BE1029850B1 - Main bearing arrangement for a wind turbine - Google Patents

Abstract

The present invention relates to a main bearing arrangement for mounting a rotatable rotor (1) of a wind turbine, the rotor (1) being mounted rotatably relative to a connecting structure via at least one roller bearing (2), the roller bearing (2) having an outer ring (3), which is connected via its radial outer peripheral surface (4) to an annular receptacle (A) of the connecting structure via a press fit, in order to provide a main bearing arrangement for the rotatable mounting of a rotor of a wind turbine, in which the damage described above, which is caused by ring migration, is avoided of the roller bearing outer ring arranged by means of a press fit in an annular receptacle of the adjacent structure, it is proposed that the outer ring (3) has at least one first positive-locking element (7) on at least one axial end face (6), with a counter-element (8) connected to the adjacent structure in a non-rotatable manner is provided, which has at least one second form-fitting element (9), and wherein between the first (7) and the second form-fitting element (9) an effective form-fitting connection (10) is formed in the circumferential direction of the outer ring (3).

Description

' BE2021/5812

Main bearing arrangement for a wind turbine

Description

The invention relates to a main bearing arrangement for a wind turbine. With a

The main bearing is the rotor of a wind turbine (e.g. the rotor shaft, which

Rotor hub of a wind turbine connected to a gearbox or directly to a generator to generate electricity).

In the publication EP 2 947 339 B1 it is described that in known

Main bearing arrangements for supporting a rotatable rotor of a wind turbine, the rotor being rotatable via at least one roller bearing in relation to a non-rotatable one

Connection structure of the wind turbine is stored, the roller bearing a

Has an inner ring which, via its radial inner peripheral surface, is connected to a lateral surface of the

Rotor is connected via a press fit.

EP 2 947 339 B1 deals with the problem of so-called ring creep, which occurs in particular with large bearings that are used as the main bearing of the rotor/rotor shaft

Wind turbines are used and have several meters in diameter is a relevant problem. In EP 2 947 339 B1, the problem of

Ring wandering in the main bearings of wind turbines and from the prior

Technically known measures to prevent ring migration are described in detail as follows:

With rolling bearings becoming larger and larger, a secure bearing seat in particular has turned out to be problematic. Main bearings of rotors of wind turbines are usually positioned or fastened by means of so-called press fits, i.e. a respective bearing ring of the roller bearing, i.e. an inner ring and an outer ring, are pressed into a corresponding ring-shaped receptacle on the rotor or on the connecting structure. This is a mating fit with oversize, which creates a force-fit connection (also referred to as an "interference connection").

With large bearing diameters, there is a very unfavorable ratio of

Diameter/ring cross-section, with which a sufficient force (joint pressure) for a zo tight bearing seat can no longer be ensured. A further increase in

Excess fit only leads to a slight increase in joint pressure, since

? BE2021/5812 the thin-walled bearing ring expands more easily, whereas the more massive rotor or the more massive connection construction only constricts slightly. One too strong

Expansion of the bearing ring in turn leads to high tensile stresses or

Compressive stresses in the bearing ring, leading to a negative impact on the

Raceway geometry can lead to deviations in the shape of the bearing ring. Furthermore, this also changes the bearing clearance, i.e. a positive bearing clearance, in many bearing designs, which can have a direct negative effect on the service life and smooth running of the bearing.

The resulting insufficient press fit between bearing ring and rotor/

Connection construction therefore carries the risk of fretting corrosion and ring creep, which can lead to failure of the roller bearing and/or the rotor (the rotor shaft) or the

Connection construction (also referred to as the "housing" of the wind turbine nacelle) leads. The damage mechanism usually begins with small relative movements in the bearing seat between this and the bearing ring, which are possible due to insufficient stresses or forces (joint pressure). This leads to the sliding

Twisting (in the circumferential direction) and shifting (in the axial direction) of the mating surfaces in relation to one another. As a result, surface layer particles are usually sheared off the softer component, resulting in holes and scale-like material particles. This wear mechanism is referred to as adhesive wear. This process is superimposed and accelerated by oxidation in the fitting joint. Due to the relative movements, water, oxygen and other media can enter the

reach the contact area, which in turn leads to a chemical reaction that occurs in

Combination with the component movement is referred to as tribo-oxidation.

As a rule, the softer part in the

Wear chain, which is usually the shaft or the housing / the

Connection construction is. Often, material is removed over a large area under the bearing and ultimately the shaft breaks directly at the bearing seat due to the

Notch effect and high forces. This problem is reinforced by the required

Lightweight construction in wind power. Due to the limited tower head masses, the so demanding transport and the expensive crane capacities, attempts are being made to make the mechanical structures lighter. Machine carrier, shaft and housing are therefore not (any longer) to be regarded as highly rigid structural components. But exactly a very stiff environment is used in the basic design by the rolling bearing manufacturers for each

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roller bearings required. The structural components of modern wind turbines deform so massively under the high wind loads that the roller bearing seat also has a large surface area

is subject to deformation. These global deformations add to the

Worsening of the problem with regard to fretting corrosion and adhesive wear.

Another problem with the increasing bearing size is the increased tolerances for the bearing seating surfaces. A fit for a bearing ring with a diameter of 2.5 m has a very high tolerance range. Combined with the equally high tolerance range for the bearing seat on the shaft or on the housing, there is a high fluctuation in the

interference fit. If these high tolerances coincide unfavorably, only a very small proportion of joint pressure remains in the press fit. This press fit is therefore particularly susceptible to relative movement, which triggers fretting corrosion and adhesive wear. This also explains the different failure rates in the event of damage caused by

Fretting corrosion and wear in the interference fit.

There are currently no adequate technical solutions to this problem, especially for the main bearings of wind turbines. Specific

Plastic coatings such as PTFE on the bearing ring and/or on the bearing seat on the

Shaft or on the housing can somewhat reduce the problem of the chemical reaction between the two metallic spacers. However, the

The problem of low joint pressure cannot be solved with such coatings. Hard layers such as DLC (Diamond Like Carbon) or hard chrome coating for the bearing ring and/or shaft or housing can reduce adhesive wear, but the problem of the chemical reaction and thus the

fretting corrosion exist. Because both alternatives only one of the two

Reduce wear mechanisms and are also associated with very high costs, they are not used in main bearings.

Alternatively, single-bearing solutions with bolted

outer rings and later also the inner ring of the main bearing. However, the focus here was not on the press fit, but on creating a presettable one

bearing arrangement.

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However, as is known, the screwing of bearing rings is associated with numerous disadvantages. These include high ring cross-sections (weight & costs), limited rigidity of the screw connection and difficult assembly of such roller bearing systems.

EP 2 947 339 B1 proposes reducing or even eliminating the problems described with regard to fretting corrosion, adhesive wear and

Ring migration before that the rolling elements of the main bearing on the rotor shaft or the

Housing / the adjacent construction directly without a separate bearing ring on a

Career support that is an integral part of the rotor shaft or the housing / the

Connection construction is. However, this measure has several serious disadvantages.

On the one hand, they must be integrated into the rotor shaft or the housing

Rolling element raceways are hardened in order to achieve the required service life of the

to reach the main camp. This is integral with the rotor shafts and at

However, raceways formed from housing components are technically very difficult, complex and expensive because, for example, only the integrated raceway on the entire rotor shaft has to be selectively heated and quenched for hardening, but the entire raceway

Rotor shaft must be handled. For another, it is not possible in the case of a

Bearing damage to replace the bearing or individual bearing rings, but it is necessary to replace the entire component with the integrated rolling element race, which is much more complex and causes much higher costs.

The publication DE 10 2017 109 148 A1 describes an anti-rotation device for a roller bearing to prevent ring creep and to simultaneously achieve a desired bearing preload in a housing-shaft arrangement. The

Shaft is rotatably mounted on the roller bearing relative to the housing. The inner ring of

Rolling bearing is rotatably connected to the shaft. The outer ring of the roller bearing is prestressed relative to the housing in the axial direction and against a securing element

Secured against twisting. The securing element is designed as a wave spring. The

Wave spring engages with a first protruding in the axial direction

Spring arc area in at least one recess of the outer ring of the roller bearing.

At the same time, the wave spring has at least one second spring arc area, which engages in a recess of a component fixed to the housing.

The anti-rotation device described in DE 10 2017 109 148 A1 seems to be suitable for the

Use in smaller housing-shaft assemblies, for example in motor vehicles

> BE2021/5812 to be provided. For use in main bearing assemblies of

This anti-rotation device is not suitable for wind turbines because it would require a very large wave spring with a diameter of several meters. This additional securing element would greatly increase the overall weight of the main bearing assembly. The installation of such a wave spring would be very difficult and expensive. In addition, it would not be possible to apply the large forces required to axially preload the slewing bearings of main bearing assemblies of wind turbines via a system installed according to the teaching of DE 10 2017 109 148 A1

apply wave spring.

The present invention is based on the object of providing a main bearing arrangement for the rotatable mounting of a rotor of a wind turbine available, in which the damage described above is avoided

Annular migration of the means of a press fit in an annular receptacle

Connection construction arranged roller bearing outer ring occur.

This problem is solved by a main bearing arrangement with the features specified in the independent claim. Advantageous developments result from the dependent claims, the following description and the

Drawings.

The invention relates to a main bearing arrangement for supporting a rotatable

Rotor of a wind turbine, wherein the rotor is rotatably mounted on at least one roller bearing relative to a connecting structure, the roller bearing having a

Has AuBenring, which has an annular over its radial outer peripheral surface

Recording of the adjacent construction is connected via a press fit. It can be a pure radial bearing, or a bearing, which both

Absorbs or transmits radial and axial forces.

According to the invention it is provided that the outer ring (3) on at least one axial

Face (6) has at least one first form-fitting element (7), with a counter-element (8) which is non-rotatably connected to the connecting structure being provided and which has at least one second form-fitting element (9), and between the first (7) and the second form-fitting element (9) one in the circumferential direction of

Outer ring (3) effective positive connection (10) is formed.

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The counter-element can be formed by a connecting structure by a radial

Flange are formed. Alternatively, a ring non-rotatably connected to the connecting structure can also form the counter-element. Such a ring can be non-rotatably connected to the connecting structure in different ways, e.g.

By means of screw connections, by welding, gluing or soldering, etc.

The solution according to the invention has the advantage that no highly accurate

Manufacturing of the axial faces (groove and nose) is necessary. By a circumferential, occurring during operation of the camp setting the form-fitting

Connection between bearing ring and counter-element and an associated

Increasing the load-bearing peripheral areas of the connection results in an increasing peripheral load-bearing capacity and rigidity of the connection. With everyone

Settling is the circumferential relative movement of the bearing ring and

Connection construction smaller and ultimately comes to a standstill. The

Settling phenomena are caused by the forces acting in the circumferential direction, which occur between the outer ring and the mating element. At least one

The form-fitting element works itself into the components involved in the form-fitting connection, so to speak. In the end, ring wandering and slipping is completely prevented.

By the invention, the damage described above, caused by

Ring migration caused reliably prevented.

According to one embodiment of the main bearing arrangement according to the invention, it is provided that a plurality of first and second

Form-locking elements are arranged, preferably wherein the peripheral portions between adjacent form-locking elements are of equal length. As a result, a large area of the form-fitting connection is used overall in the circumferential direction

provided. Each individual positive connection is therefore only exposed to comparatively low surface pressures. The service life of bearing assemblies with a plurality of positive connections can be compared

Embodiments with only a single form-fitting connection can be significantly increased. If the individual form-fitting connections are distributed evenly over the circumference, i.e. if the circumferential sections between adjacent form-fitting connections are of the same length, the forces in

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Circumferentially introduced very evenly from the outer ring into the counter-element and undesirable deformation of the outer ring due to circumferential forces introduced unevenly into the counter-element is avoided.

According to one embodiment of the main bearing arrangement according to the invention, it is provided that the counter-element is a component which is non-rotatably connected to the connecting structure or is integrally formed on the connecting structure

Flange is, wherein the at least one second form-fitting element at an axial

Face of the component or the flange is formed, which of the axial

Face of the outer ring with the at least one first form-fitting element

is facing. Due to the fact that the form-fitting elements are arranged on the end faces of the respective structural elements, the form-fitting elements can be designed in such a way that they have a great length in the radial direction. To this

In this way, a large force transmission surface is made available in the circumferential direction, which in turn contributes to relatively low surface pressures in the single positive connection or in the individual positive connections. Also, those are arranged on the end faces of the components

Form-fitting elements easy to produce in terms of manufacturing technology, which contributes to the realization of low manufacturing costs.

According to one embodiment of the main bearing arrangement according to the invention it is provided that the at least one first form-fitting element as a projection projecting in the axial direction opposite the end face of the outer ring and the at least one second form-fitting element as in the axial direction opposite the

Front face of the component or the flange recess is formed, or that the at least one first form-fitting element as in

Recessed in the axial direction relative to the end face of the outer ring

Recess and the at least one second positive-locking element is designed as a projection projecting in the axial direction relative to the end face of the component or the flange, the projection extending into the recess to form the in

Circumferentially effective positive connection engages. Form-fitting connections formed in this way have form-fitting elements which are formed integrally with the respective component (outer ring or counter-element). Separate, formed separately from the outer ring or the counter-element

Connecting elements are therefore not required to form the form fit. The

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This minimizes the number of components required. The installation effort is also comparatively low.

Alternatively, according to one embodiment of the invention

Main bearing arrangement provided that the at least one first

The form-fitting element is designed as a recess set back in the axial direction compared to the end face of the outer ring and the at least one second form-fitting element is designed as a recess set back in the axial direction compared to the end face of the component or the flange, the circumferential direction of the

Outer rings effective positive connection via at least one

Connecting element is effected, which positively engages both in the recess in the outer ring and in the recess in the component or flange. At this

Embodiment are both form-fitting elements as compared to the respective

Front surface recessed recesses formed. The form-fitting

Connection is only effected by an additional connecting element. Two associated first and second form-fitting elements form one

Receiving space from, in which a connecting element can be used in such a way that between the outer ring and counter-element effective in the circumferential direction form-fitting connection is formed. The connecting element can after a

Embodiment of the invention can be designed as a feather key, which fits positively both into the recesses of the outer ring and into the recesses of the

Counter element engages.

According to one embodiment of the main bearing arrangement according to the invention, it is provided that the connecting element is secured against falling out in the radial direction. The securing can take place in that the connecting element is connected to the outer ring or the counter-element or to both components at the same time. The connection can be realized e.g. by screwing or materially by welding, soldering or gluing. Also can

Connection element e.g. positively and non-positively in the recesses in the outer ring zo and in the counter-element. For example, the connecting element can be wedge-shaped in the radial direction and pressed into the recesses, which are also wedge-shaped or V-shaped in the radial direction. Through this

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Measures can be taken to prevent the form fit from being lost and the associated connection no longer being able to transmit any forces in the circumferential direction.

In order to also counteract ring migration in the axial direction of the connecting construction and to prevent such axial ring migration, after a

Embodiment of the main bearing assembly according to the invention provided that the

outer ring is secured against movement relative to the adjacent structure in the axial direction by at least one detachable connection such as a screw connection.

The detachable connection can be formed, for example, between the outer ring and the counter-element. The releasable connection can be arranged, for example, in the peripheral areas between the first and the second interlocking elements. One or more detachable connections can be provided.

According to one embodiment of the main bearing arrangement according to the invention, it is provided that the outer ring is a bearing ring made of heat-treated steel with one or more inductively surface-hardened rolling element raceways. At this

In this embodiment, the first form-fitting elements can be introduced into the outer ring simply and without great manufacturing effort, because the areas of the outer ring that do not belong to the surface layer-hardened raceway area are not hardened and can therefore be easily machined, e.g. machined, in order to introduce the first form-fitting elements. In principle, the realization of the present one would be possible

The invention also applies to through-hardened or case-hardened outer rings made, for example, from the material 100Cr6 or case-hardened steel, although that would be the case then

Introducing the form-fitting elements into the hardened outer ring is significantly more complex.

According to one embodiment of the main bearing arrangement according to the invention, it is provided that the roller bearing is set up to, during operation of the bearing in

to absorb forces acting in the axial direction, whereby the outer ring is

Forces acting in the axial direction are pressed in the direction of the counter-element in such a way that the at least one first form-locking element is pressed in the direction of the at least one zo second form-locking element. This achieves the advantage that the flow of forces through the roller bearing supports the positive connection. The

During operation of the roller bearing, the outer ring is always pressed towards the counter element by the axial forces acting on it, i.e. always towards the

positive connection. As a result, the form fit cannot be lost, even if no mechanical safety measures have been taken to avoid loss of the form fit. In this embodiment, the forces acting on the roller bearing during operation thus ensure the form fit between the outer ring and counter-element acting in the circumferential direction. According to a

Embodiment of this main bearing arrangement according to the invention, the roller bearing can be designed as an employed tapered roller bearing.

According to one embodiment of the main bearing arrangement according to the invention it is provided that an inner ring of the roller bearing on at least one axial

Face has at least a third form-fitting element, with a with the

Rotor rotatably connected second counter-element is provided, which has at least a fourth form-fitting element, and wherein between the third and the fourth form-fitting element in the circumferential direction of the inner ring

Effective positive connection is formed. In this embodiment, therefore, both on the outer ring and on the inner ring of the rolling bearing in

Circumferentially effective positive connections provided by a

Ring migration of both the outer ring and the inner ring is effectively prevented.

The damage mechanisms described above, which can occur as a result of ring migration, are prevented in this way according to the invention in relation to both bearing rings.

The invention is explained in more detail below with reference to the figures. It show each schematically

Fig. 1 shows an outer ring according to a first embodiment of the invention with first

form-fitting elements,

Fig. 2 an embodiment of the invention with one in an annular receptacle

Connection construction mounted roller bearing outer ring,

Fig. 3 shows an embodiment of the invention in which both the outer ring and the

inner ring of the roller bearing are secured against ring migration in the circumferential direction, zo Fig. 4 an embodiment of the positive connection according to the invention,

FIG. 5 shows an alternative embodiment of FIG. 4 according to the invention

positive connection,

6 shows an alternative embodiment of the invention to FIGS. 4 and 5

positive connection.

1 shows an outer ring 3 of a large roller bearing in a perspective view.

The other components of the rolling bearing 2, so in particular the inner ring and between

The rolling elements arranged on the outer ring 3 and the inner ring are not shown in FIG.

The outer ring 3 has an axial end face 6 and a radial outer circumferential face 4 . The outer ring 3 also has first form-fitting elements 7 which protrude from the axial end face 6 . In the assembled state, the outer ring 3 is received with its radial outer peripheral surface 4 in an annular receptacle A (cf. FIG. 2 ) by means of a press fit. The receptacle A, not shown in FIG. 1, is firmly connected to the connecting structure.

Fig. 2 shows an embodiment of the invention with an outer ring 3, which is held in the annular receptacle A via a press fit in a rotationally fixed manner. The recording

A is non-rotatably connected to a connecting structure, not shown. The

Recording A has a counter-element 8, which in the illustrated embodiment as a

Flange 12 is formed. In the exemplary embodiment shown, the flange 12 is an integral, one-piece component of the receptacle A.

The outer ring 3 has an axial end face 6 which faces the counter-element 8 . The counter-element 8 or the flange 12 has an axial end face 14 facing the end face 6 . First positive-locking elements 7 are formed on the axial end face 6 of the outer ring 3, which are connected to the end face 14 of the

Counter element 8 trained second form-fitting elements 9 a form-fitting

Form compound 10, which is effective in the circumferential direction.

The axial forces occurring during operation of the bearing support the positive locking of the

Form-fit connections 10. The roller bearing 2 is set up to operate the

Bearing absorb forces acting in the axial direction. The force 25 acting on the outer ring 3 from the rolling bodies 23 has a force component 26 acting in the axial direction, through which the outer ring 3 moves in the direction of the counter-element

8 is pressed. As a result, the end face 6 of the outer ring 3 is in operation

Main bearing assembly by the forces acting on the outer ring 3 against the

Face 14 of the flange 12 pressed. This is indicated in FIG. 2 by the arrow 27 indicating the reaction force. The form-fitting elements 7, 9 can on this

way not to lose their form-fitting engagement. The occurring in the company on the

Outer ring 3 acting forces prevent in this way that the

Remove connection partners of the form-fitting connections 10 in the axial direction from each other and the form-fitting is lost without a separate

Preload force must be applied. In particular, no separate

Prestressing elements required, through which the outer ring 3 is prestressed against the flange 12.

3 shows an embodiment of the invention in which both the outer ring 3 and the inner ring 22 of the roller bearing 2 are secured against ring migration in the circumferential direction. The inner ring 22 has, on at least its axial end face 28 , a plurality of third positive-locking elements 29 arranged distributed over the circumference. The rotatably connected to the rotor 1 second counter-element 30 has a plurality of over the

Scope distributed arranged fourth positive-locking elements 31 on. Between the third 29 and the fourth form-fitting elements 31 are in the circumferential direction of the

Outer ring 22 effective positive connection 32 formed.

The forces occurring during operation, acting on the inner ring 22 support the

Positive locking of the positive locking connections 32. The roller bearing 2 is set up to absorb forces acting in the axial direction during operation of the bearing. The ones from the

Rolling elements 23 acting on the inner ring 22 force 33 has a force component 34 acting in the axial direction, through which the outer ring 22 in the direction of the second

Counter element 30 is pressed. As a result, the end face 28 of the inner ring 22 in

Operation of the main bearing arrangement is pressed by the forces acting on the inner ring 22 against the end face 35 of the second counter-element 30 facing the end face 28 . This is indicated by the arrow 36 in FIG. In this way, the positive-locking elements 29, 31 cannot lose their form-locking engagement. In this way, the forces occurring during operation zo and acting on the inner ring 22 prevent the connection partners of the form-fitting connections 32 from moving away from one another in the axial direction and the form-fitting being lost, without a separate connection being required for this purpose

Preload force must be applied. In particular, no separate

Biasing elements required, through which the inner ring 22 against the second

Counter element 30 is biased.

In the exemplary embodiment illustrated in FIG. 3 , the second counter-element 30 is designed as a flange 38 which is integral with the rotor 1 .

The outer ring 3 and the receptacle A accommodating the outer ring 3 in the exemplary embodiment shown in FIG. 3 are analogous to that shown in FIG

Executed embodiment. Recording A is analogous to that shown in FIG

Embodiment designed as a ring-shaped component, which is non-rotatably connected to elements of the connecting structure, not shown in FIG. The

Connection construction can e.g. be part of a housing of the nacelle

be a wind turbine.

It is understood that within the scope of the conceivable embodiments of the invention all

Form-fitting elements 7, 9, 29, 31 can be designed as projections and/or recesses. Alternatively, all form-fitting elements 7, 9, 29, 31 as

Recesses can be formed, in which then separate connecting elements such as feather keys are used to the effective in the circumferential direction

to form positive connections.

Fig. 4 shows an embodiment of the invention in which both the first

Interlocking elements 7 on the outer ring 3 and the second interlocking elements 9 on the counter-element 8/the flange 12 are designed as recesses. The

Positive connection is established via the connecting element 21 . In the illustrated embodiment, the connecting element 21 is designed as a feather key.

Fig. 5 shows an embodiment of the invention, in which the first form-fitting elements 7 on the outer ring 3 as recesses and the second form-fitting elements 9 on the

Counter element 8 / the flange 12 are formed as projections. The

Form-fitting connection is produced by the engagement of the projections in the recesses.

Fig. 6 shows an embodiment of the invention, in which the first form-fitting elements zo 7 on the outer ring 3 as projections and the second form-fitting elements 9 on the

Counter element 8 / the flange 12 are formed as recesses. The

Form-fitting connection is produced by the engagement of the projections in the recesses.

LIST OF REFERENCE NUMERALS 1 Rotor 2 Rolling bearing 3 Outer ring 4 Outer peripheral surface 5 Lateral surface 6 End face 7 Form-fitting element 8 Counter-element 0 9 Form-fitting element

Positive connection 11 Component 12 Flange 14 Front surface 15 Projection 16 Recess 17 Recess 18 Projection 19 Recess 20 Recess 21 Connecting element 22 Outer ring 23 Rolling element 24 Cage 25 Force 26 Force component 27 Arrow 28 Front surface 29 Form key element zo 30 — Counter element 31 Form closure element 32 Form closure connection 33 Force 34 Force component

35 face 36 arrow 37 component 38 flange

Claims (12)

Expectations 1. Main bearing arrangement for mounting a rotatable rotor (1) of a wind turbine, the rotor (1) being mounted rotatably relative to a connecting structure via at least one roller bearing (2), the roller bearing (2) having an outer ring (3) which, via its radial outer peripheral surface (4) is connected to an annular receptacle (A) of the connecting structure via a press fit, characterized in that the outer ring (3) has at least one first positive-locking element (7) on at least one axial end face (6), with a counter-element (8) connected non-rotatably to the adjacent construction, which has at least one second positive-locking element (9), and wherein a positive-locking connection (10) effective in the circumferential direction of the outer ring (3) is formed between the first (7) and the second positive-locking element (9). . 2. Main bearing arrangement according to claim 1, characterized in that a plurality of first and second form-fitting elements (7, 9) are distributed over the circumference, the circumferential sections between adjacent form-fitting elements (7, 9) preferably being of the same length. 3. Main bearing arrangement according to Claim 1 or 2, characterized in that the counter-element (8) is a component (11) connected in a torque-proof manner to the connecting structure or a flange (12) integrally formed on the connecting structure, the at least one second positive-locking element (9) is formed on an axial end face (14) of the component (11) or the flange (12), which faces the axial end face (6) of the outer ring (3) with the at least one first positive-locking element (7). 4. Main bearing arrangement according to one of the preceding claims, characterized in that the at least one first form-fitting element (7) is a projection (15) protruding in the axial direction relative to the end face (6) of the outer ring (3) and the at least one second form-fitting element (9) is a recess (16) set back in the axial direction relative to the end face (14) of the component (11) or the flange (12), or that the at least one first positive-locking element (7) is designed as a recess (16) in the axial direction relative to the front face (6) of the outer ring (3 ) set-back recess (17) and the at least one second positive-locking element (9) is designed as a projection (18) projecting in the axial direction relative to the end face (14) of the component (11) or the flange (12), the projection (15; 18 ) engages in the recess (16; 17) to form the positive connection (10) effective in the circumferential direction. 5. Main bearing arrangement according to one of Claims 1 to 3, characterized in that the at least one first form-fitting element (7) is designed as a recess (19) set back in the axial direction in relation to the end face (6) of the outer ring (3) and the at least one second form-fitting element (9 ) is designed as a recess (20) set back in the axial direction relative to the end face (14) of the component (11) or the flange (12), the form-fitting connection (10) effective in the circumferential direction of the outer ring (3) being connected via at least one connecting element (21) is effected, which positively engages both in the recess (19) in the outer ring (3) and in the recess (20) in the component (11) or flange (12). 6. Main bearing arrangement according to claim 5, characterized in that the at least one connecting element (21) is designed as a feather key. 7. Main bearing arrangement according to one of claims 5 to 6, characterized in that the connecting element (21) is secured against falling out in the radial direction. zo 8. Main bearing arrangement according to one of the preceding claims, characterized in that that the outer ring (3) is secured against movement relative to the adjacent structure in the axial direction by at least one detachable connection, e.g. a screw connection. 9. Main bearing arrangement according to one of the preceding claims, characterized in that the outer ring (3) is a bearing ring made of heat-treated steel with one or more inductively surface-hardened rolling element raceways. 10. Main bearing arrangement according to one of the preceding claims, characterized in that the roller bearing (2) is set up to absorb forces acting in the axial direction during operation of the bearing, the outer ring (3) being displaced in the direction of the Counter element (8) is pressed in that the at least one first form-fitting element (7) is pressed in the direction of the at least one second form-fitting element (9). 11. Main bearing arrangement according to claim 10, characterized in that the roller bearing (2) is designed as an employed tapered roller bearing. 12. Main bearing arrangement according to one of the preceding claims, characterized in that an inner ring (22) of the roller bearing (2) has at least one third positive-locking element (29) on at least one axial end face (28), with a non-rotatably connected to the rotor (1). second counter-element (30) is provided, which has at least a fourth positive-locking element (31), and wherein between the third (29) and the fourth positive-locking element (31) there is a positive-locking connection (32) effective in the circumferential direction of the inner ring (22).