Planetary gear assembly, gear box and wind turbine

Abstract

The application discloses a planetary gear assembly, a gear box and a wind driven generator, wherein the planetary gear assembly comprises a sun gear, a planet carrier and a stopper, the outer circumferential surface of the sun gear is provided with an external spline and a mounting groove, the external spline and the mounting groove are arranged along the axial direction of the sun gear, the planet carrier is sleeved on the outer circumferential surface of the sun gear, the inner circumferential surface of the planet carrier is provided with an internal spline, the internal spline is engaged with the external spline, the stopper is arranged at one end of the planet carrier, the stopper has a protruding part, the protruding part protrudes towards the axial direction of the sun gear and protrudes from the inner circumferential surface of the planet carrier, the protruding part is arranged in the mounting groove, and the outer surface of the protruding part and / or the groove wall surface of the mounting groove is provided as an arc surface. The technical scheme provided by the application can improve the floating performance of the sun gear, improve the load sharing coefficient, guarantee the uniform distribution of load during gear engagement, and enhance the transmission stability.

Description

Technical Field

[0001] This application relates to the field of planetary gear technology, and in particular to a planetary gear assembly, gearbox, and wind turbine. Background Technology

[0002] Planetary gear assemblies are the core transmission components of wind turbine gearboxes. They typically consist of a sun gear, planet carriers, etc., and power is transmitted through multi-stage NGW helical planetary transmission.

[0003] In existing technologies, to improve the load-sharing characteristics of the sun gear, the upper-stage sun gear and the lower-stage planetary carrier are connected by an involute spline to achieve a floating connection. However, because the sun gear is subjected to axial force, it needs to be axially limited by the planetary carrier. A common method is to directly press the end face of the sun gear against the stop plane of the lower-stage planetary carrier. However, this limiting method restricts the floating performance of the sun gear, resulting in a decrease in the load-sharing coefficient, which in turn affects the transmission stability. Utility Model Content

[0004] The purpose of this application is to provide a planetary gear assembly, gearbox, and wind turbine generator that can improve the floating performance of the sun gear, increase the load sharing coefficient, ensure uniform load distribution during gear meshing, and enhance transmission stability.

[0005] In a first aspect, this utility model provides a planetary gear assembly, comprising:

[0006] The sun gear has an external spline and a mounting groove on its outer peripheral surface, and the external spline and the mounting groove are arranged along the axial direction of the sun gear.

[0007] A planet carrier is fitted onto the outer circumferential surface of the sun gear, and the inner circumferential surface of the planet carrier is provided with an internal spline, which engages with the external spline.

[0008] A stop member is provided at one end of the planet carrier. The stop member has a protrusion that protrudes toward the axis of the sun gear and protrudes beyond the inner circumferential surface of the planet carrier. The protrusion is located in the mounting groove, and the outer surface of the protrusion and / or the groove wall surface of the mounting groove are arc surfaces.

[0009] Beneficial effects: This planetary gear assembly mounts the planetary carrier onto the sun gear. The internal splines of the planetary carrier mesh with the external splines of the sun gear to achieve efficient torque transmission. At the same time, a stop is installed at the end of the planetary carrier. The protrusion of the stop is embedded in the mounting groove of the sun gear. The axial limiting effect of the mounting groove on the stop indirectly restricts the axial movement of the sun gear along the planetary carrier, thereby achieving the functions of torque transmission and axial positioning simultaneously.

[0010] By making the outer surface of the protrusion of the stop and / or the wall surface of the mounting groove curved, a line-surface contact or line-line contact is formed between the protrusion and the mounting groove. Compared with the rigid constraint of traditional planar stops, the contact area between the protrusion and the mounting groove is reduced, which can provide the sun gear with a larger radial swing and axial movement space, avoid restricting the floating degree of freedom of the sun gear, thereby improving the load sharing coefficient, ensuring uniform load distribution during gear meshing, and enhancing transmission stability.

[0011] Furthermore, when installing the planetary gear assembly, it is only necessary to insert the protrusion of the stop into the mounting groove of the sun gear and connect the stop to the planet carrier. The structure is simple and easy to assemble.

[0012] In one optional embodiment, the outer surface of the protrusion is configured as the arc surface, and the arc surface protrudes toward the groove wall of the mounting groove.

[0013] Beneficial effects: When the outer surface of the protrusion is set as an arc surface, the groove wall surface of the mounting groove can be adapted to be designed as a flat surface or an inclined surface. Compared with the groove wall surface that needs to be machined as an arc surface, the machining process of a flat surface or an inclined surface is simpler, which can significantly reduce the machining difficulty and precision requirements of the sun gear mounting groove, thereby reducing manufacturing costs and improving production efficiency.

[0014] In one optional implementation, the arc surface is a spherical structure;

[0015] When the sun gear moves relative to the planet carrier, the spherical structure of the stop member forms a spherical contact with the wall of the mounting groove.

[0016] Beneficial effects: By designing the curved surface as a spherical structure, spherical contact is formed when the sun gear changes position relative to the planet carrier. This spherical contact creates a constraint relationship similar to a "spherical hinge," allowing the sun gear to achieve multi-directional radial oscillation, slight wobble, and axial movement in three-dimensional space. Its floating degrees of freedom better meet the requirements of load equalization. Compared to unidirectional curved surfaces such as cylindrical surfaces, the spherical surface can adapt to the complex posture changes of the sun gear caused by uneven load distribution, ensuring the uniformity of load at each gear meshing point.

[0017] In one alternative embodiment, an axial gap is provided between the outer surface of the protrusion and the wall surface of the mounting groove along the axial direction of the sun gear.

[0018] Beneficial effects: The axial clearance provides a certain axial movement margin for the sun gear, allowing it to generate a small axial displacement during operation based on factors such as load distribution and temperature changes. This avoids axial force concentration during gear meshing due to rigid constraints, thereby reducing tooth surface wear and contact stress and improving meshing stability.

[0019] In one alternative embodiment, an anti-wear layer is provided on the outer surface of the protrusion.

[0020] Beneficial effects: During the floating process of the sun gear, the outer surface of the protrusion and the wall of the mounting groove will frequently come into contact, rub, and even slide slightly. By setting an anti-wear layer on the outer surface of the protrusion, the hardness and wear resistance of the outer surface of the protrusion can be significantly improved, reducing material loss caused by friction, preventing premature failure of the protrusion, and thus extending the overall service life of the sun gear and the stop.

[0021] In one optional embodiment, the stop member is provided with an oil injection hole, and the planetary carrier is provided with an oil passage corresponding to the oil injection hole. The oil passage communicates with the oil injection hole, and the oil outlet direction of the oil injection hole is towards the inside of the mounting groove, for spraying lubricating oil into the mounting groove.

[0022] Beneficial effects: During the floating process of the sun gear, the protrusion and the mounting groove wall experience frequent relative motion. Through oil passages and injection holes, lubricating oil can be directly and continuously delivered to the contact interface between the two, forming a stable oil film. This effectively reduces the coefficient of friction, decreases mechanical and adhesive wear on the contact surfaces, and prevents surface scratches and seizing caused by dry friction or insufficient lubrication, significantly improving the wear resistance and service life of the components. Simultaneously, the lubricating oil can enter between the internal and external splines, lubricating both.

[0023] In one optional embodiment, the stop member is provided with a plurality of oil injection holes spaced apart, the oil injection holes being arranged to extend radially along the stop member.

[0024] Beneficial effects: Multiple spaced oil injection holes can spray lubricating oil into the mounting groove from different angles, covering the entire contact area between the outer surface of the protrusion and the wall of the mounting groove. Especially when the protrusion oscillates or wobbles radially with the sun gear, the oil injection holes at different positions can continuously supply oil to the dynamically changing contact points, avoiding localized friction aggravation due to lubrication blind spots caused by a single oil injection hole.

[0025] In one alternative embodiment, the stop is detachably disposed at one end of the planetary carrier by means of fasteners.

[0026] Beneficial effects: The stop component is detachably connected to one end of the planetary carrier through fasteners. During component assembly, the sun gear and planetary carrier can be precisely splined to ensure the accuracy of the spline engagement position. Then, the stop component is installed through fasteners to achieve axial positioning, which simplifies the assembly process and improves assembly efficiency.

[0027] In one optional embodiment, the stop member has multiple mounting holes, and the end of the planetary carrier has multiple connecting holes. The connecting holes correspond one-to-one with the mounting holes. The fastener passes through the mounting holes and connects to the corresponding connecting holes, so that the stop member is detachably located at one end of the planetary carrier.

[0028] Beneficial effects: The multiple mounting holes on the stop and the multiple connecting holes at the end of the planetary carrier correspond one-to-one. When the fastener passes through the mounting holes and connects with the connecting holes, the preload can be evenly distributed on the contact surface between the stop and the planetary carrier, avoiding deformation caused by excessive local stress, and significantly improving the stability of the overall connection structure. It is especially suitable for working conditions that transmit large torques.

[0029] In one optional embodiment, the sun gear is provided with a shoulder, and the mounting groove is disposed between the shoulder and the external spline;

[0030] The stop member includes multiple baffles, which are arranged circumferentially around the sun gear.

[0031] Beneficial effects: By placing the mounting slot between the shoulder and the external spline, the space in the axial direction of the sun gear can be fully utilized. The shoulder, as the axial positioning structure of the sun gear itself, already has a certain axial distance from the external spline. Integrating the mounting slot here eliminates the need to reserve additional limiting space at the end of the sun gear, and also eliminates the need to extend the axial length of the planetary carrier to arrange the stop structure. This can significantly shorten the overall axial dimension of the mating part between the sun gear and the planetary carrier, thereby reducing the total length of the gearbox and achieving equipment weight reduction.

[0032] Secondly, this utility model also provides a gearbox, including a planetary gear assembly.

[0033] Beneficial effects: This gearbox, because it includes a planetary gear assembly, has the same effects as a planetary gear assembly, which will not be elaborated further here.

[0034] Thirdly, this utility model also provides a wind turbine generator, comprising:

[0035] Cabin canopy;

[0036] A gearbox, which is located inside the engine room housing.

[0037] Beneficial effects: This wind turbine, because it includes a planetary gear assembly, has the same effects as a planetary gear assembly, which will not be elaborated further here. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a cross-sectional view of a planetary gear assembly in one embodiment provided in this application;

[0040] Figure 2 yes Figure 1 Enlarged view of the mounting slot in the middle;

[0041] Figure 3 yes Figure 2 Enlarged schematic diagram of the stop stop component;

[0042] Figure 4 This is a front view of the stop member of the planetary gear assembly in one embodiment provided in this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100. Sun gear; 110. External spline; 120. Mounting slot; 130. Shoulder;

[0045] 200. Planetary carrier; 210. Internal spline; 220. Oil passage;

[0046] 300. Stop; 310. Protrusion; 311. Curved surface; 320. Oil injection hole; 330. Baffle;

[0047] 400, Axial clearance;

[0048] 500. Fasteners. Detailed Implementation

[0049] In related technologies, to improve the load-sharing characteristics of the sun gear, the upper-stage sun gear and the lower-stage planetary carrier are connected by an involute spline to achieve a floating connection. However, because the sun gear is subjected to axial force, it needs to be axially limited by the planetary carrier. A common method is to directly press the end face of the sun gear against the stop plane of the lower-stage planetary carrier. However, this limiting method restricts the floating performance of the sun gear, resulting in a decrease in the load-sharing coefficient, which in turn affects the transmission stability.

[0050] In the early stages of the research and development of this application, addressing the core issue of traditional planar stop structures restricting the floating performance of the sun gear and resulting in a low load-sharing coefficient, the research team first explored a technical approach to improve the floating degree of freedom by optimizing the fit clearance. Specifically, they attempted to increase the axial fit tolerance between the external spline of the sun gear and the internal spline of the planet carrier, deliberately increasing the axial clearance at the fit point. When the axial clearance is increased, the rigid constraint of the spline meshing on the sun gear is significantly weakened, allowing it to more freely oscillate radially during torque transmission to compensate for minor coaxiality deviations during gear meshing. At the same time, it allows a certain degree of axial movement to balance the axial force distribution. Theoretically, this allows the sun gear to more flexibly adapt to load changes, thereby optimizing the load distribution among the planet gears and improving the overall load-sharing characteristics.

[0051] However, the solution of simply increasing axial clearance has revealed irreconcilable defects in experimental verification: First, excessive axial clearance directly weakens the axial limiting effect between the sun gear and the planetary carrier. Under the action of alternating axial force, the sun gear is prone to axial movement beyond the design range, which not only disrupts the normal meshing phase of the gear pair, resulting in a reduction in tooth surface contact area and an increase in impact stress, but may also cause abnormal interference between the sun gear and adjacent stage gears, housing end covers, and other components, and in severe cases, even cause rigid collisions between the tooth tip and tooth root. Second, increased clearance will exacerbate the dynamic instability of spline meshing. Under high-speed conditions, the axial movement and radial oscillation of the sun gear are coupled together, which can easily cause periodic impacts and vibrations on the spline tooth surface, not only generating obvious noise, but also accelerating tooth surface fatigue wear, leading to a rapid decline in spline fit accuracy.

[0052] Therefore, while simply increasing the axial clearance can improve the floating flexibility of the sun gear to some extent, it comes at the cost of sacrificing axial limiting reliability and transmission stability, and cannot achieve a balance between floating performance and limiting function.

[0053] Based on this, the inventors of this application redesigned the planetary gear assembly by mounting the planetary carrier on the sun gear. The internal splines of the planetary carrier mesh with the external splines of the sun gear to achieve efficient torque transmission. At the same time, a stop is installed at the end of the planetary carrier. The protrusion of the stop is embedded in the mounting groove of the sun gear. The axial limiting effect of the mounting groove on the stop indirectly restricts the axial movement of the sun gear along the planetary carrier, thereby simultaneously achieving the functions of torque transmission and axial positioning.

[0054] By making the outer surface of the protrusion of the stop and / or the wall surface of the mounting groove curved, a line-surface contact or line-line contact is formed between the protrusion and the mounting groove. Compared with the rigid constraint of traditional planar stops, the contact area between the protrusion and the mounting groove is reduced, which can provide the sun gear with a larger radial swing and axial movement space, avoid restricting the floating degree of freedom of the sun gear, thereby improving the load sharing coefficient, ensuring uniform load distribution during gear meshing, and enhancing transmission stability.

[0055] Furthermore, when installing the planetary gear assembly, it is only necessary to insert the protrusion of the stop into the mounting groove of the sun gear and connect the stop to the planet carrier. The structure is simple and easy to assemble.

[0056] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0057] The following is combined with Figures 1 to 4 The following describes embodiments of the present invention.

[0058] According to embodiments of the present invention, on the one hand, such as Figures 1 to 4 As shown, a planetary gear assembly is provided, including a sun gear 100, a planet carrier 200, and a stop 300.

[0059] Specifically, such as Figure 1 and Figure 2 As shown, the outer peripheral surface of the sun gear 100 is provided with an external spline 110 and a mounting groove 120. The external spline 110 and the mounting groove 120 are arranged along the axial direction of the sun gear 100.

[0060] Specifically, such as Figure 1 and Figure 2 As shown, the planet carrier 200 is fitted on the outer circumferential surface of the sun gear 100. The inner circumferential surface of the planet carrier 200 is provided with an inner spline 210, which meshes with the outer spline 110.

[0061] Specifically, such as Figures 1 to 3 As shown, a stop member 300 is disposed at one end of the planet carrier 200. The stop member 300 has a protrusion 310 that protrudes toward the axis of the sun gear 100 and protrudes beyond the inner circumferential surface of the planet carrier 200. The protrusion 310 is installed in the mounting groove 120, and the outer surface of the protrusion 310 and / or the groove wall surface of the mounting groove 120 are provided as an arc surface 311.

[0062] This planetary gear assembly mounts a planetary carrier 200 onto a sun gear 100. The internal spline 210 of the planetary carrier 200 meshes with the external spline 110 of the sun gear 100 to achieve efficient torque transmission. Simultaneously, a stop 300 is installed at the end of the planetary carrier 200. The protrusion 310 of the stop 300 is embedded in the mounting groove 120 of the sun gear 100. The axial limiting effect of the mounting groove 120 on the stop 300 indirectly restricts the axial movement of the sun gear 100 along the planetary carrier 200, thereby simultaneously achieving torque transmission and axial positioning functions.

[0063] By making the outer surface of the protrusion 310 of the stop 300 and / or the groove wall of the mounting groove 120 into an arc surface 311, a line-surface contact or line-line contact is formed between the protrusion 310 and the mounting groove 120. Compared with the rigid constraint of traditional planar stops, the contact area between the protrusion 310 and the mounting groove 120 is reduced, which can provide the sun gear 100 with a larger radial swing and axial movement space, avoid restricting the floating degree of freedom of the sun gear 100, thereby improving the load sharing coefficient, ensuring uniform load distribution during gear meshing, and enhancing transmission stability.

[0064] Furthermore, when installing the planetary gear assembly, it is only necessary to insert the protrusion 310 of the stop 300 into the mounting groove 120 of the sun gear 100 and connect the stop 300 to the planet carrier 200. The structure is simple and easy to assemble.

[0065] Specifically, the external spline 110 and the mounting groove 120 can be spaced apart or sequentially fitted together. In this embodiment, there are no specific restrictions on the arrangement of the external spline 110 and the mounting groove 120.

[0066] Specifically, the mounting groove 120 can be configured as an annular groove, a rectangular groove, a stepped groove, a T-shaped groove, etc. In this embodiment, the type of mounting groove 120 is not specifically limited.

[0067] Specifically, multiple internal splines 210 and external splines 110 can be provided. In this embodiment, the number of internal splines 210 and external splines 110 is not limited. Furthermore, internal splines 210 and external splines 110 can be rectangular splines, involute splines, etc. In this embodiment, the structure of internal splines 210 and external splines 110 is not specifically limited.

[0068] Specifically, the connection between the stop 300 and the planetary carrier 200 can be achieved by bolt connection, snap-fit ​​connection or other connection methods. In this embodiment, no specific restrictions are placed on the connection method between the stop 300 and the planetary carrier 200.

[0069] Specifically, the outer surface of the protrusion 310 can be set to an arc shape, or the groove wall of the mounting groove 120 can be set to an arc shape, or both the outer surface of the protrusion 310 and the groove wall of the mounting groove 120 can be set to an arc shape.

[0070] In one embodiment, such as Figure 2 and Figure 3 As shown, the outer surface of the protrusion 310 is set as an arc surface 311, and the arc surface 311 protrudes toward the groove wall of the mounting groove 120.

[0071] When the outer surface of the protrusion 310 is set as an arc surface 311, the groove wall surface of the mounting groove 120 can be adapted to be designed as a plane or an inclined surface. Compared with the groove wall surface that needs to be machined as an arc surface 311, the machining process of a plane or an inclined surface is simpler, which can significantly reduce the machining difficulty and precision requirements of the mounting groove 120 of the sun gear 100, thereby reducing manufacturing costs and improving production efficiency.

[0072] The raised design of the arc surface 311 allows the raised part 310 to form a line-to-surface contact with the wall of the mounting groove 120, which can provide the sun gear 100 with a larger radial swing and a small deflection deformation space, avoid restricting its floating action caused by load sharing requirements, thereby improving the uniformity of load distribution during gear meshing and optimizing the load sharing coefficient.

[0073] In addition, the arc surface 311 of the protrusion 310 protruding towards the groove wall can guide the contact point to adjust adaptively as the sun gear 100 floats, which can effectively reduce friction and wear, extend the service life of the component, and reduce the risk of oil contamination caused by wear.

[0074] Specifically, the arc surface 311 can be a spherical arc surface 311, a cylindrical arc surface 311, a conical arc surface 311, etc. In this embodiment, the shape of the arc surface 311 is not specifically limited.

[0075] In one embodiment, such as Figure 2 and Figure 3 As shown, the arc surface 311 is configured as a spherical structure. When the sun gear 100 moves relative to the planet carrier 200, that is, when the sun gear 100 oscillates radially or moves axially, the spherical structure of the stop member 300 forms a spherical contact with the groove wall of the mounting groove 120.

[0076] By designing the arc surface 311 as a spherical structure, spherical contact is formed when the sun gear 100 changes position relative to the planet carrier 200. The spherical contact can form a constraint relationship similar to a "spherical hinge," allowing the sun gear 100 to achieve multi-directional radial oscillation, slight wobble, and axial movement in three-dimensional space. Its floating degree of freedom is more in line with the load equalization requirements. Compared with unidirectional arc surfaces such as cylindrical surfaces 311, the spherical surface can adapt to the complex posture changes of the sun gear 100 caused by uneven load distribution, ensuring the uniformity of load at each gear meshing point.

[0077] Furthermore, regardless of the direction in which the sun gear 100 is offset, the spherical structure and the wall of the mounting groove 120 always maintain stable point contact (or small area contact). The position of the contact point is automatically adjusted with the offset, which can avoid local stress concentration. The wear rate can be reduced through adaptive contact characteristics, and the service life of the stop 300 and the sun gear 100 can be extended.

[0078] Specifically, spherical contact can compensate for coaxiality deviations during assembly, as well as minor deformations caused by temperature changes and loads during operation, ensuring that the axial limiting function is always reliable and avoiding the jamming problem caused by misalignment in traditional planar contact.

[0079] In one embodiment, such as Figure 2 As shown, along the axial direction of the sun gear 100, there is an axial gap 400 between the outer surface of the protrusion 310 and the groove wall of the mounting groove 120.

[0080] The axial clearance of 400 provides a certain axial movement margin for the sun gear 100, enabling the sun gear 100 to generate a small axial displacement during operation according to factors such as load distribution and temperature changes. This avoids the concentration of axial force during gear meshing due to rigid constraints, thereby reducing tooth surface wear and contact stress and improving meshing stability.

[0081] Specifically, the reasonable range of the axial clearance 400 needs to be determined comprehensively based on the specific application scenario, material properties and operating parameters of the planetary gear assembly. In this embodiment, the range of the axial clearance 400 is not specifically limited.

[0082] In one embodiment, such as Figure 2 and Figure 3 As shown, an anti-wear layer (not shown in the figure) is provided on the outer surface of the protrusion 310.

[0083] During the floating process of the sun gear 100, the outer surface of the protrusion 310 and the groove wall of the mounting groove 120 will frequently come into contact, rub, or even slide slightly. By setting an anti-wear layer on the outer surface of the protrusion 310, the hardness and wear resistance of the outer surface of the protrusion 310 can be significantly improved, reducing material loss caused by friction, preventing the protrusion 310 from failing prematurely, and thus extending the overall service life of the sun gear 100 and the stop 300.

[0084] The wear-resistant layer has low frictional properties, which can reduce the coefficient of friction between the protrusion 310 and the groove wall of the mounting groove 120. This not only reduces the frictional resistance during relative movement and energy loss during power transmission, but also reduces frictional heat generation, preventing material performance degradation or lubricant failure caused by excessively high local temperatures.

[0085] Specifically, the wear-resistant layer can be a hard alloy plating layer, a ceramic coating, a wear-resistant alloy weld overlay layer, etc. In the embodiments of this application, the type of wear-resistant layer is not specifically limited.

[0086] In one embodiment, such as Figure 2 and Figure 3 As shown, the stop member 300 has an oil injection hole 320, and the planetary carrier 200 has an oil passage 220. The oil passage 220 is correspondingly arranged with the oil injection hole 320 and is connected to the oil injection hole 320. The oil outlet direction of the oil injection hole 320 is towards the inside of the mounting groove 120, and it is used to spray lubricating oil into the mounting groove 120.

[0087] During the floating process of the sun gear 100, the protrusion 310 and the groove wall of the mounting groove 120 experience frequent relative motion. Through the oil passage 220 and the oil injection hole 320, lubricating oil can be directly and continuously delivered to the contact interface between the two, forming a stable oil film. This effectively reduces the coefficient of friction, decreases mechanical and adhesive wear on the contact surfaces, and prevents surface scratches and seizing caused by dry friction or insufficient lubrication, significantly improving the wear resistance and service life of the components. Simultaneously, the lubricating oil can enter between the internal spline 210 and the external spline 110, lubricating both.

[0088] In addition, the friction between the protrusion 310 and the groove wall generates heat. After the flowing lubricating oil enters the mounting groove 120 through the oil spray hole 320, it can carry away some of the heat in the contact area, which helps to control the temperature of the contact surface, avoid lubricating oil failure or material performance degradation due to local overheating, and ensure the stability of the component under high temperature conditions.

[0089] Specifically, the oil injection hole 320 can be set at an angle or along the radial direction of the stop member 300. In this embodiment, the setting method of the oil injection hole 320 is not specifically limited.

[0090] Specifically, such as Figure 2 As shown, the oil passage 220 can be extended along the axial direction of the planetary carrier 200.

[0091] In one embodiment, such as Figure 2 As shown, the stop member 300 has a plurality of oil injection holes 320, wherein the plurality of oil injection holes 320 are spaced apart and the oil injection holes 320 extend radially along the stop member 300.

[0092] Multiple spaced-apart oil injection holes 320 can spray lubricating oil into the mounting groove 120 from different angles, covering the entire contact area between the outer surface of the protrusion 310 and the groove wall of the mounting groove 120. Especially when the protrusion 310 oscillates or wobbles radially with the sun gear 100, the oil injection holes 320 at different positions can continuously supply oil to the dynamically changing contact points, avoiding localized friction aggravation due to lubrication blind spots caused by a single oil injection hole 320.

[0093] The radially extending design of the oil injection hole 320 allows the lubricating oil to act directly on the radial contact surface between the protrusion 310 and the groove wall, ensuring precise lubrication coverage of the core friction parts.

[0094] Specifically, the multiple injection holes 320 can be evenly spaced or non-uniformly spaced. In this embodiment, the distribution of the injection holes 320 is not specifically limited.

[0095] In one embodiment, such as Figure 2 As shown, the stop 300 is detachably mounted on one end of the planet carrier 200 by fasteners 500.

[0096] The stop 300 is detachably connected to one end of the planetary carrier 200 via the fastener 500. During component assembly, the sun gear 100 and the planetary carrier 200 can be precisely splined to ensure the accuracy of the spline engagement position. Then, the stop 300 is installed via the fastener 500 to achieve axial positioning, which simplifies the assembly process and improves assembly efficiency.

[0097] When the stop part 300 suffers wear, deformation or other damage after long-term use, it can be replaced individually without disassembling the sun gear 100 or the entire assembly. This significantly reduces maintenance difficulty and cost, while also reducing downtime caused by maintenance.

[0098] In addition, the fastener 500 can ensure a tight fit between the stop 300 and the planetary carrier 200 through pre-tightening force, preventing loosening due to vibration during transmission and ensuring the stability of axial positioning.

[0099] Specifically, the fastener 500 can be selected from bolts, screws, nuts, etc. In this embodiment, the type of fastener 500 is not specifically limited.

[0100] In one embodiment, the stop member 300 is provided with a plurality of mounting holes (not shown in the figure), and the end of the planet carrier 200 is provided with a plurality of connecting holes (not shown in the figure). The connecting holes are provided in a one-to-one correspondence with the mounting holes. The fastener 500 is passed through the mounting hole and connected to the corresponding connecting hole, so that the stop member 300 is detachably provided at one end of the planet carrier 200.

[0101] The multiple mounting holes on the stop 300 correspond one-to-one with the multiple connecting holes at the end of the planetary carrier 200. When the fastener 500 passes through the mounting holes and connects with the connecting holes, it can evenly distribute the preload on the contact surface between the stop 300 and the planetary carrier 200, avoiding deformation caused by excessive local stress, and significantly improving the stability of the overall connection structure. It is especially suitable for working conditions that transmit large torques.

[0102] The one-to-one corresponding mounting holes and connecting holes provide a clear positioning reference for the assembly of the stop 300 and the planetary carrier 200, which can effectively avoid circumferential deviation or axial misalignment during the installation of the stop 300, and ensure that the protrusion 310 of the stop 300 can be accurately embedded in the mounting groove 120, thus ensuring the reliable realization of the axial limiting function.

[0103] Specifically, the multiple mounting holes can be evenly distributed at intervals along the circumference of the stop 300, or arranged symmetrically. In this embodiment, no specific restrictions are placed on the arrangement of the multiple mounting holes.

[0104] For example, multiple mounting holes can be evenly spaced along the circumference of the stop 300, with equal included angles between adjacent holes. This arrangement allows the preload of the fastener 500 to be evenly applied to the contact surface between the stop 300 and the planetary carrier 200, avoiding deformation of the stop 300 caused by local stress concentration and ensuring the stability of the connection structure.

[0105] In one embodiment, such as Figure 2 and Figure 4 As shown, the sun gear 100 is provided with a shoulder 130, and the mounting groove 120 is provided between the shoulder 130 and the external spline 110. The stop member 300 includes a plurality of baffles 330, which are arranged circumferentially around the sun gear 100.

[0106] By placing the mounting slot 120 between the shoulder 130 and the external spline 110, the space in the axial direction of the sun gear 100 can be fully utilized. The shoulder 130, as the axial positioning structure of the sun gear 100 itself, already has a certain axial distance from the external spline 110. By integrating the mounting slot 120 here, there is no need to reserve a special limiting space at the end of the sun gear 100, nor is it necessary to extend the axial length of the planetary carrier 200 to arrange the stop structure. This can significantly shorten the overall axial dimension of the mating part between the sun gear 100 and the planetary carrier 200, thereby reducing the total length of the gearbox and achieving equipment weight reduction.

[0107] The stop component 300 consists of multiple pressure plates arranged circumferentially around the sun gear 100. Compared to an integral ring structure, this reduces material usage. Especially in large-size planetary gear assemblies, it significantly reduces the overall mass of the stop component 300, thereby reducing rotational inertia, improving the dynamic response speed of the assembly, and reducing drive energy consumption. Furthermore, the multiple independent pressure plates can be installed or removed individually. In scenarios where space around the sun gear 100 is limited (such as when other components interfere), it can be installed piece by piece, avoiding obstacles, without the need for overall alignment. This greatly reduces space constraints during assembly, making it particularly suitable for compact transmission systems.

[0108] When individual pressure plates wear or deform due to long-term use, only the damaged pressure plate can be removed and replaced, without replacing the entire stop part 300. This reduces spare parts consumption and maintenance workload, and lowers maintenance costs and downtime.

[0109] Specifically, the stop member 300 may be provided with two pressure plates, three pressure plates, four pressure plates, etc. In this embodiment of the application, the number of pressure plates is not specifically limited.

[0110] For example, such as Figure 4 As shown, the stop member 300 is provided with two pressure plates, each pressure plate being semi-circular, and the two pressure plates are arranged around the circumference of the sun gear 100.

[0111] According to an embodiment of the present invention, another aspect provides a gearbox including a planetary gear assembly.

[0112] This gearbox, since it includes a planetary gear assembly, has the same effect as a planetary gear assembly, and will not be described further here.

[0113] Specifically, the gearbox can be used in wind turbine gearboxes, construction machinery gearboxes (such as excavators and cranes), machine tool spindle gearboxes, etc. In this embodiment, no specific restrictions are placed on the application scenarios of the gearbox.

[0114] According to an embodiment of the present invention, another aspect provides a wind turbine generator, including a nacelle cover (not shown) and a gearbox.

[0115] This wind turbine, since it includes a planetary gear assembly, has the same effect as a planetary gear assembly, and will not be described further here.

[0116] The terms "upper" and "lower" are used to describe the relative positions of the various structures in the accompanying drawings. They are only for clarity of description and are not intended to limit the scope of implementation of this application. Any changes or adjustments to the relative positions without substantially altering the technical content shall also be considered within the scope of implementation of this application.

[0117] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is 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 can mean that the first feature is 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.

[0118] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to 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 application according to the specific circumstances.

[0119] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A planetary gear assembly characterized by, include: The sun gear (100) has an external spline (110) and a mounting groove (120) on its outer peripheral surface, and the external spline (110) and the mounting groove (120) are arranged along the axial direction of the sun gear (100); A planet carrier (200) is fitted onto the outer circumferential surface of the sun gear (100). The inner circumferential surface of the planet carrier (200) is provided with an inner spline (210), and the inner spline (210) meshes with the outer spline (110). A stop (300) is provided at one end of the planet carrier (200). The stop (300) has a protrusion (310) that protrudes toward the axis of the sun gear (100) and protrudes from the inner circumferential surface of the planet carrier (200). The protrusion (310) is provided in the mounting groove (120), and the outer surface of the protrusion (310) and / or the groove wall surface of the mounting groove (120) are provided as an arc surface (311).

2. The planetary gear assembly of claim 1, wherein, The outer surface of the protrusion (310) is configured as the arc surface (311), and the arc surface (311) protrudes toward the groove wall of the mounting groove (120).

3. The planetary gear assembly of claim 2, wherein, The arc surface (311) is a spherical structure; When the sun gear (100) moves relative to the planet carrier (200), the spherical structure of the stop (300) forms a spherical contact with the groove wall of the mounting groove (120).

4. The planetary gear assembly of claim 3, wherein, Along the axial direction of the sun gear (100), there is an axial gap (400) between the outer surface of the protrusion (310) and the groove wall of the mounting groove (120).

5. The planetary gear assembly of claim 2, wherein, The outer surface of the protrusion (310) is provided with a wear-resistant layer.

6. The planetary gear assembly according to any one of claims 1 to 5, characterized in that, The stop member (300) is provided with an oil injection hole (320), and the planetary carrier (200) is provided with an oil passage (220) corresponding to the oil injection hole (320). The oil passage (220) is connected to the oil injection hole (320), and the oil outlet direction of the oil injection hole (320) is towards the inside of the mounting groove (120) for spraying lubricating oil into the mounting groove (120).

7. The planetary gear assembly of claim 6, wherein, The stop member (300) is provided with a plurality of oil injection holes (320) spaced apart, and the oil injection holes (320) are arranged to extend radially along the stop member (300).

8. The planetary gear assembly of any one of claims 1 to 5, wherein, The stop (300) is detachably provided at one end of the planetary carrier (200) by means of a fastener (500).

9. The planetary gear assembly of claim 8, wherein, The stop (300) has multiple mounting holes, and the end of the planetary carrier (200) has multiple connecting holes. The connecting holes correspond one-to-one with the mounting holes. The fastener (500) passes through the mounting holes and connects to the corresponding connecting holes, so that the stop (300) is detachably located at one end of the planetary carrier (200).

10. The planetary gear assembly of claim 9, wherein, The sun gear (100) is provided with a shoulder (130), and the mounting groove (120) is provided between the shoulder (130) and the external spline (110); The stop (300) includes a plurality of baffles (330) arranged circumferentially around the sun gear (100).

11. A gearbox, characterized in that, include: The planetary gear assembly according to any one of claims 1 to 10.

12. A wind turbine generator, characterized in that, include: Cabin canopy; The gearbox of claim 11, wherein the gearbox is disposed within the engine compartment cover.

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