Wind power gear box and wind generating set
By using a press fit between the pin and the torque arm in the wind turbine gearbox and securing it with a locating pin, the problem of axial displacement of the pin is solved, thus improving the stability and connection stability of the wind turbine gearbox and wind turbine generator set.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-06
- Publication Date
- 2026-04-03
AI Technical Summary
In wind turbine gearboxes, the pins are prone to axial displacement, which affects the stability of the gearbox.
The pin and the torque arm are press-fitted in the shaft hole and fastened by a locating pin. The locating pin is axially centered in the area of minimum bending stress of the pin. The press-fitting between the pin and the torque arm, along with the fastening of the locating pin, prevents axial displacement of the pin.
It effectively suppresses the axial displacement of the pin shaft, improves the stability of the wind turbine gearbox, ensures the stable connection between the wind turbine gearbox and the nacelle structure of the wind turbine generator set, and ensures the stable operation of the wind turbine gearbox and the wind turbine generator set.
Smart Images
Figure CN224079556U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wind power technology, specifically to wind turbine gearboxes and wind turbine generator sets. Background Technology
[0002] In wind turbine generator sets, the gearbox enables speed-increasing and torque-reducing transmission between the wind turbine and the generator. The gearbox housing is equipped with a torque arm, and a pin passes through the shaft hole of the torque arm. The gearbox is connected to the nacelle structure of the wind turbine generator set through the pin.
[0003] During the operation of a wind turbine generator set, the pin shaft needs to withstand the reaction torque, which poses a risk of axial displacement and affects the stability of the gearbox.
[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content
[0005] In view of this, the present invention provides a wind turbine gearbox and a wind turbine generator set to solve the problem that the pin of the torque arm is prone to axial displacement, which in turn affects the stability of the wind turbine gearbox.
[0006] According to one aspect of the present invention, a wind turbine gearbox is provided, wherein the gearbox housing is provided with a torque arm, a pin is inserted through the shaft hole of the torque arm, the pin is press-fitted in the shaft hole, and the torque arm and the pin are also fastened together by a locating pin that passes through the torque arm and extends into the pin; wherein, in the axial direction, the locating pin is centrally located on the pin, and / or, in the circumferential direction, the locating pin is located in the region of minimum bending stress of the pin.
[0007] In some embodiments, the region of minimum bending stress is located in the area of the pin away from the housing.
[0008] In some embodiments, the end edge of the opening into which the locating pin extends of the pin is provided with a rounded corner.
[0009] In some embodiments, an elastic sealing ring is provided in the rounded corner.
[0010] In some embodiments, the length L1 of the locating pin extending into the pin shaft and the total length L2 of the locating pin satisfy: L1 / L2≥1 / 3; the length L1 and the radial length L3 of the pin shaft satisfy: 20%≤L1 / L3≤30%.
[0011] In some embodiments, the interference fit between the locating pin and the pin shaft is greater than the interference fit between the locating pin and the torque arm.
[0012] In some embodiments, the locating pin extends radially along the pin shaft.
[0013] In some embodiments, the locating pin is provided with a threaded channel, the pin shaft is provided with a threaded groove communicating with the threaded channel, and the torque arm and the pin shaft are also fastened together by a bolt passing through the threaded channel and screwed into the threaded groove.
[0014] In some embodiments, the pin comprises three axially distributed segments, wherein the middle segment has the largest diameter and is press-fitted into the torque arm.
[0015] According to another aspect of the present invention, a wind turbine generator set is provided, the wind turbine generator set being configured with a wind turbine gearbox as described in any of the above embodiments.
[0016] The beneficial effects of this utility model compared with the prior art include at least the following:
[0017] In this wind turbine gearbox, the pin and torque arm are press-fitted together to achieve a stable connection. Furthermore, a locating pin is introduced to securely connect the torque arm and the pin, effectively preventing potential axial displacement of the pin. The locating pin can be axially centered on the pin to minimize the negative impact of the opening on the pin using the press-fit between the pin and the torque arm. The circumferential position of the locating pin can be located in the area of minimum bending stress on the pin to avoid high stress accumulation due to the opening. Thus, this invention utilizes the press-fit between the pin and the torque arm, and the locating pin extending through the torque arm and into the pin for secure connection, effectively suppressing axial displacement of the pin, improving the stability of the wind turbine gearbox, and ensuring a stable connection between the wind turbine gearbox and the nacelle structure of the wind turbine generator, thereby further ensuring the stable operation of both the wind turbine gearbox and the wind turbine generator.
[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description
[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.
[0020] Figure 1 A partial three-dimensional structural schematic diagram of the wind turbine gearbox in an embodiment of this utility model is shown;
[0021] Figure 2 This diagram shows the fit structure between the torque arm and the pin shaft of the wind turbine gearbox in an embodiment of the present invention.
[0022] Figure 3 A three-dimensional structural schematic diagram of the pin shaft in an embodiment of this utility model is shown;
[0023] Figure 4 This diagram shows a partial cross-sectional view of the pin shaft in an embodiment of the present invention.
[0024] Figure 5 This diagram illustrates another possible fit between the torque arm and the pin in an embodiment of the present invention. Detailed Implementation
[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.
[0026] The accompanying drawings are merely illustrative of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar structures, and therefore, repeated descriptions of them will be omitted.
[0027] The use of terms such as "first," "second," and similar words in the specific description does not indicate any order, quantity, or importance, but is merely used to distinguish different components. Terms such as "axial," "radial," and "circumferential," indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, in the description of the present invention, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components.
[0028] It should be noted that, unless otherwise specified, the embodiments of this utility model and the features in different embodiments can be combined with each other.
[0029] Figure 1 The schematic diagram illustrates a partial three-dimensional structure of the wind turbine gearbox in an embodiment of this utility model. Figure 2 This illustration shows the mating structure between the torque arm and the pin shaft of the wind turbine gearbox in an embodiment of this utility model. Figure 1 and Figure 2 As shown: The wind turbine gearbox provided by this utility model has a torque arm 110 on its housing 100. A pin 200 passes through the shaft hole 111 of the torque arm 110 and is press-fitted in the shaft hole 111. The torque arm 110 and the pin 200 are also fastened together by a positioning pin 300 that passes through the torque arm 110 and extends into the pin 200. In the axial direction Z, the positioning pin 300 is centrally located on the pin 200, and / or, in the circumferential direction C, the positioning pin 300 is located in the region of minimum bending stress of the pin 200.
[0030] The press-fit between the pin 200 and the shaft hole 111 of the torque arm 110 means that the pin 200 is press-fitted into the shaft hole 111 to achieve a stable connection with the torque arm 110. Furthermore, this utility model also introduces a locating pin 300 to fasten the torque arm 110 and the pin 200, effectively avoiding the potential displacement risk of the pin 200 in the axial Z direction.
[0031] The locating pin 300 can be axially centered on the pin 200 to minimize the negative impact of the opening on the pin 200 by utilizing the press fit between the pin 200 and the torque arm 110. Specifically, the locating pin 300 is located at the axial center of the pin 200, and the press fit lengths on both sides are equal, forming a symmetrical arrangement. This achieves the following: Firstly, it ensures that the axial load is symmetrically distributed along the Z-axis of the pin 200, avoiding local stress peaks caused by asymmetrical arrangement, and offsetting the tensile stress at the edge of the opening of the locating pin 300 through the symmetrical press fit on both sides; secondly, when the pin 200 is subjected to radial load and generates bending moment, the locating pin 300 located at the axial center can decompose the bending moment, reduce the peak stress in the center, and prevent the pin 200 from bending and deforming.
[0032] The circumferential position of the locating pin 300 can be located in the region of minimum bending stress of the pin 200 to avoid high stress accumulation caused by the opening in the pin 200. Specifically, when the pin 200 is subjected to torque, the bending stress on its cross-section is non-uniformly distributed. Setting the opening of the locating pin 300 in the circumferential position of minimum bending stress can avoid high stress accumulation caused by the opening, thereby minimizing problems such as cracking, deformation, and strength reduction in the locating pin 300 caused by the opening. The region of minimum bending stress in the circumferential direction C of the pin 200 can be determined by software simulation before assembly. Typically, according to actual working conditions, the region of minimum bending stress is located in the area of the pin 200 away from the housing 100, that is, in the outermost region of the pin 200 relative to the housing 100.
[0033] This utility model utilizes the press fit between the pin 200 and the torque arm 110, and simultaneously uses the positioning pin 300 that passes through the torque arm 110 and extends into the pin 200 for fastening connection, effectively suppressing the axial displacement of the pin 200, improving the stability of the wind turbine gearbox, and ensuring the stable connection between the wind turbine gearbox and the nacelle structure of the wind turbine generator set, thereby further ensuring the stable operation of the wind turbine gearbox and the wind turbine generator set.
[0034] Figure 3 This illustration shows the three-dimensional structure of the pin in an embodiment of the present invention. Figure 4 The diagram illustrates a partial cross-sectional view of the pin in an embodiment of this utility model, in conjunction with... Figures 1 to 4 As shown, in some embodiments, the end edge of the opening 220 into which the locating pin 300 extends of the pin 200 is provided with a fillet 222. The fillet 222 can be a rounded corner or an arc transition, which can optimize the end edge structure of the opening 220, avoid direct contact between the locating pin 300 and the end edge of the opening 220 to generate pressure, thereby minimizing the equivalent stress around the opening 220.
[0035] Specifically, abrupt changes in geometric shapes such as right angles and sharp corners can cause stress concentration, leading to a sharp increase in local stress. Using fillet 222 for a smooth transition disperses the single-point stress peak at the right angle into a continuous stress distributed along the arc, effectively reducing the peak stress. Furthermore, right-angled edges are prone to fatigue cracks; the continuous smooth transition of fillet 222 reduces shear stress components, delays crack initiation, and improves the fatigue limit. Moreover, fillet 222 also serves as assembly protection, preventing scratches on the locating pin 300 during assembly and ensuring the locating pin 300 securely connects the torque arm 110 and the pin shaft 200.
[0036] In some embodiments, an elastic sealing ring may be provided in the fillet 222 to enhance the fit with the locating pin 300 and further provide a buffering effect, thereby improving the reliability of the fit between the pin 200, the torque arm 110 and the locating pin 300.
[0037] In some embodiments, the length L1 of the locating pin 300 extending into the pin 200 and the total length L2 of the locating pin 300 satisfy: L1 / L2≥1 / 3. This ensures that the locating pin 300 has sufficient length to extend into the pin 200, thereby achieving a secure connection between the pin 200 and the torque arm 110. Furthermore, the length L1 of the locating pin 300 extending into the pin 200 and the radial length L3 of the pin 200 satisfy: 20%≤L1 / L3≤30%. This ensures a stable connection between the locating pin 300 and the pin 200 while preventing the structural strength of the pin 200 from being affected by excessively deep openings.
[0038] In some embodiments, the interference fit between the locating pin 300 and the pin 200 is greater than the interference fit between the locating pin 300 and the torque arm 110. This difference in interference fit optimizes the load path. The larger interference fit between the locating pin 300 and the pin 200 provides torque transmission and axial constraint, while the smaller interference fit between the locating pin 300 and the torque arm 110 provides auxiliary constraint, preventing excessive stress concentration. Furthermore, this facilitates the assembly of the locating pin 300 and reduces the risk of deformation during press-fitting.
[0039] In some embodiments, the locating pin 300 extends radially X along the pin shaft 200, which facilitates the drilling of the pin shaft 200 and the torque arm 110, improves the fitting accuracy between the locating pin 300 and the torque arm 110 and the pin shaft 200, and makes the axis of the locating pin 300 perpendicular to the axis of the pin shaft 200, forming an orthogonal fit, thereby improving the shear resistance of the locating pin 300.
[0040] In some embodiments, the locating pin 300 may also be tilted towards the low-load end of the pin 200, for example, tilted at 5° to 15°. Specifically, the two ends of the pin 200 are used to connect the nacelle structural components at the wind turbine end and the generator end, respectively. The wind turbine end has a lower rotational speed and higher torque, and the end of the pin 200 connected to the nacelle structural component at the wind turbine end bears higher contact stress and bending stress, thus being a high-load end. The generator end has a higher rotational speed and lower torque, and the end of the pin 200 connected to the nacelle structural component at the generator end bears lower torque, thus being a low-load end. The tilting of the locating pin 300 towards the low-load end of the pin 200 can create appropriate asymmetric stress compensation, balancing the unbalanced forces at both ends of the pin 200.
[0041] Figure 5 This illustration shows another type of mating structure between the torque arm and the pin in an embodiment of the present invention, combined with... Figure 2 and Figure 5As shown, in some embodiments, the locating pin 300 has a threaded channel, and the pin 200 has a threaded groove communicating with the threaded channel. The torque arm 110 and the pin 200 are also fastened together by a bolt 400 that passes through the threaded channel and is screwed into the threaded groove. By tightening the bolt 400, the locating pin 300 can expand radially, thereby forming an actively adjustable interference fit with the torque arm 110 and the pin 200. Compared with static press-fit, this can improve the fitting accuracy between the locating pin 300 and the torque arm 110 and the pin 200. In addition, the expansion of the locating pin 300 can compensate for the fitting clearance caused by vibration, further improving the tightness of the fit between the locating pin 300 and the torque arm 110 and the pin 200. Furthermore, through the basic interference fit between the locating pin 300 and the torque arm 110 and the pin 200, the radial expansion of the locating pin 300 during the assembly of the bolt 400 to enhance the contact pressure between it and the torque arm 110 and the pin 200, and the threaded locking fit between the bolt 400 and the threaded groove of the locating pin 300 and the pin 200, a three-stage locking fit is achieved, significantly improving the axial anti-migration capability of the pin 200. In the highly corrosive environment of offshore wind power, the bolt 400 can also be periodically retightened to compensate for the preload loss caused by corrosion, improving the reliability of the wind turbine gearbox under extreme operating conditions.
[0042] Combination Figure 2 , Figure 3 and Figure 5 As shown, in some embodiments, the pin 200 includes three axially distributed sections (200a, 200b, 200c), of which the middle section 200b has the largest diameter. The middle section 200b is press-fitted into the torque arm 110 and connected to the positioning pin 300, thereby achieving a stable connection between the pin 200 and the torque arm 110 and effectively avoiding the risk of axial displacement of the pin 200.
[0043] This utility model embodiment also provides a wind turbine generator set, which is equipped with a wind turbine gearbox as described in any of the above embodiments. It can be connected by press-fitting the pin shaft 200 and the torque arm 110, and by fastening the connection by the positioning pin 300 that passes through the torque arm 110 and extends into the pin shaft 200. Furthermore, the expansion locking of the bolt 400 can be used to effectively suppress the axial displacement of the pin shaft 200, improve the stability of the wind turbine gearbox, and ensure the stable connection between the wind turbine gearbox and the nacelle structure of the wind turbine generator set, thereby further ensuring the stable operation of the wind turbine gearbox and the wind turbine generator set.
[0044] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.
Claims
1. A wind power gearbox, a gearbox of the wind power gearbox is provided with a torque arm, a pin is arranged in a shaft hole of the torque arm, characterized in that: the pin is press-fitted in the shaft hole, the torque arm and the pin are further fastened by a positioning pin passing through the torque arm and extending into the pin; wherein the positioning pin is centrally arranged on the pin in the axial direction, and / or the positioning pin is located in a minimum bending stress area of the pin in the circumferential direction.
2. A wind turbine gearbox according to claim 1, characterised in that The minimum bending stress area is located in the area of the pin away from the gearbox.
3. The wind turbine gearbox of claim 1, wherein, An end of an opening of the pin for the positioning pin to extend into is provided with a round corner.
4. A wind turbine gearbox according to claim 3, wherein An elastic sealing ring is arranged in the round corner.
5. The wind turbine gearbox of claim 1, wherein, The length L1 of the positioning pin extending into the pin and the total length L2 of the positioning pin satisfy: L1 / L2≥1 / 3; The length L1 and the radial length L3 of the pin satisfy: 20%≤L1 / L3≤30%.
6. The wind turbine gearbox of claim 1, wherein, The interference between the positioning pin and the pin is greater than the interference between the positioning pin and the torque arm.
7. A wind turbine gearbox according to claim 1, wherein The positioning pin extends in the radial direction of the pin.
8. The wind turbine gearbox of claim 1, wherein, A screw channel is arranged in the positioning pin, and a threaded groove communicating with the screw channel is arranged in the pin, and the torque arm and the pin are further fastened by a bolt passing through the screw channel and screwing into the threaded groove.
9. A wind turbine gearbox according to any of claims 1-8, characterised in that The pin includes three axially distributed segments, wherein the middle segment has the largest diameter, and the middle segment is press-fitted in the torque arm.
10. A wind power unit, characterized in that The wind turbine generator is configured with the wind power gearbox according to any one of claims 1-9.