DE102023106818A1 - Bearing bush, bearing bush assembly and wind turbine bearing for wind turbines - Google Patents

Abstract

The present invention relates to a bearing bush for a wind turbine bearing for supporting a generator, a gearbox or an assembly unit comprising a generator and gearbox of a wind turbine on a foundation-side support structure of the wind turbine and for receiving a main rotor shaft of the wind turbine, comprising an elastomer hollow body, such as a hollow cylinder, the inner and/or outer peripheral surface of which is treated at least in sections in such a way that it has an increased roughness compared to an untreated surface, such as an end face, of the elastomer hollow body.

Description

The present invention relates to a bearing bush for movably holding a generator-side component, such as a gearbox and/or a generator, and a foundation-side component of a wind turbine, a wind turbine bearing for supporting a generator and/or a gearbox of a wind turbine on a foundation-side support structure of the wind turbine, and a bearing bush arrangement.

In wind turbines, a large torque is usually transmitted from the rotor to the generator via a gearbox. Elastic bushings are usually used to reduce the dynamic loads on the gearbox and supporting structure. The elastic bushings serve to decouple oscillations and vibrations. For this purpose, a wind turbine bearing for a machine train of the wind turbine, for example, has a flange with fastening openings. Fastening units, in particular threaded rods or bearing bolts, are fastened in the openings by means of elastomer bodies that serve as dampers. Furthermore, the fastening elements are connected, in particular screwed, to the supporting structure, in particular the housing of the wind turbine.

Elastic bushings of this type must be able to transfer high axial forces, i.e. forces acting in the direction of the main shaft, from the gearbox to the machine support. The elastic bushings known to date have caused adhesion problems, which can be attributed to temperature fluctuations or similar.

Out of EP 2 352 930 B1 A wind turbine bearing is known in which a flange is clamped to the gearbox via two elastomer bodies. At least one of the elastomer bodies is conical and has an angle of approximately 45° in order to be able to transmit forces acting radially and axially in an axial direction between the flange and the gearbox. In the bearing according to EP 2 352 930 B1 On the one hand, the one-sided bracing of the elastomer bodies has proven to be disadvantageous. Furthermore, the use of the fastening bolt of the machine support and fastening flange to brace the elastomer bodies has also proven to be disadvantageous. This is because when the elastomer bodies are braced on one side, axial shear forces occur, which are undesirable. On the other hand, the fastening bolt, on which both the fastening flange and the machine support are mounted, moves in the direction of the bracing component, which is designed as a pressure plate and is provided with a hole that accommodates the bolt, which leads to the machine support and fastening flange beginning to move, namely moving towards each other. The adhesion problems in the longitudinal axis direction described above cannot be solved by the EP 2 352 930 B1 described wind turbine bearings can be solved.

EP 3 992 455 A1 does not concern a generic bearing of the gearbox on the machine frame, but a bearing arrangement for the rotor blades of a wind turbine, where completely different dimensions and forces are decisive or act. In the bearing arrangement, it is intended to provide a friction-increasing layer between ring components of the bearing in order to reduce the slip between the components to be supported. The layer can be applied by coating or by spraying. Although the layer used between the components to be supported leads to an increase in the coefficient of friction, it has been found that under continuous and/or high loads, undesirable relative movements in the axial direction continue to occur between the components to be supported or the layer used. Furthermore, the EP 3 992 455 A1 The spraying and application processes described above are only of limited use for cost-effective and/or assembly-optimized mass production.

It is an object of the present invention to overcome the disadvantages of the known prior art, in particular to improve a bearing bush for movably holding a generator-side component and a foundation-side component of a wind turbine in such a way that the transferable forces in the longitudinal axis direction are increased.

This problem is solved by the features of the independent claims.

According to this, a bearing bush for a wind turbine bearing is provided for supporting a generator, a gearbox or an assembly unit comprising a generator and gearbox of a wind turbine on a foundation-side support structure, such as a machine support, of the wind turbine and for receiving a rotor main shaft, in particular with a diameter of at least 1600 mm, of the energy plant. The bearing bush can be used to movably hold a generator-side component and a foundation-side component of a wind turbine. For example, it is a bearing bush for an elastic bearing of a wind turbine. Elastic bearings are used in wind turbines to absorb dynamic loads that act on the components of the wind turbine. By means of the bearings Oscillation and/or vibration damping and decoupling can take place in the bearing bush. The bearing bush can have a diameter of at least 150 mm, in particular of at least 160 mm, 170 mm or 180 mm, and/or an axial length of at least 150 mm, in particular 160 mm, 170 mm or at least 180 mm, whereby a load-bearing length, i.e. the contact with the supporting structure, can be at least 80 mm, in particular at least 90 mm or less than 100 mm. In addition to the dimensioning of the bearing bush, the forces that can be absorbed and transmitted are crucial when used in a wind turbine. During normal operation of the wind turbine, radial forces of around 220 kN can occur, with an extreme load of up to 500 kN. Bearing bushes of this type have a radial stiffness of up to 220 kN/mm, in particular of approximately 190 kN/mm, and/or an axial stiffness in the range of 6 kN/mm to 10 kN/mm.

The generator-side component can be, for example, a part of the machine train of the wind turbine, which includes the rotor, the generator and transmission elements arranged between them, such as a gearbox, a shaft or a coupling. The generator-side component can in particular be a shaft bearing for a drive shaft of the machine train. The shaft bearing can preferably have a bearing opening in which the shaft of the machine train is mounted. The foundation-side component can be a supporting structure of the wind turbine, which is formed, for example, by the housing of the wind turbine.

For example, the foundation-side component can be a housing that is part of the nacelle of the wind turbine, and the generator-side component can be a shaft bearing or a gearbox of the wind turbine. A bearing bush according to the invention supports the generator-side component in all spatial directions with damping relative to the foundation-side component of the wind turbine. The bearing bush supports, for example, a generator-side component with elastic damping on a foundation-side support structure.

According to the invention, the bearing bush comprises a hollow elastomer body, such as a hollow cylinder, the inner and/or outer circumferential surface of which is treated at least in sections in such a way that it has a higher roughness than an untreated surface, such as an end face, of the hollow elastomer body. By deliberately increasing the coefficient of friction on at least one of the bearing surfaces, the forces that can be transmitted in the longitudinal axis direction of the bush can be increased. In particular, the adhesion problems in the longitudinal axis direction that occurred in the prior art can be solved. By deliberately treating the elastomer bush locally at those points that are responsible for the axial force transmission, it can also be ensured that the basic functionality of the bearing bush in terms of damping and decoupling is maintained. The bearing bush can be designed to be clamped in the longitudinal axis direction in the assembled state in the wind turbine bearing. The bearing bush can also be designed in such a way that a force and surface pressure that is evenly distributed over the entire circumference is achieved. Due to the treatment of the elastomer body to achieve the increase in the coefficient of friction, no additional components such as coating or the like are necessary. Alternative ways of fixing the bearing bush to increase the axial rigidity, for example by gluing or the like, can be avoided in favor of dismantling and better maintenance options. Furthermore, the influence of the surface roughness of the bore on the axial force that can be absorbed is massively reduced. A further advantage of the present invention is that a separation of functions can be achieved, namely the fixing of the bearing bush in the bore or receptacle provided for it on the one hand and the vibration isolation on the other. For example, the present invention makes it possible to use materials of lower hardness and/or due to chemical incompatibility, which are advantageous in terms of vibration isolation, but would be unsuitable due to other aspects that can be circumvented by the treatment to increase the coefficient of friction.

The hollow elastomer body has a cavity for receiving a foundation- or generator-side bearing bolt, which is, for example, screwed to the foundation- or generator-side component and protrudes through a through-hole in the other component. The bearing bolt defines a longitudinal direction of the bearing bush. The inside of the elastomer body can be in contact with the bearing bolt. The outside of the elastomer body can accordingly be in contact with the foundation- or generator-side component, in particular with the through-hole of the foundation- or generator-side component. In particular, it can be provided that the elastomer body is arranged completely in the through-hole of the foundation- or generator-side component, i.e. does not protrude from the through-hole in the longitudinal direction of the bearing bolt.

According to a further aspect of the present invention, which is combined with the preceding aspects and exemplary embodiments A bearing bush is provided for movably holding a generator-side component and a foundation-side component of a wind turbine. The bearing bush for a wind turbine bearing can be used to support a generator, a gearbox or an assembly unit comprising a generator and gearbox of a wind turbine on a foundation-side support structure, such as a machine support, of the wind turbine and to accommodate a main rotor shaft, in particular with a diameter of at least 1600 mm, of the energy plant. For example, it is a bearing bush for an elastic bearing of a wind turbine. Elastic bearings are used in wind turbines to absorb dynamic loads which act on the components of the wind turbine. The bearing bush can be used to dampen and decouple oscillations and/or vibrations. The bearing bush can have a diameter of at least 150 mm, in particular of at least 160 mm, 170 mm or 180 mm, and/or an axial length of at least 150 mm, in particular 160 mm, 170 mm or at least 180 mm, wherein in particular a load-bearing length, i.e. the contact with the supporting structure, can be at least 80 mm, in particular at least 90 mm or less than 100 mm. In addition to the dimensioning of the bearing bush, the absorbable and transferable forces are crucial when used in a wind turbine. During normal operation of the wind turbine, radial forces of around 220 kN can occur, with an extreme load of up to 500 kN. Bearing bushes of this type have a radial stiffness of up to 220 kN/mm, in particular of around 190 kN/mm, and/or an axial stiffness in the range from 6 kN/mm to 10 kN/mm.

The generator-side component can be, for example, a part of the machine train of the wind turbine, which includes the rotor, the generator and transmission elements arranged between them, such as a gearbox, a shaft or a coupling. The generator-side component can in particular be a shaft bearing for a drive shaft of the machine train. The shaft bearing can preferably have a bearing opening in which the shaft of the machine train is mounted. The foundation-side component can be a supporting structure of the wind turbine, which is formed, for example, by the housing of the wind turbine.

For example, the foundation-side component can be a housing that is part of the nacelle of the wind turbine, and the generator-side component can be a shaft bearing or a gearbox of the wind turbine. A bearing bush according to the invention supports the generator-side component in all spatial directions with damping relative to the foundation-side component of the wind turbine. The bearing bush supports, for example, a generator-side component with elastic damping on a foundation-side support structure.

According to the further aspect, the bearing bush comprises a hollow elastomer body, such as a hollow cylinder, the inner and/or outer circumferential surface of which is treated at least in sections by gluing or pouring in an abrasive material or a friction agent, such as a net or braid, in particular made of metal, plastic, ceramic, glass fibers or carbon fibers, in such a way that it has a higher roughness than an untreated surface, such as an end face, of the hollow elastomer body. By deliberately increasing the coefficient of friction on at least one of the bearing surfaces, the forces that can be transmitted in the longitudinal axis direction of the bush can be increased. In particular, the adhesion problems in the longitudinal axis direction that occurred in the prior art can be solved. By deliberately treating the elastomer bush in those places that are responsible for the axial force transmission, it can also be ensured that the basic functionality of the bearing bush in terms of damping and decoupling is maintained. The specific measure of gluing or pouring in can prove to be particularly advantageous for the present use of the bearing bush in terms of manufacturability and durability. Both when pouring in and when gluing on the abrasive and/or propellant responsible for increasing the coefficient of friction, a firm connection is created between the inner or outer peripheral surface and the abrasive or friction agent.

In an exemplary embodiment of the bearing bush according to the invention, the abrasive material or the friction agent is at least partially embedded in the material of the elastomer hollow body, in particular anchored therein. For example, the abrasive material or the friction agent can be embedded to more than 10%, in particular to more than 20%, more than 30%, more than 40% or more than 50% of a friction surface with the inner or outer surface of the elastomer hollow body. The abrasive material or the friction agent can cause an anchoring when embedded, which results in an increased fastening force between the abrasive material or friction agent and the elastomer body. The anchoring can be achieved, for example, by means of barb-like anchoring and/or locking structures, in particular dimensioned in the millimeter, micrometer or nanometer range.

According to a further exemplary embodiment of the bearing bush according to the invention, the abrasive material has a grain size of less than 5 mm, in particular less than 4 mm, less than 3 mm or less than 2 mm. In principle, grain sizes in the micrometer range or even in the nanometer range are also conceivable.

In a further exemplary embodiment of the present invention, the abrasive material is applied to a carrier or inserted as a composite material into a matrix. The abrasive material can be applied to the carrier, for example by gluing, or can also be cast in.

According to a further exemplary embodiment of the bearing bush according to the invention, the stimulant has a net or braided structure with a mesh size of at least 0.25 mm, 0.5 mm or at least 1 mm and/or less than 5 mm, less than 4 mm or less than 3 mm. The mesh size described has proven to be advantageous with regard to the requirements regarding the attachment to the elastomer body, in particular embedding, and with regard to the increase in the coefficient of friction when storing the components to be used.

According to a further aspect of the present invention, which can be combined with the preceding aspects and exemplary embodiments, a bearing bush is provided for movably holding a generator-side component and a foundation-side component of a wind turbine. The bearing bush for a wind turbine bearing can be used to support a generator, a gearbox or an assembly unit comprising a generator and gearbox of a wind turbine on a foundation-side support structure, such as a machine support, of the wind turbine and for receiving a main rotor shaft, in particular with a diameter of at least 1600 mm, of the energy plant. For example, it is a bearing bush for an elastic bearing of a wind turbine. Elastic bearings are used in wind turbines to absorb dynamic loads that act on the components of the wind turbine. Oscillation and/or vibration damping and decoupling can take place by means of the bearing bush. The bearing bush can have a diameter of at least 150 mm, in particular of at least 160 mm, 170 mm or 180 mm, and/or an axial length of at least 150 mm, in particular 160 mm, 170 mm or at least 180 mm, wherein in particular a load-bearing length, i.e. the contact with the supporting structure, can be at least 80 mm, in particular at least 90 mm or less than 100 mm. In addition to the dimensioning of the bearing bush, the absorbable and transferable forces are crucial when used in a wind turbine. During normal operation of the wind turbine, radial forces of around 220 kN can occur, with an extreme load of up to 500 kN. Bearing bushes of this type have a radial stiffness of up to 220 kN/mm, in particular of around 190 kN/mm, and/or an axial stiffness in the range from 6 kN/mm to 10 kN/mm.

The generator-side component can, for example, be a part of the machine train of the wind turbine, which comprises the rotor, the generator and transmission elements arranged therebetween, such as a gearbox, a shaft or a coupling.

The generator-side component can in particular be a shaft bearing for a drive shaft of the machine train. The shaft bearing can preferably have a bearing opening in which the shaft of the machine train is mounted. The foundation-side component can be a supporting structure of the wind turbine, which is formed, for example, by the housing of the wind turbine.

For example, the foundation-side component can be a housing that is part of the nacelle of the wind turbine, and the generator-side component can be a shaft bearing or a gearbox of the wind turbine. A bearing bush according to the invention supports the generator-side component in all spatial directions with damping relative to the foundation-side component of the wind turbine. The bearing bush supports, for example, a generator-side component with elastic damping on a foundation-side support structure.

According to the further aspect, the bearing bush comprises a hollow elastomer body, such as a hollow cylinder, the inner and/or outer circumferential surface of which is treated at least in sections by means of a chemical, mechanical and/or thermal surface treatment in such a way that it has an increased roughness compared to an untreated surface, such as an end face, of the hollow elastomer body. By deliberately increasing the coefficient of friction on at least one of the bearing surfaces, the forces that can be transmitted in the longitudinal axis direction of the bush can be increased. In particular, the adhesion problems in the longitudinal axis direction that occurred in the prior art can be solved. By deliberately treating the elastomer bush locally at those points that are responsible for the axial force transmission, it can also be ensured that the basic functionality of the bearing bush in terms of damping and decoupling is maintained. Mechanical, thermal and/or chemical surface treatments can be very well integrated into the manufacturing processes. process of the elastomer hollow body. Furthermore, with such surface treatment measures, additional components responsible for increasing the coefficient of friction can be dispensed with.

In an exemplary embodiment of the bearing bush according to the invention, the inner and/or outer circumferential surface is brought into a liquid or dried state at least in sections, in particular at least close to the surface, and treated to increase the friction value. For example, in the liquid or dried state, an additive that increases the friction value, such as an abrasive or an irritant, for example ground or sand, is applied to the inner and/or outer surface. For example, the elastomer hollow body can be selected in the additive for application. Furthermore, the additive can be applied with a roller.

According to a further aspect of the present invention, which can be combined with the preceding aspects and exemplary embodiments, a bearing bush arrangement is provided comprising a plurality of bearing bushes according to the invention, in particular 6, 8, 12, 15, 20, 25, 30 or 32. According to the invention, the bearing bushes are arranged in a clock face arrangement, in particular equidistantly around an axis of a wind turbine bearing.

According to a further aspect of the present invention, which can be combined with the preceding aspects and exemplary embodiments, a wind turbine bearing is provided for supporting a generator-side component, such as a generator, a gearbox or an assembly unit comprising a generator and gearbox, of a wind turbine on a foundation-side component, such as a supporting structure, of the wind turbine.

The wind turbine bearing comprises a plurality of bearing bushes according to the invention and/or a bearing bush arrangement according to the invention. It can be provided that the bearing bushes and/or the bearing bush arrangement is/are arranged at an assembly interface between the generator and the rotor. Such a wind turbine bearing offers the advantage that it requires only a small installation space, is inexpensive to manufacture and is easy and safe to assemble.

According to an exemplary embodiment of the wind turbine bearing according to the invention, the wind turbine bearing comprises a passage for receiving a rotor shaft or main shaft of the wind turbine. For example, the passage has a diameter of at least 1600 mm in order to be able to receive the rotor shaft.

Preferred embodiments are specified in the subclaims.

• 1 eine schematische perspektivische Ansicht einer beispielhaften Ausführung eines erfindungsgemäßen Windenergieanlagenlagers; und
• 2 eine Schnittansicht einer beispielhaften Ausführung einer erfindungsgemäßen Lagerbuchse im montierten Zustand in einem Windenergieanlagenlager.

In the following, further properties, features and advantages of the invention will become clear by describing preferred embodiments of the invention with reference to the accompanying exemplary drawings, in which:

• 1 a schematic perspective view of an exemplary embodiment of a wind turbine bearing according to the invention; and
• 2 a sectional view of an exemplary embodiment of a bearing bush according to the invention in the assembled state in a wind turbine bearing.

In the following description of exemplary embodiments, a bearing bush according to the invention is generally provided with the reference number 1. A bearing bush 1 according to the invention can be part of a bearing bush arrangement according to the invention comprising several bearing bushes 1, in 1 shown by way of example using 32 bearing bushes 1. The individual bearing bushes 1 can be arranged in a clock face arrangement, in particular equidistant around an axis A of a wind turbine bearing according to the invention, which is indicated by the reference number 10. A wind turbine bearing according to the invention serves to support a generator-side component 3 of a wind turbine, for example a generator, a gearbox or an assembly unit comprising a generator and gearbox, on a foundation-side component 5 of the wind turbine, for example a supporting structure. In the wind turbine bearing 1, the bearing bushes 1 or the bearing bush arrangement can be arranged, for example, at an assembly interface between the generator and the rotor of the wind turbine. The bearing bush 1 is intended in particular for a wind turbine bearing for supporting a generator, a gearbox or an assembly unit comprising a generator and gearbox (general reference numeral 3) of a wind turbine on a foundation-side support structure 5 of the wind turbine and for receiving a main rotor shaft 4 of the wind turbine.

1 shows a perspective view of a section of a wind turbine in which the gearbox 3 is mounted on the machine support 5 via the rotor main shaft 4 accommodated in a bushing 6 by means of a clock face arrangement made up of 32 bearing bushes 1. The clock face arrangement The arrangement is realized by providing a fastening flange 12 which is arranged concentrically with respect to the axis A and which has a separate receptacle 14 for each bearing bush 1.

The 1 to 2 show an exemplary embodiment of a bearing bush 1 according to the invention. 1 shows the bearing bush 1 in perspective view installed in a wind turbine bearing 10.

The wind turbine bearing 10 according to the invention comprises the following main components (see 2 ): An inner elastomer hollow body 7 for support on a generator-side bearing pin 11 that is firmly connected to the generator-side component 3; an outer elastomer hollow body 9 for support on the foundation-side component 5; and a surface treatment, generally indicated by the reference numeral 20, for increasing the friction coefficient of the elastomer material compared to an untreated surface of the elastomer hollow body 7, 9.

Furthermore, the wind turbine bearing 10 comprises a bracing assembly 13 with a support bushing 15 arranged between the inner elastomer body 7 and the outer elastomer body 9 and supported on both elastomer bodies 7, 9.

2 shows a bearing bush 1 from 1 in a sectional view along the line II - II in 1 . It can be seen that the bearing bolt 11 is screwed into the generator-side component 3. The bearing bolt 11 protrudes vertically from a surface 17 of the generator-side component 3 facing the foundation-side component 5 and protrudes through a through hole 19 in the foundation-side component 5. The bearing bolt 11 thus defines a longitudinal direction L of the bearing bush 1. In the version in the 1 to 2 A hollow cylindrical bushing 23 is arranged around the bearing pin 11, which is also screwed into the generator-side component 3. This is considered as part of the bearing pin 11 in the following description of the function of a bearing bushing 1 according to the invention.

In 2 It can also be seen that the entire bearing bush 1, i.e. the two elastomer bodies 7, 9, including the bracing assembly 13, are completely arranged in the through hole 19 of the foundation-side component 5. The elastomer bodies 7, 9 are in the design in the 1 to 2 hollow cylindrical and each have a cavity 8 through which the bearing pin 11 and the bushing 13 protrude. The outer elastomer body 9 is in contact with the foundation-side component 5 or with the through-hole 19 of the foundation-side component 5 and the inner elastomer body 7 is in contact with the bushing 23.

In this embodiment, the support bushing 15 is also designed to be rotational and has a hollow casing 16 with a through-opening 26 for the clamping device 28. The support bushing 15 is arranged between the inner elastomer body 7 and the outer elastomer body 9 and separates the two elastomer bodies 7, 9 from one another. Accordingly, an inner casing surface 25 of the support bushing 15 is supported on the inner elastomer body 7 and an outer casing surface 27 of the support bushing 15 is supported on the outer elastomer body 9.

The clamping device 28 comprises eight clamping screws 29 which are arranged in a rotational manner and evenly around an axis of the bearing bush 1 defined by the longitudinal direction L. The support bush 15 serves to guide the clamping screws 29 and to provide the necessary installation space for the clamping screws 29. The clamping assembly 13 also comprises two clamping disks 31, 33 for each of the eight clamping screws 29, which are screwed onto the respective clamping screw 29 and together can be referred to as abutments 30. The clamping disks 31, 33 are located on both sides of the elastomer bodies 7, 9, in other words the elastomer bodies 7, 9 are arranged between the clamping disks 31, 33.

In 2 the bearing bush 1 or the outer elastomer body 9 is shown in an uncompressed state, which can also be referred to as the unloaded state, before the tensioning assembly 13 is activated to bring the bearing bush into a tensioned state. The inner elastomer body 7 is uncompressed in both the unloaded state and the tensioned state. This allows the necessary preload force of the bearing bush 1 to be reduced.

When the tensioning assembly 13 is activated, the clamping disks 31, 33 on the tensioning screw 29 move in the longitudinal direction L towards the elastomer bodies 7, 9. The clamping disk 33 arranged at the end of the tensioning screw 29 screws onto the tensioning screw 29 when the tensioning screw 29 is turned. As a result, the clamping disk 33 and the clamping disk 31 resting on the head of the tensioning screw 29 move towards each other and compress the outer elastomer body 9 arranged between them in the longitudinal direction L from both sides. The outer elastomer body 9 is thereby compressed in the axial direction and expands in the radial direction, i.e. transversely to the axial direction or longitudinal direction L. In the case of a equal to the unloading and tensioning state, it can be seen that the outer elastomer body 9 in the uncompressed state in 2 in the longitudinal direction L protrudes beyond the support bush 15 on both sides and in the compressed state has the same width in the longitudinal direction L as the support bush 15. It can also be seen that in 2 a distance exists between the clamping disks 31, 33 and the inner elastomer body 7, which disappears when the clamping assembly 13 is activated by the clamping disks 31, 33 moving towards each other.

By compressing the outer elastomer body 9, a force-fit connection is created between the outer elastomer body 9 and the through-hole 19 of the foundation-side component 5. In this way, the bearing bush 1 is clamped or fixed in the through-hole 19 of the foundation-side component 5 and thus supports the generator-side component 3 on the foundation-side component 5. By compressing the outer elastomer body 9 on both sides, no undesirable shear forces arise and displacement of the outer elastomer body 9 or the entire bearing bush 1 can be prevented, so that the distance between the surface 21 of the foundation-side component 5 and the surface 17 of the generator-side component 3 remains the same in the uncompressed and compressed state.

As in 2 As can be seen, there is no radial contact between the clamping screws 29 and the through hole 26 of the support bush 15. There is therefore a direct flow of force between the clamping screw 29, the first clamping disk 31, the outer elastomer body 9, the second clamping disk 33 and finally the clamping screw 29 again. The flow of force is therefore self-contained.

The bearing bush 1 according to the invention offers the advantage that it can be mounted easily and inexpensively by inserting it from one side of the wind turbine bearing into the 2 and 3 from the left. In the version in the 1 to 3 the inner elastomer body 7 can be pressed onto the bushing 23 and together with it into the 2 and 3 from the left into the through hole 19 of the foundation-side component 5 and screwed into the generator-side component 3. To activate the tensioning device 13, the clamping screws 29 can be tightened. This allows the bearing bush 1 to be mounted without difficult-to-handle hydraulic clamping tools. A surface 21 of the foundation-side components 3 facing the generator-side components 3 is aligned parallel to the surface 17 of the generator-side component 3. The distance between the surface 17 of the generator-side component 3 and the surface 21 of the foundation-side component 5 is approximately 5 mm to 20 mm.

The surface treatment 20 to increase the coefficient of friction can increase the forces that can be transmitted in the longitudinal axis direction of the bearing bush 1. In particular, the adhesion problems in the longitudinal axis direction that occurred in the prior art can be solved. It can also be ensured that the basic functionality of the bearing bush 1 with regard to damping and decoupling is maintained.

The features disclosed in the above description, the figures and the claims can be important both individually and in any combination for the realization of the invention in the various embodiments.

List of reference symbols

1

Bearing bush

3

generator-side component

4

Rotor main shaft

5

foundation component

6

Implementation

7

inner elastomer body

8

cavity

9

outer elastomer body

10

Wind turbine bearings

11

Bearing bolt

12

Mounting flange

13

Bracing assembly

14

Recording

15

Support bushing

16

Coat

17

Area generator-side component

19

Passage opening

20

Surface treatment

21

Area foundation side component

23

Socket

25

inner shell surface

26

Passage opening

27

external surface

28

Clamping device

29

Clamping screw

30

Abutment

31, 33

Clamping disc

L

Longitudinal direction

A

axis

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was 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 accepts no liability for any errors or omissions.

Cited patent literature

• EP 2352930 B1 [0004]
• EP 3992455 A1 [0005]

Claims (12)

Bearing bush (4) for a wind turbine bearing for supporting a generator, a gearbox or an assembly unit comprising a generator and gearbox of a wind turbine on a foundation-side support structure of the wind turbine and for receiving a main rotor shaft of the wind turbine, comprising an elastomer hollow body (7, 9), such as a hollow cylinder, the inner and/or outer peripheral surface of which is treated at least in sections such that it has an increased roughness compared to an untreated surface, such as an end face, of the elastomer hollow body (7, 9). Bearing bush (4), in particular after Claim 1 , for movably holding a generator-side component and a foundation-side component of a wind turbine, comprising a hollow elastomer body (7, 9), such as a hollow cylinder, the inner and/or outer peripheral surface of which is treated at least in sections by gluing on or pouring in an abrasive material or a friction agent, such as a net or braid, in particular made of metal, plastic, ceramic, glass fibers and/or carbon fibers, such that it has an increased roughness compared to an untreated surface, such as an end face, of the hollow elastomer body (7, 9). Bearing bush (4) after Claim 2 , wherein the abrasive substance or the friction agent is at least partially embedded in the material of the elastomer hollow body (7, 9), in particular anchored therein. Bearing bush (4) after Claim 2 or 3 , wherein the abrasive material has a grain size of less than 5 mm, in particular less than 4 mm, 3 mm or less than 2 mm. Bearing bush (4) according to one of the Claims 2 until 4 , where the abrasive is applied to a carrier or embedded as a composite material in a matrix. Bearing bush (4) according to one of the Claims 2 until 5 , wherein the friction means has a net or braid structure with a mesh size of at least 0.25 mm, 0.5 mm or at least 1 mm and/or less than 5 mm, less than 4 mm or less than 3 mm. Bearing bush (4), in particular according to one of the preceding claims, for movably holding a generator-side component and a foundation-side component of a wind turbine, comprising an elastomer hollow body (7, 9), such as a hollow cylinder, the inner and/or outer circumferential surface of which is treated at least in sections by means of a chemical, mechanical and/or thermal surface treatment (20) in such a way that it has an increased roughness compared to an untreated surface, such as an end face, of the elastomer hollow body (7, 9). Bearing bush (4) after Claim 7 , wherein the inner and/or outer peripheral surface is brought into a liquid or viscous state at least in sections, in particular at least close to the surface, and is treated to increase the coefficient of friction, wherein in particular in the liquid or viscous state an additive which increases the coefficient of friction, such as an abrasive substance or a friction agent, is applied to the inner and/or outer peripheral surface. Bearing bush arrangement comprising several, in particular at least 6, 8, 12, 15, 20, 25, 30 or 32, bearing bushes (4) according to one of the preceding claims, wherein the bearing bushes (4) are arranged in a clock face arrangement, in particular equidistantly around an axis of a wind turbine bearing. Wind turbine bearing for supporting a generator-side component, such as a generator, a gearbox or an assembly unit comprising a generator and gearbox, of a wind turbine on a foundation-side component, such as a supporting structure, of the wind turbine, comprising a plurality of bearing bushes (4) and/or a bearing bush arrangement according to one of the preceding claims. Wind turbine bearings according to Claim 10 , wherein the bearing bushes (4) and/or the bearing bush arrangement are arranged at a mounting interface between the generator and the rotor. Wind turbine bearings according to Claim 10 or 11 , further comprising a passage for receiving a main rotor shaft of the wind turbine, wherein in particular the passage has a diameter of at least 1600 mm.

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