Spline lubricating structure and wind power gear box

Abstract

The invention discloses a spline lubricating structure and a wind power gear box, and belongs to the technical field of gear boxes, the spline lubricating structure comprises a spline shaft, a sun gear, a hollow shaft and a cover plate, an oil storage cavity is formed between the inner peripheral wall of the spline shaft and the outer peripheral wall of the sun gear, and a spline meshing part between the sun gear and the spline shaft is located in the oil storage cavity; a hollow part extending in the axial direction is formed between the inner peripheral wall of the sun gear and the outer peripheral wall of the hollow shaft, and a radial oil hole communicating with the hollow part and the oil storage cavity is formed in the sun gear; a flow guide structure is arranged on the inner circumferential wall of the sun gear and used for receiving lubricating oil flowing into the hollow part and guiding the lubricating oil to flow into the oil storage cavity through the radial oil holes to lubricate the spline meshing part when the sun gear rotates, so that the lubricating path is simplified, and the lubricating stability and continuity are improved. The wind power gear box comprises a box body and a planetary transmission mechanism arranged in the box body, and the planetary transmission mechanism is provided with the spline lubricating structure.

Description

Technical Field

[0001] This invention relates to the field of gearbox technology, and more particularly to a spline lubrication structure and a wind turbine gearbox. Background Technology

[0002] In a wind power generation system, the main function of the gearbox is to convert the large torque of the wind turbine at low speeds into the high-speed torque required by the generator, thereby achieving efficient energy transfer and conversion and ensuring the stable and efficient operation of the wind turbine generator set.

[0003] In the transmission structure of a gearbox, the sun gear meshes with the spline. As a key component connecting and transmitting power, the spline is responsible for precisely transmitting torque between different components, ensuring the stable operation of the gearbox transmission system. The lubrication of the spline is crucial for its normal operation. Good lubrication effectively reduces frictional resistance during spline meshing, reduces wear, and improves transmission efficiency. Poor lubrication can easily lead to poor contact in the spline, causing transmission instability and accelerating spline wear. In severe cases, it can even cause spline failure, affecting the performance and service life of the entire gearbox.

[0004] Currently, the conventional method for spline lubrication involves spraying lubricating oil from the oil injection holes of the planetary carrier, which then enters the annular gap between the spline shaft and the sun gear. The lubricating oil then flows to the spline engagement position based on its own flow characteristics. However, since the planetary carrier, sun gear, and spline shaft are all rotating components, the spray direction is difficult to maintain consistently during equipment operation due to changes in rotational speed. This affects the accuracy and uniformity of the spray, resulting in a mediocre spray effect and failing to provide continuous, stable, and efficient lubrication for the spline. Summary of the Invention

[0005] The purpose of this invention is to provide a spline lubrication structure and a wind turbine gearbox to solve the technical problems of low stability and poor lubrication effect of the existing lubrication method of spraying lubricating oil onto the spline meshing.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On one hand, the present invention provides a spline lubrication structure for a planetary transmission mechanism, the planetary transmission mechanism including a spline shaft, a sun gear, a hollow shaft and a cover plate, the spline shaft being coaxially sleeved on the outer periphery of the sun gear and meshing with the sun gear through a spline, the hollow shaft passing through the sun gear, and the cover plate being connected to the hollow shaft.

[0008] Specifically, an oil reservoir is formed between the inner peripheral wall of the spline shaft and the outer peripheral wall of the sun gear, and the spline engagement portion between the sun gear and the spline shaft is located within the oil reservoir. An axially extending hollow portion is formed between the inner peripheral wall of the sun gear and the outer peripheral wall of the hollow shaft. A radial oil hole is provided on the sun gear to connect the hollow portion and the oil reservoir. A flow guiding structure is provided on the inner peripheral wall of the sun gear. The flow guiding structure is used to receive the lubricating oil flowing into the hollow portion and guide the lubricating oil through the radial oil hole to the oil reservoir to lubricate the spline engagement portion when the sun gear rotates.

[0009] Preferably, the flow guiding structure includes an annular groove disposed on the inner peripheral wall of the sun gear, the annular groove extending circumferentially along the sun gear and communicating with the radial oil hole, the annular groove being used to receive and temporarily store the lubricating oil flowing in from the hollow portion.

[0010] Preferably, the radial cross-sectional shape of the annular groove is one of arc, rectangle or trapezoid.

[0011] Preferably, the flow guiding structure further includes an oil-blocking boss disposed on the inner peripheral wall of the sun gear and located on one side of the annular groove. The oil-blocking boss is used to block the lubricating oil from the hollow part and guide the lubricating oil to the annular groove.

[0012] Preferably, there is a transition gap between the oil baffle boss and the hollow shaft.

[0013] Preferably, the cover plate has an oil passage, and the outer peripheral wall of the hollow shaft has a guide portion that connects the hollow part and the output end of the oil passage.

[0014] Preferably, there are multiple radial oil holes, which are distributed at intervals along the circumference of the sun gear.

[0015] Preferably, the outer peripheral wall of the sun gear is provided with a radial boss, and the radial boss and the inner peripheral wall of the spline shaft form a gap seal to seal the oil storage cavity.

[0016] Preferably, the inner peripheral wall of the spline shaft is provided with a first limiting protrusion and a second limiting protrusion located at both ends of the oil reservoir. The first limiting protrusion abuts against the axial end face of the radial boss, and the second limiting protrusion abuts against the axial end face of the sun gear.

[0017] On the other hand, the present invention also provides a wind turbine gearbox, the wind turbine gearbox comprising a housing and a planetary transmission mechanism disposed within the housing, the planetary transmission mechanism being configured with the aforementioned spline lubrication structure.

[0018] The beneficial effects of this invention are:

[0019] The spline lubrication structure proposed in this invention forms an oil reservoir cavity surrounding the spline engagement part between the spline shaft and the sun gear. This ensures that the spline engagement part requiring lubrication is always immersed in an oil environment, preventing lubricating oil from flowing to other parts or being thrown away from the spline engagement part during component rotation, thus avoiding weakened lubrication. Through a guide structure located inside the sun gear, the centrifugal force generated by the sun gear's rotation is utilized to guide the lubricating oil entering the hollow part from the hollow shaft direction to the radial oil holes. Under the action of centrifugal force, the oil then enters the oil reservoir cavity through the radial oil holes, achieving continuous, stable, and uniform lubrication of the spline engagement part. This process is entirely driven by the movement of the rotating components such as the sun gear and hollow shaft, unaffected by changes in external oil spray direction or spray accuracy, improving the reliability and efficiency of lubrication. Simultaneously, this structure integrates the lubricating oil drainage channel inside the sun gear, resulting in a compact structure that eliminates the need for a complex external planetary carrier oil spray system, simplifying the lubrication path and ensuring that the lubricating oil reaches the spline engagement part more directly and efficiently. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the spline lubrication structure provided in Embodiment 1 of the present invention;

[0021] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0022] In the picture:

[0023] 1. Splined shaft; 11. Splined engagement part; 12. First limiting protrusion; 13. Second limiting protrusion; 2. Sun gear; 21. Hollow part; 22. Radial oil hole; 23. Radial boss; 3. Hollow shaft; 31. Guide part; 4. Cover plate; 41. Oil passage; 5. Oil reservoir; 6. Flow guiding structure; 61. Annular groove; 62. Oil baffle boss; 621. Transition clearance. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] See Figure 1 and Figure 2 The spline lubrication structure provided in this embodiment of the invention is used in a planetary transmission mechanism. The planetary transmission mechanism includes a splined shaft 1, a sun gear 2, a hollow shaft 3, and a cover plate 4. The sun gear 2, as a transmission component, is hollow internally. The hollow shaft 3 passes axially through the central hole of the sun gear 2, providing support and power transmission for the sun gear 2. The splined shaft 1 is coaxially sleeved on the outside of the sun gear 2, and the inner splines of the splined shaft 1 mesh with the outer splines of the sun gear 2, thus forming a spline engagement part 11 for transmitting torque. The cover plate 4 is connected to the end of the hollow shaft 3, serving axial positioning or sealing purposes. Based on this planetary transmission mechanism, this invention provides a spline lubrication structure integrated within it.

[0030] Specifically, an oil reservoir 5 is formed between the inner peripheral wall of the spline shaft 1 and the outer peripheral wall of the sun gear 2, and the spline engagement portion 11 between the sun gear 2 and the spline shaft 1 is located in the oil reservoir 5; a hollow portion 21 extending axially is formed between the inner peripheral wall of the sun gear 2 and the outer peripheral wall of the hollow shaft 3, and a radial oil hole 22 is provided on the sun gear 2 to connect the hollow portion 21 and the oil reservoir 5; a flow guiding structure 6 is provided on the inner peripheral wall of the sun gear 2, which is used to receive the lubricating oil flowing into the hollow portion 21, and guide the lubricating oil through the radial oil hole 22 to flow into the oil reservoir 5 to lubricate the spline engagement portion 11 when the sun gear 2 rotates.

[0031] The spline lubrication structure proposed in this invention forms an oil reservoir 5 around the spline engagement portion 11 between the spline shaft 1 and the sun gear 2. This ensures that the spline engagement portion 11, which requires lubrication, is always immersed in an oil environment, preventing the lubricating oil from flowing to other parts or being thrown away from the spline engagement portion 11 during component rotation, thus avoiding weakening the lubrication effect. Through the guide structure 6 located inside the sun gear 2, the centrifugal force generated by the rotation of the sun gear 2 is utilized to guide the lubricating oil entering the hollow portion 21 from the direction of the hollow shaft 3 to the radial oil hole 22. Under the action of centrifugal force, the lubricating oil enters the oil reservoir 5 through the radial oil hole 22, thereby achieving continuous, stable, and uniform lubrication of the spline engagement portion 11. This process is entirely driven by the movement of the rotating components such as the sun gear 2 and the hollow shaft 3, and is not affected by external changes in the oil spray direction or spray accuracy, improving the reliability and efficiency of lubrication. Meanwhile, this structure integrates the lubricating oil channel inside the sun gear 2, making it compact and eliminating the need for a complex external oil spraying system on the planetary carrier. This simplifies the lubrication path and ensures that the lubricating oil can reach the spline engagement part 11 more directly and efficiently.

[0032] The working principle and specific structure of this spline lubrication structure will be explained in detail below.

[0033] Specifically, the sun gear 2 is provided with radial oil holes 22 for connecting the hollow portion 21 and the oil reservoir 5. In a preferred embodiment of the present invention, multiple radial oil holes 22 are provided, and the multiple radial oil holes 22 are evenly distributed along the circumference of the sun gear 2. When the sun gear 2 rotates at high speed, the multiple circumferentially spaced radial oil holes 22 can work together to ensure that the lubricating oil thrown out from the hollow portion 21 inside the sun gear 2 by centrifugal force can be evenly and synchronously injected into the oil reservoir 5 formed between the inner circumferential wall of the spline shaft 1 and the outer circumferential wall of the sun gear 2 along the circumference, effectively avoiding local lubrication problems that may be caused by single-point oil supply, and improving the uniformity and comprehensiveness of lubrication.

[0034] Furthermore, in order to supply lubricating oil to the oil reservoir 5, an oil passage 41 is provided on the cover plate 4. The input end of the oil passage 41 is usually connected to the centralized lubrication system of the gearbox, and the output end of the oil passage 41 faces the hollow part 21 between the hollow shaft 3 and the sun gear 2. In addition, a guide part 31 is formed on the outer peripheral wall of the hollow shaft 3, connecting the hollow part 21 and the output end of the oil passage 41, so as to guide the lubricating oil flowing out from the output end of the oil passage 41, so that it can flow effectively into the hollow part 21, so as to enter the oil reservoir 5 later.

[0035] The guide part 31 can be an axial groove, a spiral guide groove, or a guide surface of a specific shape opened on the surface of the hollow shaft 3. The specific implementation form is not limited here, as long as the above-mentioned effect can be achieved.

[0036] Specifically, since the cover plate 4 is fixedly connected to the gearbox housing or related stationary components, its position does not rotate with the internal transmission components. Therefore, the oil injection position and direction of the oil passage 41 opened on the cover plate 4 remain fixed during equipment operation. This fixed oil supply design effectively avoids the problems in the prior art where the oil injection direction constantly changes and the oil injection accuracy is difficult to control due to the rotation of the oil injection holes caused by rotating components such as the planetary carrier. This ensures that the lubricating oil can be delivered to the guide section 31 in a constant and reliable direction and position, providing a stable and controllable oil source input for the entire subsequent lubrication process.

[0037] In another preferred embodiment, the specific shape of the radial oil hole 22 can be optimized. The channel shape of the radial oil hole 22 can be straight or curved, such as a sloping line or arc inclined forward in the direction of rotation.

[0038] Furthermore, the width of the radial oil hole 22 can be set to gradually decrease from one end of the hollow part 21 to one end of the oil storage cavity 5. This gradually narrowing flow channel design can accelerate the flow of lubricating oil, which is conducive to the lubricating oil being sprayed into the oil storage cavity 5 more smoothly and in a more concentrated manner under the action of centrifugal force, while effectively suppressing the backflow of lubricating oil in the oil storage cavity 5.

[0039] The flow guiding structure 6 is used to receive and guide the lubricating oil. In this embodiment, the flow guiding structure 6 includes an annular groove 61 provided on the inner peripheral wall of the sun gear 2. The annular groove 61 extends circumferentially along the sun gear 2 and is connected to the inlet end of the radial oil hole 22. Its function is to receive the lubricating oil flowing in from the hollow part 21, and when the sun gear 2 rotates, the lubricating oil gathered in the annular groove 61 is thrown into the oil storage cavity 5 through the radial oil hole 22 by centrifugal force to lubricate the spline meshing part 11.

[0040] The annular groove 61 forms an oil collection and storage cavity on the sun gear 2, which can effectively collect the lubricating oil flowing axially along the hollow part 21, improve the storage efficiency and delivery stability of the lubricating oil, and ensure that even if the oil volume fluctuates, there is still enough lubricating oil to be delivered to the lubrication point.

[0041] Furthermore, the annular groove 61 can adopt different cross-sectional shapes according to specific design requirements. The radial cross-sectional shape of the annular groove 61 can be one of arc, rectangle, or trapezoid. For example, an arc-shaped cross-section is conducive to the flow and collection of lubricating oil in the annular groove 61, reducing flow resistance; a rectangular cross-section is easy to process and has a defined volume; while a trapezoidal cross-section is more conducive to collecting incoming oil. The selection of different cross-sectional shapes needs to be adjusted according to actual needs and adaptability to working conditions, which will not be elaborated here.

[0042] In addition, the flow guiding structure 6 also includes an oil-blocking boss 62 disposed on the inner peripheral wall of the sun gear 2 and located on one axial side of the annular groove 61. The oil-blocking boss 62 extends circumferentially along the inner peripheral wall of the sun gear 2 and is located on the axial side of the annular groove 61 away from the cover plate 4. When the lubricating oil from the hollow part 21 flows along the inner peripheral wall of the sun gear 2, it is blocked by the oil-blocking boss 62, thereby changing the flow direction. Under the combined action of centrifugal force and the oil-blocking boss 62, the lubricating oil is effectively guided and flows into the annular groove 61, thereby improving the collection efficiency of the lubricating oil flowing on the inner wall of the sun gear 2, ensuring that more lubricating oil can be delivered to the annular groove 61, and ensuring the amount of oil for subsequent lubrication of the spline engagement part 11 through the radial oil hole 22.

[0043] Furthermore, considering the dynamic relationship between components and the flowability of lubricating oil, there is a transition gap 621 between the oil-blocking boss 62 and the hollow shaft 3. The transition gap 621 refers to the annular space reserved between the end of the oil-blocking boss 62 away from the sun gear 2 and the outer peripheral surface of the hollow shaft 3.

[0044] The transition clearance 621 is designed to prevent rigid contact or friction between the oil baffle 62 and the hollow shaft 3 when there is relative movement or slight misalignment between the sun gear 2 and the hollow shaft 3, thus ensuring operational reliability. On the other hand, the transition clearance 621 also serves as a flow channel for lubricating oil, allowing some lubricating oil to pass through under pressure or gravity. This ensures that the lubricating oil can bypass or bypass the oil baffle 62 and continue to be delivered axially to other parts requiring lubrication, while also preventing excessive pressure buildup due to complete blockage.

[0045] In order to ensure that the lubricating oil in the oil reservoir 5 formed between the inner peripheral wall of the spline shaft 1 and the outer peripheral wall of the sun gear 2 can be effectively retained in the cavity and act on the spline meshing part 11, and to prevent excessive leakage along the axial direction, the axial sealing and limiting of the oil reservoir 5 are optimized in this embodiment.

[0046] Specifically, a radial boss 23 is provided on the outer peripheral wall of the sun gear 2. The radial boss 23 extends radially outward from the outer peripheral wall of the sun gear 2, and a small gap is maintained between the radial boss 23 and the inner peripheral wall of the spline shaft 1, thereby forming a gap seal. The gap seal surrounds the entire circumference of the sun gear 2, and its function is to dynamically seal at least one end of the oil reservoir 5. When the sun gear 2 and the spline shaft 1 rotate relative to each other, this small gap allows the necessary relative movement, while at the same time relying on the viscous resistance of the oil to prevent large-scale axial escape of the lubricating oil, thereby confining the lubricating oil mainly within the oil reservoir 5, ensuring that the spline meshing part 11 can be continuously immersed in the oil, improving the utilization efficiency of the lubricating oil and the continuity of lubrication.

[0047] To achieve axial assembly and positioning between the sun gear 2 and the splined shaft 1, and to further assist in sealing, the inner circumferential wall of the splined shaft 1 is provided with a first limiting protrusion 12 and a second limiting protrusion 13 located at both ends of the oil reservoir 5. In the assembled state, the first limiting protrusion 12 axially abuts against the axial end face of the radial boss 23 of the sun gear 2, while the second limiting protrusion 13 axially abuts against the axial end face of the sun gear 2 on the side away from the radial boss 23. Through the coordinated cooperation of the first limiting protrusion 12 and the second limiting protrusion 13, the sun gear 2 and the radial boss 23 are confined to a predetermined axial position within the splined shaft 1. This not only ensures the alignment of the spline meshing but also further blocks the leakage path of lubricating oil through the first limiting protrusion 12 and the second limiting protrusion 13. Thus, in conjunction with the gap seal, they together constitute an effective axial seal for the oil reservoir 5.

[0048] Example 2

[0049] This invention also provides a wind turbine gearbox, which includes a housing and a planetary transmission mechanism disposed within the housing. The planetary transmission mechanism is configured with a spline lubrication structure as provided in Embodiment 1.

[0050] During the operation of the wind turbine gearbox, lubricating oil is introduced through the oil passage 41 on the cover plate 4 and transported to the hollow part 21 inside the sun gear 2 via the guide part 31 on the hollow shaft 3. As the sun gear 2 rotates, the annular groove 61 and the oil-blocking boss 62 on its inner peripheral wall effectively collect the lubricating oil, and under the action of centrifugal force, the lubricating oil is continuously and evenly transported through the radial oil hole 22 to the oil storage cavity 5 formed by the sun gear 2 and the spline shaft 1, thereby stably and efficiently lubricating the spline meshing part 11.

[0051] Therefore, the wind turbine gearbox provided in this embodiment, by employing the aforementioned active, embedded spline lubrication structure in its planetary transmission mechanism, avoids the inherent defects of traditional external oil spray lubrication methods, such as unstable oil circuits and uneven lubrication caused by the dynamic movement of rotating components. This improves the lubrication reliability and durability of the splines under long-term high-load operation, effectively reducing wear and failure risks, thereby ensuring the smooth operation and service life of the overall transmission system of the wind turbine gearbox, and enhancing the operational reliability and maintenance economy of the wind turbine generator set.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A spline lubrication structure for a planetary transmission mechanism, the planetary transmission mechanism comprising a spline shaft (1), a sun gear (2), a hollow shaft (3) and a cover plate (4), the spline shaft (1) coaxially sleeving the outer periphery of the sun gear (2) and being connected with the sun gear (2) through spline engagement, the hollow shaft (3) penetrating the sun gear (2), and the cover plate (4) being connected with the hollow shaft (3), characterized in that: an oil storage cavity (5) is formed between the inner periphery wall of the spline shaft (1) and the outer periphery wall of the sun gear (2), and the spline engagement part (11) between the sun gear (2) and the spline shaft (1) is located in the oil storage cavity (5); a hollow part (21) extending in the axial direction is formed between the inner periphery wall of the sun gear (2) and the outer periphery wall of the hollow shaft (3), and a radial oil hole (22) is formed on the sun gear (2) to communicate the hollow part (21) and the oil storage cavity (5); a flow guide structure (6) is arranged on the inner periphery wall of the sun gear (2), the flow guide structure (6) is used for receiving lubricating oil flowing into the hollow part (21), and when the sun gear (2) rotates, the flow guide structure (6) guides the lubricating oil to flow into the oil storage cavity (5) through the radial oil hole (22) to lubricate the spline engagement part (11). The flow guide structure (6) comprises a ring groove (61) arranged on the inner periphery wall of the sun gear (2), the ring groove (61) extending along the circumference of the sun gear (2) and communicating with the radial oil hole (22), and the ring groove (61) is used for receiving and temporarily storing the lubricating oil flowing from the hollow part (21). The radial cross-sectional shape of the ring groove (61) is one of arc, rectangle or trapezoid. The flow guide structure (6) further comprises an oil blocking boss (62) arranged on the inner periphery wall of the sun gear (2) and located on one side of the ring groove (61) in the axial direction, the oil blocking boss (62) is used for blocking the lubricating oil from the hollow part (21) and guiding the lubricating oil to the ring groove (61).

2. The spline lubrication structure according to claim 1, characterized by The oil blocking boss (62) and the hollow shaft (3) have a transition gap (621).

3. The spline lubrication arrangement according to claim 2, characterized in that An oil passage (41) is formed on the cover plate (4), and a guide part (31) connecting the hollow part (21) and the output end of the oil passage (41) is formed on the outer periphery wall of the hollow shaft (3).

4. The spline lubrication structure according to claim 2, characterized by There are a plurality of radial oil holes (22), and the radial oil holes (22) are distributed at intervals along the circumference of the sun gear (2).

5. The spline lubrication arrangement according to claim 4, characterized in that A radial boss (23) is arranged on the outer periphery wall of the sun gear (2), and a gap seal is formed between the radial boss (23) and the inner periphery wall of the spline shaft (1) to seal the oil storage cavity (5).

6. The spline lubrication arrangement of claim 1, wherein The inner periphery wall of the spline shaft (1) is provided with a first limiting protrusion (12) and a second limiting protrusion (13) located at two ends of the oil storage cavity (5) respectively, the first limiting protrusion (12) abuts against the axial end face of the radial boss (23), and the second limiting protrusion (13) abuts against the axial end face of the sun gear (2).

7. The spline lubrication arrangement of claim 1 wherein, ​ 8. The spline lubrication arrangement of claim 1, wherein ​ 9. The spline lubrication arrangement according to claim 8, characterized in that ​ 10. A wind turbine gearbox, characterized in that The wind power gear box comprises a box body and a planetary transmission mechanism arranged in the box body, and the planetary transmission mechanism is configured with the spline lubricating structure as claimed in any one of claims 1 to 9.

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