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. The wind power gear box comprises a planetary gear set contained in a shell, a planet carrier of the planetary gear set is supported on a bearing seat through a planet carrier bearing, the bearing seat serves as one end of a torque arm, and the other end of the torque arm is fixedly connected with the shell; a radial hole is formed in the bearing seat, a slot is formed in a bearing outer ring of the planet carrier bearing, and the bearing outer ring and the bearing seat are locked and fixed through a locking pin which penetrates through the radial hole and extends into the slot; the axial end face of the bearing seat is in sealing fit with an end cover of the wind power gear box through a sealing ring. According to the utility model, the locking fit between the bearing outer ring and the bearing seat can be effectively realized, so that the planet carrier is stably supported on the bearing seat through the planet carrier bearing, and the integral stable operation of the planet carrier, the planet gear set and the wind power gear box is ensured. In addition, effective sealing fit between the axial end face of the bearing seat and the end cover is achieved through a sealing ring.

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] The wind turbine gearbox contains a planetary gear set to increase the rotor speed to the speed required by the generator. Within the planetary gear set, the planet carrier plays a crucial role in torque transmission and is supported by planet carrier bearings on a bearing housing. To achieve a fixed connection between the bearing outer ring and the bearing housing and ensure stable operation of the planet carrier, the current method involves creating an axial hole on the end face of the bearing housing. A retaining pin is inserted into this hole to fill the gap between the bearing outer ring and the bearing housing. The exposed end of the retaining pin is used to secure the end cover of the gearbox.

[0003] The current axial fixing method has the following problems: on the one hand, axial fixing cannot effectively prevent torsion between the bearing outer ring and the bearing housing; on the other hand, opening an axial hole on the end face of the bearing housing disrupts the continuity of the end face, resulting in an inability to achieve an effective sealing fit between the bearing housing and the end cover.

[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 current axial fixing method cannot effectively achieve the locking fit between the outer ring of the bearing and the bearing housing, as well as the sealing fit between the bearing housing and the end cover.

[0006] According to one aspect of the present invention, a wind turbine gearbox is provided, comprising a planetary gear set housed in a housing, wherein the planet carrier of the planetary gear set is supported on a bearing housing by a planet carrier bearing, wherein: the bearing housing serves as one end of a torque arm, and the other end of the torque arm is fixedly connected to the housing; the bearing housing is provided with a radial hole, and the outer ring of the planet carrier bearing is provided with a slot, wherein the outer ring of the bearing and the bearing housing are locked and fixed by a locking pin passing through the radial hole and extending into the slot; the axial end face of the bearing housing and the end cover of the wind turbine gearbox are sealed together by a sealing ring.

[0007] In some embodiments, the radial hole avoids the axial end face, which is formed as an end face that extends continuously in the circumferential direction.

[0008] In some embodiments, the radial hole and the slot form a stepped slot, and the locking pin has a stepped profile that adapts to the stepped slot.

[0009] In some embodiments, the end cap is provided with a shoulder protruding toward the outer ring of the bearing, and the shoulder, the slot, and the radial hole together form the stepped groove.

[0010] In some embodiments, the connection between the shoulder and other parts of the end cap forms a corner, and the sealing ring is disposed at the corner and pressed between the corner and the corner of the axial end face.

[0011] In some embodiments, the locking pin is interference-fitted with the radial hole, the slot, and the shoulder, respectively.

[0012] In some embodiments, the outer wall of the locking pin and / or the inner wall of the stepped slot are coated with an adhesive.

[0013] In some embodiments, the locking pins include a plurality of pins, which are arranged uniformly or non-uniformly in the circumferential direction.

[0014] In some embodiments, a space is provided between the locking pin and the opening of the radial hole, and a threaded plug for pressing the locking pin is also provided in the space.

[0015] In some embodiments, the bearing housing and the torque arm form an integral structure, and / or the torque arm and the housing form an integral structure.

[0016] According to another aspect of the present invention, a wind turbine generator set is provided, the wind turbine generator set being equipped with a wind turbine gearbox as described in any of the above embodiments, the wind turbine gearbox being connected between the wind turbine rotor and the generator of the wind turbine generator set.

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

[0018] This invention achieves a locking and fixing mechanism between the bearing outer ring and the bearing housing by passing a locking pin through the radial hole of the bearing housing and extending into the slot of the bearing outer ring of the planetary carrier bearing. Compared with axial fixing methods, this invention can effectively achieve a locking fit between the bearing outer ring and the bearing housing, ensuring that the planetary carrier is stably supported on the bearing housing by the planetary carrier bearing, thus ensuring the stable operation of the planetary carrier and planetary gear set.

[0019] The bearing housing of this invention serves as one end of a torque arm, while the other end of the torque arm is fixedly connected to the housing. The torque arm converts the torque borne by the outer ring of the bearing into a static reaction force, preventing the outer ring of the bearing from rotating and providing rigid support for the outer ring of the bearing, thus ensuring the stability of the planetary carrier bearing under high-speed and high-load conditions.

[0020] This utility model integrates the radial locking between the outer ring of the bearing and the bearing housing, as well as the design of the bearing housing as part of the torque arm, to effectively balance the torque, fix the outer ring of the bearing, and ensure the stable operation of the planetary carrier bearing, thereby ensuring the stable operation of the planetary carrier, planetary gear set and the entire wind turbine gearbox.

[0021] Furthermore, the axial end face of the bearing housing of this invention does not require a hole and can serve as the bearing surface for the sealing ring. Therefore, an effective sealing fit can be achieved between the axial end face of the bearing housing and the end cover through the sealing ring. The end cover is used to seal and protect components such as the planetary carrier bearing, further ensuring the stable operation of the planetary gear set and the entire wind turbine gearbox.

[0022] 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

[0023] 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.

[0024] Figure 1 This diagram shows a partial cross-sectional view of a wind turbine gearbox in an embodiment of the present invention.

[0025] Figure 2 This diagram shows a partial cross-sectional view of the wind turbine gearbox in another embodiment of the present invention. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] In the description of this utility model, the terms "axial," "radial," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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 this utility model. The term "multiple" means two or more, unless otherwise explicitly specified. Furthermore, in the description of this utility model, unless otherwise explicitly 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.

[0029] 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.

[0030] Figure 1 and Figure 2 This illustration shows partial cross-sectional views of the wind turbine gearbox from two perspectives in an embodiment of the present invention. Figure 1 and Figure 2 As shown, the wind turbine gearbox provided in this embodiment of the present invention includes a planetary gear set housed in a housing. The planet carrier 100 of the planetary gear set is supported on a bearing seat 310 by a planet carrier bearing 200, wherein:

[0031] The bearing housing 310 serves as one end of the torque arm 300, and the other end of the torque arm 300 is fixedly connected to the housing;

[0032] The bearing housing 310 is provided with a radial hole 311, and the outer ring 210 of the planetary carrier bearing 200 is provided with a slot 211. The outer ring 210 of the bearing and the bearing housing 310 are locked and fixed by a locking pin 400 that passes through the radial hole 311 and extends into the slot 211.

[0033] The axial end face of the bearing housing 310 is sealed to the end cover 500 of the wind turbine gearbox by a sealing ring 600.

[0034] This invention achieves a locking and fixing mechanism between the bearing outer ring 210 and the bearing housing 310 by passing a locking pin 400 through the radial hole 311 of the bearing housing 310 and extending into the slot 211 of the bearing outer ring 210 of the planetary carrier bearing 200. Compared with axial fixing methods, this invention can effectively achieve a locking fit between the bearing outer ring 210 and the bearing housing 310, so that the planetary carrier 100 is stably supported on the bearing housing 310 by the planetary carrier bearing 200, thereby ensuring the stable operation of the planetary carrier 100 and the planetary gear set. In this invention, axial direction Z refers to the direction along the axis of the planetary carrier 100, and radial direction X is the direction perpendicular to axial direction Z.

[0035] The bearing outer ring 210 and bearing housing 310 of this utility model are fixed by radial locking, which can achieve the following three beneficial effects. First, it enhances the resistance to radial loads: the bearing outer ring 210 mainly bears radial loads, and the installation direction of the locking pin 400 is consistent with the load direction, which can better withstand shear stress, directly resist radial force, and prevent relative sliding between the bearing outer ring 210 and bearing housing 310; if an axial fixing method is used, the fixing pin mainly bears axial tensile or compressive force, and the resistance to radial loads depends on friction and fit clearance, which is prone to failure under high vibration, impact and other working conditions. Secondly, it avoids stress concentration due to thermal expansion: During operation, the planetary carrier bearing 200 will experience thermal expansion due to friction and changes in ambient temperature. The radial locking method allows the outer ring 210 some free axial expansion and contraction space, preventing the planetary carrier bearing 200 from seizing or experiencing stress concentration due to thermal expansion. If an axial fixing method were used, the gap between the outer ring 210 and the inner ring 220 would be compressed, potentially leading to deformation or even damage to the planetary carrier bearing 200 when the expansion of the outer ring 210 is hindered. Thirdly, it improves vibration and impact resistance: The radial locking method is less prone to loosening under high vibration and impact loads, and even slight wear on the outer ring 210 does not affect the tightness of the fit. If an axial fixing method were used, the retaining pin would rely on friction for fixation, which is prone to loosening and failure under long-term vibration. Therefore, the bearing outer ring 210 and bearing housing 310 of this utility model are fixed by radial locking, which can ensure that the bearing outer ring 210 has no displacement under extreme torque conditions, while allowing axial thermal expansion, so that the planetary carrier 100 is stably supported on the bearing housing 310 by the planetary carrier bearing 200, ensuring the stable operation of the planetary carrier 100 and the planetary gear set.

[0036] The bearing housing 310 of this utility model serves as one end of the torque arm 300, and the other end of the torque arm 300 is fixedly connected to the housing. The torque borne by the bearing outer ring 210 is converted into a static reaction force through the torque arm 300, which prevents the bearing outer ring 210 from rotating and provides rigid support for the bearing outer ring 210, thus ensuring the stability of the planetary carrier bearing 200 under high-speed and high-load conditions.

[0037] Specifically, the torque arm 300, as a key component in the wind turbine gearbox, is used to transmit and balance torque, and also serves to fix the outer ring 210 of the bearing. The torque arm 300 can adopt a rigid arm-like structure, with one end serving as a bearing housing 310, locking into the outer ring 210 of the planetary carrier bearing 200, and the other end fixed to the housing of the wind turbine gearbox, or connected as part of the housing to an external structure (such as the frame). The torque arm 300 converts the torque borne by the outer ring 210 of the bearing into a static reaction force, preventing the outer ring 210 of the bearing from twisting or displacing due to the torque reaction force. The torque arm 300 provides rigid support for the outer ring 210 of the bearing, ensuring the stability of the planetary carrier bearing 200 under high-speed, high-load conditions. In the planetary gear set, the inner ring 220 of the planetary carrier bearing 200 is connected to the shaft of the planetary carrier 100 and rotates with the shaft, while the outer ring 210 is locked by the torque arm 300. This design transfers the dynamic load of the rotating components to the static structure, reducing vibration and energy loss, and extending the life of the wind turbine gearbox. Furthermore, in wind turbines, the gearbox needs to withstand extremely high power impact loads. The torque arm 300 disperses the torque through the lever arm effect and, as part of the gearbox support structure, shares the load with the housing, avoiding localized stress concentration and effectively improving reliability.

[0038] The bearing housing 310 and the torque arm 300 can form an integral structure to enhance the overall structural strength, and / or the torque arm 300 and the housing can form an integral structure. The specific structure can be determined based on design requirements, taking into account structural strength, compactness, and ease of assembly.

[0039] This utility model integrates the radial locking and fixing between the outer ring 210 of the integrated bearing and the bearing housing 310, and the design of the bearing housing 310 as part of the torque arm 300. This effectively balances the torque, fixes the outer ring 210 of the bearing, ensures the stable operation of the planetary carrier bearing 200, and thus ensures the stable operation of the planetary carrier 100, the planetary gear set and the entire wind turbine gearbox.

[0040] Furthermore, the axial end face of the bearing housing 310 of this invention does not require a hole and can serve as the bearing surface for the bearing seal ring 600. Therefore, an effective sealing fit can be achieved between the axial end face of the bearing housing 310 and the end cover 500 through the sealing ring 600. The end cover 500 provides sealing protection for components such as the planetary carrier bearing 200, further ensuring the stable operation of the planetary gear set and the entire wind turbine gearbox.

[0041] In some embodiments, the radial hole 311 avoids the axial end face of the bearing housing 310, making the axial end face a continuous end face extending in the circumferential direction. The continuous axial end face stably supports the sealing ring 600, firmly pressing it between the axial end face of the bearing housing 310 and the end cover 500, thereby achieving a stable connection between the end cover 500 and the torque arm 300. This effectively overcomes the problem in axial fixing methods where the lack of a continuous bearing end face due to the end face opening prevents a sealing connection between the bearing housing and the end cover using a sealing ring.

[0042] In some embodiments, the radial hole 311 and the slot 211 form a stepped groove, and the locking pin 400 has a stepped profile that adapts to the stepped groove. By engaging the stepped profile with the stepped groove, multi-level load-bearing and vibration-resistant self-locking are achieved, significantly improving the connection reliability between the locking pin 400 and the bearing outer ring 210 and the bearing housing 310.

[0043] Specifically, on the one hand, the locking pin 400 and the stepped slot form a multi-level contact surface, which, compared to a single cylindrical surface fit, increases the contact area, reduces the pressure per unit area, and avoids deformation and wear caused by local stress concentration. On the other hand, the multi-level contact surface bearing enhances locking reliability. The stepped structure can generate a self-locking effect under vibration conditions, using the stepped limit to achieve a stop, preventing the locking pin 400 from moving or displacing, effectively improving the anti-vibration loosening ability of the locking pin 400, and thus ensuring the tight locking and fixation between the bearing outer ring 210 and the bearing housing 310. Furthermore, the stepped profile has a progressive guiding effect during insertion into the stepped slot, reducing the difficulty of assembly alignment and improving assembly efficiency. Moreover, the stepped fit structure of the stepped profile and the stepped slot allows for the placement of seals (such as O-rings) between adjacent steps, increasing the tightness of the fit. Furthermore, the stepped fit structure can adapt to complex load conditions. For example, the small diameter section of the locking pin 400 can be mainly used to bear torque or axial force, while the large diameter section of the locking pin 400 can be mainly used to bear radial shear force, thereby improving stability through graded load transfer.

[0044] In some embodiments, the end cap 500 is provided with a shoulder 510 protruding toward the outer ring 210 of the bearing, and the shoulder 510, the slot 211 and the radial hole 311 together form a stepped groove. In this way, the locking pin 400, the bearing seat 310, the outer ring 210 of the bearing and the end cap 500 are tightly fitted together.

[0045] In some embodiments, the connection between the shoulder 510 and other parts of the end cover 500 forms a corner, and the sealing ring 600 is disposed at the corner and pressed between the corner and the axial end face of the bearing housing 310. The corner can be an L-shaped corner, but is not limited thereto. If an L-shaped corner is formed, the structural strength of the shoulder 510 can be increased, ensuring that the shoulder 510 can withstand assembly pressure and working load, avoiding deformation leading to failure, and facilitating the joint cooperation of the shoulder 510, the slot 211, and the radial hole 311 to form a stepped groove. The sealing ring 600 is disposed at the corner and pressed between the corner of the bearing housing 310 and the corner of the end cover 500 to achieve a stable fit between the bearing housing 310 and the end cover 500.

[0046] In some embodiments, the locking pin 400 is interference-fitted with the radial hole 311, the slot 211, and the shoulder 510, respectively, wherein the interference amount of different stepped sections can be set to be the same or different as needed. For example, in some embodiments, positioning and locking can be achieved by controlling the interference amount in stages. Specifically, the small-diameter section of the locking pin 400 has a first-level interference amount with the bearing outer ring 210 and the end cap 500, and the large-diameter section of the locking pin 400 has a second-level interference amount with the bearing seat 310. The first-level interference amount can be slightly larger than the second-level interference amount, but is not limited thereto.

[0047] In some embodiments, the outer wall of the locking pin 400 and / or the inner wall of the stepped slot are coated with an adhesive. The inner wall of the stepped slot may be one or more of a radial hole 311, a slot 211, and a shoulder 510. The adhesive bonding enhances the locking strength between the locking pin 400 and the bearing housing 310, the bearing outer ring 210, and the end cap 500.

[0048] In existing axial fixing methods, silicone sealant is used to seal the contact surfaces of the fixing pin and bearing housing to achieve a stable connection. However, silicone sealant reduces the friction coefficient of the sealing surface, affecting the stable fit between the end cover and the bearing housing. This invention effectively improves the reliability of the fit between the bearing outer ring 210, bearing housing 310, and end cover 500 through radial locking, continuous axial end face bearing sealing rings, and stepped fit structure, ensuring long-term stable operation of the wind turbine gearbox under complex working conditions.

[0049] In some embodiments, the locking pins 400 include multiple pins, which are uniformly or non-uniformly distributed in the circumferential direction. A uniform circumferential distribution of the locking pins 400 can evenly distribute the load and reduce the shear stress of individual pins. A non-uniform circumferential distribution of the locking pins 400 can disrupt rotational symmetry, enhance the locking force between the bearing outer ring 210 and the bearing housing 310, and prevent relative rotation between the bearing outer ring 210 and the bearing housing 310. Specifically, for example, in high-vibration environments, the locking pins 400 can adopt an asymmetrical layout to reduce the risk of loosening caused by resonance; in high-torque transmission scenarios, the locking pins 400 can adopt a symmetrical or asymmetrical layout to disperse stress concentration points.

[0050] Furthermore, in some embodiments, a space is left between the locking pin 400 and the opening of the radial hole 311, and a threaded plug (not specifically shown in the figure) is also provided in this space to tighten the locking pin 400. By tightening the locking pin 400 with the threaded plug, a double lock is formed, effectively ensuring that the outer ring 210 of the bearing and the bearing housing 310 are locked and fixed.

[0051] This utility model embodiment also provides a wind turbine generator set, which is equipped with the wind turbine gearbox described in any of the above embodiments. The wind turbine gearbox is connected between the wind turbine rotor and the generator of the wind turbine generator set. The stable operation of the planetary gear set is ensured by radial locking between the outer ring 210 of the bearing and the bearing housing 310. A torque arm 300 provides stable support for the outer ring 210 of the bearing, ensuring the stability of the planetary gear set under high-speed and high-load conditions. Furthermore, a sealing ring 600 is pressed between the axial end face of the bearing housing 310 and the end cover 500 to achieve a sealed fit. Thus, the stable operation of the planetary gear set, the wind turbine gearbox, and the wind turbine generator set as a whole is ensured.

[0052] 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 turbine gearbox, comprising a planetary gear set housed in a housing, wherein the planet carrier of the planetary gear set is supported on a bearing housing by a planet carrier bearing, characterized in that: The bearing housing serves as one end of the torque arm, and the other end of the torque arm is fixedly connected to the housing. The bearing housing is provided with a radial hole, and the outer ring of the planetary carrier bearing is provided with a slot. The outer ring of the bearing and the bearing housing are locked and fixed by a locking pin that passes through the radial hole and extends into the slot. The axial end face of the bearing housing and the end cover of the wind turbine gearbox are sealed together by a sealing ring.

2. The wind turbine gearbox as described in claim 1, characterized in that, The radial hole avoids the axial end face, which is formed as an end face that extends continuously in the circumferential direction.

3. The wind turbine gearbox as described in claim 1, characterized in that, The radial hole and the slot form a stepped groove, and the locking pin has a stepped profile that adapts to the stepped groove.

4. The wind turbine gearbox as described in claim 3, characterized in that, The end cap is provided with a shoulder protruding towards the outer ring of the bearing, and the shoulder, the slot and the radial hole together form the stepped groove.

5. The wind turbine gearbox as described in claim 4, characterized in that, The connection between the shoulder and other parts of the end cap forms a corner, and the sealing ring is disposed at the corner and pressed between the corner and the axial end face.

6. The wind turbine gearbox as described in claim 4, characterized in that, The locking pin is interference-fitted with the radial hole, the slot, and the shoulder, respectively.

7. The wind turbine gearbox as described in claim 4, characterized in that, The outer wall of the locking pin and / or the inner wall of the stepped slot are coated with adhesive.

8. The wind turbine gearbox as described in claim 1, characterized in that, The locking pins include multiple pins, which are arranged uniformly or non-uniformly in the circumferential direction.

9. The wind turbine gearbox as described in claim 1, characterized in that, There is a space between the locking pin and the opening of the radial hole, and a threaded plug that tightens the locking pin is also provided in the space.

10. A wind turbine generator set, characterized in that, The wind turbine generator set is equipped with a wind turbine gearbox as described in any one of claims 1-9, the wind turbine gearbox being connected between the wind turbine rotor and the generator of the wind turbine generator set.

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