Support device for a shafting and wind turbine generator system

Abstract

The application provides a support device for a shaft system and a wind turbine generator. The shaft system comprises a first shaft, a second shaft and a bearing arranged between the first shaft and the second shaft, the first shaft is sleeved on the outer circumferential side of the second shaft and can rotate relative to the second shaft through the bearing, the support device is arranged on the first end in the axial direction of the shaft system, the support device comprises: an axle end support, at least a part of the axle end support is rotatably supported on the outer side of the axle end surface of the first end of the second shaft in the axial direction; a connecting assembly, the connecting assembly is arranged between the first end of the first shaft and the axle end support in the axial direction of the shaft system; and a pre-tightening member, the pre-tightening member is adjustably connected with the axle end support and the connecting assembly. The application can make the bearing of the shaft system not bear axial load or reduce the axial load acting on the bearing of the shaft system, and improve the service life of the bearing.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and more specifically, to a support device for a shaft system and a wind turbine generator set. Background Technology

[0002] A wind turbine generator includes a fixed shaft and a moving shaft coaxially arranged, and a main bearing disposed between the fixed shaft and the moving shaft. In actual operation, the wind turbine blades transfer the wind load they bear to the hub, the hub transfers the load to the main bearing via the moving shaft, and then to the fixed shaft via the main bearing. Since the axial wind load in a constant direction can only be borne by the main bearing, it affects the fatigue life of the main bearing. Furthermore, the main bearing is located in the generator's shaft system, making disassembly and maintenance inconvenient, which in turn affects the overall quality and lifespan of the wind turbine generator. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention provides a support device for a shaft system and a wind turbine generator set. This support device can prevent axial loads from acting directly on the bearings of the shaft system or reduce the axial loads acting on the bearings of the shaft system, thereby improving the fatigue life of the bearings of the shaft system.

[0004] According to one aspect of the present invention, a support device for a shaft system is provided, the shaft system including a first shaft, a second shaft, and a bearing disposed between the first shaft and the second shaft. The first shaft is sleeved on the outer periphery of the second shaft and is rotatable relative to the second shaft via the bearing. The support device is disposed at a first end of the shaft system in the axial direction. The support device includes: a shaft end support member, at least a portion of which is rotatably supported in the axial direction on the outer side of the shaft end face of the first end of the second shaft; a connecting assembly in the axial direction of the shaft system, the connecting assembly being used to connect the first end of the first shaft and the shaft end support member; and a preload member, the preload member being adjustablely connected to the connecting assembly and the shaft end support member. By applying axial prestress to the first shaft using this support device, the bearings of the shaft system can be made to essentially not bear axial load or the axial load acting on the bearings of the shaft system can be reduced, thereby improving the service life of the bearings.

[0005] According to an exemplary embodiment of the present invention, the support device further includes: a support portion, the first end of which faces the shaft end support member in the axial direction, and the second end of which is fixedly connected to the shaft end face of the first end of the second shaft; a bearing, which is disposed at the first end of the support portion and is located on the outside of the support portion in the radial direction of the shaft system, the shaft end support member is supported on the support portion by the bearing and is rotatable relative to the support portion by the bearing.

[0006] According to an exemplary embodiment of the present invention, the shaft end support may include a connecting end cap and a mounting seat connected to the outer periphery of the connecting end cap. The connecting end cap includes a shaft end top plate and a cylindrical body extending from the shaft end top plate along the axial direction of the shaft system toward a second end of the shaft system. The mounting seat is formed on the outer periphery of the cylindrical body. In the radial direction of the shaft system, the inner diameter of the cylindrical body is larger than the outer contour dimension of the first end of the support portion. The cylindrical body is sleeved on the first end of the support portion, and a bearing bearing is disposed between the inner side of the cylindrical body and the outer side of the first end of the support portion.

[0007] According to an exemplary embodiment of the present invention, the connecting assembly may include: a fixing seat for fixing a shaft end face to a first end of a first shaft; and a connecting portion for connecting the fixing seat and the mounting seat.

[0008] According to an exemplary embodiment of the present invention, the connecting part may be a rod-shaped member distributed at intervals along the circumferential direction of the support part, and the rod-shaped member is hinged to the fixed seat, so that the installation and disassembly of the rod-shaped member and the fixed seat are more flexible and convenient.

[0009] According to an exemplary embodiment of the present invention, the number of rod-shaped members may be two or more, and the number of fixing seats, mounting seats and rod-shaped members corresponds to each other.

[0010] According to an exemplary embodiment of the present invention, the cylinder may be in the shape of a flared mouth with a diameter that increases from the top plate of the shaft end along the axial direction of the shaft system toward the second end of the shaft system, and the mounting base is a support leg that extends outward from the outer periphery of the cylinder.

[0011] According to an exemplary embodiment of the present invention, the preload can be a nut, the first end of the rod-shaped member is provided with an external thread, the mounting base is provided with a through hole, and the first end of the rod-shaped member passes through the through hole and is threadedly connected to the nut.

[0012] According to an exemplary embodiment of the present invention, the connecting component is a cylindrical member, a first bearing seat is provided at the first end of the cylindrical member along the axial direction, a bearing bearing is arranged radially between the radial inner side wall of the first bearing seat and the radial outer side wall of the support part, and a first fixing seat is provided at the second end of the cylindrical member along the axial direction to be connected to the shaft end face of the first end of the first shaft; the shaft end support is an annular plate, and the annular plate is connected to the axial end face of the first bearing seat.

[0013] According to an exemplary embodiment of the present invention, the preload can be a bolt, and the shaft end support and the first bearing housing are respectively formed with a first threaded hole and a second threaded hole extending in the axial direction, and the bolt is sequentially threaded to the first threaded hole and the second threaded hole.

[0014] According to an exemplary embodiment of the present invention, the support portion may include a second fixed seat, a support member and a second bearing seat along the axial direction. The second fixed seat is fixedly connected to the shaft end face of the first end of the second shaft, and the bearing is disposed radially between the radial inner wall of the connecting assembly and the radial outer wall of the second bearing seat.

[0015] According to an exemplary embodiment of the present invention, the support member may be inclined from the second bearing seat toward the second fixed seat.

[0016] According to an exemplary embodiment of the present invention, the support member may be a rod-shaped member spaced apart along the circumferential direction of the support portion; or the support member may be a cylindrical member.

[0017] According to an exemplary embodiment of the present invention, the support device may further include a spring, which is axially disposed between the bearing and the shaft end support and contacts the axial inner end face of the shaft end support.

[0018] According to another aspect of the present invention, a wind turbine generator set is provided, the wind turbine generator set comprising: the aforementioned support device for the shaft system; and a generator comprising the aforementioned shaft system.

[0019] According to an exemplary embodiment of the present invention, the bearing may be a double-row roller bearing, so that the preload transmitted to the load-bearing bearing is uniform. The support device for shaft systems of the present invention can prevent axial loads from acting directly on the bearings of the shaft system or reduce the axial loads acting on the bearings of the shaft system, thereby improving the fatigue life of the bearings of the shaft system.

[0020] In a wind turbine generator set employing the present invention, including the aforementioned support device for the shaft system, when the axial wind load is transmitted to the moving shaft, the axial preload generated by the aforementioned support device for the shaft system can offset the axial wind load, transferring the axial wind load to the fixed shaft without passing through the main bearing. This results in the main bearing not bearing an axial load or bearing a smaller axial load, thereby achieving uniform loading of the front and rear rows of rollers in the double-row tapered roller bearing, improving the overall fatigue life of the main bearing, and making the bearing's service life greater than its design life. Attached Figure Description

[0021] The exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which will make the above and other features and advantages of the present invention more apparent. In the accompanying drawings:

[0022] Figure 1 This is a schematic perspective view of a shaft system including a support device for a shaft system according to an exemplary embodiment of the present invention;

[0023] Figure 2 It is along Figure 1 A partial cross-sectional view taken from line II;

[0024] Figure 3 yes Figure 2 A magnified view of a portion of the image;

[0025] Figure 4This is a schematic perspective view of a shaft system including a support device for a shaft system according to another exemplary embodiment of the present invention;

[0026] Figure 5 yes Figure 4 A schematic three-dimensional view of the axis system shown from another perspective;

[0027] Figure 6 It is along Figure 4 A partial cross-sectional view taken from line II-II;

[0028] Figure 7 This is an enlarged schematic diagram showing the structure of a double-row roller bearing.

[0029] Explanation of icon numbers:

[0030] 1: First shaft; 2: Second shaft; 3: Bearing; 4: Bearing outer ring end cap; 5: Bearing inner ring end cap; 6: Fixed seat; 7: Connecting part; 8, 15: Shaft end support; 9: Spring; 10: Support part; 11: Load bearing; 12: Shim; 13, 16: Preload; 14, 17: Connecting assembly; 18: First fixed seat; 19: First bearing seat; 20: Second fixed seat; 21: Support member; 22: Second bearing seat; 23: Connecting end cap; 24: Mounting seat; 25: Shaft end top plate; 26: Cylinder. Detailed Implementation

[0031] Embodiments of the invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated.

[0032] A shaft system typically includes a first shaft 1, a second shaft 2, and a bearing 3 disposed between the first shaft 1 and the second shaft 2. The first shaft 1 is fitted onto the outer periphery of the second shaft 2, and the bearing 3 is radially positioned between the first shaft 1 and the second shaft 2, allowing the first shaft 1 to rotate relative to the second shaft 2 via the bearing 3. When a rotating component connected to the first shaft 1 (e.g., a moving shaft) is subjected to an axial load, the axial load is transmitted to the bearing 3 via the first shaft 1, and then to the second shaft 2 (e.g., a fixed shaft) via the bearing 3. During this process, the bearing 3 bears a portion of the axial load, which will affect its fatigue life. Furthermore, because the bearing 3 is located within the shaft system, maintenance, disassembly, and replacement are difficult and costly.

[0033] To solve at least one of the aforementioned technical problems, the present invention provides a support device for being disposed at a first end in the axial direction of a shaft system. In the present invention, for example, based on... Figure 2As shown in the diagram, the end of a component or assembly located axially to the right of its center is referred to as the first end, and the end of the component or assembly located axially to the left of its center is referred to as the second end. A portion of the support device is fixedly connected to the first shaft 1, and another portion is fixedly connected to the second shaft 2 to provide an adjustable axial preload (or axial prestress load). This allows at least a portion of the axial load generated by the rotating component to be offset by the axial prestress provided by the support device, or to be transmitted to the second shaft 2 through the support device without passing through the bearing 3. This avoids the axial load acting directly on the bearing 3 or reduces the axial load acting on the bearing 3, thereby improving the fatigue life of the bearing 3.

[0034] The structure of the support device for shaft systems of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] Combined with this application Figures 1 to 3 According to an exemplary embodiment of the present invention, a support device for a shaft system includes: a shaft end support 8, at least a portion of which is axially supported on the outer side of the shaft end face of a first end of a second shaft 2; a connecting assembly 17 connected between the first end of the first shaft 1 and the shaft end support 8; and a preload member 13 adjustably connected to the connecting assembly 17 and the shaft end support 8 for applying an axial prestress to the first shaft 1 from the first end toward the outside of the shaft system (e.g., the outside of the shaft system in the axial direction). As an example, the preload member 13 may apply a preload force (which may be along the axial direction of the shaft system or at a predetermined angle to the axial direction of the shaft system) to the first shaft 1 away from the first shaft 1 along the length direction of the connecting assembly 17, thereby applying an axial prestress to the first shaft 1.

[0036] The shaft end support 8 is rotatably supported to the end of the first end of the second shaft 2 relative to the second shaft 2, so that the connecting assembly 17 can rotate relative to the second shaft 2 and can provide positioning support for the connecting assembly 17.

[0037] Typically, the first end faces of the second shaft 2 and the first end face of the first shaft 1 are approximately flush in the axial direction. In this case, to provide sufficient axial prestress or to increase the adjustment range of the axial prestress, the support device may further include: a support portion 10, the first end of which faces the shaft end support member 8 in the axial direction, and the second end of which is fixedly connected to the shaft end face of the first end of the second shaft 2; a bearing 11, which is disposed at the first end of the support portion 10 and located radially outside the support portion 10, and the shaft end support member 8 is supported on the support portion 10 by the bearing 11 and is rotatable relative to the support portion 10 by the bearing 11. If the first end of the second shaft 2 protrudes axially by a predetermined length relative to the first shaft 1, the protruding portion of the second shaft 2 relative to the first end of the first shaft 1 can be used as the aforementioned support portion 10, and the shaft end support member 8 can be directly supported on the protruding portion of the second shaft 2. In other words, it can be understood that the support portion 10 and the second shaft 2 can be formed separately and then fixed together, or the support portion 10 can be integrally formed with the second shaft 2. For existing wind turbine generator sets, the support part 10 can be formed separately and then installed onto the second shaft 2 for easy installation and disassembly.

[0038] The support portion 10 includes a second fixed seat 20, a support member 21, and a second bearing seat 22 arranged axially. The second fixed seat 20 is fixedly connected to the shaft end face of the first end of the second shaft 2. The bearing 11 is radially disposed between the radially inner sidewall of the connecting assembly 17 and the radially outer sidewall of the second bearing seat 22. The support member 21 is inclined from the second bearing seat 22 toward the second fixed seat 20. In order to increase the bearing area of ​​the axial prestress load and reduce the bearing capacity of the support member 21, the support member 21 may be gradually extended from the second bearing seat 22 toward the second fixed seat 20. Of course, the present invention is not limited to this, and the support member 21 may also be arranged parallel to the axial direction from the second bearing seat 22 toward the second fixed seat 20.

[0039] Typically, to secure the bearing 3 in the shaft system and prevent it from detaching or moving axially, the shaft system includes a bearing retaining portion located at the first end of the second shaft 2. This bearing retaining portion can be, for example, a bearing inner ring end cap 5 to limit the inner ring of the bearing 3. To fix the support portion 10 to the shaft end face of the first end of the second shaft 2, the second fixing seat 20 of the support portion 10 can be connected to the bearing inner ring end cap 5, thereby connecting to the first end of the second shaft 2. However, the present invention is not limited to this. The structure of the second fixing seat 20 can be modified so that it can not only connect to the first end of the second shaft 2 but also prevent the bearing 3 from detaching. The second fixing seat 20 can be directly fixed to the shaft end face of the first end of the second shaft 2, thus eliminating the need for the bearing inner ring end cap 5. The second fixing seat 20 only needs to have a bearing retaining portion that protrudes radially along the shaft system to prevent the bearing 3 from detaching.

[0040] like Figures 1 to 6 As shown in the exemplary embodiment, the support member 21 may be configured as a cylindrical member. For example, the support member 21 may be configured as a hollow cone to facilitate manufacturing. In this case, the second fixing seat 20, the support member 21, and the second bearing seat 22 may be integrally formed. However, the invention is not limited thereto, and the support member 21 may also be configured as rod-shaped members spaced apart along the circumferential direction of the support portion 10.

[0041] The load-bearing bearing 11 may include an inner ring and an outer ring, and rolling elements disposed between the inner ring and the outer ring. (Refer to this application) Figure 1 and Figure 2 One of the inner and outer rings is connected to the connecting assembly 17, and the other of the inner and outer rings is connected to the support portion 10. Optionally, the load-bearing bearing 11 mainly bears axial force, such as, but not limited to, a thrust bearing, or the load-bearing bearing 11 can bear both axial and radial forces, such as, but not limited to, an angular contact ball bearing. Since the load-bearing bearing 11 is housed in a relatively simple support device, if the load-bearing bearing 11 fails or reaches its fatigue life, a spare load-bearing bearing 11 can be easily replaced without having to disassemble the entire shaft system as required by bearing 3 in the shaft system. This saves replacement time and costs, and improves production efficiency.

[0042] like Figure 1 As shown, the shaft end support 8 may include a connecting end cap 23 and a mounting seat 24 connected to the outer periphery of the connecting end cap 23. The connecting end cap 23 includes a shaft end top plate 25 and a cylindrical body 26 extending from the shaft end top plate 25 along the axial direction of the shaft system toward the second end of the shaft system. The mounting seat 24 is formed on the outer periphery of the cylindrical body 26. In the radial direction of the shaft system, the inner diameter of the cylindrical body 26 is larger than the outer contour dimension of the first end of the support portion 10. The cylindrical body 26 is sleeved on the first end of the support portion 10. The bearing 11 is disposed between the inner side of the cylindrical body 26 and the outer side of the first end of the support portion 10. The cylindrical body 26 may be in the shape of a flared mouth with a diameter that increases from the shaft end top plate 25 along the axial direction of the shaft system toward the second end of the shaft system. The mounting seat 24 may be configured as a leg extending outward from the outer periphery of the cylindrical body 26.

[0043] The connecting assembly 17 may include: a fixing seat 6 for fixing to the shaft end face of the first end of the first shaft 1; and a connecting portion 7 connected between the fixing seat 6 and the mounting seat 24 of the shaft end support 8, wherein the connecting portion 7 is inclined or parallel to the fixing seat 6 from the shaft end support 8. For example, in order to increase the bearing area of ​​axial load and reduce the bearing capacity of the connecting portion 7, the connecting portion 7 may be gradually widened axially from the shaft end support 8 towards the fixing seat 6.

[0044] Normally, to secure the bearing 3 in the shaft system and prevent it from detaching or moving axially, the shaft system includes a bearing outer ring end cap 4 located at the first end of the first shaft 1 to limit the bearing outer ring of the bearing 3. The fixing seat 6 can be fixed to the first end of the first shaft 1 by connecting to the bearing outer ring end cap 4. However, the present invention is not limited to this. The structure of the fixing seat 6 can be modified so that it can not only connect between the first end of the first shaft 1 and the connecting part 7, but also axially position the bearing 3 and prevent it from detaching. In this way, the bearing outer ring end cap 4 can be omitted, and the fixing seat 6 can be directly fixed to the shaft end face of the first end of the first shaft 1, as long as the fixing seat 6 is constructed with a portion that protrudes radially along the shaft system to axially position the bearing 3 and prevent it from detaching.

[0045] The connecting portion 7 consists of rod-shaped members spaced apart along the circumference of the support portion 10. These rod-shaped members are hinged to the fixing seat 6, allowing for more flexible and convenient installation and removal of both the rod-shaped members and the fixing seat 6. For example, the rod-shaped members can be hinged to the fixing seat 6 first, and then connected to the mounting seat 24 of the shaft end support 8; alternatively, the rod-shaped members can be first installed on the mounting seat 24 of the shaft end support 8, and then connected to the fixing seat 6. There can be multiple rod-shaped members, for example, three or more. These multiple rod-shaped members can be evenly distributed along the circumference of the support portion 10 at predetermined intervals to jointly bear the axial load. As an example, such as... Figures 1 to 3 As shown, the number of rod-shaped members can be set to four, with adjacent rod-shaped members spaced apart at 90-degree angles. In this case, four fixing seats 6 can be correspondingly set, with adjacent fixing seats also arranged at 90-degree angles. However, the embodiment of fixing seats 6 is not limited to this. The fixing seats 6 can also be arranged continuously in a circular shape. To facilitate the installation of the rod-shaped members, the fixing seats 6 and the mounting seats 24 can be arranged to correspond to the number of rod-shaped members.

[0046] In this exemplary embodiment, adjustable axial prestress can be provided by adjusting the preload of the preload member 13. The preload member 13 can be configured as a nut, with an external thread at the first end of the rod-shaped member, and a through hole on the mounting base 24 of the shaft end support 8. The first end of the rod-shaped member passes through the through hole and is threadedly connected to the nut. Thus, the magnitude of the axial prestress can be adjusted by adjusting the amount of thread engagement between the nut and the first end of the rod-shaped member. After the support device is installed, a preload load is generated by preloading the nut with a torque wrench. Different preload loads can be achieved by controlling the torque of the torque wrench.

[0047] In order to increase the contact surface, prevent loosening, and distribute pressure to protect the parts, a gasket 12 may also be provided between the nut of the preload 13 and the connecting surface of the shaft end support 8.

[0048] To ensure a uniform preload transmitted to the bearing 11, the support device may also include a spring 9. The spring 9 is axially positioned between the bearing 11 and the axial end face of the shaft end support 8 facing the bearing 11, and contacts the axial end face of the shaft end support 8. The spring 9 is embedded inside the bearing 11. Preferably, the spring 9 can be a disc spring to ensure a more uniform preload transmitted to the bearing 11. However, the form of the spring 9 is not limited to a disc spring; any spring that effectively ensures a more uniform preload transmitted to the bearing 11 is acceptable.

[0049] Figures 4 to 6 A support device for a shaft system according to another exemplary embodiment of the present invention is shown. In this exemplary embodiment, the structures of the connecting assembly, shaft end support, and preload differ from those described above. Figures 1 to 3 Apart from the connecting assembly, shaft end support, and preload of the support device shown, the structures of the remaining components are identical or similar. Therefore, for the sake of brevity and clarity, detailed descriptions of the structures of identical or similar components will be omitted below.

[0050] like Figures 4 to 6 As shown, in another exemplary embodiment of the present invention, the connecting component 14 is a cylindrical member, a first bearing seat 19 is provided at the first end of the cylindrical member along the axial direction, a bearing 11 is disposed radially between the radial inner side wall of the first bearing seat 19 and the radial outer side wall of the support portion 10, and a first fixing seat 18 is provided at the second end of the cylindrical member along the axial direction to be connected to the shaft end face of the first end of the first shaft 1.

[0051] When the connecting assembly 14 is configured as a cylindrical member, the shaft end support 15 can be configured as an annular plate, which is connected to the axial end face of the first bearing seat 19.

[0052] In this exemplary embodiment, one of the inner ring and the outer ring of the bearing 11 is connected to the shaft end support 15, and the other of the inner ring and the outer ring is connected to the support portion 10.

[0053] The preload 16 can be a bolt. A first threaded hole and a second threaded hole extending axially are formed in the shaft end support 15 and the first bearing housing 19, respectively. The bolt is sequentially threaded into the first threaded hole and the second threaded hole. Here, the magnitude of the axial preload load can be adjusted by adjusting the amount of thread engagement between the bolt and the first bearing housing 19. However, embodiments of the preload 16 are not limited to this; the preload 16 can also be implemented as a preload assembly that uses a component with external threads (such as a screw) and a nut for cooperation, as long as it can provide an axial preload.

[0054] According to another exemplary embodiment of the present invention, a wind turbine generator set is also provided, comprising: a generator, including a shaft system, the shaft system including a first shaft 1, a second shaft 2, and a bearing 3, the first shaft 1 being sleeved on the outer periphery of the second shaft 2, and the bearing 3 being radially disposed between the first shaft 1 and the second shaft 2, such that the first shaft 1 can rotate relative to the second shaft 2 via the bearing 3. Wherein, the first shaft 1, the second shaft 2, and the bearing 3 are coaxially arranged; here, the first shaft 1 may be referred to as the moving shaft, the second shaft 2 as the fixed shaft, and the bearing 3 generally as the main bearing.

[0055] Reference Figure 7 The main bearing is a double-row roller bearing. Specifically, the main bearing can be a double-row tapered roller bearing, a double-row self-aligning roller bearing, or other bearings capable of withstanding radial loads.

[0056] After the main bearing is assembled into the shaft system, a clearance is usually provided. This clearance serves to allow space for the thermal expansion of the inner ring, outer ring, and rolling elements of the main bearing, and to preserve the lubricating oil film. When the inner or outer ring of the main bearing is subjected to axial load, the double-row rollers exhibit uneven load distribution, meaning one row of rollers bears a heavier load than the other. For example... Figure 7 As shown, A1B1 and A2B2 are the radial clearances of the front and rear roller raceways, respectively, and B1C1 and B2C2 are the axial clearances of the front and rear roller raceways, respectively. When the outer ring raceway of the main bearing is subjected to an axial force Fx, the axial clearance of the front raceway decreases, while the axial clearance of the rear raceway increases; that is, B1C1 decreases, and B2C2 increases. This results in the front roller raceway bearing a greater load than the rear roller raceway, making the front rollers more prone to failure and thus affecting the fatigue life of the entire main bearing.

[0057] To address the aforementioned technical problems, this invention provides a wind turbine generator set comprising the aforementioned generator and support device. The support device according to the invention is installed at the first axial end of the generator's shaft system. When the inner raceway of the main bearing bears the axial load of the support device, the axial force Fx can be directly transmitted to the fixed shaft without having to pass through the main bearing. This effectively eliminates the axial wind load on the main bearing or reduces it to a smaller axial load. For double-row roller bearings, this eliminates the uneven load distribution between the two rows of rollers, resulting in more uniform load distribution between the front and rear rows, thereby improving the fatigue life of the main bearing.

[0058] Furthermore, for in-service units, the main bearings have already been in operation for a certain number of years, and the wear of the front rollers will be greater than that of the rear rollers. The support device can be adjusted to generate axial prestress load after installation, thereby causing the rear rollers of the main bearing to bear a greater load. This reduces the wear of the front rollers, improves the overall fatigue life of the main bearing, and allows the main bearing's service life to exceed its design life.

[0059] In addition, compared with replacing the main bearing, installing support devices on in-service wind turbine generators not only saves time but also reduces costs.

[0060] The shaft support device of the present invention can prevent axial loads from acting directly on the bearings of the shaft system or reduce the axial loads acting on the bearings of the shaft system, thereby improving the fatigue life of the bearings of the shaft system. Wind turbine generator sets including the above-mentioned support device can improve the fatigue life of the generator by increasing the fatigue life of the main bearings.

[0061] Although the invention has been specifically shown and described with reference to exemplary embodiments thereof, those skilled in the art should understand that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the claims.

Claims

1. A support device for a shaft system, the shaft system comprising a first shaft (1), a second shaft (2), and a bearing (3) disposed between the first shaft (1) and the second shaft (2), the first shaft (1) being sleeved on the outer periphery of the second shaft (2) and rotatable relative to the second shaft (2) via the bearing (3), characterized in that, The support device is used to be disposed at a first end in the axial direction of the shaft system, and the support device includes: Shaft end support (8, 15), at least a portion of which is rotatably supported in the axial direction on the outside of the shaft end face of the first end of the second shaft (2); A connecting assembly (17, 14) is provided axially in the shaft system for connecting between the first end of the first shaft (1) and the shaft end support (8, 15). Preload members (13, 16) adjustably connect the connecting assembly (17, 14) and the shaft end support (8, 15) and are used to apply axial preload to the shaft system.

2. The support device for a shaft system according to claim 1, characterized in that, The support device also includes: Support (10), the first end of the support (10) is axially oriented toward the shaft end support (8, 15), and the second end of the support (10) is fixedly connected to the shaft end face of the first end of the second shaft (2); A bearing (11) is disposed at the first end of the support (10) and is located on the outside of the support (10) in the radial direction of the shaft system. The shaft end support (8, 15) is supported on the support (10) by the bearing (11) and is rotatable relative to the support (10) by the bearing (11).

3. The support device for a shaft system according to claim 2, characterized in that, The shaft end support (8) includes a connecting end cap (23) and a mounting seat (24) connected to the outer periphery of the connecting end cap (23). The connecting end cap (23) includes a shaft end top plate (25) and a cylindrical body (26) extending from the shaft end top plate (25) along the axial direction of the shaft system toward the second end of the shaft system. The mounting seat (24) is formed on the outer periphery of the cylindrical body (26). In the radial direction of the shaft system, the inner diameter of the cylindrical body (26) is larger than the outer contour dimension of the first end of the support (10). The cylindrical body (26) is sleeved on the first end of the support (10). The bearing (11) is disposed between the inner side of the cylindrical body (26) and the outer side of the first end of the support (10).

4. The support device for a shaft system according to claim 3, characterized in that, The connection component (17) includes: Fixing seat (6), the fixing seat (6) is used to fix the shaft end face of the first end connected to the first shaft (1); A connecting part (7) is connected between the fixed base (6) and the mounting base (24).

5. The support device for a shaft system according to claim 4, characterized in that, The connecting part (7) is a rod-shaped member that is spaced apart along the circumferential direction of the support part (10), and the rod-shaped member is hinged to the fixing seat (6).

6. The support device for a shaft system according to claim 5, characterized in that, The number of rod-shaped members is two or more, and the number of the fixing base (6) and the mounting base (24) corresponds to the number of the rod-shaped members.

7. The support device for a shaft system according to claim 5, characterized in that, The cylinder (26) is in the shape of a flared mouth with a diameter that increases from the top plate (25) of the shaft end along the axial direction of the shaft system toward the second end of the shaft system, and the mounting base (24) is a support leg that extends outward from the outer periphery of the cylinder (26).

8. The support device for a shaft system according to claim 5, characterized in that, The preload (13) is a nut, the first end of the rod-shaped member is provided with an external thread, the mounting base (24) is provided with a through hole, and the first end of the rod-shaped member passes through the through hole and is threadedly connected to the nut.

9. The support device for a shaft system according to claim 2, characterized in that, The connecting component (14) is a cylindrical member. The first end of the cylindrical member along the axial direction is provided with a first bearing seat (19). The bearing (11) is arranged radially between the inner radial sidewall of the first bearing seat (19) and the outer radial sidewall of the support (10). The second end of the cylindrical member along the axial direction is provided with a first fixing seat (18) to be connected to the shaft end face of the first end of the first shaft (1). The shaft end support (15) is an annular plate, which is connected to the axial end face of the first bearing seat (19).

10. The support device for a shaft system according to claim 9, characterized in that, The preload (16) is a bolt. The shaft end support (15) and the first bearing seat (19) are respectively formed with a first threaded hole and a second threaded hole extending along the axial direction. The bolt is sequentially threaded to the first threaded hole and the second threaded hole.

11. The support device for a shaft system according to claim 2, characterized in that, The support (10) includes a second fixed seat (20), a support member (21), and a second bearing seat (22) along the axial direction. The second fixed seat (20) is fixedly connected to the shaft end face of the first end of the second shaft (2). The bearing (11) is disposed along the radial direction between the radial inner wall of the connecting assembly (17) and the radial outer wall of the second bearing seat (22).

12. The support device for a shaft system according to claim 11, characterized in that, The support member (21) is inclined from the second bearing seat (22) toward the second fixed seat (20).

13. The support device for a shaft system according to claim 11, characterized in that, The support member (21) is a rod-shaped member that is spaced apart along the circumferential direction of the support part (10); or the support member (21) is a cylindrical member.

14. The support device for a shaft system according to any one of claims 2-13, characterized in that, The support device further includes a spring (9), which is disposed along the axial direction between the bearing (11) and the shaft end support (8, 15) and contacts the axial inner end face of the shaft end support (8, 15).

15. A wind turbine generator set, characterized in that, The wind turbine generator set includes: Support device for shaft system as described in any one of claims 1-14; A generator, including the aforementioned shaft system.

16. The wind turbine generator set as described in claim 15, characterized in that, The bearing (3) is a double-row roller bearing.

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