Wind generating set transmission system and wind generating set

Abstract

The utility model provides a wind generating set transmission system and a wind generating set, the wind generating set transmission system comprises: a main shaft system comprising a bearing seat and a main shaft, the main shaft is rotatably arranged in the bearing seat; the gear box comprises a box body, a low-speed shaft and a sliding bearing, the low-speed shaft and the sliding bearing are arranged in the box body, and the low-speed shaft is supported in the box body through the sliding bearing; and the low-speed shaft is connected with the main shaft through the flexible coupler. According to the transmission system, the manufacturing cost of the gear box can be reduced under the condition that the reliability of the gear box is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, and more specifically, to a wind turbine generator transmission system and a wind turbine generator set. Background Art

[0002] A wind turbine generator set includes an impeller, a transmission system, and a generator. After receiving wind energy, the impeller transfers kinetic energy to the generator through the transmission system, and the wind energy is converted into electrical energy through the motor. The transmission system includes a main shaft system and a gearbox, which are key components for transmitting the impeller speed and load to the wind generator. Specifically, the main shaft system includes a main shaft and a bearing seat that supports the main shaft for rotation. The front end of the main shaft is connected to the impeller, and the rear end of the main shaft is connected to the gearbox. The gearbox increases the speed and transmits it to the generator. Wind speed is usually unstable. The gearbox can adjust the very low impeller speed to a speed suitable for generator power generation. At the same time, it also makes the generator easy to control and achieves stable frequency and voltage output.

[0003] Rolling bearings are commonly used in transmission systems to provide rotational support for rotating shafts. However, because the rotating shafts in transmission systems are typically large, the rolling bearings must also be sized accordingly, resulting in high manufacturing costs. In the prior art, to reduce manufacturing costs, the main shaft and the input shaft of the gearbox are typically fixedly connected, eliminating the need for rolling bearings in the gearbox. However, in this case, the deflection, position, and vibration of the main shaft connected to the impeller are transmitted to the gearbox via the input shaft, increasing the load on the gearbox and requiring a corresponding increase in the gearbox's design strength, which in turn increases the weight and cost of the gearbox. Utility Model Content

[0004] The purpose of the utility model is to provide a wind turbine generator transmission system and a wind turbine generator set, so as to effectively reduce the total cost of the transmission system while ensuring the reliability of the transmission system.

[0005] According to an embodiment of the present application, a wind turbine transmission system is provided, comprising: a main shaft system, including a bearing seat and a main shaft, the main shaft being rotatably arranged in the bearing seat; a gear box, the gear box comprising a housing, a low-speed shaft arranged in the housing, and a sliding bearing, the low-speed shaft being supported in the housing by the sliding bearing; and a flexible coupling, the low-speed shaft being connected to the main shaft via the flexible coupling.

[0006] According to one aspect of the present application, the sliding bearing includes a first sliding bearing and a second sliding bearing, which respectively support the low-speed shaft at both axial ends of the low-speed shaft.

[0007] According to one aspect of the present application, the sliding bearing includes a plurality of bearing segments, and the plurality of bearing segments are spaced apart and distributed around the outer circumference of the low-speed shaft.

[0008] According to one aspect of the present application, the sliding bearing includes at least two bearing segments, which are symmetrically arranged at the lower part of the low speed shaft in the circumferential direction of the low speed shaft and in the direction of gravity to support the low speed shaft.

[0009] According to one aspect of the present application, each bearing segment includes a bearing shell and a bearing shell connecting seat, wherein the bearing shell connecting seat is mounted on the inner side of the housing, the bearing shell is movably mounted on the bearing shell connecting seat, and the bearing shell is a tilting shell.

[0010] According to one aspect of the present application, the gearbox includes a first planetary gear train located in the housing, the first planetary gear train includes a first planet carrier, and the first planet carrier constitutes the low-speed shaft of the gearbox.

[0011] According to one aspect of the present application, the first planetary gear system also includes a plurality of first planetary gears, the first planetary carrier includes a planetary gear mounting portion, an input shaft and an extension shaft respectively located on both axial sides of the planetary gear mounting portion, and the plurality of first planetary gears are rotatably mounted on the planetary gear mounting portion, the input shaft is arranged on the side of the planetary gear mounting portion facing the main shaft system, and is connected to the main shaft through the flexible coupling, the extension shaft is arranged on the other side of the planetary gear mounting portion opposite to the main shaft system, the first sliding bearing is arranged between the input shaft and the housing, and the second sliding bearing is arranged between the extension shaft and the housing.

[0012] According to one aspect of the present application, the housing includes a first ring gear, a first bearing mounting portion and a second bearing mounting portion, the first ring gear is located radially outside the planetary gear mounting portion and meshes with the first planetary gear, the first bearing mounting portion is located on the side of the first ring gear facing the main shaft system, and is coaxially sleeved with the input shaft, the first sliding bearing is installed between the first bearing mounting portion and the input shaft, the second bearing mounting portion is located on the side of the first ring gear away from the main shaft system, and is coaxially sleeved with the extension shaft, and the second sliding bearing is installed between the second bearing mounting portion and the extension shaft.

[0013] According to one aspect of the present application, the housing further includes a first web and a second web, the first web and the second web respectively extending radially inward from both axial ends of the first gear ring, the first bearing mounting portion extending axially from the radial inner end of the first web and located on the outer periphery of the input shaft, the second bearing mounting portion extending axially from the radial inner end of the second web and coaxially sleeved with the extension shaft, the first sliding bearing being mounted on the first bearing mounting portion, and the second sliding bearing being mounted on the second bearing mounting portion.

[0014] According to one aspect of the present application, the extension shaft extends from the planetary gear mounting portion toward a side away from the main shaft, the second bearing mounting portion is sleeved on the outer circumference of the extension shaft, and the second sliding bearing is located between the radial outer side of the extension shaft and the radial inner side of the second bearing mounting portion, or the extension shaft is a hollow shaft located on a side of the planetary gear mounting portion away from the main shaft, the second bearing mounting portion is inserted into the interior of the extension shaft, and the second sliding bearing is located between the radial outer side of the second bearing mounting portion and the radial inner side of the extension shaft.

[0015] According to another aspect of the present application, a wind turbine generator set is provided, comprising an impeller, a generator, and the wind turbine generator set transmission system as described above, wherein the wind turbine generator set transmission system is connected between the impeller and the generator.

[0016] According to the transmission system of the wind turbine generator set of the present application, on the one hand, the low-speed shaft of the gearbox is connected to the main shaft of the main shaft system through a flexible coupling, which can avoid the main shaft deflection and displacement, vibration load, etc. in the main shaft system from being transmitted to the gearbox, reducing the load on the gearbox, thereby reducing the strength requirements for the gearbox, and significantly reducing the manufacturing cost of the gearbox. On the other hand, by providing a sliding bearing in the gearbox to support the low-speed shaft of the gearbox, the manufacturing cost of the bearing can be greatly reduced compared to the support method using rolling bearings. Combining the structural features of the above-mentioned flexible coupling and sliding bearing, the manufacturing cost of the transmission system of the wind turbine generator set can be greatly reduced, and since the vibration and displacement of the main shaft system are not introduced into the gearbox, the reliability of the gearbox can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects and features of the present invention will become more apparent with reference to the following drawings, in which:

[0018] Figure 1 It is a structural schematic diagram of a transmission system according to an embodiment of the present utility model;

[0019] Figure 2 is a partial enlarged view of a gearbox according to an embodiment of the present utility model;

[0020] Figure 3 It is a schematic diagram of the structure of the sliding bearing and input shaft arranged in the gearbox. DETAILED DESCRIPTION

[0021] The following detailed description is 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 merely 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 application, except for operations that must occur in a specific order. In addition, for greater clarity and conciseness, descriptions of features known in the art may be omitted.

[0022] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided to illustrate only some of the many possible ways to implement the methods, devices, and / or systems described herein, which will become clear after understanding the disclosure of this application.

[0023] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more.

[0024] 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 used solely to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, what is referred to as a first member, first component, first region, first layer, or first portion in the examples described herein may also be referred to as a second member, second component, second region, second layer, or second portion without departing from the teachings of the examples.

[0025] In the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “mounted to” another element, the element may be directly “on,” “connected to,” or “mounted to” the other 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 mounted to” another element, no other elements may be present therebetween.

[0026] 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 "comprising," "including," and "having" indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude 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.

[0027] The definitions of directional terms such as "upper", "lower", "top", "bottom", "height direction", etc. in this application are all based on the orientation of the product when it is in normal use and placed upright.

[0028] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art after understanding the present invention. Unless expressly defined otherwise 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 art and the present invention, and should not be interpreted in an idealized or overly formal manner.

[0029] Furthermore, in the description of examples, when it is deemed that a detailed description of well-known related components or functions will cause an ambiguous interpretation of the present invention, such detailed description will be omitted.

[0030] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0031] Figure 1 FIG. 1 shows a schematic structural diagram of a transmission system according to an embodiment of the present utility model. Figure 1 As shown, the transmission system includes a main shaft 100 and a gearbox 200. The front end of the main shaft 100 is connected to the impeller 50, the rear end of the main shaft 100 is connected to the front end of the gearbox 200, and the rear end of the gearbox 200 is connected to a generator (not shown). Through this transmission system, wind energy captured by the impeller 50 is accelerated to a suitable speed by the gearbox 200 and then transmitted to the generator, thereby converting the wind energy into electrical energy.

[0032] The main shaft system 100 includes a bearing housing 110, a main shaft 120, and a main bearing 130. The main shaft 120 is rotatably mounted in the bearing housing 110 via the main bearing 130. The gearbox 200 includes a housing 210, within which are located a low-speed shaft and a high-speed shaft. The low-speed shaft serves as the input of the gearbox 200 and is connected to the main shaft 120. The high-speed shaft serves as the output of the gearbox 200 and is connected to the generator.

[0033] According to the transmission system of the embodiment of the present application, it further includes a flexible coupling 300 and a sliding bearing 240 . The low-speed shaft is connected to the output end of the main shaft 120 through the flexible coupling 300 , and the low-speed shaft is rotatably supported in the box 210 through the sliding bearing 240 .

[0034] The flexible coupling 300, which can be a claw coupling, elastic column coupling, or spring coupling, securely connects the driving and driven shafts for joint rotation and transmits the driving shaft's rotational power and torque to the driven shaft. Compared to a rigid connection between two shafts, the coupling can compensate for angular deviation and axial misalignment, cushion load impact, and absorb vibration, thereby improving system stability.

[0035] According to an embodiment of the present application, the main shaft 120 of the main shaft system 100 and the low-speed shaft of the gear box 200 are connected by a flexible coupling 300, which can avoid the main shaft deflection and displacement, vibration load, etc. in the main shaft system 100 from being transmitted to the gear box 200. On the one hand, the load on the gear box 200 is reduced, and the strength requirements for the gear box 200 are reduced, so the weight and manufacturing cost of the gear box can be greatly reduced. On the other hand, since the vibration and displacement of the main shaft system 100 are not introduced into the gear box 200, the reliability of the gear box 200 is increased.

[0036] According to an embodiment of the present application, the low-speed shaft is supported in the housing 210 by a sliding bearing 240. Two sliding bearings 240 can be provided, including a first sliding bearing 241 and a second sliding bearing 242, which support the low-speed shaft at both axial ends, respectively, so that the support for the low-speed shaft is more stable and the load distribution is more uniform.

[0037] The sliding bearing 240 includes a plurality of bearing segments, which are spaced apart around the periphery of the low-speed shaft. The plurality of bearing segments can be spaced apart around the entire periphery of the low-speed shaft or can be arranged only below the low-speed shaft. Figure 3 As shown, sliding bearing 240 can be composed of at least two bearing segments, symmetrically arranged about the circumference of the low-speed shaft and in the direction of gravity, at the lower portion of the low-speed shaft to support the low-speed shaft. By positioning sliding bearing 240 below the low-speed shaft, or positioning some of the multiple bearing segments of sliding bearing 240 below the low-speed shaft, the low-speed shaft can be supported against gravity and loads in the direction of gravity, thereby ensuring operational stability of the low-speed shaft.

[0038] As an example, each bearing segment includes a bearing and a bearing connector, which is installed on the inner side of the housing 210 or on the outer periphery of the low-speed shaft. The bearing is movably mounted on the bearing connector, so that the bearing is formed into a tilting pad to have higher reliability and operational stability.

[0039] According to the embodiments of the present application, on the one hand, because the low-speed shaft is connected to the main shaft 120 via the flexible coupling 300, the load on the low-speed shaft is relatively small. Sliding bearing 240 only needs to bear the gravity load of the low-speed shaft itself, which reduces the size and manufacturing cost of sliding bearing 240. On the other hand, compared to the full-circle structure of rolling bearings, sliding bearing 240 can be segmented. As a result, the size of each bearing segment is relatively small, making it easier to manufacture, transport, install, replace, and repair, significantly reducing manufacturing and maintenance costs.

[0040] Next, combine Figures 1 to 3 The specific structure of the gearbox 200 is described in more detail.

[0041] like Figure 1 and Figure 2 As shown, the gearbox 200 includes a housing 210 and a planetary gear train disposed in the housing 210. A low-speed shaft and a high-speed shaft are disposed at both ends of the gearbox 200. The low-speed shaft is connected to the main shaft 120, and the high-speed shaft is connected to the rotor of the generator.

[0042] The gearbox 200 can be a single-stage speed-increasing gearbox or a multi-stage speed-increasing gearbox, for example, a two-stage speed-increasing gearbox or a three-stage speed-increasing gearbox. Accordingly, the planetary gear train can be a single-stage planetary gear train, a two-stage planetary gear train, or a three-stage planetary gear train. The embodiments of the present invention do not impose any specific restrictions on the number of stages of the gearbox 200. However, it can be determined that the gearbox 200 includes at least a single-stage planetary gear train. In the case where the planetary gear train is a single-stage planetary gear train, the planetary carrier of the first-stage planetary gear train constitutes the low-speed shaft of the gearbox and is connected to the main shaft 120, and the sun gear of the first-stage planetary gear train constitutes the high-speed shaft of the gearbox and is connected to the rotor of the generator. In the case where the planetary gear train is a multi-stage gear train, the planetary carrier of the first-stage planetary gear train constitutes the low-speed shaft of the gearbox and is connected to the main shaft 120, and the sun gear of the last-stage planetary gear train constitutes the high-speed shaft of the gearbox and is connected to the rotor of the generator. This application mainly focuses on the structure of the low-speed shaft side. In order to avoid unnecessary ambiguity, this application omits detailed descriptions of other structures in the gearbox, for example, omits the relevant descriptions of the second-stage planetary gear system, the third-stage planetary gear system and the high-speed shaft.

[0043] like Figure 2As shown, according to an embodiment of the present invention, the planetary gear train in the gearbox 200 includes a first planetary gear train, which includes a first planetary carrier 220, a plurality of first planetary gears 230 disposed on the first planetary carrier 220, and a first sun gear (not shown) disposed inside the plurality of first planetary gears 230. The housing 210 includes a first ring gear 211, and the plurality of first planetary gears 230 mesh with both the first ring gear 211 and the first sun gear, increasing the speed input from the main shaft 120 and transmitting it downward through the sun gear.

[0044] According to an embodiment of the present invention, the first planet carrier 220 serves as the low-speed shaft of the gearbox 200 , and the side facing the main shaft system 100 is connected to the output end of the main shaft 120 through a flexible coupling 300 .

[0045] Specifically, the first planetary carrier 220 includes a planetary gear mounting portion 221, an input shaft 222 and an extension shaft 223 respectively located on both axial sides of the planetary gear mounting portion 221, and multiple first planetary gears 230 are movably mounted on the planetary gear mounting portion 221. The input shaft 222 is arranged on the side of the planetary gear mounting portion 221 facing the main shaft system 100, and is connected to the main shaft 120 through the flexible coupling 300. The extension shaft 223 is arranged on the other side of the planetary gear mounting portion 221 opposite to the main shaft system 100, and two sliding bearings 240 are respectively installed in alignment with the input shaft 222 and the extension shaft 223.

[0046] The housing 210 includes a first ring gear 211, a first bearing mounting portion 214, and a second bearing mounting portion 215. The first ring gear 211 is located radially outwardly of the planetary gear mounting portion 221 and meshes with the first planetary gears 230. The first bearing mounting portion 214 is located on the side of the first ring gear 211 facing the main shaft system 100 and is coaxially mounted with the input shaft 222. A first sliding bearing 241 is mounted between the first bearing mounting portion 214 and the input shaft 222. The second bearing mounting portion 215 is located on the side of the first ring gear 211 facing the generator and is coaxially mounted with the extension shaft 223. A second sliding bearing 242 is mounted between the second bearing mounting portion 215 and the extension shaft 223.

[0047] As an example, the first bearing mounting portion 214 and the second bearing mounting portion 215 can have a smaller inner diameter than the first ring gear 211 to reduce the overall size of the sliding bearings. Specifically, the housing 210 further includes a first web 212 and a second web 213, each extending radially inward from the axial ends of the first ring gear 211. The first bearing mounting portion 214 extends axially from the radially inner end of the first web 212 and is located on the outer periphery of the input shaft 222. The second bearing mounting portion 215 extends axially from the radially inner end of the second web 213 and is coaxially sleeved with the extension shaft 223. The first sliding bearing 241 is mounted on the first bearing mounting portion 214, and the second sliding bearing 242 is mounted on the second bearing mounting portion 215. As a result, the low-speed shaft of the gearbox 200 can be supported at both ends by the first sliding bearing 241 and the second sliding bearing 242, respectively.

[0048] By providing sliding bearings at both ends of the first planetary carrier (low-speed shaft) 220 for support, the load borne by the low-speed shaft and the load transmitted to the housing 210 can be distributed more evenly, avoiding the first planetary carrier from tilting, which causes the total load to be transferred to a single-sided bearing.

[0049] According to an embodiment of the present application, the front end of the housing 210 also includes a connecting portion 216 extending from the first bearing mounting portion 214 toward the main shaft system 100. The connecting portion 216 is fixedly connected to the bearing seat 110 of the main shaft system 100, so that the main shaft system 100 and the gearbox 200 can be connected together, the support for the internal components is more stable, and the overall structure is more compact.

[0050] According to an embodiment of the present application, the second bearing mounting portion 215 is coaxially sleeved with the extension shaft 223. As an example, the second bearing mounting portion 215 can be sleeved radially outside the extension shaft 223. For example, the extension shaft 223 extends from the planetary gear mounting portion 221 toward a side away from the main shaft 120, and has an inner diameter greater than an outer diameter of the extension shaft 223. Thus, the second bearing mounting portion 215 is sleeved on the outer circumference of the extension shaft 223, and the second sliding bearing 242 is located between the radial outer side of the extension shaft 223 and the radial inner side of the second bearing mounting portion 215.

[0051] According to another example of the present invention, the extension shaft 223 can be formed as a hollow shaft located on the side of the planetary gear mounting portion 221 away from the main shaft 120, the second web 213 extends from the side of the extension shaft 223 facing the generator to the radial inner side of the hollow shaft, the second bearing mounting portion 215 extends axially and is inserted into the interior of the extension shaft 223, and is sleeved on the radial inner side of the extension shaft 223, and the second sliding bearing 242 is installed on the radial outer side of the second bearing mounting portion 215, so as to be located on the radial inner side of the extension shaft 223.

[0052] According to another embodiment of the present invention, a wind turbine generator set is provided, comprising an impeller, a generator, and the wind turbine generator set transmission system as described above, wherein the wind turbine generator set transmission system is connected between the impeller and the generator.

[0053] Although the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the above embodiments. Without departing from the scope of the present invention, those skilled in the art can make various deformations and modifications based on the above embodiments, which all fall within the scope of protection of the present invention.

Claims

1. A wind turbine transmission system, characterized in that: include: A main shaft system (100) comprises a bearing seat (110) and a main shaft (120), wherein the main shaft (120) is rotatably disposed in the bearing seat (110); A gearbox (200), the gearbox (200) comprising a housing (210), a low-speed shaft disposed in the housing (210), and a sliding bearing (240), wherein the low-speed shaft is supported in the housing (210) via the sliding bearing (240); A flexible coupling (300), wherein the low-speed shaft is connected to the main shaft (120) via the flexible coupling (300).

2. The wind turbine transmission system according to claim 1, characterized in that: The sliding bearing (240) comprises a first sliding bearing (241) and a second sliding bearing (242), which respectively support the low-speed shaft at both axial ends of the low-speed shaft.

3. The wind turbine generator transmission system according to claim 1, characterized in that: The sliding bearing (240) includes a plurality of bearing segments spaced apart around the periphery of the low-speed shaft.

4. The wind turbine transmission system according to claim 3, characterized in that: The sliding bearing (240) includes at least two bearing segments, and the at least two bearing segments are symmetrically arranged at a lower portion of the low-speed shaft in a circumferential direction of the low-speed shaft with respect to a gravity direction.

5. The wind turbine transmission system according to claim 3, characterized in that: Each bearing segment includes a bearing shell and a bearing shell connecting seat. The bearing shell connecting seat is installed on the inner side of the box body. The bearing shell is movably installed on the bearing shell connecting seat. The bearing shell is a tilting shell.

6. The wind turbine transmission system according to claim 2, characterized in that: The gearbox (200) comprises a first planetary gear train located in the housing (210), the first planetary gear train comprising a first planet carrier (220), the first planet carrier (220) constituting the low-speed shaft of the gearbox.

7. The wind turbine transmission system according to claim 6, characterized in that: The first planetary gear system further includes a plurality of first planetary gears (230), the first planetary carrier (220) includes a planetary gear mounting portion (221), an input shaft (222) and an extension shaft (223) respectively located on both axial sides of the planetary gear mounting portion (221), the plurality of first planetary gears (230) are rotatably mounted on the planetary gear mounting portion (221), the input shaft (222) is arranged on a side of the planetary gear mounting portion (221) facing the main shaft system (100), and is connected to the main shaft (120) through the flexible coupling (300), the extension shaft (223) is arranged on the other side of the planetary gear mounting portion (221) opposite to the main shaft system (100), the first sliding bearing (241) is arranged between the input shaft (222) and the housing (210), and the second sliding bearing (242) is arranged between the extension shaft (223) and the housing (210).

8. The wind turbine transmission system according to claim 7, characterized in that: The housing comprises a first gear ring (211), a first bearing mounting portion (214) and a second bearing mounting portion (215); the first gear ring (211) is located radially outside the planetary gear mounting portion (221) and meshes with the first planetary gear (230); the first bearing mounting portion (214) is located on the side of the first gear ring (211) facing the main shaft system (100) and is coaxially sleeved with the input shaft (222); the first sliding bearing (241) is mounted between the first bearing mounting portion (214) and the input shaft (222); the second bearing mounting portion (215) is located on the side of the first gear ring (211) facing away from the main shaft system (100) and is coaxially sleeved with the extension shaft (223); the second sliding bearing (242) is mounted between the second bearing mounting portion (215) and the extension shaft (223).

9. The wind turbine transmission system according to claim 8, characterized in that: The housing (210) further includes a first web (212) and a second web (213), wherein the first web (212) and the second web (213) respectively extend radially inward from both axial ends of the first gear ring (211), the first bearing mounting portion (214) extends axially from the radial inner end of the first web (212) and is located on the outer periphery of the input shaft (222), the second bearing mounting portion (215) extends axially from the radial inner end of the second web (213) and is coaxially sleeved with the extension shaft (223), the first sliding bearing (241) is mounted on the first bearing mounting portion (214), and the second sliding bearing (242) is mounted on the second bearing mounting portion (215).

10. The wind turbine transmission system according to claim 8, characterized in that: The extension shaft (223) extends from the planetary gear mounting portion (221) toward a side away from the main shaft (120), the second bearing mounting portion (215) is sleeved on the outer periphery of the extension shaft (223), and the second sliding bearing (242) is located between the radial outer side of the extension shaft (223) and the radial inner side of the second bearing mounting portion (215), or, The extension shaft (223) is a hollow shaft located on a side of the planetary gear mounting portion (221) away from the main shaft, the second bearing mounting portion (215) is inserted into the interior of the extension shaft (223), and the second sliding bearing (242) is located between the radial outer side of the second bearing mounting portion (215) and the radial inner side of the extension shaft (223).

11. A wind turbine generator set, characterized in that: The wind turbine generator set includes an impeller, a generator, and a wind turbine generator set transmission system according to any one of claims 1 to 10, wherein the wind turbine generator set transmission system is connected between the impeller and the generator.

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