Lightweight yaw reducer

Abstract

The application discloses a light yaw speed reducer and belongs to the technical field of wind power equipment. The application solves the problems of large size and heavy weight of the existing yaw speed reducer. The yaw speed reducer comprises a speed reduction shell, a multi-stage speed reduction mechanism and an output gear shaft, the multi-stage speed reduction mechanism is rotationally connected with the speed reduction shell, a first-stage speed reducer, a second-stage speed reducer, a third-stage speed reducer, a fourth-stage speed reducer and a fifth-stage speed reducer are arranged in sequence along the same axis, the output part of the front-stage speed reducer is in mesh transmission with the input part of the rear-stage speed reducer, and the output part of the fifth-stage speed reducer is in mesh transmission with the output gear shaft. The first-stage to fifth-stage speed reducers are arranged in sequence along the same axis and integrated in the speed reduction shell, so that the high integration of the multi-stage transmission mechanism is realized. The overall structure is extremely compact, the size is greatly reduced, the material of the support structure is directly reduced, and the structure is lightened.

Description

Technical Field

[0001] This invention relates to the field of wind power equipment technology, and more particularly to a lightweight yaw reducer. Background Technology

[0002] The yaw gearbox is the core transmission component of the yaw drive system of a wind turbine. It typically consists of multiple yaw gearboxes meshing simultaneously with the large gear ring of the slewing bearing, jointly driving the rotation of the wind turbine nacelle to achieve precise adjustment of the wind direction. With the rapid development of wind power technology towards higher power, larger scale, and offshore wind power, space at the top of wind turbine towers is becoming increasingly limited, while also placing more stringent requirements on the control of tower top loads. Traditional yaw gearboxes generally suffer from large size and significant weight, which not only increases the layout difficulty within limited space but also significantly increases the static and dynamic loads at the tower top, thus affecting the overall economic efficiency and structural safety of the unit. Therefore, how to significantly achieve compactness and lightweighting of the gearbox through structural design, such as planetary gear transmission optimization, lightweight housing design, and innovative output-end integration, while ensuring sufficient load-bearing capacity, operational reliability, and long-term stability, has become a key technological trend for addressing current wind power equipment challenges and reducing overall manufacturing costs and transportation and installation difficulties. Summary of the Invention

[0003] The present invention aims to solve the above-mentioned problems and thereby provide a lightweight yaw reducer.

[0004] The technical solution adopted by this invention to solve the above-mentioned technical problems is: a lightweight yaw reducer, comprising a reduction housing, a multi-stage reduction mechanism, and an output gear shaft. The multi-stage reduction mechanism is rotatably connected to the reduction housing. The multi-stage reduction mechanism is a multi-stage planetary gear train in series structure, comprising a first-stage reducer, a second-stage reducer, a third-stage reducer, a fourth-stage reducer, and a fifth-stage reducer. The first-stage reducer, second-stage reducer, third-stage reducer, fourth-stage reducer, and fifth-stage reducer are arranged sequentially along the same axis, and the output part of the previous stage reducer meshes with the input part of the adjacent next stage reducer. The output part of the fifth-stage reducer meshes with the output gear shaft. The reduction housing comprises an upper body, first, second, and third stage gear rings, and fourth and fifth stage gear rings. The second and third stage gear rings and the fourth and fifth stage gear rings are coaxially arranged and fixedly connected by bolts. The first stage reducer includes a first stage sun gear, multiple first stage planet gears, and a first stage planet carrier. The first stage sun gear is rotatably connected to the upper body through bearings. The first, second, and third stage gear rings are coaxially arranged with the first stage sun gear. Multiple first stage planet gears mesh between the first stage sun gear and the first, second, and third stage gear rings. Each first stage planet gear has a first stage wheel shaft inserted inside. Multiple cylindrical rolling elements are provided between the first stage planet gears and the first stage wheel shafts. The bottom of the first stage wheel shaft is fixedly connected to the first stage planet carrier. Washers are provided between the first stage planet gears and the first stage planet carrier. The first stage planet carrier engages with the spline at the input end of the second stage sun gear of the second stage reducer through its spline for transmission.

[0005] Furthermore, the transmission methods between adjacent reducers, as well as between the fifth-stage reducer and the output gear shaft, are the same as those between the first-stage reducer and the second-stage reducer.

[0006] Furthermore, in the two-stage reducer, multiple second-stage planetary gears are meshed between the first, second, and third-stage ring gears and the second-stage sun gear; in the three-stage reducer, multiple third-stage planetary gears are meshed between the first, second, and third-stage ring gears and the third-stage sun gear; in the four-stage reducer, multiple fourth-stage planetary gears are meshed between the fourth and fifth-stage ring gears and the fourth-stage sun gear; and in the five-stage reducer, multiple fifth-stage planetary gears are meshed between the fourth and fifth-stage ring gears and the fifth-stage sun gear.

[0007] Furthermore, the fifth-stage planetary carrier of the five-stage reducer is rotatably connected to the fourth and fifth-stage gear rings via a rolling element assembly. The rolling element assembly includes spherical rolling elements and cylindrical rolling elements. The fifth-stage planetary carrier and the fourth and fifth-stage gear rings are respectively provided with a first spherical raceway, a second spherical raceway, and a cylindrical raceway. The first spherical raceway and the second spherical raceway are provided with an upper movable block and a lower movable block on the side near the fifth-stage planetary carrier. The upper movable block and the lower movable block are filling inlets for the spherical rolling elements. The spherical rolling elements are filled into the first spherical raceway and the second spherical raceway through the upper movable block and the lower movable block, respectively. The cylindrical raceway is filled with cylindrical rolling elements.

[0008] Furthermore, the fifth-stage gear shaft of the five-stage reducer is fixedly connected to the fifth-stage planetary carrier by bolts.

[0009] Furthermore, a locking cover is fixedly attached to the top of the output gear shaft, and the output gear shaft is fixedly connected to the locking cover by a locking rod arranged along its axial direction. A limiting pin is provided between the locking cover and the output gear shaft to achieve circumferential limiting.

[0010] Furthermore, in the first to fifth sun gears, a pad is provided between every two adjacent sun gears.

[0011] Furthermore, O-ring seals are installed between the upper body and the first, second, and third stage gear rings, between the first, second, and third stage gear rings and the fourth and fifth stage gear rings, between the fifth stage planetary carrier and the output gear shaft, between the output gear shaft and the locking cover, and between the fifth stage wheel shaft and the fifth stage planetary carrier. A skeleton oil seal is installed between the fifth stage planetary carrier and the fourth and fifth stage gear rings.

[0012] Compared with the prior art, the present invention has the following advantages: This invention significantly optimizes the axial and radial layout of the transmission chain by arranging and integrating five stages of reducers coaxially along the same axis within the reducer housing, achieving a high degree of integration of the multi-stage transmission mechanism. It eliminates spatial redundancy in traditional multi-stage transmissions, resulting in an extremely compact overall structure, significantly reduced dimensions, meeting the requirements of smaller installation spaces, and directly reducing the material used in the support structure and housing. It is more than 30% lighter than traditional structures, achieving structural lightweighting. This invention reduces structural redundancy and the number of parts through a coaxial integrated compact design. Combined with a multi-stage reducer design, it promotes the standardization and modularization of parts, directly reducing the weight of the reducer body and thus improving the structural safety and stability of the whole machine. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a front view of the lightweight yaw reducer in this invention; Figure 2 This is a first-view cross-sectional view of the lightweight yaw reducer in this invention; Figure 3 This is a partial cross-sectional view from a second perspective of the lightweight yaw reducer in this invention; In the diagram: 1. First-stage sun gear; 2. Bushing; 3. First-stage pad; 4. First-stage planetary gear; 5. First-stage axle; 6. Second-stage planetary gear; 7. Second-stage axle; 8. Second-stage pad; 9. Third-stage planetary gear; 10. Third-stage axle; 11. Third-stage pad; 12. Fourth-stage planetary gear; 13. Fourth-stage axle; 14. Fourth-stage pad; 15. Fifth-stage planetary gear; 16. Fifth-stage axle; 17. Fifth-stage planetary carrier; 18. Upper fuselage; 19. First-stage planetary carrier; 20. Second-stage... 21. Sun gear; 22. Second-stage planetary carrier; 23. Third-stage sun gear; 24. First, second, and third-stage gear rings; 25. Third-stage planetary carrier; 26. Fourth-stage planetary carrier; 27. Fifth-stage sun gear; 28. Fourth and fifth-stage gear rings; 29. ​​Locking cover; 30. Limit pin; 31. Spherical rolling element; 32. Upper movable block; 33. Lower movable block; 34. Cylindrical rolling element; 35. Positioning shaft; 36. Sealing cover; 37. Locking rod; 38. Output gear shaft. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0018] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0019] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0020] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0021] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0022] See appendix Figure 1-3This embodiment describes a lightweight yaw reducer, comprising a reduction housing, a multi-stage reduction mechanism, and an output gear shaft 38. The multi-stage reduction mechanism is rotatably connected to the reduction housing and is a multi-stage planetary gear train in series, including a first-stage reducer, a second-stage reducer, a third-stage reducer, a fourth-stage reducer, and a fifth-stage reducer. The first-stage reducer, second-stage reducer, third-stage reducer, fourth-stage reducer, and fifth-stage reducer are arranged sequentially along the same axis, with the output of the previous stage reducer meshing with the input of the adjacent next stage reducer. The output of the fifth-stage reducer meshes with the output gear shaft 38. The reduction housing includes an upper body 18, first, second, and third-stage gear rings 23, and fourth and fifth-stage gear rings 28, all of which are coaxial. The first-stage reducer, which is fixedly connected by bolts, includes a first-stage sun gear 1, multiple first-stage planetary gears 4, and a first-stage planetary carrier 19. The first-stage sun gear 1 is rotatably connected to the upper body 18 via bearings. The first, second, and third-stage gear rings 23 are coaxially arranged with the first-stage sun gear 1. Multiple first-stage planetary gears 4 mesh between the first-stage sun gear 1 and the first, second, and third-stage gear rings 23. Each first-stage planetary gear 4 has a first-stage axle 5 inserted inside it. Multiple cylindrical rolling elements are provided between the first-stage planetary gears 4 and the first-stage axle 5. The bottom of the first-stage axle 5 is fixedly connected to the first-stage planetary carrier 19. Washers are provided between the first-stage planetary gears 4 and the first-stage planetary carrier 19. The first-stage planetary carrier 19 engages with the spline at the input end of the second-stage sun gear 20 of the second-stage reducer via splines. Specifically, the power transmission paths of the first to fifth-stage reducers are the same, and their dimensions gradually increase. The reducer is mounted on the host machine via a fourth or fifth stage gear ring 28. The fourth or fifth stage gear ring 28 has a mounting stop, the center line of which does not coincide with the center line of the reducer. After mounting on the host machine, it can be used to adjust the center distance. The coaxial bolt connection of the reducer housing ensures precise alignment and meshing of each stage gear ring, significantly improving transmission accuracy and overall rigidity. The bottom of the first-stage axle 5 is provided with an elastic retaining ring, and the first-stage planetary carrier 19 is fixedly connected to the first-stage axle 5 via the elastic retaining ring. An annular groove is formed between the opposing surfaces of the first-stage planetary gear 4 and the first-stage axle 5, and the plurality of cylindrical rolling elements are installed within this groove. The splines on the inner circumference of the first-stage planetary carrier 19 and the splines circumferentially formed on the top of the second-stage sun gear 20 form a spline pair to achieve power transmission between them. In addition, the primary sun gear 1 is keyed to the motor output shaft, the upper body 18 is threaded to the motor, the primary sun gear 1 and the upper body 18 are rotatably connected by a bearing, the bearing is fixed to the upper body 18 by a spring retainer ring, the bearing is fixed to the primary sun gear 1 by a bushing 2, the upper body 18 is provided with a cavity for the expansion of lubricating oil, and a vent plug, an oil filler plug and an oil level indicator are also installed on it.The bearing is fixed to the primary sun gear 1 using a bushing 2, which can significantly increase the upper limit of the rotational speed. By installing multiple cylindrical rolling elements as bearings, the bearing has a small size and high load-bearing capacity, which directly reduces the material used in the support structure and achieves lightweighting of the structure.

[0023] By arranging the first to fifth stage reducers coaxially along the same axis and integrating them within the reducer housing, the axial and radial layout of the transmission chain is greatly optimized, achieving a high degree of integration of the multi-stage transmission mechanism. This eliminates spatial redundancy in traditional multi-stage transmissions, resulting in an extremely compact overall structure, significantly reduced dimensions, and meeting the requirements of smaller installation spaces. It also directly reduces the material used in the support structure and housing, achieving structural lightweighting. The compact design through coaxial integration reduces structural redundancy and the number of components. Combined with the multi-stage reducer design, it promotes the standardization and modularization of components, facilitating the use of lightweight materials and optimized structural design, directly reducing the weight of the reducer body and thus improving the overall structural safety and stability.

[0024] The transmission methods between two adjacent reducers, and between the fifth reducer and the output gear shaft 38, are the same as those between the first-stage reducer and the second-stage reducer.

[0025] The multiple second-stage planetary gears 6 of the two-stage reducer are all meshed between the first, second, and third-stage ring gears 23 and the second-stage sun gear 20; the multiple third-stage planetary gears 9 of the three-stage reducer are all meshed between the first, second, and third-stage ring gears 23 and the third-stage sun gear 22; the multiple fourth-stage planetary gears 12 of the four-stage reducer are all meshed between the fourth and fifth-stage ring gears 28 and the fourth-stage sun gear 25; and the multiple fifth-stage planetary gears 15 of the five-stage reducer are all meshed between the fourth and fifth-stage ring gears 28 and the fifth-stage sun gear 27.

[0026] The fifth-stage planetary carrier 17 of the five-stage reducer is rotatably connected to the fourth and fifth-stage gear ring 28 through a rolling element assembly. The rolling element assembly includes spherical rolling elements 31 and cylindrical rolling elements 34. The fifth-stage planetary carrier 17 and the fourth and fifth-stage gear ring 28 are respectively provided with a first spherical raceway, a second spherical raceway, and a cylindrical raceway. The first spherical raceway and the second spherical raceway are provided with an upper movable block 32 and a lower movable block 33 on the side of the fifth-stage planetary carrier 17. The upper movable block 32 and the lower movable block 33 are the filling inlets of the spherical rolling elements 31. The spherical rolling elements 31 are filled into the first spherical raceway and the second spherical raceway through the upper movable block 32 and the lower movable block 33 respectively. The cylindrical raceway is filled with cylindrical rolling elements 34. Specifically, after the first and second spherical raceways are filled, the upper movable block 32 and the lower movable block 33 are respectively installed on the fifth-stage planetary carrier 17 to prevent the spherical rolling elements 31 from coming off. Two radial holes are machined on the fifth-stage planetary carrier 17 as channels for installing the upper movable block 32 and the lower movable block 33, secured by two set screws. A positioning shaft 35 is installed to position the upper movable block 32 and the lower movable block 33. The bottom of the radial holes is sealed by a sealing cap 36. The spherical rolling elements 31 and the cylindrical rolling elements 34 are used as bearings to ensure that the fourth and fifth stage gear rings 28 remain stationary during the rotation of the fifth-stage reducer. By replacing bearings with the spherical rolling elements 31 and the cylindrical rolling elements 34, the overall structure is small and lightweight, resulting in a highly compact structure, significantly reducing the external dimensions, and directly reducing the material used in the supporting structure, thus achieving structural lightweighting.

[0027] The fifth-stage axle 16 and the fifth-stage planetary carrier 17 are fixedly connected by bolts. The bolted connection ensures the rigidity of power transmission from the planetary gears to the planetary carrier, effectively preventing relative rotation or displacement and enhancing transmission reliability.

[0028] A locking cover 29 is fixedly attached to the top of the output gear shaft 38. The output gear shaft 38 is fixedly connected to the locking cover 29 via a locking rod 37 arranged along its axial direction, and a limiting pin 30 is provided between the locking cover 29 and the output gear shaft 38 to achieve circumferential limiting. Specifically, a set screw is provided through the bottom of the locking rod 37, and the other end of the set screw is connected to the output gear shaft 38. Through the double connection structure of the locking rod 37 and the limiting pin 30, reliable axial fastening and precise circumferential limiting are achieved respectively, effectively preventing loosening and relative displacement at the connection, and ensuring transmission accuracy and operational stability.

[0029] In the first-stage to fifth-stage sun gears 27, a shim is provided between every two adjacent sun gears. Specifically, the shims include a first-stage shim 3, a second-stage shim 8, a third-stage shim 11, and a fourth-stage shim 14. A first-stage shim 3 is provided between the first-stage sun gear 1 and the second-stage sun gear 20; a second-stage shim 8 is provided between the second-stage sun gear 20 and the third-stage sun gear 22; a third-stage shim 11 is provided between the third-stage sun gear 22 and the fourth-stage sun gear 25; and a fourth-stage shim 14 is provided between the fourth-stage sun gear 25 and the fifth-stage sun gear 27. By precisely adjusting the axial clearance between each stage of the sun gears using these shims, the independence of each stage of transmission is ensured, improper interference between gears is prevented, and the overall reliability and motion accuracy of the multi-stage transmission system are improved.

[0030] O-rings are installed between the upper body 18 and the first, second, and third stage gear rings 23; between the first, second, and third stage gear rings 23 and the fourth and fifth stage gear rings 28; between the fifth stage planetary carrier 17 and the output gear shaft 38; between the output gear shaft 38 and the locking cover 29; and between the fifth stage gear shaft 16 and the fifth stage planetary carrier 17. A skeleton oil seal is installed between the fifth stage planetary carrier 17 and the fourth and fifth stage gear rings 28. The use of O-rings and skeleton oil seals at static and dynamic connection points respectively constitutes a complete anti-leakage barrier, significantly improving the sealing reliability of the reducer during long-term operation, effectively lubricating and preventing the intrusion of external contaminants.

[0031] The present invention discloses a lightweight yaw reducer, the specific transmission path of which is described below: The motor output shaft drives the first-stage sun gear 1 to rotate; the first-stage sun gear 1 transmits power to each first-stage planetary gear 4 through gear meshing; the first-stage planetary gear 4 transmits power to the first-stage planetary carrier 19 through the first-stage shaft 5; the first-stage planetary carrier 19 transmits power to the second-stage sun gear 20 through splines; the second-stage sun gear 20 transmits power to each second-stage planetary gear 6 through gear meshing; the second-stage planetary gear 6 transmits power to the second-stage planetary carrier 21 through the second-stage shaft 7; the second-stage planetary carrier 21 transmits power to the third-stage sun gear 22 through splines; the third-stage sun gear 22 transmits power to each third-stage... Planetary gear 9, the third-stage planetary gear 9 transmits power to the third-stage planetary carrier 24 through the third-stage gear shaft 10, the third-stage planetary carrier 24 transmits power to the fourth-stage sun gear 25 through splines; the fourth-stage sun gear 25 transmits power to each fourth-stage planetary gear 12 through gear meshing, the fourth-stage planetary gear 12 transmits power to the fourth-stage planetary carrier 26 through the fourth-stage gear shaft 13, the fourth-stage planetary carrier 26 transmits power to the fifth-stage sun gear 27 through splines; the fifth-stage sun gear 27 transmits power to each fifth-stage planetary gear 15 through gear meshing, the fifth-stage planetary gear 15 transmits power to the fifth-stage planetary carrier 17 through the fifth-stage gear shaft 16, and the fifth-stage planetary carrier 17 transmits power to the output gear shaft 38 through splines.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. A lightweight yaw reducer, characterized in that: The system includes a reduction housing, a multi-stage reduction mechanism, and an output gear shaft (38). The multi-stage reduction mechanism is rotatably connected to the reduction housing. The multi-stage reduction mechanism is a multi-stage planetary gear train in series, comprising a first-stage reducer, a second-stage reducer, a third-stage reducer, a fourth-stage reducer, and a fifth-stage reducer. The first-stage reducer, second-stage reducer, third-stage reducer, fourth-stage reducer, and fifth-stage reducer are arranged sequentially along the same axis. The output of the previous stage reducer meshes with the input of the adjacent next stage reducer. The output of the fifth-stage reducer meshes with the output gear shaft (38). The reduction housing includes an upper body (18), first, second, and third-stage gear rings (23), and fourth and fifth-stage gear rings (28). The upper body (18), first, second, and third-stage gear rings (23), and fourth and fifth-stage gear rings (28) are coaxially arranged and fixedly connected by bolts. The first-stage reducer includes a... The device consists of a primary sun gear (1), multiple primary planetary gears (4), and a primary planetary carrier (19). The primary sun gear (1) is rotatably connected to the upper body (18) via bearings. The first, second, and third stage gear rings (23) are coaxially arranged with the primary sun gear (1). Multiple primary planetary gears (4) mesh between the primary sun gear (1) and the first, second, and third stage gear rings (23). Each primary planetary gear (4) has a primary gear shaft (5) inserted inside it. Multiple cylindrical rolling elements are provided between the primary planetary gears (4) and the primary gear shafts (5). The bottom of the primary gear shafts (5) is fixedly connected to the primary planetary carrier (19). Washers are provided between the primary planetary gears (4) and the primary planetary carrier (19). The primary planetary carrier (19) is driven by the splines on it meshing with the splines at the input end of the secondary sun gear (20) of the secondary reducer.

2. The lightweight yaw reducer according to claim 1, characterized in that: The transmission methods between two adjacent reducers, and between the fifth reducer and the output gear shaft (38), are the same as those between the first reducer and the second reducer.

3. The lightweight yaw reducer according to claim 1, characterized in that: The multiple secondary planetary gears (6) of the secondary reducer are all meshed between the first, second, and third stage gear rings (23) and the secondary sun gear (20). The multiple third stage planetary gears (9) of the tertiary reducer are all meshed between the first, second, and third stage gear rings (23) and the third stage sun gear (22). The multiple fourth stage planetary gears (12) of the tertiary reducer are all meshed between the fourth and fifth stage gear rings (28) and the fourth stage sun gear (25). The multiple fifth stage planetary gears (15) of the tertiary reducer are all meshed between the fourth and fifth stage gear rings (28) and the fifth stage sun gear (27).

4. A lightweight yaw reducer according to claim 1, characterized in that: The fifth-stage planetary carrier (17) of the five-stage reducer is rotatably connected to the fourth and fifth-stage gear ring (28) through a rolling element assembly. The rolling element assembly includes spherical rolling elements (31) and cylindrical rolling elements (34). The fifth-stage planetary carrier (17) and the fourth and fifth-stage gear ring (28) are respectively provided with a first spherical raceway, a second spherical raceway and a cylindrical raceway. The first spherical raceway and the second spherical raceway are provided with an upper movable block (32) and a lower movable block (33) on the side of the fifth-stage planetary carrier (17) that is close to the first spherical raceway. The upper movable block (32) and the lower movable block (33) are the filling inlets of the spherical rolling elements (31). The spherical rolling elements (31) are filled into the first spherical raceway and the second spherical raceway through the upper movable block (32) and the lower movable block (33). The cylindrical raceway is filled with cylindrical rolling elements (34).

5. A lightweight yaw reducer according to claim 4, characterized in that: The fifth-stage gear axle (16) of the five-stage reducer is fixedly connected to the fifth-stage planetary carrier (17) by bolts.

6. A lightweight yaw reducer according to claim 5, characterized in that: A locking cover (29) is fixedly attached to the top of the output gear shaft (38). The output gear shaft (38) is fixedly connected to the locking cover (29) by a locking rod (37) arranged along its axial direction. A limiting pin (30) is provided between the locking cover (29) and the output gear shaft (38) to achieve circumferential limiting.

7. A lightweight yaw reducer according to claim 3, characterized in that: In the first-stage sun gear (1) to the fifth-stage sun gear (27), a pad is provided between every two adjacent sun gears.

8. A lightweight yaw reducer according to claim 6, characterized in that: O-rings are installed between the upper body (18) and the first, second, and third stage gear rings (23), between the first, second, and third stage gear rings (23) and the fourth and fifth stage gear rings (28), between the fifth stage planetary carrier (17) and the output gear shaft (38), between the output gear shaft (38) and the locking cover (29), and between the fifth stage wheel shaft (16) and the fifth stage planetary carrier (17). A skeleton oil seal is installed between the fifth stage planetary carrier (17) and the fourth and fifth stage gear rings (28).

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