Bearing mounting structure for input shaft of high-power wind power gearbox

Abstract

The utility model discloses a bearing mounting structure for an input shaft of a high-power wind power gearbox. A tensioning sleeve assembly is fixedly arranged in a hollow cavity in the input shaft of the wind power gearbox; the tensioning sleeve assembly comprises an outer tensioning sleeve and an inner tensioning sleeve, the outer tensioning sleeve and the inner tensioning sleeve are of an annular structure with matched conical surfaces, and the inner tensioning sleeve is arranged in the outer tensioning sleeve and fixedly connected with the outer tensioning sleeve through a locking bolt; when the locking bolt is screwed down, the inner tensioning sleeve moves in the outer tensioning sleeve along the axis, the outer circle diameter of the outer tensioning sleeve is increased by being matched with the conical surface, the outer tensioning sleeve abuts against the wall of a hollow cavity of the input shaft of the wind power gearbox, and the outer circle diameter of the input shaft of the wind power gearbox is forced to be increased. Therefore, the interference fit amount between the input shaft of the electric gearbox and the bearing inner sleeve is increased, the interference fit force between the input shaft of the wind power gearbox and the bearing inner sleeve is improved, and the technical problem of relative friction rotation caused by insufficient interference amount between the bearing inner sleeve and the input shaft of the wind power gearbox is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of the assembly connection between the input shaft and the bearing of a wind turbine gearbox, and particularly relates to an installation structure of an input shaft bearing of a high-power wind power gearbox. Background Technique

[0002] With the rapid improvement of domestic wind power generation equipment technology, the power of wind turbines is also getting larger and larger. Currently, the maximum power of offshore wind power experimental units has reached up to 24 megawatts. Therefore, the diameter of the input shaft of the wind power gearbox of the wind turbine is also getting larger. If the original thick-wall structure design is still adopted for the input shaft of the wind power gearbox, it will inevitably lead to an excessive weight of the wind power gearbox. To solve this problem, an optimized structural design of the input shaft of the wind power gearbox is carried out. By increasing the outer diameter of the input shaft of the wind power gearbox and simultaneously reducing the wall thickness of the input shaft of the wind power gearbox, while ensuring the strength and torque transmission of the input shaft of the wind power gearbox, reducing the weight of the input shaft of the wind power gearbox becomes a better design scheme.

[0003] However, after the input shaft of the wind power gearbox adopts a thin-wall structure design, when the inner sleeve of the bearing assembled on the input shaft of the wind power gearbox keeps the original interference fit clearance unchanged, due to the thinning of the wall thickness of the input shaft of the wind power gearbox, the radial shrinkage deformation amount of the input shaft of the wind power gearbox after actual assembly will become larger, resulting in a decrease in the interference fit force between the input shaft of the wind power gearbox and the inner sleeve of the bearing. In the initial stage of the operation of the wind turbine, the influence of the decrease in this interference fit force is not obvious. However, as the operation time of the wind turbine increases and is affected by the change of environmental temperature, the interference fit force between the input shaft of the wind power gearbox and the inner sleeve of the bearing will gradually decrease, resulting in relative frictional rotation between the inner sleeve of the bearing and the input shaft of the wind power gearbox, thus greatly threatening the operation safety of the wind turbine.

[0004] Theoretically, increasing the local wall thickness of the input shaft of the wind power gearbox in the bearing installation section or increasing the interference fit amount between the input shaft of the electric gearbox and the inner sleeve of the bearing can solve this problem. However, since the input shaft of the wind power gearbox is a casting, too large an increase in the local wall thickness will lead to casting defects in the input shaft of the wind power gearbox, and increasing the interference fit amount between the input shaft of the electric gearbox and the inner sleeve of the bearing will lead to difficult assembly between the input shaft of the gearbox and the inner sleeve of the bearing. Therefore, how to solve the relative frictional rotation caused by insufficient interference fit force between the input shaft of the high-power wind power gearbox and the inner sleeve of the bearing has become a technical problem that must be solved for high-power wind turbines. Content of the Utility Model

[0005] In order to overcome the deficiencies in the background art, the utility model discloses an installation structure for the input shaft bearing of a high-power wind power gearbox. By fixedly arranging a tension sleeve assembly in the internal hollow cavity of the input shaft of the wind power gearbox, the outer diameter of the input shaft of the wind power gearbox expands at the bearing installation position section, thereby achieving the technical effect of improving the interference fit force between the input shaft of the wind power gearbox and the inner sleeve of the bearing.

[0006] In order to achieve the purpose of the utility model, the following technical solutions are adopted: An installation structure for the input shaft bearing of a high-power wind power gearbox includes an input shaft of the wind power gearbox and a bearing. The input shaft of the wind power gearbox is a hollow cylindrical structure, and the bearing is fixedly arranged on the outer circumferential surface of the input shaft of the wind power gearbox; relative to the position of the bearing arranged in the axial direction on the input shaft of the wind power gearbox, a tension sleeve assembly is fixedly arranged in the internal hollow cavity of the input shaft of the wind power gearbox; the tension sleeve assembly makes the outer diameter of the input shaft of the wind power gearbox at the bearing installation position section expand, ensuring that the input shaft of the wind power gearbox and the inner sleeve of the bearing are always in an interference fit state.

[0007] Further, the tension sleeve assembly includes an outer tension sleeve and an inner tension sleeve, and both the outer tension sleeve and the inner tension sleeve are annular structures; the inner tension sleeve is arranged in the outer tension sleeve, and the mating surface is a conical surface; the inner tension sleeve and the outer tension sleeve are fixedly connected by locking bolts.

[0008] Further, the maximum wall thickness of the inner tension sleeve is 18 - 20 times the minimum wall thickness of the outer tension sleeve.

[0009] Further, an outer tension sleeve edge is provided at the small aperture end of the inner conical surface of the outer tension sleeve; a plurality of bolt through holes are evenly distributed on the outer tension sleeve edge; a plurality of locking bolt holes are evenly distributed at the end of the inner tension sleeve adjacent to the outer tension sleeve edge; the positions of the bolt through holes and the locking bolt holes correspond to each other.

[0010] Further, a plurality of disassembly bolt holes are also evenly distributed on the outer tension sleeve edge

[0011] Preferably, a boss is provided at the end of the inner tension sleeve adjacent to the outer tension sleeve edge, and the conical surface fit is between the outer circle of the boss and the inner circle of the outer tension sleeve edge; after the tension sleeve assembly is locked, the outer tension sleeve edge is flush with the boss.

[0012] Further, a plurality of process thread holes for installation are provided on the end face of the inner tension sleeve adjacent to the outer tension sleeve edge, or on the boss end face of the inner tension sleeve.

[0013] Due to the above-described technical solution, the utility model has the following beneficial effects: A mounting structure for the input shaft bearing of a high-power wind power gearbox disclosed by the utility model fixedly arranges a tension sleeve assembly including an outer tension sleeve and an inner tension sleeve in the internal hollow cavity of the input shaft of the wind power gearbox; the outer tension sleeve and the inner tension sleeve are annular structures with a conical surface fit, the inner tension sleeve is arranged in the outer tension sleeve and is fixedly connected through a locking bolt; when the locking bolt is tightened, the inner tension sleeve moves along the axis in the outer tension sleeve, and the outer diameter of the outer tension sleeve expands through the cooperation of the conical surface. The expansion of the outer diameter of the outer tension sleeve abuts against the inner wall of the hollow cavity of the input shaft of the wind power gearbox, forcing the outer diameter of the input shaft of the wind power gearbox to expand, thereby increasing the interference fit amount between the input shaft of the electric gearbox and the inner sleeve of the bearing, improving the interference fit force between the input shaft of the wind power gearbox and the inner sleeve of the bearing, and solving the technical problem of relative friction rotation between the inner sleeve of the bearing and the input shaft of the wind power gearbox due to insufficient interference fit force. Brief Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the appearance of the mounting structure for the input shaft bearing of a high-power wind power gearbox;

[0015] Figure 2 It is a schematic diagram of the sectional structure of the mounting structure for the input shaft bearing of a high-power wind power gearbox;

[0016] Figure 3 It is a schematic diagram of the appearance of the tension sleeve assembly;

[0017] Figure 4 It is an exploded schematic diagram of the structure of the tension sleeve assembly in Embodiment 1;

[0018] Figure 5 It is a schematic diagram of the sectional structure of the tension sleeve assembly in Embodiment 1;

[0019] Figure 6 It is an exploded schematic diagram of the structure of the tension sleeve assembly in Embodiment 2;

[0020] Figure 7 It is a schematic diagram of the sectional structure of the tension sleeve assembly in Embodiment 2.

[0021] In the figure: 1. Input shaft of the wind power gearbox; 2. Bearing; 2.1 Inner sleeve of the bearing; 3. Tension sleeve assembly; 3.1 Outer tension sleeve; 3.1.1 Flange of the outer tension sleeve; 3.1.2 Bolt through-hole; 3.1.3 Disassembly bolt hole; 3.2 Inner tension sleeve; 3.2.1 Locking bolt hole; 3.2.2 Process thread hole; 3.3 Locking bolt. Detailed Description of the Preferred Embodiments

[0022] The following embodiments can be used to explain the utility model in detail. The purpose of disclosing the utility model is to protect all technical improvements within the scope of the utility model.

[0023] See the attached drawings of the specification Figure 1 and 2 : A mounting structure for the input shaft bearing of a high-power wind power gearbox, comprising a wind power gearbox input shaft 1 and a bearing 2. The wind power gearbox input shaft 1 is a hollow cylindrical structure, and the bearing 2 is fixedly arranged on the outer circumferential surface of the wind power gearbox input shaft 1. An interference fit exists between the inner bearing sleeve 2.1 of the bearing 2 and the outer circumferential surface of the wind power gearbox input shaft 1. In the axial mounting position of the wind power gearbox input shaft 1 relative to the inner bearing sleeve 2.1, a shrink disc assembly 3 is fixedly arranged in the internal hollow cavity of the wind power gearbox input shaft 1. The shrink disc assembly 3 causes the outer diameter of the position section of the wind power gearbox input shaft 1 where the bearing 2 is installed to expand, thereby increasing the interference fit amount between the wind power gearbox input shaft 1 and the inner bearing sleeve 2.1, ensuring that the wind power gearbox input shaft 1 and the inner bearing sleeve 2.1 are always in an interference fit state, and improving the interference fit force between the wind power gearbox input shaft 1 and the inner bearing sleeve 2.1, thus solving the technical problem of relative frictional rotation between the inner bearing sleeve and the wind power gearbox input shaft due to insufficient interference fit force.

[0024] See the attached drawings of the specification Figure 3 and 4 5: Further, the shrink disc assembly 3 includes an outer shrink disc 3.1 and an inner shrink disc 3.2. Both the outer shrink disc 3.1 and the inner shrink disc 3.2 are annular structures. The inner shrink disc 3.2 is arranged in the outer shrink disc 3.1, and the mating surface is a conical surface. The inner shrink disc 3.2 and the outer shrink disc 3.1 are fixedly connected by a locking bolt 3.3. When the locking bolt 3.3 is tightened, the inner shrink disc 3.2 moves along the axis in the outer shrink disc 3.1, and the outer diameter of the outer shrink disc 3.1 expands through the mating conical surface. The expansion of the outer diameter of the outer shrink disc 3.1 abuts against the inner wall of the hollow cavity of the wind power gearbox input shaft 1, forcing the outer diameter of the wind power gearbox input shaft 1 to expand.

[0025] Further, the inner shrink disc 3.2 is designed as an annular structure to reduce the overall structural weight of the shrink disc assembly 3. The maximum wall thickness of the inner shrink disc 3.2 is designed to be 18 - 20 times the minimum wall thickness of the outer shrink disc 3.1 to ensure that when the locking bolt 3.3 is tightened and the inner shrink disc 3.2 moves along the axis in the outer shrink disc 3.1, the outer diameter of the outer shrink disc 3.1 can undergo reliable expansion deformation.

[0026] Further, an outer tightening sleeve edge 3.1.1 is provided at the small aperture end of the inner conical surface of the outer tightening sleeve 3.1; 24 bolt through-holes 3.1.2 are evenly distributed on the outer tightening sleeve edge 3.1.1, and the bolt through-holes 3.1.2 are smooth holes; 24 locking bolt holes 3.2.1 are evenly distributed at the adjacent end of the inner tightening sleeve 3.2 and the outer tightening sleeve edge 3.1.1, and the locking bolt holes 3.2.1 are threaded holes. The positions of the bolt through-holes 3.1.2 and the locking bolt holes 3.2.1 correspond to each other; the inner tightening sleeve 3.2 is arranged in the outer tightening sleeve 3.1, and the locking bolt 3.3 passes through the bolt through-hole 3.1.2 and is meshed and connected with the locking bolt hole 3.2.1; before the tightening sleeve assembly 3 is arranged in the inner hollow cavity of the input shaft 1 of the wind power transmission gearbox, the locking bolt 3.3 is in a non-tightened state. At this time, there is a clearance fit between the outer circular surface of the outer tightening sleeve 3.1 and the inner wall of the cavity of the input shaft 1 of the wind power transmission gearbox, and the tightening sleeve assembly 3 can be easily placed into the cavity of the input shaft 1 of the wind power transmission gearbox; when swell tighten After the sleeve assembly 3 is arranged in the inner hollow cavity of the input shaft 1 of the wind power transmission gearbox, by tightening the locking bolt 3.3, the inner tightening sleeve 3.2 moves along the axis in the outer tightening sleeve 3.1. Through the cooperation of the conical surface, the outer diameter of the outer tightening sleeve 3.1 expands. After the outer diameter of the outer tightening sleeve 3.1 expands, it abuts against the inner wall of the hollow cavity of the input shaft 1 of the wind power transmission gearbox, forcing the outer diameter of the input shaft 1 of the wind power transmission gearbox to expand.

[0027] Further, 6 disassembly bolt holes 3.1.3 are evenly distributed on the outer tightening sleeve edge 3.1.1, and the disassembly bolt holes 3.1.3 are threaded holes for disassembling the tightening sleeve assembly 3; when the tightening sleeve assembly 3 needs to be disassembled, the locking bolt 3.3 is loosened in sequence to separate the inner tightening sleeve 3.2 from the outer tightening sleeve 3.1; if the inner tightening sleeve 3.2 and the outer tightening sleeve 3.1 are self-locked and cannot be normally separated after the locking bolt 3.3 is loosened, then a disassembly bolt is screwed into the 6 disassembly bolt holes 3.1.3, and the end of the disassembly bolt abuts against the adjacent end of the inner tightening sleeve 3.2 and the outer tightening sleeve edge 3.1.1, and the inner tightening sleeve 3.2 is pushed out of the outer tightening sleeve 3.1.

[0028] Preferably, a convex platform is provided at the adjacent end of the inner tightening sleeve 3.2 and the outer tightening sleeve edge 3.1.1, and there is a conical surface fit between the outer circle of the convex platform and the inner circle of the outer tightening sleeve edge 3.1.1; after the tightening sleeve assembly 3 is locked, the end surface of the outer tightening sleeve edge 3.1.1 is flush with the end surface of the convex platform.

[0029] Further, several installation process threaded holes are provided on the adjacent end surface of the inner tightening sleeve 3.2 and the outer tightening sleeve edge 3.1.1, or on the convex platform end surface of the inner tightening sleeve 3.2; through the process threaded holes, installation tooling can be fixed to assist in the assembly and lifting of the tightening sleeve assembly 3, or to assist in the installation of the tightening sleeve assembly 3 in the input shaft 1 of the wind power transmission gearbox. Example 1:

[0030] See the appended description Figure 1 、 2 : A mounting structure for the input shaft bearing of a high-power wind power gearbox, including the input shaft 1 of the wind power gearbox and the bearing 2. The input shaft 1 of the wind power gearbox is a hollow cylindrical structure, and the inner bearing sleeve 2.1 of the bearing 2 is fixedly arranged on the outer circumferential surface of the input shaft 1 of the wind power gearbox;

[0031] See the appended description Figure 3 、 4 、5: The expansion sleeve assembly 3 includes an outer expansion sleeve 3.1 and an inner expansion sleeve 3.2. Both the outer expansion sleeve 3.1 and the inner expansion sleeve 3.2 are annular structures. The inner expansion sleeve 3.2 is arranged in the outer expansion sleeve 3.1, and the mating surface is a conical surface; on the small-diameter end of the inner conical surface of the outer expansion sleeve 3.1, there is an outer expansion sleeve retaining edge 3.1.1, and 24 bolt through-holes 3.1.2 are evenly distributed on the outer expansion sleeve retaining edge 3.1.1; on the end adjacent to the outer expansion sleeve retaining edge 3.1.1 of the inner expansion sleeve 3.2, 24 locking bolt holes 3.2.1 are evenly distributed, and the positions of the bolt through-holes 3.1.2 and the locking bolt holes 3.2.1 correspond to each other; the locking bolts 3.3 pass through the bolt through-holes 3.1.2 of the outer expansion sleeve 3.1 and are meshed and connected with the locking bolt holes 3.2.1 of the inner expansion sleeve 3.2 to connect the outer expansion sleeve 3.1 and the inner expansion sleeve 3.2 into an integral structure; 6 disassembly bolt holes 3.1.3 are also evenly distributed on the outer expansion sleeve retaining edge 3.1.1, and several process thread holes 3.2.2 are also provided on the end face of the inner expansion sleeve 3.2 adjacent to the outer expansion sleeve retaining edge 3.1.1; in this embodiment, the outer diameter of the outer expansion sleeve 3.1 is 1300 mm, the minimum wall thickness is 20 mm, the maximum wall thickness of the inner expansion sleeve 3.2 is 378 mm, and the maximum wall thickness of the inner expansion sleeve 3.2 is 18.9 times the minimum wall thickness of the outer expansion sleeve 3.1;

[0032] Before the expansion sleeve assembly 3 is assembled in the internal hollow cavity of the input shaft 1 of the wind power gearbox, first complete the assembly of the input shaft 1 of the wind power gearbox and the bearing 2; then fixedly install the assembly tooling on the expansion sleeve assembly 3 through the process thread holes 3.2.2, and use a forklift to set the expansion sleeve assembly 3 in the internal hollow cavity of the input shaft 1 of the wind power gearbox through the assembly tooling, and its position corresponds to the inner bearing sleeve 2.1; then use two torque wrenches to pre-tighten two symmetrically distributed locking bolts 3.3 at 1 / 2 of the set maximum torque, in a clockwise or counterclockwise order in turn until all the locking bolts 3.3 are pre-tightened; withdraw the forklift and remove the assembly tooling; continue to use two torque wrenches to tighten all the locking bolts 3.3 in the same way with the set maximum torque; after the installation of the expansion sleeve assembly 3 is completed, judge whether the installation of the expansion sleeve assembly 3 is qualified by measuring whether the error of the distance between the outer expansion sleeve retaining edge 3.1.1 and the adjacent end face of the inner expansion sleeve 3.2 at several positions is within the range of + / -0.5 mm. Embodiment 2:

[0033] The difference between this embodiment and Embodiment 1 is that: a convex platform is provided at the adjacent end of the inner tightening sleeve 3.2 and the outer tightening sleeve flange 3.1.1, and the outer circle of the convex platform and the inner circle of the outer tightening sleeve flange 3.1.1 are in conical surface fit; after the installation of the tightening sleeve assembly 3 is completed, it is judged whether the installation of the tightening sleeve assembly 3 is qualified by measuring whether the height difference between the outer tightening sleeve flange 3.1.1 and the convex platform at several positions is within the range of + / -0.5 mm.

[0034] The parts not described in detail in the present utility model are prior art.

[0035] Those skilled in the art should understand that those skilled in the art can achieve variation examples in combination with the prior art and the above embodiments. Such variation examples do not affect the essence of the present solution and will not be elaborated herein.

[0036] It should be understood that the present solution is not limited to the above specific implementation manners. The equipment and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art, without departing from the scope of the technical solution of the present solution, can make many possible changes and modifications to the technical solution of the present solution by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of the present solution. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present solution without departing from the content of the technical solution of the present solution still belong to the scope of protection of the technical solution of the present solution.

Claims

1. An installation structure of an input shaft bearing of a high-power wind power gearbox, comprising an input shaft (1) of a wind power gearbox and a bearing (2). The input shaft (1) of the wind power gearbox is a hollow cylindrical structure, and the bearing (2) is fixedly arranged on the outer circumferential surface of the input shaft (1) of the wind power gearbox. It is characterized in that: The relative bearing (2) is arranged in the axial direction on the input shaft (1) of the wind power gearbox. A shrink disc assembly (3) is fixedly arranged in the inner hollow cavity of the input shaft (1) of the wind power gearbox; the shrink disc assembly (3) expands the outer diameter of the position section of the input shaft (1) of the wind power gearbox where the bearing (2) is installed, ensuring that the input shaft (1) of the wind power gearbox and the inner ring of the bearing (2.1) are always in an interference fit state.

2. The installation structure of the input shaft bearing of the high-power wind power gearbox according to claim 1, characterized in that: The shrink disc assembly (3) includes an outer shrink disc (3.1) and an inner shrink disc (3.2). Both the outer shrink disc (3.1) and the inner shrink disc (3.2) are of annular structure; the inner shrink disc (3.2) is arranged in the outer shrink disc (3.1), and the mating surface is a conical surface; the inner shrink disc (3.2) and the outer shrink disc (3.1) are fixedly connected by locking bolts (3.3).

3. The installation structure of the input shaft bearing of the high-power wind power gearbox according to claim 2, characterized in that: The maximum wall thickness of the inner shrink disc (3.2) is 18 - 20 times the minimum wall thickness of the outer shrink disc (3.1).

4. The installation structure of the input shaft bearing of the high-power wind power gearbox according to claim 2, characterized in that: On the small-diameter end of the inner conical surface of the outer shrink disc (3.1), there is an outer shrink disc edge (3.1.1); several bolt through-holes (3.1.2) are evenly distributed on the outer shrink disc edge (3.1.1); several locking bolt holes (3.2.1) are evenly distributed on the adjacent end of the inner shrink disc (3.2) and the outer shrink disc edge (3.1.1); the positions of the bolt through-holes (3.1.2) and the locking bolt holes (3.2.1) correspond to each other.

5. The installation structure of the input shaft bearing of the high-power wind turbine gearbox according to claim 2, characterized in that: Several disassembly bolt holes (3.1.3) are also evenly distributed on the outer shrink disc edge (3.1.1).

6. The installation structure of the input shaft bearing of the high-power wind power gearbox according to claim 2 is characterized in that: the inner The adjacent end of the shrink disc (3.2) and the outer shrink disc edge ( 3.1.1) is a conical surface fit between the outer circle of the boss and the inner circle of the outer shrink disc edge.

7. The installation structure of the input shaft bearing of the high-power wind power gearbox according to claim 2 or 6, characterized in that: the inner On the adjacent end face of the shrink disc (3.2) and the outer shrink disc edge (3.1.1), or on the boss end face of the inner shrink disc (3.2), several assembly process threaded holes (3.2.2) are provided.

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