Wind power generation main shaft and gearbox integrated transmission structure

Abstract

The invention discloses a wind power generation main shaft and gear box integrated transmission structure, and aims to solve the problems of high mounting difficulty, difficulty in later maintenance, long main shaft length, overhigh cost and the like in a traditional structure. The transmission structure comprises a main shaft, a planet carrier, a first bearing, a second bearing, a sealing assembly and a gearbox body. The main shaft and the planet carrier are in conical surface interference connection, the main shaft is connected with the gearbox body through a first bearing, and the planet carrier is connected with the gearbox body through a second bearing; the sealing assembly is in interference connection with the main shaft, the sealing assembly is located at the first end of the gearbox body, and the sealing assembly abuts against the first end of the first bearing. The main shaft and the planet carrier are integrated, the length of the whole transmission chain is shortened, the structure is more compact, the transmission effect is better, meanwhile, installation and maintenance are convenient, and cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generator sets, and in particular to an integrated transmission structure of a wind power generation main shaft and a gear box. Background Art

[0002] The transmission chain of a wind turbine generator set mainly includes main components such as the main shaft, main bearing, bearing seat, gearbox, generator, coupling, etc. Among them, the design of the main shaft and gearbox transmission structure is the core of the entire transmission chain, affecting the overall layout design and main costs of the machine.

[0003] At present, wind turbines are developing towards larger megawatts and higher torques, and competition is becoming increasingly fierce. How to ensure the reliability of the wind turbine transmission chain while taking into account economic efficiency through improvements and innovative designs of the main shaft and gearbox transmission structure is the key consideration for all manufacturers.

[0004] The traditional connection design between the main shaft and the input end of the gearbox mainly relies on the locking plate expansion structure connection. The main shaft is supported by two main shaft bearings in the upwind and downwind directions. The bearing seat of the downwind main shaft bearing is not connected to the gearbox. The main shaft and the input end of the gearbox adopt interference fit and are fixed with a locking plate to transmit torque. With the large-scale wind turbines, the design size of the locking plate is too large, the cost is too high, and the installation is difficult. In addition, under this structural form, the main shaft and the gearbox are manufactured and assembled separately before being assembled as a whole. The main shaft needs to be hoisted in a horizontal state and inserted into the input end of the gearbox. This method is difficult to ensure the centering accuracy and the assembly process is prone to jamming. These problems are becoming more and more prominent in large-megawatt units, and the cost of tooling equipment required is also greatly increased.

[0005] In recent years, the integration of the main shaft and the gearbox has become another mainstream hot spot in current design. The main shaft is supported by two main shaft bearings in the upwind and downwind directions. The bearing seat of the downwind main shaft bearing is connected to the gearbox. The main shaft and the input end of the gearbox are connected by bolts or a combination of bolts and shear pins through flanges. The input end of the gearbox in this structure is connected to the main shaft through flanges, and the input end of the gearbox is suspended on the main shaft, and there is no bearing support at the rear end. The flange bolts or shear pins of this method need to be torqued from the hollow shaft of the main shaft, which has a small space and is difficult to install and maintain later. At the same time, expensive friction plates must also be configured. It is difficult to disassemble in situations where disassembly is required, such as failure or testing. After disassembly, the bolts and shear pins are scrapped and cannot be used. On the other hand, the input end of the gearbox is suspended on the main shaft, and the actual load-bearing coefficient of the planetary gear at the input end of the gearbox is difficult to guarantee. In addition, the main shaft length of this scheme is relatively long, resulting in a longer transmission chain and cabin size, which is not conducive to reducing costs. Summary of the invention

[0006] The purpose of the present invention is to provide a wind power generation main shaft and gearbox integrated transmission structure, aiming to solve the problems existing in the traditional structure such as high installation difficulty, difficult later maintenance, long main shaft length and high cost.

[0007] In order to solve the above problems, the present invention provides a wind power generation main shaft and gear box integrated transmission structure, including a main shaft, a planet carrier, a first bearing, a second bearing, a sealing assembly and a gear box body;

[0008] The main shaft and the planet carrier are connected by a conical interference fit, the main shaft is connected to the gear box body through the first bearing, and the planet carrier is connected to the gear box body through the second bearing;

[0009] The sealing assembly is interference-connected with the main shaft, the sealing assembly is located at the first end of the gearbox housing, and the sealing assembly abuts against the first end of the first bearing;

[0010] The shaft system structure consisting of the main shaft, the planet carrier, the first bearing and the second bearing is integrated in the gear box body.

[0011] Preferably, the sealing assembly includes a labyrinth cover and an oil slinger ring, the labyrinth cover is in interference connection with the main shaft, the oil slinger ring is in interference connection with the main shaft, and the labyrinth cover abuts against the first end of the first bearing through the oil slinger ring.

[0012] Preferably, the sealing assembly further comprises an end cover, wherein the end cover is fixedly connected to the gear box housing, and the end cover is adaptably connected to the labyrinth cover.

[0013] Preferably, the transmission structure further includes a first position-limiting member, the first position-limiting member is connected to the main shaft, and the first position-limiting member abuts against the second end of the first bearing.

[0014] Preferably, the main shaft includes a first shaft segment and a second shaft segment, the outer diameter of the first shaft segment is larger than the outer diameter of the second shaft segment, the second shaft segment is interference connected with the planetary carrier, the first limiting member is arranged on the circumferential side close to the end of the first shaft segment, the main shaft is a hollow shaft, and the wall thickness of the second shaft segment is larger than the wall thickness of the planetary carrier.

[0015] Preferably, the gearbox housing comprises a first housing, a ring gear and a second housing, the first housing is fixedly connected to a first end of the ring gear, the second end of the ring gear is connected to the second housing, and the ring gear is sleeved on the planet carrier.

[0016] Preferably, the main shaft is connected to the inner ring of the first bearing in an interference connection, and the first housing is connected to the outer ring of the first bearing in a transition connection;

[0017] The planet carrier is interference connected to the inner ring of the second bearing, and the second housing is transitionally connected to the outer ring of the second bearing.

[0018] Preferably, the transmission structure further comprises a second limiting member, and the second limiting member comprises a first pressing plate and a second pressing plate;

[0019] The first pressure plate is fixed inside the second housing and is used to fix the outer ring of the second bearing. The second pressure plate is fixed on the planet carrier and is used to fix the inner ring of the second bearing.

[0020] Preferably, a planetary gear and a sun gear are provided in the planetary carrier, the sun gear is colinear with the axis of the main shaft, and the ring gear is meshed with the sun gear through the planetary gear.

[0021] Preferably, the first bearing structure is a double-row tapered roller bearing, and the second bearing structure is a cylindrical roller bearing with no ribs on the inner ring.

[0022] Through such a setting, the main shaft and the planetary carrier are connected by a conical interference fit, so that the main shaft and the planetary carrier are integrated, and at the same time, a first bearing is arranged on the main shaft, and a second bearing is arranged on the planetary carrier, so that the main shaft and the planetary carrier are integrated in the gear box body. The sealing component is connected to the main shaft by an interference fit, and the sealing component is arranged at the end of the first bearing and the gear box body to achieve a sealing effect and prevent lubricating oil leakage.

[0023] The above technical solution of the present invention has the following beneficial technical effects:

[0024] 1. This type of transmission structure makes the main shaft and the first-stage planetary carrier bearing form an over-static structure. Under the load of the wind wheel, the main shaft and the first-stage planetary carrier shaft system undergo elastic deformation, and the bearing capacity is distributed through deformation coordination, so that the bearing capacity distribution is reasonable, and large torque transmission can be achieved with smaller bearing, main shaft, and planetary carrier size parts.

[0025] 2. This transmission structure system has a strong load-bearing capacity and can well realize the transmission of large torque, withstand the bending and torsion loads and impact loads of the wind wheel under various working conditions, greatly reduce the size of the main shaft transmission chain, and reduce the cost of the transmission chain. This structure has better balanced load characteristics and can be applied to larger megawatt wind turbines.

[0026] 3. This transmission structure realizes the integration of the main shaft and the first-stage planetary carrier, shortens the overall transmission chain length, makes the structure compact, shortens the cabin length, and reduces the cabin cost.

[0027] 4. This transmission structure does not require a locking plate, bolts, shear pins, friction plates, etc. It is easy to install and reduces costs.

[0028] 5. The conical surface matching structure adopted by the main shaft and the first-stage planetary carrier of this structure makes the installation simple and the transmission reliable. The main shaft rotation axis and the first-stage planetary carrier rotation bearing have high concentricity and rotation accuracy, which is beneficial to reduce the gear eccentric load and bearing load eccentric load. In addition, it has the characteristics of large bending moment and torque transmission and maintenance-free. Moreover, the interference connection can be disassembled by hydraulic device, which can realize the reuse of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of an integrated transmission structure of a wind power generation main shaft and a gearbox according to an embodiment of the present invention;

[0030] Figure 2 yes Figure 1 Schematic enlargement of part A in the middle.

[0031] Reference numerals:

[0032] 1. Main axis; 11. First axis section; 12. Second axis section;

[0033] 2. Planet carrier; 3. First bearing; 4. Second bearing;

[0034] 5. Sealing assembly; 51. Labyrinth cover; 52. Oil slinger; 53. End cover;

[0035] 6. Gear box housing; 61. First housing; 62. Ring gear; 63. Second housing;

[0036] 7. A first limiting member;

[0037] 8. Second position-limiting member; 81. First pressing plate; 82. Second pressing plate. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0039] The accompanying drawings show schematic diagrams of layer structures according to embodiments of the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clarity. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0040] Combination Figure 1The present invention provides a wind power generation main shaft 1 and gearbox integrated transmission structure, including a main shaft 1, a planet carrier 2, a first bearing 3, a second bearing 4, a sealing assembly 5 and a gearbox housing 6; the main shaft 1 and the planet carrier 2 are connected by a conical interference fit, the main shaft 1 is connected to the gearbox housing 6 through the first bearing 3, and the planet carrier 2 is connected to the gearbox housing 6 through the second bearing 4; the sealing assembly 5 is connected by an interference fit with the main shaft 1, the sealing assembly 5 is located at the first end of the gearbox housing 6, and the sealing assembly 5 abuts against the first end of the first bearing 3; the shaft system structure composed of the main shaft 1, the planet carrier 2, the first bearing 3 and the second bearing 4 is integrated in the gearbox housing 6. Through such a setting, the main shaft 1 and the planet carrier 2 are connected by a conical interference fit, so that the main shaft 1 and the planet carrier 2 are integrated as one, and at the same time, the first bearing 3 is arranged on the main shaft 1, and the second bearing 4 is arranged on the planet carrier 2, so that the main shaft 1 and the planet carrier 2 are integrated in the gearbox housing 6. The sealing assembly 5 is connected with the main shaft 1 by interference fit, and the sealing assembly 5 is arranged at the ends of the first bearing 3 and the gearbox housing 6 to achieve a sealing effect and prevent lubricating oil leakage. Specifically, in the transmission structure, the main shaft 1 is connected to the wind wheel and the gearbox to transmit torque; the first bearing 3 is used to support the main shaft 1 and bear the load and bending moment from the wind wheel; the second bearing 4 supports the planet carrier 2 and bears radial load.

[0041] It should be noted that the interference fit connection between the main shaft 1 and the planetary carrier 2 adopts a conical surface structure. The shape characteristics of the conical interference fit connection make the connected components have good centering, which helps to maintain the precise alignment of the transmission system. In addition, the conical interference fit connection can withstand large loads, especially in situations where the load is large and multiple assembly and disassembly are required. Compared with the traditional complex connection method, the conical interference fit connection has a simple structure and is easy to process and assemble. Furthermore, due to the friction force generated by the interference fit, the conical interference fit connection has a high load-bearing capacity and can withstand torque, axial force or a combined load of the two, which can ensure the stable operation of wind power generation. Under impact loads, the conical interference fit connection has good performance and can provide overload protection. In extreme environments, the conical interference fit connection can also ensure the stability of the connection between the main shaft 1 and the planetary carrier 2. The conical interference fit connection can be installed and removed by heating the containing part or using hydraulic pressure, making the assembly and disassembly process relatively simple, thereby achieving structural compliance and saving costs. In the wind turbine generator set, the beneficial effects of the large conical interference connection between the main shaft 1 and the planetary carrier 2 include: improving the integration of the main shaft 1 and the planetary carrier 2, reducing the number of components in the transmission chain, thereby reducing costs and maintenance difficulties. Due to the high load-bearing capacity of the conical interference connection, a larger torque can be transmitted, which helps to improve the efficiency and reliability of the wind turbine generator set. The simplified structure helps to reduce the stress concentration of the components and improve the durability and stability of the entire transmission system. The specific size of the conical surface at the connection between the main shaft 1 and the planetary carrier 2 is not limited here. In a feasible embodiment, the taper of the conical surface between the main shaft 1 and the planetary carrier 2 is 1:50, that is, the bottom circle diameter of the cone is 1 unit length, and the cone height is 50 unit lengths. In order to facilitate the precise alignment of parts and the transmission of torque, the main shaft 1 and the planetary carrier 2 can reasonably distribute the bearing capacity of the bearings when they are subjected to bending and torsion loads and impact loads under various working conditions of the wind wheel, and realize the transmission of large torque.

[0042] The specific structure of the planet carrier 2 is not limited here, and it only needs to cooperate with the main shaft 1 to realize the connection between the gear box and the wind turbine rotor. In a preferred case, a plurality of pressure relief holes are provided on the inner surface of the planet carrier 2. During the disassembly process, high-pressure oil is injected between the planet carrier 2 and the main shaft 1 through the pressure relief holes, which is beneficial to the disassembly of the planet carrier 2 and the main shaft 1 and facilitates the reuse of parts. The number, aperture and distribution of the pressure relief holes are not limited here. In one embodiment, three pressure relief holes are provided in the planet carrier 2, and the aperture is 12 mm. The three pressure relief holes are evenly distributed in the length direction of the planet carrier 2, so as to ensure the uniform release of pressure and avoid excessive local pressure.

[0043] The specific structure of the sealing assembly 5 is not limited here, as long as it can achieve a sealing effect and prevent the lubricating oil from leaking. Figure 1 and Figure 2In a preferred embodiment, the sealing assembly 5 includes a labyrinth cover 51 and an oil slinger 52. The labyrinth cover 51 is in interference connection with the main shaft 1, and the oil slinger 52 is in interference connection with the main shaft 1. The labyrinth cover 51 abuts against the first end of the first bearing 3 through the oil slinger 52. By interferingly connecting the labyrinth cover 51 to the main shaft 1, the sealing effect of the labyrinth cover 51 is improved. The specific structure of the labyrinth cover 51 is not limited here. Specifically, the labyrinth cover 51 forms a labyrinth seal through its concave-convex combination structure to effectively prevent lubricating oil leakage. Furthermore, the labyrinth cover 51 and the oil slinger 52 cooperate to improve the sealing effect. The oil slinger 52 is installed on the main shaft 1 and is located on the side of the first bearing 3 close to the labyrinth cover 51 to achieve the functions of lubrication and sealing. The specific structure of the oil slinger 52 is not limited here, and it is sufficient to cooperate with the labyrinth cover 51 to complete the sealing of the lubricating oil. The installation method of the labyrinth cover 51 is not limited. It can be an interference connection on the main shaft 1. The concave-convex structure of the labyrinth cover 51 and the end of the gear box housing 6 are adapted to form a seal. In a preferred case, the sealing assembly 5 also includes an end cover 53, which is fixedly connected to the gear box housing 6 and is adapted to the labyrinth cover 51. Through such a setting, the end cover 53 is separately set at the end of the gear box housing 6, and the concave-convex structure of the end cover 53 and the labyrinth cover 51 are adapted, which is more conducive to the installation of the labyrinth cover 51 and the end cover 53, and is easy to operate. At the same time, the end cover 53 also plays a role in fixing the first bearing 3 and preventing the first bearing 3 from moving axially, thereby improving the stability of the structure and the sealing effect. The connection method between the end cover 53 and the gear box housing 6 is not limited here, and it can be a snap connection, a screw connection, etc.

[0044] In a preferred case, the transmission structure further includes a first limiting member 7, which is connected to the main shaft 1 and abuts against the second end of the first bearing 3. By providing the first limiting member 7, the first limiting member 7 and the sealing assembly 5 respectively fix the two ends of the first bearing 3, ensuring that the position of the first bearing 3 is fixed during the operation of the wind turbine generator set, and preventing the first bearing 3 from axial movement.

[0045] In a preferred case, the main shaft 1 includes a first shaft section 11 and a second shaft section 12, the outer diameter of the first shaft section 11 is greater than the outer diameter of the second shaft section 12, the second shaft section 12 is in interference connection with the planet carrier 2, and the first limiting member 7 is arranged on the circumferential side near the end of the first shaft section 11. Through such an arrangement, the second shaft section 12 is in interference connection with the planet carrier 2, ensuring the transmission effect between the wind wheel and the gear box, the outer diameter of the first shaft section 11 is greater than the outer diameter of the second shaft section 12, so that after the second shaft section 12 extends into the planet carrier 2, the first shaft section 11 can abut against the end of the planet carrier 2, thereby ensuring that the relative position of the main shaft 1 and the planet carrier 2 is fixed, and during the operation of the wind turbine generator set, the main shaft 1 is firmly connected with the planet carrier 2, and the abutment of the second shaft section 12 with the planet carrier 2 can prevent the main shaft 1 from moving into the planet carrier 2. The specific size relationship between the first shaft section 11 and the second shaft section 12 of the main shaft 1 is not limited here. In a preferred case, the main shaft 1 is a hollow shaft, and the wall thickness of the second shaft section 12 is greater than the wall thickness of the planet carrier 2. By such a setting, the increase in the wall thickness of the main shaft 1 within the interference connection length can improve the reliability of the connection, reduce the deformation under heavy load or impact load, and help to improve the overall rigidity of the combination of the main shaft 1 and the planetary carrier 2, while allowing a certain amount of thermal expansion space. The specific relationship between the wall thickness of the second shaft segment 12 and the planetary carrier 2 is not limited here. In one embodiment, the wall thickness of the second shaft segment 12 is more than 1.5 times the wall thickness of the planetary carrier 2 to ensure the connection strength. The positional relationship between the ends of the first shaft segment 11 and the second shaft segment 12 and the planetary carrier 2 is not limited here. In an optional case, the ends of the first shaft segment 11 and the second shaft segment 12 are not in contact with the planetary carrier 2. During the assembly process, the connection strength of the main shaft 1 and the planetary carrier 2 is ensured by controlling the interference connection length between the second shaft segment 12 and the planetary carrier 2; in another optional case, the end of the second shaft segment 12 abuts against the planetary carrier 2, so that during the assembly process of the main shaft 1 and the planetary carrier 2, the interference connection length of the main shaft 1 and the planetary carrier 2 is ensured by the abutment of the second shaft segment 12 with the planetary carrier 2.

[0046] In a preferred case, the gearbox housing 6 includes a first housing 61, a ring gear 62 and a second housing 63. The first housing 61 is fixedly connected to the first end of the ring gear 62, and the second end of the ring gear 62 is connected to the second housing 63. The ring gear 62 is sleeved on the planet carrier 2. Through such a setting, the first housing 61 is used to accommodate the first bearing 3 and the main shaft 1. The connection method of the first housing 61 and the frame of the wind turbine generator set is not limited here. In one embodiment, a plurality of elastic support holes are circumferentially arranged at one end of the first housing 61, and the first housing 61 is fixed to the frame through the elastic support holes. The number of elastic support holes is not limited here. According to the size of the wind turbine generator set, 30 elastic support holes can be set. The ring gear 62 cooperates with the planet carrier 2 to form a planetary gear system to achieve torque transmission. The second housing 63 cooperates with the first housing 61 to fix the second bearing 4, thereby realizing that the shaft system structure composed of the main shaft 1, the planet carrier 2, the first bearing 3 and the second bearing 4 is integrated in the gearbox housing 6. Splitting the gear box body 6 into the first body 61, the ring gear 62 and the second body 63 is helpful to reduce the difficulty of installation and facilitate operation.

[0047] In a preferred case, the main shaft 1 is connected with the inner ring of the first bearing 3 by interference fit, and the first housing 61 is connected with the outer ring of the first bearing 3 by transition fit; the planet carrier 2 is connected with the inner ring of the second bearing 4 by interference fit, and the second housing 63 is connected with the outer ring of the second bearing 4 by transition fit. Through such a setting, the main shaft 1 is connected with the inner ring of the first bearing 3 by interference fit, and the planet carrier 2 is connected with the inner ring of the second bearing 4 by interference fit, ensuring that there is no relative sliding between the inner ring of the first bearing 3 and the main shaft 1, and there is no relative sliding between the inner ring of the second bearing 4 and the planet carrier 2, thereby improving the stability of the structure, and realizing the precise alignment between the inner ring of the first bearing 3 and the main shaft 1, and between the inner ring of the second bearing 4 and the planet carrier 2, which is very important for high-speed rotating mechanical parts, can withstand large loads, and is suitable for heavy-load applications. The interference fit can also reduce the setting of other fixed parts, simplify the mechanical structure, facilitate installation and molding, and save costs. Furthermore, the outer ring of the first bearing 3 is transitionally connected to the first housing 61, and the outer ring of the second bearing 4 is transitionally connected to the second housing 63. Through such an arrangement, a certain amount of thermal expansion space is allowed between the outer ring of the first bearing 3 and the first housing 61, and between the outer ring of the second bearing 4 and the second housing 63, to avoid additional stress caused by temperature changes. At the same time, the transition connection can reduce the setting of fixed parts while ensuring the connection strength, and can also simplify the mechanical structure. The design of interference connection and transition connection helps to improve assembly accuracy, ensure the reliability and durability of the mechanical system, and reduce maintenance costs and time.

[0048] In a preferred case, the transmission structure further includes a second limiting member 8, which includes a first pressing plate 81 and a second pressing plate 82; the first pressing plate 81 is fixed to the inner side of the second housing 63, and is used to fix the outer ring of the second bearing 4, and the second pressing plate 82 is fixed to the planet carrier 2, and is used to fix the inner ring of the second bearing 4. The first pressing plate 81 and the second pressing plate 82 can ensure that the second bearing 4 is fixed at the position of the planet carrier 2 and the second housing 63, thereby improving the stability of the overall structure.

[0049] In a preferred case, planetary gears and sun gears are provided in the planetary carrier 2, the sun gear is colinear with the axis of the main shaft 1, and the ring gear 62 is used to mesh with the sun gear. Specifically, the planetary gear includes planetary gear teeth and planetary gear bearings, and the planetary gear bearings are sleeved on the pin shaft connected to the planetary carrier 2. The planetary gear teeth and the planetary gear bearings rotate around the pin shaft, and the pin shaft rotates around the sun gear with the planetary carrier. The planetary gear teeth are respectively meshed with the teeth on the ring gear 62 and the sun gear, thereby driving the sun gear to rotate. The number of planetary gears is not limited here, as long as the transmission between the ring gear 62 and the sun gear can be realized. There can be three or more planetary gears to ensure the stability of the transmission.

[0050] In a preferred case, the first bearing 3 is a double-row tapered roller bearing, and the second bearing 4 is a cylindrical roller bearing with no flange on the inner ring. In a wind turbine generator set, the first bearing 3 bears the combined load and bending moment from the wind wheel, is a fixed end bearing, and bears the main load. Setting the first bearing 3 as a double-row tapered roller bearing is conducive to improving the radial load-bearing capacity of the first bearing 3, reducing the friction coefficient, and being more stable during high-speed operation; the second bearing 4 supports the planetary carrier 2, as a floating end bearing, and bears radial loads. The second bearing 4 is set as a cylindrical roller bearing with no flange on the inner ring. In the integrated transmission structure of the main shaft 1 and the gearbox of the wind turbine generator set, the first bearing 3 adopts a double-row tapered roller bearing, which can bear a large combined load and provide good support and positioning; the second bearing 4 adopts a cylindrical roller bearing with no flange on the inner ring, which allows axial displacement, adapts to thermal expansion, and ensures the stable operation of the transmission chain. In one embodiment, the cone angle of the first bearing 3 is between 16° and 19°, and the axial clearance is 2.2mm-2.5mm, allowing the shaft to have a certain amount of movement space during thermal expansion, avoiding additional stress caused by thermal expansion, ensuring the normal operation of the bearing, reducing friction and wear inside the bearing, and extending the service life of the bearing. The radial clearance of the second bearing 4 is 0.45mm-0.55mm, which can adapt to different working conditions, such as high speed, high temperature or impact load, reducing maintenance costs and downtime, and improving production efficiency.

[0051] In one embodiment of the present invention, a wind power generation main shaft 1 and a gearbox are integrated with a transmission structure, and the assembly process is as follows:

[0052] The labyrinth cover 51 is installed on the main shaft 1 by interference fit, and then the end cover 53 is inserted into the main shaft 1, the oil slinger 52 is installed on the main shaft 1 by interference fit, and then the first bearing 3 is installed by interference fit, and after the first bearing 3 is installed, the first limiting member 7 is installed.

[0053] Then the planet carrier 2 and the main shaft 1 are fitted by interference fit. After the planet carrier 2 is assembled, the planetary gears and the planetary gear bearings are installed, and then the first housing 61 is installed. Then the end cover 53 and the first housing 61 are fastened with bolts. The pin of the planetary gear is installed, the inner ring of the second bearing 4 is installed into the tail of the planet carrier 2, and then the ring gear 62 and the second pressure plate 82 are installed, and then the ring gear is installed.

[0054] The outer ring of the second bearing 4 is installed in the second housing 63, and then installed in the first pressing plate 81, and the second housing 63 is integrally connected with the gear ring 62. The outer ring of the second bearing 4 is combined with the inner ring, and finally installed in the sun gear.

[0055] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A wind power generation main shaft (1) and a gearbox integrated transmission structure, characterized in that: It comprises a main shaft (1), a planet carrier (2), a first bearing (3), a second bearing (4), a sealing assembly (5) and a gear box body (6); The main shaft (1) and the planet carrier (2) are connected by a conical interference fit, the main shaft (1) is connected to the gear box body (6) via the first bearing (3), and the planet carrier (2) is connected to the gear box body (6) via the second bearing (4); The sealing assembly (5) is interference-connected with the main shaft (1), the sealing assembly (5) is located at a first end of the gear box housing (6), and the sealing assembly (5) abuts against a first end of the first bearing (3); The shaft system structure composed of the main shaft (1), the planet carrier (2), the first bearing (3) and the second bearing (4) is integrated in the gear box body (6).

2. The transmission structure according to claim 1, characterized in that: The sealing assembly (5) comprises a labyrinth cover (51) and an oil slinger (52); the labyrinth cover (51) is in interference connection with the main shaft (1); the oil slinger (52) is in interference connection with the main shaft (1); the labyrinth cover (51) abuts against the first end of the first bearing (3) via the oil slinger (52).

3. The transmission structure according to claim 2, characterized in that: The sealing assembly (5) further comprises an end cover (53), wherein the end cover (53) is fixedly connected to the gear box housing (6), and the end cover (53) is adaptively connected to the labyrinth cover (51).

4. The transmission structure according to claim 3, characterized in that: The transmission structure further comprises a first position-limiting member (7), the first position-limiting member (7) being connected to the main shaft (1), and the first position-limiting member (7) being in abutment with the second end of the first bearing (3).

5. The transmission structure according to claim 4, characterized in that: The main shaft (1) comprises a first shaft section (11) and a second shaft section (12); the outer diameter of the first shaft section (11) is greater than the outer diameter of the second shaft section (12); the second shaft section (12) is interference-connected with the planet carrier (2); the first limiting member (7) is arranged on the circumferential side close to the end of the first shaft section (11); the main shaft (1) is a hollow shaft; the wall thickness of the second shaft section (12) is greater than the wall thickness of the planet carrier (2).

6. The transmission structure according to claim 1, characterized in that: The gear box housing (6) comprises a first housing (61), a ring gear (62) and a second housing (63); the first housing (61) is fixedly connected to a first end of the ring gear (62); the second end of the ring gear (62) is connected to the second housing (63); and the ring gear (62) is sleeved on the planet carrier (2).

7. The transmission structure according to claim 6, characterized in that: The main shaft (1) is interference-connected with the inner ring of the first bearing (3), and the first housing (61) is transitionally connected with the outer ring of the first bearing (3); The planet carrier (2) is interference-connected with the inner ring of the second bearing (4), and the second housing (63) is transitionally connected with the outer ring of the second bearing (4).

8. The transmission structure according to claim 7, characterized in that: The transmission structure further comprises a second position-limiting member (8), wherein the second position-limiting member (8) comprises a first pressing plate (81) and a second pressing plate (82); The first pressure plate (81) is fixed on the inner side of the second housing (63) and is used to fix the outer ring of the second bearing (4); the second pressure plate (82) is fixed on the planet carrier (2) and is used to fix the inner ring of the second bearing (4).

9. The transmission structure according to claim 6, characterized in that: A planetary gear and a sun gear are arranged in the planetary carrier (2); the sun gear is colinear with the axis of the main shaft (1); and the ring gear (62) meshes with the sun gear through the planetary gear.

10. The transmission structure according to any one of claims 1 to 9, characterized in that: The first bearing (3) is a double-row tapered roller bearing, and the second bearing (4) is a cylindrical roller bearing with no ribs on the inner ring.

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