Gear box and generator assembly of wind turbine generator

Abstract

The utility model discloses a gearbox and generator assembly of a wind turbine generator. The gearbox and generator assembly comprises a gearbox and a generator. The gear box is provided with an output shaft assembly, and the output shaft assembly is detachably connected with a box body of the gear box. The generator is provided with a rotor and a transition flange, the transition flange is detachably installed in the rotor, and the transition flange is detachably connected with the output shaft assembly. Wherein the rotor is configured to be installed on a box body of the gear box through the connecting tool, and the inner cavity of the rotor is larger than the maximum outer diameter of the output shaft assembly, so that after the transition flange is detached, the output shaft assembly can be taken out of the rotor. According to the gearbox and generator assembly of the wind turbine generator and the disassembling method of the gearbox and generator assembly, a large crane or a hoisting ship does not need to be rented, the output shaft component with the highest failure rate is rapidly disassembled and reassembled, the maintenance difficulty and the maintenance cost are greatly reduced, and the shutdown generating capacity loss of the unit is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, and particularly relates to a gearbox and a generator assembly of a wind turbine unit. Background Art

[0002] With the competition in the wind power market, the prices of wind power equipment are constantly decreasing. Wind turbine manufacturers must continuously reduce manufacturing costs while ensuring that the performance meets the requirements. In the composition of the unit, the cost and performance of the transmission chain directly determine the cost and performance of the unit.

[0003] The traditional transmission chain of a wind turbine unit includes components such as a hub, a main shaft, a main shaft bearing, a bearing seat, a gearbox, a generator, and a coupling. To improve market competitiveness, the development trend of the transmission chain of a wind turbine unit is to integrate components such as the main shaft, the main bearing, the main bearing seat, the gearbox, and the generator into an integrated structure, thereby canceling some couplings and sharing the housing structure to reduce the number of components and shorten the length of the transmission chain to reduce weight, so as to achieve the purpose of cost reduction. The unit with this kind of structure is usually called a fully integrated transmission chain wind turbine unit. There is also a semi-integrated structure in which the gearbox and the generator in the transmission chain are integrated, or the gearbox and the main shaft components are integrated, while the other components are not integrated.

[0004] In the fully integrated transmission chain, the input shaft of the speed-increasing gearbox is rigidly connected to the rear end of the main shaft with bolts (or bolts + pins) to transmit the torque of the main shaft to the gearbox; the front housing of the gearbox is rigidly connected to the main shaft bearing seat with bolts; the rear housing of the gearbox is rigidly connected to the generator stator housing; the generator rotor is directly connected to the output shaft of the gearbox or connected through a coupling. In the semi-integrated structure, in one solution, the rear housing of the gearbox is rigidly connected to the generator stator housing; the generator rotor is directly connected to the output shaft of the gearbox or connected through a coupling.

[0005] Compared with the traditional wind power transmission chain structure, a main feature of the integrated or one of the semi-integrated transmission chain structures can be seen: the generator stator housing is fixed on the rear housing of the gearbox, and the generator rotor is suspended and installed on the output shaft of the gearbox. Thus, it can be seen that the generator is not an independent component, but the stator and the rotor are respectively suspended and installed at the rear end of the gearbox, combined with the gearbox as a whole to form a gearbox-generator integrated component. This kind of integrated component has the advantages of compact structure, light weight, and low cost.

[0006] However, there are also disadvantages, namely: the working speed of the sun gear of the output stage of the gearbox and the output shaft, bearings, etc. connected to it is much higher than that of the other components of the gearbox, belonging to the high-speed and heavy-load working conditions, so it is a high-fault-prone part. However, these components are surrounded by the generator stator at the center of the rear end of the gearbox, and axially blocked by the generator rotor. Once a failure occurs, it is impossible to repair / replace components on-site in the nacelle. To complete the repair / replacement, it is necessary to use a large crane (on land) or a lifting ship (at sea) to disassemble and lift out the entire gearbox-generator assembly from the nacelle, then transport it to the manufacturing factory, disassemble the generator from the rear end of the gearbox, and then repair the output stage sun gear or output shaft components of the gearbox (including the output shaft, output shaft bearings, sealing rings, etc.). After the repair is completed and transported back to the site, a large crane or a lifting ship is still needed to complete the reinstallation. The entire process has a large workload and extremely high lifting costs, resulting in a high final maintenance cost. In addition, since this method involves disassembly, transportation, repair, lifting and reinstallation of the machine, the entire maintenance cycle is time-consuming, and the power generation loss caused by shutdown is huge. Summary of the Utility Model

[0007] Based on this, in view of the problem that extremely high maintenance costs and power generation losses are easily generated when the gearbox part fails in the existing gearbox-generator integrated component, it is necessary to provide a gearbox and generator assembly for a wind turbine.

[0008] A gearbox and generator assembly for a wind turbine, comprising:

[0009] A gearbox having an output shaft assembly detachably connected to the housing of the gearbox;

[0010] A generator having a rotor and a transition flange detachably mounted within the rotor, the transition flange being detachably connected to the output shaft assembly;

[0011] Wherein, the rotor is configured to be mounted on the housing of the gearbox through a connecting tooling, and the inner cavity of the rotor is larger than the maximum outer diameter of the output shaft assembly, so that after the transition flange is disassembled, the output shaft assembly can be taken out from within the rotor.

[0012] In one embodiment, the output shaft assembly includes a bearing seat and an output shaft mounted on the bearing seat, the bearing seat being detachably mounted on the housing of the gearbox, and the transition flange being detachably connected to the output shaft.

[0013] In one embodiment, the output shaft assembly further includes an output stage sun gear, an output shaft bearing, an oil supply ring, a sealing ring, and an end cover. The output shaft is rotatably mounted on the bearing seat through the output shaft bearing. The output stage sun gear is connected to the output shaft. The oil supply ring and the sealing ring are mounted on the output shaft. The end cover is mounted on the bearing seat, and the end cover is used to limit the output shaft bearing.

[0014] In one embodiment, the rotor includes a rotor hub. The rotor hub is mounted inside the rotor. The transition flange is detachably connected to the rotor hub. The inner cavity of the rotor hub is larger than the maximum outer diameter of the output shaft assembly.

[0015] In one embodiment, the housing of the gearbox is provided with a positioning hole, and the rotor is provided with a maintenance hole. The connecting tooling is used to pass through the positioning hole and the maintenance hole to mount the rotor on the housing of the gearbox.

[0016] In one embodiment, the connecting tooling includes a fixing tooling, a threaded fastener, and a locking nut. The fixing tooling passes through the positioning hole and the maintenance hole. The fixing tooling is provided with a through hole along the axial direction. One end of the threaded fastener is threadedly connected to the positioning hole through the through hole. The other end of the threaded fastener is axially limited to the fixing tooling through a limiting head. The locking nut is mounted on the fixing tooling to limit the rotor.

[0017] In one embodiment, the threaded fastener is a bolt, and the limiting head is the head of the bolt; or

[0018] The threaded fastener is a screw rod, and the limiting head is a nut. The nut is screwed onto the end of the screw rod.

[0019] In one embodiment, the end of the fixing tooling inserted into the positioning hole is provided with a chamfer.

[0020] In one embodiment, the housing of the gearbox is provided with a fixed support, and the positioning hole is provided on the fixed support; and / or

[0021] The rotor is provided with a fixed support, and the maintenance hole is provided on the fixed support.

[0022] In one embodiment, the positioning hole and the maintenance hole are evenly distributed at intervals in the circumferential direction.

[0023] For the gearbox and generator assembly of the above wind turbine, the output shaft assembly is a detachable component. During the disassembly process of the output shaft assembly, the rotor is installed on the gearbox housing through a connecting tooling, suspended and fixed on the gearbox housing, so that the transition flange no longer bears gravity. Then, the transition flange is disassembled to form a maintenance passage, and finally the output shaft assembly is disassembled. The inner cavity of the rotor is larger than the maximum outer diameter of the output shaft assembly, and the output shaft assembly can be taken out from the rotor. This part of the operation can be completed in the nacelle without overall disassembly of the gearbox-generator components. Since the weights of the output shaft assembly, transition flange, etc. are much smaller than the weight of the gearbox-generator integrated assembly, there is no need to rent a large crane or lifting ship, achieving rapid disassembly and reinstallation in the nacelle of the output sun gear and output shaft components of the gearbox with the highest failure rate, thus simplifying the maintenance work of the gearbox-generator assembly, greatly reducing the maintenance difficulty and cost, shortening the maintenance cycle, further reducing the loss of power generation during the unit shutdown, and ultimately enhancing the competitiveness of the unit. Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0025] Figure 1 It is a schematic structural diagram of the gearbox and generator assembly of a wind turbine in an embodiment;

[0026] Figure 2 It is Figure 1 a schematic structural diagram of the output shaft assembly in

[0027] Figure 3 It is Figure 1 a schematic structural diagram of the generator transition flange in

[0028] Figure 4 It is Figure 1 a schematic diagram of the generator rotor installed on the gearbox housing through a connecting tooling in

[0029] Figure 5 It is Figure 4 a partial enlarged view of A in

[0030] Figure 6 It is a schematic diagram of the positioning holes designed on the gearbox housing;

[0031] Figure 7 It is a schematic diagram of the maintenance hole on the generator rotor;

[0032] Figure 8 It is a flowchart of the disassembly method of the gearbox and generator assembly of a wind turbine in an embodiment;

[0033] Figure 9 This is a schematic diagram for removing the accessories of the generator rear cover;

[0034] Figure 10 It is a schematic diagram of installing the fixing tool in the positioning hole and the maintenance hole;

[0035] Figure 11 It is a schematic diagram of installing threaded fasteners in a fixed tooling;

[0036] Figure 12 This is a schematic diagram of the completed installation of the connecting tooling;

[0037] Figure 13 This is a schematic diagram for removing the brake disc bracket;

[0038] Figure 14 This is a schematic diagram for disassembling the transition flange;

[0039] Figure 15 Schematic diagram for removing the output shaft assembly.

[0040] Reference numerals:

[0041] 10-gearbox, 11-output shaft assembly, 111-bearing seat, 112-output shaft, 113-output stage sun gear, 114-output shaft bearing, 115-oil supply ring, 116-sealing ring, 117-end cover, 12-box, 121-positioning hole, 13-fixed support, 20-generator, 21-rotor, 22-transition flange, 23-rotor hub, 24-maintenance hole, 25-rear cover accessories, 26-operating space, 27-brake disc bracket, 30-connecting tooling, 31-fixed tooling, 311-through hole, 32-threaded fastener, 322-limiting head, 33-locking nut, 40-hanging fixture, 41-hanging bracket, 411-crossbeam, 412-vertical rod, 413-boom, 414-connecting plate, 42-hanging rope. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0043] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used herein in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model.

[0045] Please refer to Figure 1 , the gearbox and generator assembly of a wind turbine in an embodiment includes a gearbox 10 and a generator 20.

[0046] Among them, the gearbox 10 has an output shaft assembly 11, and the output shaft assembly 11 is detachably connected to the housing 12 of the gearbox 10. Among them, the output shaft assembly 11 is integrated as a whole, and the output shaft assembly 11 can be independently disassembled and assembled as a whole. During maintenance, only the connection between the output shaft assembly 11 and the housing 12 needs to be removed, and all parts of the output shaft assembly 11 can be removed from the rear end of the gearbox 10 as a whole, realizing rapid independent maintenance and reinstallation.

[0047] Please refer to together Figure 2 , in an embodiment, the output shaft assembly 11 includes a bearing seat 111 and an output shaft 112. The bearing seat 111 is detachably mounted on the housing 12 of the gearbox 10, the output shaft 112 is mounted on the bearing seat 111, and the bearing seat 111 constitutes the maximum outer diameter of the output shaft assembly 11. Specifically, the bearing seat 111 is mounted on the rear housing of the gearbox 10 by bolts.

[0048] Furthermore, the output shaft assembly 11 further includes an output stage sun gear 113, an output shaft bearing 114, an oil supply ring 115, a sealing ring 116 and an end cover 117. The output shaft 112 is rotatably mounted on the bearing seat 111 through the output shaft bearing 114, the output stage sun gear 113 is connected to the output shaft 112, the oil supply ring 115 and the sealing ring 116 are mounted on the output shaft 112, and the end cover 117 is mounted on the bearing seat 111, and the end cover 117 is used to limit the output shaft bearing 114.

[0049] Please refer to together Figure 3, the generator 20 has a rotor 21 and a transition flange 22. The housing of the generator 20 is connected to the housing 12 of the gearbox 10. The transition flange 22 is installed inside the rotor 21 and is detachably connected to the output shaft assembly 11.

[0050] Specifically, the rotor 21 includes a rotor hub 23. The rotor hub 23 is located in the inner cavity of the rotor 21, and the transition flange 22 is detachably connected to the rotor hub 23. Specifically, in this embodiment, the transition flange 22 is connected to the rotor hub 23 of the rotor 21 by bolts, and the transition flange 22 is connected to the output shaft 112 by bolts or pins.

[0051] Please refer to Figure 4 simultaneously. The rotor 21 is configured to be installed on the housing 12 of the gearbox 10 through a connection tooling 30, so that the weight of the rotor 21 can be transferred from being borne by the output shaft 112 to being borne by the housing 12 of the gearbox 10. Then, components such as the transition flange 22 inside the rotor 21 of the generator 20 can be removed to form a maintenance passage for the output assembly of the gearbox 10.

[0052] The inner cavity of the rotor 21 is larger than the maximum outer diameter of the output shaft assembly 11. Before disassembling the output shaft assembly 11, first remove the transition flange 22, then the output shaft assembly 11 can be disassembled and reinstalled through the inner cavity of the rotor hub 23. Specifically, the inner cavity of the rotor hub 23 is larger than the maximum outer diameter of the output shaft assembly 11, that is, the inner cavity of the rotor hub 23 is larger than the outer diameter of the bearing seat 111.

[0053] Please refer to Figure 5 simultaneously. In one embodiment, the housing 12 of the gearbox 10 is provided with positioning holes 121, and the rotor 21 is provided with maintenance holes 24. The positioning holes 121 and the maintenance holes 24 correspond one by one, and the connection tooling 30 is inserted into the positioning holes 121 and the maintenance holes 24 to install the rotor 21 on the housing 12 of the gearbox 10.

[0054] In one embodiment, the connection tooling 30 includes a fixing tooling 31, a threaded fastener 32, and a locking nut 33. The fixing tooling 31 is generally a hollow cylindrical structure, and the fixing tooling 31 is provided with a through hole 311 along its axial direction. The front end of the fixing tooling 31 is provided with an installation chamfer, which is beneficial for initial guiding and positioning, aligning with the positioning hole 121, and realizing the guiding during the installation process. The diameter of the fixing tooling 31 is smaller than the sizes of the positioning hole 121 and the maintenance hole 24. After the fixing tooling 31 is inserted into the positioning hole 121 and the maintenance hole 24, a small gap is formed, which can reduce the assembly difficulty.

[0055] The threaded fastener 32 is inserted into the through hole 311 of the fixing tooling 31. One end of the threaded fastener 32 extends out of the fixing tooling 31 and is threadedly connected to the positioning hole 121. The other end of the threaded fastener 32 is axially limited by the limiting head 322 with respect to the fixing tooling 31, preventing the threaded fastener 32 from separating from the fixing tooling 31. Specifically, when the threaded fastener 32 is a bolt, the limiting head 322 is the head of the bolt; when the threaded fastener 32 is a screw rod, the limiting head 322 is a nut, and the nut is screwed onto the end of the screw rod.

[0056] The lock nut 33 is installed on the fixing tooling 31 and is used to limit the rotor 21. Specifically, the fixing tooling 31 is inserted into the positioning hole 121 and the maintenance hole 24. The rear end of the fixing tooling 31 extends out of the maintenance hole 24. The rear end of the fixing tooling 31 is provided with an external thread, and the lock nut 33 is screwed onto the rear end of the fixing tooling 31, and the lock nut 33 is in close contact with the end face of the maintenance hole 24, preventing the rotor 21 from slipping off the fixing tooling 31. Among them, since the drive chain of the wind turbine is installed obliquely, the gravity of the rotor 21 of the generator 20 generates a component force in the axial direction, ensuring that the axial component force is greater than the axial tension generated by the tightening torque of the lock nut 33, and finally realizing the positioning of the rotor 21 of the generator 20.

[0057] Please refer to Figure 6 and Figure 7 In one embodiment, a fixed support 13 is provided on the housing 12 of the gearbox 10, and the positioning hole 121 is provided on the fixed support 13. The maintenance hole 24 is provided on the rotor hub 23, and a fixed support 13 is provided on the rotor hub 23, and the positioning hole 121 is provided on the fixed support 13. Specifically, 8 fixed supports 13 are designed on the housing 12 of the gearbox 10 in a circumferential distribution. Each fixed support 13 is designed with a positioning hole 121. Corresponding to the rotor hub 23, there are also 8 corresponding fixed supports 13, and each fixed support 13 is designed with a maintenance hole 24.

[0058] Of course, in other embodiments, the positioning hole 121 can also be directly designed on the housing 12 of the gearbox 10, the maintenance hole 24 can be directly designed on the rotor hub 23, and the number of the positioning hole 121 and the maintenance hole 24 can be specifically selected according to actual needs, such as according to the specifications and total weight of the rotor 21. The positioning hole 121 and the maintenance hole 24 can be evenly distributed in the circumferential direction or designed to be symmetrically arranged up and down.

[0059] Please refer to Figure 8 The present invention also provides a disassembly method for the gearbox and generator assembly of a wind turbine, which is used to disassemble the output shaft assembly 11 in the above-mentioned gearbox and generator assembly of the wind turbine for maintenance or replacement. Specifically, the disassembly method includes the following steps:

[0060] Step S110: Disassemble the rear cover accessories 25 of the generator 20 to expose the operation space 26 inside the rotor 21.

[0061] Please refer to Figure 9 as well. Specifically, disassemble the protective cover at the rear end of the generator 20, and remove accessories such as the brake and brake disc. After the disassembly is completed, the operation space 26 can be formed.

[0062] In an embodiment, before step S110, it further includes: positioning the drive chain of the wind turbine generator set to align the positioning hole 121 with the maintenance hole 24, and locking the wind wheel. Before maintenance, it is necessary to fix the drive chain of the wind turbine generator set to prevent the gearbox 10 and the generator 20 from rotating or yawing, which may affect the maintenance operation. The drive chain can be fixed by using a wind wheel lock. During positioning, start the drive chain to rotate slowly until the maintenance positioning hole 121 on the rear housing 12 of the gearbox 10 is basically aligned with the maintenance positioning hole 121 on the rotor hub 23 of the generator 20, and then lock the wind wheel.

[0063] Step S120: Install the rotor 21 of the generator 20 on the housing 12 of the gearbox 10 through the connection tooling 30.

[0064] Specifically, insert the fixing tooling 31 into the positioning hole 121 and the maintenance hole 24, and then insert the threaded fastener 32 into the positioning hole 121 through the through hole 311 of the fixing tooling 31. Thread one end of the threaded fastener 32 with the positioning hole 121, and axially limit the other end of the threaded fastener 32 with the fixing tooling 31 through the limiting head 322. Install the locking nut 33 at the end of the fixing tooling 31, make the locking nut 33 closely adhere to the end face of the maintenance hole 24 and apply the required torque, so as to transfer the weight of the rotor 21 from being borne by the output shaft 112 to being borne by the housing 12 of the gearbox 10. Since the drive chain of the wind turbine generator set is installed obliquely, the gravity of the rotor 21 of the generator 20 generates a component force in the axial direction. Ensure that the axial component force is greater than the axial tension generated by the tightening torque of the locking nut 33, and finally realize the positioning of the rotor 21 of the generator 20.

[0065] Please refer to Figure 10 as well. In a specific embodiment, the above steps are specifically as follows: Remove the end cover 117 on the maintenance hole 24 of the rotor hub 23 of the generator 20, and sequentially install all the fixing tooling 31. During installation, since the maintenance hole 24 on the rotor hub 23 and the positioning hole 121 on the housing 12 of the gearbox 10 have been initially aligned, at this time, the fixing tooling 31 can be first inserted into the maintenance hole 24 on the rotor hub 23 of the generator 20; then finely adjust the rotation angle of the drive chain until the fixing tooling 31 is inserted into the positioning hole 121 of the housing 12 of the gearbox 10.

[0066] Please refer to Figure 11, after the fixing tooling 31 is inserted into the positioning hole 121, the threaded fastener 32 is screwed into the positioning hole 121 through the middle through-hole 311 and the required torque is applied, so as to fix the fixing tooling 31 to the box body 12. After all the fixing toolings 31 are inserted into the positioning holes 121 and all the threaded fasteners 32 are tightened, the gravity of the rotor 21 of the generator 20 can be borne by the box body 12 of the gearbox 10. Since the front end of the fixing tooling 31 is designed with a chamfer, it can play a guiding role during assembly and help with smooth installation.

[0067] Please refer to Figure 12 , then the locking nut 33 is screwed into the rear end of the fixing tooling 31 in sequence, so that it is close to the end plane of the maintenance hole 24 of the rotor 21 of the generator 20, and the required torque is applied. Since the drive chain of the wind turbine is installed obliquely, the gravity of the rotor 21 of the generator 20 generates a component force in the axial direction. Ensure that the axial component force is greater than the axial tension generated by the tightening torque of the locking nut 33, and finally realize the positioning of the rotor 21 of the generator 20.

[0068] Step S130: Remove the transition flange 22 and move it out of the generator 20 for placement outside.

[0069] Please refer to Figure 13 , specifically, after the rotor 21 of the generator 20 is fixed, first remove the brake disc bracket 27 installed on the transition flange 22. First loosen all the connecting bolts, then use the lifting tool 40 to support the brake disc bracket 27; then remove all the loosened bolts, and use the lifting tool 40 to move the brake disc bracket 27 out of the generator 20 and place it in a safe position in the nacelle.

[0070] Please refer to Figure 14 , after removing the brake disc bracket 27, first remove all the connecting bolts between the transition flange 22 and the rotor hub 23, and some of the connecting bolts between the transition flange 22 and the output shaft 112 that hinder the installation of the lifting tool 40. Then connect the transition flange 22 and the lifting tool 40 by using the bolt holes for installing the brake disc bracket 27 on the transition flange 22, and then remove the remaining connecting bolts between the transition flange 22 and the output shaft 112. At this time, the transition flange 22 can be removed and moved out of the generator 20 and placed in a safe position in the nacelle.

[0071] In an embodiment, the lifting tool 40 includes a lifting frame 41 and a lifting rope 42 connecting the lifting frame 41. The lifting frame 41 has a cross beam 411, a vertical rod 412 and a lifting arm 413 parallel to the cross beam 411. The vertical rod 412 connects the lifting arm 413 and the cross beam 411, and the lifting rope 42 is connected to the cross beam 411. Among them, when hoisting the brake disc bracket 27 and the transition flange 22, the lifting arm 413 extends into the rotor 21 of the generator 20 and is connected to the brake disc bracket 27 and the transition flange 22.

[0072] Step S140: Disassemble the output shaft assembly 11, and move the output shaft assembly 11 out of the generator 20 through the cavity inside the rotor 21.

[0073] Specifically, disassemble the output shaft assembly 11 from the housing 12 of the gearbox 10, extend the lifting arm 413 of the lifting device 40 into the rotor 21 to connect with the output shaft assembly 11, and use a linear drive mechanism to move the output shaft assembly 11 out of the inner cavity of the rotor 21.

[0074] Please refer to Figure 15 , in a specific embodiment, the above steps are specifically as follows: First, it is necessary to completely remove the connecting bolts between the bearing seat 111 and the housing 12 of the gearbox 10. Then, install a connecting plate 414 at the front end of the lifting arm 413 of the lifting device 40, and firmly fix the connecting plate 414 and the output shaft 112 together with bolts. After the lifting device 40 is fixed to the output shaft assembly 11, tools such as a hydraulic cylinder and a linear motor can be used to gradually withdraw the output shaft assembly 11 from the mounting hole of the housing 12 of the gearbox 10, and then remove it outside the generator 20 and place it safely. Since the output shaft assembly 11 is relatively heavy, the bundling position of the lifting rope 42 of the lifting device 40 needs to be moved forward so that the force center of gravity of the lifting rope 42 is basically the same as the center of gravity of the output shaft assembly 11 in the vertical direction.

[0075] For the gearbox and generator assembly of the above wind turbine and its disassembly method, the operation of disassembling the output shaft assembly 11 can be completed in the nacelle without overall disassembly of the gearbox 10 and generator 20 components. Since the weights of the output shaft assembly 11, the transition flange 22, etc. are much smaller than the weight of the gearbox 10 - generator 20 integrated assembly, there is no need to rent a large crane or a lifting ship, realizing the rapid disassembly and reinstallation in the nacelle of the output sun gear and the output shaft 112 components of the gearbox 10 with the highest failure rate, thereby simplifying the maintenance work of the gearbox 10 - generator 20 assembly, greatly reducing the maintenance difficulty and maintenance cost, shortening the maintenance cycle, further reducing the loss of power generation during the downtime of the unit, and ultimately enhancing the competitiveness of the unit.

[0076] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and the description of the present invention.

Claims

1. A gearbox and generator assembly of a wind turbine, characterized in that, Comprising: A gearbox having an output shaft assembly detachably connected to the housing of the gearbox; A generator having a rotor and a transition flange detachably mounted within the rotor and detachably connected to the output shaft assembly; Wherein, the rotor is configured to be mounted on the housing of the gearbox through a connection tooling, and the inner cavity of the rotor is larger than the maximum outer diameter of the output shaft assembly, so that after the transition flange is removed, the output shaft assembly can be taken out from within the rotor.

2. The gearbox and generator assembly of a wind turbine unit according to claim 1, characterized in that, The output shaft assembly includes a bearing seat and an output shaft mounted on the bearing seat, the bearing seat being detachably mounted on the housing of the gearbox, and the transition flange being detachably connected to the output shaft.

3. The gearbox and generator assembly of the wind turbine according to claim 2, characterized in that, The output shaft assembly further includes an output stage sun gear, an output shaft bearing, an oil supply ring, a sealing ring and an end cover. The output shaft is rotatably mounted on the bearing seat through the output shaft bearing. The output stage sun gear is connected to the output shaft. The oil supply ring and the sealing ring are mounted on the output shaft. The end cover is mounted on the bearing seat and is used to limit the output shaft bearing.

4. The gearbox and generator assembly of a wind turbine according to claim 1, characterized in that, The rotor includes a rotor hub mounted within the rotor, the transition flange being detachably connected to the rotor hub, and the inner cavity of the rotor hub being larger than the maximum outer diameter of the output shaft assembly.

5. The gearbox and generator assembly of a wind turbine according to claim 1, characterized in that, The housing of the gearbox is provided with a positioning hole, and the rotor is provided with a maintenance hole. The connection tooling is used to pass through the positioning hole and the maintenance hole to mount the rotor on the housing of the gearbox.

6. The gearbox and generator assembly of a wind turbine according to claim 5, characterized in that, The connection tooling includes a fixing tooling, a threaded fastener and a locking nut. The fixing tooling passes through the positioning hole and the maintenance hole. The fixing tooling is provided with a through hole along the axial direction. One end of the threaded fastener is threadedly connected in the positioning hole through the through hole. The other end of the threaded fastener is axially limited by a limiting head with the fixing tooling. The locking nut is mounted on the fixing tooling to limit the rotor.

7. The gearbox and generator assembly of a wind turbine according to claim 6, characterized in that, The threaded fastener is a bolt and the limiting head is the head of the bolt; or The threaded fastener is a screw rod and the limiting head is a nut screwed onto the end of the screw rod.

8. The gearbox and generator assembly of a wind turbine according to claim 6, characterized in that, The end of the fixing tooling inserted into the positioning hole is provided with a chamfer.

9. The gearbox and generator assembly of a wind turbine according to claim 5, characterized in that, The housing of the gearbox is provided with a fixing support, and the positioning hole is provided on the fixing support; and / or The rotor is provided with a fixing support, and the maintenance hole is provided on the fixing support.

10. The gearbox and generator assembly of the wind turbine according to claim 5, characterized in that, The positioning hole and the maintenance hole are evenly distributed at intervals in the circumferential direction.

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