An assembly structure of a sun gear shaft, a spline shaft and a planetary gear, and a wind power gear box

Abstract

The present invention discloses an assembly structure of a sun gear shaft, a spline shaft and a planetary gear, and a wind power gearbox, belonging to the field of mechanical transmission technology, and comprising: a sun gear shaft, one end of which is provided with helical gear external teeth, and the other end is provided with helical spline external teeth, the helical angle direction of the helical gear external teeth being the same as the helical angle direction of the helical spline external teeth; a spline shaft, the spline shaft sleeve is arranged on the end of the sun gear shaft provided with helical spline external teeth, the inner wall of the spline shaft is provided with helical spline internal teeth, the helical spline internal teeth cooperate with the helical spline external teeth; a planetary gear, the planetary gear meshes with the sun gear. The present invention matches the sun gear shaft with the spline shaft through a helical spline gear pair, and the helical spline gear pair can improve the tooth surface overlap, increase the load-bearing capacity, and is conducive to offsetting the axial force generated by the floating and loaded meshing of the sun gear shaft in the planetary gear system.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical transmission, and in particular to an assembly structure of a sun gear shaft, a spline shaft and a planetary gear, and a wind power gear box. Background Art

[0002] Figure 1 It is a schematic diagram of the assembly structure of the sun gear shaft, spline shaft and planetary gear in the existing megawatt-class wind power main gearbox, such as Figure 1 As shown, the transmission between the planetary stage and the parallel stage of the main gearbox of a megawatt-class wind turbine is usually carried out by the sun gear shaft 1' and the spline shaft 2' through a straight spline pair. During the transmission process, there is a certain amount of floating in the planetary gear system, resulting in the axial reciprocating displacement of the sun gear shaft 1' during the rotational motion. In addition, a certain axial force will be generated in the loaded meshing of the sun gear 3' and the planetary gear 4'. When the sun gear shaft 1' and the spline shaft 2' are meshed through the straight spline pair, the axial force is directly transmitted to the shoulder 21' of the spline shaft 2'. Under the action of the floating of the planetary gear system and the axial force of the meshing of the sun gear 3' and the planetary gear 4', the abutting end face 11' of the sun gear 3' and the shoulder 21' will wear out with the shoulder 21' of the spline shaft 2'. At the same time, under the action of the floating of the planetary shaft system, there is micro-friction between the meshing surfaces of the spline pair connecting the sun gear shaft 1' and the spline shaft 2', thereby generating a large amount of heat and tiny wear particles. The reciprocating displacement of the sun gear shaft 1', the axial force and the concentrated heat will accelerate the wear and failure of the spline shaft 2'.

[0003] Secondly, if Figure 1 As shown, in the conventional wind power main gearbox, an oil injection ring 5' is generally arranged on the sun gear shaft 1', and an oil injection hole is arranged on the oil injection ring 5' to obliquely spray the lubricating oil to the front end of the meshing area of ​​the sun gear shaft 1' and the spline shaft 2', so as to lubricate the straight spline pair meshing between the sun gear shaft 1' and the spline shaft 2'. However, the size of the oil injection hole on the oil injection ring 5' cannot be adjusted at any time. When the flow rate needs to be adjusted, the oil injection ring 5' needs to be re-expanded or re-processed and replaced with a new oil injection ring 5' according to the flow test results to adjust the flow rate, which will greatly affect the test cycle of the prototype, and the setting of the oil injection ring 5' will cause the internal structure of the gearbox to be not compact. In addition, the structure of the oil injection ring 5' is relatively complex, and the machining amount is large. Machining the oil injection hole on a thin-walled part such as the oil injection ring 5' will make it difficult to ensure the tolerance size of the parts, and the machining is difficult and the cost is high.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] The purpose of the present invention is to provide an assembly structure of a sun gear shaft, a spline shaft and a planetary gear, and a wind turbine gearbox, so as to solve the problem in the prior art wind turbine gearbox that the sun gear shaft generates axial force due to the floating of the sun gear shaft and the meshing of the sun gear and the planetary gear, thereby accelerating the wear of the spline shaft.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] An assembly structure of a sun gear shaft, a spline shaft and a planetary gear, comprising:

[0008] A sun gear shaft, one end of which is provided with helical gear external teeth, and the other end of which is provided with helical spline external teeth, wherein the helical angle direction of the helical gear external teeth is the same as the helical angle direction of the helical spline external teeth;

[0009] A spline shaft, wherein the spline shaft is a hollow shaft and is sleeved on one end of the sun gear shaft provided with an oblique spline external tooth, and the inner wall of the spline shaft is provided with an oblique spline internal tooth, and the oblique spline internal tooth cooperates with the oblique spline external tooth;

[0010] A planetary gear is meshedly connected with the sun gear.

[0011] Furthermore, it also includes a planetary carrier, the planetary wheels are arranged on the planetary carrier, and a lubricating oil circuit is arranged on the planetary carrier, and the lubricating oil circuit is used to provide lubricating oil to the meshing area between the oblique spline external teeth and the oblique spline internal teeth.

[0012] Furthermore, the planetary carrier includes two webs arranged opposite to each other, the planetary gear is arranged between the two webs, at least one of the two webs is provided with a through hole, the sun gear shaft passes through the through hole so that the outer teeth of the bevel gear are meshed and connected with the planetary gear, and the oil outlet of the lubricating oil circuit is arranged on the inner wall of the through hole.

[0013] Furthermore, the oil outlet is arranged at an angle, and a chamfered surface is arranged at the end of the spline shaft close to the planetary carrier, and the chamfered surface is used to guide the lubricating oil sprayed from the oil outlet to the meshing position of the oblique spline external teeth and the oblique spline internal teeth.

[0014] Furthermore, an inclined boss is provided on the inner wall of the through hole, and an oil outlet of the lubricating oil circuit is provided on the inclined boss and on a side of the inclined boss facing the spline shaft.

[0015] Furthermore, a plug is provided on the oil outlet of the lubricating oil circuit, and a through oil hole penetrating the lubricating oil circuit and the outside of the planet carrier is provided on the plug.

[0016] Furthermore, the inner wall of the spline shaft is provided with a shoulder, and the shoulder includes a first side wall close to the planetary gear and a second side wall away from the planetary gear, and the sun gear shaft is provided with an abutting end face abutting against the first side wall.

[0017] Furthermore, the shoulder is provided with an oil drain hole extending along the axial direction of the spline shaft.

[0018] Furthermore, a distance ring and an elastic retaining ring are provided on the sun gear shaft, the distance ring abuts against the second side wall, and the elastic retaining ring abuts against the distance ring to fix the distance ring on the sun gear shaft.

[0019] A wind power gearbox comprises a box body, a tube shaft and an assembly structure of the sun gear shaft, a spline shaft and a planetary gear as described above, wherein both ends of the tube shaft are connected to the box body, the sun gear shaft is a hollow shaft and is sleeved outside the tube shaft.

[0020] Beneficial effects of the present invention:

[0021] The sun gear shaft is connected to the spline shaft by an oblique spline pair, which is conducive to offsetting the axial force generated by the floating and loaded meshing of the planetary gear and the sun gear, thereby reducing the wear of the spline shaft; and the helical angle direction of the oblique spline on the sun gear shaft that meshes with the spline shaft is set to be the same as the helical angle direction of the helical teeth of the sun gear, which can further offset the axial force;

[0022] The sun gear shaft and the spline shaft are meshed through an oblique spline pair, which can improve the tooth surface overlap and increase the load-bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the sun gear shaft, spline shaft and planetary gear assembly structure in the prior art;

[0024] Figure 2 It is a structural schematic diagram of the assembly structure of the sun gear shaft, the spline shaft and the planetary gear of the present invention;

[0025] Figure 3 The present invention Figure 2 Enlarged view of part A.

[0026] In the figure:

[0027] 1', 1-sun gear shaft; 2', 2-spline shaft; 3'-sun gear; 3-helical gear external teeth; 4', 4-planetary gear; 5'-injection ring; 6-helical spline external teeth; 7-planet carrier; 8-plug; 9-distance ring; 10-elastic retaining ring; 20-tube shaft;

[0028] 11', 11-abutting end faces; 21', 21-shoulder blocks; 22-chamfered surfaces; 71-lubricating oil passage; 72-web plate; 711-oil outlet; 721-through hole; 722-avoidance portion; 7211-inclined boss. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0034] The present invention provides an assembly structure of a sun gear shaft, a spline shaft and a planetary gear. Figure 2 It is a structural schematic diagram of the assembly structure of the sun gear shaft, the spline shaft and the planetary gear of the present invention. Figure 3 yes Figure 2 The enlarged view of part A in Figure 3 As shown, the assembly structure includes a sun gear shaft 1 , a spline shaft 2 and a planetary gear 4 .

[0035] A sun gear is disposed at one end of the sun gear shaft 1. The sun gear may be integrally formed on the sun gear shaft 1 or may be a separate gear assembled on the sun gear shaft 1. This is not limited here. Figure 3 As shown, the sun gear is a helical gear external tooth 3 arranged at one end of the sun gear shaft 1, that is, the helical gear external tooth 3 is meshed with the planetary gear 4 through a helical gear pair. Naturally, the outer wall of the planetary gear 4 is provided with helical teeth that match the helical gear external tooth 3. The other end of the sun gear shaft 1 is provided with helical spline external teeth 6, which are used to connect with the helical spline internal teeth of the spline shaft 2, as shown in FIG. Figure 2 As shown, the spline shaft 2 is a hollow shaft, and the spline shaft 2 is sleeved on one end of the sun gear shaft 1 provided with an oblique spline external tooth 6, and the inner wall of the spline shaft 2 is provided with an oblique spline internal tooth, and the oblique spline internal tooth cooperates with the oblique spline external tooth 6, so that the spline shaft 2 and the sun gear shaft 1 are meshed and connected through the oblique spline gear pair. The spline shaft 2 and the sun gear shaft 1 are meshed and connected through the oblique spline gear pair, which can improve the tooth surface overlap and increase the load-bearing capacity compared to the straight spline gear pair connection, and the oblique spline gear pair is conducive to offsetting the axial force generated by the floating and loaded meshing of the planetary gear 4 and the sun gear 3, thereby reducing the wear of the spline shaft 2.

[0036] In addition, the helical angle direction of the helical gear external teeth 3 is the same as the helical angle direction of the helical spline external teeth 6 , which can better offset the axial force generated by the loaded meshing of the planetary gear 4 and the helical gear external teeth 3 .

[0037] Please continue reading Figure 2 The assembly structure of the present invention further includes a planet carrier 7, on which the planetary gear 4 is arranged, and a lubricating oil passage 71 is arranged on the planet carrier 7, and the lubricating oil passage 71 is used to provide lubricating oil to the meshing area between the oblique spline external teeth 6 and the oblique spline internal teeth. The prior art is to set an oil injection ring 5' to provide lubricating oil to the meshing area between the sun gear shaft 1 and the spline shaft 2, which requires the installation of an additional oil injection ring 5', which is not conducive to the simplification and compactness of the overall structure. The present invention directly sets the lubricating oil passage 71 on the planet carrier 7, which can avoid the need to set an additional oil injection ring 5', making the assembly structure more compact.

[0038] Further, such as Figure 2As shown, the planet carrier 7 includes two webs 72 arranged opposite to each other, and the planetary gear 4 is arranged between the two webs 72. Specifically, the two ends of the pin shaft are fixed on the two webs 72 respectively, and the planetary gear 4 is sleeved on the pin shaft, so that the planetary gear 4 is located between the two webs 72. At least one of the two webs 72 is provided with a through hole 721, and the sun gear shaft 1 can pass through the through hole 721. The sun gear shaft 1 passes through the through hole 721 so that the outer teeth 3 of the helical gear can mesh with the planetary gear 4. The oil outlet 711 of the lubricating oil passage 71 is arranged on the inner wall of the through hole 721. The oil outlet 711 is arranged on the inner wall of the through hole 721, so that the oil outlet 711 can be arranged in the space already existing in the planetary gear 4, without adding a structure for arranging the oil outlet 711 on the planetary gear 4, saving space and making the structure more compact.

[0039] In one embodiment, Figure 3 As shown, the oil outlet 711 can be set to be inclined, and a chamfered surface 22 is provided at the end of the spline shaft 2 close to the planetary carrier 7. The chamfered surface 22 is used to guide the lubricating oil sprayed from the oil outlet 711 to the meshing position of the oblique spline external teeth 6 and the oblique spline internal teeth, thereby providing lubricating oil for the meshing of the oblique spline external teeth 6 and the oblique spline internal teeth, thereby ensuring the normal operation of the equipment.

[0040] Furthermore, the inclination of the oil outlet 711 is smaller than the inclination of the chamfered surface 22, that is, the angle between the oil outlet 711 and the sun gear shaft 1 is smaller than the angle between the chamfered surface 22 and the sun gear shaft 1. This ensures that the chamfered surface 22 is steeper than the oil outlet 711, ensuring that the lubricating oil sprayed from the oil outlet 711 is smoothly guided from the chamfered surface 22 to the mating point between the oblique spline external teeth 6 and the oblique spline internal teeth. If the chamfered surface 22 is not steep enough, the lubricating oil sprayed from the oil outlet 711 may be sprayed onto the end face of the spline shaft 2, but cannot be completely sprayed onto the chamfered surface 22, thereby reducing the oil guiding effect of the chamfered surface 22.

[0041] Furthermore, Figure 3 As shown, when the oil outlet 711 is inclined, an inclined boss 7211 can also be provided on the inner wall of the through hole 721, and the oil outlet 711 of the lubricating oil path 71 is provided on the inclined boss 7211, and is provided on the side of the inclined boss 7211 facing the spline shaft 2. The inclined boss 7211 can make the oil outlet 711 closer to the end face of the spline shaft 2, and the lubrication effect is better. In addition, the inclined boss 7211 can form a avoidance portion 722 at the oil outlet 711 to avoid the lubricating oil sprayed from the oil outlet 711, so that the lubricating oil can be sprayed out smoothly.

[0042] In order to make the oil injection amount of the oil outlet 711 controllable and adjustable, the present invention provides a plug 8 on the oil outlet 711 of the lubricating oil circuit 71. The plug 8 is not a general plug that blocks the oil outlet 711, but a through oil hole is provided on the plug 8. The through oil hole penetrates the lubricating oil circuit 71 and the outside of the planetary carrier 7, or the through oil hole is a through hole provided on the plug 8 along the oil outlet direction of the oil outlet 711, so that after the plug 8 is blocked on the oil outlet 711, the lubricating oil can be sprayed out from the through oil hole on the plug 8. In practical applications, the through oil holes on several plugs 8 can be set to different sizes, so that the appropriate plug 8 can be selected according to the required oil output to achieve the adjustment of the oil output.

[0043] In the prior art, an oil injection ring 5' is provided to spray lubricating oil. To adjust the oil volume, the existing oil injection ring 5' needs to be expanded twice or a new oil injection ring 5' needs to be replaced. Not only is the replacement operation complicated, but also the oil injection hole is difficult to process on the thin-walled oil injection ring 5', the cost is high, and the tolerance size of the parts is not easy to guarantee. The present invention innovatively designs a plug 8 with a through oil hole to adjust the oil volume. When the oil volume needs to be adjusted, a different plug 8 can be replaced and screwed on the oil outlet 711. Moreover, processing the through oil hole on the plug 8 is convenient, easy to operate, and low in cost.

[0044] like Figure 3 As shown, the inner wall of the spline shaft 2 is provided with a shoulder 21, and the shoulder 21 includes a first side wall close to the planetary gear 4 and a second side wall away from the planetary gear 4. The sun gear shaft 1 is provided with an abutting end face 11 abutting against the first side wall, and the shoulder 21 is used to axially position and fix the sun gear shaft 1. In the existing structure, the wear of the shoulder 21' will be accelerated due to the floating of the planetary gear system and the axial force generated by the loaded meshing of the sun gear 3' and the planetary gear 4'. In the present invention, the sun gear shaft 1 is provided with a helical spline external tooth 6 meshing with the spline shaft 2, and the direct meshing of the helical gear external tooth 3 with the planetary gear 4 is also a helical tooth meshing, and the helical spline external tooth 6 and the helical gear external tooth 3 are in the same direction. Such a structure can well offset the axial force of the sun gear shaft 1, reduce the wear on the shoulder 21, and extend the service life of the equipment.

[0045] Furthermore, an oil drain hole extending along the axial direction of the spline shaft 2 is provided on the shoulder 21 . Since the lubricating oil for lubricating the meshing portion between the oblique spline 6 and the spline shaft 2 needs to flow out from the shoulder 21 , the oil drain hole is provided on the shoulder 21 .

[0046] like Figure 3 As shown, a distance ring 9 and a circlip 10 are provided on the sun gear shaft 1. The distance ring 9 abuts against the second side wall of the spline shaft 2, and the circlip 10 abuts against the distance ring 9, and the distance ring 9 is installed on the sun gear shaft 1. The distance ring 9 and the circlip 10 can realize the positioning and fixing of the sun gear shaft 1 and the spline shaft 2.

[0047] The present invention also provides a wind power gearbox, such as Figure 2 As shown, it includes a housing, a tube shaft 20, and the assembly structure of the sun gear shaft, the spline shaft and the planetary gear as described above, the two ends of the tube shaft 20 are connected to the housing, and the sun gear shaft 1 is a hollow shaft and is sleeved outside the tube shaft 20. The wind power gearbox of the present invention includes the assembly structure of the sun gear shaft, the spline shaft and the planetary gear, so it has at least the beneficial effects of the assembly structure of the sun gear shaft, the spline shaft and the planetary gear, which will not be repeated here.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An assembly structure of a sun gear shaft, a spline shaft and a planetary gear, characterized in that: include: A sun gear shaft (1), wherein one end of the sun gear shaft (1) is provided with helical gear external teeth (3), and the other end is provided with helical spline external teeth (6), and the helical angle direction of the helical gear external teeth (3) is in the same direction as the helical angle direction of the helical spline external teeth (6); A spline shaft (2), the spline shaft (2) being a hollow shaft and being sleeved on one end of the sun gear shaft (1) provided with an oblique spline external tooth (6), the inner wall of the spline shaft (2) being provided with an oblique spline internal tooth, the oblique spline internal tooth matching the oblique spline external tooth (6); A planetary gear (4), the planetary gear (4) being meshedly connected with the outer teeth of the helical gear (3); It also comprises a planet carrier (7), the planetary gear (4) is arranged on the planet carrier (7), and a lubricating oil path (71) is arranged on the planet carrier (7), and the lubricating oil path (71) is used to provide lubricating oil to the meshing area between the oblique spline external teeth (6) and the oblique spline internal teeth; The planet carrier (7) comprises two webs (72) arranged opposite to each other, the planet gear (4) is arranged between the two webs (72), at least one of the two webs (72) is provided with a through hole (721), the sun gear shaft (1) passes through the through hole (721) so that the outer teeth of the helical gear (3) are meshed and connected with the planet gear (4), and the oil outlet (711) of the lubricating oil passage (71) is arranged on the inner wall of the through hole (721); The oil outlet (711) is arranged at an angle, and a chamfered surface (22) is arranged at the end of the spline shaft (2) close to the planetary carrier (7), and the chamfered surface (22) is used to guide the lubricating oil sprayed from the oil outlet (711) to the meshing position of the oblique spline external teeth (6) and the oblique spline internal teeth.

2. The assembly structure according to claim 1, characterized in that: An inclined boss (7211) is provided on the inner wall of the through hole (721), and an oil outlet (711) of the lubricating oil passage (71) is provided on the inclined boss (7211) and on a side of the inclined boss (7211) facing the spline shaft (2).

3. The assembly structure according to claim 1, characterized in that: A plug (8) is provided on the oil outlet (711) of the lubricating oil circuit (71), and a through oil hole penetrating the lubricating oil circuit (71) and the outside of the planet carrier (7) is provided on the plug (8).

4. The assembly structure according to claim 1, characterized in that: The inner wall of the spline shaft (2) is provided with a stop shoulder (21), the stop shoulder (21) comprising a first side wall close to the planetary gear (4) and a second side wall away from the planetary gear (4), and the sun gear shaft (1) is provided with an abutment end face (11) abutting against the first side wall.

5. The assembly structure according to claim 4, characterized in that: The shoulder (21) is provided with an oil drain hole extending in the axial direction of the spline shaft (2).

6. The assembly structure according to claim 4, characterized in that: A distance ring (9) and an elastic retaining ring (10) are provided on the sun gear shaft (1); the distance ring (9) abuts against the second side wall, and the elastic retaining ring (10) abuts against the distance ring (9) so that the distance ring (9) is mounted on the sun gear shaft (1).

7. A wind power gearbox, characterized in that: It comprises a housing, a tubular shaft (20) and an assembly structure for assembling a sun gear shaft, a spline shaft and a planetary gear as described in any one of claims 1 to 6, wherein both ends of the tubular shaft (20) are connected to the housing, and the sun gear shaft (1) is a hollow shaft and is sleeved outside the tubular shaft (20).

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