High-bearing-capacity integrated light-weight yaw speed reducer output end structure

Abstract

The invention relates to the technical field of speed reducers, in particular to a high-bearing-capacity integrated light-weight yaw speed reducer output end structure. The structure comprises a sun gear, a planet gear, a planet gear shaft, a planet carrier, an output gear shaft and a supporting outer ring. The lower end face of the planet carrier and the end face of the gear section of the output gear shaft are limited. And a raceway is processed between the support outer ring and the planet carrier, and a spherical rolling body and a cylindrical rolling body are arranged between the support outer ring and the planet carrier. The sun gear is rotationally arranged on the locking cover in a sleeving mode, the locking rod is in threaded connection with the locking cover, and double locking is achieved through the jacking screw and the limiting pin. The planet carrier is provided with an axial hole and a radial hole, and a roller path is blocked through a movable block, a positioning shaft and a set screw. A framework oil seal is arranged between the supporting outer ring and the planet carrier, static sealing rings are arranged on other matching faces, and reliable sealing is guaranteed. The yaw speed reducer is compact in structure, high in integration degree, high in bearing capacity and rigidity, capable of effectively reducing the size and weight and suitable for the fan yaw speed reducer.

Description

Technical Field

[0001] This invention relates to the field of speed reducer technology, and in particular to an output end structure of a high-load-bearing integrated lightweight yaw speed reducer. Background Technology

[0002] Yaw reducers are used in the yaw drive system of wind turbines. Typically, multiple yaw reducers mesh simultaneously with the large gear ring of the slewing bearing to drive the wind turbine nacelle to rotate and adjust for wind conditions. The output gear of the yaw reducer bears both torque and bending moment and needs to switch between forward and reverse rotation. Most existing yaw reducers use a design where two tapered bearings are mounted at the output end and locked with nuts. This structure has low component integration and a large bearing span, resulting in a large footprint. A few use angular contact or deep groove ball bearings with bolts to fix the output gear. This structure can effectively reduce space, but the bearing load capacity is insufficient, the overall rigidity is poor, and there is a risk of the output gear falling off.

[0003] With the development of the wind power industry, the requirements for the weight and size of yaw gearboxes are becoming increasingly stringent. Although the existing yaw gearbox output structure has undergone extensive use and verification, its weight and size have been largely reduced to their limits. Innovating the structure and improving the integration of the gearbox output end, while ensuring load-bearing capacity, is an effective way to further reduce the weight and size of gearboxes. Summary of the Invention

[0004] In order to balance the load-bearing capacity and integration of the yaw reducer output end, this invention provides a high-load-bearing integrated lightweight yaw reducer output end structure.

[0005] Therefore, the present invention provides the following technical solution:

[0006] A high-load-bearing integrated lightweight yaw reducer output end structure includes a sun gear, planet gears, planet gear shafts, planet carriers, output gear shafts, and a supporting outer ring; The output gear shaft has an axial stepped hole. The upper section of the stepped hole has a smaller diameter than the lower section. A locking rod passes through the upper section of the stepped hole. The lower end of the locking rod has a flange located in the lower section of the stepped hole. The upper end of the locking rod has a threaded section. A locking cover is threaded onto the threaded section. A limiting pin is provided between the locking cover and the output gear shaft. The locking cover is circumferentially fixed to the output gear shaft by the limiting pin. The sun gear is mounted on the locking cover. The output gear shaft includes a gear section and a limiting section. The limiting section is provided with an external spline in the circumferential direction, and the planet carrier is provided with an internal spline on the inner side. The planet carrier is fitted onto the limiting section, and the internal spline and the external spline are circumferentially limited and matched. The outer ring of the support is fitted onto the planetary carrier, and an oil passage gap is left between the outer ring of the support and the planetary carrier. The inner side of the outer ring of the support is provided with an inner raceway groove, and the outer side of the planetary carrier is provided with an outer raceway groove. The inner raceway groove and the outer raceway groove cooperate to form a raceway. The raceway contains rolling elements, and an oil passage gap is provided between the rolling elements and the raceway. An internal gear ring is also provided on the inner side of the outer ring; Several planetary gear shafts are mounted around the sun gear on the planetary carrier. Planetary gears are rotatably mounted on the planetary gear shafts. The planetary gears mesh with both the internal gear ring supporting the outer ring and the sun gear.

[0007] Furthermore, the raceway includes a cylindrical rolling element raceway and at least two spherical rolling element raceways. The cylindrical rolling element raceway contains a first cylindrical rolling element (which mainly bears radial loads), and the spherical rolling element raceway contains a spherical rolling element (which bears both radial and axial loads).

[0008] Furthermore, the planetary carrier has an axial hole, and the planetary carrier has a radial hole at the corresponding spherical raceway. The axial hole communicates with the spherical raceway through the radial hole. A movable block is provided in the radial hole, and a positioning shaft is provided in the axial hole.

[0009] Furthermore, the planetary carrier is provided with an axial threaded hole at the position corresponding to the radial hole. The axial threaded hole communicates with the radial hole. A set screw is installed in the axial threaded hole. After the set screw is tightened, it abuts against the movable block (fixing the position of the movable block). The axial hole is provided with retaining ring grooves at both ends corresponding to the positioning shaft. A first elastic retaining ring is inserted in the retaining ring groove (to axially limit the positioning shaft, and at the same time, the positioning shaft will also radially limit the movable block).

[0010] Furthermore, a sealing cap is installed at the lower part of the axial hole.

[0011] Furthermore, the planetary gear shaft is provided with two outer cylindrical raceway grooves, and the inner side of the planetary gear is provided with two corresponding inner cylindrical raceway grooves. A second cylindrical rolling element is installed between each outer cylindrical raceway groove and the corresponding inner cylindrical raceway groove. A groove is provided on the inner side of the planetary gear, located between the two inner cylindrical raceway grooves. A second elastic retaining ring is installed in the groove, and washers are installed on both axial sides of the second elastic retaining ring. (The washers reduce the friction between the second cylindrical rolling element and the second elastic retaining ring).

[0012] Furthermore, the planet carrier has a countersunk hole at the position corresponding to the planetary gear shaft, and a fixing screw passes through the countersunk hole and is threadedly connected to the planetary gear shaft.

[0013] Furthermore, an integrally formed mounting ring is provided on the outer side of the supporting outer ring, and mounting holes are provided on the mounting ring.

[0014] Furthermore, a skeleton oil seal is installed between the outer ring of the support and the planetary carrier; static sealing rings are installed between the planetary carrier and the output gear shaft, between the locking cover and the output gear shaft, and between the planetary gear shaft and the planetary carrier.

[0015] Furthermore, a tightening screw is installed on the flange of the locking rod. After the tightening screw is tightened, it abuts against the output gear shaft (the tightening screw and the limit pin achieve double anti-loosening of the locking cover and the output gear shaft).

[0016] Advantages and positive effects of the present invention: This application forms a raceway between the outer ring and the planetary carrier, and arranges spherical rolling elements and a first cylindrical rolling element in the raceway, replacing the existing installation form of two tapered roller bearings. While reducing the radial and axial space, it can simultaneously bear radial and axial loads, resulting in stronger overall rigidity and avoiding the defects of insufficient load-bearing capacity and poor rigidity of existing bearings.

[0017] In this application, the output gear shaft and the planetary carrier are circumferentially limited by external and internal splines, as well as end face limiting. Compared with the existing flat key connection method, the transmission contact area is larger and the force is more uniform. It can effectively withstand the compound torque and bending moment caused by frequent forward and reverse rotation under yaw conditions, and has higher load-bearing capacity and more stable operation.

[0018] This application adopts a multi-reliable structure with a locking rod and locking cover threaded fastening, combined with a top screw to prevent loosening and a limit pin for circumferential fixation. It has high connection strength and good anti-loosening effect, and can adapt to the harsh working conditions of long-term heavy load and alternating forward and reverse rotation of the fan. It solves the problems of low connection strength, poor reliability and risk of output gear falling off in the prior art.

[0019] This application arranges locking components such as locking covers and locking rods inside the hollow space of the sun gear without adding extra axial length, thereby maximizing the utilization of axial space, further compressing the overall structural size, breaking through the compression bottleneck of existing structures in axial space, and better meeting the development requirements of the wind power industry for yaw reducers with high integration and small size. Attached Figure Description

[0020] 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.

[0021] Figure 1 This invention provides a three-dimensional structural diagram of the output end of a high-load-bearing integrated lightweight yaw reducer.

[0022] Figure 2 A cross-sectional view of the output end structure of a high-load-bearing integrated lightweight yaw reducer provided by the present invention. Figure 1 .

[0023] Figure 3 A cross-sectional view of the output end structure of a high-load-bearing integrated lightweight yaw reducer provided by the present invention. Figure 2 .

[0024] In the diagram: 1. Sun gear; 2. Planet gears; 3. Planet gear shaft; 4. Support outer ring; 5. Spherical rolling element; 6. First cylindrical rolling element; 7. Planet carrier; 8. Locking cover; 9. Locking rod; 10. Positioning shaft; 11. Moving block; 12. Sealing cover; 13. Output gear shaft; 14. Limit pin; 15. Flange; 16. Stepped hole; 161. Lower hole section; 162. Upper hole section; 17. Threaded section; 18. Limiting section; 19. Internal gear ring; 20. Set screw; 21. First elastic retaining ring; 22. Second elastic retaining ring; 23. Fixing screw; 24. Mounting ring; 25. Mounting hole; 26. Skeleton oil seal; 27. Tightening screw; 28. Gear section; 29. ​​Second cylindrical rolling element. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0026] This invention provides a high-load-bearing integrated lightweight yaw reducer output end structure, such as... Figure 1-3 As shown, it includes a sun gear 1, planet gears 2, planet gear shafts 3, planet carriers 7, output gear shafts 13, and a supporting outer ring 4.

[0027] The outer side of the supporting outer ring 4 is integrally formed with a mounting ring 24, and the mounting ring 24 has a mounting hole 25.

[0028] The output gear shaft 13 has an axial stepped hole 16. The upper section 162 of the stepped hole 16 has a smaller diameter than the lower section 161. A locking rod 9 passes through the upper section 162 of the stepped hole 16. A flange 15 is provided at the lower end of the locking rod 9. The flange 15 is located in the lower section 161 of the stepped hole 16. A tightening screw 27 is installed on the flange 15 of the locking rod 9. After the tightening screw 27 is tightened, it abuts against the output gear shaft 13.

[0029] The upper end of the locking rod 9 is provided with a threaded section 17, and a locking cover 8 is threadedly installed on the threaded section 17. A limit pin 14 is provided between the locking cover 8 and the output gear shaft 13. The locking cover 8 is circumferentially fixed to the output gear shaft 13 by the limit pin 14. The sun gear 1 is rotated and fitted onto the locking cover 8.

[0030] The output gear shaft 13 includes a gear section 28 and a limiting section 18. The diameter of the gear section 28 is larger than the diameter of the limiting section 18. The limiting section 18 is provided with an external spline in the circumference. The planet carrier 7 is provided with an internal spline on the inner side. The planet carrier 7 is fitted onto the limiting section 18, and the internal spline and the external spline are circumferentially limited and matched. The lower end face of the planet carrier 7 contacts and limits the upper end face of the gear section 28.

[0031] The outer ring 4 is mounted on the planetary carrier 7, and an oil passage clearance is provided between the outer ring 4 and the planetary carrier 7 to provide space for lubrication and heat dissipation of the rolling elements. The inner side of the outer ring 4 is provided with an inner raceway groove, and the outer side of the planetary carrier 7 is provided with a corresponding outer raceway groove. The inner raceway groove and the outer raceway groove cooperate to form a raceway, in which rolling elements are installed. The raceway includes a cylindrical rolling element raceway and at least two spherical rolling element raceways. The cylindrical rolling element raceway contains a first cylindrical rolling element 6, and the spherical rolling element raceways contain spherical rolling elements 5.

[0032] An oil passage clearance is provided between the rolling elements and the raceway; an internal gear ring 19 is also provided on the inner side of the supporting outer ring 4; several planetary gear shafts 3 are mounted around the sun gear 1 on the planetary carrier 7, and planetary gears 2 are rotatably mounted on the planetary gear shafts 3. The planetary gears 2 mesh with both the internal gear ring 19 of the supporting outer ring 4 and the sun gear 1. A countersunk hole is provided on the planetary carrier 7 at the position corresponding to the planetary gear shaft 3, and a fixing screw 23 passes through the countersunk hole and is threadedly connected to the planetary gear shaft 3.

[0033] The planetary carrier 7 has an axial hole and a radial hole at the corresponding spherical raceway. The axial hole communicates with the spherical raceway through the radial hole. A movable block 11 is provided in the radial hole, and a positioning shaft 10 is provided in the axial hole. The planetary carrier 7 has an axial threaded hole at the position corresponding to the radial hole. The axial threaded hole communicates with the radial hole, and a set screw 20 is installed in the axial threaded hole. After the set screw 20 is tightened, it abuts against the movable block 11. Retaining ring grooves are provided at both ends of the positioning shaft 10 in the axial hole, and a first elastic retaining ring 21 is engaged in the retaining ring groove.

[0034] A sealing cap 12 is installed at the lower part of the axial hole.

[0035] The planetary gear shaft 3 is provided with two outer cylindrical raceway grooves, and the inner side of the planetary gear 2 is provided with two inner cylindrical raceway grooves. A second cylindrical rolling element 29 is installed between each outer cylindrical raceway groove and the corresponding inner cylindrical raceway groove. A groove is provided on the inner side of the planetary gear 2 and between the two inner cylindrical raceway grooves. A second elastic retaining ring 22 is installed in the groove. Washers are installed on both sides of the second elastic retaining ring 22 along its axial direction.

[0036] A skeleton oil seal 26 is installed between the outer ring 4 and the planetary carrier 7; static seals are installed between the planetary carrier 7 and the output gear shaft 13, between the locking cover 8 and the output gear shaft 13, and between the planetary gear shaft 3 and the planetary carrier 7.

[0037] Working principle: The outer ring 4 is fixedly mounted on the main unit by an integrally formed mounting ring 24 and mounting hole 25 on its outer side.

[0038] External power drives the sun gear 1 to rotate around the locking cover 8. The sun gear 1 simultaneously meshes with several planet gears 2 on the planet carrier 7, causing the planet gears 2 to rotate around their own planet gear shafts 3. Since the planet gears 2 simultaneously mesh with the internal gear ring 19 supporting the outer ring 4, under the limiting action of the fixed internal gear ring 19, the planet gears 2 revolve around the sun gear 1, thereby driving the planet carrier 7 to rotate synchronously. The planet carrier 7 transmits power to the output gear shaft 13 through the circumferential engagement of the internal spline with the external spline of the limiting section 18 of the output gear shaft 13. Finally, the gear section 28 of the output gear shaft 13 meshes with the large gear ring of the wind turbine rotation support, realizing the yaw rotation of the wind turbine nacelle.

[0039] The inner and outer raceway grooves machined on the inner side of the supporting outer ring 4 and the outer side of the planetary carrier 7 respectively form a raceway. The first cylindrical rolling element 6 in the raceway mainly bears the radial load, while the spherical rolling element 5 in the raceway bears both radial and axial loads. This replaces the traditional external bearing and achieves smooth relative rotation between the supporting outer ring 4 and the planetary carrier 7. The oil passage clearance between the rolling elements and the raceway ensures smooth flow of lubricating oil and reduces friction and wear. The planetary gear 2 and the planetary gear shaft 3 achieve rolling engagement through the second cylindrical rolling element 29, ensuring the flexible rotation of the planetary gear 2. At the same time, the second elastic retaining ring 22 between the two inner cylindrical raceway grooves axially limits the second cylindrical rolling element 29 to prevent axial movement. The washer reduces the end face friction between the second elastic retaining ring 22 and the second cylindrical rolling element 29.

[0040] The stepped hole 16 inside the output gear shaft 13 provides installation space for the locking rod 9. The flange 15 at the lower end of the locking rod 9 is limited to the lower section 161 of the stepped hole 16, and the upper end is threadedly connected to the locking cover 8 through the threaded section 17 to achieve axial pre-tightening. The locking cover 8 is circumferentially fixed to the output gear shaft 13 by the limiting pin 14 to prevent relative rotation between the two. After the tightening screw 27 on the flange 15 of the locking rod 9 is tightened, it abuts against the output gear shaft 13, effectively preventing the threads between the locking rod 9 and the locking cover 8 from loosening, ensuring the connection reliability under long-term heavy load and alternating forward and reverse operation conditions. The planetary gear shaft 3 is installed in the hole of the planet carrier 7 by interference fit. The fixing screw 23 is inserted in the countersunk hole at the corresponding position of the planet carrier 7 and threadedly connected to the planetary gear shaft 3 to prevent the planetary gear shaft 3 from axial movement.

[0041] The spherical rolling element 5 is installed into the raceway through the axial through hole on the planetary carrier 7 and the radial hole corresponding to the spherical raceway. After installation, the movable block 11 is installed into the radial hole through the axial through hole to seal the raceway and ensure the normal operation of the spherical rolling element 5. The positioning shaft 10 is installed in the axial hole to radially limit the movable block 11. The set screw 20 is installed in the axial threaded hole of the planetary carrier 7 corresponding to the radial hole position. After tightening, it abuts against the movable block 11 to fix the movable block 11. The sealing cover 12 at the bottom of the axial hole seals the axial hole to prevent dust from entering and lubricating oil from leaking. The first elastic retaining rings 21 at both ends of the positioning shaft 10 are engaged in the retaining ring grooves of the axial hole to axially limit the positioning shaft 10 and prevent it from moving.

[0042] The skeleton oil seal 26 installed between the outer ring 4 and the planetary carrier 7 achieves dynamic sealing to prevent lubricating oil leakage when the two rotate relative to each other; static sealing rings are installed between the planetary carrier 7 and the output gear shaft 13, between the locking cover 8 and the output gear shaft 13, and between the planetary gear shaft 3 and the planetary carrier 7 to achieve sealing of each static mating surface, ensuring the overall sealing performance of the output end structure, preventing lubricating oil leakage and the entry of external impurities, and improving the service life of the structure.

[0043] 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 high-load-bearing integrated lightweight yaw reducer output end structure, characterized in that, It includes a sun gear (1), planet gears (2), planet gear shafts (3), planet carriers (7), output gear shafts (13), and a support outer ring (4); The output gear shaft (13) is provided with an axial stepped hole (16). The upper hole section (162) of the stepped hole (16) has a smaller diameter than the lower hole section (161). A locking rod (9) is provided through the upper hole section (162) of the stepped hole (16). A flange (15) is provided at the lower end of the locking rod (9). The flange (15) is located in the lower hole section (161) of the stepped hole (16). A threaded section (17) is provided at the upper end of the locking rod (9). A locking cover (8) is threaded on the threaded section (17). A limiting pin (14) is provided between the locking cover (8) and the output gear shaft (13). The locking cover (8) is circumferentially fixed to the output gear shaft (13) by the limiting pin (14). The sun gear (1) is rotated and fitted onto the locking cover (8); The output gear shaft (13) includes a gear section (28) and a limiting section (18). The diameter of the gear section (28) is larger than the diameter of the limiting section (18). The limiting section (18) is provided with an external spline in the circumferential direction. The planet carrier (7) is provided with an internal spline on the inner side. The planet carrier (7) is fitted onto the limiting section (18), and the internal spline and the external spline are circumferentially limited and matched. The lower end face of the planet carrier (7) is in contact with the upper end face of the gear section (28) for limiting. The outer ring (4) is fitted onto the planetary carrier (7), and there is an oil passage gap between the outer ring (4) and the planetary carrier (7). The inner side of the outer ring (4) is provided with an inner raceway groove, and the outer side of the planetary carrier (7) is provided with an outer raceway groove. The inner raceway groove and the outer raceway groove cooperate to form a raceway. The raceway contains rolling elements, and there is an oil passage gap between the rolling elements and the raceway. An internal gear ring (19) is also provided on the inner side of the outer ring (4); Several planetary gear shafts (3) are mounted around the sun gear (1) on the planetary carrier (7). Planetary gears (2) are rotatably mounted on the planetary gear shafts (3). The planetary gears (2) mesh with the internal gear ring (19) supporting the outer ring (4) and the sun gear (1).

2. The output end structure of a high-load-bearing integrated lightweight yaw reducer according to claim 1, characterized in that, The raceway includes a cylindrical rolling element raceway and at least two spherical rolling element raceways. The cylindrical rolling element raceway contains a first cylindrical rolling element (6), and the spherical rolling element raceway contains a spherical rolling element (5).

3. The output end structure of a high-load-bearing integrated lightweight yaw reducer according to claim 2, characterized in that, The planetary carrier (7) has an axial hole and a radial hole at the corresponding spherical raceway. The axial hole is connected to the spherical raceway through the radial hole. A movable block (11) is provided in the radial hole, and a positioning shaft (10) is provided in the axial hole.

4. The output end structure of a high-load-bearing integrated lightweight yaw reducer according to claim 3, characterized in that, The planetary carrier (7) is provided with an axial threaded hole at the position corresponding to the radial hole. The axial threaded hole is connected to the radial hole. A set screw (20) is installed in the axial threaded hole. After the set screw (20) is tightened, it abuts against the movable block (11). The two ends of the axial hole corresponding to the positioning shaft (10) are provided with retaining ring grooves. A first elastic retaining ring (21) is locked in the retaining ring groove.

5. The output end structure of a high-load-bearing integrated lightweight yaw reducer according to claim 3, characterized in that, A sealing cap (12) is installed at the lower part of the axial hole.

6. The output end structure of a high-load-bearing integrated lightweight yaw reducer according to claim 1, characterized in that, The planetary gear shaft (3) is provided with two outer cylindrical raceway grooves, and the inner side of the planetary gear (2) is provided with two inner cylindrical raceway grooves. A second cylindrical rolling element (29) is installed between each outer cylindrical raceway groove and the corresponding inner cylindrical raceway groove. A groove is provided on the inner side of the planetary gear (2) and between the two inner cylindrical raceway grooves. A second elastic retaining ring (22) is installed in the groove. Washers are installed on both sides of the second elastic retaining ring (22) along its axial direction.

7. The output end structure of a high-load-bearing integrated lightweight yaw reducer according to claim 1, characterized in that, The planet carrier (7) has a countersunk hole at the position corresponding to the planetary gear shaft (3), and a fixing screw (23) is inserted in the countersunk hole. The fixing screw (23) is threadedly connected to the planetary gear shaft (3).

8. The output end structure of a high-load-bearing integrated lightweight yaw reducer according to claim 1, characterized in that, The outer side of the support outer ring (4) is integrally formed with a mounting ring (24), and a mounting hole (25) is provided on the mounting ring (24).

9. The output end structure of a high-load-bearing integrated lightweight yaw reducer according to claim 1, characterized in that, A skeleton oil seal (26) is installed between the outer support ring (4) and the planet carrier (7); static sealing rings are installed between the planet carrier (7) and the output gear shaft (13), between the locking cover (8) and the output gear shaft (13), and between the planet gear shaft (3) and the planet carrier (7).

10. The output end structure of a high-load-bearing integrated lightweight yaw reducer according to claim 1, characterized in that, A tightening screw (27) is installed on the flange (15) of the locking rod (9), and the tightening screw (27) abuts against the output gear shaft (13) after being tightened.

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