Adjustment method for shaft structure of main bearing in transmission chain

Abstract

This invention relates to the transmission chain structure of wind turbine generators, and discloses a shaft system structure for the main bearing of the transmission chain. The structure includes a main bearing with an interference fit to the main shaft, a bearing housing with an interference fit to the outer ring of the main bearing, and a split connecting ring connected to the flange end face of the bearing housing. The split connecting ring includes a lower connecting ring and an upper connecting ring. The upper connecting ring is made of transparent material, cast, or forged, and the lower connecting ring is also made of casting or forging. A preload end cap abuts against the end face of the main bearing. The preload end cap is composed of at least three arc segments with equal circumferences on their outer end faces, and each arc segment is connected to the end face of the main shaft via bolts. This allows the stop of the preload end cap to axially press against the inner ring of the main bearing, achieving axial preload of the main bearing. The shaft system structure of the main bearing of this invention is simple, better ensures reliable operation of the main bearing, and significantly reduces the operation and maintenance costs of the generator set.

Description

Technical Field

[0001] This invention relates to the transmission chain structure of wind turbine generators, and more specifically, to a method for debugging the shaft system structure of the main bearing of the transmission chain. Background Technology

[0002] With the continuous development of the wind power industry, the layout of the wind turbine transmission system and the connection between the gearbox and the shaft system are constantly changing.

[0003] Currently, the arrangement of main bearings in shaft systems tends towards a configuration of single-row tapered roller bearings (TRB) + single-row tapered roller bearings (TRB). The connection between the shaft system and gearbox is trending towards an integrated structure, where the bearing housing is connected to the gearbox's primary gear ring, and the main shaft is connected to the gearbox's primary planetary carrier. For the TRB main bearing arrangement, the preload control of the main bearings is crucial. In this integrated connection method between the gearbox and shaft system, the bearing preload end cap is enclosed within the internal cavity of the transmission system. If insufficient bearing preload requires adjustment, or if the preload end cap bolts loosen, timely maintenance on the already installed wind turbine equipment is impossible, leading to bearing slippage, misalignment, and failure. Furthermore, because the main bearing lubrication method is oil injection lubrication, the oil injection points are enclosed within the internal cavity, making it impossible to visually inspect the internal oil injection lubrication process.

[0004] In view of this, there is a need to provide a shaft system structure in which the preload of the main bearing of the transmission chain can be maintained, so as to solve or overcome the above-mentioned technical problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for debugging the shaft structure of the main bearing of the transmission chain. This debugging method can meet the main bearing lubrication test before the shaft structure is installed and is easy to operate.

[0006] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0007] A shaft system structure for a transmission chain main bearing includes a main bearing that is interference-fitted with the main shaft, a bearing housing that is interference-fitted with the outer ring of the main bearing, and a split connecting ring that is connected to the flange end face of the bearing housing. The split connecting ring includes a lower connecting ring and an upper connecting ring. The upper connecting ring may be made of a transparent material or formed by casting or forging. The lower connecting ring is formed by casting or forging. The main bearing preload end cap is formed by splicing together at least three arc segments with equal circumferences on their outer end faces, and each arc segment is connected to the end face of the main shaft.

[0008] Preferably, the lower connecting ring includes a lower connecting ring body, with first arc-shaped flanges at both ends in the axial direction and first transverse flanges at both ends in the radial direction, and connecting holes provided on both the first arc-shaped flanges and the first transverse flanges; and / or, the upper connecting ring includes an upper connecting ring body, with second arc-shaped flanges at both ends in the axial direction and second transverse flanges at both ends in the radial direction, and connecting holes provided on both the second arc-shaped flanges and the second transverse flanges.

[0009] Preferably, a sealing groove is provided on the surface of the second transverse flange opposite to the first transverse flange, and a sealing strip is provided in each of the sealing grooves.

[0010] Preferably, the outer circumferential surfaces of the connecting lower ring body and the connecting upper ring body are further provided with lifting bosses, and each of the lifting bosses is provided with a lifting hole.

[0011] Preferably, the main bearing preload end cover is further provided with a displacement sensing device.

[0012] Preferably, an end cap gap (16) is provided between the arc segments of two adjacent main bearing preload end caps.

[0013] Preferably, the end of the split connecting ring furthest from the bearing housing is connected to the first-stage gear ring of the gearbox.

[0014] Preferably, a second sealing structure is provided between the split connecting ring and the bearing seat.

[0015] In addition, the present invention also proposes a method for debugging the shaft system structure of the main bearing of the transmission chain, applicable to the shaft system structure of the main bearing of the transmission chain as described in any of the above technical solutions, comprising the following steps:

[0016] Step S01: Install and connect the upper connecting ring, lower connecting ring, main shaft, main bearing, bearing housing, gearbox first-stage gear ring, and gearbox first-stage planetary carrier, selecting an upper connecting ring made of transparent material;

[0017] Step S02: Perform an oil injection lubrication test and rotate the main shaft to observe the lubrication of the main bearing through the transparent connecting ring;

[0018] Step S03: After the oil spraying and lubrication test is completed, replace the upper connecting ring made of transparent material with the upper connecting ring made of casting or forging.

[0019] Through the above technical solution, the shaft system structure of the transmission chain main bearing of the present invention includes a main bearing that is interference-fitted with the main shaft, a bearing housing that is interference-fitted with the outer ring of the main bearing, and a split connecting ring that is connected to the flange end face of the bearing housing. The split connecting ring includes a lower connecting ring and an upper connecting ring, with the lower connecting ring located below and the upper connecting ring located above. The upper connecting ring is made of transparent material, cast or forged, and the lower connecting ring is made of cast or forged. A main bearing preload end cap is abutted against the end face of the main bearing. The preload end cap is connected to the end face of the main bearing by a bolt pair, which allows the stop of the preload end cap to press against the inner ring of the main bearing, thereby achieving axial preload of the main bearing. At the same time, the main bearing preload end cap is spliced ​​together by at least three arc segments with equal circumferences on the outer end faces, and each arc segment is connected to the end face of the main shaft by a bolt pair. The shaft system structure of the main bearing of the transmission chain of the present invention can meet the visibility requirements of lubrication testing of the main bearing in the unit workshop and the pre-tightening maintenance requirements of the main bearing after it is launched. The pre-tightening maintenance of the main bearing can be carried out when the unit is in the air. The shaft system and gearbox do not need to be brought down from the tower, which can ensure more reliable operation of the main bearing and reduce the unit maintenance cost.

[0020] Other advantages of the present invention and the technical effects of preferred embodiments will be further described in the following detailed description. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a specific embodiment of the shaft system structure of the main bearing of the transmission chain described in this invention;

[0022] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0023] Figure 3 This is a three-dimensional structural schematic diagram of one specific embodiment of the shaft system structure of the main bearing of the transmission chain described in this invention;

[0024] Figure 4 yes Figure 3 A magnified view of a portion of the image;

[0025] Figure 5 This is a second three-dimensional structural schematic diagram of a specific embodiment of the shaft system structure of the main bearing of the transmission chain described in this invention;

[0026] Figure 6 This is a schematic diagram of a specific embodiment of the shaft system structure of the main bearing of the transmission chain described in this invention;

[0027] Figure 7 yes Figure 6 A magnified view of a portion of the image;

[0028] Figure 8This is a flowchart illustrating the debugging method for the shaft system structure of the main bearing of the transmission chain described in this invention.

[0029] Figure 9 This is a flowchart illustrating the pre-tightening maintenance method for the shaft system structure of the main bearing of the transmission chain described in this invention.

[0030] Explanation of reference numerals in the attached figures

[0031] 1. Connect the lower ring 101. Connect the lower ring body

[0032] 102 First arc flange 103 First transverse flange

[0033] 2 spindles 3 main bearings

[0034] 4. Bearing housing; 5. Bearing housing connecting bolt pair

[0035] 6 Connecting the upper ring 601 Connecting the upper ring body

[0036] 602 Second Arc Flange; 603 Second Transverse Flange

[0037] 604 lifting boss 7-tooth ring connecting bolt pair

[0038] 8. Gearbox, first stage ring gear; 9. Gearbox, first stage planetary carrier

[0039] 10 O-ring seal; 11 Main bearing preload end cap

[0040] 1101 End cover lifting hole 12 Bearing preload end cover connecting bolt pair

[0041] 13 O-ring seal 14 Connecting ring connecting bolt pair

[0042] 15 Sealing strip 16 End cap gap Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0044] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features.

[0046] like Figures 1 to 7 As shown, the present invention provides a shaft system structure for a transmission chain main bearing, including a main bearing 3 that is interference-fitted with a main shaft 2, a bearing housing 4 that is interference-fitted with the outer ring of the main bearing 3, and a split connecting ring that is connected to the flange end face of the bearing housing 4. The split connecting ring includes a lower connecting ring 1 and an upper connecting ring 6. The upper connecting ring 6 may be made of transparent material or formed by casting or forging. The lower connecting ring 1 is formed by casting or forging. The main bearing preload end cap 11 is spliced ​​together by at least three arc segments with equal circumferences on the outer end faces, and each arc segment is connected to the end face of the main shaft 2.

[0047] In this invention, the inner ring of the main bearing 3 is interference-fitted with the main shaft 2, and the outer ring of the main bearing 3 is interference-fitted with the bearing housing 4. The main bearing preload end cap 11 abuts against the end face of the inner ring of the main bearing 3 and is connected to the end of the main shaft 2 through the bearing preload end cap connecting bolt pair 12. The bearing preload end cap connecting bolt pair 12 allows the stop of the main bearing preload end cap 11 to press against the inner ring of the main bearing 3, thereby achieving axial preload on the main bearing 3. The bearing housing 4 is connected to the split connecting ring through the bearing housing connecting bolt pair 5. The other end of the split connecting ring is connected to the first-stage gear ring 8 of the gearbox through the gear ring connecting bolt pair 7. The first-stage planetary carrier 9 of the gearbox abuts against the end of the main shaft 2. The first-stage planetary carrier 9 of the gearbox and the main shaft 2 are connected by bolt pairs, and an O-ring seal 13 is provided between the gearbox planetary carrier 9 and the main shaft 2. This constitutes the main structure of the shaft system of the transmission chain main bearing of this invention.

[0048] Therefore, in the above basic structure, the split connecting ring includes a lower connecting ring 1 and an upper connecting ring 6. The lower connecting ring 1 and the upper connecting ring 6 are connected by connecting ring connecting bolt pairs 14, and both the lower connecting ring 1 and the upper connecting ring 6 are connected to the bearing housing 4 by bearing housing connecting bolt pairs 5. Meanwhile, the main bearing preload end cover 11 is composed of at least three arc segments with equal outer end face circumferences spliced ​​together. That is, the main bearing preload end cover 11 is composed of at least three congruent arc segments, so that the main bearing preload end cover 11 can be moved to a suitable position and disassembled and installed by rotating the main shaft 2. The arc segment splicing structure can improve the utilization rate of workshop scrap materials and reduce production costs. Each arc-shaped end cover is also provided with a lifting hole for lifting, disassembly, and maintenance.

[0049] During the manufacturing process, the split connecting ring at the 12 o'clock position (i.e., the upper connecting ring 6) can be made of a transparent material, such as acrylic, or it can be formed by casting or forging, depending on the actual usage requirements. Specifically, after the shaft system structure of the main bearing 3 of the transmission chain of the present invention is assembled in the workshop or on the test bench, when it is necessary to observe the oil lubrication of the main bearing 3, since the upper connecting ring 6 is installed in the upper part, the upper connecting ring 6 can be made of transparent acrylic. This not only completes the structural installation but also allows observation of the usage of each component and the lubrication of the main bearing 3 during the test, ensuring the reliable operation of the main bearing.

[0050] Furthermore, when the shaft system structure of the transmission chain main bearing of the present invention needs to be installed on a fan, the upper connecting ring 6 made of transparent material can be replaced with an upper connecting ring 6 made of casting or forging. Since the two ends of the lower connecting ring 1 are connected to the bearing housing 4 and the gearbox primary gear ring 8 respectively, after the upper connecting ring 6 is disassembled, the bearing preload end cover connecting bolt assembly 12 can be inspected and the main bearing preload end cover 11 can be replaced without changing the relative positions of the components.

[0051] During unit operation, if the bearing preload end cover connecting bolt assembly 12 becomes loose, or if it is necessary to adjust the preload of the main bearing 3 or replace the preload end cover, maintenance personnel do not need to completely disassemble the gearbox and shaft system, nor do they need to remove the gearbox from the tower. They only need to remove the upper connecting ring 6 located above and rotate the main shaft 2, thereby greatly reducing maintenance costs. Specifically, as follows: Figures 3 to 5 As shown, rotating the main shaft 2 rotates the arc segment of the main bearing preload end cover 11 that needs maintenance to a suitable position, and maintains the bearing preload end cover connecting bolt assembly 12. Then, rotating the main shaft 2 again sequentially rotates the remaining arc segment end covers to suitable positions and maintains their bearing preload end cover connecting bolt assemblies 12. If it is necessary to adjust the preload of the main bearing 3 and replace the main bearing preload end cover 11, the main shaft 2 can be rotated to rotate each arc segment of the main bearing preload end cover 11 that needs to be disassembled to a suitable position, and the new main bearing preload end cover 11 arc segments can be disassembled and installed sequentially. It should be noted that the number of parts of the split connecting ring of the present invention must be less than the number of arc segments of the main bearing preload end cover 11. That is, the number of parts of the split connecting ring is two, and the number of arc segments of the main bearing preload end cover 11 is at least three, but can also be four, or even more. In this way, when removing a smaller number of arc segments of the main bearing preload end cover 11, the disassembled arc segments can be easily removed. If the number of the main bearing preload end cap 11 and the split connecting ring is set to other relationships, the effect of the present invention may not be achieved.

[0052] In a preferred embodiment of the present invention, the lower connecting ring 1 includes a lower connecting ring body 101. The lower connecting ring body 101 has a first arc-shaped flange 102 at both ends in the axial direction and a first transverse flange 103 at both ends in the radial direction. Both the first arc-shaped flange 102 and the first transverse flange 103 have connecting holes.

[0053] In a preferred embodiment of the present invention, the connecting ring 6 includes a connecting ring body 601. The connecting ring body 601 has a second arc-shaped flange 602 at both ends in the axial direction and a second transverse flange 603 at both ends in the radial direction. Both the second arc-shaped flange 602 and the second transverse flange 603 have connecting holes.

[0054] In one specific embodiment of the present invention, such as Figure 5 As shown, the lower ring 1 is provided with a first arc-shaped flange 102 at both ends in the axial direction, and the upper ring 6 is provided with a second arc-shaped flange 602 at both ends in the axial direction. The outer diameters of the first arc-shaped flange 102 and the second arc-shaped flange 602 are equal, so that when the lower ring 1 and the upper ring 6 are connected to form a split connecting ring, the flanges at both ends of the split connecting ring basically overlap.

[0055] Furthermore, the flange on the bearing housing that connects to the split connecting ring directly increases the wall thickness at the outer ring mounting location of the main bearing 3, mitigating the increased weight of the bearing housing 4 caused by the increased wall thickness requirement for the main bearing 3. Meanwhile, the mounting location of the inner ring of the main bearing 3 on the main shaft, which connects to the first-stage planetary carrier 9 of the gearbox, has a thicker wall at the mating point between the main shaft and the bearing's inner ring. The flange on the bearing housing 4 that connects to the split connecting ring effectively ensures the uniformity of wall thickness at the mounting locations of the inner and outer rings of the main bearing 3. This results in better stiffness matching between the inner and outer rings under stress, smaller shaft deformation, more reliable gearbox gear meshing, and effectively improved reliability of the entire transmission chain.

[0056] In a preferred embodiment of the present invention, a sealing groove is provided on the surface of the second transverse flange edge 603 opposite to the first transverse flange edge 103, and a sealing strip 15 is provided in each of the sealing grooves.

[0057] In one specific embodiment of the present invention, the sealing grooves are arranged parallel and at equal intervals on the second transverse flange edge 603, and the sealing strip is arranged in the sealing groove to achieve the sealing of the end face connection between the lower ring 1 and the upper ring 6, and to prevent the leakage of lubricating oil in the gearbox and shaft cavity.

[0058] In a preferred embodiment of the present invention, the outer peripheral surfaces of the connecting lower ring body 101 and the connecting upper ring body 601 are further provided with lifting bosses 604, and each lifting boss 604 is provided with a lifting hole.

[0059] In one specific embodiment of the present invention, such as Figure 5 As shown, according to the hoisting requirements, hoisting bosses 604 are symmetrically arranged on the outer peripheral surface of the lower ring body 101, and hoisting bosses 604 are also symmetrically arranged on the outer peripheral surface of the upper ring body 601. Preferably, each hoisting boss 604 is provided with a hoisting hole.

[0060] In a preferred embodiment of the present invention, the main bearing preload end cover 11 is further provided with a displacement sensing device.

[0061] In one specific embodiment of the present invention, by providing a displacement sensing device on the preload end cover 11 of the main bearing, the axial and radial movements of the main bearing preload end cover 11 can be monitored in real time after the shaft structure of the transmission chain main bearing of the present invention is installed on the wind turbine.

[0062] In a preferred embodiment of the present invention, an end cover gap 16 is provided between the arc segments of two adjacent main bearing preload end covers 11.

[0063] In one specific embodiment of the present invention, such as Figure 7 As shown, an end cap gap 16 is provided between the ends of the two arc segments to prevent difficulties in circumferential installation or failure to install due to processing and dimensional tolerances.

[0064] In a preferred embodiment of the present invention, the end of the split connecting ring away from the bearing seat 4 is connected to the first-stage gear ring 8 of the gearbox.

[0065] In a preferred embodiment of the present invention, an O-ring seal 10 is further provided between the split connecting ring and the bearing seat 4.

[0066] As an optimal embodiment of the shaft system structure of the transmission chain main bearing of the present invention, it includes a main shaft 2, a main bearing 3, a bearing housing 4, a split connecting ring, a first-stage gear ring 8 of the gearbox, a first-stage planetary carrier 9 of the gearbox, and a main bearing preload end cap 11. The inner ring of the main bearing 3 is interference-fitted to the outer diameter surface of the main shaft 2, and the outer ring of the main bearing 3 is interference-fitted to the inner hole of the bearing housing 4. The main bearing preload end cap 11 is connected to the main shaft 2 via a bearing preload end cap connecting bolt pair 12, and the main bearing preload end cap 11 abuts against the end face of the inner ring of the main bearing 3. The bearing housing 4 is connected to the split connecting ring via a bearing housing connecting bolt pair 5. An O-ring seal 10 is provided on the connecting end face of the bearing housing 4 and the split connecting ring. The other end of the split connecting ring is connected to the first-stage gear ring 8 of the gearbox via a gear ring connecting bolt pair 7. The gearbox planetary carrier 9 abuts against the end of the main shaft 2, and the gearbox planetary carrier 9 and the main shaft 2 are connected via the bearing preload end cap connecting bolt pair 12. The split connecting ring includes a lower connecting ring 1 and an upper connecting ring 6. The upper connecting ring 6 is made of transparent material, cast, or forged. The lower connecting ring 1 is made of casting or forging. The lower connecting ring 1 includes a lower connecting ring body 101, first arc-shaped flanges 102 located at both ends of the lower connecting ring body 101 in the axial direction, and first transverse flanges 103 located at both ends of the lower connecting ring body 101 in the radial direction. Both the first arc-shaped flanges 102 and the first transverse flanges 103 are provided with connecting holes. The upper connecting ring 6 includes a upper connecting ring body 601, second arc-shaped flanges 602 located at both ends of the upper connecting ring body 601 in the axial direction, and second transverse flanges 603 located at both ends of the upper connecting ring body 601 in the radial direction. Both the second arc-shaped flanges 602 and the second transverse flanges 603 are provided with connecting holes. The first transverse flange 103 is provided with a sealing groove, and a sealing strip 15 is provided in the sealing groove. The lower connecting ring 1 and the upper connecting ring 6 are connected by connecting ring connecting bolt pairs 14. The main bearing preload end cover 11 is composed of at least three congruent arc segments spliced ​​together, and an end cover gap 16 is provided between the arc segments of two adjacent main bearing preload end covers 11. The main bearing preload end cover 11 is also provided with a displacement sensing device.

[0067] Based on the above-described preferred embodiment, it can be seen that the use process of the shaft system structure of the transmission chain main bearing of the present invention is as follows:

[0068] During the testing phase, the connecting ring 6, made of transparent material, can be used to observe the oil spraying lubrication of the main bearing in the workshop or on the test bench.

[0069] During the usage phase, the transparent material-molded upper ring 6, after testing, can be replaced with a commonly used casting or forging-molded upper ring 6, which can then be installed on the wind turbine.

[0070] During unit operation and maintenance, if the bearing preload end cover connecting bolt assembly 12 becomes loose and requires adjustment, or during regular unit maintenance and inspection, the upper connecting ring 6 is first removed. The lower connecting ring 1 is then connected between the bearing housing 4 and the gearbox gear ring 8, ensuring that the installation positions of all components remain unchanged. Simply rotate the main shaft 2 to rotate the arc segment of the main bearing preload end cover 11 that needs adjustment to the upper position sequentially, and perform preload maintenance and adjustment of the bearing preload end cover connecting bolt assembly 12. If the preload force of the main bearing 3 is unsuitable and the main bearing preload end cover 11 needs to be replaced, rotate the main shaft 2 to rotate the arc segment of the main bearing preload end cover 11 to the appropriate position, and then sequentially disassemble and install the new arc segment of the main bearing preload end cover 11.

[0071] It can be seen that this invention can not only achieve testing and observation, but also, when maintaining the bearing preload end cover connecting bolt pair 12 during operation and replacing the new main bearing preload end cover 11, it does not require the gearbox and shaft system to be completely disassembled and separated, nor does it require the shaft system and gearbox to be removed from the tower. The operators only need to remove the connecting ring 6 on the tower to perform various operations on the main bearing 3 and the main bearing preload end cover 11, which effectively reduces the difficulty of operation and greatly reduces the maintenance cost.

[0072] In addition, such as Figure 8 As shown, the present invention also provides a method for debugging the shaft system structure of the main bearing of a transmission chain, applicable to the shaft system structure of the main bearing of the transmission chain as described in any of the above technical solutions, comprising the following steps:

[0073] Step S01: Install and connect the upper connecting ring 6, the lower connecting ring 1, the main shaft 2, the main bearing 3, the bearing seat 4, the first-stage gear ring 8 of the gearbox, and the first-stage planetary carrier 9 of the gearbox, and select the upper connecting ring 6 made of transparent material;

[0074] Step S02: Perform an oil injection lubrication test and rotate the main shaft 2 to observe the lubrication status of the main bearing 3 through the transparent connecting ring 6;

[0075] Step S03: After the oil spraying and lubrication test is completed, replace the upper connecting ring 6 made of transparent material with the upper connecting ring 6 made of casting or forging.

[0076] The shaft system structure debugging method of the transmission chain main bearing of the present invention is used in the shaft system structure debugging stage, and can realize the lubrication test and observation of the main bearing during the assembly stage. Specifically, after the assembly of each component, a connecting ring 6 made of transparent material is installed to facilitate observation of the lubrication of the main bearing 3 and the installation of other components. After the lubrication test is completed, the connecting ring 6 made of transparent material is removed and replaced with a connecting ring 6 made of casting or forging material, and then the next step of unit installation can be carried out.

[0077] Furthermore, such as Figure 9 As shown, the present invention also provides a pre-tightening maintenance method for the shaft system structure of the main bearing of the transmission chain, applied to the shaft system structure of the main bearing of the transmission chain as described in any of the above technical solutions, comprising the following steps:

[0078] Step S01: After receiving the detection signal from the displacement sensing device, disconnect the upper ring 6.

[0079] Step S02: Rotate the main shaft 2 and rotate one of the arc segments of the main bearing preload end cover 11 to the 12 o'clock position, and remove or adjust the connecting bolt pair 12 between the arc segment and the main shaft;

[0080] Step S03: Repeat step S02, and remove or adjust the connecting bolt pairs 12 between other arc segments and the main shaft in sequence;

[0081] Step S04: Install the connecting ring 6.

[0082] Existing pre-tightening maintenance methods require disassembling the unit for maintenance when the unit is in the air. However, in the pre-tightening maintenance method of the transmission chain main bearing shaft structure of this invention, since the upper connecting ring 6 and the lower connecting ring 1 are separate structures, even when the upper connecting ring 6 is removed, the lower connecting ring 1 remains connected between the bearing housing 4 and the gearbox primary gear ring 8, providing a limiting connection between the two. Therefore, pre-tightening maintenance of the main bearing 3 can be performed directly on the unit without removing the shaft system and gearbox from the tower. At the same time, since all important components are not disassembled, there is no need to recalibrate the installation of each component after pre-tightening maintenance, which can effectively ensure the reliability of the main bearing 3's operation. Moreover, the working process is very simple, reducing the labor intensity of operators and greatly reducing the unit maintenance cost.

[0083] In summary, the present invention can achieve the following two important effects:

[0084] First, the shaft system structure of the present invention enables the pre-tightening and maintainability of the main bearing 3. Once the bolt pair becomes loose or the pre-tightening force needs to be adjusted, it is not necessary to completely disassemble the gearbox and shaft system structure, nor is it necessary to lower the gearbox. Maintenance personnel only need to disassemble the connecting ring 6 and rotate the main shaft 2, which greatly reduces the difficulty of operation and the maintenance cost.

[0085] Secondly, according to the test requirements, the connecting ring 6 is made of transparent acrylic material, which can meet the requirements of real-time observation and testing of the oil spraying lubrication of the main bearing 3 during the test phase.

[0086] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0087] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0088] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for debugging the shaft system structure of a transmission chain main bearing, characterized in that, Includes the following steps: Step S01: Connect the upper ring (6), lower ring (1), main shaft (2), main bearing (3), bearing seat (4), gearbox first-stage gear ring (8), and gearbox first-stage planetary carrier (9), and select the upper ring (6) made of transparent material. Step S02: Perform an oil injection lubrication test and rotate the main shaft (2) to observe the lubrication of the main bearing (3) through the transparent connecting ring (6); Step S03: After the oil injection lubrication test is completed, replace the upper connecting ring (6) formed of transparent material with the upper connecting ring (6) formed of casting or forging; wherein The main shaft (2) is interference-fitted with a main bearing (3), the outer ring of the main bearing (3) is interference-fitted with a bearing housing (4), and the flange end face of the bearing housing (4) is connected to a split connecting ring. The split connecting ring includes a lower connecting ring (1) and an upper connecting ring (6). The lower connecting ring (1) is formed by casting or forging. The main bearing preload end cap (11) is spliced ​​from at least three arc segments with equal circumference on the outer end face, and each arc segment is connected to the end face of the main shaft (2). The lower connecting ring (1) includes a lower connecting ring body (101). The connecting ring (6) has a first arc-shaped flange (102) at both ends in the axial direction and a first transverse flange (103) at both ends in the radial direction. Both the first arc-shaped flange (102) and the first transverse flange (103) have connecting holes. The connecting ring (6) includes a connecting ring body (601). The connecting ring body (601) has a second arc-shaped flange (602) at both ends in the axial direction and a second transverse flange (603) at both ends in the radial direction. Both the second arc-shaped flange (602) and the second transverse flange (603) have connecting holes.

2. The method for debugging the shaft system structure of the main bearing of the transmission chain according to claim 1, characterized in that, The second transverse flange (603) has a sealing groove on the surface opposite to the first transverse flange (103), and each sealing groove is provided with a sealing strip (15).

3. The method for debugging the shaft system structure of the main bearing of the transmission chain according to claim 2, characterized in that, The outer circumferential surfaces of the connecting lower ring body (101) and the connecting upper ring body (601) are also provided with lifting bosses (604), and each lifting boss (604) is provided with a lifting hole.

4. The method for adjusting the shaft system structure of the main bearing of the transmission chain according to any one of claims 1 to 3, characterized in that, The main bearing preload end cap (11) is also equipped with a displacement sensing device.

5. The method for debugging the shaft system structure of the main bearing of the transmission chain according to any one of claims 1 to 3, characterized in that, An end cap gap (16) is provided between the arc segments of two adjacent main bearing preload end caps (11).

6. The method for debugging the shaft system structure of the main bearing of the transmission chain according to any one of claims 1 to 3, characterized in that, The end of the split connecting ring away from the bearing seat (4) is connected to the first gear ring (8) of the gearbox.

7. The method for debugging the shaft system structure of the main bearing of the transmission chain according to any one of claims 1 to 3, characterized in that, A second sealing structure (10) is also provided between the split connecting ring and the bearing seat (4).

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