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, the part of the torque arm serves as a bearing seat, the torque arm is provided with a boss axially extending from the outer edge of the bearing seat, the boss and the end face of the bearing seat form a bearing groove, a bearing cover is embedded in the bearing groove, and the bearing cover is in press fit with the boss in the radial direction and in press fit with the end face of the bearing seat in the axial direction. The bearing cover and the bearing seat are connected in a fastening mode through a fastening piece, and the bearing seat and the bearing cover jointly support a tapered roller bearing of a planet carrier of the wind power gear box. The bearing cover and the bearing seat form an integral structure and are tightly matched to jointly resist axial acting force and radial acting force generated in the operation process of the tapered roller bearing, so that the bearing seat and the bearing cover jointly and stably support the tapered roller bearing of the planet carrier of the wind power gear box, and stable operation of the wind power gear box is ensured.

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] Wind turbine gearboxes, under conditions of high combined loads and strict axial constraints, require the use of tapered roller bearings to support the planetary carrier. During operation, tapered roller bearings generate complex axial and radial forces, which can lead to problems such as deformation of the bearing housing supporting the bearing and loosening between the bearing housing and the bearing cap, affecting the stability and reliability of the wind turbine gearbox.

[0003] 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

[0004] In view of this, the present invention provides a wind turbine gearbox and a wind turbine generator set to solve the problems of easy deformation of the bearing housing of the tapered roller bearing supporting the planetary carrier and easy loosening between the bearing housing and the bearing cover.

[0005] According to one aspect of the present invention, a wind turbine gearbox is provided. The gearbox housing is provided with a torque arm, a portion of which serves as a bearing housing. The torque arm is provided with a boss extending axially from the outer edge of the bearing housing. The boss and the end face of the bearing housing form a support groove. A bearing cover is embedded in the support groove. The bearing cover is pressed against the boss in the radial direction and against the end face of the bearing housing in the axial direction. The bearing cover and the bearing housing are fastened together by fasteners. The bearing housing and the bearing cover together support the tapered roller bearing of the planetary carrier of the wind turbine gearbox.

[0006] In some embodiments, the fastener includes bolts spaced apart in the circumferential direction.

[0007] In some embodiments, the fastener further includes pins spaced apart in a circumferential direction, and the pins are alternately spaced apart from the bolts.

[0008] In some embodiments, the pin is a cylindrical pin or a conical pin.

[0009] In some embodiments, a disc spring washer is pressed between the end face of the bolt and the bearing cap.

[0010] In some embodiments, the end face of the boss does not extend axially beyond the end face of the bolt, and the end face of the pin does not extend axially beyond the end face of the bolt.

[0011] In some embodiments, the boss is tilted relative to the axial direction, causing the support groove to form a tapered groove, and the sidewall of the bearing cap is adapted to the boss and tilted.

[0012] In some embodiments, the inner wall of the boss is connected to the end face of the bearing seat by a rounded transition, and the outer wall of the boss is connected to the torque arm by a rounded transition.

[0013] In some embodiments, the outer wall of the boss is provided with reinforcing ribs.

[0014] 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.

[0015] The beneficial effects of this utility model compared with the prior art include at least the following:

[0016] In this invention, the torque arm serves as a bearing housing, enhancing its structural strength. The torque arm features a boss extending axially from the outer edge of the bearing housing. This boss serves as a reinforcing structure for the bearing housing and also forms a support groove with the end face of the bearing housing, allowing the bearing cover to be stably embedded in the groove. The bearing cover is pressed against the boss radially and against the end face of the bearing housing axially. The bearing cover and bearing housing are securely connected by fasteners, forming a tight, integrated structure that resists the axial and radial forces generated by the tapered roller bearing during operation. This prevents bearing housing deformation and loosening between the bearing housing and the bearing cover, ensuring stable support of the tapered roller bearings on the planetary carrier of the wind turbine gearbox. This, in turn, ensures the stable operation of the planetary carrier and, consequently, the wind turbine gearbox and the entire wind turbine generator set.

[0017] 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

[0018] 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.

[0019] Figure 1 A partial cross-sectional view of the wind turbine gearbox in an embodiment of this utility model is shown.

[0020] Figure 2This diagram shows a partial top view of the wind turbine gearbox in an embodiment of the present invention. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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. 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.

[0024] 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.

[0025] Figure 1 The diagram illustrates a partial cross-sectional view of the wind turbine gearbox in an embodiment of this utility model, with reference to... Figure 1 As shown, the wind turbine gearbox provided in this embodiment of the present invention has a torque arm 100, part of which serves as a bearing seat 110. The torque arm 100 has a boss 120 extending axially from the outer edge of the bearing seat 110. The boss 120 and the end face 110a of the bearing seat 110 form a support groove. A bearing cover 200 is embedded in the support groove. The bearing cover 200 is pressed against the boss 120 in the radial direction X and against the end face 110a of the bearing seat 110 in the axial direction Z. The bearing cover 200 and the bearing seat 110 are fastened together by fasteners 300. The bearing seat 110 and the bearing cover 200 together support the tapered roller bearing 500 of the planetary carrier 400 of the wind turbine gearbox.

[0026] In this invention, the torque arm 100 serves as a bearing housing 110, enhancing its structural strength. The torque arm 100 is provided with a boss 120 extending axially from the outer edge of the bearing housing 110. The boss 120, as a reinforcing structure of the bearing housing 110, significantly increases the moment of inertia of the bearing housing 110 by increasing the height and width of its local cross-section. Furthermore, the boss 120 disperses the bending stress originally concentrated in the base of the bearing housing 110 to a wider cross-sectional area, reducing local stress peaks. Additionally, the boss 120 enhances the bending stiffness of the bearing housing 110 and suppresses its radial expansion.

[0027] Furthermore, the boss 120 forms a support groove with the end face 110a of the bearing housing 110, allowing the bearing cover 200 to be stably embedded in the support groove. The bearing cover 200 is press-fitted with the boss 120 in the radial direction X and with the end face 110a of the bearing housing 110 in the axial direction Z. The bearing cover 200 and the bearing housing 110 are fastened together by fasteners 300, forming an integral structure with a tight fit. This structure jointly resists the axial and radial forces generated by the tapered roller bearing 500 during operation, preventing problems such as deformation of the bearing housing 110 and loosening between the bearing housing 110 and the bearing cover 200. The bearing housing 110 and the bearing cover 200 together stably support the tapered roller bearing 500 of the planetary carrier 400 of the wind turbine gearbox, ensuring the stable operation of the planetary carrier 400, and thus ensuring the stable operation of the wind turbine gearbox and the entire wind turbine generator set.

[0028] The press fit between the torque arm 100 and the bearing cover 200 can be a slightly interference fit, so that the bearing cover 200 and the torque arm 100 can support each other when bearing the axial and radial loads transmitted by the tapered roller bearing 500 of the planetary carrier 400. This counteracts the radial expansion tendency caused by the axial force, reduces the risk of deformation of the bearing housing 110 and the risk of loosening of the bearing cover 200, ensures the positional accuracy of the bearing housing 110, and reserves an expansion gap to avoid interference between the torque arm 100 and the bearing cover 200 due to thermal expansion during the operation of the wind turbine gearbox.

[0029] Thanks to the deformation control of the bearing housing 110 by the above structural design, the size of the bearing housing 110 can be appropriately reduced under actual working conditions, achieving lightweight design and improving cost-effectiveness.

[0030] Figure 2 The diagram illustrates a partial top view of the wind turbine gearbox in an embodiment of this utility model, combined with... Figure 1 and Figure 2 As shown, in some embodiments, the fastener 300 includes bolts 300a spaced apart in the circumferential direction. The bolts 300a enable a convenient and secure connection between the bearing cap 200 and the bearing seat 110.

[0031] Furthermore, in some embodiments, the fastener 300 also includes pins 300b spaced apart in the circumferential direction, with the pins 300b and bolts 300a alternating in spacing. The bolts 300a axially tighten the bearing cover 200 and the bearing seat 110, and the pins 300b combine to form a shear-resistant connection between the bearing cover 200 and the bearing seat 110, effectively resisting deformation of the bearing seat 110 and loosening of the bearing cover 200, thus forming an integral composite structure between the bearing cover 200 and the bearing seat 110, ensuring a stable connection. The number of bolts 300a, the number of pins 300b, and the spacing between bolts 300a and pins 300b can be designed as needed.

[0032] In some embodiments, pin 300b is a cylindrical pin or a conical pin. Cylindrical pins are easy to manufacture, have low cost, and can withstand both axial and radial loads simultaneously; conical pins have high self-locking capability, can generate radial expansion force after assembly, provide stronger shear resistance and interfacial contact pressure, and further lock the bearing cap 200 and bearing housing 110. In specific implementations, a suitable pin 300b can be selected according to design requirements.

[0033] In some embodiments, a disc spring washer is pressed between the end face 110a of the bolt 300a and the bearing cap 200. The disc spring washer has excellent load-bearing and shock absorption capabilities, which can significantly improve the connection strength and anti-loosening performance between the bolt 300a and the bearing cap 200.

[0034] In some embodiments, the end face of the boss 120 does not extend axially beyond the end face of the bolt 300a, and the end face of the pin 300b does not extend axially beyond the end face of the bolt 300a. Using the end face of the bolt 300a as a reference plane, the end faces of the boss 120 and the pin 300b can be flush with or appropriately recessed from the reference plane to avoid interference with other components (e.g., the wind turbine housing) when the wind turbine gearbox is assembled to the wind turbine generator set.

[0035] In some embodiments, the boss 120 is inclined relative to the axial direction, forming a tapered groove for the support groove, and the sidewall of the bearing cap 200 is adapted to be inclined to fit the boss 120. The mating surface 222 between the bearing cap 200 and the torque arm 100 is designed with a slight taper so that after assembly, the axial load generates an additional radial clamping force through the mating surface 222 to resist the radial expansion tendency of the torque arm 100 and enhance the radial compressive strength of the bearing housing 110.

[0036] In some embodiments, the inner wall of the boss 120 is connected to the end face 110a of the bearing housing 110 by a rounded transition, and the outer wall of the boss 120 is connected to the torque arm 100 by a rounded transition. Right-angle transitions are prone to stress concentration, while rounded transitions can effectively disperse stress and improve fatigue strength.

[0037] In some embodiments, the outer wall of the boss 120 may also be provided with reinforcing ribs (not specifically shown in the figure), which may extend from the body of the torque arm 100 to the outer wall of the boss 120 to further improve the rigidity and bending resistance of the boss 120.

[0038] 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, and the wind turbine gearbox is connected between the wind turbine and the generator of the wind turbine generator set. The wind turbine gearbox forms a support groove with the boss 120 and the end face 110a of the bearing housing 110, so that the bearing cover 200 is stably embedded in the support groove. The bearing cover 200 is pressed with the boss 120 in the radial direction X and pressed with the end face 110a of the bearing housing 110 in the axial direction Z. The bearing cover 200 and the bearing housing 110 are fastened together by fasteners 300, so that the bearing cover 200 and the bearing housing 110 form an integral structure with tight fit, which together resists the axial and radial forces generated by the tapered roller bearing 500 during operation, avoids problems such as deformation of the bearing housing 110 and loosening of the bearing cover 200, and allows the bearing housing 110 and the bearing cover 200 to stably support the tapered roller bearing 500 of the planetary carrier 400 of the wind turbine gearbox, ensuring the stable operation of the planetary carrier 400, and thus ensuring the stable operation of the wind turbine gearbox and the entire wind turbine generator set. Furthermore, thanks to the deformation control of the bearing housing 110, the size of the bearing housing 110 can be appropriately reduced under actual working conditions, thereby achieving a lightweight design of the wind turbine gearbox and the entire wind turbine generator set and improving cost-effectiveness.

[0039] 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, wherein the gearbox housing is provided with a torque arm, characterized in that: The torque arm portion serves as a bearing housing. The torque arm is provided with a boss extending axially from the outer edge of the bearing housing. The boss and the end face of the bearing housing form a support groove. A bearing cover is embedded in the support groove. The bearing cover is pressed against the boss in the radial direction and against the end face of the bearing housing in the axial direction. The bearing cover and the bearing housing are fastened together by fasteners. The bearing housing and the bearing cover together support the tapered roller bearing of the planetary carrier of the wind turbine gearbox.

2. The wind turbine gearbox as described in claim 1, characterized in that, The fasteners include bolts spaced apart in the circumferential direction.

3. The wind turbine gearbox as described in claim 2, characterized in that, The fastener also includes pins spaced apart in the circumferential direction, and the pins are alternately spaced apart from the bolts.

4. The wind turbine gearbox as described in claim 3, characterized in that, The pin is a cylindrical pin or a conical pin.

5. The wind turbine gearbox as described in claim 2, characterized in that, A disc spring washer is pressed between the end face of the bolt and the bearing cap.

6. The wind turbine gearbox as described in claim 3, characterized in that, The end face of the boss does not extend beyond the end face of the bolt in the axial direction, and the end face of the pin does not extend beyond the end face of the bolt in the axial direction.

7. The wind turbine gearbox as described in claim 1, characterized in that, The boss is inclined relative to the axial direction, so that the support groove forms a conical groove, and the sidewall of the bearing cover is adapted to the boss and is inclined.

8. The wind turbine gearbox as described in claim 1, characterized in that, The inner wall of the boss is connected to the end face of the bearing seat by a rounded transition, and the outer wall of the boss is connected to the torque arm by a rounded transition.

9. The wind turbine gearbox as described in claim 1, characterized in that, The outer wall of the boss is provided with reinforcing ribs.

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.

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