Gearbox connection structure and wind turbine

Abstract

The application discloses a gear box connecting structure and a wind driven generator, wherein the gear box connecting structure comprises a planetary shaft, a planet carrier and a expansion sleeve, the planet carrier is provided with an assembly hole, and the planetary shaft is arranged in the assembly hole; one end of the planet carrier is further provided with a locking hole, the locking hole is coaxially arranged with the assembly hole, the locking hole is communicated with the assembly hole, and the inner wall surface of the locking hole is provided with a first taper surface; the expansion sleeve is arranged on the outer wall surface of the planetary shaft and detachably arranged in the locking hole, the outer wall surface of the expansion sleeve is provided with a second taper surface matched with the first taper surface; when the expansion sleeve is embedded in the locking hole, the second taper surface is abutted with the first taper surface, so that the expansion sleeve presses the outer wall surface of the planetary shaft and the inner wall surface of the locking hole. The technical scheme provided by the application can increase the friction force among the planetary shaft, the expansion sleeve and the planet carrier, and effectively inhibit the axial movement and the circumferential rotation of the planetary shaft.

Description

Technical Field

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

[0002] The wind turbine gearbox is a key transmission component in a wind turbine that converts wind energy into mechanical energy. The reliability of the connection between the planet carrier and the planet shaft in its planetary transmission mechanism is crucial to the stable operation of the entire gearbox.

[0003] In existing technologies, the traditional connection between the planetary carrier and the planetary shaft mainly uses an interference fit. During gearbox operation, the planetary bearings are subjected to alternating loads and complex torques, which can easily lead to axial movement and circumferential micro-rotation. This results in decreased transmission accuracy, increased wear on the contact surfaces, and even gear meshing failure, seriously affecting the reliability and service life of the gearbox. Utility Model Content

[0004] The purpose of this application is to provide a gearbox connection structure and a wind turbine generator that can increase the friction between the planetary shaft, the shrink sleeve and the planetary carrier, and effectively suppress the axial movement and circumferential rotation of the planetary shaft.

[0005] In a first aspect, this utility model provides a gearbox connection structure, comprising: Planetary axis; The planetary carrier has an assembly hole in which the planetary shaft is installed; one end of the planetary carrier also has a locking hole, which is coaxial with the assembly hole and communicates with the assembly hole; the inner wall of the locking hole has a first conical surface. An expansion sleeve is fitted onto the outer wall surface of the planetary shaft, and the expansion sleeve is detachably disposed in the locking hole. The outer wall surface of the expansion sleeve is provided with a second conical surface that is adapted to the first conical surface. When the expansion sleeve is inserted into the locking hole, the second conical surface abuts against the first conical surface, causing the expansion sleeve to press against the outer wall surface of the planetary shaft and the inner wall surface of the locking hole.

[0006] Beneficial effects: In this gearbox connection structure, during the installation of the planetary carrier and planetary shaft, the expansion sleeve is first fitted onto the outer surface of the planetary shaft, and then the planetary shaft is installed into the mounting hole of the planetary carrier, ensuring that the expansion sleeve simultaneously enters the locking hole of the planetary carrier. When the expansion sleeve is inserted into the locking hole, because the inner wall of the locking hole has a first conical surface, and the expansion sleeve has a second conical surface that matches the first conical surface, during the process of the expansion sleeve being inserted into the locking hole, the expansion sleeve will move towards the interior of the planetary carrier along the axial direction of the locking hole. At this time, the second conical surface abuts against the first conical surface, causing the expansion sleeve to press against the outer wall of the planetary shaft and the inner wall of the locking hole, creating a certain interference fit, ensuring that the planetary shaft is firmly fixed in the mounting hole of the planetary carrier.

[0007] By adapting and abutting the second conical surface of the expansion sleeve with the first conical surface of the locking hole, the expansion sleeve can simultaneously press the outer wall surface of the planetary shaft and the inner wall surface of the locking hole during embedded assembly. The radial clamping force generated by the conical surface cooperation forms a stable constraint, increases the friction between the planetary shaft, the expansion sleeve and the planet carrier, effectively suppresses the axial movement and circumferential rotation of the planetary shaft, reduces the risk of planetary shaft displacement, avoids the decrease in transmission accuracy, the aggravation of contact surface wear and gear meshing failure, and significantly improves the operational reliability and service life of the gearbox.

[0008] In addition, compared to the shortcomings of traditional interference fits that rely on cold or hot fitting and require special equipment for disassembly, the expansion sleeve in this connection structure can be detached and installed in the locking hole. It does not require complex temperature control or destructive operations. The connection and separation of the planetary shaft and planetary carrier can be achieved by installing and removing the expansion sleeve, which simplifies the assembly process, reduces damage to the structure, and lowers the cost and difficulty of subsequent maintenance.

[0009] In one optional embodiment, the inner wall surface of the locking hole is further provided with a third conical surface, the third conical surface and the first conical surface are spaced apart along the axial direction of the locking hole, and the outer wall surface of the expansion sleeve is provided with a fourth conical surface that matches the third conical surface; When the expansion sleeve is inserted into the locking hole, the second conical surface abuts against the first conical surface, and the third conical surface abuts against the fourth conical surface.

[0010] Beneficial effects: By setting a first and a third conical surface on the inner wall of the locking hole, compared to a single set of conical surfaces, the two sets of conical surfaces are distributed axially, which can significantly increase the total contact area between the locking hole and the expansion sleeve. Based on the radial positive pressure generated by the conical surface fit, the larger contact area further enhances the friction between the two, effectively suppressing the axial movement and circumferential rotation of the planetary shaft, and avoiding a decrease in transmission accuracy due to displacement.

[0011] In one alternative implementation, the first conical surface is arranged parallel to the third conical surface.

[0012] Beneficial effects: The parallel arrangement of the first and third conical surfaces means that the cone angles of the two sets of conical surfaces are completely consistent. When the expansion sleeve is inserted into the locking hole, the two sets of conical surfaces will contact each other synchronously and generate radial force of the same magnitude. This can avoid the problem of one set of conical surfaces being subjected to excessive force and the other set being subjected to insufficient force due to the difference in cone angle. This allows the clamping force of the expansion sleeve on the planetary shaft to be transmitted evenly along the axial direction, reducing local stress concentration and further suppressing the micro-displacement of the planetary shaft.

[0013] In one optional embodiment, the inner wall surface of the locking hole is further provided with a first stepped surface, which is located between the first conical surface and the third conical surface; The outer wall surface of the expansion sleeve is provided with a second step surface that is adapted to the first step surface.

[0014] Beneficial effects: When the second step surface abuts against the first step surface, the maximum embedding depth of the expansion sleeve can be directly determined. This avoids the problem of excessive embedding leading to overload of the conical surface stress that may occur when relying solely on the conical surface fit, ensuring consistency in each assembly and improving structural stability during mass production.

[0015] In one optional embodiment, a plurality of first connecting holes are provided on the first stepped surface of the locking hole, and a plurality of second connecting holes are provided on the second stepped surface of the expansion sleeve, wherein the second connecting holes are provided corresponding to the first connecting holes; The expansion sleeve passes through the second connecting hole and the corresponding first connecting hole via a connector and is connected to the planetary carrier.

[0016] Beneficial effects: The double-conical surface fit primarily provides radial clamping force, while the connecting parts, after passing through the corresponding connecting holes, form a stable axial constraint force, directly limiting the displacement of the expansion sleeve along the axis of the locking hole. This avoids the problem of axial loosening of the conical surface fit due to alternating load impact during long-term operation of the gearbox, forming a dual constraint of radial clamping and axial fixation, thus improving the overall connection stability.

[0017] In one alternative embodiment, a plurality of the first connecting holes are arranged at circumferential intervals along the first stepped surface.

[0018] Beneficial effects: The annular spacing allows the connectors to be evenly distributed along the axis of the locking holes. When transmitting axial constraint force, the load can be evenly distributed circumferentially to the expansion sleeve and planetary carrier, avoiding the problem of excessive local stress caused by the connection holes being concentrated in a certain area. This reduces the risk of deformation of the expansion sleeve and planetary carrier, while ensuring that the double conical mating surface is more evenly stressed, thus improving the overall load-bearing stability of the structure.

[0019] In one alternative embodiment, the connector is configured as a bolt that passes through the second connection hole and is threaded into the first connection hole.

[0020] Beneficial effects: The fit between the bolt and the threaded hole has high-strength rigidity connection characteristics, which can provide stable axial preload and ensure that the expansion sleeve and planetary carrier do not loosen during long-term operation; at the same time, the detachability of the threaded connection allows the disassembly and assembly process to be completed simply by tightening or loosening the bolt with a tool, without damaging the component structure, which is suitable for the needs of regular maintenance of wind turbine gearboxes.

[0021] In one optional embodiment, the gearbox connection structure further includes an anti-loosening washer, which is sleeved on the bolt and sandwiched between the head of the bolt and the tightening sleeve.

[0022] Beneficial effects: Wind turbine gearboxes generate continuous vibration and alternating loads during operation, which can easily cause bolts to loosen due to vibration. Anti-loosening washers can offset the effects of vibration through their own structure, prevent relative rotation between the bolt and the threaded hole, ensure that the bolt always maintains sufficient preload, and prevent the connection between the expansion sleeve and the planetary carrier from loosening.

[0023] In one alternative embodiment, the locking hole is located at the downwind end of the planetary carrier.

[0024] Beneficial effects: When the wind turbine is running, the downwind end is affected by the airflow, and pollutants such as dust, sand, and rainwater are more easily carried away by the airflow and are less likely to accumulate in and around the locking hole. This can prevent pollutants from entering the mating surface of the expansion sleeve and the locking hole, as well as the bolt connection parts, reducing the decrease in fitting accuracy, component wear, or bolt corrosion caused by pollutants, and extending the maintenance cycle and service life of the connection structure.

[0025] Secondly, this utility model also provides a wind turbine generator, comprising: cabin; A gearbox connection structure is located inside the engine compartment.

[0026] Beneficial effects: This wind turbine, because it includes a gearbox connection structure, has the same effects as a gearbox connection structure, which will not be elaborated here. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional view of a gearbox connection structure according to one embodiment provided in this application; Figure 2 yes Figure 1 A partially enlarged schematic diagram of the mating point between the planetary carrier and the expansion sleeve; Figure 3 This is a partially enlarged schematic diagram of the downwind end of the gearbox connection structure in one embodiment provided in this application.

[0029] Explanation of reference numerals in the attached figures: 100. Planetary axis; 200, Planetary carrier; 210, Assembly hole; 220, Locking hole; 221, First conical surface; 222, Third conical surface; 223, First stepped surface; 2231, First connecting hole; 230, Downwind end; 300, Expansion sleeve; 310, Second conical surface; 320, Fourth conical surface; 330, Second stepped surface; 331, Second connecting hole; 400. Connectors; 500. Anti-loosening gaskets; 600. Planetary Gear; 700. Bearings; 800, alternate rings. Detailed Implementation

[0030] In related technologies, the traditional connection between the planetary carrier and the planetary shaft mainly uses an interference fit. During gearbox operation, the planetary bearings are subjected to alternating loads and complex torques, which can easily cause axial movement and circumferential micro-rotation, leading to decreased transmission accuracy, increased wear on the contact surfaces, and even gear meshing failure, seriously affecting the reliability and service life of the gearbox.

[0031] In the early stages of the research and development of this application, in order to solve the problems of axial movement and circumferential micro-rotation of the planetary shaft, a traditional key connection scheme was first attempted. Specifically, keyways were machined into the mounting holes of the planetary carrier and the surface of the planetary shaft, and keys were embedded to restrict the relative sliding between the two. Relying on the advantages of mature technology and low cost, the constraint effect was quickly verified, while minimizing modifications to the original structure.

[0032] However, after testing under operating conditions and running on prototypes, the reliability of the keyed connection solution became apparent. On the one hand, alternating loads and complex torques can cause localized stress concentration and severe wear on the mating surfaces of the key and keyway, and may even lead to fatigue cracks in the keyway. On the other hand, the clearance cannot be eliminated, and there is still slight axial movement. Furthermore, the machining of the keyway weakens the structural strength of the component.

[0033] Based on this, the inventors of this application redesigned the gearbox connection structure. When installing the planetary carrier and planetary shaft, the expansion sleeve is first fitted onto the outer surface of the planetary shaft, and then the planetary shaft is installed into the mounting hole of the planetary carrier, ensuring that the expansion sleeve simultaneously enters the locking hole of the planetary carrier. When the expansion sleeve is inserted into the locking hole, because the inner wall of the locking hole has a first conical surface, and the expansion sleeve has a second conical surface that matches the first conical surface, during the insertion process, the expansion sleeve moves axially towards the interior of the planetary carrier. At this time, the second conical surface abuts against the first conical surface, causing the expansion sleeve to press against the outer wall of the planetary shaft and the inner wall of the locking hole, creating a certain interference fit to ensure that the planetary shaft is firmly fixed within the mounting hole of the planetary carrier.

[0034] By adapting and abutting the second conical surface of the expansion sleeve with the first conical surface of the locking hole, the expansion sleeve can simultaneously press the outer wall surface of the planetary shaft and the inner wall surface of the locking hole during embedded assembly. The radial clamping force generated by the conical surface cooperation forms a stable constraint, increases the friction between the planetary shaft, the expansion sleeve and the planet carrier, effectively suppresses the axial movement and circumferential rotation of the planetary shaft, reduces the risk of planetary shaft displacement, avoids the decrease in transmission accuracy, the aggravation of contact surface wear and gear meshing failure, and significantly improves the operational reliability and service life of the gearbox.

[0035] In addition, compared to the shortcomings of traditional interference fits that rely on cold or hot fitting and require special equipment for disassembly, the expansion sleeve in this connection structure can be detached and installed in the locking hole. It does not require complex temperature control or destructive operations. The connection and separation of the planetary shaft and planetary carrier can be achieved by installing and removing the expansion sleeve, which simplifies the assembly process, reduces damage to the structure, and lowers the cost and difficulty of subsequent maintenance.

[0036] 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 some embodiments of this application, but not all embodiments.

[0037] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0038] According to embodiments of the present invention, on the one hand, such as Figures 1 to 3 As shown, a gearbox connection structure is provided, including a planetary shaft 100, a planetary carrier 200, and a shrink sleeve 300.

[0039] Specifically, such as Figure 1 and Figure 2As shown, the planetary carrier 200 has an assembly hole 210, and the planetary shaft 100 is installed in the assembly hole 210 of the planetary carrier 200. A locking hole 220 is also provided at one end of the planetary carrier 200. The locking hole 220 is coaxially arranged with the assembly hole 210 and communicates with the assembly hole 210. The inner wall surface of the locking hole 220 is provided with a first conical surface 221.

[0040] Specifically, such as Figure 1 and Figure 2 As shown, the expansion sleeve 300 is fitted onto the outer wall of the planetary shaft 100, and the expansion sleeve 300 is detachably installed in the locking hole 220. The outer wall of the expansion sleeve 300 is provided with a second conical surface 310, which is adapted to the first conical surface 221.

[0041] Specifically, such as Figure 1 and Figure 2 As shown, when the expansion sleeve 300 is embedded in the locking hole 220, the second conical surface 310 and the first conical surface 221 abut against each other, so that the expansion sleeve 300 presses against the outer wall surface of the planetary shaft 100 and the inner wall surface of the locking hole 220.

[0042] In this gearbox connection structure, when installing the planet carrier 200 and the planet shaft 100, the expansion sleeve 300 is first fitted onto the outer surface of the planet shaft 100, and then the planet shaft 100 is installed into the mounting hole 210 of the planet carrier 200, ensuring that the expansion sleeve 300 enters the locking hole 220 of the planet carrier 200 simultaneously. When the expansion sleeve 300 is inserted into the locking hole 220, since the inner wall of the locking hole 220 is provided with a first conical surface 221 and the expansion sleeve 300 is provided with a second conical surface 310 that matches the first conical surface 221, during the process of the expansion sleeve 300 being inserted into the locking hole 220, the expansion sleeve 300 will move towards the interior of the planetary carrier 200 along the axial direction of the locking hole 220. At this time, the second conical surface 310 abuts against the first conical surface 221, so that the expansion sleeve 300 presses the outer wall of the planetary shaft 100 and the inner wall of the locking hole 220, generating a certain interference, ensuring that the planetary shaft 100 is firmly fixed in the assembly hole 210 of the planetary carrier 200.

[0043] By adapting and abutting the second conical surface 310 of the expansion sleeve 300 with the first conical surface 221 of the locking hole 220, the expansion sleeve 300 can simultaneously press the outer wall surface of the planetary shaft 100 and the inner wall surface of the locking hole 220 during embedded assembly. The radial pressing force generated by the conical surface cooperation forms a stable constraint, increases the friction between the planetary shaft 100, the expansion sleeve 300 and the planet carrier 200, effectively suppresses the axial movement and circumferential rotation of the planetary shaft 100, reduces the risk of planetary shaft 100 displacement, avoids the decrease in transmission accuracy, the aggravation of contact surface wear and gear meshing failure, and significantly improves the operational reliability and service life of the gearbox.

[0044] In addition, compared with the shortcomings of traditional interference fits that rely on cold or hot fitting and require special equipment for disassembly, the expansion sleeve 300 in this connection structure is detachably installed in the locking hole 220. It does not require complex temperature control or destructive operation. The connection and separation of the planetary shaft 100 and the planetary carrier 200 can be achieved by installing and removing the expansion sleeve 300, which simplifies the assembly process, reduces damage to the structure, and reduces subsequent maintenance costs and difficulties.

[0045] Specifically, the first conical surface 221 can be a continuous conical surface, and the generatrix of the first conical surface 221 is a straight line, forming a fixed cone angle around the axis of the locking hole 220.

[0046] Specifically, the diameter of the first conical surface 221 gradually decreases along the assembly direction of the expansion sleeve 300 (from the outside of the planetary carrier 200 toward the assembly hole 210).

[0047] Specifically, the expansion sleeve 300 can be detachably installed in the locking hole 220 by means of bolt connection or by means of threaded connection. In this embodiment, no specific restrictions are placed on the connection method between the expansion sleeve 300 and the locking hole 220.

[0048] For example, taking the expansion sleeve 300 and the locking hole 220 as a threaded connection, the outer surface of the expansion sleeve 300 is provided with external threads, and the inner wall of the locking hole 220 is correspondingly provided with internal threads. When installing the expansion sleeve 300, simply place the expansion sleeve 300 into the locking hole 220 and tighten the expansion sleeve 300 so that the external thread of the expansion sleeve 300 engages with the internal thread of the locking hole 220, ensuring that the expansion sleeve 300 is firmly installed in the locking hole 220. Furthermore, during the rotation of the expansion sleeve 300, under the action of the engagement of the internal and external threads, the expansion sleeve 300 will move along the axial direction of the locking hole 220 toward the interior of the planetary carrier 200.

[0049] In one embodiment, such as Figure 1 and Figure 2 As shown, the inner wall surface of the locking hole 220 is also provided with a third conical surface 222, wherein the third conical surface 222 is spaced apart from the first conical surface 221 along the axial direction of the locking hole 220. Additionally, the outer wall surface of the expansion sleeve 300 is provided with a fourth conical surface 320, which is adapted to the third conical surface 222. When the expansion sleeve 300 is inserted into the locking hole 220, the second conical surface 310 abuts against the first conical surface 221, and the third conical surface 222 abuts against the fourth conical surface 320.

[0050] By providing a first conical surface 221 and a third conical surface 222 on the inner wall of the locking hole 220, compared to a single set of conical surfaces, the two sets of conical surfaces are distributed axially at intervals, which can significantly increase the total contact area between the locking hole 220 and the expansion sleeve 300. Based on the radial positive pressure generated by the conical surface fit, the larger contact area can further enhance the friction between the two, effectively suppressing the axial movement and circumferential rotation of the planetary shaft 100, and avoiding a decrease in transmission accuracy due to displacement.

[0051] The double conical surfaces form two independent radial clamping areas between the expansion sleeve 300 and the locking hole 220. When the expansion sleeve 300 is inserted, the two sets of conical surfaces abut synchronously and generate extrusion force, making the clamping force of the expansion sleeve 300 on the planetary shaft 100 more evenly distributed along the axial direction, avoiding the local stress concentration problem that may occur with a single set of conical surfaces, further improving the overall connection rigidity, and ensuring smoother load transmission.

[0052] In addition, the two sets of conical surfaces can share the load and reduce the stress intensity of a single set of conical surfaces. Especially when subjected to alternating loads and complex torques, the stress can be dispersed through multi-area stress distribution, reducing the wear and fatigue risk of the conical surface contact surface, extending the service life of the expansion sleeve 300 and planetary carrier 200, and adapting to the heavy load requirements of high-power wind turbine gearboxes.

[0053] In one embodiment, such as Figure 2 As shown, the first conical surface 221 and the third conical surface 222 are arranged in parallel.

[0054] The parallel arrangement of the first conical surface 221 and the third conical surface 222 means that the cone angles of the two sets of conical surfaces are completely consistent. When the expansion sleeve 300 is inserted into the locking hole 220, the two sets of conical surfaces will contact each other synchronously and generate radial force of the same magnitude. This can avoid the problem of one set of conical surfaces being subjected to excessive force and the other set being subjected to insufficient force due to the difference in cone angle. This allows the clamping force of the expansion sleeve 300 on the planetary shaft 100 to be uniformly transmitted along the axial direction, reducing local stress concentration and further suppressing the micro-displacement of the planetary shaft 100.

[0055] The first conical surface 221 and the third conical surface 222 have the same cone angle, and the inner wall of the locking hole 220 can be machined using the same set of machining tools or processes. There is no need to adjust the equipment parameters separately for different cone angles, which greatly reduces the machining difficulty and cost. At the same time, there is no need to calibrate the angle compatibility of the two sets of conical surfaces during assembly. It is only necessary to ensure that the expansion sleeve 300 is embedded axially to achieve a precise fit between the two conical surfaces, thereby improving assembly efficiency.

[0056] In addition, when subjected to alternating loads or complex torques, the two sets of conical surfaces can evenly distribute the load, avoiding load concentration in a certain area due to angle differences, reducing wear and fatigue damage on the conical surface contact surface, extending the service life of the expansion sleeve 300 and planetary carrier 200, and adapting to the long-term heavy load requirements of high-power wind turbine gearboxes.

[0057] In one embodiment, such as Figure 2 As shown, the inner wall surface of the locking hole 220 is also provided with a first stepped surface 223, wherein the first stepped surface 223 is located between the first conical surface 221 and the third conical surface 222. Correspondingly, the outer wall surface of the expansion sleeve 300 is provided with a second stepped surface 330, which is adapted to the first stepped surface 223.

[0058] When the second step surface 330 abuts against the first step surface 223, the maximum embedding depth of the expansion sleeve 300 can be directly determined. This avoids the problem of excessive embedding leading to overload of the conical surface stress that may occur when relying solely on the conical surface fit, ensuring consistency in each assembly and improving structural stability during mass production.

[0059] In one embodiment, such as Figure 2 As shown, a plurality of first connecting holes 2231 are formed on the inner wall surface of the locking hole 220, and the plurality of first connecting holes 2231 are located on the first stepped surface 223. A plurality of second connecting holes 331 are formed on the second stepped surface 330 of the expansion sleeve 300, wherein the second connecting holes 331 are correspondingly arranged with the first connecting holes 2231. The expansion sleeve 300 is connected to the corresponding first connecting hole 2231 through the second connecting hole 331 by the connector 400, thereby realizing the connection between the expansion sleeve 300 and the planetary carrier 200.

[0060] The double-conical surface fit primarily provides radial clamping force, while the connector 400, after passing through the corresponding connecting hole, forms a stable axial constraint force, directly limiting the displacement of the expansion sleeve 300 along the axial direction of the locking hole 220. This avoids the problem of axial loosening of the conical surface fit due to alternating load impact during long-term operation of the gearbox, forming a dual constraint of radial clamping and axial fixation, thus improving the overall connection stability.

[0061] By providing a first connecting hole 2231 and a second connecting hole 331, when installing the expansion sleeve 300, the connector 400 only needs to be passed through the first connecting hole 2231 and connected to the second connecting hole 331. When disassembling the expansion sleeve 300, the connector 400 only needs to be removed from the first connecting hole 2231 and the second connecting hole 331, thus facilitating the installation and removal of the expansion sleeve 300.

[0062] In one embodiment, such as Figure 1 and Figure 3 As shown, a plurality of first connecting holes 2231 are arranged in a ring at intervals along the circumference of the first step surface 223.

[0063] The annular spacing allows the connector 400 to be evenly distributed along the axis of the locking hole 220. When transmitting axial constraint force, the load can be evenly distributed circumferentially to the expansion sleeve 300 and the planetary carrier 200, avoiding the problem of excessive local stress caused by the connection hole being concentrated in a certain area, reducing the risk of deformation of the expansion sleeve 300 and the planetary carrier 200, and ensuring that the double conical mating surface is more evenly stressed, thus improving the overall structural load-bearing stability.

[0064] In one embodiment, such as Figure 2 As shown, the connector 400 is configured as a bolt, which passes through the second connecting hole 331 and is threadedly connected to the first connecting hole 2231.

[0065] The fit between the bolt and the threaded hole has high-strength rigidity connection characteristics, which can provide stable axial preload and ensure that the expansion sleeve 300 and the planetary carrier 200 do not loosen during long-term operation; at the same time, the detachability of the threaded connection allows the disassembly and assembly process to be completed simply by tightening or loosening the bolt with a tool, without damaging the component structure, which is suitable for the needs of regular maintenance of wind turbine gearboxes.

[0066] The preload generated when the bolts are tightened can further enhance the fit between the expansion sleeve 300 and the locking hole 220, making the double-cone surface fit tighter and the radial clamping force more stable. At the same time, the preload can offset some of the impact from the alternating load, reduce the risk of clearance between the conical mating surfaces, and improve the constraint rigidity of the planetary shaft 100.

[0067] In one embodiment, such as Figure 2 As shown, the gearbox connection structure also includes an anti-loosening washer 500, which is sleeved on the bolt and clamped between the bolt head and the tightening sleeve 300.

[0068] Wind turbine gearboxes generate continuous vibration and alternating loads during operation, which can easily cause bolts to loosen due to vibration. The anti-loosening washer 500 can offset the effects of vibration through its own structure (such as elastic deformation and increased friction), prevent relative rotation between the bolt and the threaded hole, ensure that the bolt always maintains sufficient preload, and avoid loosening of the connection between the expansion sleeve 300 and the planetary carrier 200.

[0069] When the bolt head directly contacts the expansion sleeve 300, the surface of the expansion sleeve 300 is easily scratched due to concentrated pressure during tightening, affecting the subsequent disassembly or fitting accuracy. The anti-loosening washer 500 can act as a buffer medium to disperse the pressure of the bolt head on the expansion sleeve 300, avoid indentations or scratches on the contact surface, and protect the structural integrity of the expansion sleeve 300.

[0070] In one embodiment, such as Figure 1 As shown, the locking hole 220 is located at the downwind end 230 of the planetary carrier 200.

[0071] When the wind turbine is running, the downwind end 230 is affected by the airflow, and pollutants such as dust, sand, and rainwater are more easily carried away by the airflow and are less likely to accumulate in and around the locking hole 220. This can prevent pollutants from entering the mating surface of the expansion sleeve 300 and the locking hole 220, as well as the bolt connection parts, reducing the decrease in fitting accuracy, component wear, or bolt corrosion caused by pollutants, and extending the maintenance cycle and service life of the connection structure.

[0072] Compared to the upwind end, the leeward end 230 is less directly impacted by wind, and personnel operating in this area during equipment maintenance face lower risks and interference from airflow. When the expansion sleeve 300 needs to be disassembled for maintenance, operation is more convenient at the relatively stable leeward end 230, reducing the risk of tools falling or operational errors caused by strong winds, thus improving maintenance efficiency and safety.

[0073] According to an embodiment of the present invention, on the other hand, as... Figures 1 to 3 As shown, a wind turbine generator is also provided, including a nacelle and a gearbox connection structure.

[0074] Specifically, the gearbox connection structure is installed inside the engine compartment.

[0075] Specifically, such as Figure 1 As shown, planetary gears 600 may be provided on the planetary shaft 100, and multiple bearings 700 may be provided between the planetary shaft 100 and the planetary gears 600. Spacers 800 may be provided between two adjacent bearings 700.

[0076] This wind turbine, since it includes a gearbox connection structure, has the same effect as a gearbox connection structure, and will not be described in detail here.

[0077] The terms "upper" and "lower" are used to describe the relative positions of the various structures in the accompanying drawings. They are only for clarity of description and are not intended to limit the scope of implementation of this application. Any changes or adjustments to the relative positions without substantially altering the technical content shall also be considered within the scope of implementation of this application.

[0078] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0079] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0081] 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 gearbox connection structure, characterized in that, include: Planetary axis (100); The planetary carrier (200) has an assembly hole (210) in which the planetary shaft (100) is installed; one end of the planetary carrier (200) also has a locking hole (220), which is coaxially arranged with the assembly hole (210) and communicates with the assembly hole (210); the inner wall surface of the locking hole (220) is provided with a first conical surface (221). An expansion sleeve (300) is fitted onto the outer wall of the planetary shaft (100), and the expansion sleeve (300) is detachably disposed in the locking hole (220). The outer wall of the expansion sleeve (300) is provided with a second conical surface (310) that is adapted to the first conical surface (221). When the expansion sleeve (300) is inserted into the locking hole (220), the second conical surface (310) abuts against the first conical surface (221), so that the expansion sleeve (300) presses against the outer wall surface of the planetary shaft (100) and the inner wall surface of the locking hole (220).

2. The gearbox connection structure according to claim 1, characterized in that, The inner wall surface of the locking hole (220) is also provided with a third conical surface (222), the third conical surface (222) and the first conical surface (221) are spaced apart along the axial direction of the locking hole (220), and the outer wall surface of the expansion sleeve (300) is provided with a fourth conical surface (320) that is adapted to the third conical surface (222). When the expansion sleeve (300) is inserted into the locking hole (220), the second conical surface (310) abuts against the first conical surface (221), and the third conical surface (222) abuts against the fourth conical surface (320).

3. The gearbox connection structure according to claim 2, characterized in that, The first conical surface (221) is arranged parallel to the third conical surface (222).

4. The gearbox connection structure according to claim 2, characterized in that, The inner wall surface of the locking hole (220) is also provided with a first stepped surface (223), which is located between the first conical surface (221) and the third conical surface (222); The outer wall of the expansion sleeve (300) is provided with a second step surface (330) that is adapted to the first step surface (223).

5. The gearbox connection structure according to claim 4, characterized in that, The locking hole (220) has a plurality of first connecting holes (2231) on the first stepped surface (223), and the expansion sleeve (300) has a plurality of second connecting holes (331) on the second stepped surface (330), with the second connecting holes (331) corresponding to the first connecting holes (2231); The expansion sleeve (300) is connected to the planetary carrier (200) by passing through the second connection hole (331) and the corresponding first connection hole (2231) via a connector (400).

6. The gearbox connection structure according to claim 5, characterized in that, Multiple first connecting holes (2231) are arranged circumferentially at intervals along the first step surface (223).

7. The gearbox connection structure according to claim 5, characterized in that, The connector (400) is configured as a bolt that passes through the second connecting hole (331) and is threaded into the first connecting hole (2231).

8. The gearbox connection structure according to claim 7, characterized in that, The gearbox connection structure also includes an anti-loosening washer (500), which is sleeved on the bolt and sandwiched between the head of the bolt and the tightening sleeve (300).

9. The gearbox connection structure according to any one of claims 1 to 8, characterized in that, The locking hole (220) is located at the downwind end (230) of the planetary carrier (200).

10. A wind turbine generator, characterized in that, include: cabin; The gearbox connection structure according to any one of claims 1 to 9, wherein the gearbox connection structure is disposed within the engine compartment.

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