DE202011105711U1 - Small wind turbine and device for actively adjusting a blade of a (small) wind turbine - Google Patents

Abstract

Device (1) for the active adjustment of a blade (54) of a (small) wind energy installation (50), expediently for wind energy installations (50) with a total output of less than 250 kW, in particular even less than 200 kW, characterized in that each The device or assembly (1) is designed as, for example, a compact assembly (1) which is essentially protected by a housing, in particular an assembly (1) protected by a circular or cylindrical housing with possibly existing openings, which enables the active adjustment of a blade ( 54), whereby each leaf (54) can be actively adjusted by an adjusting mechanism (2) inside the assembly and independently of the respective adjustment of the possibly existing further leaves (54).

Description

The invention relates to a system or a device for actively adjusting a sheet of a small wind energy plant, in particular for wind turbines with a total power of less than 250 kW, in particular even less than 200 kW, according to the protection claims. Likewise, a small wind turbine system is described, which contains several such devices according to the invention.

The invention provides a compact assembly which enables the active and individual adjustment of one blade each. Each such device is designed as a compact and ready-to-install assembly which can be attached to the shaft of the blade, between the hub and blade, each blade actively and independently of the respective adjustment of the other existing leaves adjusted by a separate mechanism inside the assembly can be.

State of the art and demarcation:

Currently there are wind turbines, also wind turbines or wind power converters (short: "WEA" or "WKK"), called, in various designs, sizes and shapes. Large wind turbines are currently being offered, designed, manufactured and installed in mass production by about a dozen well-known and internationally represented large manufacturers. According to a project by the Augsburg University of Applied Sciences (Hafner, Moutzouris [-]), the project planning of large wind turbines (among others, GROWIAN stands for a large wind turbine project of a two-blade plant) dates back to the 1970s and 1980s. At that time, the Federal Ministry for Research and Technology (BMFT) began to promote research in the wind power sector. A specially founded GmbH from three energy supply companies, HEW, RWE and SCHLESWAG, was able to commission a 3.0 MW GROWIAN plant in the north German Elbe estuary in January 1983. Even today, such modern large wind turbines are often associated in waters near the coast or in the sea (English: "offshore wind farms"), as well as on land (English: "onshore"). Important when choosing a location is a region with higher wind speeds. The energy yield of such modern large wind turbines is usually up to a few megawatts. Modern large wind turbines can reach between at least 0.5 MW and about max. 7.5 MW.

Previous large wind turbines as well as smaller wind turbines from the beginning of wind energy use (for example, the mentioned GROWIAN plant, the Monopteros plant, or the 10 kW to 30 kW MAN Aeroman plants, etc.) had one, two to n times the number of installed rotor blades, Today, however, for reasons of noise and optical reasons, the standard design with 3 sheets has prevailed.

In addition to these large wind turbines, the market for smaller wind turbines or smaller wind turbines (short: "small-WEA" or "KWEA"), which in the form of traditional "Holland" windmills, the two-bladed "Hütter rotors" of 1957 or the American Farm wind (power) wheels (compare also the approx .. 20 meters high 12 KW plant in the American Cleveland of 1887) already since the history existed, further developed. On the one hand, such smaller systems deliver a lower energy yield than large wind turbines, but on the other hand are simpler and less expensive to produce, assemble, and maintain. Small wind turbines, sometimes referred to as wind generators, have significantly lower characteristics in terms of size, energy yield (performance), and material costs as large wind turbines and are, for example, as home or small wind turbines for generating electrical energy, such as for the grid-independent operation of low voltage equipment in operation. Small wind turbines are often separated from the regular mass-produced large wind turbines by individual designs and a higher variety in design. For example, shows the DE 102 52 759 Such a non-standard small wind turbine, especially with self-regulating canvas-like rotor blades for the purpose of energy production for individual customers, for example, for heating hot water systems in households and businesses and for the operation of water pumps. Another distinguishing feature between the above-mentioned modern large wind turbines is the hub height, which is always possible in large wind turbines in linear flow areas, while small wind turbines are set up or mounted due to the usually low altitude in turbulent flow areas on the ground. The DE 10 2009 015 669 describes, for example, the generic term of a small wind turbine, consisting of an impeller hub and blades of an axial impeller, a generator and a trailer, which is installed in, on, on or between buildings. In addition, small wind turbines have rotor diameters of usually up to about 20 meters. Since (less) the use of material predominates for small wind turbines, the initial costs are also significantly lower than for large wind turbines. Typical small wind turbines are erected on production sites, or on agricultural land, or even on the domestic grounds of individual consumers who live away from installed power grids. Often small wind turbines are therefore also as Energy sources used for stand-alone solutions for grid-autonomous operation.

The demarcation between large wind turbine and small wind turbine are currently not yet clear. As a rule, on the Standard EN 61400-2 referenced or made a distinction based on hub height or performance.

• – Micro-Windturbinen (Maximal 1,5 kW Nennleistung bzw. 6 m² Windangriffsfläche)
• – Hausanlagen auf dem Dach oder direkt mit dem Haus verbunden als Nebengebäude ohne Größenbeschränkungen dem Gebäude angepasst
• – Kleinwindanlagen zur Selbstversorgung bis einschließlich 6 kW Nennleistung
• – Kleinwindanlagen bis maximal 200 m² Windangriffsfläche ( EN 61400-2 ).

This is what the Federal Association for Small Wind Turbines calls BVKW ( Bundesverband Kleinwindanlagen [2010] ) many different definitions up to 500 kW rated power for small wind turbines. The Federal Association of Small Wind Turbines is (still) aiming at a definition agreed upon in Europe according to the following classification. Small wind turbines are wind-driven systems with a wind attack area of up to 200 m ² (described in EN 61400-2 ). The small wind turbines are divided within this standard standard into:

• - Micro wind turbines (maximum rated power of 1.5 kW or 6 m ² windfall area)
• - House facilities on the roof or directly connected to the house as an outbuilding without size limitations adapted to the building
• - Small wind turbines for self-supply up to and including 6 kW nominal power
• - Small wind turbines up to a maximum of 200 m ² windage area ( EN 61400-2 ).

The second chairman of the Bundesverband Kleinwindanlagen BVKW ( Schwieger, Hahn, BVKW [2011] ) recently defined his point of view on the demarcation of KWEA in an interview: "Due to the different construction legislation in the federal states, there were no uniform criteria for KWEAs. Increasingly, however, the definition is based on the Europe-wide valid Standard EN 61400-2 through, the small wind turbines up to 200 m ² rotor surface (16 m rotor diameter) defined. They are divided into 2 classes: up to 40 m ² rotor area and from 40 to 200 m ² . Essential is also the height. In the meantime almost all federal states define the so-called "spatial meaning" for buildings from 30 m height. In other words, small wind turbines under 30 m (measured to the wing tip) do not affect the spacious landscape. They are no higher than a larger tree population, so they can integrate harmoniously into the environment, especially if they are designed visually appealing. By contrast, modern large wind turbines can reach a height of over 180 m and more than 10,000 m ^{2 of} rotor area.

The Federal Wind Energy Association e. V. (BWE), on the other hand, classifies small wind turbines essentially according to their power and goes as far as 200 kW. "

Also Hughes, Leovac, Mayr, et. al [2008] point to the IEC standard 61400-2 which defines the boundary between small and large wind turbines. According to this standard, a plant with less than 200 m ² rotor area and a specific power of 350 W / m ^{2 is} classified as a small wind turbine.

Apart from the different sizes for large wind turbines and KWEA, the following basic components are always present in modern KWEA according to the standard design with 3 rotor blades as well as in modern large wind turbines according to the standard design with 3 rotor blades.
First: tower / mast / uprising structure. Second: Gondola or machine carrier / machine house with integrated or connected energy converter / generator. Third, hub. Fourth: Several rotor blades, each arranged at the same angular distance from each other and each connected to the hub. Fifth: brake. Sixth: Ggfs. Sensors / instruments for wind / flow determination and, if necessary, seventh: Actuator (s) for optimal readjustment / rotation of the system into the wind or out of the wind.

An important delimitation criterion between large wind turbines and small wind turbines, which is hardly mentioned in literature or standardization, is the accessibility of the system. Large wind turbines according to the modern standard design are therefore always accessible on the inside, that is, the nacelle or the nacelle is usually via a ladder (in the tower) for persons, such as technical service personnel, reachable. For example, service technicians can carry out repair and maintenance work in the nacelle or engine house. Modern KWEA according to the standard design, however, are in the nacelle or the machine carrier or the tower / mast regularly not walkable.

Small wind turbines are, however, by far not only discussed and classified, developed and designed in Germany: A typical international supplier of (non-accessible) small wind turbines is the Irish company C & F Green Energy. For example, the technical data for a 50 kW KWEA supplied by the supplier are included (CFGREENENERGY, C50 [2011]): Rotor diameter: 20 m. Hub height: 29 m. Max. Power: 50 kW.

• – Leistung der Anlage: mehr als ca. 200 kW bis 250 kW oder
• – Rotordurchmesser: mehr als ca. 20 m oder
• – Nabenhöhe: mehr als ca. 40 m oder
• – max. Bauhöhe (inkl. Flügelradius): mehr als ca. 50 m oder
• – Begehbarkeit der Windenergieanlage, beziehungsweise der Gondel oder des Maschinenträgers.

In the context of the present description, as a guideline for the demarcation between large wind turbines and small wind turbines, summarizing the above findings, the following limit values are finally adopted:

• - Performance of the system: more than about 200 kW to 250 kW or
• - Rotor diameter: more than about 20 m or
• - hub height: more than about 40 m or
• - Max. Overall height (including vane radius): more than approx. 50 m or
• - Accessibility of the wind turbine, or the nacelle or the machine carrier.

Modern wind turbines with several leaves, for example, according to the standard design with 3 leaves, where these above limits or criteria are not met, are therefore considered in the sense of the present elaboration basically as small wind turbines (KWEA).

Technical problem and current disadvantages and problems:

In large wind turbines, various mechanisms exist for adjusting (English: "pitching") of the leaves. The general task is, depending on the prevailing wind conditions, to ensure the best possible operation of the wind turbine and, in the event of an emergency, such as the loss of the drive train, to enable an immediate emergency adjustment.

These various blade adjustment mechanisms are i. A. not obligatory, but strong and increasingly widespread in large wind turbines.

After Hau ( ETAPLAN, Hau [2003] ) large wind turbines usually have rotors with blade pitch control. The primary task (the blade pitch mechanism) is the adjustment of the blade pitch for power and speed control of the rotor. The type of Blattverstellantriebes forms the essential distinguishing feature of Blattverstellsysteme. Basically, hydraulic or electric adjusting drives are in use. After Adelhardt ( Adelhardt [2011] ) wind turbines with a capacity of up to 5.0 MW must adapt their orientation to the wind conditions. The tower and rotor blades are adjusted so that they make optimum use of the wind conditions and at the same time are not subjected to extreme loads that could lead to damage. Tower and blade adjustment are thus an essential prerequisite for the profitability of wind turbines.

Prof. Dr. R. Simon explains ( Simon, Riederer, Meurer [2010], page 20 ) the effect of pitching / pitch adjustment for the purpose of power limitation to prevent damage to the large wind turbine: "(...) In pitch-controlled systems, the power limitation is achieved by adjusting the pitch on the rotor blades. By a low angle of attack on the rotor blades a small buoyancy force is generated. The rotor blades rotate slower and the system performance is correspondingly low. At weak wind speeds of 0-4 m / s, the leaves are in the flag position. The pitch angle is 90 °. If the wind speed increases, the angle of attack is set to 0 °. With strong winds of 13 to 25 m / s, the system must be limited in its performance. The pitch angle increases with increasing wind speed and is in the range of 0-30 °. If the system has to be switched off, the rotor blades return to the feathered position. Another way to limit the performance of a wind turbine is Active Stall Control. Here, the stall effect is generated by the rotation of the rotor blades. The rotor blade rotation is similar to the pitch system, but in the rotor plane and with a smaller angle of attack. For very small wind turbines, the power limitation is often caused by a cross-flag. (...) "

In modern large wind turbines exist possibilities of single blade adjustment. An individual and cyclic blade adjustment in wind turbines is recommended, because due to the very large rotor diameter (in some cases more than 120 m in diameter) the blades are exposed to different altitudes and thus to different wind speeds even during one revolution.

This individual or single-blade adjustment is usually made possible in particular by the fact that in large wind turbines sufficient space is available to install Verstellaggregate- and mechanisms or to integrate into the system. In large wind turbines, in contrast to KWEA, large rolling bearings are generally used, by which the relative adjustment of the blade to the adjacent construction can be realized. For example, companies specializing in slewing bearings, such as the wind energy division of the IMO group of companies, manufacture slewing bearings for the adjustment of rotor blades, slewing rings up to an outside diameter of 4,000 and larger. These are always multi-row slewing bearings according to the current state of development, for example described by the DE 20 2007 011 577 U1 IMO or IMO DE 10 2008 009 740 , In large wind turbines the blade adjustment is done by actuators.

After Hau ( ETAPLAN, Hau [2003] ), the type of actuators depends on the one hand on the type of selected drive units (electric or hydraulic), and on the other by the spatial arrangement of the Blattverstellantriebs in the nacelle or in the rotor hub. Right on the leaves acting, hydraulic actuating cylinders are insofar the simplest solution, as they are both power units and actuators. If other adjusting drives are used instead of directly acting adjusting cylinders, there is the need to bring about the adjusting movements for the rotor blades via mechanical adjusting elements.

Blattverstellmöglichkeiten for (large) wind turbines from the 1990s to about today, for example, shown in the prior art, for example listed in the DE 10 2004 046 260 the company NORDEX, the DE 10140793 from GENERAL ELECTRIC, the DE 10146968 from BOSCH, the DE 19644705 the PREUSSAG, DE 4221783 by Prof. Klinger or in the DE 10044262 , One type of design of today's electrical coupling is shown in the DE 10 2006 023 411 from BOSCH. Older adjustment options according to the today no longer usual active-stable principle, for the purpose of completeness, in the DE 19626402 by AERODYN from the mid-1990s.

In modern KWEA, however, there is the possibility of a single blade adjustment (at least due to the very limited space) so far not. This leads to disadvantages in yield and thus in economic efficiency of KWEA. This is clearly disadvantageous in practice.

Hau leads in his compendium ( ETAPLAN, Hau [2003], page 353, cf. Figure 9.33 ) an image / drawing example of the Blattverstellmöglichkeiten a KWEA type Aeroman, which indicates a possibility to realize by means of actuators a pitch adjustment. The patent documents DE 3544814 such as EP 0226052 , which were submitted by the company MAN at the time when the MAN Aeroman was produced, show the then prevailing in the 1980s technology of a hub in cross-section.

At KWEA, the adjustment options are different compared to large wind turbines. As mentioned, no mutually rotatable rolling bearing rings in the form of rotary joints or moment bearings are used here in order to realize a blade adjustment. Also directly acting hydraulic actuating cylinders are not used. A modern individual blade adjustment is basically not carried out at KWEA. Such is usually hardly feasible due to the smaller space available within the machine frame. So far, a blade adjustment is due to the minimal space in KWEA therefore occasionally by means of a simplified Gesamtverstellmechanismus of rods and push rods or actuators over which all blades are adjusted by a single Verstelloperation at the same time and by the same amount, or via passive adjustment mechanisms.

The above-mentioned simplified Verstellmimik, over which all blades are adjusted by a single Verstelloperation at the same time and by the same amount, is usually achieved by a centrally located mechanical mechanism, which is either on the rear side of the machine frame, such as centrally located, or in the hub is integrated and also centrally located.

Conclusion: If in current KWEA a blade adjustment is even possible, then this is always carried out as a municipal or blanket blade adjustment, or as a passive blade adjustment. An individual blade adjustment is basically not carried out at KWEA, which is a disadvantage. This is particularly disadvantageous in terms of cost-effectiveness of current small wind turbines.

According to the current state of the art (CFGREENENERGY, TECHINFO [2011]), this municipal or blanket adjustment of the leaves has hitherto been carried out, for example, by means of a centrally present blade pitch control mechanism.

This blade pitch mechanism acts in most embodiments via a horizontal strut in the middle of the rotating shaft of this KWEA. The blade adjustment mechanism is excited via an actuator if necessary, the blade adjustment. At this horizontal strut rod-shaped adjusting members are arranged in the region of the hub, which are connected in the leaf shaft area hinged to the leaf wings of the KWEA and are also hingedly connected to the strut. If the horizontal strut so axially moved in the middle of the rotating shaft, such as excited by the actuator pushed forward or pulled backwards, for example, inversion of Aktoransteuerung, the rod-shaped adjusting members in the hub, which are connected to the blade shafts, also moved, ie pushed forward or pulled backwards. Since these rod or tubular adjusting members are pivotally connected to the blade shafts, as a result of the transfer of the axial adjustment movement to the articulated adjoining members thus also the blade shafts are moved. The result is a relative adjustment of the Blattanstellwinkel in such a way that the adjustment act in the same amount and with the same direction or deflection on all leaves, which are each hinged by means of an adjustment with the central strut.

The said prior art operation also uses the design of a manufacturer for KWEA for water production ( EOLEWATER [2011] ).

An individual blade adjustment in the form that each sheet is actively adjusted by a separate actuator and independent of the respective adjustment of the other existing leaves, but this is not possible in each case.

Problem solving and invention features:

In KWEA too, individual adjustment or single-blade adjustment would be of major advantage in terms of higher energy yield. Considering these current drawbacks, the problem arises of designing a device or system for small wind turbines that enables active individual adjustment of a blade of a small wind turbine, in particular for blades of wind turbines with a total output of less than 250 or 200 kW. By active and individual adjustment is meant that each blade can be actively adjusted by a separate mechanism and independently of the respective adjustment of the other existing leaves. This device or the assembly according to the invention should be robust and represent itself as a compact unit which builds flat, so does not require much space, and can be coupled between the hub and blade (shaft).

The solution succeeds ideally when a device according to the present invention is used, which realizes the aforementioned problem solution and solves the disadvantages of currently known systems. Features and characteristics are described in the description and in the claims. A preferably exemplary embodiment is shown in the following drawings. The basic feature is that this invention is carried out as a compact and self-sufficient unit, which is not connected to the Verwirkmechanismen the respective other leaves kraftwirkgemäß. It is therefore exactly a device according to the invention or such a system for exactly one each to be adjusted sheet available.

This device according to the invention or the system according to the invention, referred to below as an assembly, is arranged directly in the vicinity of the sheet to be adjusted, without the assembly requiring much additional space. It cantilevered outward elements of this device according to the invention or the system or assembly are avoided, which could adversely affect the flow characteristics of the KWEA by the wind.

This device according to the invention or the assembly is robust and designed as a compact unit, in particular as a flat, cylindrical, and substantially housing-coated assembly. This compactness makes it easier to assemble and transport the assembly than conventional KWEA blade pitch systems.

The adjustment of a (each) sheet of a small wind turbine is therefore possible by an aggregate, designed as a hydraulic or electric drive with gear stage, which is firmly connected from the inside of the wind turbine hub to an assembly, for example, flanged, screwed or riveted or welded to this assembly. For service purposes, this later internal unit from the outside may be accessible from the outside, but for example only by prior measures, such as exposing an existing service flap or by pushing or unfolding an opening in the hub, ideally in the immediate vicinity of the respective Aggregates.

The assembly according to the invention itself includes two mutually rotatable roller bearing rings in the form of a rotary joint, in particular a (ball) rotary connection. This assembly is according to the invention as a new, additional intermediate element between the respective sheet, in particular the associated blade shaft, the KWEA and the hub of the KWEA to install or attachable / coupled. This assembly has a much smaller overall height than its total diameter.

The outermost diameter of the assembly according to the invention is in principle similar in size to the diameter of the sheet or blade shank to be adjusted by the assembly, so that the assembly fits in very favorably between the blade shank and the adjacent construction without steps or steps being formed. The outermost diameter of the assembly is approximately that of the blade shaft.

In general, the outermost height of the invention is at most a quarter of the outermost diameter. Even better would be an even lower height-to-diameter ratio, for example, if the overall height of the assembly according to the invention is up to one fifth of its diameter and thus at most one fifth of the blade shaft. The drive train or the unit and, if necessary, connected units are not part of the assembly according to the invention. Refer to the above dimensions in terms of height-to-diameter ratio Therefore, drive train or the unit expressly not included.

According to the teaching of the invention, one of the two rings of this rotary joint is toothed along its circumference, so that the force can be transmitted from an element to the element to be adjusted. This one of the two rings may be the inner circumference of the smaller, inner, rolling bearing ring - one then speaks of an internal toothing of the inner ring - or the outer circumference of the larger, outer, rolling bearing ring - one then speaks of an external toothing of the outer ring -.

The rotary joint can be designed as a (ball) rotary connection known from the prior art, in particular as a four-point bearing known from the prior art.

In a further embodiment of the invention, any other compact bearing designs, such as a compact cylindrical roller bearing, a compact tapered roller bearing, a combined ball and roller bearings, or corresponding combinations thereof, are possible and conceivable. In particular, in other embodiments of the invention, multi-row rotary joints executed, therefore, multi-row ball bearings, multi-row tapered roller bearings, multi-row cylindrical roller bearings, or multi-row combined ball and roller bearings, or corresponding combinations thereof, which use balls and cylinders / rollers as bearings, make sense possible and conceivable , The size and design of the Drehvervbindung depends in principle on the moments and loads to be transmitted. In the further course of the description, however, emphasis is given to the preferred embodiment with (ball) rotary connection.

The said toothing extends in each case at least over one of the four circular segments of the toothed circumference, but preferably over all four circular segments of the toothed circumference.

It is also provided according to the teaching of the invention that the positive and non-positive connection between the unit and said invention assembly takes place via a pinion. This pinion engages directly in the said teeth and drives them. The drive power stems from the demanded on demand unit, which transmits the drive power via the gear stage to the pinion, which - depending on the polarity control - rotates clockwise or counterclockwise, as long as the drive continues. The pinion transmits each rotational movement corresponding to the teeth and thus on the toothed ring of the (ball) rotary connection and rotated in this way, the two rolling bearing rings against each other. This twisting usually stops when the control stops. (In special forms of the activation system, however, deadtime elements or delay elements may be present.)

It is within the meaning of the teaching of the invention to emphasize that in each case one of the two rings of the (ball) rotary connection is firmly connected to the adjacent construction / connection construction. This is usually realized via a plurality of screw connections, which result in a concentric "circle of screws". At least necessary for the realization of this circle of screws are four concentric screws. The respective adjacent screws each have the same distance from each other.

In general, one of the two rings of the (ball) rotary connection is connected to the sheet, while the other of the two rings is connected to the hub of the wind turbine.

Incidentally, it would also be feasible according to the invention that the connection between one of the two rings and the construction / connecting construction, for example the blade or the blade shank, provides at least one intermediate disc or other intermediate elements. This at least intermediate disc can, for example, also form a type of housing for the (ball) rotary connection fastened thereto, so that the assembly according to the invention can, in principle, already be delivered ready for assembly as a compact unit. However, it is important to keep in mind that the constructive connection between the above-mentioned unit and the module may under no circumstances be interrupted by one or more washer or other intermediate elements. The engagement of the pinion in the teeth of the assembly is thus always maintained under all circumstances. To understand the housing is to emphasize that on both sides of the (ball) rotary connection at least one washer or other intermediate elements can be attached.

At most, the overall height of the assembly according to the invention, including any intermediate washers, this is again emphasized, a quarter of its own outer diameter and is thus kept flat and compact.

In a preferred embodiment of the invention, the inner ring of the rotary joint with the blade (shaft) is fixed, while the outer ring of the rotary joint is fixed to the hub of the small wind turbine. The rotary joint is designed as a single-row ball slewing connection. The raceways can be hardened or hard turned. The osculation of the four-point bearing can for example be about 94%, but also slightly more or less.

For the purposes of the invention sealing arrangements are used to protect the (ball) rotary connection against external penetration of foreign bodies and dust or dirt and other external influences, and to prevent the leakage of the lubricant of the (ball) rotary connection, above all. Lubricants in this sense may be greases or other viscous lubricating media, but also such oil, which can be held by the seal assemblies in the interior of the rotary joint. According to the invention, at least one circumferential sealing arrangement per side is provided in order to seal the gap between the two rolling bearing rings. However, it is conceivable to use a plurality of circumferential sealing arrangements per side in the sense of a better sealing effect, if necessary also posture-reinforced sealing devices, such as sealing devices with inserted steel or drawstrings to increase the contact pressure of the seal to the sealed arrangement. Conventional sealing materials may be rubbery materials, such as Viton, NBR, ECO. The contact surfaces of the seal can be hardened or hard turned.

When the toothing can be mentioned that this heat treated (tempered, hardened) can be performed, executed in the preferred case tooth flanks hardened.

In order to keep the lubricant close to the components to be lubricated, it may be advisable to use an internal jacket which consists of a reinforced steel or plastic wall which is half-moon or three-quarter moon shaped. The inside of this wall is not usually in connection with lubricant or oil, while the outside of this wall of the toothing or the pinion is facing. This jacket has a diameter which is smaller than the diameter of the inner ring, in the case of an internally toothed assembly, in particular smaller than the diameter of the internal toothing. The jacket can be fixed by means of conventional screws on one of said intermediate disc. As a result, the jacket is held in position.

Looking back on the unit is to emphasize that according to the invention that unit can be attached to an intermediate disc. Then, however, an opening is necessary, so that the engaging in the toothing pinion can remain connected to the transmission of the unit, as emphasized above.

The two rolling bearing rings may, for example, but not necessarily, have integrated lubrication holes. Likewise, grease nipples are usually available. Any existing hardness slack is usually in the area of the rolling element inlet plug.

It is within the meaning of the invention to emphasize that the rolling elements of the (ball) rotary connection can also be cage-guided, but need not be caged. The use of spacers between the rolling elements is provided in a further embodiment. For example, it is also possible to use spacers with magnetized intermediate bodies.

Particularly advantageous in terms of weather resistance and long-term stability of the device, it may be when the rings of the (ball) rotary connection are coated, for example, about oxidized or iron-zinc coated. One or both rings can be chromated. In an advantageous embodiment of the invention, the inner ring is oxidized with an oxide layer thickness of less than 7 microns. In an advantageous embodiment of the invention, the outer ring is iron-zinc-coated, for example with a layer thickness of about 7 microns. The rolling bearing rings of the rotary joint can be made of conventional bearing steels, for example about 42CrMo4.

In the most advantageous embodiment, the assembly, designed for medium power class wind turbines of about 30 kW to 70 kW, which includes the (ball) rotary connection, has the following dimensions:
Diameter of the inner ring in the area of the mounting holes about 40 cm; Diameter of the outer ring in the region of the mounting holes about 52 cm; Outer diameter D of the assembly about 55 cm; Diameter of the internal toothing about 35 cm; Height of Wälzkörperringe about 8 cm; Height of the teeth about 5 cm; Total height H by 10 cm.

Also very suitable are assemblies for CHP in a higher performance class of about 100 to 250 kW, with for example the following dimensions:
Outer diameter D of the assembly about up to 100 cm; Diameter of internal teeth about up to 85 cm; Height of Wälzkörperringe about up to 15 cm; Height of the teeth about up to 11 cm; Total height H up to 20 cm. Also very well used are assemblies for KWEA in lower performance classes with correspondingly smaller sizes.

Further features, characteristics, advantages and effects on the basis of the invention will become apparent from the following descriptions of a preferred embodiment of the invention, as well as further advantageous embodiments of the invention, and with reference to the drawings. These figures are described as follows:

1a such as 1b show by way of example schematically the total system according to the invention as a small wind energy plant (KWEA) ( 50 ) with a total power of less than 250 to 200 kW.

1c shows by way of example schematically the front view according to the invention of the hub of the KWEA.

2 shows by way of example schematically the perspective view of an exemplary unit.

3 shows, by way of example, schematically the perspective illustration according to the invention of the subassembly substantially enclosed by the housing.

4a shows an example of a schematic perspective view of the assembly according to the invention, cut vertically.

4b shows an example schematically the perspective view of the adjustment mechanism according to the invention, cut horizontally.

4c shows an example schematically the perspective view of the assembly according to the invention, cut vertically and enlarged.

LIST OF REFERENCE NUMBERS

1

Inventive device or assembly

2

Adjustment mechanism of the device or assembly

3

Aggregate, if necessary with gear stage

4

pinion

5

gearing

6

First, inner, bearing ring

7

Second, outer, rolling bearing ring

8th

rolling elements

9

Washer; also as a housing washer

10

Washer; also as a housing washer

11

Circumferential seal arrangement

12

Circumferential seal arrangement for sealing the rotary joint

13

Rolling bearing cage or spacers

14

rolling body

15

opening

16

coat

17

Mounting holes for connection of unit and assembly

18

Holes for fixing screws on the first rolling bearing ring

19

Holes for fastening screws on second rolling bearing ring

20

Circumferential seal arrangement for sealing the rotary joint

21

Circumferential sealing device

H

Extreme height

D

Extreme diameter

K

Inlet plug for rolling elements

50

Small wind turbine (KWEA)

51

Mast or uprising structure

52

Gondola or a machine carrier with generator

53

hub

54

leaf

55

blade shank

56

Sensors / instruments for wind / flow determination

57

Actuator for adjustment / rotation of the system (in azimuth)

1a , as well as 1b shows by way of example schematically the total system according to the invention as a small wind energy plant (KWEA) ( 50 ) with a total power of less than 250 kW, in particular even less than 200 kW. The KWEA ( 50 ) is based on the modern standard design with several sheets ( 54 ), which in each case indirectly with the hub ( 53 ), by means of one assembly each ( 1 ), the active adjustment of the respective sheet ( 54 ) or leaf stem ( 55 ). This modern standard design depicts one and horizontal axis of the KWEA, as well as a mast ( 51 ) or elevation structure ( 51 ) or tower ( 51 ), which is based for example on a foundation, (but could in principle also be fixed in or on another building or building part). In most cases, the corresponding wind sensors ( 56 ) in order to identify in which direction the plant ( 50 ) in the horizontal plane in order to gain maximum yield. This azimuthal pivoting movement is controlled by a corresponding, between mast ( 51 ) and gondola ( 52 ) or machine carrier ( 52 ) Actuator realized. This actor ( 57 ) can be designed as a pivot drive, for example, as a rotary actuator, which has in its interior two mutually rotatable bearing rings whose rotation by another drive, the tower or azimuth drive ( 57 ) can be obtained.

1c shows by way of example schematically the front view according to the invention of the hub of the KWEA ( 50 ), wherein the hub is shown cut. The assembly ( 1 ), which is essentially enclosed housing, is in each case between sheet ( 54 ) or leaf stem ( 55 ), and essentially has the diameter, too the respective connection construction ( 53 ) or sheet ( 54 ) or leaf stem ( 55 ) has the purpose of ensuring that the assembly is as identical in shape as possible ( 50 ). This measure reduces "step formation" and also optimizes the Windanströmverhältnisse and the optical effect. It should be emphasized that the respective aggregates ( 3 ) or the respective drive train which is connected to the module ( 1 ) can be coupled or connected, not from the housing of the module ( 1 ) but inside the hub ( 53 ) or inside the structure of the adjacent construction ( 53 ) is positioned without taking a lot of volume. In the exemplary embodiment according to 1c is a three-bladed KWEA shown with horizontal axis. The aggregate ( 3 ) is always always in principle with the pinion ( 4 ) in the direction of the assembly ( 1 ), since the pinion in the toothing ( 5 ) engages the assembly when the adjustment movement of the sheet ( 54 ) is required. The 2 shows by way of example schematically the perspective view of such an exemplary aggregate ( 3 ), from which the pinion ( 4 ) stands out.

3 such as 4a such as 4b such as 4c show, by way of example and diagrammatically, the perspective illustration according to the invention of the subassembly substantially enclosed by the housing ( 1 ). In the former view, the housing is visible from the outside, indicated in each case the hub side ( 53 ) and the leaf side ( 54 ), the positioning of the assembly ( 1 ) to explain. The aggregate ( 3 ) including the pinion ( 4 ) in the installed state either by means of screws in corresponding holes ( 17 ) with the assembly ( 1 ) or on the intermediate or housing disc ( 9 ) attached. For example, the pinion ( 4 ) through an opening ( 15 ) to the gearing ( 5 ) are adapted or created to get there the necessary for a rotation of Wälzkörperringes conclusion.

4a such as 4b such as 4c each show sectional views of the assembly, each without aggregate as in 3 , It is shown that any outwardly projecting elements are avoided because all the essential parts of the adjustment mechanism of the device or assembly ( 2 ) inside this assembly ( 1 ) are arranged.

The assembly ( 1 ) is designed as a compact unit with the unit ( 3 ), the aggregate ( 3 ) from the inside (hub side) of the wind turbine hub to the assembly ( 1 ), for example flanged, screwed or riveted or can be welded to this module. For service purposes, service flaps can each be located in the immediate vicinity of the respective unit ( 3 ) are installed. These service agents are in the hub or the adjacent construction ( 53 ) to be found. The outermost diameter (D) of the assembly according to the invention ( 1 ) is in principle similar in size to the diameter of the sheet to be adjusted by the assembly ( 54 ) or leaf stem ( 55 ). The ratio (H) / (D) is less than one-fifth in the present example. 4a such as 4b such as 4c show each as well the mutually rotatable rolling bearing rings ( 6 ) ( 7 ) in the form of a rotary joint, preferably a ball slewing connection, here designed as a four-point bearing. The said gearing ( 5 ) is in the inner ring ( 6 ) and extends over all four circle segments of the toothed circumference. The pinion ( 4 ) engages directly into said gearing and drives it as soon as the pinion is driven. It is possible - depending on the control - to drive the toothing clockwise or counterclockwise, and thus the inner ring ( 6 ) either in one or the other direction with respect to the outer ring ( 7 ) to twist. One of the two rings ( 6 ) ( 7 ) is with the adjacent construction, either with the sheet ( 54 ) or the blade shaft ( 54 ) - or with the adjacent construction or the hub ( 53 ) connected. This is usually realized via a plurality of screw connections, which in a concentric "screw circle" or "screw ring" ( 18 ) ( 19 ) result. At least necessary for the realization of this circle of screws are four concentric screws, evenly distributed over the screw ring. In the present example, the outer ring ( 7 ) with the hub ( 53 ) or the adjacent construction ( 53 ) by screwing the screw circle ( 19 ), here even with the washer ( 9 ) as an intermediate element. In the present example, the inner ring ( 6 ) with the sheet ( 54 ) or with the blade shaft ( 55 ) by screwing the screw circle ( 18 ). The use of one or more washers ( 9 ) ( 10 ) is not obligatory for the adjustment function of the invention ( 1 ). It could be the connection between one of the two rings ( 6 ) ( 7 ) and the construction / connection construction or the sheet, for example by screwing, without the intermediate disc ( 9 ) is available. However, it is important to keep in mind that one or more existing washers ( 9 ) ( 10 ) the constructive connection between the above-mentioned unit and the assembly may under no circumstances be interrupted. The engagement of the pinion ( 4 ) into the gearing ( 5 ) of the assembly ( 1 ) is always respected under all circumstances. The raceways can be hardened or hard turned. The osculation of the four-point bearing can be, for example, about 94%. For the purposes of the invention, sealing arrangements ( 11 ) ( 12 ) ( 20 ) ( 21 ) used, especially the Ball slewing ring to protect against external intrusion of foreign bodies and dust or dirt and other external influences. The gearing ( 5 ) can be heat treated (tempered, hardened) and is also tooth flank hardened in the example presented. In order to keep the lubricant close to the components to be lubricated, an inner shell ( 16 ), which consists of a reinforced steel or plastic wall, which is designed crescent-shaped or three-quarter moon-shaped. The jacket can be replaced by conventional screws ( 17 ) on one of said intermediate disk ( 9 ) are attached. As a result, the jacket is held in position. The two rolling bearing rings may, for example, but not necessarily, have integrated lubrication holes. Likewise, grease nipples are usually available. Any existing hardness slack is usually in the area of the inlet plug (K) for rolling elements. It is to be emphasized in the sense of the invention that the rolling elements of the ball slewing connection can also be cage-guided, but need not be cage-guided. Also the use of spacers ( 13 ) between the rolling elements ( 8th ) is shown in the example. For example, spacers ( 13 ) or cage parts ( 13 ) are used with magnetized intermediate bodies. In the present example, the rings of the ball slewing compound are coated, such as oxidized or iron-zinc coated. The inner ring is exposed to an oxide layer. The outer ring is iron-zinc coated, the rolling bearing rings of the rotary joint are made of 42CrMo4.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10252759 [0005]
• DE 102009015669 [0005]
• DE 202007011577 U1 [0021]
• DE 102008009740 [0021]
• DE 102004046260 [0023]
• DE 10140793 [0023]
• DE 10146968 [0023]
• DE 19644705 [0023]
• DE 4221783 [0023]
• DE 10044262 [0023]
• DE 102006023411 [0023]
• DE 19626402 [0023]
• DE 3544814 [0025]
• EP 0226052 [0025]

Cited non-patent literature

• Standard EN 61400-2 [0006]
• Bundesverband Kleinwindanlagen [2010] [0007]
• EN 61400-2 [0007]
• EN 61400-2 [0007]
• Schwieger, Hahn, BVKW [2011] [0008]
• Standard EN 61400-2 [0008]
• Hughes, Leovac, Mayr, et. al [2008] [0010]
• IEC standard 61400-2 [0010]
• ETAPLAN, Hau [2003] [0018]
• Adelhardt [2011] [0018]
• Simon, Riederer, Meurer [2010], page 20 [0019]
• ETAPLAN, Hau [2003] [0022]
• ETAPLAN, Hau [2003], page 353, cf. Figure 9.33 [0025]
• EOLEWATER [2011] [0031]

Claims (29)

Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a (small) wind energy plant ( 50 ), expediently for wind turbines ( 50 ) with a total power of less than 250 kW, in particular even less than 200 kW, characterized in that each device or assembly ( 1 ) as, for example, as a compact substantially protected by housing assembly ( 1 ) is designed, in particular by a circular or cylindrical housing with optionally existing openings protected assembly ( 1 ) which is the active adjustment of a sheet ( 54 ), whereby each sheet ( 54 ) by an adjustment mechanism ( 2 ) active in the interior of the module and regardless of the respective adjustment of any other leaves ( 54 ) can be adjusted. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a (small) wind energy plant ( 50 ), expediently for wind turbines ( 50 ) with a total power of less than 250 kW, in particular even less than 200 kW, characterized in that, inside this device or assembly ( 1 ) and mounted between at least one upper housing or intermediate disc ( 9 ) and at least one lower housing or intermediate disc ( 10 ) the adjustment mechanism ( 2 ) is mounted, which consists essentially of two mutually rotatable rolling bearing rings ( 6 ) ( 7 ) which on rolling elements ( 8th ), wherein at least one of these rings a toothing ( 5 ), for example, which by a pinion ( 4 ), whereby this toothing ( 5 ) is designed either as a circumferential annular toothing or as a partially rotating segment-like toothing, wherein preferably either the inner circumference of the smaller inner rolling bearing ring ( 6 ) is toothed, or the outer circumference of the larger outer rolling bearing ring ( 7 ) is toothed. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a small wind turbine ( 50 ) according to claim 1 or claim 2 characterized in that, the active adjustment of a sheet ( 54 ) regardless of the adjustment of the connected sheet ( 54 ) regardless of any further sheets ( 54 ) is also possible if existing housing or intermediate washers ( 9 ) ( 10 ) omitted, or alternatively only partially available. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a small wind turbine ( 50 ) according to one of the preceding claims, characterized in that the device or assembly ( 1 ) has a smooth, preferably rounded outer contour, which is free of outwardly projecting elements, in particular free of such elements is the inflow characteristic of a KWEA ( 50 ) are adversely affected by the wind, with a negative influence in particular an increase in the turbulence of the flow in the immediate area of the assembly ( 1 ) means. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a small wind turbine ( 50 ) according to one of the preceding claims characterized in that, device or assembly ( 1 ) has a cylindrical outer contour with a diameter (D) and a flat overall height (H), preferably has a substantially lower outer or total height (H), as its outermost diameter (D), preferably the outermost height (H) this assembly is equal to or less than 20 cm, in particular less than 10 cm. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a small wind turbine ( 50 ) according to one of the preceding claims, characterized in that, this assembly ( 1 ) may be connected to an aggregate ( 3 ), which is designed for example as a hydraulic or electric drive with gear stage, which from the inside of the wind turbine hub ( 53 ) to the assembly ( 1 ) is coupled or can be coupled, in particular to this module ( 1 ) is flanged, screwed or riveted or welded, and by the enclosure of the wind turbine hub ( 53 ) is separated from the outside, but preferably by at least one closable service opening from the outside for maintenance and service purposes is reached. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a small wind turbine ( 50 ) according to one of the preceding claims, characterized in that, this assembly ( 1 ) two mutually rotatable rolling bearing rings ( 6 ) ( 7 ) in the form of a rotary joint, for example a rotary joint which cages or spacers ( 13 ) and rolling elements ( 8th ), preferably also designed as a four-point bearing, in particular as a four-point bearing with an osculation of about 94%. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a small wind turbine ( 50 ) according to one of the preceding claims, characterized in that, this assembly ( 1 ) either indirectly, such as transmitting annular or circular intermediate elements, in particular, however, which have no share in the actual displacement movement of the sheet, but preferably directly between the respective sheet ( 54 ), preferably the leaf stem ( 55 ), a KWEA, and the hub ( 53 ) of a KWEA ( 50 ) is coupled or can be coupled. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a small wind turbine ( 50 ) according to one of the preceding claims, characterized in that the outermost diameter (D) of the assembly ( 1 ) similar to the diameter of the blade shank to be adjusted by the assembly ( 55 ) or the sheet to be adjusted ( 54 ) and the same size as the connection diameter at the adjacent construction or the wind turbine hub ( 53 ), in particular so that the assembly ( 1 ) between the sheet ( 54 ) or the blade shaft ( 55 ) and the adjacent construction or the wind turbine hub ( 53 ), without causing in the region of this coupling diameter differences, for example in the form of step formation. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a small wind turbine ( 50 ) according to one of the preceding claims characterized in that, a positive and non-positive connection between the unit ( 3 ) and the adjustment mechanism ( 2 ) in said assembly ( 1 ) via a pinion ( 4 ), wherein the pinion ( 4 ) directly into the existing gearing ( 5 ) intervenes. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a small wind turbine ( 50 ) according to one of the preceding claims, characterized in that the pinion ( 4 ) every activation of the aggregate ( 3 ) in a rotational movement and corresponding to the toothing ( 5 ) and thus on the toothed ring ( 6 ) ( 7 ) transmits the rotary joint and in this way the two rolling bearing rings ( 6 ) ( 7 ) Turned against each other, this twisting usually ends then when the control stops. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a small wind turbine ( 50 ) according to one of the preceding claims, characterized in that the substantially housing-encased assembly ( 1 ) one or more intermediate discs ( 9 ) or other intermediate elements ( 10 ), on which the aggregate ( 3 ) is coupled or is coupled, whereby existing washers ( 9 ) ( 10 ) the positive and non-positive connection between the unit ( 3 ) and said assembly ( 1 ) is interrupted, but in particular by at least one existing opening ( 15 ) continues to be ensured. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a small wind turbine ( 50 ) according to one of the preceding claims, characterized in that, the rotary joint against external penetration of foreign bodies and dust or dirt and other external influences by circulating at least one circumferential sealing arrangement ( 12 ) ( 20 ) is protected, as well as the gearing so by at least one circumferential sealing arrangement ( 11 ) ( 21 ) is protected. Contraption ( 1 ) for actively adjusting a sheet ( 54 ) of a small wind turbine ( 50 ) according to one of the preceding claims, characterized in that, inside the assembly ( 1 ) a coat ( 16 ) is mounted or inserted, which consists of a reinforced steel or plastic wall, for example, the crescent-shaped or three-quarter moon-shaped. Small wind turbine (KWEA) ( 50 ) with a total power of less than 250 kW, in particular even less than 200 kW, at least including: - a mast or an uprising structure ( 51 ), - as well as a nacelle or a machine carrier with generator ( 52 ), - and a hub ( 52 ), - as well as several leaves ( 54 ) each with its shaft ( 55 ) to the hub ( 52 ), as well as sensors / instruments for wind / flow determination ( 56 ) - and at least one actor ( 57 ) for adjustment / rotation of the system (in azimuth) characterized in that, each sheet by a separate assembly ( 1 ), for example, a compact assembly which is substantially protected by housing, preferably by a circular or cylindrical housing with possibly existing openings, including an adjustment mechanism ( 2 ) in the interior of itself, active and independent of the respective adjustment of the other existing leaves ( 54 ), each of which has a separate assembly ( 1 ) between hub ( 53 ) and leaf stem ( 55 ) or sheet ( 54 ) is arranged. Small wind turbine (KWEA) ( 50 ) according to claim 15, characterized in that each device or assembly ( 1 ) as, for example, as a compact substantially protected by housing assembly ( 1 ) is designed, in particular by a circular or cylindrical housing with optionally existing openings protected assembly ( 1 ) which is the active adjustment of a sheet ( 54 ), whereby each sheet ( 54 ) by an adjustment mechanism ( 2 ) active in the interior of the module and regardless of the respective adjustment of any other leaves ( 54 ) can be adjusted. Small wind turbine (KWEA) ( 50 ) according to claim 15 characterized in that, in Interior of this device or assembly ( 1 ) and mounted between at least one upper housing or intermediate disc ( 9 ) and at least one lower housing or intermediate disc ( 10 ) the adjustment mechanism ( 2 ) is mounted, which consists essentially of two mutually rotatable rolling bearing rings ( 6 ) ( 7 ) which on rolling elements ( 8th ), wherein at least one of these rings a toothing ( 5 ), for example, which by a pinion ( 4 ), whereby this toothing ( 5 ) is designed either as a circumferential annular toothing or as a partially rotating segment-like toothing, wherein preferably either the inner circumference of the smaller inner rolling bearing ring ( 6 ) is toothed, or the outer circumference of the larger outer rolling bearing ring ( 7 ) is toothed. Small wind turbine (KWEA) ( 50 ) according to claim 15, characterized in that, the active adjustment of a sheet ( 54 ) regardless of the adjustment of the connected sheet ( 54 ) regardless of any further sheets ( 54 ) is also possible if existing housing or intermediate washers ( 9 ) ( 10 ) omitted, or alternatively only partially available. Small wind turbine (KWEA) ( 50 ) according to claim 15, characterized in that the device or assembly ( 1 ) has a smooth, preferably rounded outer contour, which is free of outwardly projecting elements, in particular free of such elements is the inflow characteristic of a KWEA ( 50 ) are adversely affected by the wind, with a negative influence in particular an increase in the turbulence of the flow in the immediate area of the assembly ( 1 ) means. Small wind turbine (KWEA) ( 50 ) according to claim 15 characterized in that, device or assembly ( 1 ) has a cylindrical outer contour with a diameter (D) and a flat overall height (H), preferably has a substantially lower outer or total height (H), as its outermost diameter (D), preferably the outermost height (H) this assembly is equal to or less than 20 cm, in particular less than 10 cm. Small wind turbine (KWEA) ( 50 ) according to claim 15, characterized in that, this assembly ( 1 ) may be connected to an aggregate ( 3 ), which is designed for example as a hydraulic or electric drive with gear stage, which from the inside of the wind turbine hub ( 53 ) to the assembly ( 1 ) is coupled or can be coupled, in particular to this module ( 1 ) is flanged, screwed or riveted or welded, and by the enclosure of the wind turbine hub ( 53 ) is separated from the outside, but preferably by at least one closable service opening from the outside for maintenance and service purposes is reached. Small wind turbine (KWEA) ( 50 ) according to claim 15, characterized in that, this assembly ( 1 ) two mutually rotatable rolling bearing rings ( 6 ) ( 7 ) in the form of a rotary joint, for example a rotary joint which cages or spacers ( 13 ) and rolling elements ( 8th ), preferably also designed as a four-point bearing, in particular as a four-point bearing with an osculation of about 94%. Small wind turbine (KWEA) ( 50 ) according to claim 15, characterized in that, this assembly ( 1 ) either indirectly, for example via supporting annular or circular intermediate elements, but in particular which have no share in the actual displacement movement of the sheet, but preferably directly between the respective sheet ( 54 ), preferably the leaf stem ( 55 ), a KWEA, and the hub ( 53 ) of a KWEA ( 50 ) is coupled or can be coupled. Small wind turbine (KWEA) ( 50 ) according to claim 15, characterized in that the outermost diameter (D) of the assembly ( 1 ) similar to the diameter of the blade shank to be adjusted by the assembly ( 55 ) or the sheet to be adjusted ( 54 ) and the same size as the connection diameter at the adjacent construction or the wind turbine hub ( 53 ), in particular so that the assembly ( 1 ) between the sheet ( 54 ) or the blade shaft ( 55 ) and the adjacent construction or the wind turbine hub ( 53 ), without causing in the region of this coupling diameter differences, for example in the form of step formation. Small wind turbine (KWEA) ( 50 ) according to claim 15 characterized in that, a positive and non-positive connection between the unit ( 3 ) and the adjustment mechanism ( 2 ) in said assembly ( 1 ) via a pinion ( 4 ), wherein the pinion ( 4 ) directly into the existing gearing ( 5 ) intervenes. Small wind turbine (KWEA) ( 50 ) according to claim 15, characterized in that the pinion ( 4 ) every activation of the aggregate ( 3 ) in a rotational movement and corresponding to the toothing ( 5 ) and thus on the toothed ring ( 6 ) ( 7 ) transmits the rotary joint and in this way the two rolling bearing rings ( 6 ) ( 7 ) Turned against each other, this twisting usually ends then when the control stops. Small wind turbine (KWEA) ( 50 ) according to claim 15, characterized in that the substantially housing-encased assembly ( 1 ) one or more intermediate discs ( 9 ) or other intermediate elements ( 10 ), on which the aggregate ( 3 ) is coupled or is coupled, whereby existing washers ( 9 ) ( 10 ) the positive and non-positive connection between the unit ( 3 ) and said assembly ( 1 ) is interrupted, but in particular by at least one existing opening ( 15 ) continues to be ensured. Small wind turbine (KWEA) ( 50 ) according to claim 15 characterized in that, the rotary joint against external penetration of foreign bodies and dust or dirt and other external influences by circulating at least one circumferential sealing arrangement ( 12 ) ( 20 ) is protected, as well as the gearing so by at least one circumferential sealing arrangement ( 11 ) ( 21 ) is protected. Small wind turbine (KWEA) ( 50 ) according to claim 15, characterized in that, inside the assembly ( 1 ) a coat ( 16 ) is mounted or inserted, which consists of a reinforced steel or plastic wall, for example, the crescent-shaped or three-quarter moon-shaped

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