Light-weight yaw speed reducer planetary gear train

Abstract

The utility model discloses a lightweight yaw speed reducer planetary gear train, and belongs to the technical field of wind power equipment. The yaw speed reducer solves the problems that an existing yaw speed reducer is large in overall size and heavy in weight. The first-stage sun gear and the second-stage sun gear are oppositely arranged up and down along the same axis, the gear ring and the first-stage sun gear are coaxially arranged, a plurality of planet gears are meshed between the first-stage sun gear and the gear ring, a wheel shaft is inserted in each planet gear, a plurality of cylindrical rolling bodies are arranged between the planet gears and the wheel shafts, and the cylindrical rolling bodies are meshed with the first-stage sun gear and the second-stage sun gear. The bottom of the wheel shaft is fixedly connected with the planet carrier, and the planet carrier is in meshing transmission with a spline on the top of the secondary sun wheel through a spline on the planet carrier. The cylindrical rolling bodies are arranged between the planet wheels and the wheel shafts to form supports, extra structural space occupation is eliminated, the structure is fundamentally simplified, the space utilization rate is greatly improved, the layout of the whole planetary gear train is more compact and firmer, and light weight of the structure is achieved.

Description

Technical Field

[0001] This utility model relates to the field of wind power equipment technology, and in particular to a lightweight yaw reducer planetary gear system. 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 rotation of the wind turbine nacelle, thus achieving wind-adjusting. Currently, most yaw reducers adopt a multi-stage planetary gear train structure in series. While this structure offers high torque transmission and reliability, it still suffers from large overall size and weight, making it difficult to fully meet the increasingly stringent requirements of wind turbines regarding installation space and operating energy consumption. Known low-tooth-difference transmission technology has been theoretically applied in yaw reducers, offering the advantage of a relatively compact structure. However, its transmission efficiency is low, and its manufacturing cost is high, hindering its widespread adoption in practical mass applications. Therefore, optimizing the traditional planetary gear train structure for lightweighting and compactness, especially addressing issues such as insufficient structural compactness and redundant strength in some components, has become an important research direction for reducing the size and weight of the planetary gear train in yaw reducers. Utility Model Content

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

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a lightweight yaw reducer planetary gear system, including a first-stage sun gear, multiple planet gears, a ring gear, a second-stage sun gear, and a planet carrier. The first-stage sun gear and the second-stage sun gear are arranged vertically opposite each other along the same axis. The ring gear is coaxially arranged with the first-stage sun gear. Multiple planet gears mesh between the first-stage sun gear and the ring gear. Each planet gear has a gear shaft inserted inside it. Multiple cylindrical rolling elements are provided between the planet gear and the gear shaft. The bottom of the gear shaft is fixedly connected to the planet carrier. The planet carrier engages with the spline on the top of the second-stage sun gear for transmission.

[0005] Furthermore, an annular groove is formed between the opposing surfaces of the planetary gear and the axle, and the plurality of cylindrical rolling elements are installed in the annular groove.

[0006] Furthermore, the bottom of the axle is provided with a shoulder, the axle is positioned by abutting against the planetary carrier through the shoulder, and the axle is fixedly connected to the planetary carrier by an elastic retaining ring.

[0007] Furthermore, a washer is provided between the planetary gear and the planet carrier.

[0008] Furthermore, a shoulder is formed on the outer periphery of the secondary sun gear, and the secondary sun gear is axially positioned with the planet carrier through the shoulder.

[0009] Furthermore, a pad is provided between the primary sun gear and the secondary sun gear.

[0010] Furthermore, the washer, the cylindrical rolling element, and the pad are all integrally hardened, and the annular groove, the bottom surface of the planetary gear, the upper and lower end faces of the first-stage sun gear, and the upper and lower end faces of the second-stage sun gear are all hardened.

[0011] Furthermore, both the first-stage sun gear and the second-stage sun gear have oil grooves on their lower end faces.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] This invention utilizes a fully loaded set of cylindrical rolling elements directly between the planetary gears and the axle to form a support. By highly integrating the support function within the planetary gear pair, additional structural space is eliminated, significantly reducing the radial dimension of the planetary gear assembly. This integrated design, while ensuring support reliability, fundamentally simplifies the structure, greatly improves space utilization, and makes the entire planetary gear system more compact and lightweight, laying a core foundation for the miniaturization of speed reducers.

[0014] This invention integrates power transmission and output by using splined engagement between the secondary sun gear and the planetary carrier, and by arranging the primary and secondary sun gears coaxially along the axis. This efficient use of axial space and reduction in the number of parts directly results in a significant reduction in overall weight. Higher power density is achieved while maintaining the same output torque. This meets the stringent requirements of wind power generation equipment for lightweight and compact drive components. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front view of the planetary gear train of the yaw reducer in this utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the primary sun gear in this utility model;

[0018] Figure 3This is a three-dimensional structural diagram of the secondary sun gear in this utility model;

[0019] In the diagram: 1. First-stage sun gear; 2. Planet gears; 3. Cylindrical rolling elements; 4. Axle; 5. Washer; 6. Gear ring; 7. Second-stage sun gear; 8. Pad; 9. Planet carrier. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; 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 utility model based on the specific circumstances.

[0022] See appendix Figure 1-3 This embodiment describes a lightweight yaw reducer planetary gear train, comprising a primary sun gear 1, multiple planet gears 2, a ring gear 6, a secondary sun gear 7, and a planet carrier 9. The primary sun gear 1 and the secondary sun gear 7 are arranged vertically opposite each other along the same axis. The ring gear 6 is coaxially arranged with the primary sun gear 1. Multiple planet gears 2 mesh between the primary sun gear 1 and the ring gear 6. Each planet gear 2 has a shaft 4 inserted inside it. Multiple cylindrical rolling elements 3 are provided between the planet gear 2 and the shaft 4. The bottom of the shaft 4 is fixedly connected to the planet carrier 9. The planet carrier 9 engages with the spline on the top of the secondary sun gear 7 via splines on its surface for transmission. Specifically, both the primary sun gear 1 and the secondary sun gear 7 have hollow internal structures. The hollow structure reduces the overall weight, achieving a lightweight structure.

[0023] A support system is formed by directly mounting fully loaded cylindrical rolling elements 3 between planetary gears 2 and the axle 4. This highly integrated support function within the planetary gear set eliminates additional structural space requirements, significantly reducing the radial dimension of the planetary gear assembly. This integrated design, while ensuring support reliability, fundamentally simplifies the structure, greatly improves space utilization, and makes the entire planetary gear system more compact and lightweight, laying a core foundation for gearbox miniaturization. By using spline meshing between the second-stage sun gear 7 and the planet carrier 9, and arranging the first and second-stage sun gears 7 coaxially along the axis, power transmission and output are highly integrated. The efficient use of axial space and the reduction in the number of parts directly result in a significant reduction in overall weight. Higher power density is achieved while maintaining the same output torque. This meets the stringent requirements of wind power generation equipment for lightweight and compact drive components.

[0024] The planetary gear 2 and the axle 4 have annular grooves formed on their opposing surfaces, and the plurality of cylindrical rolling elements 3 are installed within the annular grooves. Specifically, the top and bottom surfaces inside the annular grooves provide axial positioning for the cylindrical rolling elements 3. By integrating annular grooves between the planetary gear 2 and the axle 4, and installing cylindrical rolling elements 3 within the annular grooves, independent bearings are replaced, resulting in a more compact support structure, reduced friction loss, and improved load-bearing capacity and transmission efficiency.

[0025] The bottom of the axle 4 is provided with a shoulder, which abuts against and positions the axle 4 against the planetary carrier 9. The axle 4 is fixedly connected to the planetary carrier 9 by an elastic retaining ring. The shoulder enables precise positioning of the axle 4 and the planetary carrier 9, and the elastic retaining ring ensures reliable fixation. This simplifies the installation process, improves assembly efficiency and axial positioning accuracy, and enhances the stability of the overall structure.

[0026] A washer 5 is provided between the planetary gear 2 and the planet carrier 9. Specifically, the washer 5 is used to limit the axial movement of the planetary gear 2 and the planet carrier 9.

[0027] The secondary sun gear 7 has a shoulder formed on its outer periphery, and the secondary sun gear 7 is axially positioned with the planet carrier 9 through the shoulder.

[0028] A pad 8 is provided between the first-stage sun gear 1 and the second-stage sun gear 7. The structure of the pad 8 can accurately set and maintain the axial position between the sun gear and the planet carrier 9, occupying little space and having high reliability. It effectively controls the critical meshing clearance, thereby reducing transmission noise and vibration, and significantly improving the assembly consistency, running stability and structural rigidity of the planet gear 2 system.

[0029] The washer 5, the cylindrical rolling element 3, and the pad 8 are all integrally hardened. The annular groove, the bottom surface of the planetary gear 2, the upper and lower end faces of the first-stage sun gear 1, and the upper and lower end faces of the second-stage sun gear 7 are also hardened. This hardening treatment significantly improves the hardness and wear resistance of key friction pairs and contact surfaces, effectively reducing operational wear, ensuring transmission accuracy and operational stability under long-term heavy-load conditions, and greatly extending the service life of core components.

[0030] Both the primary sun gear 1 and the secondary sun gear 7 have oil grooves on their lower end faces. The oil groove structure can effectively store and guide lubricating oil, significantly improving the lubrication conditions between the sun gear end face and adjacent components, thereby reducing friction and wear and temperature rise, improving transmission efficiency, and extending the service life of key gear pairs.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model 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 utility model.

Claims

1. A lightweight yaw reducer planetary gear train, characterized in that: It includes a primary sun gear (1), multiple planet gears (2), a gear ring (6), a secondary sun gear (7), and a planet carrier (9). The primary sun gear (1) and the secondary sun gear (7) are arranged vertically opposite each other along the same axis. The gear ring (6) is coaxially arranged with the primary sun gear (1). Multiple planet gears (2) mesh between the primary sun gear (1) and the gear ring (6). Each planet gear (2) has a wheel axle (4) inserted inside it. Multiple cylindrical rolling elements (3) are provided between the planet gear (2) and the wheel axle (4). The bottom of the wheel axle (4) is fixedly connected to the planet carrier (9). The planet carrier (9) is driven by the spline on it meshing with the spline on the top of the secondary sun gear (7).

2. The lightweight yaw reducer planetary gear train according to claim 1, characterized in that: An annular groove is formed between the opposing surfaces of the planetary gear (2) and the axle (4), and the plurality of cylindrical rolling elements (3) are installed in the annular groove.

3. The lightweight yaw reducer planetary gear train according to claim 1, characterized in that: The bottom of the axle (4) is provided with a shoulder, and the axle (4) is positioned by abutting against the planetary carrier (9) through the shoulder. The axle (4) is fixedly connected to the planetary carrier (9) by an elastic retaining ring.

4. The lightweight yaw reducer planetary gear train according to claim 2, characterized in that: A washer (5) is provided between the planetary gear (2) and the planet carrier (9).

5. The lightweight yaw reducer planetary gear train according to claim 1, characterized in that: The secondary sun gear (7) has a shoulder formed on its outer periphery, and the secondary sun gear (7) is axially positioned with the planet carrier (9) through the shoulder.

6. The lightweight yaw reducer planetary gear train according to claim 4, characterized in that: A pad (8) is provided between the first-stage sun gear (1) and the second-stage sun gear (7).

7. The lightweight yaw reducer planetary gear train according to claim 6, characterized in that: The washer (5), the cylindrical rolling element (3) and the pad (8) are all subjected to overall hardening treatment. The annular groove, the bottom surface of the planetary gear (2), the upper and lower end surfaces of the first-stage sun gear (1) and the upper and lower end surfaces of the second-stage sun gear (7) are all subjected to hardening treatment.

8. The lightweight yaw reducer planetary gear train according to claim 1, characterized in that: The lower end faces of the first-stage sun gear (1) and the second-stage sun gear (7) are both provided with oil grooves.

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