Gearbox center shaft for wind power generation equipment
By introducing a connecting shaft into the gearbox center shaft of wind power generation equipment, the spline structure is eliminated, the lubricating structure is simplified, the problem of complex structure of the gearbox center shaft is solved, and a simpler, lighter and lower cost design is achieved .
Patent Information
- Application Number
- CN202310960186.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-01
- Publication Date
- 2025-02-14
AI Technical Summary
The central shaft structure of the gearbox of wind power equipment is complex, and spline structure and lubrication structure are required, which increases the difficulty of design and manufacturing.
By introducing a connecting shaft into the gearbox central axis, the sun shaft and the output shaft transmit torque through the connecting shaft, canceling the spline structure, simplifying the lubricating structure, and using an elastic neck and a thickness reduction part to achieve torque transmission and structural connection.
The structure of the gearbox center shaft is simplified, reducing weight and cost, while reducing manufacturing complexity, enabling a simpler, lighter and lower cost design.
Smart Images
Figure CN119435699A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a shaft, in particular to a gear box central shaft for wind power generation equipment. Background Art
[0002] The main shaft of the wind power generation equipment drives the generator through a planetary speed-increasing gearbox. The main shaft of the wind power generation equipment provides a low-speed, high-torque rotation input to the gearbox. After the gearbox speeds up and reduces the torque, the gearbox provides a high-speed, low-torque rotation output to the generator. The central shaft of the gearbox includes a sun shaft driven to rotate by the sun gear. The central shaft of the gearbox also includes an output shaft, which drives the output gear to rotate, and then drives the output shaft of the gearbox connected to the main shaft of the generator to rotate. The sun shaft engages the output shaft through a spline to drive the output shaft to rotate. The central shaft of the gearbox needs to be provided with a lubrication structure to lubricate the splines, and the structure is complex. Summary of the invention
[0003] The object of the present invention is to provide a gearbox central shaft for a wind power generation device, so as to improve the complex structure of the gearbox central shaft.
[0004] According to an embodiment of the present invention, the central shaft of the gearbox includes a sun shaft, an output shaft and a connecting shaft; the sun shaft is configured to connect to the sun gear and be driven to rotate by the sun gear; the output shaft is configured to connect to and drive the output gear to rotate; the connecting shaft includes a sun shaft connecting portion, a middle section and an output shaft connecting portion, the sun shaft connecting portion is connected to the sun shaft at one axial end of the connecting shaft and is elastically connected to the middle section, and the output shaft connecting portion is connected to the output shaft at the other axial end of the connecting shaft and is elastically connected to the middle section.
[0005] In one or more embodiments, the connecting shaft also includes an elastic neck, and the sun shaft connecting part and the output shaft connecting part are respectively connected to the middle section through the elastic neck; the elastic neck includes a bend, which extends from a first end and bends to a second end, the first end is fixed to the middle section, and the second end is connected to the sun shaft connecting part or the output shaft connecting part, and the thickness of the bend is less than the thickness of the middle section.
[0006] In one or more embodiments, the bend extends from the first end and bends 90 degrees to the second end.
[0007] In one or more embodiments, the elastic neck further includes a thickness reducing portion, which extends from the middle section to the first end of the bend, and the thickness of the thickness reducing portion gradually decreases from the middle section to the first end of the bend.
[0008] In one or more embodiments, the thickness of the bent portion is the thickness at the first end where the reduced thickness portion is connected to the bent portion.
[0009] In one or more embodiments, the sun shaft connection portion includes a flange, and the flange is bolted to the axial end surface of the sun shaft.
[0010] In one or more embodiments, the sun shaft connection portion includes a side enclosure, which is located at the outer periphery of the sun shaft and fits the outer peripheral surface of the sun shaft.
[0011] In one or more embodiments, the output shaft connection portion includes a flange, and the flange is bolted to an end face of the output shaft.
[0012] In one or more embodiments, the output shaft connecting portion includes a bearing mounting groove, which protrudes toward the outer circumference of the output shaft to fit an inner ring of a bearing supporting the output shaft.
[0013] In one or more embodiments, the bearing mounting groove includes an outer peripheral wall and an axial end wall connected to each other, the outer peripheral wall is configured to support the inner peripheral surface of the bearing inner ring, and the axial end wall is configured to fit the axial end surface of the bearing inner ring.
[0014] The embodiments of the present invention have at least the following beneficial effects:
[0015] The sun shaft drives the output shaft to rotate through the connecting shaft. The sun shaft and the output shaft do not need to be provided with a spline structure to transmit torque. The central shaft of the gearbox does not need to be provided with a spline lubrication structure such as a lubrication oil channel, a spline oil bag, and an oil retaining ring. The structure is simpler, the weight is lighter, and the cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:
[0017] Figure 1 It is a cross-sectional view of the central axis of the gearbox;
[0018] Figure 2 It is a cross-sectional view of the deformation of the connecting shaft;
[0019] Reference numerals:
[0020] 1- gearbox center shaft;
[0021] 2-sun axis;
[0022] 3- output shaft;
[0023] 4-Connecting shaft;
[0024] 5-Sun gear;
[0025] 6-Output gear;
[0026] 7-sun shaft connection part;
[0027] 8-middle section;
[0028] 9- output shaft connection part;
[0029] 10- first flange;
[0030] 11-side circumference;
[0031] 12- second flange;
[0032] 13-bearing mounting groove;
[0033] 14- bearing;
[0034] 15-bearing inner ring;
[0035] 16- peripheral wall;
[0036] 17- shaft end wall;
[0037] 18-Elastic neck;
[0038] 19-bend;
[0039] 20-first end;
[0040] 21 - second end;
[0041] 22-thickness reduction portion;
[0042] 23-Thickness reduction surface. DETAILED DESCRIPTION
[0043] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided to explain the present invention, not to limit the present invention. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature illustrated or described as part of one embodiment may be used together with another embodiment to produce yet another embodiment. Therefore, the present invention is intended to cover these modifications and variations within the scope of the appended claims and their equivalents.
[0044] It should be noted that these and other subsequent drawings are only examples and are not drawn to scale, and should not be used to limit the actual scope of protection required by the present invention.
[0045] The terms "first", "second", etc. may be used interchangeably to distinguish one feature from another, and are not intended to mean that each feature must be located as shown in the figures in each embodiment.
[0046] like Figure 1As shown, the gearbox central shaft 1 includes a sun shaft 2 , an output shaft 3 and a connecting shaft 4 .
[0047] like Figure 1 As shown, the sun shaft 2 is the core shaft of the sun gear 5, connected to the sun gear 5 and can rotate together. The sun gear 5 can form a planetary gear train (not shown in the figure) with planetary gears, ring gears, etc. The sun gear 5 is the output gear of the planetary gear train, and the sun shaft 2 is the output shaft of the planetary gear train. The main shaft of the wind power generation equipment (not shown in the figure) provides a low-speed, high-torque rotation input to the planetary gear train, drives the sun gear 5 to rotate, and the sun gear 5 drives the sun shaft 2 to rotate.
[0048] like Figure 1 As shown, the output shaft 3 is the core shaft of the output gear 6, which is connected to the output gear 6 and can rotate together. The core of the output shaft 3 is hollow, also known as a hollow shaft. The output gear 6 can form a speed-increasing gear set (not shown in the figure) with other gears. The output gear 6 is the input gear of the speed-increasing gear set, and the output shaft 3 is the input shaft of the speed-increasing gear set. The core shaft of the final gear in the speed-increasing gear set is the gearbox output shaft (not shown in the figure) connected to the main shaft of the generator. The output shaft 3 provides a low-speed, high-torque rotation input to the speed-increasing gear set, driving the output gear 6 to rotate. The output gear 6 drives the final gear in the speed-increasing gear set to rotate, thereby driving the main shaft of the generator to rotate.
[0049] like Figure 1 As shown, the connecting shaft 4 includes a sun shaft connecting portion 7, a middle section 8 and an output shaft connecting portion 9. The sun shaft connecting portion 7 is located at one axial end of the connecting shaft 4 and is connected to the sun shaft 2. The output shaft connecting portion 9 is located at the other axial end of the connecting shaft 4 and is connected to the output shaft 3. The torque of the sun shaft 1 is transmitted to the output shaft 3 through the connecting shaft 4, and the sun shaft 1 drives the output shaft 3 to rotate through the connecting shaft 4, and the sun shaft 2, the connecting shaft 4 and the output shaft 3 rotate together. The sun shaft 2 and the output shaft 3 do not need to be provided with a spline structure to transmit torque, and the central shaft 1 of the gearbox does not need to be provided with a spline lubrication structure such as a lubricating oil channel, a spline oil bag, and an oil retaining ring, so the structure is simpler, the weight is lighter, and the cost is lower.
[0050] If a spline structure is provided, the output shaft 3 needs to be forged and nitrided so that the surface of the output shaft 3 meets the requirements for processing the spline. In the embodiment of the present application, since there is no need to provide a spline structure to transmit torque, the output shaft 3 can be made by casting, which is lower in cost and lighter in weight.
[0051] If the torque is transmitted through the spline structure, the sun shaft 2 needs to extend to the inner circumference of the output shaft 3 so that the splines on the outer circumference of the sun shaft 2 mesh with the splines on the inner circumference of the output shaft 3. In the embodiment of the present application, the sun shaft 2 is axially connected to the output shaft 3 through the connecting shaft 4. The sun shaft 2 and the connecting shaft 4 extend to the axial end of the output shaft 3, and do not need to extend to the inner circumference of the output shaft 3. The length is shorter, and the connecting shaft 4 can be made by casting, which makes the gearbox center shaft 1 lighter and the cost lower.
[0052] like Figure 1 As shown, the central axis of the middle section 8 is the central axis of the connecting shaft 4. The sun shaft connecting part 7 is elastically connected to the middle section 8, and the output shaft connecting part 9 is elastically connected to the middle section 8. Whether the connecting shaft 4 is deformed is affected by the relative positions of the sun shaft 2 and the output shaft 3. If the central axes of the sun shaft 2 and the output shaft 3 coincide, the connecting shaft 4 will not be deformed, the sun shaft connecting part 7 is perpendicular to the central axis of the middle section 8, and the central axis of the sun shaft connecting part 7 coincides with the central axis of the middle section 8, and the output shaft connecting part 9 is perpendicular to the central axis of the middle section 8, and the central axis of the output shaft connecting part 9 coincides with the central axis of the middle section 8. If the central axes of the sun shaft 2 and the output shaft 3 do not coincide, the connecting shaft 4 is deformed, and the output shaft connecting part 9 can be deflected relative to the central axis of the middle section 8, so that the central axis of the output shaft connecting part 9 deflects relative to the central axis of the middle section 8, and / or, the sun shaft connecting part 7 can be deflected relative to the central axis of the middle section 8, so that the central axis of the sun shaft connecting part 7 deflects relative to the central axis of the middle section 8, to compensate for the non-coincidence of the central axis of the output shaft 3 with the central axis of the sun shaft 2, such as angular misalignment. As Figure 2 As shown, the center axis of the sun shaft 2 drawn by the solid line coincides with the center axis of the output shaft 3, and the connecting shaft 4 drawn by the solid line is not deformed. The sun shaft 2 drawn by the dotted line is offset downward in the figure relative to the sun shaft 2 drawn by the solid line, the center axis of the sun shaft 2 drawn by the dotted line does not coincide with the center axis of the output shaft 3, the connecting shaft 4 drawn by the dotted line is deformed, the middle section 8 is deflected downward in the figure relative to the output shaft connecting part 9, so that the center axis of the middle section 8 is deflected downward in the figure relative to the center axis of the output shaft connecting part 9, and the sun shaft connecting part 7 is deflected downward in the figure relative to the middle section 8, so that the center axis of the sun shaft connecting part 7 is deflected downward in the figure relative to the center axis of the middle section 8, thereby compensating for the offset of the sun shaft 2 relative to the output shaft 3 downward in the figure.
[0053] like Figure 1As shown, the sun shaft connection part 7 may include a first flange 10, and the first flange 10 is bolted to the axial end face of the sun shaft 2, and the structure is simple and reliable. The axial end face of the first flange 10 can be in contact with the axial end face of the sun shaft 2, and the threaded fastener can pass through the first flange 10 axially and screw into the threaded hole of the axial end face of the sun shaft 2 and lock it. The threaded fastener can be a screw and a friction gasket, or a hinged bolt composed of a pin and a bolt, or a smart bolt including a sensor so as to have stress collection and monitoring functions. In another embodiment, the sun shaft connection part 7 may include a coupling, and the sun shaft 2 is connected through the coupling. In another embodiment, the sun shaft connection part 7 and the sun shaft 2 may be provided with a meshing member, and the sun shaft connection part 7 is meshed and connected to the sun shaft 2, and the meshing member can be, for example, a fixed spline or a rack. In another embodiment, the sun shaft connection part 7 is welded to the sun shaft 2.
[0054] like Figure 1 As shown, the sun shaft connection part 7 may include a side enclosure 11, which is located at the outer periphery of the sun shaft 2 and fits the outer peripheral surface of the sun shaft 2 to achieve radial positioning of the sun shaft connection part 7 and the sun shaft 2. The side enclosure 11 may be an annular protruding wall, which protrudes from the axial end surface of the first flange 10 toward the sun shaft 2 in the axial direction.
[0055] like Figure 1 As shown, the output shaft connection part 9 may include a second flange 12, and the second flange 12 is bolted to the axial end face of the output shaft 3, and the structure is simple and reliable. The axial end face of the second flange 12 can be in contact with the axial end face of the output shaft 3, and the threaded fastener can pass through the second flange 12 in the axial direction and be screwed into the threaded hole of the axial end face of the output shaft 3 and locked. The threaded fastener can be a screw and a friction washer, or a hinge bolt composed of a pin and a bolt.
[0056] like Figure 1 As shown, the output shaft connection portion 9 may include a bearing installation groove 13, which protrudes toward the outer periphery of the output shaft 3 to fit the inner ring 15 of the bearing 14 supporting the output shaft 3, so as to achieve radial and axial positioning of the bearing 14. The bearing installation groove 13 may protrude radially outward from the second flange 12, protrude radially out of the outer peripheral surface of the output shaft 3, and the bearing installation groove 13 is installed and matched with the portion of the bearing inner ring 15 protruding axially out of the axial end surface of the output shaft 3.
[0057] like Figure 1As shown, the bearing installation groove 13 may include an outer peripheral wall 16 and an axial end wall 17 connected to each other. The outer peripheral wall 16 supports the inner peripheral surface of the bearing inner ring 15, and the inner peripheral surface of the bearing inner ring 15 that protrudes axially from the axial end surface of the output shaft 3 is supported on the outer peripheral wall 16, so as to achieve the fixed position of the bearing 14 in the radial direction. The axial end wall 17 fits the axial end surface of the bearing inner ring 15, and the part of the axial end surface of the bearing inner ring 15 close to the radial inner side fits the axial end wall 17, so as to achieve the fixed position of the bearing 14 in the axial direction. The outer peripheral wall 16 can be provided by the outer peripheral surface of the second flange 12, and the axial end wall 17 can protrude radially outward from the outer peripheral surface of the second flange 12.
[0058] like Figure 1 As shown, the connecting shaft 4 may also include an elastic neck 18, and the sun shaft connecting part 7 and the output shaft connecting part 9 are respectively connected to the middle section 8 through the elastic neck 18, so as to realize the aforementioned elastic connection between the sun shaft connecting part 7, the output shaft connecting part 9 and the middle section 8. The elastic neck 18 may be a rotating part, and the elastic neck 18 includes a bend 19, and the thickness of the bend 19 is less than the thickness of the middle section 8. The thinning of the thickness improves the elasticity of the bend 19, and the bend 19 extends from the first end 20 and bends to the second end 21. The shape of the bend 19 improves its elasticity, and the first end 20 and the second end 21 have the ability to change and restore relative positions, wherein the first end 20 is fixed to the middle section 8, and the second end 21 is connected to the sun shaft connecting part 7 or the output shaft connecting part 9, so that the sun shaft connecting part 7 or the output shaft connecting part 9 can change and restore relative positions of the middle section 8, so as to realize the aforementioned elastic connection.
[0059] like Figure 1 As shown in the figure, the bend 19 can extend from the first end 20 and bend 90 degrees to the second end 21, so as to have elasticity. The bend 19 can extend axially from the first end 20, bend 90 degrees, and then extend radially to the second end 21. In another embodiment, the bend angle of the bend 19 can be other angles. In yet another embodiment, the bend 19 can also extend from the first end 20 and bend to the second end 21, so as to have elasticity.
[0060] like Figure 1 As shown, the elastic neck 18 may also include a reduced thickness portion 22. The reduced thickness portion 22 extends from the middle section 8 to the first end 20 of the bend 19. From the middle section 8 to the first end 20 of the bend 19, the thickness of the reduced thickness portion 22 gradually decreases. The first end 20 of the bend 19 is fixed to the middle section 8 through the reduced thickness portion 22. The gradually thinned reduced thickness portion 22 reduces the stress at the connection between the middle section 8 and the bend 19, thereby improving the bearing capacity. The reduced thickness portion 22 may extend axially from the middle section 8 to the first end 20 of the bend 19. The reduced thickness portion 22 may form a reduced thickness surface 23 on the inner circumference or the outer circumference. The reduced thickness surface 23 is inclined to reduce the thickness. The reduced thickness rate of the reduced thickness portion 22 along the axial direction may be the same, thereby forming a reduced thickness surface 23 with an oblique straight line profile on the cross-section.
[0061] like Figure 1 As shown, the thickness of the bend 19 is the thickness at the first end 20 where the thickness-reducing portion 22 connects to the bend 19 . Compared with the thickness of the middle section 8 , the thickness of the bend 19 is the thickness after being thinned by the thickness-reducing portion 22 , thereby improving the elasticity of the bend 19 .
[0062] like Figure 1 As shown, in the elastic neck 18, the bend 19 is bent or folded toward the thinning of the thickness-reduced portion 22 to form the elastic neck 18 with a hook-shaped cross section, thereby improving the elasticity of the elastic neck 18. For example, in the radial direction, the sun shaft connection portion 7 is located on the inner side of the middle section 8, and in the elastic neck 18 connected to the sun shaft connection portion 7, the thickness-reduced surface 23 is located on the inner circumference of the thickness-reduced portion 22, and from the first end 20 to the second end 21, the bend 19 is bent toward the radial inner side. For example, in the radial direction, the output shaft connection portion 9 is located on the outer side of the middle section 8, and in the elastic neck 18 connected to the output shaft connection portion 9, the thickness-reduced surface 23 is located on the outer circumference of the thickness-reduced portion 22, and from the first end 20 to the second end 21, the bend 19 is bent toward the radial outer side.
[0063] Although the present invention is disclosed as above by the embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention.
Claims
1. A gearbox central shaft for wind power generation equipment, characterized in that include: a sun shaft, configured to be connected to the sun gear and driven to rotate by the sun gear; an output shaft configured to connect to and drive the output gear to rotate; as well as The connecting shaft includes a sun shaft connecting part, a middle section and an output shaft connecting part, wherein the sun shaft connecting part is connected to the sun shaft at one axial end of the connecting shaft and is elastically connected to the middle section, and the output shaft connecting part is connected to the output shaft at the other axial end of the connecting shaft and is elastically connected to the middle section.
2. The gearbox central shaft according to claim 1, characterized in that: The connecting shaft further comprises an elastic neck, and the sun shaft connecting portion and the output shaft connecting portion are respectively connected to the middle section through the elastic neck; The elastic neck includes a bend extending from a first end and bending to a second end, the first end is fixed to the middle section, the second end is connected to the sun shaft connection part or the output shaft connection part, and the thickness of the bend is less than the thickness of the middle section.
3. The gearbox central shaft according to claim 2, characterized in that: The bent portion extends from the first end and bends 90 degrees to the second end.
4. The gearbox central shaft according to claim 2, characterized in that: The elastic neck also includes a thickness reduction portion, which extends from the middle section to the first end of the bend, and the thickness of the thickness reduction portion gradually decreases from the middle section to the first end of the bend.
5. The gearbox central shaft according to claim 4, characterized in that: The thickness of the bent portion is the thickness at the first end of the reduced thickness portion connected to the bent portion.
6. The gearbox central shaft according to claim 1, characterized in that: The sun shaft connection portion includes a flange, and the flange is bolted to the axial end surface of the sun shaft.
7. The gearbox central shaft according to claim 1, characterized in that: The sun shaft connection portion includes a side enclosure, which is located at the outer periphery of the sun shaft and fits the outer peripheral surface of the sun shaft.
8. The gearbox central shaft according to claim 1, characterized in that: The output shaft connection portion includes a flange, and the flange is bolted to the shaft end surface of the output shaft.
9. The gearbox central shaft according to claim 1, characterized in that: The output shaft connecting portion includes a bearing installation groove, which protrudes toward the outer periphery of the output shaft to fit an inner ring of a bearing supporting the output shaft.
10. The gearbox central shaft according to claim 9, characterized in that: The bearing installation groove includes an outer peripheral wall and an axial end wall connected to each other, wherein the outer peripheral wall is configured to support the inner peripheral surface of the bearing inner ring, and the axial end wall is configured to fit the axial end surface of the bearing inner ring.