Transmission chain and wind generating set

Abstract

The invention provides a transmission chain and a wind generating set. The transmission chain comprises a bearing seat, a transmission shaft and a transmission shaft, the main shaft is rotatably supported in the bearing seat and is provided with a front end and a rear end which are opposite to each other; the gear box comprises a box body and a planet carrier arranged in the box body, the box body is fixedly connected with the rear end of the bearing seat, and the planet carrier is rigidly connected with the rear end of the main shaft; and the thrust bearing is arranged in the gear box. According to the transmission chain, the overall structure is compact, the shafting and the gearbox are highly integrated, and the transmission chain has the advantages of being light in weight, low in overall cost and the like.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind turbines, and particularly relates to a drive train for a wind turbine generator set and a wind turbine generator set having the drive train. Background Art

[0002] A wind turbine generator set uses a large wind turbine to obtain wind power and drive a generator to generate electricity, thereby realizing wind power generation. The wind turbine transmits power to the generator through a drive train. Since the rotation speed of the wind turbine under the action of wind power is relatively slow and far from reaching the rotation speed required for the generator to generate electricity, the drive train includes, in addition to the main shaft system, a gearbox connected to the rear end of the main shaft. By using the gearbox for speed change, the relatively low rotation speed on the wind turbine side is increased to a high enough rotation speed to drive the generator to generate electricity.

[0003] The traditional main shaft system includes a bearing housing, a main shaft, and rolling bearings arranged between the main shaft and the bearing housing. However, at present, the installed capacity of wind turbine generator sets is increasing, and the size of the units is also increasing. With the increase in the size of wind turbine generator sets, due to the difficulties in manufacturing technology, high material requirements, and large installation difficulties of rolling bearings, the cost of the shaft system design of rolling bearings is getting higher and higher. At present, the sliding shaft system has gradually become a new technical solution for the main drive train of wind turbine generator sets. Figure 1 It is a schematic diagram of the shaft system structure with sliding bearings in the prior art.

[0004] As Figure 1 shown, a radial bearing and a thrust bearing are respectively arranged at the front end and the rear end of the main shaft 10. The auxiliary thrust bearing 40 and the front radial bearing 60 are arranged at the front end of the main shaft 10, and the main thrust bearing 50 and the rear radial bearing 70 are arranged at the rear end of the main shaft 10. This structural design requires the radial bearing to have a large diameter, especially the front radial bearing requires a larger diameter, and the bearing housing 20 can only adopt an integral bearing housing. This solution has disadvantages such as high cost, large installation and maintenance difficulties of the bearings, etc. Summary of the Invention

[0005] The purpose of the present disclosure is to provide a drive train and a wind turbine generator set to solve the problems of large size, large installation and maintenance difficulties, etc. of the sliding bearing drive train in the prior art.

[0006] According to one aspect of the present disclosure, there is provided a drive train, the drive train including: a bearing housing; a main shaft rotatably supported in the bearing housing, having opposite front and rear ends; a gearbox including a housing and a planet carrier arranged in the housing, the housing being fixedly connected to the rear end of the bearing housing, and the planet carrier being rigidly connected to the rear end of the main shaft; and a thrust bearing arranged in the gearbox.

[0007] According to one aspect of the present disclosure, the gearbox is at least a one-stage speed-up gearbox, the planet carrier is a one-stage planet carrier disposed in the gearbox, and the thrust bearing is a sliding bearing disposed between the axial end of the planet carrier and the housing.

[0008] According to one aspect of the present disclosure, the thrust bearing is mounted on the housing to form a friction pair with the axial end face of the planet carrier, or the thrust bearing is mounted on the axial end face of the planet carrier to form a friction pair with the housing.

[0009] According to one aspect of the present disclosure, the housing includes a front housing, a middle housing, and a ring gear connected between the front housing and the middle housing. The thrust bearing includes a main thrust bearing and a secondary thrust bearing. The main thrust bearing is disposed between the axial rear end of the planet carrier and the middle housing, and the secondary thrust bearing is disposed between the axial front end of the planet carrier and the rear end of the bearing seat, or the secondary thrust bearing is disposed between the axial front end of the planet carrier and the radial inner flange of the front housing.

[0010] According to one aspect of the present disclosure, the transmission chain further includes a plurality of planet gears mounted on the planet carrier. The plurality of planet gears are spaced apart in the circumferential direction of the planet carrier, and the main thrust bearing is mounted on the axial rear end face of the planet carrier between two adjacent planet gears.

[0011] According to one aspect of the present disclosure, the planet carrier is an annular cylinder. The axial length of the annular cylinder is greater than the axial length of the planet gear. A plurality of planet gear mounting grooves are formed in the annular cylinder, and the plurality of planet gears are respectively mounted in the planet gear mounting grooves. Annular planes are formed at both axial ends of the annular cylinder.

[0012] According to one aspect of the present disclosure, the bearing seat includes a separately provided front bearing seat and a rear bearing seat. The radial bearing includes a front radial bearing and a rear radial bearing. The front radial bearing is disposed between the front bearing seat and the main shaft, and the rear radial bearing is disposed between the rear bearing seat and the main shaft.

[0013] According to one aspect of the present disclosure, the secondary thrust bearing is disposed between the rear end face of the rear bearing seat and the front end face of the planet carrier.

[0014] According to one aspect of the present disclosure, the bearing seat and the front housing are provided as an integral structure, or the bearing seat and the front housing are separately provided and connected to each other by fasteners.

[0015] According to one aspect of the present disclosure, the radial bearing includes a front radial bearing and a rear radial bearing. The front radial bearing is disposed between the bearing housing and the outer periphery of the front end of the main shaft. The rear radial bearing is disposed on the radially outer surface of the planet carrier, and a friction pair is formed between the rear radial bearing and the radially inner surface of the housing, or the rear radial bearing is mounted on the radially inner surface of the housing, and a friction pair is formed between the rear radial bearing and the radially outer surface of the planet carrier.

[0016] According to one aspect of the present disclosure, the main shaft and the planet carrier are provided as an integral structure, or the main shaft and the planet carrier are separately provided and connected to each other by fasteners.

[0017] According to one aspect of the present disclosure, the radial bearing is mounted on the main shaft, and a friction pair is formed between the radial bearing and the bearing housing, or the radial bearing is mounted on the bearing housing, and a friction pair is formed between the radial bearing and the main shaft.

[0018] According to one aspect of the present disclosure, the radial bearing and the thrust bearing include one of a tapered bearing bush and a spherical bearing bush.

[0019] According to one aspect of the present disclosure, the transmission chain is for mounting between the impeller and the generator of the wind turbine generator set.

[0020] According to another aspect of the present disclosure, there is provided a wind turbine generator set, which includes the transmission chain as described above.

[0021] According to the embodiments of the present disclosure, it is possible to realize the split bearing housing design layout of the sliding bearing fan main shaft system, to realize convenient unit maintenance, and to reduce the weight and cost of the transmission chain. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Through the description with reference to the accompanying drawings which exemplarily show an example, the above and other objects and features of the present disclosure will become clearer, wherein:

[0023] Figure 1 is a schematic diagram of the shafting structure in the prior art;

[0024] Figure 2 is a schematic diagram of the structure of the transmission chain according to the embodiment of the present disclosure;

[0025] Figure 3 is a schematic diagram of the installation of the main thrust bearing in the transmission chain according to the embodiment of the present disclosure;

[0026] Figure 4 is a schematic diagram of the installation of the secondary thrust bearing in the transmission chain according to the embodiment of the present disclosure;

[0027] Figure 5It is a schematic installation diagram showing a radial bearing according to an embodiment of the present disclosure. Detailed implementation manners

[0028] The following detailed implementation manners are provided to assist the reader in obtaining a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of the present disclosure, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be clear. For example, the order of operations described herein is merely exemplary and is not limited to those set forth herein. Rather, it may 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, descriptions of features known in the art may be omitted for greater clarity and conciseness.

[0029] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. On the contrary, the examples described herein are provided only to illustrate some of the many feasible ways of implementing the methods, devices, and / or systems described herein, which will be clear after understanding the disclosure of the present disclosure.

[0030] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more of them.

[0031] Although terms such as "first", "second", and "third" may be used herein to describe various components, components, regions, layers, or parts, these components, components, regions, layers, or parts should not be limited by these terms. On the contrary, these terms are only used to distinguish one component, component, region, layer, or part from another component, component, region, layer, or part. Thus, the first component, first component, first region, first layer, or first part referred to in the examples described herein may also be referred to as the second component, second component, second region, second layer, or second part without departing from the teachings of the examples.

[0032] In the specification, when an element such as a layer, region, or substrate is described as "on", "connected to", or "coupled to" another element, the element may be directly "on", directly "connected to", or "coupled to" the other element, or there may be one or more other elements in between. On the contrary, when an element is described as "directly on", "directly connected to", or "directly coupled to" another element, there may be no other elements in between.

[0033] The terms used herein are for describing various examples only and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising", "including" and "having" specify 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 quantity of two or more.

[0034] The definitions of orientation terms in this disclosure are based on the orientation of the product in its normal use state, unless otherwise specified as being based on the orientation in the drawings.

[0035] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains after understanding this disclosure. Terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this disclosure, and shall not be interpreted in an idealized or overly formal manner, unless explicitly defined as such herein.

[0036] To solve the problems of large weight, high cost, complex structure, etc. existing in the drive chain of the prior art, embodiments of the present disclosure provide a drive chain for a wind turbine generator. Below, with reference to the attached Figures 2 to 4 , embodiments of the present invention will be described in detail.

[0037] As Figure 2 shown, the drive chain includes a shaft system 100 and a gearbox 200 connected to each other. The shaft system 100 includes a bearing housing 110 and a main shaft 120 rotatably disposed in the bearing housing 110. The gearbox 200 includes a housing 220 and a planet carrier 210 disposed in the housing 220. The housing 220 is fixedly connected to the rear end of the bearing housing 110 to form a stationary support structure. The planet carrier 210 is rigidly connected to the rear end of the main shaft 120 to form a rotating structure for transmitting power. The drive chain according to an embodiment of the present disclosure further includes a bearing assembly, which is installed between the support structure and the rotating structure to support the rotating structure, reduce the friction coefficient during movement, make the rotation smoother and more stable, reduce energy loss and transmission noise, and reduce component wear, improve the service life of components, and ensure the stable operation of the equipment.

[0038] According to the direction of torque transmission, the main shaft 120 has opposite front and rear ends. More specifically, the end of the main shaft 120 that receives torque input is defined as the front end, and the end of the main shaft 120 that outputs torque is defined as the rear end.

[0039] When applied to a wind turbine generator set, the front end of the main shaft 120 is used to connect to the hub of the wind turbine generator set. After receiving torque from the hub, it is transmitted to the generator through the gearbox 200. The bearing assembly needs to bear the radial force caused by the weight of the impeller and the hub, and also needs to bear the force exerted by the wind on the main shaft through the impeller. Therefore, in the drive train according to an embodiment of the present disclosure, the bearing assembly includes a radial bearing 130 and a thrust bearing 230. The radial bearing 130 is disposed between the support structure and the rotating structure and is used to bear the load perpendicular to the axis direction of the main shaft 120, that is, the load in the radial direction of the main shaft 120. The thrust bearing 230 is also disposed between the support structure and the rotating structure and is used to bear the axial load.

[0040] As Figure 2 shown, the gearbox 200 is a speed-increasing gearbox and is used to increase the low speed and large torque of the hub to high speed and small torque and then transmit it to the generator. The gearbox 200 generally includes a housing 220, an input shaft, a speed-increasing gear set, and an output shaft. The input shaft is used to connect to the main shaft 120 of the shaft system 100, and the output shaft is used to connect to the rotor of the generator. According to an embodiment of the present invention, the gearbox 200 is at least a single-stage speed-increasing gearbox. However, the present invention does not limit the number of speed-increasing stages of the gearbox, and the gearbox 200 may also be a two-stage or three-stage speed-increasing gearbox. In the case where the gearbox 200 is a two-stage or three-stage speed-increasing gearbox, since the planet carrier 210 needs to be rigidly connected to the main shaft 120, the planet carrier 210 is a first-stage planet carrier in the gearbox 200, and one end of the planet carrier 210 receives torque input as the input shaft of the gearbox.

[0041] An external gear ring 223 is provided on the housing 220 of the gearbox. The planet carrier 210 is disposed in the housing 220, and planet gears 250 are mounted on the planet carrier 210 and mesh with the external gear ring 223. One end of the planet carrier 210 forms the input shaft of the gearbox 200 and is fixedly connected to the main shaft 120. When the main shaft 120 rotates, it can drive a plurality of planet gears 250 to rotate. The inner sides of the plurality of planet gears 250 mesh with the sun gear 260, and after being speeded up by the sun gear 260, it is transmitted to the next-stage speed-increasing gear set or transmitted to the generator. The setting structure of the speed-increasing gear set of the gearbox 200 is not the focus of the present invention, so it will not be described in detail here. Next, the setting structure of the bearing assembly according to an embodiment of the present invention will be described in detail.

[0042] According to an embodiment of the present disclosure, a thrust bearing 230 is disposed in a gearbox 200. Specifically, it is disposed between the axial end of a planet carrier 210 and a support structure of a transmission chain, and the planet carrier 210 is used to bear the axial load. The thrust bearing 230 includes a main thrust bearing 231 and an auxiliary thrust bearing 232. According to an embodiment of the present invention, at least one of the main thrust bearing 231 and the auxiliary thrust bearing 232 is installed between the planet carrier 210 and the support structure. For example, the main thrust bearing 231 is installed at the axial rear end of the planet carrier 210, and the auxiliary thrust bearing 232 is installed at the axial front end of the planet carrier 210.

[0043] As Figure 1 shown, in the prior art, a thrust bearing is usually installed in a shafting. However, in this case, the bearing housing 20 needs to be an integral bearing, which is not convenient for the maintenance of the radial bearing. If the bearing housing 20 is designed as a split structure for the convenience of the installation and maintenance of the radial bearing, an outwardly convex thrust disc needs to be provided on the outer periphery of the main shaft 10, and the main thrust bearing and the auxiliary thrust bearing are installed on both axial sides of the thrust disc. In addition, a clamping structure for clamping the thrust bearing, a corresponding support structure, an external sealing structure, etc. need to be provided. Such a set structure will lead to a more complex structure of the shafting, an increase in the number of additional components, resulting in various problems such as an increase in the weight of the transmission chain and an increase in cost.

[0044] However, according to an embodiment of the present disclosure, by installing the thrust bearing 230 in the gearbox 200 and using the existing planet carrier structure in the transmission chain to install the thrust bearing or form a friction pair with the thrust bearing, even when the bearing housing 110 is designed as a split structure, it is not necessary to additionally provide components such as a thrust disc, a corresponding clamping structure, and a support structure on the main shaft 120, reducing the components of the transmission chain, with a compact overall structure and high integration with the gearbox, having the advantages of light weight and low cost.

[0045] Next, refer to the attached Figure 2 to the attached Figure 4 to describe the embodiments of the present disclosure in detail.

[0046] As Figure 2As shown, the housing 220 includes a front housing 221 and a middle housing 222, which are respectively installed at the front end and the rear end of the planet carrier 210. The outer gear ring 223 is connected between the front housing 221 and the middle housing 222, and internal teeth are formed on the inner side of the outer gear ring 223. A plurality of planet gears 250 are arranged on the planet carrier 210, and the outer circumference of the planet gears 250 protrudes radially outward relative to the planet carrier 210 so as to mesh with the outer gear ring 223. The front housing 221 is located at the front end of the planet carrier 210, and the middle housing 222 is located at the axial rear end of the planet carrier 210. Specifically, the planet carrier 210 is formed as an annular cylinder, and a plurality of planet gear mounting grooves are arranged at intervals on the annular cylinder in the circumferential direction. The plurality of planet gears 250 are respectively arranged in the plurality of planet gear mounting grooves through planet gear rotating shafts 251. It can be seen that the axial length of the planet carrier 210 is greater than the axial length of the planet gears 250, so as to extend out relative to the axial two ends of the planet gears 250. Thus, flat structures can be formed at the axial two ends of the planet carrier 210 as thrust bearing installation planes or friction planes.

[0047] The main thrust bearing 231 is arranged between the axial rear end of the planet carrier 210 and the middle housing 222. The main thrust bearing 231 can be fixedly installed on the planet carrier 210. As the planet carrier 210 rotates, a rotational friction pair is formed with the middle housing 222. The main thrust bearing 231 can also be fixedly installed on the axial inner surface of the middle housing 222 facing the planet carrier 210, and the axial rear end face of the planet carrier 210 serves as a friction surface. Thus, a rotational friction pair is formed between the main thrust bearing 231 and the planet carrier 210.

[0048] Figure 3 An example of fixedly installing the main thrust bearing 231 on the planet carrier 210 is shown. As Figure 2 and Figure 3 shown, the plurality of planet gears 250 are respectively rotatably installed on the planet carrier 210 through a plurality of planet gear rotating shafts 251 and are arranged at intervals in the circumferential direction of the planet carrier 210. The main thrust bearing 231 includes a plurality of main thrust bearing pads 2311. The plurality of main thrust bearing pads 2311 are arranged at intervals in the circumferential direction of the planet carrier 210, and each main thrust bearing pad 2311 is arranged between two adjacent planet gears 250. While making full use of the axial end face of the planet carrier 210, the clearance area between the planet gears 250 is utilized to avoid interference with the planet gear rotating shafts 251.

[0049] According to an embodiment of the present invention, the auxiliary thrust bearing 232 can also be installed in the gearbox 200. For example, the auxiliary thrust bearing 232 is installed at the axial front end of the planet carrier 210.

[0050] As Figure 2As shown, the front end of the planet carrier 210 has a relatively flat surface. The secondary thrust bearing 232 can be installed between the axial front end of the planet carrier 210 and the axial rear end of the bearing housing 110 of the shafting 100. The secondary thrust bearing 232 can be fixedly installed on the bearing housing 110, so as to form a friction pair with the axial front end face of the planet carrier 210. Optionally, the secondary thrust bearing 232 can be installed on the axial front end face of the planet carrier 210 and rotate with the planet carrier 210, so as to form a friction pair with the axial rear end face of the bearing housing 110.

[0051] When the secondary thrust bearing 232 is installed between the front end face of the planet carrier 210 and the rear end face of the bearing housing 110, the front housing 221 is formed in a cylindrical shape and is located radially outside the secondary thrust bearing 232. After being separately formed from the bearing housing 110, it is fixedly connected by fasteners, or can also be formed as an integral structure with the bearing housing 110.

[0052] In addition, the secondary thrust bearing 232 can also be installed between the front housing 221 and the front end face of the planet carrier 210. For example, a radially extending support flange can also be formed on the inner side of the front housing 221, and the secondary thrust bearing 232 is installed between the support flange and the planet carrier 210. As an example, the secondary thrust bearing 232 can be installed on the planet carrier 210 to form a friction pair with the support flange on the inner side of the front housing 221, and vice versa.

[0053] Figure 4 An example of the secondary thrust bearing 232 installed on the planet carrier 210 is shown. As Figure 4 shown, the secondary thrust bearing 232 includes a plurality of secondary thrust pads 2321, and the plurality of secondary thrust pads 2321 are spaced apart in the circumferential direction of the planet carrier 210 on the axial front end surface of the planet carrier 210.

[0054] According to an embodiment of the present invention, by using the axial end surface of the planet carrier 210 to install the thrust bearing 230, the thrust bearing 230 is highly integrated in the gearbox 200, so that there is no need to additionally provide a thrust disk and corresponding thrust pad support or clamping structure on the main shaft 120. By using the existing structure of the planet carrier 210 itself, the structure of the existing transmission is less modified, the existing die structure can be fully utilized, the manufacturing process is simplified, and the manufacturing cost is reduced.

[0055] According to an embodiment of the present invention, the bearing assembly further includes a radial bearing 130. The radial bearing 130 is arranged on the radial outside of the rotating structure and the radial inside of the supporting structure, so as to bear radial loads.

[0056] Figure 5The schematic installation structure of the radial bearing 130 is shown. The radial bearing 130 includes a plurality of radial bearing bushes, which are located between the main shaft 120 and the bearing housing 110 and are spaced circumferentially around the main shaft 120. The radial bearing 130 can be fixed to the main shaft 120 and rotate together with the main shaft 120, so that the inner surface of the bearing housing 110 serves as a friction surface. The radial bearing 130 can also be fixedly installed on the bearing housing 110, so as to form a friction pair with the outer peripheral surface of the main shaft 120.

[0057] As Figure 2 shown, the radial bearing 130 includes a front radial bearing 131 and a rear radial bearing 132, which are spaced axially along the main shaft 120 and respectively provide rotational support at the front and rear ends of the main shaft 120.

[0058] The bearing housing 110 can be of an integral structure, and the front radial bearing 131 and the rear radial bearing 132 are respectively located on the radial inner sides at the front and rear ends of the bearing housing 110. For the convenience of the maintenance of the radial bearing, a radial bearing maintenance hole can be opened on the bearing housing 110. For example, the radial bearing bushes are fixedly installed on the main shaft 120. When a certain radial bearing bush needs to be maintained or replaced, the main shaft 120 can be rotated to rotate the block to be replaced to a position corresponding to the maintenance hole. As Figure 2 described, a front radial bearing maintenance hole is opened at the front end of the bearing housing 110, and a rear radial bearing maintenance hole is opened at the rear end of the bearing housing 110. A front maintenance cover plate 141 and a rear maintenance hole cover plate 142 can also be provided on the maintenance hole to respectively cover the front radial bearing maintenance hole and the rear radial bearing maintenance hole.

[0059] According to an embodiment of the present disclosure, the rear radial bearing 132 can also be arranged in the gearbox 200. More specifically, the rear radial bearing 132 can be arranged between the radial outer side of the planet carrier 210 and the radial inner side surface of the housing 220. For example, it can be arranged between the radial outer side of the planet carrier 210 and the radial inner side of the front housing 221, or arranged between the radial outer side of the planet carrier 210 and the radial inner side of the middle housing 222. Similarly, the rear radial bearing 132 can be fixed on the radial outer side surface of the planet carrier 210 or fixed on the radial inner side surface of the housing 220.

[0060] According to an embodiment of the present disclosure, the front housing 221 and the bearing housing 110 can be separately provided and connected to each other by fasteners, or can be formed into an integral structure. For example, the front housing 221 and the rear end of the bearing housing 110 are formed into an integral structure, so as to provide a more stable rotational support for the rotating components. By integrally designing the front housing 221 and the bearing housing 110, the two are combined into one. Since the joint surface between the bearing housing 110 and the front housing 221 is removed, at the same time, the processes such as the machining and surface treatment of the joint surface are removed, and the connecting parts between the two are removed, which is beneficial to reducing the manufacturing cost.

[0061] For example, the bearing housing 110 is formed as a split structure, including a front bearing for supporting the front radial bearing and a rear bearing housing for supporting the rear radial bearing. In this case, by designing the rear bearing housing and the front housing 221 as one part, the loads of the thrust bearing 230 and the rear radial bearing 132 both act on the rear bearing housing. The front bearing housing only has radial force and no thrust force, providing a more stable support for the hub and the impeller, and facilitating the full utilization of the advantages of structural integration to reduce the overall design cost.

[0062] According to an embodiment of the present disclosure, the main shaft 120 and the planet carrier 210 can be separately provided and connected to each other by fasteners, or can be integrally designed, combining the two into one. By setting the main shaft 120 and the planet carrier 210 as an integral structure, since the joint surface between the main shaft 120 and the planet carrier 210 is removed, at the same time, the processes such as machining and surface treatment of the joint surface are removed, and the connecting parts between the two are removed, which is beneficial to reducing the manufacturing cost.

[0063] According to an embodiment of the present disclosure, the bearing housing 110 can be designed as a split structure, which is beneficial to providing more maintenance space. For example, the space between the front bearing housing and the rear bearing housing can be utilized to extract and replace the bearing bushings to be replaced in the front radial bearing 131 and the rear radial bearing 132 along the axial direction of the main shaft 120. In addition, by splitting the design of the bearing housing 110, the materials used for the bearing housing 110 can be reduced, and the manufacturing cost and design weight of the bearing housing can be reduced.

[0064] According to an embodiment of the present disclosure, the radial bearing and the thrust bearing can both adopt other forms such as tapered bearing bushings, spherical bearing bushings, and combinations of tapered bearing bushings with different angles.

[0065] According to an embodiment of the present disclosure, smooth and continuous support planes are conveniently provided on the planet carrier 210, the front housing 221, and the middle housing 222, which can be used for installing bearings or as sliding friction surfaces. The embodiments of the present disclosure make full use of the structural characteristics of these components to set the installation structures of the radial bearing and the thrust bearing, which is beneficial to simplifying the structure of the transmission chain, reducing costs, and improving reliability.

[0066] By arranging the thrust bearing in the gearbox, it is beneficial to realize the design layout of the split bearing housing of the sliding bearing fan main shaft system. Since the axial end faces of the planet carrier are fully utilized, there is no need to set a thrust disc and corresponding other structures in the shafting 100. Therefore, this solution has obvious advantages in terms of the overall design weight and manufacturing cost, and can reduce the weight and cost of the shafting. By splitting the design of the bearing housing, convenient maintenance of the unit can be realized.

[0067] Although the embodiments of the present disclosure have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the present disclosure. 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 disclosure defined by the claims.

Claims

1. A transmission chain, characterized in that, The transmission chain includes: a bearing housing (110); a main shaft (120) rotatably supported in the bearing housing (110) and having opposite front and rear ends; a gearbox (200) including a housing (220) and a planet carrier (210) disposed in the housing (220), the housing (220) being fixedly connected to the rear end of the bearing housing (110), and the planet carrier (210) being rigidly connected to the rear end of the main shaft (120); a thrust bearing (230) disposed in the gearbox (200).

2. The drive chain according to claim 1, characterized in that, The gearbox (200) is at least a one-stage speed-increasing gearbox, the planet carrier (210) is a first-stage planet carrier disposed in the gearbox (200), and the thrust bearing (230) is a sliding bearing disposed between the axial end of the planet carrier (210) and the housing (220).

3. The drive chain according to claim 2, characterized in that, The thrust bearing is mounted on the housing (220) to form a friction pair with the axial end face of the planet carrier (210), or the thrust bearing (230) is mounted on the axial end face of the planet carrier (210) to form a friction pair with the housing (220).

4. The drive chain according to claim 3, characterized in that, The housing includes a front housing (221), a middle housing (222), and a ring gear (223) connected between the front housing (221) and the middle housing (222). The thrust bearing (230) includes a main thrust bearing (231) and an auxiliary thrust bearing (232). The main thrust bearing (231) is disposed between the axial rear end of the planet carrier (210) and the middle housing (222), and the auxiliary thrust bearing (232) is disposed between the axial front end of the planet carrier (210) and the rear end of the bearing housing, or the auxiliary thrust bearing (232) is disposed between the axial front end of the planet carrier (210) and the radial inner flange of the front housing (221).

5. The drive chain according to claim 4, characterized in that, The transmission chain further includes a plurality of planet gears (250) mounted on the planet carrier (210). The plurality of planet gears (250) are spaced apart in the circumferential direction of the planet carrier (210), and the main thrust bearing (231) is mounted on the axial rear end face of the planet carrier (210) between two adjacent planet gears (250).

6. The drive chain according to claim 5, characterized in that, The planet carrier (210) is an annular cylinder. The axial length of the annular cylinder is greater than the axial length of the planet gear (250). A plurality of planet gear mounting grooves are formed in the annular cylinder, and the plurality of planet gears (250) are respectively mounted in the planet gear mounting grooves. Annular planes are formed at both axial ends of the annular cylinder.

7. The drive chain according to claim 4, characterized in that, The bearing housing (110) includes a separately provided front bearing housing and a rear bearing housing. The transmission chain further includes a front radial bearing and a rear radial bearing. The front radial bearing is disposed between the front bearing housing and the main shaft (120), and the rear radial bearing is disposed between the rear bearing housing and the main shaft (120).

8. The drive chain according to claim 7, characterized in that, The auxiliary thrust bearing (232) is disposed between the rear end face of the rear bearing housing and the front end face of the planet carrier (210).

9. The drive chain according to claim 7 or 8, characterized in that, The bearing housing (110) and the front housing (221) are integrally provided, or the bearing housing (110) and the front housing (221) are separately provided and connected to each other by fasteners.

10. The drive chain according to claim 1, characterized in that, The transmission chain further includes a front radial bearing (131) and a rear radial bearing (132). The front radial bearing (131) is provided between the bearing housing and the outer periphery of the front end of the main shaft (120). The rear radial bearing (132) is installed on the radial outer surface of the planet carrier (210), and a friction pair is formed between the rear radial bearing (132) and the radial inner surface of the housing (220), or the rear radial bearing (132) is installed on the radial inner surface of the housing (220), and a friction pair is formed between the rear radial bearing (132) and the radial outer surface of the planet carrier (210).

11. The drive chain according to claim 1, characterized in that, The main shaft (120) and the planet carrier (210) are of an integral structure, or the main shaft (120) and the planet carrier (210) are separately provided and connected to each other by fasteners.

12. The drive chain according to claim 1, wherein, The transmission chain further includes a radial bearing (130). The radial bearing (130) is installed on the main shaft (120), and a friction pair is formed between the radial bearing (130) and the bearing housing (110), or the radial bearing (130) is installed on the bearing housing (110), and a friction pair is formed between the radial bearing (130) and the main shaft (120).

13. The transmission chain according to claim 1, wherein, The radial bearing (130) and the thrust bearing (230) include one of a tapered bearing bush and a spherical bearing bush.

14. The drive chain according to any one of claims 1 to 13, characterized in that, The transmission chain is used to be installed between the impeller and the generator of the wind turbine generator set.

15. A wind turbine generator, characterized in that, The wind turbine generator set includes the transmission chain according to any one of claims 1-14.

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