Bearing receptacle for a plain bearing for a rotor shaft of a wind turbine

Abstract

The invention relates to a bearing receptacle (1) for a plain bearing (2) for a rotor shaft (3) of a wind turbine (4), having at least the following components: - a positioning device (5) for positioning a bearing element (6), wherein the bearing element (6) has a defined bearing axis (7); - a guide rail (8) for guiding the positioning device (5) along a positioning axis (9); and - a fixing device (10) for fixing the positioning device (5) in a position set during assembly. The bearing receptacle (1) is primarily characterised in that the positioning axis (9) is oriented at an angle to the bearing axis (7) of the bearing element (6) to be positioned. A setting of a bearing gap is permanently ensured by means of the bearing receptacle proposed here.

Description

[0001] Bearing holder for a plain bearing for a rotor shaft of a wind energy plant

[0002] The invention relates to a bearing holder for a plain bearing for a rotor shaft of a wind turbine, a plain bearing with such a bearing holder for a rotor shaft of a wind turbine, a rotor with such a plain bearing for a wind turbine, and a wind turbine with such a rotor.

[0003] In the course of the energy transition and the decarbonization of the energy infrastructure, wind turbines are becoming increasingly important. With capacities of up to 7 MW [seven megawatts] on land (onshore) and up to an output of over 15 MW [fifteen megawatts] offshore per wind turbine, wind turbines will represent the so-called base load of energy consumption in the future. The wind turbine, using the prevailing wind, uses rotor blades and a connected rotor shaft (together known as the rotor) to drive a generator, which is designed to generate electrical power from the torque provided. Future (offshore) wind turbines are even expected to achieve capacities of 20 MW or more, which will be reflected in an increase in the size of the rotor blades and generator, as well as the rotor shaft.

[0004] In conventional wind turbines, the rotor shaft is supported both radially and axially. As the power of wind turbines increases, the rotor shaft bearings must also meet increased requirements. In addition to the rotor shaft to be supported and the resulting increased weight on the bearings, the increased torque on the bearings is a factor to be considered in the design of the wind turbine. Conventional bearings in wind turbines are usually very difficult to install or replace on-site. In addition, after replacing the bearings, for example during maintenance, the exact radial and / or axial position of the rotor shaft must be adjusted, as otherwise this could lead to imbalance and thus damage to the generator. Based on this, the present invention is based on the object of at least partially overcoming the disadvantages known from the prior art.The features of the invention are set forth in the independent claims, for which advantageous embodiments are presented in the dependent claims. The features of the claims can be combined in any technically reasonable manner, whereby the explanations in the following description and features from the figures, which comprise supplementary embodiments of the invention, can also be considered.

[0005] The invention relates to a bearing support for a plain bearing for a rotor shaft of a wind turbine, comprising at least the following components:

[0006] - a positioning device for positioning a bearing element, wherein the bearing element has a defined bearing axis;

[0007] - a guide rail for guiding the positioning device along a positioning axis; and

[0008] - a fixing device for fixing the positioning device in a position set during assembly.

[0009] The bearing holder is characterized primarily by the fact that the positioning axis is inclined to the bearing axis of the bearing element to be positioned.

[0010] In the following, reference is made to the rotor axis mentioned when, without explicit indication to the contrary, the axial direction, radial direction, or rotational direction and corresponding terms are used. Ordinal numbers used in the preceding and following descriptions serve only to clearly distinguish them and do not reflect the order or ranking of the designated components. An ordinal number greater than one does not necessarily imply that another such component must be present.

[0011] A bearing support for a plain bearing is proposed here. The bearing support is designed, for example, for a wind turbine, for example, for placement within a nacelle. Alternatively, the bearing support is designed for other systems, particularly large-scale systems. A bearing (e.g., a plain bearing) held by the bearing support is designed to support a rotor shaft (e.g., of a wind turbine).

[0012] Here, it is proposed that the bearing mount comprise a positioning device configured to position a bearing element. The bearing element in question can thus be adjusted axially (e.g., for an axial bearing) and / or radially (e.g., for a radial bearing) relative to the rotor axis via this positioning device. In the case of a plain bearing, for example, the desired bearing gap can be adjusted. The bearing element is designed as a component of a plain bearing, ensuring low-friction rotation with the aid of an oil film between the rotor shaft and the bearing mount. In one embodiment, the plain bearing is configured for hydrostatic bearing support, and in another, for hydrodynamic bearing support.Such a bearing element, when designed in segments, is also referred to as a plain bearing segment or bearing pad, with a plurality of such bearing pads being distributed (evenly or load-dependently) around the circumference of a rotor shaft. It should be noted that in one embodiment, such bearing pads are mounted on the rotor shaft so that it rotates with it, or conversely, are fixedly mounted in the bearing mount. A corresponding counter-bearing surface is then formed by the bearing mount or by the rotor shaft. The counter-bearing surface can also be provided in segmented form before assembly, but after assembly, it can be a fully circumferential surface for rotational operation.

[0013] The bearing element has a defined bearing axis. The bearing axis is an axis along which the bearing forces run. In a (pure) axial bearing, the bearing axis is aligned axially, i.e. parallel to the rotor axis. In a (pure) radial bearing, the bearing axis is aligned radially to the rotor axis. In a plain bearing, the bearing axis is aligned perpendicular to the sliding surface. In an angular contact bearing embodiment, i.e. with both axial and radial force components, the bearing axis is aligned at an angle to the rotor axis. With equal components, the angle is 45°. It should be noted that there are many different ways in which a bearing element can be designed, and for the sake of clarity, only the simplest and most common forms are mentioned here. Furthermore, a guide rail for guiding the positioning device is proposed.To ensure the precise position of the bearing element and thus also of the rotor shaft during assembly, the guide rail is designed to align the positioning device along a positioning axis. The guide rail is designed like a gauge and is connected, for example, to the bearing mount, preferably in one piece. After assembly, i.e., during operation, the positioning device is aligned coaxially with the positioning axis.

[0014] If a position of the positioning device along the positioning axis is set during assembly, this position can be fixed by means of the fixing device. In one embodiment, the fixing device is designed as a threaded pair, in which the guide rail has a thread and the positioning device has a corresponding counter-thread. This is advantageous for small sizes and / or when the bearing element in question is positioned based on a preload force. For larger bearing elements, the positioning device is preferably designed using separate means, for example threaded rods and nuts, for attachment to or indirectly to the bearing mount. In an alternative embodiment, the fixing device is designed as a weld between (directly or indirectly) the bearing mount and the positioning device.

[0015] To achieve the adjustability of the bearing element described above, it can be aligned using the positioning device. In the case of an axial bearing, an axial bearing gap or an axial tolerance must be adjusted to compensate for this, or a preload force must be set, whereby only sufficient radial play must be maintained. The reverse applies to a radial bearing, with adjustment in the radial direction and play in the axial direction. This makes it possible to use a feed path for positioning that is inclined to the direction to be adjusted, for the sake of simplicity, for example, less than 45°. Reducing the adjustable path also reduces the play, but this means that the bearing force and the positioning axis are not aligned along the same axis. This achieves a combination of a positive force flow (due to the inclination) with axial or radial adjustability in one function.By aligning the force flow from the bearing element (along the bearing axis) and the positioning axis non-parallel to each other, a positive fit is created. This positive fit prevents creep over the intended service life of the system (e.g., in a screw connection), and the relative inclination of the positioning axis to the bearing axis also reduces the influence of such creep from the set position.

[0016] It should be noted that in the case of a radial bearing and an axial bearing, the positioning device is inclined to the rotor axis, but in the case of an angular contact bearing (for example for a clamped bearing in an O-arrangement or X-arrangement) it is aligned radially or axially (i.e. parallel) to the rotor axis due to the bearing axis being inclined to the rotor axis.

[0017] It is further proposed in an advantageous embodiment of the bearing receptacle that the guide rail is formed by a through-opening, wherein preferably a respective bearing element can be guided through the through-opening.

[0018] Here, it is proposed that the guide rail be designed as a through-hole. This allows for a precise position of the bearing element relative to the rotor shaft within the bearing mount, while reliably and robustly absorbing high alternating forces.

[0019] In a preferred embodiment, a respective bearing element or the through-hole is designed such that the bearing element can be guided through the through-hole. This also enables the removal and replacement or reinsertion of a bearing element during an inspection without having to dismantle the bearing support itself. Especially with wind turbines, the time windows for assembly work are often small because they are installed in windy areas or at high altitudes. Therefore, reducing assembly time is almost more important than the actual assembly effort.

[0020] In an advantageous embodiment of the bearing mount, it is further proposed that the bearing mount be a component of a bearing housing. According to one aspect, a bearing housing for a plain bearing for a rotor shaft of a wind turbine is proposed, comprising a bearing mount according to an embodiment as described above.

[0021] Here, a bearing housing is proposed that encompasses the bearing support. The bearing housing is designed to enclose the bearing support. For example, the bearing housing is constructed from one or more sheets, so that the bearing support is protected from external influences. In one embodiment, the bearing housing is designed as a wet space, so that the at least one bearing element can be wetted with a film of lubricating oil for operation (protected from environmental influences).

[0022] It is further proposed in an advantageous embodiment of the bearing receptacle that the positioning device comprises a stop surface, wherein the stop surface can be fixed to a fixed counter surface of the bearing receptacle at an adjustable distance, wherein preferably the distance between the stop surface and the corresponding counter surface can be adjusted by means of at least one shim.

[0023] A stop surface simplifies correct assembly by allowing a defined position to be adjusted via a positive fit. A positive fit is particularly advantageous for simple and secure assembly in bearings where the adjustment cannot be made using a preload force, but rather purely geometrically (as with a plain bearing). The stop surface is preferably arranged outside the bearing mount, particularly preferably outside the bearing housing, so that it is easily visible and can therefore be reliably and correctly adjusted. In one embodiment, the stop surface, together with the corresponding counter surface, has a sealing function (for example, by means of an O-ring).

[0024] The counter surface proposed here is arranged corresponding to the stop surface and is preferably a component of the bearing mount or the bearing housing. For example, the counter surface is a flange of the bearing mount or a milled surface. The stop surface can be fixed relative to the counter surface at an adjustable distance. In one embodiment, the stop surface is designed such that it is in direct contact with a corresponding counter surface when the predetermined distance or the position of the rotor shaft is established. It should be noted that in a preferred embodiment, both the stop surface is firmly fixed to the positioning device and the corresponding counter surface is firmly fixed to the bearing mount of the positioning device.

[0025] In a preferred embodiment, the distance is adjustable by means of at least one shim. A shim is, for example, a type of washer, a spring washer, or a shim. The at least one shim is arranged between the stop surface and the corresponding counter surface and, by means of its axial extension (relative to the positioning axis) or the sum of the extensions of several shims, adjusts the distance between the stop surface of the positioning device and the corresponding counter surface of the bearing mount in a form-fitting manner. Securing, for example by means of a frictional connection using a screw connection, then has no or only a negligible influence on the correct adjustment of the position of the positioning device and thus of the relevant bearing element.

[0026] In a further advantageous embodiment of the bearing mount, it is proposed that the bearing element to be positioned and the positioning device are formed as a single piece. Here, the bearing element and the positioning device are designed as a single component. For example, the two are formed as separate components or assemblies and are fixed to one another prior to assembly by means of a material connection. Thus, the bearing element to be positioned is arranged in the predetermined orientation by means of the positioning device, and thus the rotor shaft is held in the corresponding position.

[0027] In a preferred embodiment, the bearing element and the positioning device are formed as two separate components, so that one bearing element can be replaced or temporarily removed while the positioning device remains usable. For example, the bearing element and the positioning device are connected to one another to form a common assembly prior to assembly or (final) positioning. Furthermore, in an advantageous embodiment of the bearing mount, it is proposed that the bearing element to be positioned be part of a radial bearing.

[0028] The bearing element is designed, for example, as a bearing or bearing pad for a radial bearing. Preferably, a plurality of bearing elements are provided and thus also positioning devices, which are preferably each assigned to a single bearing segment (and thus preferably bearing element). For secure radial bearing, two or more radial bearings are usually provided distributed along the rotor shaft to be supported. For example, a shoulder is formed on the rotor shaft to be supported, on which a surface property and roundness suitable for optimal guidance of the rotation of the rotor shaft is set. Under certain circumstances, due to tolerances, the multiple bearing points must be coordinated with one another, and thus the bearing elements must be adjusted by the positioning device taking into account a different radial bearing in each case.The radial distance to the rotor shaft can be reliably adjusted by means of the positioning device proposed here and is held securely in the set position over a lifetime due to the positive locking.

[0029] It is further proposed in an advantageous embodiment of the bearing holder that the bearing element to be positioned is a component of an axial bearing.

[0030] The bearing element is designed, for example, as a bearing ring or bearing pad for an axial bearing. Preferably, a plurality of bearing elements are provided, and thus also positioning devices, which are preferably each assigned to a single bearing segment (and thus preferably bearing element). For secure axial support, two or more antagonistic axial bearings are usually provided, provided the rotating axis is not aligned parallel to the Earth's gravitational field. For example, a shoulder is formed on the rotor shaft to be supported, on which an axial bearing is provided on the left and right in the axial direction. The axial distance from one another and from the shoulder of the rotor shaft can be reliably adjusted using the positioning device.According to a further aspect, a plain bearing for a rotor shaft of a wind turbine is proposed, comprising a bearing housing for a plurality of bearing elements, wherein at least one of the bearing elements is accommodated in a bearing receptacle according to an embodiment according to the above description, wherein preferably the bearing elements are configured for hydrodynamic bearing.

[0031] Here, a plain bearing with a bearing housing is proposed, wherein the bearing housing is designed to house the plain bearing. The plain bearing is formed jointly by a plurality of (plain) bearing elements. The bearing housing is preferably designed to be closed, so that the bearing elements are protected from external influences. Furthermore, a wet space is preferably formed within the bearing housing, in which the bearing elements can be wetted using a lubricant for the plain bearing.

[0032] At least one of the bearing elements is accommodated in a bearing receptacle designed as described above. In one embodiment, the bearing elements are designed as self-lubricating plain bearings.

[0033] In a preferred embodiment, the bearing elements are configured for hydrodynamic support of the rotor shaft. In this case, a wetted surface causes the rotor shaft to float hydrodynamically, thus achieving reliable, low-friction rotation. This also has the advantage of reducing surface pressure due to an intrinsically very uniform load distribution across the oil film and a (supporting) surface area that can be adapted to the respective load case. Preferably, in the hydrodynamic bearing arrangement, a vacuum is generated and drawn into the bearing gap from an oil source, thus ensuring intrinsically sufficient wetting of the bearing gap over the long term.

[0034] The plain bearing comprises several bearing elements, at least one of which, preferably all of which, are adjusted by means of a positioning device with an inclined positioning axis and preferably also permanently supported relative to the bearing mount. Displacement of a bearing element from its adjusted position due to creep phenomena over its service life is sufficiently reliably prevented. Furthermore, one embodiment achieves easy assembly and replaceability, which significantly reduces assembly times.

[0035] According to a further aspect, a rotor for a wind turbine is proposed, comprising at least the following components:

[0036] - a rotor shaft with a rotor axis;

[0037] - at least one plain bearing according to an embodiment as described above;

[0038] - a plurality of rotor blades;

[0039] - a hub, wherein the rotor blades are connected to the rotor shaft via the hub, wherein the rotor shaft is supported axially and / or radially so as to be rotatable about its rotor axis by means of the bearing elements.

[0040] The wind turbine is designed to convert wind energy into electrical power by means of a rotor that can be set in rotation as a result of an air flow and a generator connected to transmit torque.

[0041] For this purpose, the generator is connected by means of a rotor shaft, which is designed to rotate around a rotor axis.

[0042] At least one plain bearing according to the preceding description is provided for supporting the rotor shaft. Preferably, a plurality of plain bearings are arranged around the rotor shaft, with, for example, a bearing element of a plain bearing being arranged in a bearing receptacle.

[0043] To convert wind energy into electrical power, a plurality of rotor blades are provided. These aerodynamically convert the incoming wind into torque, which causes the rotor shaft to rotate. During operation, the rotational energy is converted into electrical energy by the generator. Power is transferred from the rotor blades to the rotor shaft via a hub. The hub typically contains a control gear to adjust the rotor blades (or their flow profile) to the wind speed and, if necessary (for example, during a storm), even to a neutral position.

[0044] Furthermore, the hydrodynamic bearing elements are provided for supporting the rotor shaft. Preferably, one or a plurality of bearing elements are provided for axial support and / or radial support of the rotor shaft. In one embodiment, for example, a two-sided shoulder or a groove (and radially immersed bearing elements) is formed on the rotor shaft for the axial bearing. It should be noted that in one embodiment, two or more bearing points are provided with an axial spacing (relative to the rotor axis), of which preferably only one is configured for axial support, thus forming a so-called fixed-loose bearing arrangement.

[0045] The rotor comprises at least one plain bearing, wherein at least one, preferably all, of the bearing elements of the plain bearing are adjusted by means of a positioning device with an inclined positioning axis and are preferably also permanently supported relative to the bearing mount. Displacement of a bearing element from its adjusted position due to creep phenomena over its service life is sufficiently reliably prevented. Furthermore, one embodiment achieves easy assembly and replaceability, thus significantly reducing assembly times.

[0046] According to a further aspect, a wind turbine is proposed, comprising

[0047] - a tower with a vertical axis;

[0048] - a nacelle with a generator, the nacelle being arranged on the tower and being rotatable about the vertical axis by means of a wind direction tracking device;

[0049] - a rotor rotatable about its rotor axis according to an embodiment as described above, wherein the rotor shaft is connected to the generator in a torque-transmitting manner to convert its rotation about the rotor axis into electrical current. It should be noted that the bearing support or the plain bearing are particularly advantageous for the explicitly mentioned bearing locations of the wind turbine. However, the use of the plain bearing is not limited to this or to wind turbines.

[0050] The wind turbine is designed to convert wind energy into electrical power by means of a rotor that can be set in rotation as a result of an air flow and a generator connected to transmit torque.

[0051] The nacelle is designed to support and preferably house the functional components for energy conversion, particularly preferably with a streamlined exterior. The nacelle is rotatable about its vertical axis relative to the tower, allowing the rotor to be aligned according to the operating state (e.g., according to the prevailing wind direction), namely by means of the so-called wind direction tracking device.

[0052] The rotor with its rotor blades is connected to the rotor shaft, which is connected in the nacelle indirectly (for example via a gearbox and / or an overload clutch) or directly to the generator for power generation.

[0053] The rotor of the wind turbine comprises at least one plain bearing, wherein at least one, preferably all, of the bearing elements of the plain bearing are adjusted by means of a positioning device with an inclined positioning axis and are preferably also permanently supported relative to the bearing mount. Displacement of a bearing element from its adjusted position due to creep phenomena over its service life is sufficiently reliably prevented. Furthermore, one embodiment achieves easy assembly and replaceability, thus significantly reducing assembly times.

[0054] The invention described above will be explained in detail below against the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is in no way limited by the purely schematic drawings, whereby it should be noted that the drawings are not to scale and are not suitable for defining proportions. It is shown in

[0055] Fig. 1 : a wind turbine with nacelle and rotor;

[0056] Fig. 2: a schematic side view of a rotor shaft with radial bearings and axial bearings; and

[0057] Fig. 3: in a schematic sectional view, a bearing element of a bearing holder to be positioned.

[0058] Fig. 1 shows a wind turbine 4 with a nacelle 25 and a rotor 19. The vertical axis 24 (shown horizontally here) of the tower 23 is aligned vertically in the Earth's gravitational field 28, and the rotor axis 20 of the rotor shaft 3 (shown vertically here) is aligned horizontally in the Earth's gravitational field 28 (usually slightly inclined, for example, with the hub 22 inclined upwards by approximately 5° [five degrees] to 7° from the Earth's surface, see Fig. 2). The nacelle 25 at the top of the tower 23 is supported with low friction by the wind direction tracking device 27 and is designed to be rotatable relative to the tower 23 about the vertical axis 24. The nacelle 25 supports and encloses a generator 26 and (at least a large part of) the rotor shaft 3, as well as a bearing device (e.g., designed as a plain bearing 2) for the rotor shaft 3. The bearing shown is indicated as a fixed bearing with radial bearing and axial bearing. For example, this is the so-called main bearing for the rotor 19.For example, a further support (by means of a secondary bearing) is provided for the rotor shaft 3, for example integrated into the generator 26. A.

[0059] A hub 22 is connected to which a plurality of (for example, three, two visible here) rotor blades 21 are connected, thus forming the rotor 19 rotatable about the rotor axis 20. Fig. 2 shows an example of a possible embodiment of a rotor 19 and generator 26 in the nacelle 25 and is explained below.

[0060] Fig. 2 shows a schematic, partially sectioned side view of a rotor shaft 3 rotatable about its rotor axis 20 (as can be used, for example, in a wind turbine 4 according to Fig. 1). On the left of the illustration, a connected hub 22 and two sectioned rotor blades 21 of the rotor 19 are shown, and on the right, a (purely optional) transmission gear 29 and connected generator 26 are shown. The earth's gravitational field 28 is oriented from top to bottom in the illustration. In this embodiment (of many possible), the rotor shaft 3 is supported for low-friction rotation by means of a bearing device with a fixed bearing (on the right as shown) and a loose bearing (left). At least one, preferably both, of the bearings of the bearing device is designed as a plain bearing 2 and is to be supplied with bearing oil.

[0061] For example, at least one of the bearings is designed as a hydrodynamic plain bearing 2. Fig. 3 shows an example of a possible embodiment of a plain bearing 2 (preferably for a segmented plain bearing 2), specifically with an adjustable bearing element 6 on an axial bearing 18, and is explained below.

[0062] Fig. 3 shows a schematic sectional view of a bearing element 6 of a bearing mount 1 to be positioned. Here, a radial bearing 17 (here purely optionally with a tilting element 30) and an axial bearing 18 are shown in a bearing housing 12, both of which are designed (here purely optionally) as plain bearings 2 and, by means of a bearing gap 31 wetted with an oil film, support the central rotor shaft 3 in a low-friction manner about its rotor axis 20. Here (preferably simplified), the rotor axis 20 is shown aligned horizontally to the Earth's gravitational field 28.

[0063] In the embodiment shown, the axial bearing 18 is designed with a bearing element 6 that can be positioned by means of the positioning device 5. However, a radial bearing 17 can also be designed to be positionable in the same way. The bearing axis 7 of the axial bearing 18 (surface normal) is aligned parallel to the rotor axis 20 of the rotor shaft 3 to be supported. The bearing gap 31 can be adjusted by moving the positioning device 5 in the guide rail 8 (here a through opening 11 in the bearing housing 12) along a defined positioning axis 9. The bearing element 6 of the axial bearing 18 to be positioned is preferably fixed to the positioning device 5 and is therefore also moved along the positioning axis 9 with the movement of the positioning device 5.The desired position of the bearing element 6 of the axial bearing 18 to be positioned is set by means of a distance 15 between a stop surface 13 of the positioning device 5 and a corresponding counter surface 14 (here purely optionally of the bearing housing 12). A shim 16 for adjusting the distance 15 and a separate fixing device 10 (here purely optionally formed by a screw connection) relative to the bearing housing 12 are provided here purely optionally. Due to the inclination of the positioning axis 9 relative to the bearing axis 7, the positioning device 5 forms a positive-locking component of the holding force on the axial bearing 18, whereby creep phenomena can be sufficiently reliably prevented over a service life.Independently of this, an externally accessible through-opening 11 is formed in the bearing housing 12, namely by the guide rail 8 for the positioning device 5, through which a bearing element 6 can be inserted into the desired position in the plain bearing 2. It should be noted that, in the embodiment shown, the positioning of the bearing element 6 to be positioned is also easily accessible from the outside.

[0064] With the bearing mount proposed here, the adjustment of a bearing gap is permanently secured.

[0065] List of reference symbols

[0066] Stock taking

[0067] Plain bearings

[0068] rotor shaft

[0069] wind turbine

[0070] Positioning device bearing element to be positioned

[0071] bearing axis

[0072] guide rail

[0073] Positioning axis

[0074] Fixing device

[0075] passage opening

[0076] bearing housing

[0077] Stop surface

[0078] Counter surface

[0079] Distance

[0080] Shim

[0081] Radial bearings

[0082] Thrust bearing

[0083] rotor

[0084] Rotor axis

[0085] rotor blades

[0086] hub

[0087] Tower

[0088] vertical axis

[0089] gondola

[0090] generator

[0091] Wind direction tracking device

[0092] Earth's gravity field

[0093] transmission gear

[0094] Tilting element

[0095] Bearing gap

Claims

Patent claims 1 . Bearing support (1) for a plain bearing (2) for a rotor shaft (3) of a wind turbine (4), comprising at least the following components: - a positioning device (5) for positioning a bearing element (6), wherein the bearing element (6) has a defined bearing axis (7); - a guide rail (8) for guiding the positioning device (5) along a positioning axis (9); and - a fixing device (10) for fixing the positioning device (5) in a position set during assembly, characterized in that the positioning axis (9) is aligned at an inclination to the bearing axis (7) of the bearing element (6) to be positioned.

2. Bearing holder (1) according to claim 1, wherein the guide rail (8) is formed by a through-opening (11), wherein preferably a respective bearing element (6) can be guided through the through-opening (11).

3. Bearing holder (1) according to claim 1 or claim 2, wherein the bearing holder (1) is part of a bearing housing (12).

4. Bearing holder (1) according to one of the preceding claims, wherein the positioning device (5) comprises a stop surface (13), wherein the stop surface (13) can be fixed to a fixed counter surface (14) of the bearing holder (1) with an adjustable distance (15), wherein preferably the distance (15) between the stop surface (13) and the corresponding counter surface (14) can be adjusted by means of at least one shim (16).

5. Bearing holder (1) according to one of the preceding claims, wherein the bearing element (6) to be positioned is a component of a radial bearing (17).

6. Bearing holder (1) according to one of the preceding claims, wherein the bearing element (6) to be positioned is a component of an axial bearing (18).

7. A plain bearing (2) for a rotor shaft (3) of a wind turbine (4), comprising a bearing housing (12) for a plurality of bearing elements (6), wherein at least one of the bearing elements (6) is received in a bearing receptacle (1) according to one of the preceding claims, wherein the bearing elements (6) are preferably designed for hydrodynamic bearings.

8. Rotor (19) for a wind turbine (4), comprising at least the following components: - a rotor shaft (3) with a rotor axis (20); - at least one plain bearing (2) according to claim 7; - a plurality of rotor blades (21); - a hub (22), wherein the rotor blades (21) are connected to the rotor shaft (3) via the hub (22), wherein the rotor shaft (3) is rotatably supported about its rotor axis (20) by means of the bearing elements (6) in each case axially and / or radially.

9. Wind turbine (4), comprising - a tower (23) with a vertical axis (24); - a nacelle (25) with a generator (26), wherein the nacelle (25) is arranged on the tower (23) and is rotatable about the vertical axis (24) by means of a wind direction tracking device (27); - a rotor (19) rotatable about its rotor axis (20) according to claim 8, wherein the rotor shaft (3) is connected to the generator (26) in a torque-transmitting manner for converting its rotation about the rotor axis (20) into electrical current.

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