Wind turbine hub main shaft connecting structure and wind turbine
By using a combination of limiting components and bolts in the connection structure of the wind turbine, the problem of bolt damage caused by slippage of the wind turbine main shaft and hub was solved, achieving a reliable connection and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SANY ELECTRIC CO LTD
- Filing Date
- 2025-07-31
- Publication Date
- 2026-06-19
AI Technical Summary
In existing technologies, the connection surfaces of wind turbine main shafts and hubs are prone to slippage and misalignment due to excessive torque and insufficient bolt preload, which can damage the bolts, increase operational risks, and existing solutions that increase the diameter or number of bolts are costly.
A limiting component is installed between the spindle and the hub, and bolts are used to connect them. When relative slippage occurs between the hub and the spindle, the limiting component prevents their circumferential relative position and avoids the bolts from bearing shear force. A simple countersunk hole and limiting component design is used.
It effectively prevents relative slippage between the hub and the main shaft, protects the bolts from shear forces, extends bolt life, and reduces costs without relying on increasing the bolt diameter or number.
Smart Images
Figure CN224380002U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of wind power generation technology, and in particular to a hub shaft connection structure for a wind turbine and a wind turbine. Background Technology
[0002] In the wind power sector, the connection surfaces of the wind turbine's main shaft and hub are typically treated with zinc spraying to increase friction, and connected with bolts or studs. To ensure reliability, the bolts may have one, two, or more turns. However, due to the complex operating conditions of wind power equipment, if the torque is too high and the bolt preload is insufficient, the mating surfaces of the hub and main shaft are prone to slippage and misalignment, leading to bolt shear failure, damage to the threaded holes, and increased operational risks.
[0003] In existing technologies, preload is typically increased by increasing bolt diameter, the number of bolts, and the diameter of the bolt distribution circle, thereby increasing the friction between the hub and the spindle connection surface. However, these measures can only alleviate the problem of bolt damage caused by relative slippage between the hub and the spindle to a certain extent. When the torque is too high, the hub and the spindle may still slip relative to each other, and this method also significantly increases costs. Utility Model Content
[0004] To address at least one of the problems mentioned in the background art, this application provides a wind turbine hub main shaft connection structure and a wind turbine, which can avoid bolt damage caused by relative slippage between the hub and the main shaft, and is low in cost.
[0005] To achieve the above objectives, this application provides the following technical solution:
[0006] In a first aspect, this application provides a wind turbine hub main shaft connection structure, including a hub, a main shaft and connecting components. The hub is connected to one end of the main shaft along the axial direction through multiple connecting components. The end of the main shaft along its own axial direction has a first countersunk hole. The bottom of the first countersunk hole has a first connecting hole with a diameter smaller than the first countersunk hole. The end of the hub facing the main shaft has a second countersunk hole. The bottom of the second countersunk hole has a second connecting hole with a diameter smaller than the second countersunk hole.
[0007] The connecting assembly includes bolts and a limiting member. The limiting member has a mounting hole. A portion of the limiting member is mounted in a first countersunk hole, and another portion of the limiting member is mounted in a second countersunk hole. The first connecting hole, the mounting hole, and the second connecting hole are opposite to and communicate with each other along the axial direction of the spindle. The bolts are threaded into the first connecting hole, the mounting hole, and the second connecting hole to connect the hub and the spindle together.
[0008] As an optional implementation, the bottom of the first countersunk hole also has a third connecting hole, which is located around the first connecting hole. The limiting member has a fourth connecting hole corresponding to the position of the third connecting hole. The connecting assembly also includes a screw, which is threaded into the fourth connecting hole and the third connecting hole to fix the limiting member in the first countersunk hole.
[0009] As an alternative implementation, there is a gap between the bottom of the limiting member and the second countersunk hole along the axial direction of the spindle.
[0010] As an optional implementation, the spacing along the main shaft axis is greater than or equal to 2 mm.
[0011] As an optional implementation, there is a gap between the limiting member and the sidewall of the first countersunk hole and the sidewall of the second countersunk hole.
[0012] As an optional implementation, the bottom edges of the first and second countersunk holes are rounded.
[0013] As an optional implementation, the depth of the second countersunk hole is greater than the depth of the first countersunk hole.
[0014] As an optional implementation, the cross-section of the limiting member along the radial direction of the main axis is circular or square.
[0015] As an alternative implementation, the limiting component and the bolt are integrally molded.
[0016] Secondly, this application also provides a wind turbine generator set, including the wind turbine generator set hub main shaft connection structure of the first aspect.
[0017] The wind turbine hub-main shaft connection structure provided in this application includes a hub, a main shaft, and connecting components. The hub is connected to one end of the main shaft along its axial direction through multiple connecting components. The end of the main shaft along its own axial direction has a first countersunk hole, and the bottom of the first countersunk hole has a first connecting hole with a diameter smaller than the first countersunk hole. The end of the hub facing the main shaft has a second countersunk hole, and the bottom of the second countersunk hole has a second connecting hole with a diameter smaller than the second countersunk hole. The connecting components include bolts and limiting members. The limiting members have mounting holes. A part of the limiting member is installed in the first countersunk hole, and the other part of the limiting member is installed in the second countersunk hole. The first connecting hole, the mounting hole, and the second connecting hole are opposite to each other along the axial direction of the main shaft and are connected. The bolts are threadedly connected to the first connecting hole, the mounting hole, and the second connecting hole to connect the hub and the main shaft together.
[0018] The wind turbine hub-main shaft connection structure provided in this application uses a limiting component between the main shaft and the hub. Bolts pass through this limiting component. When the wind power generation equipment is running, a large torque is generated between the hub and the main shaft, causing the hub to tend to slip relative to the main shaft. The limiting component installed in the first countersunk hole of the main shaft and the second countersunk hole of the hub ensures the relative position of the hub and the main shaft along the circumference, effectively preventing relative slippage. This effectively protects the bolts, preventing them from directly bearing shear force and extending their service life. Moreover, compared with existing technologies, this solution does not rely on increasing the bolt diameter, the number of bolts, or the diameter of the bolt distribution circle, which increases costs. It achieves a reliable connection between the hub and the main shaft solely through a simple countersunk hole and limiting component structure design, effectively reducing costs. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 A first schematic diagram of the wind turbine hub main shaft connection structure provided in the embodiments of this application;
[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;
[0022] Figure 3 This is a second schematic diagram of the wind turbine hub main shaft connection structure provided in the embodiments of this application;
[0023] Figure 4 for Figure 3 Enlarged view of point B in the middle;
[0024] Figure 5 This is a third schematic diagram of the wind turbine hub main shaft connection structure provided in the embodiments of this application;
[0025] Figure 6 for Figure 5 Enlarged view of point C in the middle;
[0026] Figure 7 This is a first installation diagram of the main shaft and limiting component in the wind turbine hub main shaft connection structure provided in the embodiments of this application;
[0027] Figure 8 This is a second installation diagram of the main shaft and limiting component in the wind turbine hub main shaft connection structure provided in the embodiments of this application;
[0028] Figure 9 This is a fourth schematic diagram of the wind turbine hub main shaft connection structure provided in the embodiments of this application.
[0029] Explanation of reference numerals in the attached figures:
[0030] 100 - Wind turbine hub main shaft connection structure;
[0031] 110 - Wheel hub;
[0032] 111 - Second countersunk hole;
[0033] 112 - Second connecting hole;
[0034] 120-spindle;
[0035] 121 - First countersunk hole;
[0036] 122 - First connecting hole;
[0037] 123 - Third connecting hole;
[0038] 130 - Connecting components;
[0039] 131- Bolt;
[0040] 132 - Limiting component;
[0041] 1321 - Fourth connecting hole;
[0042] 133 - Screw;
[0043] 140- Spacing;
[0044] 150-Rounded corner structure. Detailed Implementation
[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0046] In this application, the terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” “outer,” “vertical,” “horizontal,” “lateral,” and “longitudinal” indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.
[0047] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0048] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0049] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.
[0050] Wind power equipment operates under complex conditions. If the torque is too high and the bolt preload is insufficient, the mating surfaces of the hub and main shaft are prone to slippage and misalignment, leading to bolt shear failure, damage to threaded holes, and increased operational risks. Current technologies typically increase preload by increasing bolt diameter, the number of bolts, and the diameter of the bolt distribution circle, thereby increasing the friction between the hub and main shaft mating surfaces. However, these measures only alleviate the problem of bolt damage caused by relative slippage between the hub and main shaft to a certain extent. When the torque is too high, relative slippage between the hub and main shaft is still possible, and this approach also significantly increases costs.
[0051] In view of this, this application provides a wind turbine hub main shaft connection structure, including a hub, a main shaft, and connecting components. The hub is connected to one end of the main shaft along its axial direction through multiple connecting components. The end of the main shaft along its own axial direction has a first countersunk hole, and the bottom of the first countersunk hole has a first connecting hole with a diameter smaller than the first countersunk hole. The end of the hub facing the main shaft has a second countersunk hole, and the bottom of the second countersunk hole has a second connecting hole with a diameter smaller than the second countersunk hole. The connecting components include bolts and limiting members. The limiting members have mounting holes. A part of the limiting member is installed in the first countersunk hole, and the other part of the limiting member is installed in the second countersunk hole. The first connecting hole, the mounting hole, and the second connecting hole are opposite to and communicate with each other along the axial direction of the main shaft. The bolts are threadedly connected to the first connecting hole, the mounting hole, and the second connecting hole. When the hub tends to slip relative to the spindle, the limiting components installed in the first countersunk hole of the spindle and the second countersunk hole of the hub ensure the relative position of the hub and the spindle in the circumferential direction, effectively preventing relative slippage. This effectively protects the bolts, preventing them from directly bearing shear forces and extending their service life. Compared with existing technologies, this solution does not rely on increasing the bolt diameter, the number of bolts, or the diameter of the bolt distribution circle, which would increase costs. It achieves a reliable connection between the hub and the spindle solely through a simple countersunk hole and limiting component structure design, effectively reducing costs.
[0052] Figure 1 A first schematic diagram of the wind turbine hub main shaft connection structure provided in the embodiments of this application; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a second schematic diagram of the wind turbine hub main shaft connection structure provided in the embodiments of this application; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 This is a third schematic diagram of the wind turbine hub main shaft connection structure provided in the embodiments of this application; Figure 6 for Figure 5 Enlarged view of point C in the middle; Figure 7 This is a first installation diagram of the main shaft and limiting component in the wind turbine hub main shaft connection structure provided in the embodiments of this application; Figure 8 This is a second installation diagram of the main shaft and limiting component in the wind turbine hub main shaft connection structure provided in the embodiments of this application; Figure 9 This is a fourth schematic diagram of the wind turbine hub main shaft connection structure provided in the embodiments of this application.
[0053] You can refer to this. Figures 1 to 9This application provides a wind turbine hub main shaft connection structure 100, including a hub 110, a main shaft 120, and connecting components 130. The hub 110 is connected to one end of the main shaft 120 axially via multiple connecting components 130. The end of the main shaft 120 along its own axial direction has a first countersunk hole 121, and the bottom of the first countersunk hole 121 has a first connecting hole 122 with a diameter smaller than the first countersunk hole 121. The end of the hub 110 facing the main shaft 120 has a second countersunk hole 111, and the bottom of the second countersunk hole 111 has a diameter smaller than the second countersunk hole 122. The second connecting hole 112 of hole 111; the connecting assembly 130 includes a bolt 131 and a limiting member 132. The limiting member 132 has a mounting hole. A part of the limiting member 132 is installed in the first countersunk hole 121, and the other part of the limiting member 132 is installed in the second countersunk hole 111. The first connecting hole 122, the mounting hole, and the second connecting hole 112 are opposite to and communicate with each other along the axial direction of the main shaft 120. The bolt 131 is threadedly connected to the first connecting hole 122, the mounting hole, and the second connecting hole 112 to connect the hub 110 and the main shaft 120 together.
[0054] The wind turbine hub main shaft connection structure 100 provided in this application embodiment provides a limiting member 132 between the main shaft 120 and the hub 110. The bolt 131 passes through the limiting member 132. When the wind power generation equipment is running, a large torque is generated between the hub 110 and the main shaft 120, and the hub 110 has a relative slippage tendency relative to the main shaft 120. The limiting member 132 installed in the first countersunk hole 121 of the main shaft 120 and the second countersunk hole 111 of the hub 110 can ensure the relative position of the hub 110 and the main shaft 120 in the circumferential direction, effectively preventing the hub 110 and the main shaft 120 from slipping relative to each other. This can effectively protect the bolt 131, prevent the bolt 131 from directly bearing shear force, and extend the service life of the bolt 131. Moreover, compared with the existing technology, this solution does not rely on increasing the diameter of bolt 131, increasing the number of bolts 131, or increasing the diameter of the distribution circle of bolt 131, which would increase costs. It can achieve a reliable connection between the hub 110 and the main shaft 120 simply through the simple countersunk hole and limiting component 132 structural design, which effectively reduces costs.
[0055] In the above embodiment, the bottom of the first countersunk hole 121 may also have a third connecting hole 123, which is located around the first connecting hole 122. The limiting member 132 has a fourth connecting hole 1321 corresponding to the position of the third connecting hole 123. The connecting assembly also includes a screw 133, which is threaded into the fourth connecting hole 1321 and the third connecting hole 123 to fix the limiting member 132 in the first countersunk hole 121. The screw 133 can fix the limiting member 132, preventing it from shaking in the countersunk hole. This fixing method ensures that the limiting member 132 will not fall during transportation or be knocked off by the wind turbine during wind turbine hoisting.
[0056] In the above embodiment, along the axial direction of the main shaft 120, there can be a gap 140 between the bottom of the limiting member 132 and the second countersunk hole 111. During the installation of the limiting member 132, this gap 140 provides adjustment space for the docking of the hub 110 and the main shaft 120, offsetting the unavoidable minor errors during manufacturing and assembly, making it easier and more accurate to align the hub 110 and the main shaft 120 when connected, thus improving installation efficiency. It is understood that during equipment operation, the wind turbine generator set will experience axial vibration and displacement due to factors such as variable wind force. At this time, the gap 140 can provide necessary buffering for such axial movement, avoiding direct rigid contact between the limiting member 132 and the bottom of the second countersunk hole 111, thereby reducing component wear. In addition, the spacing 140 can effectively prevent the limiting part 132 from hitting the bottom of the second countersunk hole 111 due to manufacturing errors, thereby affecting the fit between the main shaft 120 and the hub 110. This ensures a tight fit between the connecting surfaces, guarantees the stability of the connection, and further improves the reliability of the entire connection structure.
[0057] In the above embodiment, the spacing 140 along the axial direction of the main shaft 120 is greater than or equal to 2mm. This effectively offsets unavoidable minor errors, allowing the connecting surfaces to fit more tightly, thus ensuring the stability of the entire connection structure. Simultaneously, during installation, this spacing 140 facilitates adjustments, making it easier to align the hub 110 and the main shaft 120, improving installation efficiency. Furthermore, during equipment operation, this spacing 140 buffers axial vibration and displacement, preventing rigid collisions between the limiting member 132 and the bottom of the second countersunk hole 111, thereby reducing component wear and extending equipment lifespan. If the spacing 140 is too small, manufacturing and assembly errors cannot be effectively offset, potentially causing the limiting member 132 to prematurely contact the bottom of the second countersunk hole 111, preventing a tight fit between the connecting surfaces of the main shaft 120 and the hub 110, reducing the stability of the connection structure. Moreover, an excessively small spacing 140 significantly weakens the buffering effect, making it prone to rigid collisions between the limiting member 132 and the bottom of the countersunk hole when facing axial vibrations and displacements generated during equipment operation, accelerating component wear and shortening the normal service life of the equipment. If the spacing of 140 is too large, although there is more room for adjustment, it may cause excessive stress at the root of the fillet inside the countersunk hole, increasing the risk of equipment failure.
[0058] In the above embodiments, a gap can be provided between the limiting member 132 and the sidewalls of the first countersunk hole 121 and the second countersunk hole 111. This gap can be smaller than the gap between the bolt 131 and the second connecting hole 112. This ensures that even if the outer contour of the limiting member is tightly fitted to the periphery of the second countersunk hole 111 during machine operation, the bolt 131 will not come into contact with the second connecting hole 112, ensuring that the bolt 131 does not generate shear stress during operation. This gap also makes the installation process smoother, preventing the limiting member 132 from getting stuck with the countersunk hole sidewall. Moreover, if disassembly and maintenance of the equipment are required later, this gap also makes it easier to remove the limiting member 132, greatly improving the efficiency of installation and disassembly. Secondly, during equipment operation, this gap can also accommodate the thermal expansion and contraction of components due to temperature changes. In this way, the limiting member 132 and the countersunk hole sidewall will not squeeze each other due to thermal expansion, thereby avoiding possible deformation or damage to the components. At the same time, this gap will not affect the key function of the limiting member 132 in preventing the hub 110 and the main shaft 120 from sliding relative to each other in the circumferential direction, and can well ensure the stability of the connection structure.
[0059] In the above embodiments, the bottom edges of the first countersunk hole 121 and the second countersunk hole 111 can be rounded corners 150. This rounded corner structure 150 avoids sharp right angles or burrs at the bottom edges of the countersunk holes. During the installation of the limiting member 132, it reduces collisions and friction with the edge of the countersunk hole, preventing scratches on the surface of the limiting member 132 and making the installation process smoother and safer. Secondly, during equipment operation, the rounded corners at the bottom edges of the countersunk holes disperse stress. When the limiting member 132 experiences axial vibration or is subjected to force, the rounded corner structure 150 prevents stress concentration at the right angles of the countersunk hole edge, reducing the possibility of cracks or damage to the countersunk hole edge due to long-term stress concentration. This protects the structural integrity of the main shaft 120 and the hub 110, extending the service life of the components.
[0060] In the above embodiments, the depth of the second countersunk hole 111 can be greater than the depth of the first countersunk hole 121. The deeper second countersunk hole 111 provides more ample space for the limiting member 132, ensuring that its axial position is properly arranged when assembled with the main shaft 120 and the hub 110. This prevents insufficient space from affecting the fit with the first countersunk hole 121 and provides sufficient structural foundation for the limiting member 132 to prevent relative slippage in the circumferential direction, ensuring the stable functioning of the limiting member 132. During equipment operation, when the hub 110 and the main shaft 120 experience minor axial displacement or vibration due to changes in operating conditions, the deeper second countersunk hole 111 provides greater buffering margin for this movement, preventing the limiting member 132 from prematurely contacting the bottom of the second countersunk hole 111 during axial movement. Furthermore, the design of the distance 140 between the limiting member 132 and the bottom of the second countersunk hole 111 enhances the buffering effect against axial vibration, reduces rigid collisions between components, and protects structural integrity. In addition, the deeper second countersunk hole 111 allows the part of the hub 110 that mates with the limiting member 132 to have a more reasonable wall thickness and structural strength. When the limiting member 132 transmits torque or bears external force, it can better disperse stress and avoid the problem of insufficient strength due to the local structure being too thin, thereby improving the overall load-bearing capacity of the connection between the hub 110 and the main shaft 120.
[0061] like Figure 7 and Figure 8 As shown in the above embodiment, the cross-section of the limiting member 132 along the radial direction of the main shaft 120 can be circular or square. It can be understood that a circular cross-section provides more even contact with the inner wall of the countersunk hole. When the hub 110 and the main shaft 120 tend to slip relative to each other, the circular limiting member 132 can evenly bear the force on its outer circumferential surface, ensuring a more stable effect in preventing relative slippage. Simultaneously, the circular structure is easier to manufacture, can more efficiently guarantee dimensional accuracy, is suitable for mass production, and does not require deliberate alignment during installation, simplifying the assembly process and improving installation efficiency. If the cross-section is square, its corners have a clear directionality, providing stronger torsional resistance at specific angles. The adjacent sides of a square cross-section form right angles, and the cooperation with the inner wall of the countersunk hole can form a more stable circumferential limiting, especially in scenarios requiring precise transmission of directional torque. It can more directly contact the countersunk hole sidewall through its corners, quickly responding to and preventing relative rotation between the hub 110 and the main shaft 120, making it suitable for connection structures with high circumferential positioning accuracy requirements. Furthermore, the square cross-section allows for planar positioning during machining, facilitating dimensional inspection and precision control during manufacturing to ensure that the fit clearance with the countersunk hole meets design standards. Of course, the cross-section of the limiting member 132 can also be other shapes; no restrictions are placed here.
[0062] like Figure 9As shown in the above embodiment, the limiting member 132 and the bolt 131 can be integrally formed. This integral structure avoids assembly gaps and weak points in the connection between the limiting member 132 and the bolt 131, making them a single, integrated load-bearing unit. When the hub 110 and the main shaft 120 experience relative slippage or bear torque, the force can be directly transmitted through the integrated structure, reducing stress dispersion or excessive local stress that may occur with separate connections. This significantly improves the overall load-bearing capacity and torsional resistance, ensuring that the limiting member 132 and the bolt 131 are less prone to breakage or loosening under complex working conditions. Secondly, the integral forming process requires only one installation operation to complete the positioning and fixing of both, reducing assembly steps and adjustment time, making the installation process more efficient and convenient, especially suitable for mass production or rapid assembly of large equipment. Furthermore, the one-time forming process allows for more precise control of the dimensional and geometric tolerances of the limiting member 132 and the bolt 131, ensuring their coaxiality or positional accuracy, reducing fitting problems in subsequent assembly, and improving the overall structural processing quality.
[0063] Furthermore, this application embodiment also provides a wind turbine generator set, including the wind turbine generator set hub-main shaft connection structure 100 of the above embodiment. The wind turbine generator set hub-main shaft connection structure 100 includes a hub 110, a main shaft 120, and connecting components 130. The hub 110 is connected to one end of the main shaft 120 axially through multiple connecting components 130. The end of the main shaft 120 along its own axial direction has a first countersunk hole 121. The bottom of the first countersunk hole 121 has a first connecting hole 122 with a diameter smaller than the first countersunk hole 121. The end of the hub 110 facing the main shaft 120 has a first connecting hole 122 with a diameter smaller than the first countersunk hole 121. The second countersunk hole 111 has a second connecting hole 112 at its bottom with a diameter smaller than that of the second countersunk hole 111; the connecting assembly 130 includes a bolt 131 and a limiting member 132, the limiting member 132 having a mounting hole, a part of the limiting member 132 being installed in the first countersunk hole 121, and the other part of the limiting member 132 being installed in the second countersunk hole 111, the first connecting hole 122, the mounting hole and the second connecting hole 112 being opposite to and connected along the axial direction of the main shaft 120, and the bolt 131 being threadedly connected to the first connecting hole 122, the mounting hole and the second connecting hole 112. When the hub 110 tends to slip relative to the main shaft 120, the limiting member 132 installed in the first countersunk hole 121 of the main shaft 120 and the second countersunk hole 111 of the hub 110 can ensure the relative position of the hub 110 and the main shaft 120 in the circumferential direction, effectively preventing the hub 110 and the main shaft 120 from slipping relative to each other. This effectively protects the bolt 131, preventing the bolt 131 from directly bearing shear force and extending the service life of the bolt 131. Moreover, this solution can achieve a reliable connection between the hub 110 and the main shaft 120 through the simple structural design of the countersunk hole and the limiting member 132, improving the reliability of the wind turbine and reducing the cost of the wind turbine.
[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A wind turbine hub main shaft connection structure (100), characterized in that, The assembly includes a hub (110), a main shaft (120), and connecting components (130). The hub (110) is connected to one axial end of the main shaft (120) via multiple connecting components (130). The main shaft (120) has a first countersunk hole (121) at its axial end. The bottom of the first countersunk hole (121) has a first connecting hole (122) with a diameter smaller than that of the first countersunk hole (121). The end of the hub (110) facing the main shaft (120) has a second countersunk hole (111). The bottom of the second countersunk hole (111) has a second connecting hole (112) with a diameter smaller than that of the second countersunk hole (111). The connecting assembly (130) includes a bolt (131) and a limiting member (132). The limiting member (132) has a mounting hole. A portion of the limiting member (132) is mounted in the first countersunk hole (121), and another portion of the limiting member (132) is mounted in the second countersunk hole (111). The first connecting hole (122), the mounting hole, and the second connecting hole (112) are opposite to and communicate with each other along the axial direction of the main shaft (120). The bolt (131) is threaded into the first connecting hole (122), the mounting hole, and the second connecting hole (112) to connect the hub (110) and the main shaft (120) together.
2. The wind turbine hub main shaft connection structure (100) according to claim 1, characterized in that, The bottom of the first countersunk hole (121) also has a third connecting hole (123), which is located around the first connecting hole (122). The limiting member (132) has a fourth connecting hole (1321) corresponding to the position of the third connecting hole (123). The connecting assembly (130) also includes a screw (133), which is threaded to the fourth connecting hole (1321) and the third connecting hole (123) to fix the limiting member (132) in the first countersunk hole (121).
3. The wind turbine hub main shaft connection structure (100) according to claim 2, characterized in that, Along the axial direction of the main shaft (120), there is a gap (140) between the limiting member (132) and the bottom of the second countersunk hole (111).
4. The wind turbine hub main shaft connection structure (100) according to claim 3, characterized in that, The dimension of the spacing (140) along the axial direction of the main shaft (120) is greater than or equal to 2 mm.
5. The wind turbine hub main shaft connection structure (100) according to claim 4, characterized in that, There is a gap between the limiting member (132) and the side wall of the first countersunk hole (121) and the side wall of the second countersunk hole (111).
6. The wind turbine hub main shaft connection structure (100) according to claim 5, characterized in that, The bottom edges of the first countersunk hole (121) and the second countersunk hole (111) are rounded (150).
7. The wind turbine hub main shaft connection structure (100) according to claim 6, characterized in that, The depth of the second countersunk hole (111) is greater than the depth of the first countersunk hole (121).
8. The wind turbine hub main shaft connection structure (100) according to any one of claims 1-7, characterized in that, The limiting member (132) has a circular or square cross section along the radial direction of the main axis (120).
9. The wind turbine hub main shaft connection structure (100) according to any one of claims 1-7, characterized in that, The limiting member (132) and the bolt (131) are integrally formed.
10. A wind turbine generator set, characterized in that, Includes the wind turbine hub main shaft connection structure (100) as described in any one of claims 1-9.