DE20320626U1 - Blade connection for the rotor blades of a wind energy plant - Google Patents

Blade connection for the rotor blades of a wind energy plant Download PDF

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Publication number
DE20320626U1
DE20320626U1 DE20320626U DE20320626U DE20320626U1 DE 20320626 U1 DE20320626 U1 DE 20320626U1 DE 20320626 U DE20320626 U DE 20320626U DE 20320626 U DE20320626 U DE 20320626U DE 20320626 U1 DE20320626 U1 DE 20320626U1
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Prior art keywords
insert
hub
blade
laminate layers
rotor blades
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Expired - Lifetime
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DE20320626U
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German (de)
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Aerodyn Engineering GmbH
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Aerodyn Engineering GmbH
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Priority to DE20320626U priority Critical patent/DE20320626U1/en
Publication of DE20320626U1 publication Critical patent/DE20320626U1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/24—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least three directions forming a three dimensional structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
    • B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Composite Materials (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

Blattanschluss für die Rotorblätter einer Windenergieanlage, bei der die Rotorblätter und/oder die Nabe mit wenigstens einem Insert (1) aus einem festen Material versehen sind, das in die Wurzel des Rotorblatts bzw. in die Flansche der Nabe des bzw. der aus einem Faserverbundwerkstoff gefertigten, aus mehreren aufeinander gelegten Laminatschichten (3) bestehenden Rotorblatts bzw. Nabe eingesetzt ist und das mit der Nabe bzw. dem Rotorblatt der Windenergieanlage über in Gewindebohrungen in den Inserts eingeschraubte Bolzen (7) verbunden ist, dadurch gekennzeichnet, dass
– das wenigstens eine Insert (1) im Querschnitt konisch ausgebildet ist,
– die Umfangsfläche des wenigstens einen Inserts (1) mit einer Mehrzahl von Erhöhungen und/oder Aussparungen (2) versehen ist,
– die sich parallel zu dem Insert (1) erstreckenden Laminatschichten (3) im Bereich des Inserts (1) mit einem zu dem Profil des wenigstens einen Inserts (1) komplementären Profils ausgebildet sind, und
– die Laminatschichten (3) im Bereich des...Blade connection for the rotor blades of a wind energy plant, in which the rotor blades and / or the hub are provided with at least one insert (1) of a solid material, which in the root of the rotor blade or in the flanges of the hub of the one or more fiber composite material manufactured, consisting of several superimposed laminate layers (3) existing rotor blade or hub and is connected to the hub or the rotor blade of the wind turbine via screwed into threaded holes in the inserts bolt (7), characterized in that
- The at least one insert (1) is conical in cross-section,
The peripheral surface of the at least one insert (1) is provided with a plurality of elevations and / or recesses (2),
- Which are formed parallel to the insert (1) extending laminate layers (3) in the region of the insert (1) with a profile to the at least one insert (1) complementary profile, and
- the laminate layers (3) in the area of the ...

Figure 00000001
Figure 00000001

Description

Die Erfindung betrifft einen Blattanschluss für die Rotorblätter einer Windenergieanlage, bei der die Rotorblätter bzw. die Nabe mit wenigstens einem Insert aus einem festen Material versehen sind, das in die Wurzel des bzw. der aus einem Faserverbundwerkstoff gefertigten, aus mehreren aufeinander gelegten Laminatschichten gefertigten Rotorblatts bzw. der Nabe eingesetzt ist und das mit der Nabe bzw. dem Rotorblatt der Windenergieanlage über Bolzen verbunden ist, die in Innengewindebohrungen in den Inserts eingeschraubte Bolzen verbunden sind.The The invention relates to a blade connection for the rotor blades of a Wind energy plant, in which the rotor blades or the hub with at least an insert of a solid material provided in the Root of or made of a fiber composite material, made of several superimposed layers of laminate rotor blade or the hub is inserted and that with the hub or the rotor blade the wind turbine over Bolt is connected in internally threaded holes in the inserts screwed bolts are connected.

Die Energieerzeugung durch eine Windenergieanlage beruht auf der Wandlung der translatorischen Luftbewegungsenergie in rotatorische Energie, die über Rotorblätter erfolgt. Die Rotorblätter der Windenergieanlage sind an ihrem Wurzelende mit einer Rotornabe verbunden, und zwar wahlweise direkt oder über ein zwischen Rotorblatt und Rotornabe angeordnetes Blattlager. Rotornabe und Rotorblätter bilden gemeinsam den Rotor.The Energy production by a wind energy plant is based on the transformation the translational air movement energy into rotational energy, the above rotor blades he follows. The rotor blades The wind turbine is at its root end with a rotor hub connected, either directly or via a between rotor blade and Rotor hub arranged leaf bearing. Rotor hub and rotor blades form together the rotor.

Bei dieser Wandlung der translatorischen Luftbewegungsenergie in Rotationsenergie entstehen an der Verbindung zwischen dem Rotorblatt und der Rotornabe, dem sogenannten Blattanschluss, große statische und dynamische Biegemomente, die damit verbundenen Zug- und Druckkräfte müssen von dem Blattanschluss übertragen werden.at this conversion of the translational air movement energy into rotational energy arise at the connection between the rotor blade and the rotor hub, the so-called blade connection, great static and dynamic Bending moments, the associated tensile and compressive forces must be of transferred to the blade connection become.

Es ist bereits bekannt, in den Laminataufbau der Blattwurzel Inserts einzukleben, die aus einem Metall oder aber einem anderen festen Material gefertigt sind. Dabei stellt sich das Problem, dass bei derart eingeklebten Inserts die Kräfte nur über die Verklebungsfläche übertragen werden, die Oberfläche der Inserts muss daher groß dimensioniert sein.It is already known in the laminate construction of the leaf root inserts glue, which is made of a metal or another solid Material are made. This raises the problem that in such glued inserts inserts the forces only over transfer the bond area become, the surface the inserts must therefore be large be.

Der Erfindung liegt die Aufgabe zugrunde, einen Blattanschluss zu schaffen, die eine Übertragung auch hoher Zug- und Druckkräfte erlaubt.Of the Invention has for its object to provide a blade connection, the one transmission too high tensile and compressive forces allowed.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Hauptanspruches gelöst. Die Unteransprüche geben vorteilhafte Ausgestaltungen der Erfindung an.According to the invention this Problem solved by the features of the main claim. The under claims indicate advantageous embodiments of the invention.

Insbesondere, dass das wenigstens einem Insert im Querschnitt konisch ausgebildet ist, die Umfangsfläche des wenigstens einen Inserts mit einer Mehrzahl von Erhöhungen und/oder Aussparungen versehen ist, sich parallel zu dem Insert erstreckende Laminatschichten im Bereich des Inserts mit einem zu dem Profil des wenigstens einen Inserts komplementären Profils ausgebildet sind, und die Laminatschichten im Bereich des Inserts senkrecht zu ihrer Erstreckung miteinander vernäht sind, löst die Aufgabe.Especially, in that the at least one insert has a conical cross section is, the peripheral surface the at least one insert with a plurality of elevations and / or Recesses is provided, parallel to the insert extending laminate layers in the area of the insert with a to the profile of at least one Complementary inserts Profiles are formed, and the laminate layers in the field of Inserts are sewn together perpendicular to their extent, solve the Task.

Fas Insert kann vollringförmig ausgebildet sein, es können aber auch zwei halbringförmig ausgebildete Inserts oder eine Vielzahl von ringsegmentförmigen Inserts vorgesehen sein.Fas Insert can be full ring be able to do it but also two semi-annular formed inserts or a plurality of ring segmented inserts be provided.

Die Erfindung wird im Folgenden anhand einer Zeichnung erläutert. Dabei zeigt:The Invention will be explained below with reference to a drawing. there shows:

1 ein Insert im Querschnitt, wobei dieses auf der einen Seite den (auf der anderen Seite nicht dargestellten) Aufbau der vernähten Laminatschichten wiedergibt, 1 an insert in cross-section, which on one side represents the construction of the sewn laminate layers (not shown on the other side),

2 eine erste Detaildarstellung aus 1, und 2 a first detail view 1 , and

3 eine zweite Detaildarstellung aus 1. 3 a second detail view 1 ,

Das – vorzugsweise metallische – Insert 1 ist in seiner Grundstruktur konisch. Seine Umfangsfläche ist mit einer Mehrzahl von Erhöhungen und Aussparungen 2 versehen. Das Insert 1 ist in einen aus einem Faserkunststoffverbund bestehenden Laminataufbau 3 eingebettet. Dieser Laminataufbau ist im Bereich des Inserts 1 mit unterschiedlichen Nähten versehen, nämlich mit einer Montage- und Positionierungsnaht 4, die eine verbesserte Kraftanleitung in den Laminataufbau 3 erlaubt. Eine ILS-Naht erhöht die interlaminare Scherfestigkeit der Laminatschichten. Eine Endmontagenaht 6 dient zum Schutz vor Delaminationen des Faserkunststoffverbundes im Bereich des Innengewindes 7, das mittig in das Insert 1 eingebracht ist.The - preferably metallic - insert 1 is conical in its basic structure. Its peripheral surface is with a plurality of elevations and recesses 2 Mistake. The insert 1 is in a laminate structure consisting of a fiber-plastic composite 3 embedded. This laminate construction is in the area of the insert 1 provided with different seams, namely with an assembly and positioning seam 4 providing improved force guidance in the laminate construction 3 allowed. An ILS seam increases the interlaminar shear strength of the laminate layers. A final assembly seam 6 serves to protect against delaminations of the fiber-reinforced plastic composite in the area of the internal thread 7 , which is centered in the insert 1 is introduced.

Ein zusätzlich eingebrachtes Faserverstärkungsmaterial 8 bildet den Formschluß mit den Erhöhungen und Aussparungen 2 in dem Laminataufbau.An additionally introduced fiber reinforcement material 8th forms the positive connection with the elevations and recesses 2 in the laminate construction.

Das Insert 1 kann als Vollring mit sich nach innen verjüngendem Querschnitt ausgebildet sein, es ist jedoch auch möglich, diesen halbringförmig auszubilden oder aber eine Vielzahl von ringsegmentförmigen Inserts vorzusehen.The insert 1 may be formed as a solid ring with inwardly tapering cross section, but it is also possible to form this semi-annular shape or provide a plurality of ring segment-shaped inserts.

Es ist möglich – ohne dass die Erfindung darauf beschränkt wäre – einen noch ungetränkten Vorformling zunächst unter geeignetem Vernähen der Fasergelege zu fertigen, das Insert einzusetzen und sodann das Harz zu infundieren oder zu injizieren, wodurch der Formschluß zwischen den Laminatschichten und dem Profil des Inserts hergestellt wird.It is possible - without that the invention is limited thereto would be - one still soaked Preform first under suitable sewing make the fiber fabric, insert the insert and then the To infuse resin or inject resin, reducing the positive between the laminate layers and the profile of the insert is made.

Es ist jedoch auch möglich, in – an sich bekannter Weise – die Hälften des Rotorblattes in einer Halbschale herzustellen, die Laminatschichten der Blattwurzel mit einem im Bereich des Inserts diesem komplementär entsprechenden Profil auszugestalten, das halbringförmige Insert sodann einzusetzen und anschließend die beiden Hälften des Rotorblatts aufeinander zu legen.However, it is also possible - in a manner known per se - to produce the halves of the rotor blade in a half shell, to design the laminate layers of the blade root with a profile corresponding thereto in the region of the insert, then insert the semi-annular insert and then the two halves of the rotor blade to put on each other.

Eine dritte Möglichkeit besteht darin, eine Vielzahl von einzelnen Inserts vorzusehen, die in das vorgeformte Profil des Vorformlings des Rotorblatts bzw. der Nabe eingesetzt werden und den Formschluß sodann durch Injizieren oder Infundieren des Harzes herzustellen.A third possibility is to provide a plurality of individual inserts, the in the preformed profile of the preform of the rotor blade or the hub are used and then the positive engagement by injecting or Infusing the resin produce.

Die konische Ausbildung der Inserts erleichtert zum einen das Einbringen in die noch ungetränkten, aber bereits miteinander vernähten Fasergelege, es bewirkt zum anderen, dass Kraftsprünge zwischen dem Insert und dem Laminat vermieden werden.The Conical training of the inserts facilitates the introduction of a into the still soaked, but already sewn together Fasergelege, it causes, on the other hand, that force jumps between the insert and the laminate are avoided.

Claims (4)

Blattanschluss für die Rotorblätter einer Windenergieanlage, bei der die Rotorblätter und/oder die Nabe mit wenigstens einem Insert (1) aus einem festen Material versehen sind, das in die Wurzel des Rotorblatts bzw. in die Flansche der Nabe des bzw. der aus einem Faserverbundwerkstoff gefertigten, aus mehreren aufeinander gelegten Laminatschichten (3) bestehenden Rotorblatts bzw. Nabe eingesetzt ist und das mit der Nabe bzw. dem Rotorblatt der Windenergieanlage über in Gewindebohrungen in den Inserts eingeschraubte Bolzen (7) verbunden ist, dadurch gekennzeichnet, dass – das wenigstens eine Insert (1) im Querschnitt konisch ausgebildet ist, – die Umfangsfläche des wenigstens einen Inserts (1) mit einer Mehrzahl von Erhöhungen und/oder Aussparungen (2) versehen ist, – die sich parallel zu dem Insert (1) erstreckenden Laminatschichten (3) im Bereich des Inserts (1) mit einem zu dem Profil des wenigstens einen Inserts (1) komplementären Profils ausgebildet sind, und – die Laminatschichten (3) im Bereich des Inserts (1) senkrecht zu ihrer Erstreckung miteinander vernäht sind.Blade connection for the rotor blades of a wind turbine, in which the rotor blades and / or the hub with at least one insert ( 1 ) are made of a solid material, which is in the root of the rotor blade or in the flanges of the hub of the or of a fiber composite material, made of a plurality of stacked laminate layers ( 3 ) existing rotor blade or hub is used and that with the hub or the rotor blade of the wind turbine via screwed into threaded holes in the inserts bolt ( 7 ), characterized in that - the at least one insert ( 1 ) is conical in cross-section, - the peripheral surface of the at least one insert ( 1 ) with a plurality of elevations and / or recesses ( 2 ), which are parallel to the insert ( 1 ) extending laminate layers ( 3 ) in the area of the insert ( 1 ) to the profile of the at least one insert ( 1 ) are formed complementary profile, and - the laminate layers ( 3 ) in the area of the insert ( 1 ) are sewn together perpendicular to their extension. Blattanschluss nach Anspruch 1, dadurch gekennzeichnet, dass ein vollringförmig ausgebildetes Insert (1) vorgesehen ist.Blade connection according to claim 1, characterized in that a full ring-shaped insert ( 1 ) is provided. Blattanschluss nach Anspruch 1, dadurch gekennzeichnet, dass zwei halbringförmig ausgebildete Inserts (1) vorgesehen sind.Blade connection according to claim 1, characterized in that two half-ring-shaped inserts ( 1 ) are provided. Blattanschluss nach Anspruch 1, dadurch gekennzeichnet, dass eine Vielzahl von ringsegmentförmigen Inserts (1) vorgesehen sind.Blade connection according to claim 1, characterized in that a plurality of ring segment-shaped inserts ( 1 ) are provided.
DE20320626U 2002-03-28 2003-03-27 Blade connection for the rotor blades of a wind energy plant Expired - Lifetime DE20320626U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE20320626U DE20320626U1 (en) 2002-03-28 2003-03-27 Blade connection for the rotor blades of a wind energy plant

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10214340A DE10214340C1 (en) 2002-03-28 2002-03-28 Blade connection for the rotor blades of a wind turbine and method for its production
DE10214340.4 2002-03-28
DE20320626U DE20320626U1 (en) 2002-03-28 2003-03-27 Blade connection for the rotor blades of a wind energy plant
PCT/DE2003/001023 WO2003082551A1 (en) 2002-03-28 2003-03-27 Blade connection for the rotor blades of a wind-energy turbine and a method for the production thereof

Publications (1)

Publication Number Publication Date
DE20320626U1 true DE20320626U1 (en) 2005-02-10

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DE20320626U Expired - Lifetime DE20320626U1 (en) 2002-03-28 2003-03-27 Blade connection for the rotor blades of a wind energy plant

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DE (2) DE10214340C1 (en)
WO (1) WO2003082551A1 (en)

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WO2008145105A2 (en) * 2007-05-31 2008-12-04 Eurocopter Deutschland Gmbh Method for producing construction elements of fibre-reinforced plastic materials
WO2009050547A2 (en) * 2007-09-24 2009-04-23 Blue H Intellectual Properties Cyprus Limited Conversion system of off-shore wind energy suitable for deep water
WO2010041008A1 (en) * 2008-10-08 2010-04-15 Blade Dynamics Limited An insert and method for forming an end connection in a uni -axial composite material
DE102014215390B3 (en) * 2014-08-05 2015-11-05 Bayerische Motoren Werke Aktiengesellschaft Arrangement with a metallic connection element and a fiber composite material
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EP2078851A1 (en) 2008-01-14 2009-07-15 Lm Glasfiber A/S Wind turbine blade and hub assembly
GB2465167A (en) * 2008-11-07 2010-05-12 Vestas Wind Sys As A turbine blade having mounting inserts of different lengths
US8066490B2 (en) 2009-12-21 2011-11-29 General Electric Company Wind turbine rotor blade
DE102010010283A1 (en) 2010-03-04 2011-09-08 Deutsches Zentrum für Luft- und Raumfahrt e.V. Rotor hub in fiber composite construction for wind turbines
DE102010017062B4 (en) * 2010-05-21 2019-07-11 Thyssenkrupp Steel Europe Ag Rotor blade of a wind turbine
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NL2012326C2 (en) 2014-02-25 2015-08-26 Viventus Holding B V BUS INTENDED FOR DIRECT OR INDIRECT CONNECTION OF A LEAF ROOT OF A WIND TURBINE TO A HUB OF A TURBINE.
EP2952734B1 (en) 2014-06-05 2021-04-07 Siemens Gamesa Renewable Energy A/S A root bushing for a blade root of a wind turbine rotor blade, a blade root, a wind turbine rotor blade and a wind turbine
DE102014221966B4 (en) 2014-10-28 2018-07-12 Senvion Gmbh Method for producing a rotor blade of a wind energy plant
US9745956B2 (en) 2014-12-10 2017-08-29 General Electric Company Spar cap for a wind turbine rotor blade
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