Large megawatt multi-planet wheel hole rotating frame with positioning structure

Abstract

The utility model discloses a big megawatt level many planetary wheel hole rotary table with positioning structure relates to wind power generation technical field. This big megawatt level many planetary wheel hole rotary table with positioning structure, including sun gear shaft and two gear frames, two gear frames are symmetrically set up up and down, and sun gear positioning subassembly includes two first guide ring, the surface of sun gear shaft is rotatably installed with two first gear limit ring through bearing, and the surface of sun gear shaft is installed with sun gear through the parallel key. When installing, the sun gear shaft is directly guided to be fast in alignment and is worn and is installed to the sun gear shaft hole of two gear frames through the double guide structure formed by the circular truncated cone protruding of the opposite surface middle part of gear frame and first guide ring, and the axial body is effectively avoided to tilt, and the initial installation position precision of sun gear can be guaranteed without additional adjustment, and the high -efficient, stable, long -life operation of entire drive system under the heavy load working condition of big megawatt level is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, and in particular to a large megawatt-class multi-planetary gear hole swivel with a positioning structure. Background Technology

[0002] In high-end industrial fields such as wind power generation, heavy machinery transmission, and new energy equipment, large-megawatt planetary gear transmission systems have become core power transmission components due to their advantages such as high power density, large transmission ratio, and strong load-bearing capacity. The planetary gear carrier, as a key supporting component of this system, directly affects the installation accuracy and operational stability of the planetary gear shaft and sun gear shaft, thus determining the transmission efficiency, service life, and safety and reliability of the entire transmission system.

[0003] Currently, the industry generally adopts single-end positioning or positioning schemes that rely solely on bearing fit: for planetary gear shafts, axial positioning is usually achieved by the fit between the shaft shoulder and the end face of the mounting hole of the carrier, while radial positioning relies on the interference fit between the bearing and the hole wall; for sun gear shafts, one end is fixed by a flange and the other end is supported by a floating bearing, lacking an independent two-way positioning structure.

[0004] During assembly, the gear shaft needs to be aligned with the upper and lower mounting holes of the rotating frame and the inner ring of the bearing simultaneously. Due to the lack of synchronous positioning guidance at both ends, the shaft is prone to tilting and uneven clearance between the shaft and the hole. This not only increases the assembly difficulty and prolongs the working time, but may also cause scratches on the shaft surface or hole wall due to forced installation. After long-term operation, problems such as accelerated bearing wear and increased gear meshing clearance may occur. Therefore, this utility model proposes a novel solution. Utility Model Content

[0005] The purpose of this utility model is to solve at least one of the technical problems existing in the prior art, and to provide a large megawatt-level multi-planetary gear hole carrier with a positioning structure. This can solve the problem that during the assembly process, the gear shaft needs to be aligned with the upper and lower mounting holes of the carrier and the inner ring of the bearing at the same time. Due to the lack of synchronous positioning guidance at both ends, the shaft body is prone to tilting and the hole-shaft mating clearance is uneven. This not only increases the assembly difficulty and prolongs the working time, but may also cause scratches on the shaft surface or hole wall due to forced installation. After long-term operation, the bearing wear is prone to be accelerated and the gear meshing clearance is increased.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a large megawatt-class multi-planetary gear hole carrier with a positioning structure, including a sun gear shaft and two gear carriers, the two gear carriers being arranged symmetrically above and below;

[0007] A sun gear positioning assembly is disposed between two gear carriers. The sun gear positioning assembly includes two first guide rings, which are symmetrically welded and fixed to the surface of the corresponding gear carriers.

[0008] The two gear carriers have a frustum-shaped protrusion in the middle of their opposing surfaces. The two gear carriers have a sun gear shaft hole in the middle of their respective surfaces. The upper and lower ends of the sun gear shaft are rotatably mounted on the inner wall of the corresponding sun gear shaft hole via bearings.

[0009] Three limiting blocks are welded and fixed on the opposite surfaces of the two gear carriers. Two first gear limiting rings are rotatably mounted on the surface of the sun gear shaft through bearings. The two first gear limiting rings are symmetrically mounted on the sun gear shaft. Three limiting grooves are opened on the opposite sides of the two first gear limiting rings.

[0010] The six limit blocks are respectively engaged with the corresponding limit slots;

[0011] The sun gear is mounted on the surface of the sun gear shaft via a flat key.

[0012] Preferably, the sun gear is mounted on the middle surface of the sun gear shaft.

[0013] Preferably, a planetary gear shaft is provided between the two gear carriers, and planetary shaft holes are provided on the surface of both gear carriers;

[0014] Guide grooves are provided on the opposite surfaces of the two gear carriers. The guide grooves are expanded holes and are located at the edges of the opposite surfaces of the two planetary shaft holes. The upper and lower ends of the planetary gear shaft are rotatably mounted at the corresponding planetary shaft holes through bearings.

[0015] Preferably, the planetary gear is mounted on the middle surface of the planetary gear shaft via a flat key.

[0016] Preferably, two second gear limiting rings are symmetrically installed on the surface of the planetary gear shaft, and both second gear limiting rings are interference-fitted with the planetary gear shaft. The opposite sides of the two second gear limiting rings are both conical.

[0017] The ends of the two second gear limiting rings that are close to the corresponding planetary shaft holes are respectively engaged with the inner walls of the corresponding guide grooves.

[0018] Preferably, the number of planetary gear shafts, planetary gears, second gear limiting rings, planetary shaft holes and guide grooves are all three sets arranged in a circular array on the corresponding gear carriers.

[0019] Preferably, all three planetary gears are meshed with the sun gear.

[0020] Preferably, each of the two gear carriers has three bolt positioning holes on its surface, and the bottom surface of the lower gear carrier has a hexagonal prism-shaped bolt limiting hole at the corresponding bolt positioning hole.

[0021] The two gear carriers are fixed together by three positioning bolts. The three positioning bolts are slidably connected to the corresponding bolt positioning holes, and the lower ends of the three positioning bolts are respectively engaged with the corresponding bolt limiting holes.

[0022] Preferably, a connecting cylinder is welded and fixed above the middle part of the upper gear frame, and a spline groove is formed on the inner wall of the connecting cylinder.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] 1. This large-megawatt multi-planetary gear bore carrier with a positioning structure, during the installation of the sun gear shaft, forms a double guiding structure with the frustum-shaped protrusion in the middle of the opposite surface of the gear carrier and the first guide ring. This directly guides the sun gear shaft to quickly align and be inserted into the sun gear shaft holes of the two gear carriers, effectively preventing shaft tilting. At the same time, the limiting block on the gear carrier precisely engages with the limiting groove of the first gear limiting ring on the surface of the sun gear shaft, which can synchronously complete the circumferential positioning of the sun gear. The initial installation position accuracy of the sun gear can be guaranteed without additional adjustment, effectively reducing vibration and noise, avoiding problems such as accelerated bearing wear and poor gear meshing, and ensuring that the entire transmission system operates efficiently, stably, and for a long life under large-megawatt heavy-load conditions.

[0025] 2. This megawatt-class multi-planetary gear carrier with a positioning structure features an expanded guide groove on the opposite side of the gear carrier. This groove forms a close guiding fit with the tapered second gear limiting rings at both ends of the planetary gear shaft. Utilizing the guiding characteristics of the tapered surface and the expanded hole, the planetary gear shaft can be quickly aligned with the corresponding upper and lower planetary shaft holes, significantly reducing assembly time. Furthermore, the three sets of planetary gear shafts, planetary shaft holes, and guide grooves are arranged in a circular array. Combined with the fixing method where the positioning long bolt passes through the bolt positioning hole and its lower end is engaged with the hexagonal prism-shaped bolt limiting hole, the relative positions of the two gear carriers are fixed, thereby ensuring the parallelism of the axes of the three planetary gear shafts and solving the problem of uneven clearance in the hole-shaft fit during traditional assembly. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] Figure 1 This is a schematic diagram of a large megawatt-class multi-planetary gear hole carrier structure with a positioning structure according to the present invention;

[0028] Figure 2 This is a schematic diagram of the meshing of the sun gear and planetary gear of this utility model;

[0029] Figure 3 This is a schematic diagram of the sun gear shaft of this utility model;

[0030] Figure 4This is a schematic diagram showing the connection between the limiting groove and the limiting block of this utility model;

[0031] Figure 5 This is a schematic diagram of the planetary gear shaft of this utility model;

[0032] Figure 6 This is a schematic diagram of the gear frame of this utility model;

[0033] Figure 7 This is a schematic diagram of the positioning long bolt of this utility model;

[0034] Figure 8 This is a schematic diagram of the first guide ring of this utility model;

[0035] Figure 9 This is a schematic diagram of the second gear limiting ring of this utility model;

[0036] Figure 10 This is a schematic diagram of the first gear limiting ring of this utility model.

[0037] Reference numerals: 1. Gear carrier; 2. Sun gear shaft hole; 3. Sun gear shaft; 4. Positioning bolt; 5. Planetary gear shaft; 6. Sun gear; 7. Planetary gear; 8. First gear limiting ring; 9. First guide ring; 10. Limiting groove; 11. Limiting block; 12. Second gear limiting ring; 13. Planetary shaft hole; 14. Guide groove; 15. Bolt positioning hole; 16. Bolt limiting hole; 17. Connecting cylinder. Detailed Implementation

[0038] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0039] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0041] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0042] Please see Figure 1-10 This utility model provides a technical solution: a large megawatt-level multi-planetary gear hole carrier with a positioning structure, including a sun gear shaft 3 and two gear carriers 1, the two gear carriers 1 are symmetrically arranged vertically, a sun gear positioning assembly is arranged between the two gear carriers 1, the sun gear positioning assembly includes two first guide rings 9, the two first guide rings 9 are symmetrically welded and fixed to the surface of the corresponding gear carrier 1, the middle of the opposite surface of the two gear carriers 1 is a frustum-shaped protrusion, the middle of the middle of the two gear carriers 1 is provided with a sun gear shaft hole 2, the upper and lower end surfaces of the sun gear shaft 3 are rotatably mounted on the inner wall of the corresponding sun gear shaft hole 2 through bearings, three limiting blocks 11 are welded and fixed to the opposite surface of the two gear carriers 1, two first gear limiting rings 8 are rotatably mounted on the surface of the sun gear shaft 3 through bearings, the two first gear limiting rings 8 are symmetrically mounted on the sun gear shaft 3, three limiting grooves 10 are provided on the opposite side of the two first gear limiting rings 8, the six limiting blocks 11 are respectively engaged with the corresponding limiting grooves 10, and a sun gear 6 is mounted on the surface of the sun gear shaft 3 through a flat key.

[0043] The sun gear 6 is mounted on the middle surface of the sun gear shaft 3.

[0044] A planetary gear shaft 5 is provided between two gear carriers 1. Planetary shaft holes 13 are provided on the surface of both gear carriers 1. Guide grooves 14 are provided on the opposite surfaces of the two gear carriers 1. The guide grooves 14 are expansion holes and are located at the edges of the opposite surfaces of the two planetary shaft holes 13. The upper and lower ends of the planetary gear shaft 5 are rotatably mounted at the corresponding planetary shaft holes 13 through bearings.

[0045] Planetary gear 7 is mounted on the middle surface of planetary gear shaft 5 via a flat key.

[0046] Two second gear limiting rings 12 are symmetrically installed on the upper and lower surfaces of the planetary gear shaft 5. Both second gear limiting rings 12 are interference-fitted with the planetary gear shaft 5. The opposite sides of the two second gear limiting rings 12 are conical. The ends of the two second gear limiting rings 12 near the corresponding planetary shaft holes 13 are respectively engaged with the inner walls of the corresponding guide grooves 14.

[0047] The planetary gear shaft 5, planetary gear 7, second gear limiting ring 12, planetary shaft hole 13 and guide groove 14 are each arranged in three sets in a circular array on the corresponding gear carrier 1.

[0048] All three planetary gears 7 are meshed with the sun gear 6.

[0049] Each of the two gear carriers 1 has three bolt positioning holes 15 on its surface. The bottom surface of the lower gear carrier 1 has a hexagonal prism-shaped bolt limiting hole 16 at the corresponding bolt positioning hole 15. The two gear carriers 1 are fixed together by three positioning long bolts 4. The three positioning long bolts 4 are slidably connected to the corresponding bolt positioning holes 15, and the lower ends of the three positioning long bolts 4 are respectively engaged with the corresponding bolt limiting holes 16.

[0050] A connecting cylinder 17 is welded and fixed above the middle part of the upper gear frame 1, and a spline groove is provided on the inner wall of the connecting cylinder 17.

[0051] When the sun gear shaft 3 is installed, its upper and lower ends are engaged with the sun gear shaft holes 2 of the two gear carriers 1 through bearings. The frustum-shaped protrusion in the middle of the opposite surface of the gear carrier 1 and the first guide ring 9 form a double guide structure to guide the sun gear shaft 3 to be installed quickly and accurately, avoiding the shaft tilting during assembly. At the same time, the two first gear limiting rings 8 on the surface of the sun gear shaft 3 are installed synchronously with the shaft, so that the limiting block 11 on the gear carrier 1 is accurately inserted into the limiting groove 10 of the first gear limiting ring 8, completing the circumferential positioning of the sun gear 6.

[0052] The diameter of the sun gear shaft 3 in the middle is larger than the diameters at both ends. At the same time, the first gear limiting ring 8 forms an axial limit on the sun gear 6 to prevent it from moving axially along the sun gear shaft 3. The snap-fit ​​between the first gear limiting ring 8 and the limiting block 11 restricts the circumferential displacement of the sun gear shaft 3. Combined with the radial positioning of the sun gear shaft hole 2 and the bearing, the bidirectional positioning of the sun gear shaft 3 is achieved, ensuring that the sun gear 6 is always in the preset meshing position and avoiding radial runout or axial movement during heavy load operation.

[0053] When the planetary gear shaft 5 is installed, its upper and lower ends are engaged with the planetary shaft holes 13 of the gear carrier 1 through bearings. The expanding guide groove 14 opened on the opposite side of the gear carrier 1 forms a guiding engagement with the second gear limiting ring 12 with a conical shape on the opposite side of the planetary gear shaft 5. By utilizing the guiding effect of the conical surface and the expanding hole, the planetary gear shaft 5 is guided to quickly align with the corresponding upper and lower planetary shaft holes 13, which greatly reduces the assembly difficulty. The three sets of planetary gear shafts 5, planetary shaft holes 13 and guide grooves 14 are arranged in a ring array. Through a unified guiding and positioning structure, the parallelism of the axes of the three planetary gear shafts 5 is ensured.

[0054] The second gear limiting ring 12 is interference-fitted with the planetary gear shaft 5 and is engaged with the inner wall of the guide groove 14, forming an axial limit for the planetary gear shaft 5. Together with the large-diameter structure in the middle of the planetary gear shaft 5, it limits the axial movement of the planetary gear 7, preventing the planetary gear shaft 5 and the planetary gear 7 from moving axially. The radial fit between the planetary shaft hole 13 and the bearing, combined with the auxiliary positioning of the guide groove 14 and the second gear limiting ring 12, limits the radial runout of the planetary gear shaft 5, ensuring that all three planetary gears 7 can accurately mesh with the sun gear 6, avoiding off-center loading.

[0055] The two gear carriers 1 are symmetrically fixed by three sets of positioning bolts 4. The positioning bolts 4 pass through the bolt positioning holes 15 of the upper and lower gear carriers 1, and the lower end is engaged in the bolt limiting hole 16 of the lower gear carrier 1. The bolt limiting hole 16 is hexagonal prism-shaped, which can restrict the circumferential rotation of the positioning bolts 4 and ensure that the relative position of the two gear carriers 1 is accurately fixed, providing a unified reference for the installation of the sun gear shaft 3 and the planetary gear shaft 5. The connecting cylinder 17 of the upper gear carrier 1 is connected to the external power component or load component through the spline groove on the inner wall to realize the input or output of power.

[0056] During operation, external power is transmitted to the gear carrier 1 through the connecting cylinder 17, or to the sun gear 6 through the sun gear shaft 3. When the sun gear 6 rotates, it drives the three planetary gears 7 meshing with it to rotate synchronously. The planetary gears 7 drive the planetary gear shaft 5 to rotate stably in the planetary shaft hole 13 through the flat key. Since the sun gear shaft 3 and the planetary gear shaft 5 are precisely positioned through the positioning structure at both ends, the gear meshing clearance is uniform and the force is balanced, which effectively reduces vibration and noise, avoids problems such as accelerated bearing wear and poor gear meshing, and ensures that the entire transmission system operates efficiently, stably and for a long time under heavy load conditions at the megawatt level.

[0057] Furthermore, during installation, the sun gear shaft 3 forms a double guiding structure with the frustum-shaped protrusion in the middle of the opposite surface of the gear carrier 1 and the first guide ring 9, which can directly guide the sun gear shaft 3 to quickly align and be inserted into the sun gear shaft holes 2 of the two gear carriers 1, effectively preventing the shaft from tilting. At the same time, the limiting block 11 on the gear carrier 1 is precisely engaged with the limiting groove 10 of the first gear limiting ring 8 on the surface of the sun gear shaft 3, which can simultaneously complete the circumferential positioning of the sun gear 6, ensuring the initial installation position accuracy of the sun gear 6 without additional adjustment.

[0058] The expanding guide groove 14 on the opposite side of the gear carrier 1 forms a close guiding fit with the second gear limiting ring 12 with tapered ends of the planetary gear shaft 5. Utilizing the guiding characteristics of the tapered surface and the expanding hole, the planetary gear shaft 5 can be guided to quickly align with the corresponding upper and lower planetary shaft holes 13, significantly reducing assembly time. Furthermore, the three sets of planetary gear shafts 5, planetary shaft holes 13, and guide groove 14 are arranged in a circular array. Combined with the fixing method where the positioning long bolt 4 passes through the bolt positioning hole 15 and its lower end is engaged with the hexagonal prism-shaped bolt limiting hole 16, the relative positions of the two gear carriers 1 can be fixed, thereby ensuring the parallelism of the axes of the three planetary gear shafts 5 and solving the problem of uneven hole-shaft fit clearance in traditional assembly.

[0059] The diameter of the middle part of the sun gear shaft 3 is larger than the diameters at both ends, which can form an axial limit for the sun gear 6. Combined with the snapping action of the first gear limiting ring 8 and the limiting block 11, it can effectively prevent the sun gear 6 from moving axially along the sun gear shaft 3. At the same time, the two ends of the sun gear shaft 3 are connected to the sun gear shaft hole 2 through bearings to achieve radial positioning. Combined with the restriction of the circumferential displacement of the sun gear shaft 3 by the first gear limiting ring 8, it ensures that the sun gear 6 is always in the preset meshing position, avoiding radial runout during heavy load operation.

[0060] The diameter of the middle part of the planetary gear shaft 5 is larger than that of both ends, which can axially limit the planetary gears 7. The second gear limiting ring 12 on its surface is interference-fitted with the planetary gear shaft 5 and is engaged with the inner wall of the guide groove 14, further enhancing the axial limiting effect of the planetary gear shaft 5. At the same time, the two ends of the planetary gear shaft 5 are radially positioned by bearings and planetary shaft holes 13. With the auxiliary positioning of the guide groove 14 and the second gear limiting ring 12, the radial runout of the planetary gear shaft 5 can be effectively limited, ensuring that all three planetary gears 7 are precisely meshed with the sun gear 6, avoiding gear overload, and adapting to the heavy-load and high-frequency start-stop conditions of large megawatt-level transmission systems.

[0061] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A large-megawatt multi-planetary gear bore carrier with a positioning structure, characterized in that: It includes a sun gear shaft (3) and two gear carriers (1), which are arranged symmetrically on the top and bottom; The sun gear positioning assembly is disposed between two gear carriers (1). The sun gear positioning assembly includes two first guide rings (9), which are symmetrically welded and fixed to the surface of the corresponding gear carriers (1). The two gear carriers (1) have a frustum-shaped protrusion in the middle of their opposite surfaces. The two gear carriers (1) have a sun gear shaft hole (2) in the middle. The upper and lower surfaces of the sun gear shaft (3) are rotatably mounted on the inner wall of the corresponding sun gear shaft hole (2) through bearings. Three limiting blocks (11) are welded and fixed on the opposite surfaces of the two gear carriers (1). Two first gear limiting rings (8) are installed on the surface of the sun gear shaft (3) through the bearing. The two first gear limiting rings (8) are symmetrically installed on the sun gear shaft (3). Three limiting grooves (10) are opened on the opposite sides of the two first gear limiting rings (8). The six limit blocks (11) are respectively engaged with the corresponding limit slots (10); The sun gear (6) is mounted on the surface of the sun gear shaft (3) via a flat key.

2. The large-megawatt multi-planetary gear bore carrier with a positioning structure according to claim 1, characterized in that: The sun gear (6) is mounted on the middle surface of the sun gear shaft (3).

3. The large-megawatt multi-planetary gear bore carrier with a positioning structure according to claim 1, characterized in that: A planetary gear shaft (5) is provided between the two gear carriers (1), and a planetary shaft hole (13) is provided on the surface of both gear carriers (1); Guide grooves (14) are provided on the opposite surfaces of the two gear carriers (1). The guide grooves (14) are expanded holes. The guide grooves (14) are located at the edges of the opposite surfaces of the two planetary shaft holes (13). The upper and lower ends of the planetary gear shaft (5) are rotatably mounted at the corresponding planetary shaft holes (13) through bearings.

4. A large-megawatt multi-planetary gear bore carrier with a positioning structure according to claim 3, characterized in that: The planetary gear (7) is mounted on the middle surface of the planetary gear shaft (5) via a flat key.

5. A large-megawatt multi-planetary gear bore carrier with a positioning structure according to claim 3, characterized in that: Two second gear limiting rings (12) are symmetrically installed on the surface of the planetary gear shaft (5). Both second gear limiting rings (12) are interference-fitted with the planetary gear shaft (5). The opposite sides of the two second gear limiting rings (12) are conical. The two second gear limiting rings (12) are engaged with the inner wall of the corresponding guide groove (14) at one end near the corresponding planetary shaft hole (13).

6. A large-megawatt multi-planetary gear bore carrier with a positioning structure according to claim 3, characterized in that: The number of planetary gear shafts (5), planetary gears (7), second gear limiting rings (12), planetary shaft holes (13) and guide grooves (14) are all arranged in three sets in a circular array on the corresponding gear carriers (1).

7. A large-megawatt multi-planetary gear bore carrier with a positioning structure according to claim 4, characterized in that: All three planetary gears (7) are meshed with the sun gear (6).

8. A large-megawatt multi-planetary gear bore carrier with a positioning structure according to claim 1, characterized in that: Three bolt positioning holes (15) are provided on the surface of both gear carriers (1), and a hexagonal bolt limiting hole (16) is provided at the bolt positioning hole (15) on the bottom surface of the lower gear carrier (1). The two gear carriers (1) are fixed together by three positioning bolts (4). The three positioning bolts (4) are slidably connected to the corresponding bolt positioning holes (15) respectively, and the lower ends of the three positioning bolts (4) are respectively engaged with the corresponding bolt limiting holes (16).

9. A large-megawatt multi-planetary gear bore carrier with a positioning structure according to claim 1, characterized in that: A connecting cylinder (17) is welded and fixed above the middle part of the gear frame (1) on the upper side, and a spline groove is provided on the inner wall of the connecting cylinder (17).

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