Wind power gear box and wind generating set

Abstract

The utility model relates to the technical field of wind power, and provides a wind power gear box and a wind generating set. A box body of the wind power gear box is provided with a torque arm, a pin shaft is arranged in a shaft hole of the torque arm, a blocking shoulder is arranged in the central area of the pin shaft in the axial direction, a step part is arranged in the central area of the shaft hole in the axial direction, and shaft parts, located on the two sides of the blocking shoulder, of the pin shaft are in interference press fit with hole sections, located on the two sides of the step part, of the shaft hole respectively. And the stop shoulder and the step part form an axial stop matching structure. According to the utility model, the retaining shoulder of the pin shaft is matched with the step part of the shaft hole of the torque arm to form an axial retaining matching structure, so that the axial displacement of the pin shaft in one direction is effectively inhibited; the retaining shoulder is located in the center area, the load transmission path of the pin shaft can be optimized, local stress concentration is avoided, and the structural strength and the stress bearing capacity of the pin shaft are improved. Due to the fact that the stress capable of being borne by the pin shaft is increased, the diameter of the pin shaft can be correspondingly reduced, the weight of the pin shaft is reduced, and lightweight design is achieved.

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 is a key transmission component connecting the wind turbine and the generator, used to increase the low-speed, high-torque rotation of the wind turbine to the high-speed rotation required by the generator. The gearbox housing is equipped with torque arms, which are configured to fix the wind turbine gearbox to the wind turbine generator set, for example, by connecting it to the casing of both the wind turbine and the generator.

[0003] The torque arm is connected to external components through a pin that passes through its shaft hole, and the pin is used to connect the torque arm to the wind turbine side casing and the generator side casing.

[0004] During the operation of a wind turbine generator set, due to the uneven load distribution between the rotor side and the generator side, there is a risk of axial displacement of the pin shaft, which can easily migrate from the rotor side to the generator side.

[0005] 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

[0006] In view of this, the present invention provides a wind turbine gearbox and a wind turbine generator set to solve the technical problem that the pin of the torque arm is prone to axial displacement.

[0007] According to one aspect of the present invention, a wind turbine gearbox is provided. The gearbox housing is provided with a torque arm, and a pin is provided in the shaft hole of the torque arm. The pin has a shoulder in the central region along the axial direction, and the shaft hole has a step in the central region along the axial direction. The shaft portions of the pin located on both sides of the shoulder are respectively press-fitted into the holes on both sides of the step in the shaft hole, and the shoulder and the step form an axial stop fit structure.

[0008] In some embodiments, the central region of the pin extends to both sides with the midpoint of the pin along the axial direction as the center, and the axial length of the central region of the pin is less than or equal to 20% of the axial length of the pin; the central region of the shaft hole extends to both sides with the midpoint of the shaft hole along the axial direction as the center, and the axial length of the central region of the shaft hole is less than or equal to 20% of the axial length of the shaft hole.

[0009] In some embodiments, the axial lengths of the shaft portions on both sides of the shoulder of the pin are equal, and the axial lengths of the hole portions on both sides of the step of the shaft hole are equal.

[0010] In some embodiments, the shaft portion of the pin located on both sides of the shoulder includes a thicker first shaft portion and a thinner second shaft portion, and the hole segment located on both sides of the step portion includes a larger first hole segment and a smaller second hole segment; the axial length of the first shaft portion is greater than the axial length of the second shaft portion, and the axial length of the first hole segment is greater than the axial length of the second hole segment.

[0011] In some embodiments, the shaft portion of the pin located on both sides of the shoulder includes a thicker first shaft portion and a thinner second shaft portion, and the hole segment located on both sides of the step portion includes a larger first hole segment and a smaller second hole segment; the interference fit between the first shaft portion and the first hole segment is greater than the interference fit between the second shaft portion and the second hole segment.

[0012] In some embodiments, an elastic preload is pressed between the diameter variation section of the shoulder and the diameter variation section of the step.

[0013] In some embodiments, the diameter change angle of the shoulder and the diameter change angle of the step are formed as rounded transition angles.

[0014] In some embodiments, the surface of the shoulder and / or the surface of the step portion is coated with a damping layer.

[0015] In some embodiments, the torque arm and the housing are integrated into one structure; of the two ends of the pin, the end connected to the thicker shaft portion is used to connect to the wind turbine side housing, and the end connected to the thinner shaft portion is used to connect to the generator side housing.

[0016] 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.

[0017] The beneficial effects of this utility model compared with the prior art include at least the following:

[0018] This invention utilizes the engagement of the shoulder of the pin with the stepped portion of the shaft hole of the torque arm to form an axial stop fit structure, effectively suppressing axial displacement of the pin in one direction. In practical applications, this suppresses the risk of axial migration of the pin from the wind turbine side to the generator side. Furthermore, the shaft portions on both sides of the shoulder are respectively press-fitted into the holes on both sides of the stepped portion of the shaft hole, forming a double-stage press fit. The axial stop fit structure and the double-stage press fit create a dual constraint, jointly resisting axial displacement of the pin. Thus, the wind turbine gearbox is stably connected to the wind turbine generator set using the torque arm and pin, ensuring the reliable operation of both the wind turbine gearbox and the wind turbine generator set.

[0019] In this invention, the shoulder of the pin is located in the central region along the axial direction of the pin, which achieves the following: Firstly, the shoulder being located in the central region optimizes the load transmission path of the pin, avoids local stress concentration, and is fully protected by the holes on both sides, enabling it to withstand greater torque and bending moment, thus improving the structural strength and stress resistance of the pin. Secondly, the shoulder being located in the central region balances the axial load distribution of the pin, preventing loosening caused by unilateral loading, thereby reducing the risk of axial migration. Thirdly, thanks to the increased stress that the pin can withstand, the diameter of the pin can be reduced accordingly while meeting application requirements, thereby saving materials, reducing the weight of the pin, and achieving a lightweight design.

[0020] 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

[0021] 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.

[0022] Figure 1 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.

[0023] Figure 2 This diagram illustrates the fit between the stepped portion of the shaft hole of the torque arm and the shoulder of the pin in an embodiment of the present invention. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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," etc., 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.

[0027] 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.

[0028] Figure 1 This illustration shows the mating structure between the torque arm and the pin shaft of the wind turbine gearbox in an embodiment of the present invention. (Refer to...) Figure 1 As shown, the wind turbine gearbox provided in this embodiment of the present invention has a torque arm 100 in its housing and a pin 200 in its shaft hole. The pin 200 has a shoulder 220 in the central region along the Z-axis and a step 120 in the central region along the Z-axis. The shaft portions (200a, 200b) of the pin 200 located on both sides of the shoulder 220 are press-fitted into the hole sections (100a, 100b) of the shaft hole located on both sides of the step 120. The shoulder 220 and the step 120 form an axial stop fit structure.

[0029] This invention utilizes the engagement of the shoulder 220 of the pin 200 with the stepped portion 120 of the shaft hole of the torque arm 100 to form an axial stop fit structure, effectively suppressing axial displacement of the pin 200 in one direction. In practical applications, this suppresses the risk of axial migration of the pin 200 from the wind turbine side to the generator side. Furthermore, the shaft portions (200a, 200b) of the pin 200 located on both sides of the shoulder 220 are respectively press-fitted into the hole sections (100a, 100b) on both sides of the stepped portion 120 of the shaft hole, forming a double-stage press fit. The axial stop fit structure and the double-stage press fit create a double constraint, jointly resisting the axial displacement of the pin 200. Thus, the wind turbine gearbox is stably connected to the wind turbine generator set using the torque arm 100 and the pin 200, ensuring the reliable operation of both the wind turbine gearbox and the wind turbine generator set.

[0030] In this invention, the shoulder 220 of the pin 200 is located in the central region along the Z-axis of the pin 200, which achieves the following: Firstly, the shoulder 220 being located in the central region optimizes the load transmission path of the pin 200, avoids local stress concentration, and is fully protected by the holes (100a, 100b) on both sides, enabling it to withstand greater torque and bending moment, thus improving the structural strength and stress resistance of the pin 200. Secondly, the shoulder 220 being located in the central region balances the axial load distribution of the pin 200, preventing loosening caused by unilateral loading, thereby reducing the risk of axial migration. Thirdly, thanks to the increased stress that the pin 200 can withstand, the diameter of the pin 200 can be reduced accordingly while meeting application requirements, thereby saving materials, reducing the weight of the pin 200, and achieving a lightweight design.

[0031] The torque arm 100 and the gearbox housing can be integrated into a single structure, enhancing overall structural strength. Of the two ends of the pin 200, the end connected to the thicker first shaft portion 200a connects to the rotor-side housing, while the end connected to the thinner second shaft portion 200b connects to the generator-side housing. The axial stop fit structure, double-stage press fit design, and the design of the shoulder 220 positioned in the central area of ​​the pin 200 effectively solve the problem of the pin 200 easily migrating from the rotor side to the generator side due to uneven load distribution between the rotor and generator sides. This ensures the wind turbine gearbox is stably connected to the wind turbine generator set via the torque arm 100 and the pin 200, guaranteeing reliable operation of both the gearbox and the wind turbine generator set.

[0032] In some embodiments, the central region of the pin 200 extends to both sides from the midpoint of the pin 200 along the axial direction Z, and the axial length of the central region of the pin 200 is less than or equal to 20% of the axial length of the pin 200. That is, the shoulder 220 is preferably located near the midpoint of the pin 200, and can be appropriately offset to both sides, but the error preferably does not exceed 20%. Furthermore, the central region of the shaft hole of the torque arm 100 extends to both sides from the midpoint of the shaft hole along the axial direction Z, and the axial length of the central region of the shaft hole is less than or equal to 20% of the axial length of the shaft hole. That is, the step portion 120 is preferably located near the midpoint of the shaft hole, and can be appropriately offset to both sides, but the error preferably does not exceed 20%. This avoids the shoulder 220 / step portion 120 being biased to one end, thus preventing a weakening of the stress-bearing capacity of the pin 200.

[0033] In some embodiments, the axial length L of the shaft portions (200a, 200b) of the pin 200 located on both sides of the shoulder 220 is equal, and the axial length of the hole segments (100a, 100b) of the shaft hole located on both sides of the step portion 120 is equal. Through the precisely centered design of the shoulder 220 and the step portion 120, the mating structure of the pin 200 and the torque arm 100 forms a symmetrical structure, thereby balancing the axial load distribution and maximizing the protection of the shoulder 220 by the torque arm 100, significantly reducing the risk of axial migration of the pin 200.

[0034] In some embodiments, the shaft portions (200a, 200b) of the pin 200 located on both sides of the shoulder 220 include a thicker first shaft portion 200a and a thinner second shaft portion 200b, and the hole segments (100a, 100b) of the shaft hole located on both sides of the stepped portion 120 include a larger first hole segment 100a and a smaller second hole segment 100b; the axial length of the first shaft portion 200a is greater than the axial length of the second shaft portion 200b, and the axial length of the first hole segment 100a is greater than the axial length of the second hole segment 100b. During the assembly of the wind turbine gearbox, typically, the first shaft portion 200a is used to connect to the wind turbine side housing with a heavier load, and the second shaft portion 200b is used to connect to the generator side housing with a lighter load; by designing the first shaft portion 200a to be slightly longer than the second shaft portion 200b, the load difference on both sides of the pin 200 can be balanced, improving the overall structural reliability.

[0035] In some embodiments, the interference fit between the first shaft portion 200a and the first hole section 100a is greater than the interference fit between the second shaft portion 200b and the second hole section 100b. Considering the load difference on both sides of the pin 200, the interference fit between the pin 200 near the wind turbine and the torque arm 100 can be slightly greater than the interference fit between the pin 200 near the generator and the torque arm 100. Through the two-stage differential interference fit, it is possible to: on the one hand, effectively resist high torque loads by using a larger interference fit near the wind turbine to enhance frictional locking force and ensure that the anti-slip capability of this section is maximized; on the other hand, take into account assembly processability by using a smaller interference fit near the generator to reduce the overall stress peak and avoid exceeding the assembly stress limit.

[0036] Figure 2 The diagram illustrates the fit between the stepped portion of the torque arm's shaft hole and the shoulder of the pin. Figure 1 and Figure 2 As shown, the shoulder 220 has a corresponding diameter change corner 220a and a diameter change section 220b, and the step portion 120 also has a corresponding diameter change corner 120a and a diameter change section 120b.

[0037] In some embodiments, the diameter change angle 220a of the shoulder 220 and the diameter change angle 120a of the step portion 120 are formed as arc transition angles. The arc transition angles effectively disperse the mating stress between the shoulder 220 and the step portion 120, avoid stress concentration, and thus improve the mating reliability between the pin 200 and the torque arm 100.

[0038] In some embodiments, an elastic preload (not specifically shown) is press-fitted between the diameter variation section 220b of the shoulder 220 and the diameter variation section 120b of the step 120. The elastic preload provides preload force, adaptively compensating for gap changes between the diameter variation section 220b of the shoulder 220 and the diameter variation section 120b of the step 120 caused by factors such as temperature variations, preventing loosening and improving the reliability of the fit between the pin 200 and the torque arm 100. Furthermore, the elastic preload can absorb vibration energy between the pin 200 and the torque arm 100, suppressing the risk of the pin 200 loosening.

[0039] In some embodiments, the surface of the shoulder 220 and / or the surface of the step 120 are coated with a damping layer. The damping layer absorbs and dissipates vibration energy, preventing the pin 200 from loosening and optimizing the coefficient of friction between the shoulder 220 and the step 120, reducing wear and thus enhancing the reliability of the fit between the pin 200 and the torque arm 100. The damping layer is specifically, for example, a polyetheretherketone (PEEK) layer, but is not limited thereto.

[0040] 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. Through the axial stop fit structure between the pin 200 and the torque arm 100, the double-stage pressure fit design, and the shoulder 220 set in the central area of ​​the pin 200, the axial migration problem of the pin 200 is effectively solved, so that the wind turbine gearbox is stably connected to the wind turbine generator set by the torque arm 100 and the pin 200, ensuring the reliable operation of the wind turbine gearbox and the wind turbine generator set, and reducing the weight of the pin 200 to achieve a lightweight design.

[0041] 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 shaft is arranged in a shaft hole of the torque arm, characterized in that: a shoulder is arranged in a central region of the pin shaft in an axial direction, a stepped portion is arranged in a central region of the shaft hole in an axial direction, shaft portions of the pin shaft on both sides of the shoulder are respectively interference-fitted in hole segments of the shaft hole on both sides of the stepped portion, and the shoulder and the stepped portion form an axial stop cooperation structure. The central region of the pin shaft extends to both sides with the axial midpoint of the pin shaft as the center, and the axial length of the central region of the pin shaft is less than or equal to 20% of the axial length of the pin shaft.

2. A wind turbine gearbox according to claim 1, characterised in that The central region of the shaft hole extends to both sides with the axial midpoint of the shaft hole as the center, and the axial length of the central region of the shaft hole is less than or equal to 20% of the axial length of the shaft hole. The axial lengths of the shaft portions of the pin shaft on both sides of the shoulder are equal, and the axial lengths of the hole segments of the shaft hole on both sides of the stepped portion are equal.

3. A wind turbine gearbox according to claim 2, wherein The shaft portions of the pin shaft on both sides of the shoulder include a first shaft portion with a larger diameter and a second shaft portion with a smaller diameter, and the hole segments of the shaft hole on both sides of the stepped portion include a first hole segment with a larger diameter and a second hole segment with a smaller diameter.

4. The wind turbine gearbox of claim 2, wherein, The axial length of the first shaft portion is greater than the axial length of the second shaft portion, and the axial length of the first hole segment is greater than the axial length of the second hole segment. The shaft portions of the pin shaft on both sides of the shoulder include a first shaft portion with a larger diameter and a second shaft portion with a smaller diameter, and the hole segments of the shaft hole on both sides of the stepped portion include a first hole segment with a larger diameter and a second hole segment with a smaller diameter.

5. The wind turbine gearbox of claim 1, wherein, The interference amount between the first shaft portion and the first hole segment is greater than the interference amount between the second shaft portion and the second hole segment. An elastic pre-tightening member is pressed between the diameter change section of the shoulder and the diameter change section of the stepped portion.

6. The wind turbine gearbox of claim 1, wherein, The diameter change corner of the shoulder and the diameter change corner of the stepped portion are formed as a circular arc transition corner.

7. The wind turbine gearbox of claim 1, wherein, The surface of the shoulder and / or the surface of the stepped portion is coated with a damping layer.

8. The wind turbine gearbox of claim 1, wherein, The torque arm and the gearbox are formed as an integral structure.

9. A wind turbine gearbox according to any of claims 1-8, characterised in that Of the two ends of the pin shaft, the end connected to the larger diameter shaft portion is used to connect the wind wheel side housing, and the end connected to the smaller diameter shaft portion is used to connect the generator side housing. The wind turbine generator set is provided with the wind power gearbox according to any one of claims 1-9.

10. A wind power unit, characterized in that ​

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