in a fixed position, and the connecting piece is connected in one piece to the base plate and protrudes from the base plate on the inside of the fuselage.
  • the socket can be designed as a passage in an internal elevation.
  • the elevation can be prismatic with an obtuse triangle as the lateral cross-sectional area.
  • a base plate is provided, from which the socket according to the invention protrudes on the inside of the fuselage, and in addition, on a rear edge of the base plate, an end face is connected in one piece to the base plate, which preferably lateral stabilizing walls are connected to the base plate and the end face at their edges.
  • the open box can be made in one piece. This production is particularly inexpensive.
  • the plastic part of the jet propulsion can of course also be made in one piece with the hull of the surfboard, or with a propulsion unit that is part of the surfboard.
  • the jet tube is preferably designed as an aluminum tube, which is adapted in its length and curvature so that it fits between the water outlet and the connection opening of the socket.
  • a watertight connection is provided there, for example in the form of a plug connection, screw connection or by means of toggle lever mechanisms or the like.
  • the jet tube has an additional lateral, bow-side opening through which the drive train for a rotor is routed.
  • the rotor is driven by an electric motor and a drive train.
  • a rotor can be an impeller or a propeller or similar.
  • a shaft of the drive is guided through a jet pipe wall and the impeller is arranged in the jet pipe.
  • a surfboard 1 shows a surfboard 1 according to the invention.
  • a surfboard 1 is to be understood here as a device on which the surfer stands, sits or kneels, and which floats on water and which advantageously has buoyancy sufficient to carry the surfer. At least the buoyancy together with the thrust that a jet drive 4 imparts to the surfboard 1 should be sufficient for the surfboard 1 to float above the water.
  • the surfboard 1 has no sail. In German usage, the sport would be classified as surfing.
  • the surfboard 1 has a bow 2 and a stern 3 .
  • a jet drive 4 is housed in the rear 3 .
  • the jet drive 4 is only shown schematically here.
  • the jet drive 4 comprises a water inlet opening 6 in an underwater surface of the surfboard 1 and a jet pipe 7 with a water outlet opening 8 arranged on a front side 21 of the stern 3.
  • the water outlet opening 8 can be designed as a nozzle, which can be pivoted about a step surface 9 arranged vertically if necessary Axis of rotation is rotatable.
  • a rotor (not shown) is arranged in the jet pipe 7, which sucks water into the jet pipe 7 and sprays it out of the nozzle, thus giving the surfer with the surfboard 1 propulsion.
  • a motor (not shown) for the rotor is also arranged in a hull 11 of the surfboard 1, which drives the rotor via a drive train (not shown), as well as a controller (not shown) for the motor, with which a power of the motor can be controlled. In particular, the speed of the surfboard 1 can be controlled with it. Both the motor and the controller are powered by an accumulator (not shown).
  • the surfboard 1 is designed here with the fixed hull 11 .
  • the hull 11 has, for example, a foam-containing core which is completely surrounded on the outside with laminate layers.
  • the jet drive 4 includes a base plate here 20 and an end face 21 and a socket 22 which protrudes from the inside of the base plate 20 and the jet tube 7 which connects the socket 22 to the water outlet opening 8 .
  • the socket 22 forms a transition between the water inlet opening 6 on the underwater surface and one end of the jet pipe 7. Another end of the jet pipe 7 is connected to the water outlet opening 8.
  • the 2 shows the jet drive 4 without rotor, motor and accumulator in a perspective view. From jet propulsion 4 is in the 2 only the base plate 20, the end face 21, the water inlet opening 6 and the jet pipe 7 with the water outlet opening 8 are shown.
  • the water inlet opening is placed in a plane with the base plate 20 or in the base plate 20, with the base plate 20 forming part of the underwater surface of the surfboard 1.
  • the main part of the underwater surface 5 is formed by a laminate outer surface of the hull 11.
  • the base plate 20 of the jet drive 4 forms a unit with the underwater surface 5 or at least a form-fitting unit.
  • the bottom plate 20 is pulled up inwards in the form of a socket.
  • the bottom plate 20 and the socket 22 are integrally formed in one piece. You can be a single injection molded part.
  • the end face 21 is provided, which is arranged on the rear edge of the base plate 20, as well as lateral stabilizing walls 23, which are here, for example, each triangular.
  • the two stabilizing walls 23, the end face 21 and the base plate 20 with the socket 22 are formed as a one-piece injection molded part or laminate component.
  • the connecting piece 22 with the base plate 20 it is possible to design the transition between an underwater surface 5 and the jet tube 7 through the water inlet opening 6 in a particularly favorable manner in terms of flow technology.
  • the bow-side end of the water inlet opening 6 can be pulled particularly far towards the bow 2, so that not only is an almost circular or largely oval or elliptical water inlet cross-section formed, but the water inlet opening 6 is formed, which is greatly extended towards the bow 2 of the surfboard 1.
  • the maximum length of the water inlet opening 6 can, for example, be three to four or five times greater than the maximum width of the water inlet opening 6.
  • the connecting piece 22 has a connection opening 27 on the inside, which is circular or elliptical, for example, and on which one end of the jet tube is connected 7 is arranged.
  • a bottom portion 24 of a terminal opening edge preferably touches the bottom plate 20, or is preferably spaced from it by a few millimeters, preferably more than 2, 3, 4 mm or more than 1 cm.
  • the geometry is chosen so that the production of the base plate 20 and the socket 22 is possible with a single injection molding tool.
  • a bottom portion 26 of the port opening edge is between the water inlet port 6 and a Level formed, which protrudes from the bottom portion 24 of the terminal opening edge perpendicular to the bottom plate 20 in the fuselage interior.
  • the bottom-side section 26 of the opening edge is spaced from the water inlet opening 6, preferably at least 5 mm, preferably at least 1 cm, 2 cm, 3 cm.
  • the bottom section 26 can also be arranged between the plane and another plane which protrudes perpendicularly into the interior of the hull from the opposite edge of the water inlet opening 6 .
  • the opposite edge of the water inlet port 6 faces the bottom portion.
  • the base plate 20 and the socket 22 and also the other plastic components can also be designed as 3D printing or CNC-milled components.
  • the jet pipe 7 is attached to the connection opening 27 of the connecting piece 22 .
  • the jet pipe 7 can, for example, be clamped, screwed on or inserted or glued into a circumferential groove.
  • Another end of the jet tube 7 is also connected to the water outlet opening 8 of the end face 21 by a screw or clamp connection or otherwise, preferably in a detachable manner.
  • the jet tube 7 is a complete aluminum component, while the base plate 20, the lateral stabilizing walls 23 and the end face 21 and the socket 22 are a laminate component or an injection-molded component, ie a plastic component, or a fiber-reinforced plastic component.
  • the nozzle 22 is in the 1 , 2 and 3 as a triangular elevation in longitudinal section, in which a piece of a water channel is introduced.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Hydraulic Turbines (AREA)
  • Toys (AREA)
  • Endoscopes (AREA)

Description

Die Erfindung betrifft ein Surfboard mit einem Rumpf, mit einer Unterwasserfläche und einer Wassereinlassöffnung in der Unterwasserfläche und mit einem Jetantrieb mit einem Wasserkanal von der Wassereinlassöffnung zu einer in einer heckseitigen Stirnseite angeordneten Wasserauslassöffnung. Das erfindungsgemäße Surfboard weist einen elektrischen Antrieb auf.The invention relates to a surfboard with a hull, with an underwater surface and a water inlet opening in the underwater surface and with a jet drive with a water channel from the water inlet opening to a water outlet opening arranged in a rear end face. The surfboard according to the invention has an electric drive.

In der DE 1 428 874 A1 ist ein mit einem Verbrennungsmotor angetriebenes Surfboard offenbart. In eine Bodenplatte ist ein Stutzen eingebaut, über den Wasser für den Antrieb abgesaugt wird.In the DE 1 428 874 A1 discloses a surfboard powered by an internal combustion engine. A socket is installed in a base plate through which water for the drive is sucked off.

In der DE 10 2015 103 503 A1 ist ein aufblasbares Surfboard mit einem Antriebsbauteil offenbart. Das Antriebsbauteil ist mit Befestigungsmitteln zwischen zwei Armen des Rumpfes befestigt.In the DE 10 2015 103 503 A1 discloses an inflatable surfboard with a propulsion component. The drive component is fastened with fasteners between two arms of the fuselage.

In der WO 2016/061274 A1 ist ein Surfboard offenbart. Ein Jetantrieb ist auf einer Bodenplatte montiert, die von unten in eine Unterwasserfläche des Surfboards eingesetzt wird.In the WO 2016/061274 A1 a surfboard is revealed. A jet engine is mounted on a bottom plate that is inserted into an underwater surface of the surfboard from below.

In der CN 205 738 032 U ist ein Kühlsystem für einen Jetantrieb offenbart. Der Jetantrieb ist in einer Aussparung am Rumpf eingeschraubt.In the CN 205 738 032 U a cooling system for a jet engine is disclosed. The jet drive is screwed into a recess in the fuselage.

In der JP 2002 193185 A ist ein Surfboard mit einem Verbrennungsmotor als Antrieb offenbart.In the JP 2002 193185 A discloses a surfboard powered by an internal combustion engine.

In der US 2009/093174 A1 ist ein Jetski beschrieben.In the U.S. 2009/093174 A1 a jet ski is described.

In der US 5 807 152 A ist ein Surfboard mit einem Elektromotor als Antrieb offenbart.In the U.S. 5,807,152 A discloses a surfboard with an electric motor as a drive.

Surfboards mit elektrischem Antrieb sind beispielsweise aus der DE 20 2011 051 071 bekannt. Angetriebene Surfboards sind nicht auf hohen Wellengang angewiesen, sondern sie können auch in windstillen und brandungsarmen Gewässern benutzt werden. Der elektrische Antrieb des bekannten Surfboards wird über einen im Surfboard angeordneten Akkumulator mit Strom versorgt. Zusätzlich ist ein Jetrohr zwischen Wassereinlass und Wasserauslass als Aluminiumbauteil ausgebildet. Die Unterwasserfläche und die heckseitige Stirnseite sind üblicherweise Kunststoffbauteile.Surfboards with an electric drive are, for example, from the DE 20 2011 051 071 known. Powered surfboards are not dependent on high waves, but they can also be used in windless waters with little surf. The electric drive of the known surfboard is supplied with power via an accumulator arranged in the surfboard. In addition, a jet tube between the water inlet and water outlet is designed as an aluminum component. The underwater surface and the rear face are usually plastic components.

Der bekannte Jetantrieb weist zum einen den Nachteil auf, dass er in der Herstellung und im Material relativ teuer ist, und zum anderen ist der Wassereinlass des Jetantriebs strömungstechnisch ungünstig ausgebildet.On the one hand, the known jet drive has the disadvantage that it is relatively expensive to produce and to use the material, and on the other hand the water inlet of the jet drive is designed in an unfavorable manner in terms of flow technology.

Es ist die Aufgabe der vorliegenden Erfindung, ein eingangs genanntes Surfboard zur Verfügung zu stellen, das die oben genannten Nachteile vermeidet, zumindest verringert. Die Aufgabe wird durch ein eingangs genanntes Surfboard mit den Merkmalen des Anspruchs 1 gelöst.It is the object of the present invention to provide a surfboard as mentioned at the outset which avoids, or at least reduces, the disadvantages mentioned above. The object is achieved by a surfboard with the features of claim 1 mentioned at the outset.

Unterwasserfläche einteilig ausgeformt ist und an den ein Jetrohr mit einem Ende angeschlossen ist, dessen anderes Ende an die Wasserauslassöffnung angeschlossen ist.Underwater surface is formed in one piece and to which a jet tube is connected at one end, the other end of which is connected to the water outlet opening.

Vorteilhafterweise wird das Jetrohr nicht direkt auf die Wassereinlassöffnung mit seinem einen Ende aufgesetzt, sondern an die Wassereinlassöffnung schließt sich ein Stutzen an, der integral mit der Unterwasserfläche des Rumpfes in dem Bereich der Wassereinlassöffnung ausgebildet ist und in den Rumpf hineinragt. Der Stutzen ist vorzugsweise aus dem gleichen Material wie die Unterwasserfläche ausgebildet. Die Materialkosten dieses Materials sind vorteilhafterweise niedriger als die des Jetrohrs. Der Stutzen kann in einteiliger Weise als Spritzgussbauteil oder Laminatbauteil von der Unterwasserfläche in den Rumpf hinein übergehen.Advantageously, one end of the jet tube is not placed directly onto the water inlet opening, but the water inlet opening is followed by a socket which is integrally formed with the underwater surface of the hull in the area of the water inlet opening and protrudes into the hull. The socket is preferably made of the same material as the underwater surface. The material cost of this material is advantageously lower than that of the jet tube. The stub can transition from the underwater surface into the hull in a one-piece manner as an injection molded component or laminate component.

Der Stutzen weist eine Anschlussöffnung auf, diese kann vorzugsweise eben ausgebildet sein. Sie kann einen ungefähr elliptischen, ovalen oder kreisförmigen Anschlussquerschnitt aufweisen. An die Anschlussöffnung ist das eine Ende des Jetrohrs angeschlossen. Das andere Ende des Jetrohrs ist mit der Wasserauslassöffnung verbunden, die als Düse ausgebildet sein kann.The socket has a connection opening, which can preferably be flat. It can have an approximately elliptical, oval or circular connection cross-section. One end of the jet pipe is connected to the connection opening. The other end of the jet tube is connected to the water outlet opening, which can be designed as a nozzle.

Vorzugsweise kann die Anschlussöffnung die Bodenplatte berühren. Es bildet sich vorzugsweise keine Ausbuchtung zwischen Stutzen und Innenwandung der Bodenplatte aus. Zumindest die Bodenplatte und der Stutzen können daher mit einem Spritzgusswerkzeug einteilig als ein Bauteil hergestellt werden.The connection opening can preferably touch the base plate. Preferably no bulge is formed between the socket and the inner wall of the base plate. At least the base plate and the socket can therefore be produced in one piece as a component with an injection molding tool.

Durch den gegenüber dem Stand der Technik erfindungsgemäß weitergebildeten Übergang zwischen Wassereinlassöffnung und Jetrohr wird ein weicherer, glatterer Übergang zwischen der Unterwasserfläche und dem Wasserkanal ausgebildet, der strömungstechnisch günstiger ist. Die Wassereinlassöffnung kann deutlich länglicher in Richtung des Bugs als im Stand der Technik ausgebildet sein, ohne dass zusätzliche Materialkosten für ein längeres Jetrohrbauteil entstehen. So kann ihre Ausdehnung in Längsrichtung das Vier-, Fünf- oder sogar Sechsfache der maximalen Breite der Wassereinlassöffnung in der Ebene der Unterwasserfläche betragen. Des Weiteren kann der Übergang von der Unterwasserfläche in den Stutzen hinein einen deutlich geringeren Winkel aufweisen, also flacher als im Stand der Technik erfolgen. Der Stutzen ist in kostengünstiger Weise als Kunststoffbauteil ausgebildet. Das relativ kostenintensive Jetrohr ist aus Aluminium gebildet, und dadurch, dass der Stutzen eine kreisförmige- oder elliptische Anschlussöffnung aufweisen kann, kann das Jetrohr in einfacher Weise als gebogenes Rohr, dessen beide Enden in einem bestimmten Winkel abgeschnitten sind, ausgebildet sein. Eine zusätzliche Verformung des einen Jetrohrendes ist nicht mehr erforderlich.The transition between the water inlet opening and the jet tube, which is developed according to the invention compared to the prior art, creates a softer, smoother transition between the underwater surface and the water channel, which is more favorable in terms of flow. The water inlet opening can be made significantly longer in the direction of the bow than in the prior art, without additional material costs arising for a longer jet tube component. Thus, their extent in the longitudinal direction can be four, five or even six times the maximum width of the water inlet opening in the plane of the underwater surface. Furthermore, the transition from the underwater surface into the socket can have a significantly smaller angle, that is to say flatter than in the prior art. The socket is designed in a cost-effective manner as a plastic component. The relatively expensive jet tube is formed of aluminum, and since the nozzle may have a circular or elliptical port opening, the jet tube can be easily formed as a bent tube with both ends cut off at a certain angle are, be educated. An additional deformation of one end of the jet pipe is no longer necessary.

Der Jetantrieb ist als elektrischer Antrieb ausgebildet, der über einen Akku mit Strom versorgt wird. Der Akku kann auswechselbar sein. Der elektrische Antrieb treibt eine Welle mit einem Impeller des Jetantriebs an.The jet drive is designed as an electric drive that is powered by a battery. The battery can be replaceable. The electric drive drives a shaft with an impeller of the jet drive.

Vorzugsweise umfasst der Jetantrieb eine Bodenplatte und eine Stirnseite, die positionsfest miteinander verbunden sind, und der Stutzen ist einteilig mit der Bodenplatte verbunden und steht rumpfinnenseitig von der Bodenplatte ab. Der Stutzen kann als Durchgang in einer innenseitigen Erhebung ausgebildet sein. Die Erhebung kann prismatisch ausgebildet sein mit einem stumpfwinkligen Dreieck als seitlicher Querschnittsfläche.The jet drive preferably comprises a base plate and an end face which are connected to one another in a fixed position, and the connecting piece is connected in one piece to the base plate and protrudes from the base plate on the inside of the fuselage. The socket can be designed as a passage in an internal elevation. The elevation can be prismatic with an obtuse triangle as the lateral cross-sectional area.

Es hat sich als besonders günstig erwiesen, den Kunststoffteil des Jetantriebs umfangreicher und derart auszubilden, dass eine Bodenplatte vorgesehen ist, von der der erfindungsgemäße Stutzen rumpfinnenseitig absteht, und zusätzlich an einem heckseitigen Rand der Bodenplatte eine Stirnseite einteilig mit der Bodenplatte verbunden ist, die über vorzugsweise seitliche Stabilisierungswände mit der Bodenplatte und der Stirnseite an deren Ränder verbunden ist. Dadurch entsteht ein im Längsschnitt etwa dreieckförmiger zum Rumpf hin offener Kasten aus Kunststoff, faserverstärktem Kunststoff oder einem Laminat. Im Inneren des Kastens steht der Stutzen insbesondere als prismatische Erhebung ab. Der offene Kasten kann einteilig hergestellt sein. Diese Herstellung ist besonders kostengünstig. Alternativ kann das Kunststoffteil des Jetantriebs natürlich auch in Einheit mit dem Rumpf des Surfbretts hergestellt werden, oder mit einer Antriebseinheit, die einen Teil des Surfbretts darstellt.It has proven to be particularly advantageous to design the plastic part of the jet drive to be more extensive and in such a way that a base plate is provided, from which the socket according to the invention protrudes on the inside of the fuselage, and in addition, on a rear edge of the base plate, an end face is connected in one piece to the base plate, which preferably lateral stabilizing walls are connected to the base plate and the end face at their edges. This creates a box made of plastic, fiber-reinforced plastic or a laminate that is approximately triangular in longitudinal section and open towards the fuselage. Inside the box, the socket protrudes in particular as a prismatic elevation. The open box can be made in one piece. This production is particularly inexpensive. Alternatively, the plastic part of the jet propulsion can of course also be made in one piece with the hull of the surfboard, or with a propulsion unit that is part of the surfboard.

Das Jetrohr ist vorzugsweise als Aluminiumrohr ausgebildet, das in seiner Länge und Krümmung so angepasst ist, dass es zwischen den Wasserauslass und die Anschlussöffnung des Stutzens passt. Dort ist eine wasserdichte Verbindung, beispielsweise in Form einer Steckverbindung, Schraubverbindung oder mittels Kniehebelmechanismen o.Ä. vorgesehen. Das Jetrohr weist eine zusätzliche seitliche, bugseitige Öffnung auf, durch die der Antriebsstrang für einen Rotor geführt ist. Der Rotor wird über einen Elektromotor und einen Antriebsstrang angetrieben. Bei einem Rotor kann es sich um einen Impeller oder einen Propeller o.Ä. handeln. Eine Welle des Antriebs ist durch eine Jetrohrwand geführtem- und der Impeller im Jetrohr angeordnet.The jet tube is preferably designed as an aluminum tube, which is adapted in its length and curvature so that it fits between the water outlet and the connection opening of the socket. A watertight connection is provided there, for example in the form of a plug connection, screw connection or by means of toggle lever mechanisms or the like. The jet tube has an additional lateral, bow-side opening through which the drive train for a rotor is routed. The rotor is driven by an electric motor and a drive train. A rotor can be an impeller or a propeller or similar. A shaft of the drive is guided through a jet pipe wall and the impeller is arranged in the jet pipe.

Die Erfindung wird anhand eines Ausführungsbeispiels in drei Figuren beschrieben. Dabei zeigen

Fig. 1
eine perspektivische Ansicht, teilweise als Durchsicht eines Surfboards mit erfindungsgemäßem Jetantrieb,
Fig. 2
den erfindungsgemäßen Jetantrieb in einer perspektivischen Ansicht,
Fig. 3
den erfindungsgemäßen Jetantrieb in einem zerlegten Zustand mit Jetrohr und Stutzenbauteil.
The invention is described using an exemplary embodiment in three figures. show it
1
a perspective view, partly as a see-through view of a surfboard with jet propulsion according to the invention,
2
the jet drive according to the invention in a perspective view,
3
the jet drive according to the invention in a disassembled state with jet tube and socket component.

Fig. 1 zeigt ein erfindungsgemäßes Surfboard 1. Unter einem Surfboard 1 ist hier eine Vorrichtung zu verstehen, auf der der Surfer steht, sitzt oder kniet, und die auf einem Wasser aufschwimmt und die vorteilhafterweise einen Auftrieb hat, der hinreichend ist, den Surfer zu tragen. Zumindest sollte der Auftrieb zusammen mit dem Vorschub, den ein Jetantrieb 4 dem Surfboard 1 verleiht, hinreichend sein, damit das Surfboard 1 über dem Wasser schwimmt. Das Surfboard 1 weist kein Segel auf. Im deutschen Sprachgebrauch würde man den Sport eher als Wellenreiten klassifizieren. 1 shows a surfboard 1 according to the invention. A surfboard 1 is to be understood here as a device on which the surfer stands, sits or kneels, and which floats on water and which advantageously has buoyancy sufficient to carry the surfer. At least the buoyancy together with the thrust that a jet drive 4 imparts to the surfboard 1 should be sufficient for the surfboard 1 to float above the water. The surfboard 1 has no sail. In German usage, the sport would be classified as surfing.

Das Surfboard 1 weist einen Bug 2 und ein Heck 3 auf. In dem Heck 3 ist ein Jetantrieb 4 untergebracht. Der Jetantrieb 4 ist hier nur schematisch dargestellt. Der Jetantrieb 4 umfasst eine Wassereinlassöffnung 6 in einer Unterwasserfläche des Surfboards 1 und ein Jetrohr 7 mit einer an einer Stirnseite 21 des Hecks 3 angeordneten Wasserauslassöffnung 8. Die Wasserauslassöffnung 8 kann als Düse ausgebildet sein, die gegebenenfalls schwenkbar um eine vertikal zu einer Trittfläche 9 angeordneten Drehachse drehbar ist.The surfboard 1 has a bow 2 and a stern 3 . A jet drive 4 is housed in the rear 3 . The jet drive 4 is only shown schematically here. The jet drive 4 comprises a water inlet opening 6 in an underwater surface of the surfboard 1 and a jet pipe 7 with a water outlet opening 8 arranged on a front side 21 of the stern 3. The water outlet opening 8 can be designed as a nozzle, which can be pivoted about a step surface 9 arranged vertically if necessary Axis of rotation is rotatable.

Im Jetrohr 7 ist ein nicht dargestellter Rotor angeordnet, der Wasser in das Jetrohr 7 hineinsaugt und aus der Düse herausspritzt und dem Surfer mit dem Surfboard 1 dadurch einen Vortrieb verleiht. In einem Rumpf 11 des Surfboards 1 ist des Weiteren ein (nicht dargestellter) Motor für den Rotor angeordnet, der den Rotor über einen (nicht dargestellten) Antriebsstrang antreibt, sowie eine (nicht dargestellte) Steuerung für den Motor, mit der eine Leistung des Motors gesteuert werden kann. Es kann damit insbesondere die Geschwindigkeit des Surfboards 1 gesteuert werden. Sowohl der Motor als auch die Steuerung sind durch einen (nicht dargestellten) Akkumulator mit Strom versorgt.A rotor (not shown) is arranged in the jet pipe 7, which sucks water into the jet pipe 7 and sprays it out of the nozzle, thus giving the surfer with the surfboard 1 propulsion. A motor (not shown) for the rotor is also arranged in a hull 11 of the surfboard 1, which drives the rotor via a drive train (not shown), as well as a controller (not shown) for the motor, with which a power of the motor can be controlled. In particular, the speed of the surfboard 1 can be controlled with it. Both the motor and the controller are powered by an accumulator (not shown).

Das Surfboard 1 ist hier mit dem festen Rumpf 11 ausgebildet. Dabei weist der Rumpf 11 beispielsweise einen schaumstoffhaltigen Kern auf, der außen mit Laminatlagen vollständig umgeben ist. Am heckseitigen Ende des Rumpfes 11 ist eine Aussparung 12 vorgesehen, in die der Jetantrieb 4 formschlüssig eingefügt ist. Der Jetantrieb 4 umfasst hier eine Bodenplatte 20 und eine Stirnseite 21 sowie einen Stutzen 22, der von der Bodenplatte 20 innenseitig absteht, und das Jetrohr 7, das den Stutzen 22 mit der Wasserauslassöffnung 8 verbindet. Der Stutzen 22 bildet einen Übergang zwischen der Wassereinlassöffnung 6 an der Unterwasserfläche und einem Ende des Jetrohrs 7. Ein anderes Ende des Jetrohrs 7 ist an die Wasserauslassöffnung 8 angeschlossen.The surfboard 1 is designed here with the fixed hull 11 . In this case, the hull 11 has, for example, a foam-containing core which is completely surrounded on the outside with laminate layers. At the rear end of the fuselage 11 there is a recess 12 into which the jet drive 4 is inserted in a form-fitting manner. The jet drive 4 includes a base plate here 20 and an end face 21 and a socket 22 which protrudes from the inside of the base plate 20 and the jet tube 7 which connects the socket 22 to the water outlet opening 8 . The socket 22 forms a transition between the water inlet opening 6 on the underwater surface and one end of the jet pipe 7. Another end of the jet pipe 7 is connected to the water outlet opening 8.

Fig. 2 zeigt den Jetantrieb 4 ohne Rotor, Motor und Akkumulator in einer perspektivischen Ansicht. Vom Jetantrieb 4 ist in der Fig. 2 lediglich die Bodenplatte 20, die Stirnseite 21, die Wassereinlassöffnung 6 und das Jetrohr 7 mit Wasserauslassöffnung 8 dargestellt. Die Wassereinlassöffnung ist in einer Ebene mit der Bodenplatte 20, bzw. in die Bodenplatte 20 eingebracht, wobei die Bodenplatte 20 einen Teil der Unterwasserfläche des Surfboards 1 ausbildet. Der Hauptteil der Unterwasserfläche 5 wird durch eine Laminataußenfläche des Rumpfes 11 ausgebildet Die Bodenplatte 20 des Jetantriebs 4 bildet mit der Unterwasserfläche 5 eine Einheit oder zumindest eine formschlüssige Einheit. 2 shows the jet drive 4 without rotor, motor and accumulator in a perspective view. From jet propulsion 4 is in the 2 only the base plate 20, the end face 21, the water inlet opening 6 and the jet pipe 7 with the water outlet opening 8 are shown. The water inlet opening is placed in a plane with the base plate 20 or in the base plate 20, with the base plate 20 forming part of the underwater surface of the surfboard 1. The main part of the underwater surface 5 is formed by a laminate outer surface of the hull 11. The base plate 20 of the jet drive 4 forms a unit with the underwater surface 5 or at least a form-fitting unit.

Die Bodenplatte 20 ist im Bereich der Wassereinlassöffnung 6 stutzenförmig nach innen hochgezogen. Die Bodenplatte 20 und der Stutzen 22 sind einteilig integral ausgebildet. Sie können ein einziges Spritzgussbauteil sein. Zusätzlich ist die Stirnseite 21 vorgesehen, die am heckseitigen Rand der Bodenplatte 20 angeordnet ist, sowie seitliche Stabilisierungswände 23, die hier beispielsweise jeweils dreieckig ausgebildet sind. Die beiden Stabilisierungswände 23, die Stirnseite 21 sowie die Bodenplatte 20 mit Stutzen 22 sind als einteiliges Spritzgussteil oder Laminatbauteil ausgeformt. Insbesondere durch die einteilige Ausbildung des Stutzens 22 mit der Bodenplatte 20 ist es möglich, den Übergang zwischen einer Unterwasserfläche 5 und dem Jetrohr 7 durch die Wassereinlassöffnung 6 strömungstechnisch besonders günstig auszugestalten. Insbesondere kann das bugseitige Ende der Wassereinlassöffnung 6 besonders weit zum Bug 2 hingezogen sein, so dass nicht nur ein beinahe kreisförmiger bzw. weitgehend ovaler oder elliptischer Wassereinlassquerschnitt ausgebildet wird, sondern die zum Bug 2 des Surfboards 1 hin stark ausgedehnte Wassereinlassöffnung 6 ausgebildet wird. Die maximale Länge der Wassereinlassöffnung 6 kann beispielsweise drei- bis vier- oder fünfmal größer sein als die maximale Breite der Wassereinlassöffnung 6. Der Stutzen 22 weist eine innenseitige Anschlussöffnung 27 auf, die beispielsweise kreisförmig oder elliptisch ausgebildet ist und an der das eine Ende des Jetrohres 7 angeordnet ist. Ein bodenseitiger Abschnitt 24 eines Anschlussöffnungsrandes berührt vorzugsweise die Bodenplatte 20, oder er ist vorzugsweise wenige Millimeter, vorzugsweise mehr als 2, 3, 4 mm oder mehr als 1cm von ihr beabstandet. Die Geometrie ist so gewählt, dass die Herstellung der Bodenplatte 20 und des Stutzens 22 mit einem einzigen Spritzgusswerkzeug möglich ist. Ein bodenabseitiger Abschnitt 26 des Anschlussöffnungsrandes ist zwischen der Wassereinlassöffnung 6 und einer Ebene ausgebildet, die von dem bodenseitigen Abschnitt 24 des Anschlussöffnungsrandes senkrecht zur Bodenplatte 20 in das Rumpfinnere absteht. Dabei ist der bodenabseitige Abschnitt 26 des Öffnungsrandes von der Wassereinlassöffnung 6 beabstandet, vorzugsweise wenigstens 5 mm, vorzugsweise wenigstens 1cm, 2cm, 3cm beabstandet. Der bodenabseitige Abschnitt 26 kann auch zwischen der Ebene und einer weiteren Ebene angeordnet sein, die vom gegenüberliegenden Rand der Wassereinlassöffnung 6 senkrecht in das Innere des Rumpfes absteht. Der gegenüberliegende Rand der Wassereinlassöffnung 6 liegt dem bodenseitigen Abschnitt gegenüber. Durch diese Ausbildung des Stutzens 22 ist es möglich, den Stutzen 22 als einteiliges Spritzgussteil mithilfe einer einzigen Spritzgussform herzustellen. Problematisch wird es, wenn der obere, öffnungsabseitige Anschlussöffnungsrand des Stutzens 22 über die Senkrechte zur heckseitigen Stirnseite 21 hin übersteht, dann wären zur Herstellung des Bauteiles gegebenenfalls zumindest zwei Spritzgussformen nötig.In the area of the water inlet opening 6 , the bottom plate 20 is pulled up inwards in the form of a socket. The bottom plate 20 and the socket 22 are integrally formed in one piece. You can be a single injection molded part. In addition, the end face 21 is provided, which is arranged on the rear edge of the base plate 20, as well as lateral stabilizing walls 23, which are here, for example, each triangular. The two stabilizing walls 23, the end face 21 and the base plate 20 with the socket 22 are formed as a one-piece injection molded part or laminate component. In particular, due to the one-piece design of the connecting piece 22 with the base plate 20, it is possible to design the transition between an underwater surface 5 and the jet tube 7 through the water inlet opening 6 in a particularly favorable manner in terms of flow technology. In particular, the bow-side end of the water inlet opening 6 can be pulled particularly far towards the bow 2, so that not only is an almost circular or largely oval or elliptical water inlet cross-section formed, but the water inlet opening 6 is formed, which is greatly extended towards the bow 2 of the surfboard 1. The maximum length of the water inlet opening 6 can, for example, be three to four or five times greater than the maximum width of the water inlet opening 6. The connecting piece 22 has a connection opening 27 on the inside, which is circular or elliptical, for example, and on which one end of the jet tube is connected 7 is arranged. A bottom portion 24 of a terminal opening edge preferably touches the bottom plate 20, or is preferably spaced from it by a few millimeters, preferably more than 2, 3, 4 mm or more than 1 cm. The geometry is chosen so that the production of the base plate 20 and the socket 22 is possible with a single injection molding tool. A bottom portion 26 of the port opening edge is between the water inlet port 6 and a Level formed, which protrudes from the bottom portion 24 of the terminal opening edge perpendicular to the bottom plate 20 in the fuselage interior. The bottom-side section 26 of the opening edge is spaced from the water inlet opening 6, preferably at least 5 mm, preferably at least 1 cm, 2 cm, 3 cm. The bottom section 26 can also be arranged between the plane and another plane which protrudes perpendicularly into the interior of the hull from the opposite edge of the water inlet opening 6 . The opposite edge of the water inlet port 6 faces the bottom portion. This design of the socket 22 makes it possible to produce the socket 22 as a one-piece injection molded part using a single injection mold. It becomes problematic if the upper, non-opening connection opening edge of the connecting piece 22 protrudes beyond the perpendicular to the rear end face 21, then at least two injection molds would possibly be necessary for the production of the component.

Die Bodenplatte 20 und der Stutzen 22 und auch die anderen Kunststoffbauteile können auch als 3D-Druck oder CNC-gefräste Bauteile ausgebildet sein.The base plate 20 and the socket 22 and also the other plastic components can also be designed as 3D printing or CNC-milled components.

An die Anschlussöffnung 27 des Stutzens 22 ist das Jetrohr 7 angesetzt. Das Jetrohr 7 kann beispielsweise eingeklemmt, angeschraubt oder in eine umlaufende Nut eingesetzt oder eingeklebt sein. Ein anderes Ende des Jetrohrs 7 ist mit der Wasserauslassöffnung 8 der Stirnseite 21 ebenso durch eine Schraub- oder Klemmverbindung oder anderweitig vorzugsweise lösbar verbunden. Das Jetrohr 7 ist ein vollständiges Aluminiumbauteil, während die Bodenplatte 20, die seitlichen Stabilisierungswände 23 sowie die Stirnseite 21 und der Stutzen 22 ein Laminatbauteil oder Spritzgussbauteil, also Kunststoffbauteil, oder faserverstärktes Kunststoffbauteil sind. Der Stutzen 22 ist in den Fig. 1, 2 und 3 als im Längsschnitt dreieckförmige Erhebung, in die ein Stück eines Wasserkanals eingebracht ist, ausgebildet.The jet pipe 7 is attached to the connection opening 27 of the connecting piece 22 . The jet pipe 7 can, for example, be clamped, screwed on or inserted or glued into a circumferential groove. Another end of the jet tube 7 is also connected to the water outlet opening 8 of the end face 21 by a screw or clamp connection or otherwise, preferably in a detachable manner. The jet tube 7 is a complete aluminum component, while the base plate 20, the lateral stabilizing walls 23 and the end face 21 and the socket 22 are a laminate component or an injection-molded component, ie a plastic component, or a fiber-reinforced plastic component. The nozzle 22 is in the 1 , 2 and 3 as a triangular elevation in longitudinal section, in which a piece of a water channel is introduced.

BezugszeichenlisteReference List

11
Surfboardsurf board
22
Bugbow
33
HeckRear
44
Jetantriebjet propulsion
55
Unterwassserflächeunderwater surface
66
Wassereinlassöffnungwater inlet opening
77
Jetrohrjet tube
88th
Wasserauslassöffnungwater outlet opening
99
Trittflächetread
1111
Rumpfhull
1212
Aussparungrecess
2020
Bodenplattebottom plate
2121
Stirnseiteface
2222
StutzenSupport
2323
Stabilisierungswändestabilization walls
2424
bodenseitiger Abschnittbottom section
2626
bodenabseitiger Abschnittoff-ground section
2727
Anschlussöffnungport opening

Claims (12)

  1. Surfboard having a hull (11) having an underwater surface and a water inlet opening (6) in the underwater surface and an electrical jet drive (4) having a water channel from the water inlet opening (6) to a water outlet opening (8) arranged in an end face (21) at the stern end, wherein the underwater surface is formed in the region of the water inlet opening (6) as a nozzle (22) protruding into the hull (11), characterised in that the nozzle (22) is moulded integrally with the underwater surface and one end of a jet tube (7) is connected to the nozzle (22), the other end being connected to the water outlet opening (8), and the jet tube (7) has, at the bow end on a jet tube wall, an additional lateral opening through which a shaft of the drive is guided.
  2. Surfboard according to claim 1, characterised in that the jet drive (4) comprises a base panel (20) and an end face (21) and the nozzle (22) is formed integrally in the base panel (20) and projects inside the base panel (20) into an interior space in the hull.
  3. Surfboard according to claim 1 or 2, characterised in that a base panel (20) and the end face (21) are connected to one another in a fixed position.
  4. Surfboard according to claim 1, 2 or 3, characterised in that the nozzle (22) has an inside connection opening (27) for one end of the jet tube (7), and an edge of the connection opening (27) remote from the opening is arranged between a plane, which projects perpendicularly from a base panel (20) on an edge projecting on the opening side, and the water inlet opening (8).
  5. Surfboard according to one of claims 1 to 4, characterised in that a bottom portion (24) of an opening edge of a connection opening (27) touches a base panel (20).
  6. Surfboard according to one of claims 1 to 5, characterised in that a base panel (20), the nozzle (22), the end face (21) and lateral stabilising walls (23) are formed integrally.
  7. Surfboard according to one of claims 1 to 6, characterised in that a base panel (20), the nozzle (22), the end face (21) and the lateral stabilising walls (23) are an integral injection moulded component.
  8. Surfboard according to one of claims 1 to 7, characterised in that a base panel (20), the nozzle (22), the end face (21) and the lateral stabilising walls (23) are an integral laminate component.
  9. Surfboard according to one of claims 1 to 8, characterised in that the jet tube (7) is an integral aluminium tube.
  10. Surfboard according to one of claims 1 to 9, characterised in that a base panel (20) and the nozzle (22) are an integral injection moulded component.
  11. Surfboard according to one of claims 1 to 10, characterised in that a bottom portion of a connection opening edge of the nozzle (22) is in direct contact with a base panel (20).
  12. Surfboard according to one of claims 1 to 11, characterised in that a shaft of the jet drive (4) is guided through the jet tube (7).
EP18829845.9A 2017-12-21 2018-12-20 Surfboard having a jet drive Not-in-force EP3526112B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
HRP20220443TT HRP20220443T1 (en) 2017-12-21 2018-12-20 Surfboard having a jet drive

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017130963.2A DE102017130963A1 (en) 2017-12-21 2017-12-21 SURFBOARD WITH JET DRIVE
PCT/EP2018/086275 WO2019122176A1 (en) 2017-12-21 2018-12-20 Surfboard having a jet drive

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EP3526112A1 EP3526112A1 (en) 2019-08-21
EP3526112B1 true EP3526112B1 (en) 2022-01-12

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EP (1) EP3526112B1 (en)
DE (1) DE102017130963A1 (en)
ES (1) ES2910260T3 (en)
HR (1) HRP20220443T1 (en)
WO (1) WO2019122176A1 (en)

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Publication number Priority date Publication date Assignee Title
US10597118B2 (en) 2016-09-12 2020-03-24 Kai Concepts, LLC Watercraft device with hydrofoil and electric propeller system
US12246811B2 (en) 2020-04-22 2025-03-11 Kai Concepts, LLC Watercraft device with a handheld controller
US10946939B1 (en) 2020-04-22 2021-03-16 Kai Concepts, LLC Watercraft having a waterproof container and a waterproof electrical connector
US11897583B2 (en) 2020-04-22 2024-02-13 Kai Concepts, LLC Watercraft device with hydrofoil and electric propulsion system
US11485457B1 (en) 2021-06-14 2022-11-01 Kai Concepts, LLC Hydrojet propulsion system
US11878775B2 (en) 2021-07-13 2024-01-23 Kai Concepts, LLC Leash system and methods of use
WO2024173165A2 (en) 2023-02-14 2024-08-22 Kai Concepts, LLC Watercraft device with a handheld controller

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US3262413A (en) * 1964-09-22 1966-07-26 Bloomingdale Motorized surfboard
JP2002193185A (en) * 2000-10-18 2002-07-10 Yamaha Motor Co Ltd Surfboard with engine
US7731553B2 (en) * 2007-10-09 2010-06-08 Surfango, Inc. Watercraft propelled by a water jet
DE202011051071U1 (en) 2011-08-24 2011-11-09 Sashay Gmbh Steerable surfboard
DE202015009792U1 (en) * 2014-10-07 2020-03-04 Lampuga Gmbh Inflatable surfboard
WO2016061274A1 (en) * 2014-10-15 2016-04-21 Boomerboard, Llc Electric motor for watercraft
CN205738032U (en) * 2016-05-12 2016-11-30 浙江道丰进出口有限公司 A kind of water-powered slide plate cooling system

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US5807152A (en) * 1996-02-06 1998-09-15 Wojcik; Warren Surfboard and method of making same

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EP3526112A1 (en) 2019-08-21
WO2019122176A1 (en) 2019-06-27
DE102017130963A1 (en) 2019-06-27
ES2910260T3 (en) 2022-05-12
HRP20220443T1 (en) 2022-05-27

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