Hub and wind wheel

Abstract

The utility model relates to the technical field of wind turbine generators, and provides a hub and a wind wheel, and the hub comprises a shell, a metal transition ring and a web plate. A variable pitch bearing flange is arranged on the outer wall of the shell in a protruding mode, and a mounting hole is defined by the variable pitch bearing flange. The metal transition ring is connected to the inner wall of the mounting hole. The web is connected to the inner edge of the metal transition ring. Moreover, the web comprises a skin layer and a sandwich layer, the sandwich layer is coated with the skin layer, and a plurality of honeycomb holes are distributed in the sandwich layer in an array mode. Therefore, the weight of the web plate can be obviously reduced by replacing the original solid web plate with the hollow structure formed by the thin skin and the honeycomb sandwich layer, so that the weight of the hub is reduced.

Description

Technical Field

[0001] This application relates to the field of wind turbine technology, and in particular to a hub and a wind turbine. Background Technology

[0002] As wind turbines develop towards larger capacity and larger blades, the size and weight of the hubs are also increasing significantly. In current technology, wind turbine hubs typically use solid ductile iron webs of uniform thickness. Ductile iron has a high density, and this design significantly increases the overall weight of the hub, leading to increased costs for conventional transportation and installation, and greatly increasing construction complexity. Furthermore, as a core load-bearing component, the excessive weight of the hub indirectly increases the cost of supporting structures such as the tower and foundation.

[0003] Therefore, a lightweight wheel design is urgently needed. Utility Model Content

[0004] This application provides a hub and a wind turbine to solve the problem in the prior art that the large weight of the wind turbine hub leads to increased transportation costs and installation difficulties.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] The first aspect of this application provides a wheel hub, comprising: a housing, wherein a pitch bearing flange protrudes from the outer wall of the housing, the pitch bearing flange forming a mounting hole; a metal transition ring, the metal transition ring being connected to the inner wall of the mounting hole; a web, the web being connected to the inner edge of the metal transition ring; and the web comprising a skin layer and a core layer, the skin layer covering the core layer; and the core layer having a plurality of honeycomb holes arranged in an array.

[0007] As an alternative implementation, the web also includes trusses disposed within the honeycomb holes.

[0008] As an alternative implementation, the truss includes at least three support rods; the first ends of each support rod converge at the center of the honeycomb hole, and the second ends of each support rod are connected to different inner walls of the honeycomb hole.

[0009] As an alternative implementation, the truss further includes a support ball located at the first end of each support rod and wrapped around the end of each support rod.

[0010] As an alternative implementation, the thickness of the skin layer gradually decreases from the wall of the mounting hole to the center of the mounting hole.

[0011] As an optional implementation, the thickness variation rate of the skin layer is 1% to 5%.

[0012] As an alternative implementation, the wall thickness of the honeycomb holes gradually decreases from the hole wall to the center of the hole; and / or, the cross-sectional area of ​​the honeycomb holes gradually increases.

[0013] As an alternative implementation, the diameter of the support rod gradually decreases from the wall of the mounting hole to the center of the mounting hole.

[0014] As an optional implementation, a weight reduction hole is provided on the housing. The weight reduction hole is elliptical and is located on the housing between two adjacent pitch bearing flanges.

[0015] A second aspect of this application also provides a wind turbine, which includes blades, a main shaft, and a hub as described above.

[0016] The hub and wind turbine provided in this application include a housing, a metal transition ring, and a web. The outer wall of the housing has a protruding pitch bearing flange that forms a mounting hole. The metal transition ring is connected to the inner wall of the mounting hole. The web is connected to the inner edge of the metal transition ring. Furthermore, the web includes a skin layer and a core layer, with the skin layer covering the core layer, and the core layer having an array of multiple honeycomb holes.

[0017] In this way, by replacing the original solid web with a hollow structure formed by a thin skin and a honeycomb core layer, the weight of the web can be significantly reduced, thereby reducing the weight of the hub. Furthermore, the hexagonal structure of the honeycomb core can disperse stress, significantly improving its bending and torsional stiffness, making it particularly suitable for scenarios where the hub bears pitch torque. In addition, by setting a metal transition ring connecting the mounting hole and the web, a rigid connection frame can be formed, which can be used to bear concentrated loads that may occur when the hub and blades are connected and to ensure connection accuracy. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the wind turbine structure provided in an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the structure of a wheel hub provided in an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the web structure provided in an embodiment of this application;

[0022] Figure 4This is a schematic diagram of a truss structure provided in an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of another truss structure provided in an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of another truss structure provided in an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of another truss structure provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Wind turbine;

[0028] 10 - Hub; 20 - Blade; 30 - Main shaft;

[0029] 100 - Housing; 110 - Pitch bearing flange; 120 - Weight reduction hole; 130 - Main shaft connection end; 140 - Shielding connection end;

[0030] 200-Metal transition ring;

[0031] 300-Web plate; 310-Skin layer; 311-Upper skin; 312-Lower skin; 320-Sandwich layer; 321-Honeycomb hole; 330-Truss; 331-Support rod; 332-Support sphere. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, 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. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] As wind turbines develop towards larger capacity and larger blades, the size of the blades connecting the rotor and the hub of the main shaft will also increase significantly.

[0034] In existing technologies, wind turbine hubs typically use solid ductile iron webs of uniform thickness. Ductile iron has a high density, and this design significantly increases the overall weight of the hub, leading to increased costs for conventional transportation and installation, and greatly enhancing construction complexity. Furthermore, as a core load-bearing component, the excessive weight of the hub places higher demands on the tower and foundation supporting the wind turbine, indirectly increasing the cost of the tower, foundation, and other supporting structures.

[0035] In view of this, this application provides a hub and a wind turbine. The hub includes a housing, a metal transition ring, and a web. A pitch bearing flange protrudes from the outer wall of the housing, forming a mounting hole. The metal transition ring is connected to the inner wall of the mounting hole. The web is connected to the inner edge of the metal transition ring. Furthermore, the web includes a skin layer and a core layer, with the skin layer covering the core layer, and the core layer having an array of multiple honeycomb holes.

[0036] In this way, by replacing the original solid web with a hollow structure formed by a thin skin and a honeycomb core layer, the weight of the web can be significantly reduced, thereby reducing the weight of the hub. Furthermore, the hexagonal structure of the honeycomb core can disperse stress, significantly improving bending and torsional stiffness, making it particularly suitable for scenarios where the hub bears pitch torque. In addition, by setting a metal transition ring connecting the mounting hole and the web, a rigid connection frame can be formed, which can be used to bear concentrated loads that may occur when connecting to the blades and ensure connection accuracy.

[0037] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0038] Figure 1 This is a schematic diagram of the wind turbine structure provided in an embodiment of this application. (Refer to...) Figure 1 As shown, this application provides a wind turbine 1, which includes blades 20, a hub 10, and a main shaft 30. Three blades 20 are connected to the hub 10, and the three blades 20 are arranged at 120° angles along the circumference of the hub 10. The blades 20 can capture wind energy through their aerodynamic shape. Under the action of wind, the blades 20 begin to rotate and can drive the hub 10 to rotate accordingly. The main shaft 30 is connected to the hub 10 and can rotate under the drive of the hub 10.

[0039] Understandably, to further optimize energy capture by the blade 20, the blade 20 can be mounted on the hub 10 via a pitch bearing (not shown). Specifically, the outer ring of the pitch bearing is connected to the hub 10, and the blade 20 is mounted on the inner ring of the pitch bearing, which can rotate relative to the outer ring. When the inner ring of the pitch bearing rotates relative to the outer ring, the blade 20 can rotate relative to the hub 10.

[0040] The following provides a detailed description of the specific structure of the wheel hub 10 in the embodiments of this application and various possible implementation methods.

[0041] Figure 2 This is a schematic diagram of the structure of a wheel hub provided in an embodiment of this application. Figure 3 This is a schematic diagram of the web structure provided in an embodiment of this application.

[0042] Reference Figure 2 and Figure 3 As shown, this application provides a hub 10, which includes a housing 100. A pitch bearing flange 110 protrudes from the outer wall of the housing 100, and the pitch bearing flange 110 forms a mounting hole (not shown). The mounting hole can be used to install wind turbine blades 20.

[0043] It is understandable that, corresponding to the number of blades 20, three pitch bearing flanges 110 can be provided, and the three pitch bearing flanges 110 are symmetrically arranged along the circumference of the housing 100, with adjacent pitch bearing flanges 110 being evenly distributed at an included angle of 120°.

[0044] The hub 10 also includes a metal transition ring 200 and a web 300. The metal transition ring 200 is connected to the inner wall of the mounting hole, and the web 300 is connected to the inner edge of the metal transition ring 200. The web 300 includes a skin layer 310 and a core layer 320, with the skin layer 310 covering the core layer 320. The core layer 320 has an array of multiple honeycomb holes 321. The honeycomb holes 321 can be hexagonal. The core layer 320 has multiple honeycomb cells. The skin layer 310 and the core layer 320 can be connected via structural adhesive through surface contact.

[0045] The sandwich layer 320 is composed of multiple hexagonal honeycomb holes 321, with a porosity of over 90%. Compared with solid webs (such as a single piece of metal or composite material), the sandwich layer 320 can reduce the mass of the same volume by 50%-80%, significantly reducing the self-weight of the hub 10, thereby reducing the driving energy consumption of the blades 20 and the load-bearing pressure on the tower.

[0046] Furthermore, the walls of the honeycomb holes 321 form a three-dimensional stress grid through mutual support. When subjected to axial pressure (such as the force transmitted from the blade 20 thrust to the hub 10) and bending load (the bending moment generated by the weight of the hub 10 itself), the load can be diffused along the walls of the honeycomb holes 321 to the entire cross-section, allowing the structure to maintain high overall stiffness and strength while being lightweight. This is especially suitable for scenarios where the hub 10 bears pitch torque.

[0047] By replacing the original solid web with a honeycomb core web, the weight of the web 300 can be significantly reduced while maintaining the strength of the hub 10, thus achieving weight reduction for the hub 10. Furthermore, the metal transition ring 200 can bear the concentrated load transmitted from the pitch bearing flange 110, and through the connection between the metal transition ring 200 and the web 300, such as welding or bonding the skin to the inner edge of the layered metal ring, the load is distributed to the sandwich web 300.

[0048] In this way, the metal transition ring 200 can withstand the concentrated load transmitted by the pitch bearing through its own high strength, avoiding local stress exceeding the bearing capacity limit of the web 300, and also preventing the honeycomb structure at the edge of the web 300 from being crushed or sheared by local stress. Furthermore, the outer wall of the metal ring can be precision machined according to the actual dimensions of the flange mounting hole (e.g., with a slight interference fit) to ensure a close fit with the inner wall of the mounting hole. The inner edge can be adjusted according to the actual outer edge dimensions of the sandwich web 300, eliminating assembly gaps through tolerance compensation, ensuring the coaxiality and perpendicularity of the connection, and thus ensuring connection accuracy.

[0049] Understandably, the metal transition ring 200 can be made of ductile iron, high-strength alloy steel (42CrMo, 35CrMo, 40CrNiMoA), or titanium alloy. Using these high-rigidity materials can ensure more reliable local strength (such as resistance to bolt preload and shear force) at the connection with the blade 20.

[0050] In one implementation, an annular groove can be formed on the inner wall of the mounting hole. The metal transition ring 200 can be inserted into the annular groove through an interference fit, achieving a rigid connection between the pitch bearing flange 110 and the metal transition ring 200. This optimizes load transfer through surface contact and uniform circumferential force distribution, reducing localized stress concentration. Furthermore, multi-directional constraints and clearance elimination enhance the stability of the connection.

[0051] As another implementation, when the metal transition ring 200 and the housing 100 are made of the same material, the metal transition ring 200 and the housing 100 can also be integrally formed.

[0052] Furthermore, the metal transition ring 200 and the pitch bearing flange 110 can be fixedly connected by bolts. Specifically, multiple bolts distributed circumferentially can pass perpendicularly through the sidewalls of the pitch bearing flange 110 and the metal transition ring 200.

[0053] In this way, the direction of the bolt force is perpendicular to the mating surface of the metal ring and the flange, which can effectively counteract the relative radial displacement between the two, while avoiding excessive shear force on the bolt. This is suitable for scenarios such as wind turbine hubs 10 that require high-frequency variable loads.

[0054] In some embodiments, the metal transition ring 200 and the web 300 can be connected by a stop fit. For example, the outer edge of the metal transition ring 200 is provided with a convex stop (outer convex step) or a concave stop (inner concave groove), and correspondingly, a stop fit part (inner concave groove or outer convex step) is provided on the outer wall of the web 300.

[0055] Building upon this, the connection between the two can be further strengthened by combining adhesive bonding or partial bolting. This improves positioning accuracy, facilitates assembly, and avoids stress concentration caused by assembly deviations.

[0056] Understandably, the skin layer 310 can be made of metal, carbon fiber, or glass fiber composite materials. Compared to metal, carbon fiber or glass fiber composite materials have better tensile strength.

[0057] To further reduce weight, the thickness of the skin layer 310 can gradually decrease from the wall of the mounting hole to the center of the mounting hole. Correspondingly, along the radial direction of the web 300, the thickness of the skin near the end of the metal transition ring 200 is greater than the thickness of the skin at the center of the web 300.

[0058] Understandably, the pitch bearing flange 110 is the "main load input point" of the hub 10 web 300. The load can be transferred to the hub 10 housing 100 through the pitch bearing flange 110, and then to the web 300 through the metal transition ring 200, and further transferred to the housing 100. The skin layer 310 is the main contributor to the weight of the web 300. Thinning the skin in the low-stress central area can reduce the amount of skin material used by 20%-30% without affecting the overall strength.

[0059] It should be noted that the skin layer 310 includes an upper skin 311 and a lower skin 312. The thickness of the upper skin 311 and the lower skin 312 should decrease in the same direction, such as proportionally or with the same gradient, to avoid asymmetric stress caused by unilateral gradual change.

[0060] As one implementation method, the thickness variation rate of the skin layer 310 can be 1% to 5%.

[0061] The thickness variation rate refers to the reduction in thickness per unit length along the radial direction of the web 300 from its edge to its center (Δt = t1 - t2, where t1 is the edge thickness, t2 is the center thickness, and ΔL is the length), i.e., the variation rate k = Δt / ΔL (unit: mm / mm, or %). That is, the thickness of the skin layer 310 can be reduced by 1-5 mm per 100 mm radial length.

[0062] For example, when the skin layer 310 is made of metal, the thickness change rate can be 0.01 mm / mm (1%). Since the skin layer 310 is made of metal, it is more sensitive to sudden changes in thickness. If the change rate is too large, it will lead to local stress concentration and welding defects during processing. Therefore, it should not change too quickly.

[0063] Alternatively, to avoid the thickness change of the skin layer 310 being too gradual and failing to achieve the weight reduction goal, the thickness change rate can also be 0.03 mm / mm (3%). In this case, both the material waste caused by the excessively gradual thickness change and the stress concentration factor exceeding the safety threshold of metal fatigue design (generally 1.5) caused by the rapid reduction in thickness can be avoided. That is to say, the change rate of the metal skin layer 310 can range from 0.01 mm / mm (1%) to 0.03 mm / mm (3%).

[0064] When the skin layer 310 is a composite material, such as carbon fiber reinforced resin matrix composite, it has a greater advantage in terms of lightweighting. Since the composite skin achieves thickness variation through gradual layup changes, its formability is superior to metal. However, it is necessary to control the risk of interlaminar delamination and avoid uneven layup stacking and a surge in interlaminar shear stress caused by excessive thickness variation rate. In this case, the thickness variation rate can be less than or equal to 0.05 mm / mm (5%). Specifically, the thickness variation rate range can be 0.02 mm / mm (2%) to 0.05 mm / mm (5%).

[0065] In one implementation, the wall thickness of the honeycomb hole 321 can gradually decrease from the hole wall to the center of the mounting hole. And / or, the cross-sectional area of ​​the honeycomb hole 321 can gradually increase.

[0066] For example, the honeycomb wall near the metal transition ring 200 can be relatively thick, thereby enhancing the shear bearing capacity of the honeycomb wall itself, preventing wall buckling, and matching larger shear forces. Furthermore, the cross-sectional area (cell size) of the honeycomb cells 321 can be smaller, resulting in high honeycomb wall density, strong resistance to shear deformation, and the ability to transmit larger shear stresses.

[0067] As the honeycomb wall extends from the edge towards the center of the web 300, it can gradually thin out. At this point, the thin-walled honeycomb can meet the shear resistance requirements while reducing weight. Furthermore, the cross-sectional area of ​​the honeycomb cells 321 can gradually increase. The large-sized cell honeycomb wall has a low density and reduced shear stiffness, which can be matched to small shear stresses, while reducing material usage and achieving lightweighting.

[0068] Figure 4 This is a schematic diagram of a truss structure provided in an embodiment of this application. Figure 5 This is a schematic diagram of another truss structure provided in an embodiment of this application.

[0069] Reference Figure 4 and Figure 5As shown, the web 300 may also include a truss 330, which is disposed within the honeycomb holes 321. This arrangement of the truss 330 enhances the local shear and compressive strength of the web 300 to withstand the dynamic load impact of the hub 10. Furthermore, it can suppress buckling deformation of the honeycomb hole 321 walls, thereby increasing overall stiffness.

[0070] Understandably, when the wind turbine is running, the hub 10 needs to bear the periodic aerodynamic load transmitted by the blades 20, its own weight, and the centrifugal force of rotation. These forces will pass through the sandwich web 300, causing the pore walls of the honeycomb structure to be subjected to shear force (the tendency of the pore walls to shift due to the load difference on both sides) and local pressure (the squeezing effect of the load concentration area) for a long time, which can easily cause the honeycomb pores 321 to buckle or tear locally.

[0071] The truss 330 structure can divide the bore wall into smaller stress units. Through the truss 330, shear force and pressure can be transferred to a larger range of bore walls, significantly improving the shear strength and compressive stability of the bore walls and avoiding structural failure caused by dynamic load impact.

[0072] It should be noted that the truss 330 may be provided only in a portion of the honeycomb holes 321 in the sandwich layer. For example, due to the relatively small stress, the honeycomb holes 321 in the central region of the web 300 may not have the truss 330 provided. The truss 330 may also be provided in all the honeycomb holes 321, depending on the load that the web 300 needs to bear, and no limitation is made here.

[0073] As one implementation method, the truss 330 can be made of high-strength aluminum alloy or titanium alloy to ensure that the truss 330 can maintain structural stability when subjected to large loads.

[0074] For example, the truss 330 may include at least three support rods 331. The first ends of each support rod 331 converge at the center of the honeycomb hole 321, and the second ends of each support rod 331 are connected to different inner sidewalls of the honeycomb hole 321. It should be noted that the convergence point of the first ends of each support rod 331 can be located at any height plane between the upper and lower skins. For example, the convergence point of the first ends of each support rod 331 may be near the upper skin 311, near the lower skin 312, or centrally located.

[0075] For example, such as Figure 4 As shown, the truss 330 includes three support rods 331, which can be spaced apart and connected to the inner walls of the honeycomb holes 321 in three different directions. In this way, the three non-coplanar support rods 331 are symmetrically distributed at 120°, which can naturally form a three-dimensional balanced force system, thereby forming a spatial triangular support and distributing the load to the corresponding inner walls, reducing local stress.

[0076] like Figure 5 As shown, the truss 330 may include six support rods 331, which are connected to the six inner walls corresponding to the honeycomb holes 321. Similarly, the six non-coplanar support rods 331 can form a spatially symmetrical structure, so that the load can be distributed to the six inner wall connection points through six paths. The force at a single point is only 1 / 6 of the total load, and the local stress is small. Furthermore, even if one or two support rods 331 fail, the remaining support rods 331 can still maintain basic support, with strong redundancy.

[0077] In some embodiments, the support rod 331 may be a hollow structure, or the support rod 331 may be made of titanium alloy material, so as to reduce the impact on the weight of the web 300 and the wheel hub 10 while improving strength.

[0078] As one implementation method, the diameter of the support rod 331 can be gradually reduced from the wall of the mounting hole to the center of the mounting hole. In this way, the rod diameter can be reasonably adjusted according to the stress borne by the web plate 300, thereby achieving further weight reduction of the web plate 300.

[0079] To reduce stress, the connection end between the support rod 331 and the inner wall of the honeycomb hole 321 can be transitioned by an arc. Alternatively, a ball joint connection can be provided at the end of the support rod 331 near the inner wall of the honeycomb hole 321.

[0080] Figure 6 This is a schematic diagram of another truss structure provided in an embodiment of this application. Figure 7 This is a schematic diagram of another truss structure provided in an embodiment of this application.

[0081] Reference Figure 6 and Figure 7 As shown, the truss 330 may also include a support ball 332. The support ball 332 is located at the first end of each support rod 331 and is wrapped around the end of each support rod 331.

[0082] In this way, by adding an integral or segmented spherical node, the line contact of the three support rods 331 can be transformed into a uniform diffusion from point to surface, significantly reducing stress concentration at the intersection. Furthermore, since the sphere itself has isotropic stiffness, it can simultaneously withstand tension, compression, shear, and torsion, improving the adaptability of the truss 330 to the overturning moment of the pitch bearing.

[0083] In some embodiments, a weight-reducing hole 120 may be provided on the support sphere 332, or the support sphere 332 may be configured as a hollow sphere to reduce its weight.

[0084] As one implementation method, an inspection hole can be provided at the center of the web 300. This maintains the symmetry of the circular web 300, avoids load distribution imbalance caused by eccentric opening, further reduces the weight of the web 300, and avoids high-stress areas, which is beneficial for subsequent wind turbine maintenance and personnel inspection.

[0085] Continue to refer to Figure 2 As shown, to further reduce the weight of the hub 10, a weight-reduction hole 120 can be provided on the housing 100. The weight-reduction hole 120 is elliptical in shape and is located on the housing 100 between two adjacent pitch bearing flanges 110. This further reduces the weight of the hub 10. Furthermore, setting the shape of the weight-reduction hole 120 to elliptical reduces stress concentration.

[0086] For example, the weight-reduction hole 120 can be a blind hole. The depth of the blind hole is d1, the total wall thickness of the shell 100 at the opening is D, and the remaining wall thickness is d2. Furthermore, 0.30D≤d1≤0.50D, and correspondingly, 0.50D≤d2≤0.70D. This setting ensures that the remaining wall thickness is sufficient to withstand the ultimate load while maximizing the weight-reduction effect.

[0087] In some embodiments, the housing 100 is further provided with a main shaft connection end 130 and a flow guide connection end 140, with the main shaft connection end 130 and the flow guide connection end 140 being disposed opposite to each other.

[0088] Multiple weight reduction holes 120 can be provided. One weight reduction hole 120 can be provided between two adjacent pitch bearing flanges 110, on the side of housing 100 near the main shaft connection end 130, and on the side of housing 100 near the fairing connection end 140. Furthermore, two weight reduction holes 120 can be symmetrically arranged along the centerline of the mounting hole, so as to maintain the center of mass and inertial balance of housing 100.

[0089] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0090] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0091] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0092] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0093] 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 wheel hub, characterized in that, include: The housing (100) has a pitch bearing flange (110) protruding from its outer wall, and the pitch bearing flange (110) forms a mounting hole; A metal transition ring (200) is connected to the inner wall of the mounting hole; A web (300) is connected to the inner edge of the metal transition ring (200); and the web (300) includes a skin layer (310) and a core layer (320), the skin layer (310) covering the core layer (320); the core layer (320) is arrayed with a plurality of honeycomb holes (321).

2. The wheel hub according to claim 1, characterized in that, The web (300) also includes a truss (330) disposed within the honeycomb holes (321).

3. The wheel hub according to claim 2, characterized in that, The truss (330) includes at least three support rods (331); the first end of each support rod (331) is converging at the center of the honeycomb hole (321), and the second end of each support rod (331) is connected to a different inner wall of the honeycomb hole (321).

4. The wheel hub according to claim 3, characterized in that, The truss (330) also includes: A support ball (332) is located at the first end of each of the support rods (331) and is wrapped around the end of each of the support rods (331).

5. The wheel hub according to any one of claims 1-4, characterized in that, The thickness of the skin layer (310) gradually decreases from the wall of the mounting hole to the center of the mounting hole.

6. The wheel hub according to claim 5, characterized in that, The thickness variation rate of the skin layer (310) is 1% to 5%.

7. The wheel hub according to any one of claims 1-4, characterized in that, From the wall of the mounting hole to the center of the mounting hole, the wall thickness of the honeycomb hole (321) gradually decreases; And / or, the cross-sectional area of ​​the honeycomb pores (321) gradually increases.

8. The wheel hub according to claim 3, characterized in that, The diameter of the support rod (331) gradually decreases from the wall of the mounting hole to the center of the mounting hole.

9. The wheel hub according to any one of claims 1-4, characterized in that, The housing (100) has a weight reduction hole (120) which is elliptical and is located on the housing (100) between two adjacent pitch bearing flanges (110).

10. A wind turbine, characterized in that, It includes blades (20), a main shaft (30), and a hub (10) as described in any one of claims 1-9.

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