Folded sun shaft with sealing arrangement

Abstract

The invention relates to an arrangement with a hollow sun shaft (101), a sun gear, which is connected to the sun shaft (101) in a rotationally fixed manner, and a hollow hub (103), a pitch tube (111) and a sealing arrangement (113, 115, 117, 119, 121, 201). The arrangement also comprises a hollow shaft (105), which is non-rotatably connected to the sun shaft (101) at a first connection point (107) and non-rotatably connected to the hub (103) at a second connection point (109); wherein the second connection point (109) is arranged axially offset from the first connection point (107) in the direction of the sun gear; wherein the pitch tube (111) extends through the sun shaft (101); and wherein the sealing arrangement (113, 115, 117, 119, 121, 201) is arranged in a gap between the pitch tube (111) and the sun shaft (101) and seals the pitch tube (111) and the sun shaft (101) against each other.

Description

[0001] Folded sun shaft with sealing arrangement

[0002] The invention relates to an arrangement according to the preamble of claim 1, a wind turbine gearbox according to claim 13, a use according to claim 15 and a method according to the preamble of claim 16.

[0003] Wind turbines with integrated drive trains are known from the prior art. For example, US 2010 329 867 A2 discloses an integrated drive train. The rotor of a generator is fixed to a hub, which is part of a gearbox. The hub is connected to a sun shaft via splines.

[0004] The invention is based on the object of making available a drive train that is improved compared to the prior art.

[0005] This object is achieved by an arrangement according to claim 1, a wind turbine gearbox according to claim 13, a use according to claim 15 and a method according to claim 16. Preferred developments are contained in the subclaims and result from the following description and the figures.

[0006] The arrangement according to the invention comprises a hollow sun shaft, i.e. a sun gear, a hub, a pitch tube and a sealing arrangement.

[0007] A sun gear is a spur gear designed for use as part of a planetary stage. The planetary stage also includes a ring gear, one or more planet gears, and a planet carrier. The planet gears are rotatably mounted in the planet carrier and mesh with the ring gear and / or the sun gear. Preferably, exactly two of the three gear elements—ring gear, planet carrier, and sun gear—are rotatably mounted, while the third gear element is fixed to the housing. In particular, the sun gear and the planet carrier can be rotatably mounted, and the ring gear can be fixed to the housing. In this case, the sun gear is connected to the sun shaft in a rotationally fixed manner, i.e., without the possibility of relative rotation. In particular, the sun gear can be connected to the sun shaft in one piece, or can be joined to it by a force-fitting, form-fitting, and / or material fit.

[0008] According to the technical understanding, a hub refers to a means that is connected or connectable to a shaft, axle, or journal. In this case, the hub is connected to a hollow shaft. In this case, the hub is hollow. It therefore has a cavity within it. This cavity preferably extends over the entire axial length of the hub, terminating in the end faces of the hub. The cavity extends radially inward to a rotational axis of the hub. The rotational axis therefore runs through the cavity or intersects it.

[0009] The hub is preferably rotatably mounted in a housing of the transmission or a structure fixed to the housing, i.e., a structure that is rigidly fixed in the housing, i.e., without the possibility of relative movement. This means that the hub is, on the one hand, rotatable relative to the housing and, on the other hand, is supported in the housing via one or more bearings. Preferably, the hub is supported exclusively via this position in the housing or the structure fixed to the housing.

[0010] A pitch pipe is a pipe used to carry electrical and / or hydraulic supply and control lines. In particular, these can be supply and / or control lines for the pitch control of a wind turbine.

[0011] According to the invention, the arrangement further comprises a hollow shaft. The hollow shaft is connected to the sun shaft in a first connection point in a rotationally fixed manner. At a second connection point, it is connected to the hub in a rotationally fixed manner.

[0012] The term connection point refers to a location in which a force-fitting, form-fitting and / or material-fitting joint is formed between two connection partners, in this case between the hollow shaft and the sun shaft or between the hollow shaft and the hub.

[0013] The joints at the first and second connection points are each torsionally rigid. This creates a rotationally rigid connection between the sun gear and the hollow shaft via the first connection point. A rotationally rigid connection between the hollow shaft and the hub exists via the second connection point. Consequently, the sun gear and the hub are also rotationally rigid. This allows a torque flow to be transmitted from the sun gear via the sun gear and the hollow shaft to the hub, or a torque flow in the opposite direction from the hub via the hollow shaft and the sun gear to the sun gear.

[0014] The invention provides that the second connection point is arranged axially offset from the first connection point, i.e., parallel to a rotational axis of the sun gear, the sun shaft, the hollow shaft, and the hub, in the direction of the sun gear. Thus, there is an axial offset between the two connection points.

[0015] The axial offset is limited by the planetary stage to which the sun gear belongs. Accordingly, the second connection point is preferably arranged axially offset from the sun gear toward the first connection point. The second connection point is then located axially between the sun gear and the first connection point.

[0016] The axially offset arrangement of the two connection points results in a folding of the torque flow described above. At the first connection point, its direction is reversed. Compared to a direct course of the torque flow between the sun gear and the hub, the folding increases the distance the torque has to travel on its way between the sun shaft and the hub. As a result, the torsional rigidity is reduced. The reduced torsional rigidity improves the vibration behavior of the arrangement. In particular, noise emissions resulting from the transmission of torsional vibrations from the planetary stage to the hub are reduced. Since the reduction in torsional rigidity is achieved by folding the torque flow, the original load-bearing capacity of the torque-transmitting connection between the sun gear and the hub is retained.

[0017] The pitch tube runs through the sun shaft. This means that the pitch tube runs through the aforementioned cavity of the sun shaft. It extends from one opening of the cavity in one end of the sun shaft to the other opening of the cavity in another end of the sun shaft. Both end faces of the pitch tube are located outside the sun shaft. In particular, a middle section of the pitch tube can be located inside the cavity, while two end sections of the pitch tube on opposite sides of the sun shaft are located outside the cavity. The pitch tube runs through the sun shaft if and only if every axial plane that intersects the sun shaft also intersects the pitch tube.

[0018] A gap extends between the pitch tube and the sun shaft. To prevent transmission oil from escaping through this gap, the sealing assembly is located in the gap and seals the pitch tube and the sun shaft from each other. This means that the sealing assembly forms a lubricant-tight barrier between the pitch tube and the sun shaft.

[0019] Preferably, the sun shaft runs through the hollow shaft. Both front ends of the sun shaft are then located outside the hollow shaft. A section of the sun shaft is arranged inside the hollow shaft, i.e. in a cavity enclosed by the hollow shaft. When the sun shaft runs through the hollow shaft, the sun shaft and the hollow shaft are nested within each other, thus resulting in the folding of the torque flow described above. In a preferred embodiment, the first connection point is arranged on a first front side of the hollow shaft. The hollow shaft then extends from the first connection point towards the sun gear. The arrangement of the first connection point according to the embodiment is advantageous because it makes the first connection point particularly easy to access for assembly and disassembly purposes.

[0020] This makes it possible, for example, to design the first connection point as a screw flange. The screw flange consists of a first flange and a second flange, which are preferably screwed together. In particular, the sun shaft can have the first flange and the hollow shaft the second flange.

[0021] In order to enable particularly good accessibility of the second connection point for assembly and disassembly purposes, in a preferred development said second connection point is arranged on a second end face of the hollow shaft opposite the first end face and / or on an end face of the hub.

[0022] Even with a front-end arrangement of the second connection point, according to a further preferred development, the second connection point can be implemented as a flange connection. This flange connection is formed by a third flange and a fourth flange, which are preferably screwed together. The hollow shaft has the third flange, and the hub has the fourth flange.

[0023] The sealing arrangement can consist of one or more seals. In a preferred embodiment, however, the sealing arrangement comprises a seal carrier in addition to a first seal and a second seal. The seal carrier is made of a solid material suitable for accommodating the first seal and the second seal. The seal carrier can be made of metal or a non-elastomeric plastic, i.e., a thermoplastic or a thermoset. The first seal seals the pitch tube and the seal carrier from one another. The first seal is preferably arranged in a gap running between the pitch tube and the seal carrier and closes this gap in a lubricant-tight manner.

[0024] The second seal seals the seal carrier and the sun shaft from each other. For this purpose, the second seal is preferably located in a gap between the seal carrier and the sun shaft, sealing it with a lubricant-tight seal.

[0025] Preferably, the first seal and / or the second seal are fixed in the seal carrier. A lubricant-tight joint exists between the first seal and the seal carrier and / or between the second seal and the seal carrier. The joints can, in particular, be rotationally fixed. In this case, the first seal and / or the second seal are rotationally fixed in the seal carrier.

[0026] Preferably, the sealing arrangement is further developed with a third seal and a fourth seal. The third seal is arranged in series with the first seal. This means that the third seal also seals the pitch tube and the seal carrier from each other.

[0027] The fourth seal is arranged in series with the second seal. Accordingly, the fourth seal seals the seal carrier and the sun shaft against each other. Like the first seal and the second seal, the third seal and the fourth seal can also be fixed in the seal carrier.

[0028] The third seal and the fourth seal form an additional lubricant barrier that prevents lubricant from leaking in the event of failure of the first seal or the second seal.

[0029] If the first seal fails, lubricant enters a cavity between the first seal and the third seal. This cavity is formed by the first seal, the third seal, the seal carrier, and the pitch tube. If the second seal fails, lubricant enters a cavity between the second seal and the fourth seal. This cavity is formed by the second seal, the fourth seal, the lubricant carrier, and the sun shaft. These cavities serve to collect the lubricant and prevent it from escaping into the environment.

[0030] The collected lubricant must be drained away to maintain the described function of the cavities. For this purpose, the seal carrier has at least one lubricant line. This opens on one side into the cavity between the first seal and the third seal, and on the other side into the cavity between the second seal and the fourth seal. Lubricant that has entered one of the cavities due to a failure of the first seal or the second seal can flow into the other cavity via the lubricant line of the seal carrier.

[0031] Due to the resulting centrifugal forces, the lubricant flows radially outward. Lubricant that has entered the cavity between the first seal and the third seal in the event of a failure of the first seal therefore flows through the lubricant line of the seal carrier into the cavity between the second seal and the fourth seal. To drain the lubricant from this cavity, in a preferred embodiment, the sun shaft also has at least one lubricant line. This opens into the cavity between the second seal and the fourth seal. Lubricant that has entered this cavity flows through the lubricant line of the sun shaft due to the resulting centrifugal forces.

[0032] In a preferred development, the seal carrier is arranged at least partially within the hub. Particular preference is given to arranging the at least one lubricant line of the seal carrier and / or the at least one lubricant line of the sun shaft within the hub. This makes it possible to further discharge the lubricant discharged via the at least one lubricant line of the sun shaft via the hub. In a corresponding preferred development, the at least one lubricant line of the sun shaft opens into a cavity between a fifth seal and a sixth seal. The fifth seal and the sixth seal each seal the sun shaft and the hub from one another. The cavity is formed by the fifth seal, the sixth seal, the sun shaft and the hub. The lubricant discharged via the at least one lubricant line of the sun shaft collects in this cavity.The lubricant can then be drained via at least one lubricant line formed by the hub, which opens into the cavity between the fifth seal and the sixth seal.

[0033] In a preferred embodiment, the seal carrier is connected to the sun shaft in a rotationally fixed manner. In particular, the seal carrier can be fixed in the sun shaft in a force-fitting, form-fitting, and / or material-fitting manner.

[0034] In a preferred embodiment, a corresponding connection point, at which the seal carrier is connected to the sun shaft in a rotationally fixed manner, is arranged on a first end face of the sun shaft. The sun gear is arranged on a second end face of the sun shaft. This means that the third connection point and the sun gear are located on opposite end faces of the sun shaft.

[0035] It is advantageous if the aforementioned seals and the third connection point are axially spaced from each other. This allows the seal carrier with the seals to be inserted into the interior of the sun shaft. Due to the axial spacing, the third connection point remains accessible from the outside for assembly and maintenance purposes.

[0036] In a preferred embodiment, the axial spacing between the seals and the third connection point is achieved by means of a hollow cylindrical section of the seal carrier. This section extends between the third seal and the third connection point. The hollow cylindrical section thus connects a part of the seal carrier, which accommodates the third seal, to the third connection point.

[0037] Preferably, the arrangement is further developed with a ring and one or more bolts. These, together with a flange, form the third connection point. The flange is part of the seal carrier and has one or more through holes for accommodating the one or more bolts.

[0038] The sun shaft forms a first axial contact surface for the flange. One or more bores in the sun shaft open into the first axial contact surface. The sun shaft also has at least one groove. This groove serves to accommodate the ring. The ring engages in the groove, i.e., it is at least partially located in the groove and is thus positively secured by the groove. It forms a second axial contact surface for the flange.

[0039] The flange engages in an axial gap between the first axial contact surface and the second axial contact surface. At least a portion of the flange thus extends between the first axial contact surface and the second axial contact surface. The axial contact surfaces each form an axial abutment for the flange. They limit the axial mobility of the flange in one axial direction relative to the sun shaft.

[0040] To secure the seal carrier in the sun shaft for rotation, the bolts engage in a through-hole in the flange and a hole in the sun shaft. One part of each bolt is then located in a through-hole in the flange, while another part of the bolt is located in a hole in the sun shaft that is aligned with the through-hole in the flange.

[0041] The advanced fixation of the seal carrier in the sun shaft is advantageous in terms of the available installation space. If the sun shaft protrudes into the installation space of a generator, the available installation space is limited. Fixing the seal carrier in the sun shaft using a conventional screw flange would therefore leave little room for the folding described above. The bolts, on the other hand, require very little installation space and are nevertheless sufficiently robust.

[0042] To prevent the bolts from falling out, a preferred embodiment of the ring at least partially covers one or more through holes. This is advantageous because no additional components are required.

[0043] The arrangement is preferably developed as a wind turbine gearbox. Wind turbine gearboxes are characterized, among other things, by particularly high torque loads. For example, a gearbox input shaft can be loaded with more than 3,000 kNm, 5,000 kNm, or 10,000 kNm during operation. Against this background, a further development as a wind turbine gearbox seems surprising, since reduced torsional rigidity usually goes hand in hand with reduced torque load capacity. However, the original load capacity of a wind turbine gearbox with this further development is maintained by convolution of the torque flow. The sealing arrangement described above continues to ensure protection against lubricant leakage. At the same time, difficulties during assembly are avoided.

[0044] The first connection point, and preferably also the second connection point, is arranged on the generator side, or offset in the wind direction, from the sun gear. Conversely, the second connection point is preferably arranged on the rotor side, or offset against the wind direction, from the first connection point.

[0045] In the wind turbine gearbox according to the invention, the hub is preferably designed as a generator hub. This means that the hub is connected or connectable to a rotor of a generator of a wind turbine according to the invention. This is particularly advantageous because there is free space within the generator for the above-described folding of the torque flow, which would otherwise remain unused. The use of the wind turbine gearbox according to the invention serves to reduce the noise emissions of a wind turbine, in particular to reduce noise emissions due to torsional vibrations transmitted between the generator and the gearbox.

[0046] A method according to the invention is used for assembling the above-described assembly or wind turbine gearbox. The method provides for first assembling the pitch tube and / or the sun shaft. Subsequently, the sealing assembly is installed.

[0047] In particular, the sealing arrangement can be installed after the pitch tube and sun shaft have been assembled. Once the pitch tube and sun shaft are assembled, a gap runs between the pitch tube and the sun shaft. The sealing arrangement must be inserted into this gap. A corresponding method step is provided in a preferred development of the method. The sealing arrangement can be inserted into the gap, in particular, from an end face of the sun shaft opposite the sun gear. The sealing arrangement is then inserted into the gap in the direction of the sun gear.

[0048] A preferred embodiment of the invention is illustrated in the figures. In detail:

[0049] Fig. 1 shows a nested shaft arrangement with a seal carrier; and

[0050] Fig. 2 a detailed view of a connection point of the seal carrier.

[0051] The shaft arrangement shown in Fig. 1 comprises a sun shaft 101 and a hub 103. The sun shaft 101 extends from a sun gear arranged on the transmission side with respect to the hub 103 through the hub 103 into a cavity on the generator side with respect to the hub 103.

[0052] The sun shaft 101 is connected to the hub 103 via a hollow shaft 105. The hollow shaft 105 is connected to the sun shaft 101 in a first flange connection 107. It is connected to the hub 103 in a second flange connection 109.

[0053] The first flange connection 107 is located at the generator-side end of the sun gear shaft 101. From there, the second flange connection 109 is offset on the transmission side. This results in a folding of the torque-conducting connection from the sun gear to the hub 103.

[0054] A pitch tube 111 extends through the sun shaft 101. Electrical and hydraulic supply lines for a pitch drive are laid inside the pitch tube 111.

[0055] A gap runs between the pitch tube 111 and the sun shaft 101. To prevent lubricant from escaping from the transmission through this gap, a sealing arrangement is provided, which includes a seal carrier 113, a first radial seal 115, a second radial seal 117, a first seal 119, a second seal 121, a third seal 123, a fourth seal 125, and a fifth seal 127.

[0056] The first radial seal 115 and the second radial seal 117 are fixed in the seal carrier 113 in a fluid-tight manner. One or more sealing lips of the first radial seal 115 and one or more sealing lips of the second radial seal 117 are radially clamped against the pitch tube 111, so that no lubricant can pass between the first radial seal 115 and the second radial seal 117 and the pitch tube 111.

[0057] The first seal 119 and the second seal 121 serve to seal the seal carrier 113 against the sun shaft. Both sealing rings 119, 121 are clamped radially between the seal carrier 111 and the sun shaft 101.

[0058] The first radial seal 115, the second radial seal 117, the pitch tube 111, and the sun shaft 101 enclose a cavity. Lubricant collects in the cavity if the first radial seal 115 leaks. To drain the lubricant from the cavity, the lubricant carrier 113 has bores 131. These bores connect the cavity in a lubricant-conducting manner to another cavity formed by the first seal 119, the second seal 121, the seal carrier 113, and the sun shaft 101. In the latter cavity, the lubricant flows out due to rotation-induced centrifugal forces.

[0059] Bores 133 of the sun shaft 101 open into the latter cavity. The bores 133 also open into a further cavity formed by the fourth seal 125, the fifth seal 127, the sun shaft 101 and the hub 103.

[0060] The lubricant flows into this cavity through the holes 133 due to rotation-induced centrifugal forces.

[0061] Further holes 135 are located in the hub 103. These holes 135 open into the cavity formed by the fourth seal 125, the fifth seal 127, the sun shaft 101, and the hub 103. They serve to drain the lubricant into the interior of the transmission.

[0062] To prevent lubricant from accumulating in front of the first radial seal 115, the sun shaft 101 has additional bores 137. These bores open from the first radial seal 115 on the gearbox side into the gap between the pitch tube 111 and the sun shaft 101. The lubricant is drained through the bores 137 into a cavity formed by the third seal 123, the fourth seal 125, the sun shaft 101, and the hub 103. From there, the lubricant flows back into the gearbox interior through bores in the hub 103.

[0063] The seal carrier 113 is connected to the sun shaft 101 in a connection point 139 in a rotationally fixed manner. Since the sun shaft 101 rotates at a different speed than the pitch tube 111, the seal carrier 113 also rotates at a different speed than the pitch tube 111. To seal the seal carrier 113 from the pitch tube 111, the radial seals 115, 117 are used instead of simple sealing rings. Fig. 2 shows the structure of the connection point 139 in detail. The seal carrier 113 forms a flange 201 on the generator side. This flange runs between a shoulder 203 of the sun shaft 101 and a ring 205. The ring 205 is embedded in a corresponding groove 207 in the sun shaft 101. Together with the shoulder 203, the ring 205 forms axial abutments which determine the axial position of the flange 201 and thus of the seal carrier 113 in the sun shaft 101.

[0064] The seal carrier 113 is fixed in the sun shaft 101 in a rotationally fixed manner by means of several bolts 209. These bolts are each inserted into a blind hole 211 of the sun shaft 101 and a through hole 213 of the flange 201 that is aligned therewith.

[0065] The through holes 213 are covered on the generator side by the ring 205. This prevents the bolts 209 from getting lost.

[0066] A support 215 is bolted to the seal carrier 113. The support 215 has a central recess through which the pitch tube 111 passes. The support 215 serves to radially support the pitch tube 111 during assembly. During operation, a gap exists between the pitch tube 111 and the support 215.

[0067] Reference symbol

[0068] Sunwave

[0069] hub

[0070] hollow shaft

[0071] flange connection

[0072] flange connection

[0073] Pitch pipe

[0074] Seal carrier

[0075] Radial seal

[0076] Radial seal

[0077] sealing ring

[0078] sealing ring

[0079] sealing ring

[0080] sealing ring

[0081] sealing ring

[0082] drilling

[0083] drilling

[0084] drilling

[0085] drilling

[0086] liaison office

[0087] flange

[0088] Paragraph

[0089] ring

[0090] Nut

[0091] bolt

[0092] Blind hole drilling

[0093] Through hole

[0094] Support ring

Claims

Patent claims 1. An arrangement comprising a hollow sun shaft (101), a sun gear which is rotationally connected to the sun shaft (101), and a hollow hub (103), a pitch tube (111), and a sealing arrangement (113, 115, 117, 119, 121, 201); characterized by a hollow shaft (105) which is rotationally connected to the sun shaft (101) at a first connection point (107) and to the hub (103) at a second connection point (109); wherein the second connection point (109) is arranged offset axially in the direction of the sun gear from the first connection point (107); wherein the pitch tube (111) extends through the sun shaft (101); and wherein the sealing arrangement (113, 115, 117, 119, 121, 201) is arranged in a gap between the pitch tube (111) and the sun shaft (101) and seals the pitch tube (111) and the sun shaft (101) against each other.

2. Arrangement according to claim 1; characterized in that the first connection point (107) is arranged on a first end face of the hollow shaft (105).

3. Arrangement according to the preceding claim; characterized in that the second connection point (109) is arranged on a second end face of the hollow shaft (105) and / or on an end face of the hub (103).

4. Arrangement according to one of the preceding claims; characterized in that the sealing arrangement (113, 115, 117, 119, 121, 201) comprises a seal carrier (113), a first seal (115) and a second seal (119); wherein the first seal (115) seals the pitch tube (111) and the seal carrier (113) from one another; and wherein the second seal (119) seals the seal carrier (111) and the sun shaft (101) from one another.

5. Arrangement according to the preceding claim; characterized in that the sealing arrangement (113, 115, 117, 119, 121, 201) has a third seal (117) and a fourth seal (121); wherein the third seal (117) seals the pitch tube (111) and the seal carrier (113) from one another; and wherein the fourth seal (121) seals the seal carrier (113) and the sun shaft (101) from one another; wherein the seal carrier (113) has at least one lubricant line (131) which opens into a cavity between the first seal (115) and the third seal (117) and into a cavity between the second seal (119) and the fourth seal (121).

6. Arrangement according to the preceding claim; characterized in that the sun shaft (101) has at least one lubricant line (133) which opens into the cavity between the second seal (119) and the fourth seal (121).

7. Arrangement according to one of the preceding claims; characterized in that the seal carrier (113) is arranged at least partially within the hub (103).

8. Arrangement according to the preceding claim with reference to claim 6; characterized by a fifth seal (125) and a sixth seal (127), each sealing the sun shaft (101) and the hub (103) from one another; wherein the at least one lubricant line (133) of the sun shaft (101) opens into a cavity between the fifth seal (125) and the sixth seal (127).

9. Arrangement according to one of claims 4 to 8; characterized in that the seal carrier (113) is fixed in the sun shaft (101) in a rotationally fixed manner.

10. Arrangement according to the preceding claim; characterized in that the seal carrier (113) is rotationally connected to the sun shaft (101) at a third connection point (139); wherein the third connection point (139) is arranged on a first end face of the sun shaft (101); and wherein the sun gear is arranged on a second end face of the sun shaft (101).

11. Arrangement according to the preceding claim; characterized in that the seal carrier (113) comprises a hollow cylindrical section extending between the third seal (117) and the third connection point (139).

12. Arrangement according to one of claims 10 or 11; characterized by a ring (205) and one or more bolts (209); wherein the seal carrier (113) has a flange (201) with one or more through-bores (213); wherein the sun shaft (101) has a first axial bearing surface (203) for the flange (201), one or more bores (211) opening into the bearing surface and at least one groove (207); wherein the ring (205) engages in the groove (207) and forms a second axial bearing surface for the flange (201); wherein the bolts (209) each engage in a through-bore (213) of the flange (201) and a bore (211) of the sun shaft (101).

13. Arrangement according to the preceding claim; characterized in that the ring (205) at least partially covers the one or more through-bores (213).

14. Wind turbine gearbox with an arrangement according to one of the preceding claims.

15. Wind turbine gearbox according to the preceding claim; characterized in that the hub (103) is designed as a generator hub.

16. Use of a wind turbine gearbox according to one of claims 13 or 14 for reducing the noise emission of a wind turbine.

17. A method for assembling an arrangement according to one of claims 1 to 12 or a wind turbine gearbox according to one of claims 13 or 14; characterized in that the sealing arrangement (113, 115, 117, 119, 121, 201) is mounted after the assembly of the pitch tube (111) and / or the sun shaft (101).

18. Method according to the preceding claim; characterized in that the sealing arrangement (113, 115, 117, 119, 121, 201) is introduced into the gap extending between the pitch tube (111) and the sun shaft (101) after the assembly of the pitch tube (111) and the sun shaft (101).

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