Drive arrangement for wind turbine

Abstract

The invention relates to a drive arrangement for a wind turbine, comprising: a rotor shaft arrangement (103, 105), which consists of a rotor shaft (103) and a planet carrier (105), which is connected to the rotor shaft (103) in a rotationally fixed manner; a first bearing device (107); a second bearing arrangement (109); a housing arrangement (111, 115), which consists of a transmission housing (115) and one or more torque supports (111), which are fixed in the transmission housing (115) in a rotationally fixed manner; and a mechanism (201) fixed relative to the pod, the rotor shaft arrangement (103, 105) being mounted in the mechanism (201) fixed relative to the pod by means of a first bearing arrangement (107) and in the transmission housing (115) by means of a second bearing arrangement (109). The first bearing arrangement (107) is designed as a fixed bearing, and the one or more torque supports (111) are fixed in an axially movable manner in a mechanism (201) that is fixed relative to the pod.

Description

Technical Field

[0001] The invention relates to a drive device according to the preamble of claim 1 . Background Art

[0002] EP 2 067 990 A2 discloses a drive train for a wind turbine. The drive train comprises a rotor shaft, a planet carrier connected to the rotor shaft in a rotationally fixed manner, a rotor shaft bearing, a planet carrier bearing, a transmission housing, and a torque support connected to the transmission housing in a rotationally fixed manner. The rotor shaft is rotatably supported in a transmission pod by means of the rotor bearing. The torque support is also fixed in the transmission pod. A planet carrier bearing is mounted on the rotor side of the planet carrier. The planet carrier is rotatably supported in the transmission housing via this bearing. Summary of the Invention

[0003] The invention is based on the object of improving the drive train of a wind turbine. This object is achieved by a drive device according to claim 1. Preferred developments are apparent from the dependent claims and the following description.

[0004] The drive device is configured for use in a wind turbine. In a wind turbine, the drive device forms part of a drive train comprising all mechanisms involved in transmitting a torque flow from a rotor located in and driven by the wind to a generator of the wind turbine.

[0005] The driving device includes: a rotor shaft device; a first bearing device; a second bearing device; a housing device; and a mechanism fixed relative to the pod.

[0006] The rotor shaft arrangement consists of a rotor shaft and a planet carrier. The rotor shaft is a shaft that is or can be connected to the rotor in a rotationally fixed manner. The rotor shaft can be configured in particular to be coupled to the rotor or to be coupled to the rotor, for example, by means of a threaded flange.

[0007] The planet carrier is connected to the rotor shaft in a rotationally fixed manner. The connection can be designed as a single piece or multiple pieces. Preferably, the rotor shaft and the planet carrier are screwed together.

[0008] A bearing assembly is an arrangement comprising one or more bearings. A bearing in a bearing assembly is characterized by at least one bearing ring of each two adjacent bearings in the assembly contacting each other directly or via a washer (such as an intermediate ring). The at least two bearing rings of adjacent bearings may be integrally connected to each other, contacting each other, or contacting a washer. If a bearing ring of a particular bearing does not contact a bearing ring of a bearing in the bearing assembly directly or via a washer, then that bearing does not belong to the bearing assembly.

[0009] The housing arrangement comprises a transmission housing and one or more torque supports fixed in the transmission housing in a rotationally fixed manner. In particular, the torque supports can be fixed in the transmission housing rigidly, i.e., such that no relative movement between the transmission housing and the torque supports is possible. Preferably, the torque supports are integrally connected to the transmission housing or to a portion of the transmission housing, preferably to a wall of the transmission housing.

[0010] The device fixed relative to the nacelle is fixed or can be fixed in the nacelle rigidly, ie without relative movement between the device and the nacelle of the wind turbine. The device fixed relative to the nacelle can in particular be a machine support.

[0011] The rotor shaft assembly is supported in the structure fixed relative to the nacelle by means of a first bearing assembly. Preferably, the outer bearing ring of the first bearing assembly engages with the structure fixed relative to the nacelle or is integrally integrated therein. Correspondingly, the inner bearing ring of the first bearing assembly preferably engages with the rotor shaft assembly or is integrally integrated therein.

[0012] Preferably, the rotor shaft is supported in the mechanism fixed relative to the pod by means of a first bearing arrangement. In this case, the bearing inner ring of the first bearing arrangement is engaged with the rotor shaft or is integrally integrated into the rotor shaft.

[0013] The rotor shaft arrangement is supported in the transmission housing by means of the second bearing arrangement. This means that the rotor shaft arrangement and the transmission housing support each other via the second bearing arrangement.

[0014] Preferably, the outer bearing ring of the second bearing arrangement is engaged with the transmission housing or is integrated into the transmission housing. Preferably, the inner bearing ring of the second bearing arrangement is engaged with the rotor shaft arrangement, i.e., the rotor shaft and / or the planet carrier, or is integrated into the rotor shaft arrangement, i.e., the rotor shaft and / or the planet carrier.

[0015] To avoid axial stresses, i.e., stresses directed toward the axis of rotation of the rotor shaft, the present invention provides for a fixed-floating mounting of the rotor shaft and the housing in a structure fixed relative to the nacelle. According to one aspect of the invention, the first bearing is designed as a fixed bearing. This means that the rotor shaft is supported axially fixedly in the structure fixed relative to the nacelle by means of the first bearing. The first bearing thus forms a support that prevents any axial movement of the rotor shaft relative to the structure fixed relative to the nacelle. Furthermore, the axial position of the rotor shaft relative to the structure fixed relative to the nacelle is preferably clearly defined by the first bearing. In this case, the first bearing also serves as a support that prevents radial movement of the rotor shaft relative to the structure fixed relative to the nacelle.

[0016] The one or more torque supports are fixed in a rotationally fixed manner in the arrangement fixed to the nacelle. Thus, the drive torque applied to the housing arrangement via the rotor shaft arrangement and possibly other transmission elements can be supported by the torque supports in the arrangement fixed to the nacelle.

[0017] According to this aspect of the invention, the torque support is fixed in the structure fixed relative to the nacelle in an axially movable manner. Thus, the torque support can be axially moved at least a limited distance relative to the structure fixed relative to the nacelle.

[0018] Another aspect of the invention provides for the first bearing arrangement and the torque support to be configured in the arrangement fixed relative to the nacelle as fixed and floating bearings, respectively. Accordingly, the first bearing arrangement is configured as a floating bearing, and the torque support to be configured in the arrangement fixed relative to the nacelle as a fixed bearing.

[0019] The first bearing arrangement is configured as a floating bearing, which allows the rotor shaft arrangement to be axially displaced at least a limited distance relative to the structure fixed relative to the nacelle. According to another aspect of the invention, the torque support is fixed in the structure fixed relative to the nacelle in an axially fixed manner.

[0020] In a preferred embodiment, the second bearing arrangement is also designed as a fixed bearing. This means that the second bearing arrangement forms a support that prevents any axial movement of the rotor shaft arrangement and the housing arrangement relative to one another. Since the second bearing arrangement is designed as a fixed bearing, the rotor shaft arrangement and the housing arrangement cannot move axially relative to one another.

[0021] Preferably, the second bearing arrangement is a double-row tapered roller bearing. Such bearings can withstand high loads even at small diameters.

[0022] In a preferred embodiment, the first bearing arrangement and / or the second bearing arrangement are arranged on the rotor side relative to the planet carrier. This means that the first bearing arrangement and / or the second bearing arrangement are located on the same side of the planet carrier as the rotor and the rotor shaft, or on the same side of a radial plane intersecting the planet carrier.

[0023] In a preferred embodiment, the rotor shaft arrangement is supported exclusively by means of the first bearing arrangement and the second bearing arrangement. This means that there are no bearings for supporting the rotor shaft arrangement that are not part of the first bearing arrangement or the second bearing arrangement.

[0024] In an alternative preferred embodiment, a third bearing arrangement is provided to support the rotor shaft arrangement. According to this embodiment, the transmission housing has at least one spring element with a radial direction of action. The spring element is thus elastically deformable in at least one radial direction, i.e., perpendicular to the axis of rotation. Preferably, the spring element is elastically deformable in any radial direction. For example, the spring element can be designed as a diaphragm that is rotationally symmetrical with respect to the axis of rotation and has an S-shaped cross-section.

[0025] The planet carrier is supported in the spring element by means of the third bearing. The planet carrier is thus supported in the transmission housing via the third bearing and the spring element. The first and second bearings serve to position the rotor shaft, while the third bearing supports the weight of the region of the transmission housing extending from the torque support on the generator side in the rotor shaft.

[0026] The rotor shaft is preferably supported only by means of the first, second and third bearings, which means that there are no bearings for supporting the rotor shaft that are not part of the first, second or third bearings.

[0027] In a preferred embodiment, the third bearing arrangement is arranged on the generator side relative to the planet carrier. According to this embodiment, the third bearing arrangement and the generator are therefore located on the same side of the planet carrier or a radial plane intersecting the planet carrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Preferred embodiments of the present invention are shown in the accompanying drawings. Identical reference numerals denote identical or functionally identical features. Specifically:

[0029] Figure 1 shows the schematic structure of the drive system;

[0030] Figure 2 shows the design of the drive train; and

[0031] Figure 3 A fragment is shown. DETAILED DESCRIPTION

[0032] according to Figure 1 The rotor 101 of the wind turbine is supported on a rotor shaft 103. The rotor shaft 103 is connected to a planet carrier 105 in a rotationally fixed manner.

[0033] The first bearing device 107 and the second bearing device 109 are used to support the rotor shaft 103. The rotor shaft 103 is supported by the first bearing device 107. Figure 1The rotor shaft 103 is supported in a machine support (not shown) by means of a second bearing arrangement 109 in the interior of a double-arm torque support 111 .

[0034] The torque support 111 is connected to a transmission housing 115 via one or more spring elements 113. The transmission housing 115 together with the torque support 111 encloses the planet carrier 105. Thus, the planet carrier 105 is located in a cavity formed by the torque support 111 and the transmission housing 115.

[0035] The first bearing device 107 forms a fixed bearing. Therefore, the rotor shaft 103 is fixed in the machine frame in an axially immovable manner by the first bearing device 107.

[0036] The two arms of the torque support 111 are supported in the machine frame by means of floating bearings 117. The floating bearings 117 allow an axial movement of the torque support 111 relative to the machine frame.

[0037] The weight of the transmission housing 115 generates a torque in the floating bearing 117 , the direction of which is horizontally perpendicular to the rotational axis of the rotor shaft 103 and the planet carrier 105 . This torque is supported in the planet carrier 105 by one or more spring elements 119 .

[0038] The spring elements 119 are designed to be retractable in the radial direction. These spring elements extend between the transmission housing 115 and the hub 121, which is formed by the planet carrier 105 on the generator side. The hub 121 is rotatably supported in these spring elements 119 by means of another bearing arrangement.

[0039] Figure 2 The design of the drive system is explained. Figure 2 In FIG, the machine support is denoted by reference numeral 201. The planet carrier 105 forms a shaft end 203 on the rotor side. The second bearing device 109 is arranged on the shaft end 203. The shaft end 203 is screwed to the rotor shaft 103 in a rotationally fixed manner.

[0040] exist Figure 2 In FIG, a third bearing device 205 is shown, which absorbs the weight of the transmission housing 115. Figure 3 As can be seen in FIG, the third bearing device 205 is designed as a single-row tapered roller bearing. Accordingly, the third bearing device 205 can support the forces axially directed toward the rotor from the transmission housing 115 and radial forces on the planet carrier 105.

[0041] The arms of the torque support are each supported in the machine frame via a pin 207. To this end, the arms of the torque support 113 each form an eyelet 209, which surrounds the respective pin 207. The machine frame 201 also forms a second eyelet 211 and a third eyelet 213. The second eyelet 211 and the third eyelet 213 also surround the pin 207. Thus, the pin 207 extends through the first eyelet 209, the second eyelet 211, and the third eyelet 213.

[0042] The first eyelet 209 is arranged between the second eyelet 211 and the third eyelet 213. Starting from the first eyelet 209, the second eyelet 211 is located on the rotor side. Starting from the first eyelet 209, the third eyelet 213 is located on the generator side.

[0043] There is a free gap in each case between the first eyelet 209 and the second eyelet 211 and between the first eyelet 209 and the third eyelet 213. These two gaps enable an axial movement of the torque support 113.

[0044] Figure 3 The spring element 119 is shown as being integrated into the transmission housing 115. The spring element 119 is designed as a diaphragm which is rotationally symmetrical with respect to the rotation axis of the rotor shaft 103 and the planet carrier 105. Figure 3 In the cross section shown in FIG, the diaphragm is curved. Thus, it can expand and contract in the radial direction.

[0045] Reference numerals

[0046] 101 rotor

[0047] 103 rotor shaft

[0048] 105 planetary carrier

[0049] 107 bearing device

[0050] 109 bearing device

[0051] 111 torque support

[0052] 113 spring element

[0053] 115 transmission housing

[0054] 117 floating bearing

[0055] 119 spring element

[0056] 121 wheels

[0057] 201 machine bracket

[0058] 203 shaft end

[0059] 205 bearing device

[0060] 207 stopper

[0061] 209 Kongan

[0062] 211 Kongan

[0063] 213 Kongan

Claims

1. A drive device for a wind turbine, comprising: a rotor shaft device (103, 105), the rotor shaft device consisting of a rotor shaft (103) and a planet carrier (105), the planet carrier being connected to the rotor shaft (103) in a rotationally fixed manner; a first bearing device (107); a second bearing device (109); a housing device (111, 115), the housing device consisting of a transmission housing (115) and one or more torque supports (111), the one or more torque supports being fixed in the transmission housing (115) in a rotationally fixed manner; and a mechanism (201) fixed relative to the pod, wherein: The rotor shaft arrangement (103, 105) is supported in the arrangement (201) fixed relative to the pod by means of the first bearing arrangement (107) and in the transmission housing (115) by means of the second bearing arrangement (109), characterized in that: The first bearing device (107) is configured as a fixed bearing, and the one or more torque supports (111) are fixed in the structure (201) fixed relative to the nacelle in an axially movable manner.

2. A drive device for a wind turbine, the drive device comprising: a rotor shaft device (103, 105), the rotor shaft device consisting of a rotor shaft (103) and a planet carrier (105), the planet carrier being connected to the rotor shaft (103) in a rotationally fixed manner; a first bearing device (107); a second bearing device (109); a housing device (111, 115), the housing device consisting of a transmission housing (115) and one or more torque supports (111), the one or more torque supports being fixed in the transmission housing (115) in a rotationally fixed manner; and a mechanism (201) fixed relative to the pod, wherein: The rotor shaft arrangement (103, 105) is supported in the arrangement (201) fixed relative to the pod by means of the first bearing arrangement (107) and in the transmission housing (115) by means of the second bearing arrangement (109). It is characterized by: The first bearing device (107) is configured as a floating bearing, and the one or more torque supports (111) are fixed in an axially immovable manner in the mechanism (201) fixed relative to the nacelle.

3. The drive device according to any one of the preceding claims, characterized in that The second bearing device (109) is configured as a fixed bearing.

4. The drive device according to any one of the preceding claims, characterized in that The first bearing device (107) and / or the second bearing device (109) are arranged on the rotor side relative to the planet carrier (105).

5. The drive device according to any one of the preceding claims, characterized in that The rotor shaft arrangement (103, 105) is supported solely by means of the first bearing arrangement (107) and the second bearing arrangement (109).

6. The driving device according to any one of claims 1 to 4, characterized in that There is a third bearing device (205); wherein, The transmission housing (115) has at least one spring element (119) with a radial direction of action, The planet carrier (105) is supported in the spring element (119) by means of the third bearing arrangement (205).

7. Drive device according to the preceding claim, characterized in that The third bearing device (205) is arranged on the generator side relative to the planet carrier (105).

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