A pitch reducer structure

Abstract

This utility model relates to the field of wind turbine pitch reducer technology, specifically to a pitch reducer structure, including an output shaft and a housing. One end of the output shaft is connected to a planetary carrier. The output shaft includes a first connecting section and a second connecting section arranged sequentially from the outside to the inside along the axial direction. The second connecting section has external threads, and the inner wall of the planetary carrier has internal threads. The first connecting section has multiple external pin holes, and the planetary carrier has multiple internal pin holes. Matching internal and external pin holes together form mounting pin holes, with locating pins inside. The planetary carrier and the output shaft are axially positioned by the matching of internal and external threads, and circumferentially positioned by the matching of mounting pin holes and locating pins. A large tapered bearing and a small tapered bearing are provided between the housing and the output shaft, with the small tapered bearing positioned close to the planetary carrier. The reducer components in this design have reliable positioning, low risk of component failure, high safety, and can significantly reduce the risk of off-center loading.

Description

Technical Field

[0001] This utility model relates to the field of wind power pitch reducer technology, and specifically provides a pitch reducer structure. Background Technology

[0002] Wind energy is a clean and renewable energy source, and wind power generation is gradually becoming an important way for mankind to develop and utilize clean energy. The wind turbine blade pitch reducer is a key transmission component in the wind power generation system. It is used to convert the high-speed, low-torque rotation of the motor into the low-speed, high-torque rotation of the blade root bearing to adjust the direction and angle of the wind turbine blade.

[0003] In existing pitch reducer structures, after the small tapered bearing is assembled on the output shaft, round nuts, gear sleeves, etc., are still required. The assembled three-stage planetary gear unit and output shaft are then assembled together via splines. The three-stage sun gear unit is then assembled onto the three-stage planetary gear unit. The three-stage planetary gear unit includes components such as a three-stage planet carrier, baffles, ball tops, planet gears, and planet bearings. The three-stage sun gear unit includes a three-stage sun gear and a top block. The existing structure has the following problems:

[0004] 1. It can easily cause the third-stage planetary components to float up and down, increasing the uncertainty of product operation;

[0005] 2. The point contact fit between the dome and the top block makes the meshing of the third-stage sun gear and planet gears prone to off-center loading, which greatly increases the risk of component failure.

[0006] Therefore, how to design a pitch reducer structure with high safety and high product positioning reliability is an urgent problem to be solved. Utility Model Content

[0007] To solve the above problems, this utility model provides a variable pitch reducer structure that can prevent planetary components from floating up and down, reduce the risk of component failure, and greatly improve the positioning reliability of the product.

[0008] This utility model provides a pitch reducer structure, including an output shaft and a housing located outside the output shaft. One end of the output shaft is connected to a planetary carrier located inside the housing. The planetary carrier includes multiple planetary gears, with a sun gear between the planetary gears. One end of the output shaft includes a connecting section one and a connecting section two arranged sequentially from the outside to the inside along the axial direction. The connecting section two has an external thread, and the inner wall of the planetary carrier has an internal thread that matches the external thread on the connecting section two. The connecting section one has multiple external pin holes, and the planetary carrier has multiple internal pin holes that match the multiple external pin holes. The matching internal pin holes and external pin holes together form a mounting pin hole, and a positioning pin is provided in the mounting pin hole. The planetary carrier and the output shaft are axially positioned by the matching of the internal and external threads, and circumferentially positioned by the matching of the mounting pin hole and the positioning pin. A large tapered bearing is provided between the housing and the output shaft, and a small tapered bearing is also provided between the housing and the output shaft, located between the planetary carrier and the large tapered bearing. The small tapered bearing is located close to the planetary carrier, and a connecting gasket abuts between the small tapered bearing and the planetary carrier.

[0009] Furthermore, the sun gear abuts against the outer end face of the connecting section one in the output shaft.

[0010] Furthermore, the connecting section one has a straight wall structure, with multiple outer pin holes evenly arranged along the circumference of the outer wall of the connecting section one, and inner pin holes evenly arranged along the circumference of the inner wall of the planetary carrier.

[0011] Furthermore, connecting section one and connecting section two are stepped shaft structures, with the inner diameter of connecting section one and connecting section two increasing sequentially from the outside to the inside along the axial direction.

[0012] Furthermore, the locating pin and the mounting pin hole are connected by an interference fit.

[0013] Furthermore, the planetary carrier is equipped with multiple connecting posts that match multiple planetary gears. Planetary bearings are installed inside the planetary gears. The planetary gears are mounted on the connecting posts through the planetary bearings, and the planetary gears are secured to the connecting posts by snap rings.

[0014] Furthermore, a slot is provided on the connecting column, and a retaining spring is sleeved and clamped in the slot. The inner diameter of the retaining spring is smaller than the outer diameter of the slot, and the outer diameter of the retaining spring is larger than the inner diameter of the planetary bearing.

[0015] Furthermore, the circlip is a shaft circlip.

[0016] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0017] 1. In this design, the small tapered bearing is positioned close to the planetary carrier, increasing the span between the large tapered bearing and the small tapered bearing. This reduces the bearing stress, allowing for the use of a smaller bearing while maintaining the same safety margin. This also reduces the output shaft diameter and lowers product costs.

[0018] 2. Compared with the existing technology, the structure of this solution reduces the number of parts such as the round nut and its washer, gear sleeve, baffle, top block, and ball top, so that the three-stage sun gear directly abuts against the end face of the output shaft, reducing procurement costs and improving production and assembly efficiency.

[0019] 3. In this solution, axial positioning is achieved by matching the internal and external threads, and circumferential positioning is achieved by matching the mounting pin hole and the positioning pin. This makes the positioning of the planetary structure more reliable, avoids the vertical floating of the three-stage planetary structure, optimizes the dimensional chain, and greatly improves the reliability of the product. Attached Figure Description

[0020] Figure 1 This is a cross-sectional structural schematic diagram of the pitch reducer structure provided according to an embodiment of the present utility model;

[0021] Figure 2 This is an exploded structural diagram of the pitch reducer structure provided according to an embodiment of the present utility model;

[0022] Figure 3 This is a structural schematic diagram of the planetary carrier provided according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of the output shaft according to an embodiment of the present utility model;

[0024] Figure 5 This is a structural schematic diagram of the connecting column provided according to an embodiment of the present utility model.

[0025] The reference numerals in the attached drawings include: output shaft 1, housing 2, planetary carrier 3, planetary gear 4, sun gear 5, connecting section one 6, connecting section two 7, external thread 8, internal thread 9, external pin hole 10, internal pin hole 11, locating pin 12, large tapered bearing 13, slot 14, small tapered bearing 15, connecting washer 16, connecting column 17, planetary bearing 18, and snap ring 19. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the following description is provided in conjunction with the appendix. Figure 1-5 The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and do not constitute a limitation thereof.

[0027] A pitch reducer structure includes an output shaft 1 and a housing 2 located outside the output shaft 1. One end of the output shaft 1 is connected to a planetary carrier 3 located inside the housing 2. The planetary carrier 3 includes multiple planetary gears 4. Multiple connecting posts 17 are provided on the planetary carrier 3 to match the multiple planetary gears 4. Planetary bearings 18 are installed inside the planetary gears 4. The planetary gears 4 are sleeved and installed on the connecting posts 17 through the planetary bearings 18. A sun gear 5 is provided between the planetary gears 4. The sun gear 5 meshes with the planetary gears 4 and abuts against the outer end face of the connecting section 6 in the output shaft 1.

[0028] One end of the output shaft 1 includes a connecting section 6 and a connecting section 7 arranged sequentially from the outside to the inside along the axial direction, such as... Figure 4 As shown in the F direction, connecting segment 6 and connecting segment 7 are stepped shaft structures. The inner diameter of connecting segment 6 and connecting segment 7 increases sequentially from the outside to the inside along the axial direction to improve the stability of the connection. Figures 2-4 As shown, the connecting section 2 7 is provided with an external thread 8, and the inner wall of the planetary carrier 3 is provided with an internal thread 9 that matches the external thread 8 on the connecting section 2 7. The connecting section 1 6 is provided with multiple external pin holes 10, and the planetary carrier 3 is provided with multiple internal pin holes 11 that match the multiple external pin holes 10. The matching internal pin holes 11 and external pin holes 10 together form a mounting pin hole. A positioning pin 12 is provided in the mounting pin hole. The positioning pin 12 is connected to the mounting pin hole by an interference fit. Specifically, the positioning pin 12 can be frozen by the principle of thermal expansion and contraction and then assembled into the mounting pin hole.

[0029] The connecting section 6 has a straight wall structure. Multiple external pin holes 10 are evenly arranged circumferentially along the outer wall of the connecting section 6, and internal pin holes 11 are evenly arranged circumferentially along the inner wall of the planetary carrier 3. The positioning pin 12 can prevent the threaded connection between the internal thread 9 and the external thread 8 from loosening. The planetary carrier 3 and the output shaft 1 are axially positioned by matching the internal thread 9 and the external thread 8, and circumferentially positioned by matching the mounting pin hole and the positioning pin 12. This avoids the three-stage planetary structure from floating up and down, optimizes the dimensional chain, and improves product reliability.

[0030] A large tapered bearing 13 is provided between the housing 2 and the output shaft 1. A small tapered bearing 15 is also provided between the housing 2 and the output shaft 1, located between the planetary carrier 3 and the large tapered bearing 13. The small tapered bearing 15 is positioned close to the planetary carrier 3, and a connecting gasket 16 abuts between the small tapered bearing 15 and the planetary carrier 3. This design eliminates the need for the round nut in the existing technology in the product structure, allowing the small tapered bearing 15 to be placed higher, thereby increasing the span between the large tapered bearing 13 and the small tapered bearing 15 and reducing the bearing load. This can reduce product costs while ensuring performance.

[0031] Planetary gear 4 is secured to connecting post 17 by snap ring 19. Snap ring 19 is a shaft snap ring. Connecting post 17 has a groove 14, which is a recessed groove. Snap ring 19 is fitted and secured within groove 14. The inner diameter of snap ring 19 is smaller than the outer diameter of groove 14, and the outer diameter of snap ring 19 is larger than the inner diameter of planetary bearing 18. Therefore, after snap ring 19 is fitted into groove 14, it will retract to secure itself to connecting post 17. At the same time, it will act on planetary bearing 18 to prevent axial movement of planetary gear 4.

[0032] During installation, after assembling the small tapered bearing 15 on the output shaft 1, assemble the connecting shim 16, then assemble the planetary carrier 3 onto the output shaft 1 via a threaded connection, and supplement it with the locating pin 12. Finally, install the planetary gear 4, which has already been fitted with the planetary bearing 18, and then use the snap ring 19 to position the planetary gear 4 on the planetary carrier 3.

[0033] Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0034] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A pitch reducer structure, comprising an output shaft and a housing located outside the output shaft, characterized in that, One end of the output shaft is connected to a planetary carrier located inside the housing. The planetary carrier includes multiple planetary gears, with a sun gear positioned between the planetary gears. One end of the output shaft includes a connecting section one and a connecting section two arranged sequentially from the outside to the inside along the axial direction. The connecting section two has an external thread, and the inner wall of the planetary carrier has an internal thread that matches the external thread on the connecting section two. The connecting section one has multiple external pin holes, and the planetary carrier has multiple internal pin holes that match the external pin holes. The matching internal and external pin holes together form a mounting pin hole, and a locating pin is provided in the mounting pin hole. The planetary carrier and the output shaft are axially positioned by the matching of the internal and external threads, and circumferentially positioned by the matching of the mounting pin hole and the locating pin. A large tapered bearing is provided between the housing and the output shaft. A small tapered bearing is also provided between the housing and the output shaft, located between the planetary carrier and the large tapered bearing. The small tapered bearing is positioned close to the planetary carrier, and a connecting gasket abuts against the small tapered bearing and the planetary carrier.

2. The pitch reducer structure according to claim 1, characterized in that, The sun gear abuts against the outer end face of the connecting section one in the output shaft.

3. The pitch reducer structure according to claim 2, characterized in that, The first connecting section has a straight wall structure, with multiple outer pin holes evenly arranged circumferentially along the outer wall of the first connecting section, and inner pin holes evenly arranged circumferentially along the inner wall of the planetary carrier.

4. The pitch reducer structure according to claim 3, characterized in that, The connecting section one and connecting section two are stepped shaft structures, with the inner diameter of connecting section one and connecting section two increasing sequentially from the outside to the inside along the axial direction.

5. The pitch reducer structure according to claim 4, characterized in that, The locating pin and the mounting pin hole are connected by an interference fit.

6. The pitch reducer structure according to claim 5, characterized in that, The planetary carrier is equipped with multiple connecting columns that match multiple planetary gears. Planetary bearings are installed inside the planetary gears. The planetary gears are mounted on the connecting columns through the planetary bearings. The planetary gears are secured to the connecting columns by snap rings.

7. The pitch reducer structure according to claim 6, characterized in that, The connecting column has a slot, and the retaining spring is sleeved and locked in the slot. The inner diameter of the retaining spring is smaller than the outer diameter of the slot, and the outer diameter of the retaining spring is larger than the inner diameter of the planetary bearing.

8. The pitch reducer structure according to claim 7, characterized in that, The retaining ring is a shaft retaining ring.

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