EP2072392A2 - Boot drive screw - Google Patents

Boot drive screw Download PDF

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Publication number
EP2072392A2
EP2072392A2 EP08170610A EP08170610A EP2072392A2 EP 2072392 A2 EP2072392 A2 EP 2072392A2 EP 08170610 A EP08170610 A EP 08170610A EP 08170610 A EP08170610 A EP 08170610A EP 2072392 A2 EP2072392 A2 EP 2072392A2
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EP
European Patent Office
Prior art keywords
propeller blade
propeller
boat
drive screw
screw according
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.)
Granted
Application number
EP08170610A
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German (de)
French (fr)
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EP2072392B1 (en
EP2072392A3 (en
Inventor
Hans Weber
Velimir Radmanic
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VISCO JET RUEHRSYSTEME GmbH
Original Assignee
Inotec GmbH Transport und Foerdersysteme
Inotec GmbH
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Publication of EP2072392A2 publication Critical patent/EP2072392A2/en
Publication of EP2072392A3 publication Critical patent/EP2072392A3/en
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Publication of EP2072392B1 publication Critical patent/EP2072392B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/26—Blades
    • B63H1/265—Blades each blade being constituted by a surface enclosing an empty space, e.g. forming a closed loop

Definitions

  • the present invention relates to a boat propeller with at least two propeller blades arranged symmetrically at the end on a drive shaft flange, wherein an inflow opening of a channel narrowing therefrom is provided at the leading edge of each propeller blade, which opens into an outflow opening in the region of the rear edge of the propeller blade in order to increase the power output of the propeller blade To generate drive.
  • Boat propellers also called propellers
  • Boat drive screws are among the caseless flow machines that absorb mechanical work and deliver it in the form of flow energy to the surrounding water.
  • the propeller blades are shaped and aligned so that they are flowed obliquely or asymmetrically upon rotation of the drive shaft from the surrounding water. This creates a pressure gradient in or opposite to the direction of motion that creates a flow of water. Every single propeller blade experiences dynamic buoyancy.
  • the skewed dynamic buoyancy forces of the individual propeller blades superimpose their axial components into a resultant force between the medium and the boat propeller, referred to as propulsion, which drives the propeller propeller together with the connected object, the boat.
  • the above-described general principle of a boat propeller has recently undergone technical improvements to increase performance, that is, to increase the efficiency of the propulsion.
  • the individual propeller blades can be provided with internal flow channels.
  • the present invention is devoted to this aspect.
  • each propeller blade is made of a U-shaped metal sheet whose opposite leg sides together with the bottom side form the narrowing channel.
  • the advantage of the solution according to the invention lies in particular in that, starting from the casting technique, the boat drive screw is manufactured in a completely new way. It has been recognized that the intrinsically complicated structure of a propeller blade can also be reproduced with a substantially U-shaped metal sheet, and in a manner which is almost optimal for flow.
  • the boat propeller according to the invention can be produced as a welded construction made of sheet metal production technology. As a result, less material is used, which also advantageously reduces the weight of the boat propeller. In order to produce a torque equal to that of a cast boat drive screw of the type of interest here, less drive energy is required. To generate the same liquid flow is only about three quarters of the usual energy required, as experiments showed.
  • the friction losses in the boat propeller according to the invention are also quite low, as it operates at much lower speeds. Since less cavitation phenomena are to be expected in the embodiment according to the invention as a welded construction, the durability of the components is higher than in the prior art. With the boat propeller according to the invention, the fuel costs can be reduced in two-digit percentage, which benefits the environment.
  • each propeller blade at the distal end of the leg sides with the drive flange.
  • the distal end of each propeller blade is fitted with a concave edge to conform to the contour of the drive shaft flanges to achieve a uniform weld gap to the drive shaft flange.
  • the weld can be executed as a fillet weld, wherein the seam thickness is to be dimensioned according to the torque occurring at the connection point between the propeller blade and the drive flange.
  • the opposite leg sides consist of a stamped and bent part, which are welded at the boundary points to also designed as a stamped bent part bottom side.
  • the bottom side of the propeller blade is here performed in adaptation, the outer radial helical shape preferably arched. The curvature can be easily produced by bending.
  • each propeller blade may also be wavy shaped.
  • the curl can be achieved by bending.
  • an improvement of the flow characteristics is a preferably conically shaped drive shaft flange to good.
  • the drive shaft flange can also be produced from correspondingly shaped metal sheet in the manner of a welded construction.
  • the metal sheet of the propeller blade and that of the drive shaft flange should be made of the same alloyed steel.
  • cohesive joining is also suitable for brazing.
  • the boat drive screw consists of three propeller blades 2a to 2c arranged symmetrically with respect to a drive shaft flange 1.
  • the drive shaft flange 1 consists of a conically shaped metal sheet, on which the propeller blades 2a to 2c are welded with their distal end.
  • Each propeller blade 2a to 2c is made of a U-shaped metal sheet in which a channel 5, which narrows from an inflow opening 3 to an outflow opening 4, is formed.
  • the channel 5 serves to increase the power of the drive to produce a propeller blade internal high flow rate due to the speed of the propeller blades 2a to 2c.
  • the channel 5 is formed in each propeller blade 2a to 2c by opposing leg sides 6a and 6b of a metal sheet having a bottom side 7 welded thereto.
  • each propeller blade 2a to 2c is curved in the circumferential direction of the screw in order to ensure favorable flow characteristics.
  • the propeller blades 2a to 2c are arranged symmetrically about the drive shaft flange 1.
  • each propeller blade 2 a are corrugated in order to ensure, in accordance with the principles of fluid mechanics, axial propulsion of the boat propulsion screw as a result of rotational movement.
  • the metal sheet for the conically shaped drive shaft flange 1 and the metal sheet for the propeller blades 2a ff. In this embodiment have the same thickness and consist of the same alloy steel.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Screw Conveyors (AREA)
  • Earth Drilling (AREA)

Abstract

The boat drive propeller has propeller blades (2a,2b,2c) arranged symmetrically on an end-side of a drive shaft flange (1). An inflow opening (3) of a tapering channel (5) is provided on a leading edge of each propeller blade. The channel opens in an outflow opening (4) in an area of a trailing edge of a propeller blade. The propeller blade is made from a U-shaped sheet metal, whose opposing shank sides (6a,6b) together with a bottom side (7) form the tapering channel. A sheet metal of the propeller blade and the drive shaft flange is made from steel of same alloy.

Description

Die vorliegende Erfindung betrifft eine Bootsantriebsschraube mit mindestens zwei endseitig an einem Antriebswellenflansch symmetrisch angeordneten Propellerblättern, wobei an der Anströmkante jedes Propellerblatts eine Einströmöffnung eines sich von hieraus verengenden Kanals vorgesehen ist, der im Bereich der Rückkante des Propellerblatts in eine Ausströmöffnung mündet, um eine Leistungssteigerung des Antriebs zu erzeugen.The present invention relates to a boat propeller with at least two propeller blades arranged symmetrically at the end on a drive shaft flange, wherein an inflow opening of a channel narrowing therefrom is provided at the leading edge of each propeller blade, which opens into an outflow opening in the region of the rear edge of the propeller blade in order to increase the power output of the propeller blade To generate drive.

Das Einsatzgebiet von Bootsantriebsschrauben erstreckt sich auf Wasserfahrzeuge aller Größenklassen. Bootsantriebsschrauben, auch Propeller genannt, stellen das am weitesten verbreitete Antriebsorgan für Wasserfahrzeuge dar, welches durch um eine Antriebswelle symmetrisch radial angeordnete Flügel realisiert ist. Bootantriebsschrauben zählen zu den gehäuselosen Strömungsmaschinen, die mechanische Arbeit aufnehmen und diese in Form von Strömungsenergie an das sie umgebende Wasser abgeben. Die Propellerblätter sind so geformt und ausgerichtet, dass diese bei Rotation der Antriebswelle vom umgebenen Wasser schräg oder asymmetrisch umströmt werden. Dadurch entsteht ein Druckgefälle in oder entgegengesetzt zur Bewegungsrichtung, das eine Strömung des Wassers erzeugt. Jedes einzelne Propellerblatt erfährt dynamischen Auftrieb. Die schräg gerichteten dynamischen Auftriebskräfte der einzelnen Propellerblätter überlagern ihre axial Komponenten zu einer resultierenden Kraft zwischen dem Medium und der Bootsantriebsschraube, die als Schub bezeichnet wird und die Bootsantriebsschraube mitsamt dem verbundenen Objekt, also dem Boot, antreibt.The field of application of boat propulsion screws extends to vessels of all sizes. Boat propellers, also called propellers, represent the most widely used propulsion device for watercraft, which is realized by a symmetrically about a drive shaft radially arranged wing. Boat drive screws are among the caseless flow machines that absorb mechanical work and deliver it in the form of flow energy to the surrounding water. The propeller blades are shaped and aligned so that they are flowed obliquely or asymmetrically upon rotation of the drive shaft from the surrounding water. This creates a pressure gradient in or opposite to the direction of motion that creates a flow of water. Every single propeller blade experiences dynamic buoyancy. The skewed dynamic buoyancy forces of the individual propeller blades superimpose their axial components into a resultant force between the medium and the boat propeller, referred to as propulsion, which drives the propeller propeller together with the connected object, the boat.

Das vorstehend beschriebenen allgemeine Prinzip einer Bootsantriebsschraube erfuhr in jüngster Zeit technische Verbesserungen zur Leistungssteigerung, also zur Erhöhung des Wirkungsgrades des Antriebs. Zu diesem Zwecke können beispielsweise die einzelnen Propellerblätter mit internen Strömungskanälen versehen werden. Die vorliegende Erfindung widmet sich diesem Aspekt.The above-described general principle of a boat propeller has recently undergone technical improvements to increase performance, that is, to increase the efficiency of the propulsion. For this purpose, for example, the individual propeller blades can be provided with internal flow channels. The present invention is devoted to this aspect.

Aus der US 2003/0175120 A1 geht eine gattungsgemäße Bootsantriebsschraube mit in den Propellerblättern eingearbeiteten Kanälen hervor. Die einzelnen Propellerblätter sind gegossen und weisen im Querschnitt eine strömungsoptimale Flügelform auf. An der Anströmkante jedes Propellerblatts befindet sich eine flache Öffnung, welche den Anfang eines sich im Verlaufe der Längserstreckung des Propellerblatts verengenden Kanals bildet. An der Rückkante des Propellerblatts endet dieser Kanal in eine Ausströmöffnung. Der Querschnitt der ebenfalls flachen Ausströmöffnung ist kleiner bemessen als der Querschnitt der Einströmöffnung. Hierdurch ergibt sich eine Beschleunigung des hindurchströmenden Wassers, welches einen Beitrag zur Antriebsleistung bildet. Dabei ist die Leistungssteigerung durch Hindurchströmung von die Bootsantriebsschraube umgebendem Wasser in Folge der Drehbewegung der Bootsantriebsschraube über eine variable Eintrittsöffnung steuerbar.From the US 2003/0175120 A1 a generic boat propeller with machined in the propeller blades channels emerges. The individual propeller blades are cast and have a flow-optimized wing shape in cross-section. At the leading edge of each propeller blade there is a flat opening which forms the beginning of a channel narrowing in the course of the longitudinal extent of the propeller blade. At the rear edge of the propeller blade, this channel ends in an outflow opening. The cross section of the likewise flat outflow opening is smaller than the cross section of the inflow opening. This results in an acceleration of the water flowing through, which forms a contribution to the drive power. In this case, the power increase is controlled by flow of water surrounding the boat drive screw as a result of the rotational movement of the boat drive screw via a variable inlet opening.

Nachteilig bei diesem Stand der Technik erweist sich die Fertigungstechnik der Bootsantriebsschraube. Denn zur Erzeugung des propellerblattinternen Strömungskanals ist dieser nach dem Gießen der Antriebsschraube spanend einzubringen. Wegen der strömungsoptimalen Gestaltung wird die spanende Bearbeitung entsprechend aufwendig sein. Alternativ hierzu könnte der Strömungskanal allerdings auch beim Gießen mit erzeugt werden. Dies setzt jedoch eine entsprechend komplizierte Gießform mit entnehmbaren Formkernen voraus. Weiterhin sind gießtechnisch erforderliche Einlaufschrägen zu beachten.A disadvantage of this prior art proves the production technology of the boat propeller. Because to produce the propeller blade internal flow channel this is to introduce after the casting of the drive screw. Because of the flow-optimal design, the machining will be correspondingly expensive. Alternatively, the flow channel could, however, also be generated during casting. However, this requires a correspondingly complicated mold with removable mandrels. Furthermore, infeed slopes required by casting technology must be observed.

Es ist daher die Aufgabe der vorliegende Erfindung eine Bootsantriebsschraube mit in den Propellerblättern integrierten sich verengenden Kanälen zur Leistungssteigerung zu schaffen, welche sich einfach fertigen lässt und sich durch ein Maximum an Leistungssteigerung auszeichnet.It is therefore the object of the present invention to provide a boat propeller with integrated in the propeller blades narrowing channels to improve performance, which can be easily manufactured and is characterized by a maximum increase in performance.

Die Aufgabe wird ausgehend von einer Bootsantriebsschraube gemäß dem Oberbegriff von Anspruch 1 in Verbindung mit dessen kennzeichnendem Merkmalen gelöst. Die nachfolgen abhängigen Ansprüche geben vorteilhafte Weiterbildungen der Erfindung wieder.The object is achieved on the basis of a boat propulsion screw according to the preamble of claim 1 in conjunction with its characterizing features. The following dependent claims give advantageous developments of the invention again.

Die Erfindung schließt die technische Lehre ein, dass jedes Propellerblatt aus einem U-förmigen Metallblech hergestellt ist, dessen einander gegenüberliegende Schenkelseiten gemeinsam mit der Bodenseite den sich verengenden Kanal bilden.The invention includes the technical teaching that each propeller blade is made of a U-shaped metal sheet whose opposite leg sides together with the bottom side form the narrowing channel.

Der Vorteil der erfindungsgemäßen Lösung liegt insbesondere darin, dass von der Gießtechnik abgehend die Bootsantriebsschraube in ganz neuer Weise gefertigt wird. Es wurde erkannt, dass sich die an sich recht komplizierte Struktur eines Propellerblatts auch mit einem im Wesentlichen U-förmigen Metallblech nachbilden lässt, und zwar in nahezu strömungsoptimaler Weise. Somit lässt sich die erfindungsgemäße Bootsantriebsschraube als Schweißkonstruktion aus Blech fertigungstechnisch einfach herstellen. Hierdurch bedingt kommt weniger Material zum Einsatz, was auch das Eigengewicht der Bootsantriebsschraube vorteilhaft verringert. Zur Erzeugung eines gegenüber einer gegossenen Bootsantriebsschraube der hier interessierenden Art gleichen Drehmoments ist weniger Antriebsenergie erforderlich. Zur Erzeugung der gleichen Flüssigkeitsströmung ist zirka nur dreiviertel der ansonsten üblichen Energie erforderlich, wie Versuche ergaben. Die Reibungsverluste bei der erfindungsgemäßen Bootsantriebsschraube sind ebenfalls recht gering, da mit wesentlich geringeren Drehzahlen operiert wird. Da bei der erfindungsgemäßen Ausführung als Schweißkonstruktion weniger Kavitationserscheinungen zu erwarten sind, ist die Haltbarkeit der Komponenten höher als beim Stand der Technik. Mit der erfindungsgemäßen Bootsantriebsschraube lassen sich die Treibstoffkosten in zweistelliger Prozentgröße senken, was der Umwelt zu Gute kommt.The advantage of the solution according to the invention lies in particular in that, starting from the casting technique, the boat drive screw is manufactured in a completely new way. It has been recognized that the intrinsically complicated structure of a propeller blade can also be reproduced with a substantially U-shaped metal sheet, and in a manner which is almost optimal for flow. Thus, the boat propeller according to the invention can be produced as a welded construction made of sheet metal production technology. As a result, less material is used, which also advantageously reduces the weight of the boat propeller. In order to produce a torque equal to that of a cast boat drive screw of the type of interest here, less drive energy is required. To generate the same liquid flow is only about three quarters of the usual energy required, as experiments showed. The friction losses in the boat propeller according to the invention are also quite low, as it operates at much lower speeds. Since less cavitation phenomena are to be expected in the embodiment according to the invention as a welded construction, the durability of the components is higher than in the prior art. With the boat propeller according to the invention, the fuel costs can be reduced in two-digit percentage, which benefits the environment.

Zur Erzielung einer fertigungstechnisch besonders einfachen Ausführung wird vorgeschlagen, vorzugsweise jedes Propellerblatt am distalen Ende der Schenkelseiten mit dem Antriebsflansch zu verschweißen. Insoweit ist das distale Ende jedes Propellerblatts in Anpassung an die Kontur des Antriebswellenflanschen mit einer konkaven Kante versehen, um einen gleichmäßigen Schweißspalt zum Antriebswellenflansch hin zu erzielen. Die Schweißnaht kann als Kehlnaht ausgeführt werden, wobei die Nahtstärke nach dem an der Verbindungsstelle zwischen Propellerblatt und Antriebsflansch auftretenden Drehmoment zu dimensionieren ist.In order to achieve a manufacturing technology particularly simple embodiment is proposed, preferably to weld each propeller blade at the distal end of the leg sides with the drive flange. In that regard, the distal end of each propeller blade is fitted with a concave edge to conform to the contour of the drive shaft flanges to achieve a uniform weld gap to the drive shaft flange. The weld can be executed as a fillet weld, wherein the seam thickness is to be dimensioned according to the torque occurring at the connection point between the propeller blade and the drive flange.

Zur Bildung eines insgesamt U-förmigen Metallblechs für das Propellerblatt wird vorgeschlagen, dass die einander gegenüberliegenden Schenkelseiten aus einem Stanzbiegeteil bestehen, die an den Grenzstellen zur ebenfalls als Stanzbiegeteil ausgebildeten Bodenseite hin verschweißt sind. Die Bodenseite des Propellerblatts wird hierbei in Anpassung die außenradiale Schraubenform vorzugsweise gewölbt ausgeführt. Die Wölbung lässt sich in einfacher Weise durch Biegen herstellen.To form a total U-shaped metal sheet for the propeller blade is proposed that the opposite leg sides consist of a stamped and bent part, which are welded at the boundary points to also designed as a stamped bent part bottom side. The bottom side of the propeller blade is here performed in adaptation, the outer radial helical shape preferably arched. The curvature can be easily produced by bending.

Zur einfachen Erzeugung des sich entgegen der Drehrichtung verengenden Kanals innerhalb des Propellerblatts wird vorgeschlagen, das die einander gegenüberliegen Schenkelseiten des Propellerblatts in einen in Drehrichtung zunehmenden, das heißt entgegen der Drehrichtung abnehmenden, Abstand zueinander angeordnet sind. Dies lässt sich in besonders einfacher Weise durch entsprechendes Ausrichten der aus Blechteilen gefertigten Schenkelseiten des Propellerblatts in einer Schweißvorrichtung erzielen.For easy generation of the counter to the direction of rotation narrowing channel within the propeller blade is proposed that the opposing leg sides of the propeller blade in a direction of rotation increasing, that are opposite to the direction of rotation decreasing distance to each other. This can be achieved in a particularly simple manner by corresponding alignment of the leg sides of the propeller blade made of sheet metal parts in a welding device.

Zur weiteren Verbesserung der Strömungseigenschaften können die einander gegenüberliegenden Schenkelseiten jedes Propellerblatts auch gewellt geformt sein. Die Wellung lässt sich durch Biegen erzielen. Ebenfalls einer Verbesserung der Strömungseigenschaften kommt ein vorzugsweise konisch geformter Antriebswellenflansch zu Gute. Der Antriebswellenflansch lässt sich ebenfalls aus entsprechend geformtem Metallblech nach Art einer Schweißkonstruktion herstellen.To further improve the flow characteristics, the opposite leg sides of each propeller blade may also be wavy shaped. The curl can be achieved by bending. Also an improvement of the flow characteristics is a preferably conically shaped drive shaft flange to good. The drive shaft flange can also be produced from correspondingly shaped metal sheet in the manner of a welded construction.

Zur Gewährleistung einer optimalen Schweißbarkeit sollte das Metallblech des Propellerblatts und das des Antriebswellenflansches aus demselben legierten Stahl bestehen. Alternativ zum Schweißen eignet sich als stoffschlüssiges Verbindungsverfahren auch Hartlöten.To ensure optimum weldability, the metal sheet of the propeller blade and that of the drive shaft flange should be made of the same alloyed steel. As an alternative to welding, cohesive joining is also suitable for brazing.

Weitere die Erfindung verbessernde Maßnahmen werden nachstehend gemeinsam mit der Beschreibung eines bevorzugten Ausführungsbeispiels der Erfindung anhand der Figuren näher dargestellt. Es zeigt:

  • Fig. 1 eine perspektivische Ansicht einer Bootsantriebsschraube,
  • Fig. 2 eine Draufsicht auf die Bootsantriebschraube nach Fig. 1, und
  • Fig. 3 einen Längsschnitt der Bootsantriebsschraube nach Fig. 2 entlang des Schnitts A-A.
Further measures improving the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to FIGS. It shows:
  • Fig. 1 a perspective view of a boat propeller,
  • Fig. 2 a plan view of the boat propeller after Fig. 1 , and
  • Fig. 3 a longitudinal section of the boat propeller after Fig. 2 along the section AA.

Gemäß Fig. 1 besteht die Bootsantriebsschraube aus drei gegenüber eines Antriebswellenflansches 1 symmetrisch angeordneten Propellerblättern 2a bis 2c. Der Antriebswellenflansch 1 besteht aus einem konisch geformten Metallblech, an dem die Propellerblätter 2a bis 2c mit ihrem distalen Ende verschweißt sind.According to Fig. 1 the boat drive screw consists of three propeller blades 2a to 2c arranged symmetrically with respect to a drive shaft flange 1. The drive shaft flange 1 consists of a conically shaped metal sheet, on which the propeller blades 2a to 2c are welded with their distal end.

Jedes Propellerblatt 2a bis 2c ist aus einem U-förmigen Metallblech hergestellt, in dem ein sich von einer Einströmöffnung 3 ausgehend zu einer Ausströmöffnung 4 hin sich verengender Kanal 5 ausgebildet ist. Der Kanal 5 dient der Leistungssteigerung des Antriebs zur Erzeugung einer propellerblattinternen hohen Strömungsgeschwindigkeit aufgrund der Drehzahl der Propellerblätter 2a bis 2c.Each propeller blade 2a to 2c is made of a U-shaped metal sheet in which a channel 5, which narrows from an inflow opening 3 to an outflow opening 4, is formed. The channel 5 serves to increase the power of the drive to produce a propeller blade internal high flow rate due to the speed of the propeller blades 2a to 2c.

Der Kanal 5 ist in jedem Propellerblatt 2a bis 2c durch sich einander gegenüberliegende Schenkelseiten 6a und 6b eines Metallblechs mit einer hiermit verschweißten Bodenseite 7 gebildet.The channel 5 is formed in each propeller blade 2a to 2c by opposing leg sides 6a and 6b of a metal sheet having a bottom side 7 welded thereto.

Gemäß Fig. 2 ist die Bodenseite 7 jedes Propellerblatts 2a bis 2c in Schraubenumfangsrichtung gewölbt geformt, um günstige Strömungseigenschaften zu gewährleisten. Die Propellerblätter 2a bis 2c sind symmetrisch um den Antriebswellenflansch 1 angeordnet.According to Fig. 2 the bottom side 7 of each propeller blade 2a to 2c is curved in the circumferential direction of the screw in order to ensure favorable flow characteristics. The propeller blades 2a to 2c are arranged symmetrically about the drive shaft flange 1.

Gemäß Fig. 3 sind die gegenüberliegenden Schenkelseiten 2a und 2b jedes Propellerblatts 2a gewellt geformt, um den strömungsmechanischen Grundlagen entsprechend einen axialen Vortrieb der Bootsantriebsschraube in Folge Drehbewegung zu gewährleisten. Das Metallblech für den konisch geformten Antriebswellenflansch 1 sowie auch das Metallblech für die Propellerblätter 2a ff. weisen bei diesem Ausführungsbeispiel dieselbe Dicke auf und bestehen aus demselben legierten Stahl.According to Fig. 3 the opposite leg sides 2 a and 2 b of each propeller blade 2 a are corrugated in order to ensure, in accordance with the principles of fluid mechanics, axial propulsion of the boat propulsion screw as a result of rotational movement. The metal sheet for the conically shaped drive shaft flange 1 and the metal sheet for the propeller blades 2a ff. In this embodiment have the same thickness and consist of the same alloy steel.

Die Erfindung ist nicht beschränkt auf das vorstehend beschriebene bevorzugte Ausführungsbeispiel. Es sind vielmehr auch Abwandlungen hiervon denkbar, welche vom Schutzbereich der folgenden Ansprüche mit umfasst sind. So ist es beispielsweise auch möglich, die Bootsantriebsschraube mit nur zwei Propellerblättern auszuführen oder mehr als drei Propellerblättern. Die Anzahl der Propellerblätter richtet sich prinzipiell nach den Dimensionierungsparametern, wie Drehzahl, Antriebsleistung, Durchmesser.The invention is not limited to the preferred embodiment described above. On the contrary, modifications are conceivable which are included within the scope of the following claims. For example, it is also possible to run the boat propeller with just two propeller blades or more than three propeller blades. The number of propeller blades depends in principle on the dimensioning parameters, such as speed, drive power, diameter.

Weiterhin ist es auch möglich, den leistungssteigernden Kanal des Propellerblatts durch Einfügung weiterer Zwischenwände und Strömungsleitbleche zu modifizieren. Hierbei ist darauf zu achten, dass sich ein in Richtung Austrittsöffnung verengter Kanal ergibt, um die erfindungsgegenständliche Wirkung einer Leistungssteigerung herbeizuführen.Furthermore, it is also possible to modify the performance-enhancing channel of the propeller blade by inserting further intermediate walls and flow baffles. It is important to ensure that there is a narrowed in the direction of the outlet opening channel to bring about the invention-related effect of an increase in performance.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Antriebswellenflanschdrive shaft flange
22
Propellerblattpropeller blade
33
Einströmöffnunginflow
44
Ausströmöffnungoutflow
55
Kanalchannel
66
Schenkelseiteleg side
77
Bodenseitebottom side

Claims (8)

Bootsantriebsschraube mit mindestens zwei endseitig an einem Anriebswellenflansch (1) symmetrisch angeordneten Propellerblättern (2a, 2b, 2c), wobei an der Anströmkante jedes Propellerblatts (2a, 2b, 2c) eine Einströmöffnung (3) eines sich von hier aus verengenden Kanals (5) vorgesehen ist, der im Bereich der Rückkante des Propellerblatts (2a; 2b; 2c) in eine Ausströmöffnung (4) mündet, um eine Leistungssteigerung des Antriebs zu erzeugen,
dadurch gekennzeichnet, dass das Propellerblatt (2a; 2b; 2c) aus einem U-förmigen Metallblech hergestellt ist, dessen einander gegenüberliegenden Schenkelseiten (6a, 6b) gemeinsam mit der Bodenseite (7) den sich verengenden Kanal bilden.Boat drive screw having at least two propeller blades (2a, 2b, 2c) arranged symmetrically at the end on an axis of the propeller shaft (1), wherein at the leading edge of each propeller blade (2a, 2b, 2c) there is an inflow opening (3) of a narrowing channel (5). is provided, which opens in the region of the rear edge of the propeller blade (2 a, 2 b, 2 c) in an outflow opening (4) to produce an increase in power of the drive,
characterized in that the propeller blade (2a; 2b; 2c) is made of a U-shaped metal sheet whose opposite leg sides (6a, 6b) together with the bottom side (7) form the narrowing channel. Bootsantriebsschraube nach Anspruch 1,
dadurch gekennzeichnet, dass das Propellerblatt (2a; 2b; 2c) am distalen Ende der Schenkelseiten (6a,6b) mit dem Antriebswellenflansch (1) verschweißt ist.Boat drive screw according to claim 1,
characterized in that the propeller blade (2a; 2b; 2c) is welded to the drive shaft flange (1) at the distal end of the leg sides (6a, 6b). Bootsantriebsschraube nach Anspruch 1,
dadurch gekennzeichnet, dass die Schenkelseiten (6a, 6b) sowie die Bodenseite (7) aus Blechteilen bestehen, die zur Bildung des insgesamt U-förmigen Metallblechs miteinander im aneinandergrenzenden Teilbereich verschweißt sind.Boat drive screw according to claim 1,
characterized in that the leg sides (6a, 6b) and the bottom side (7) consist of sheet metal parts which are welded together to form the overall U-shaped metal sheet in the adjoining portion. Bootsantriebsschraube nach Anspruch 1 oder 3,
dadurch gekennzeichnet, dass die Bodenseite (7) des Propellerblatts (2a; 2b; 2c) in Schraubenumfangsrichtung gewölbt geformt ist.Boat drive screw according to claim 1 or 3,
characterized in that the bottom side (7) of the propeller blade (2a; 2b; 2c) is curved in the circumferential direction of the screw. Bootsantriebsschraube nach Anspruch 1,
dadurch gekennzeichnet, dass die einander gegenüberliegenden Schenkelseiten (6a, 6b) des Propellerblatts (2a; 2b; 2c) einen in Drehrichtung zunehmenden Abstand aufweisen, so dass sich der in Drehrichtung erweiterte Kanal (5) ergibt.Boat drive screw according to claim 1,
characterized in that the opposite leg sides (6a, 6b) of the propeller blade (2a; 2b; 2c) have a spacing which increases in the direction of rotation, so that the channel (5) extended in the direction of rotation results. Bootsantriebsschraube nach Anspruch 1,
dadurch gekennzeichnet, dass die einander gegenüberliegenden Schenkelseiten (6a, 6b) des Propellerblatts (2a; 2b; 2c) gewellt geformt sind.Boat drive screw according to claim 1,
characterized in that the opposite leg sides (6a, 6b) of the propeller blade (2a; 2b; 2c) are corrugated. Bootsantriebsschraube nach Anspruch 1,
dadurch gekennzeichnet, dass der Antriebswellenflansch (1) aus einem konisch geformten Metallblech besteht.Boat drive screw according to claim 1,
characterized in that the drive shaft flange (1) consists of a conically shaped metal sheet. Bootsantriebsschraube nach Anspruch 7,
dadurch gekennzeichnet, dass das Metallblech des Propellerblatts (2a; 2b; 2c) und das des Antriebswellenflanschs (1) aus demselben legierten Stahl besteht.Boat drive screw according to claim 7,
characterized in that the metal sheet of the propeller blade (2a; 2b; 2c) and that of the drive shaft flange (1) are made of the same alloyed steel.
EP08170610A 2007-12-05 2008-12-03 Boot drive screw Not-in-force EP2072392B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007058811A DE102007058811B4 (en) 2007-12-05 2007-12-05 Boat propeller

Publications (3)

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EP2072392A2 true EP2072392A2 (en) 2009-06-24
EP2072392A3 EP2072392A3 (en) 2010-09-29
EP2072392B1 EP2072392B1 (en) 2012-02-15

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ID=40500375

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Application Number Title Priority Date Filing Date
EP08170610A Not-in-force EP2072392B1 (en) 2007-12-05 2008-12-03 Boot drive screw

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EP (1) EP2072392B1 (en)
AT (1) ATE545579T1 (en)
DE (1) DE102007058811B4 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012155176A1 (en) * 2011-05-18 2012-11-22 R. & D. Ip Pty., Ltd. Turbo thrust propeller
FR2987657A1 (en) * 2012-03-05 2013-09-06 Carpyz TURBINE PROPELLER INTEGRATED IN THE THICKNESS OF THE PROFILE BLADES OF THE PROPELLERS

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030175120A1 (en) 2002-03-12 2003-09-18 St. Clair Alexander Sasha Aqua / atmos propellor jet

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1200162A (en) * 1966-05-24 1970-07-29 Robert Filmer Bridgland Improvements in blades for screw-propellers and lifting rotors
DE2322599A1 (en) * 1972-05-12 1973-11-15 Gen Signal Corp Paddle wheel or propeller
WO2003093101A1 (en) * 2002-04-29 2003-11-13 Rolls-Royce Naval Marine, Inc. Propeller

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030175120A1 (en) 2002-03-12 2003-09-18 St. Clair Alexander Sasha Aqua / atmos propellor jet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012155176A1 (en) * 2011-05-18 2012-11-22 R. & D. Ip Pty., Ltd. Turbo thrust propeller
FR2987657A1 (en) * 2012-03-05 2013-09-06 Carpyz TURBINE PROPELLER INTEGRATED IN THE THICKNESS OF THE PROFILE BLADES OF THE PROPELLERS

Also Published As

Publication number Publication date
DE102007058811A1 (en) 2009-06-18
ATE545579T1 (en) 2012-03-15
EP2072392B1 (en) 2012-02-15
DE102007058811B4 (en) 2009-12-24
EP2072392A3 (en) 2010-09-29

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