Gearbox intermediate shaft assembly, gearbox and wind generating set
By designing the gearbox intermediate shaft assembly, using cast iron material connectors and spline shafts of medium carbon alloy steel, the problem of high production cost of gearbox high-speed intermediate shafts in wind turbines is solved, and the effect of reducing production costs is achieved.
Patent Information
- Application Number
- CN202311285956.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-28
- Publication Date
- 2025-01-14
AI Technical Summary
The production cost of gearbox high-speed intermediate shafts of existing wind turbines is high, mainly because the use of medium carbon alloy steel materials to meet the hardness requirements, resulting in higher costs.
Design a gear box intermediate shaft assembly, including a connector, gear outer ring and spline shaft, by connecting the spline shaft and gear outer ring to the connector, and using cast iron material with low material hardness to prepare the connector. Reduce production costs.
By reducing the material hardness of the connector and using lower-cost cast iron materials, the overall production cost is reduced, while meeting the hardness requirements of power transmission, and reducing the production cost of wind turbines.
Smart Images
Figure CN119308991A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of wind power generation, and in particular to a gearbox intermediate shaft assembly, a gearbox and a wind power generator set. Background Art
[0002] The current wind turbine gearbox high-speed intermediate shaft, such as Figure 1 As shown, it includes two parts, a solid large gear 20a and a shaft body 10a with a spline structure 110a. The solid large gear 20a has an axial hole 220a and an outer ring 210a with meshing teeth. The solid large gear 20a is interference-fitted on the outer circumference of the shaft body 10a through the axial hole 220a. The outer ring 210a transmits power to the generator through meshing with the asteroid gear. The sun gear 40a of the speed-increasing mechanism transmits power to the high-speed intermediate shaft through the spline structure 110a. The shaft body 10a of the intermediate shaft connected to the sun gear 40a has a high rotation speed, and medium-carbon alloy steel is usually used to meet the hardness requirements, and the production cost is high. Summary of the invention
[0003] The present disclosure aims to at least solve the problem of high production cost of the gearbox high-speed intermediate shaft existing in the above-mentioned prior art or related art.
[0004] To achieve the above-mentioned purpose, a first aspect embodiment of the present disclosure provides a gearbox intermediate shaft assembly, which includes a connecting piece, a gear outer ring and a spline shaft, wherein the connecting piece is configured as a gear belly plate, the gear outer ring is connected to the outer periphery of the connecting piece, the spline shaft is connected to the connecting piece, and the material hardness of the connecting piece is less than the material hardness of the gear outer ring and the material hardness of the spline shaft.
[0005] A second aspect of the present disclosure provides a gearbox, comprising: a gearbox intermediate shaft assembly as described in the above embodiment.
[0006] A third aspect of the present disclosure provides a wind turbine generator set, comprising: a gearbox as described in the above embodiment.
[0007] The gearbox intermediate shaft assembly provided by the embodiment of the present disclosure includes three parts: a connecting piece, a gear outer ring and a spline shaft, so that the gear outer ring and the spline shaft are both connected to the connecting piece, and the material hardness of the spline shaft is greater than the material hardness of the connecting piece, and the material hardness of the gear outer ring is greater than the material hardness of the connecting piece, which is conducive to the spline part and the gear part meeting the hardness requirements of power transmission. Moreover, the material hardness of the connecting piece is relatively low, eliminating the need to use the same material as the spline part for integral molding, and facilitating the use of low-cost materials to prepare the connecting piece, such as cast iron materials, thereby helping to reduce the overall production cost of the intermediate shaft assembly.
[0008] The gearbox and wind turbine generator set provided in the embodiments of the present disclosure have the gearbox intermediate shaft assembly of the above embodiments, and thus have the beneficial effects of the above embodiments, which will not be described in detail here.
[0009] Additional aspects and / or advantages of the present general inventive concept will be set forth in part in the following description and in part will be obvious from the description, or may be learned through practice of the present general inventive concept. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The above and other objects and features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings which exemplarily illustrate an example, in which:
[0011] Figure 1 is a cross-sectional schematic diagram of a gearbox intermediate shaft assembly of the related art;
[0012] Figure 2 is a schematic cross-sectional view of a gearbox intermediate shaft assembly according to an embodiment of the present invention;
[0013] Figure 3 is another schematic cross-sectional view of a gearbox intermediate shaft assembly according to an embodiment of the present invention.
[0014] Figure 1 Description of reference numerals:
[0015] 10a shaft body, 110a spline structure, 20a solid large gear, 210a outer ring, 220a shaft hole, 40a sun gear, 70a first bearing, 80a second bearing.
[0016] Figure 2 and Figure 3 Description of reference numerals:
[0017] 10 connecting piece, 110 web main body, 111 through hole, 112 limiting sink, 113 annular mounting groove, 114 weight reduction groove, 115 weight reduction hole, 120 supporting part,
[0018] 20 gear outer ring, 210 gear ring portion, 220 annular mounting portion,
[0019] 30 spline shaft,
[0020] 40 sun gear, 410 annular protrusion, 420 annular limiting groove,
[0021] 50 annular pressure plate, 510 third flange structure,
[0022] 60 bushing, 610 first flange structure, 620 second flange structure,
[0023] 70 first bearing,
[0024] 80 second bearing. DETAILED DESCRIPTION
[0025] The following specific embodiments are provided to help the reader gain a comprehensive understanding of the methods, devices and / or systems described herein. However, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be clear after understanding the disclosure of the present application. For example, the order of operations described herein is only an example and is not limited to those orders set forth herein, but can be changed as will be clear after understanding the disclosure of the present disclosure, except for operations that must occur in a specific order. In addition, for greater clarity and simplicity, descriptions of features known in the art may be omitted.
[0026] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways to implement the methods, devices, and / or systems described herein, which will be clear after understanding the disclosure of the present disclosure.
[0027] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more.
[0028] Although terms such as "first", "second", and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions should not be limited by these terms. Instead, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer, or first portion referred to in the examples may also be referred to as the second member, second component, second region, second layer, or second portion.
[0029] In the specification, when an element such as a layer, a region or a substrate is described as being “on”, “connected to” or “coupled to” another element, the element may be directly “on”, “connected to” or “coupled to” another element, or one or more other elements may be present therebetween. Conversely, when an element is described as being “directly on”, “directly connected to” or “directly coupled to” another element, other elements may not be present therebetween.
[0030] The terms used herein are only used to describe various examples and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "comprise", "include" and "have" indicate the presence of the described features, quantities, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof. The term "plurality" represents any number of two and more than two.
[0031] The definitions of directional terms such as "upper", "lower", "top" and "bottom" in the present disclosure are all based on the definitions of the orientations of the components in the drawings.
[0032] Unless otherwise defined, all terms used herein, including technical terms and scientific terms, have the same meaning as those generally understood by ordinary technicians in the field to which the present invention belongs after understanding the present invention. Unless explicitly defined as such herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant field and the present invention, and should not be interpreted in an idealized or overly formal way.
[0033] Furthermore, in the description of the examples, when it is considered that a detailed description of a well-known related construction or function will cause vague interpretation of the present invention, such a detailed description will be omitted.
[0034] The following will be combined Figure 2 and Figure 3 The gearbox intermediate shaft assembly provided in the embodiment of the present disclosure is introduced. The gearbox intermediate shaft assembly can be used in a wind turbine generator set, for example, as a component in the wind turbine generator set for transmitting the torque after the speed increase, the rotation of the blades is accelerated by the speed increase mechanism, and then transmitted to the generator through the gearbox intermediate shaft assembly to generate electricity. Of course, the gearbox intermediate shaft assembly can also be used in other places of the wind turbine generator set, or applied to other equipment, which are not listed here one by one.
[0035] like Figure 2 and Figure 3 As shown, the first aspect of the present disclosure provides a gearbox intermediate shaft assembly, which includes a connecting member 10, a gear outer ring 20 and a spline shaft 30. The gear outer ring 20 is connected to the outer periphery of the connecting member 10, the spline shaft 30 is connected to the connecting member 10, and the material hardness of the connecting member 10 is less than the material hardness of the gear outer ring 20 and the material hardness of the spline shaft 30.
[0036] The gearbox intermediate shaft assembly provided in the embodiment of the present disclosure includes three parts: a connecting member 10, a gear outer ring 20 and a spline shaft 30. The gear outer ring 20 and the spline shaft 30 are both connected to the connecting member 10, and the material hardness of the spline shaft 30 is greater than the material hardness of the connecting member 10, and the material hardness of the gear outer ring 20 is greater than the material hardness of the connecting member 10, which is conducive to the spline part and the gear part meeting the hardness requirements of power transmission. Moreover, the material hardness of the connecting member 10 is relatively low, eliminating the need to use the same material as the spline part for integral molding, and facilitating the use of low-cost materials to prepare the connecting member 10, such as cast iron materials, thereby helping to reduce the overall production cost of the intermediate shaft assembly.
[0037] Furthermore, the gear outer ring 20 and the spline shaft 30 can be detachably connected to the connector 10. The gear outer ring 20, the spline shaft 30 and the connector 10 are split structures and are assembled together later. It is convenient to select materials with appropriate hardness for the three, and no material with higher hardness is used as a whole. Since the material with lower hardness usually has lower material cost and processing cost, it is convenient for users to select materials with lower material cost to prepare the connector 10, thereby reducing production costs.
[0038] As an example, the connecting member 10 is a cast iron part. The material cost is low and the weight is light. Moreover, the connecting member 10 is cast and is easy to process. The spline shaft 30 is a medium carbon alloy steel part, and the gear outer ring 20 is a low carbon alloy steel part, which can meet the strength requirements for power transmission.
[0039] Furthermore, if Figure 2 and Figure 3 As shown, the connecting member 10 is constructed in the shape of a gear web. The mating gear part is the outer ring of the gear ring. The outer ring 20 of the gear is directly arranged on the outer periphery of the connecting member 10, which is different from the related art in which a solid large gear 20a with an axial hole is directly sleeved on the shaft body 10a (refer to Figure 1 ), reducing the material cost of the gear part with higher material cost, further reducing production cost.
[0040] To reduce production costs, further, in some embodiments, such as Figure 2 and Figure 3 As shown, the length of the connecting member 10 in its own axial direction is less than the length of the gear outer ring 20 in its own axial direction. Here, it is assumed that the axial direction of the connecting member 10 is in the same direction as the axial direction of the gear outer ring 20. The connecting member 10 is thinner, uses less material, reduces cost, and reduces weight.
[0041] In some embodiments, the connecting member 10 does not protrude outwardly from the two sides of the gear outer ring 20 in its own axial direction. The connecting member 10 is thinner, uses less material, reduces costs, occupies less space, and reduces weight.
[0042] In some embodiments, Figure 2and Figure 3 As shown, at least one of the two axial side surfaces of the connecting member 10 is provided with a weight-reducing groove 114; and / or the connecting member 10 is provided with an axially penetrating weight-reducing hole 115. This reduces the material usage, saves costs, and is lightweight.
[0043] Regarding the positional relationship between the spline shaft 30 and the connecting member 10, further, in some embodiments, as Figure 2 and Figure 3 As shown, the spline shaft 30 is arranged on an axial side surface of the connecting member 10. Compared with the spline shaft 30 being arranged on the inner side of the central through hole 111 of the connecting member 10, the installation space is large, and the two are conveniently connected together. Moreover, the inner diameter of the spline shaft 30 is not too small, which is conducive to connecting with a larger size sun gear 40, thereby facilitating the transmission of large torque and high structural strength.
[0044] As an example, Figure 2 and Figure 3 As shown, the connector 10 includes a web body portion 110 and a support portion 120 which are arranged successively in the axial direction, the web body portion 110 has a through hole 111 at its center, and the support portion 120 is located on one side of the web body portion 110 and is arranged close to the through hole 111. The spline shaft 30 is arranged on an axial side surface of the web body portion 110 away from the support portion 120.
[0045] Here, only one side of the web main body 110 is provided with the support portion 120 , which reduces the use of materials and saves costs. In addition, sufficient space can be reserved for the installation of the spline shaft 30 on the other side, thereby facilitating the assembly of the spline shaft 30 .
[0046] Furthermore, the support portion 120 is configured to cooperate with the bearing supporting the intermediate shaft assembly of the gear box. Furthermore, the outer peripheral surface of the spline shaft 30 can also be configured to cooperate with the bearing supporting the intermediate shaft assembly of the gear box. Then the bearing can axially support the intermediate shaft assembly on both sides of the web body portion 110, and the support is stable. Moreover, referring to Figure 1 Compared with the related art in which both ends of the shaft body 10a protrude from the solid large gear 20a, and the first bearing 70a and the second bearing 80a for support are respectively sleeved on the two ends of the protrusion, the connecting member 10 has a small volume, uses less material, and reduces costs.
[0047] As an example, Figure 2 and Figure 3As shown, an axial side surface of the connector 10 is provided with an annularly distributed limiting sink 112, which extends in the radial direction to the through hole 111 at the center of the connector 10, and a portion of the spline shaft 30 is embedded in the limiting sink 112. The outer peripheral surface of the spline shaft 30 is limitedly matched with the limiting sink 112. On the one hand, it is convenient for the spline shaft 30 to be quickly installed in place by aligning the position of the limiting sink 112, and on the other hand, the design of the limiting sink 112 reduces the material used in the connector 10, saves cost, and reduces weight.
[0048] Regarding the connection method between the spline shaft 30 and the connecting member 10, further, in some embodiments, the spline shaft 30 and the connecting member 10 are connected together by screws or pins.
[0049] In a specific application, when a portion of the spline shaft 30 is embedded in the limiting sink 112 , a screw or bolt is inserted into the spline shaft 30 through the limiting sink 112 from the side where the support portion 120 is located. Figure 3 The first mounting hole for the screw to pass through is shown. The connection is firm and can ensure that the two rotate synchronously. The number of screws or pins is multiple and evenly distributed on the circumference of the spline shaft 30.
[0050] Regarding the positional relationship between the gear outer ring 20 and the connecting member 10, further, in some embodiments, as Figure 2 and Figure 3 As shown, the outer circumferential surface of the connecting member 10 is provided with an annular mounting groove 113, and the gear outer ring 20 includes a gear ring portion 210 and an annular mounting portion 220 located inside the gear ring portion 210, and the annular mounting portion 220 is inserted into the annular mounting groove 113. On the one hand, it is convenient for the gear outer ring 20 to be quickly installed in place by aligning the position of the annular mounting groove 113, and on the other hand, the design of the annular mounting groove 113 reduces the material used for the connecting member 10, saves cost, and reduces weight.
[0051] Furthermore, the annular mounting portion 220 and the annular mounting groove 113 are interference-fitted together, which is conducive to the two being firmly connected and rotating synchronously.
[0052] Of course, in other embodiments, the outer peripheral surface of the connecting member 10 may not have the annular mounting groove 113, and the gear outer ring 20 includes a gear ring portion 210 and an annular mounting portion 220 located on the inner side of the gear ring portion 210, and the annular mounting portion 220 is directly stacked on an axial side of the connecting member 10 near the edge.
[0053] Regarding the connection between the gear outer ring 20 and the connecting member 10, further, in some embodiments, the connecting member 10 and the annular mounting portion 220 are connected together by screws or pins. The connection is firm, which is conducive to ensuring that the connecting member 10 drives the gear outer ring 20 to rotate synchronously.
[0054] In a specific application, the screw or bolt passes through the overlapping portion of the annular mounting portion 220 and the connector 10 from the side where the support portion 120 is located. There are multiple screws or pins, which are evenly distributed in the circumferential direction of the annular mounting portion 220. Figure 3 A second mounting hole is shown for the screw to pass through there.
[0055] The second aspect of the present disclosure provides a gearbox, including: a gearbox intermediate shaft assembly as in any of the above embodiments. The gearbox provided in the embodiment of the present disclosure has the gearbox intermediate shaft assembly of any of the above embodiments, and thus has the beneficial effects of any of the above embodiments, which will not be described one by one here.
[0056] In some embodiments, Figure 2 and Figure 3 As shown, the gearbox further includes a first bearing 70 and a second bearing 80, the first bearing 70 is sleeved on the outer periphery of the spline shaft 30, and the second bearing 80 is sleeved on the outer periphery of the support portion 120 of the connecting member 10, and the first bearing 70 and the second bearing 80 are used to circumferentially support the spline shaft 30 and the connecting member 10. The first bearing 70 and the second bearing 80 are used to axially support the intermediate shaft assembly on both sides of the web main body 110, and the support is stable.
[0057] In some embodiments, Figure 2 and Figure 3 As shown, the gearbox further includes: a sun gear 40 , one end of which extends into the inner hole of the spline shaft 30 and meshes with the spline structure of the side wall of the inner hole of the spline shaft 30 .
[0058] In a specific application, the gearbox further includes a speed increasing mechanism (not shown in the figure), which has a multi-stage planetary gear for multi-stage speed increasing, and the sun gear 40 here is the sun gear 40 in the last stage of the planetary gear. After the fan blades rotate and are accelerated by the speed increasing mechanism, they are transmitted to the generator (not shown in the figure) through the intermediate shaft assembly and the pinion gear (not shown in the figure) to generate electricity.
[0059] In some embodiments, Figure 2 and Figure 3As shown, the gearbox also includes: an annular pressure plate 50 and a bushing 60. An annular protrusion 410 is provided on the end surface of the sun gear 40 close to the spline shaft 30, and the annular pressure plate 50 is arranged on the annular protrusion 410, and an annular limiting groove 420 with an opening facing outward is formed between the annular protrusion 410. The bushing 60 is inserted into the through hole 111 in the center of the connecting member 10, and the end of the bushing 60 close to the spline shaft 30 has a first flange structure 610 turned inward, and the first flange structure 610 is limited in the annular limiting groove 420. Then, whether the sun gear 40 wants to move inside the connecting member 10 or wants to move in a direction away from the indirect member, it can be blocked by the first flange structure 610, which can effectively prevent the sun gear 40 from moving in the axial direction, improve the transmission stability, reduce the chance of wear, and reduce the operating noise.
[0060] Furthermore, if Figure 2 As shown, the end of the bushing 60 away from the spline shaft 30 has a second flange structure 620 turned outward, and the second flange structure 620 is limitedly matched with the side of the connecting member 10 away from the spline shaft 30. This can effectively prevent the bushing 60 from axially transmitting inside the connecting member 10.
[0061] Furthermore, if Figure 3 As shown, the inner edge of the annular pressure plate 50 has a third flange structure 510 that is turned toward the direction of the sun gear 40, and the third flange structure 510 is matched with the inner circumference of the sun gear 40 in the radial upper limit position. It can effectively limit the radial vibration of the sun gear 40, improve the transmission stability, reduce the probability of wear, and reduce the operating noise.
[0062] Furthermore, the annular pressure plate 50 is connected to the annular protrusion 410 on the sun gear 40 by screws. Figure 3 The third mounting hole for the screw to pass through is shown. The second flange structure 620 of the bushing 60 is connected to the connecting member 10 by screws. Figure 3 A fourth mounting hole for inserting a screw therein is shown. The connection is firm, and the axial movement of the sun gear 40 relative to the connecting member 10 can be effectively avoided.
[0063] The third aspect of the present disclosure provides a wind turbine generator set, including: a gearbox as in any one of the above embodiments. The wind turbine generator set provided by the embodiment of the present disclosure has the gearbox of any one of the above embodiments, and thus has the beneficial effects of any one of the above embodiments, which will not be described one by one here.
[0064] Although the embodiments of the present application have been described in detail above, those skilled in the art may make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the present invention. It should be understood that, in the view of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present application defined by the claims.
Claims
1. A gearbox intermediate shaft assembly, characterized in that: The gearbox intermediate shaft assembly comprises a connecting member (10), a gear outer ring (20) and a spline shaft (30); the connecting member (10) is configured in the shape of a gear web; the gear outer ring (20) is connected to the outer periphery of the connecting member (10); the spline shaft (30) is connected to the connecting member (10); and the material hardness of the connecting member (10) is less than the material hardness of the gear outer ring (20) and the material hardness of the spline shaft (30).
2. The gearbox intermediate shaft assembly according to claim 1, characterized in that: The connecting member (10) is a cast iron part, the spline shaft (30) is a medium carbon alloy steel part, and the gear outer ring (20) is a low carbon alloy steel part; and / or The gear outer ring (20) and the spline shaft (30) can both be detachably connected to the connecting member (10).
3. The gearbox intermediate shaft assembly according to claim 1, characterized in that: The length of the connecting member (10) in its own axial direction is less than or equal to the length of the gear outer ring (20) in its own axial direction.
4. The gearbox intermediate shaft assembly according to any one of claims 1 to 3, characterized in that: The spline shaft (30) is arranged on an axial side surface of the connecting member (10).
5. The gearbox intermediate shaft assembly according to claim 4, characterized in that: The connecting member (10) comprises a web main body (110) and a support part (120) which are arranged successively in the axial direction, the web main body (110) has a through hole (111) at its center, the support part (120) is located on one side of the web main body (110) and is arranged close to the through hole (111), and the support part (120) is configured to cooperate with a bearing supporting the gearbox intermediate shaft assembly; The spline shaft (30) is arranged on an axial side surface of the web main body portion (110) facing away from the support portion (120).
6. The gearbox intermediate shaft assembly according to claim 4, characterized in that: An axial side surface of the connecting piece (10) is provided with an annularly distributed limiting sink platform (112), and the limiting sink platform (112) extends in a radial direction to a through hole (111) at the center of the connecting piece (10); A portion of the spline shaft (30) is embedded in the position-limiting sink (112), and the outer peripheral surface of the spline shaft (30) is position-limitingly matched with the position-limiting sink (112).
7. The gearbox intermediate shaft assembly according to claim 4, characterized in that: The spline shaft (30) and the connecting member (10) are connected together by means of screws or pins.
8. The gearbox intermediate shaft assembly according to claim 1, characterized in that: The outer peripheral surface of the connecting member (10) is provided with an annular mounting groove (113); the gear outer ring (20) comprises a gear ring portion (210) and an annular mounting portion (220) located inside the gear ring portion (210); the annular mounting portion (220) is inserted into the annular mounting groove (113).
9. The gearbox intermediate shaft assembly according to claim 8, characterized in that: The connecting member (10) and the annular mounting portion (220) are connected together by screws or pins; and / or The annular mounting portion (220) and the annular mounting groove (113) are interference fitted together.
10. The gearbox intermediate shaft assembly according to claim 1, characterized in that: A weight-reducing groove (114) is provided on at least one of the two axial side surfaces of the connecting member (10); and / or The connecting piece (10) is provided with a weight-reducing hole (115) which penetrates axially.
11. A gear box, characterized in that: include: A gearbox intermediate shaft assembly as claimed in any one of claims 1 to 10.
12. The gearbox according to claim 11, characterized in that The invention also comprises a first bearing (70) and a second bearing (80), wherein the first bearing (70) is sleeved on the outer periphery of the spline shaft (30), and the second bearing (80) is sleeved on the outer periphery of the support portion (120) of the connecting member (10), and the first bearing (70) and the second bearing (80) are used to circumferentially support the spline shaft (30) and the connecting member (10).
13. The gearbox according to claim 12, characterized in that The gearbox also includes: A sun gear (40), one end of which extends into the inner hole of the spline shaft (30) and meshes with the spline structure of the side wall of the inner hole of the spline shaft (30); an annular pressure plate (50), an annular protrusion (410) being arranged on the end surface of the sun gear (40) close to the spline shaft (30), the annular pressure plate (50) being arranged on the annular protrusion (410), and forming an annular limiting groove (420) opening outwards between the annular pressure plate (50) and the annular protrusion (410); A bushing (60), wherein the bushing (60) is inserted into the through hole (111) at the center of the connecting member (10), wherein the end of the bushing (60) close to the spline shaft (30) has a first flange structure (610) turned inward, wherein the first flange structure (610) is limited in the annular limiting groove (420), and the end of the bushing (60) away from the spline shaft (30) has a second flange structure (620) turned outward, wherein the second flange structure (620) is limitedly matched with the side of the connecting member (10) away from the spline shaft (30).
14. The gearbox according to claim 13, characterized in that The inner edge of the annular pressure plate (50) has a third flange structure (510) that is turned in the direction of the sun gear (40), and the third flange structure (510) is matched with the inner peripheral surface of the sun gear (40) in a radial upper limit position.
15. A wind turbine generator set, characterized in that: include: A gearbox as claimed in any one of claims 11 to 14.