CN111536203A - A compact hybrid drive wind turbine gearbox transmission structure - Google Patents

Abstract

The invention discloses a compact hybrid driving wind generating set gear box transmission structure, which comprises a first-stage planetary gear transmission system, a second-stage planetary gear transmission system and a third-stage planetary gear transmission system; the first stage transmission system is in fixed shaft inner gearing transmission, power is input by an inner gear ring of the first stage transmission system and is output by a plurality of outer gears in an evenly distributed manner; the second stage transmission system is fixed shaft external meshing transmission, and power is input by a plurality of large gears and converged to a central small gear to be output; the third-stage planetary gear transmission system is an NGW planetary gear transmission system, a planet carrier of the third-stage planetary gear transmission system is connected with a central pinion through a spline pair, and a sun gear of the third-stage planetary gear transmission system is connected with a generator. The invention fully utilizes the radial space of the original second-stage planetary transmission of the traditional compact hybrid wind generating set gear box, keeps the space of the gear box unchanged, can improve the wind power generation power and the gear box speed ratio, and provides a solution for a compact hybrid driving wind power generation transmission structure.

Description

A compact hybrid drive wind turbine gearbox transmission structure

technical field

The invention relates to the technical field of wind power generation gearbox transmission, in particular to a compact hybrid drive wind turbine gearbox transmission structure.

Background technique

Figure 1 is a schematic structural diagram of a conventional compact hybrid wind turbine gearbox. A total of two-stage NGW type planetary gear transmission system is composed, and the total speed ratio is between 22-25. The first-stage planetary gear transmission system 03 has a transmission ratio of about 4.5; the second-stage gear planetary transmission system 09 has a transmission ratio of about 5.5; the hub 04 is connected to the planet carrier 05 of the first-stage planetary gear transmission system and the inner ring of the main shaft bearing 06 together; the outer ring of the main shaft bearing 06 is connected with the box 07 and the generator casing 08 to form the outermost structure of the wind turbine, replacing the nacelle of the traditional structure; the planet carrier 010 of the second stage planetary gear transmission system and the first stage The sun gear 01 of the planetary gear transmission system is connected by the spline 02, the power from the blades is transmitted to the inside of the gearbox through the hub 04, and finally the sun gear 011 of the second-stage planetary gear transmission system is output to the generator;

On the existing platform, without changing the space size of the transmission device, the main bearing model, and the transmission power, the speed ratio of the gearbox should be increased to within 60-100, so that the generator can run at medium and high speed. Without changing the existing structure of the gearbox, only the radial space of the second-stage planetary gear can be used, but the total speed ratio can only be increased to 32. The axial size of the gearbox limits the increase of the speed ratio of the gearbox.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art. Aiming at the problem that the increase of the speed ratio of the gearbox of the traditional compact hybrid wind turbine is limited, a transmission structure of the gearbox of the compact hybrid drive wind turbine is proposed, which is similar to the traditional NGW planetary transmission gear. Compared with the gearbox, one more stage of planetary transmission is added to form a total of 3 stages of planetary gear transmission. On the premise of keeping the space unchanged, the wind power generation power and gearbox speed ratio can be improved, providing a compact hybrid drive wind power transmission structure. solution, and the wind turbine power can be applied between 2.5MW and 15MW.

In order to achieve the above purpose, the technical solution provided by the present invention is: a compact hybrid drive wind turbine gearbox transmission structure, including a first-stage planetary gear transmission system, a second-stage planetary gear transmission system and a third-stage planetary gear transmission system; the first-stage planetary gear transmission system is a fixed-shaft internal meshing transmission system, the power is input from its inner gear ring, and then forms multiple branch outputs through its multiple external gears, and the multiple external gears form the inner ring gear. The inner gear is evenly distributed, and meshes with the inner gear respectively to distribute the power evenly. The inner gear is fixedly connected with the hub of the wind turbine, and one of the outer gears is installed on the cantilever end of a transmission shaft. The transmission shaft is respectively The first bearing and the second bearing are supported on the gear box body and the bearing seat plate, and the bearing seat plate and the gear box body are fixed as a whole; the second-stage planetary gear transmission system is a fixed-shaft external meshing transmission system, The power output by the first-stage planetary gear transmission system is input by a plurality of large gears of the second-stage planetary gear transmission system, which converge to the output of its central pinion. The plurality of large gears are evenly meshed around the central pinion, and one of the large gears is installed. On the transmission shaft, it shares the same transmission shaft with the external gear of the first-stage planetary gear transmission system, and is located between the first bearing and the second bearing; the third-stage planetary gear transmission system is an NGW planetary transmission system, which is The planet carrier is connected with the central pinion of the second-stage planetary gear transmission system through the spline pair, and its sun gear is connected with the generator of the wind turbine, so that the output power of the second-stage planetary gear transmission system is finally driven by the third-stage planetary gear. The sun gear of the drive train is output to the generator.

Further, the central pinion of the second-stage planetary gear transmission system and the sun gear of the third-stage planetary gear transmission system are both floating parts.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. The two-stage NGW type planetary gear transmission system of the traditional compact hybrid wind turbine gearbox, its original first-stage NGW planetary transmission: it is divided into the internal meshing of the planetary gear and the ring gear and the external meshing of the planetary gear and the sun gear. In the principle of NGW transmission, the load-carrying capacity of internal meshing is about 2.3 times that of external meshing (based on the commonly used speed ratio and considering the influence of different materials of commonly used internal and external meshing gears), and the external meshing sun gear and the external meshing planetary The bearing capacity of the wheel is the weak link of the planetary transmission (especially the external meshing sun gear), and at the same time, due to the bidirectional meshing of the planetary gear teeth, the bending bearing capacity of the planetary gear is reduced by 30%.

Based on this, the present invention removes the sun gear from the first-stage planetary transmission, and fixes the planetary carrier. At this time, the planetary transmission is changed to the internal meshing of the fixed-axis transmission, and the planetary gear becomes one-way meshing, and then the ring gear is connected to the hub. The connection becomes the input piece, the planetary gear becomes the output external gear, and the multiple output external gears divide the power of the ring gear. Such a change comprehensively enhances the bearing capacity of the gear transmission, which can reduce the number of teeth and the width of the output external gear on the premise of satisfying the strength of the gear, and save the axial space for increasing the transmission ratio.

2. The large gear of the second-stage planetary gear transmission system of this transmission structure is on the same transmission shaft as the external gear of the first-stage planetary gear transmission system, and meshes with the central pinion of the second-stage planetary gear transmission system to confluence the power. to the center pinion, and then output to the next stage. Since the total speed ratio of the first two-stage transmission is about 14, it is necessary to increase the NGW planetary transmission fixed by the third-stage inner gear, the maximum single-stage speed ratio is about 7, and the transmission power is input from the central pinion through the spline pair to the third-stage planetary The planet carrier of the gear transmission system is finally output to the generator by the sun gear of the third stage planetary gear transmission system. This design makes full use of the radial space of the original second-stage planetary transmission of the traditional compact hybrid wind turbine gearbox, and designs a two-stage parallel shaft transmission structure (including 1-stage internal meshing, 1-stage external meshing) and 1-stage NGW Planetary transmission achieves the purpose of increasing the total transmission ratio in the original space, and at the same time, selecting the appropriate speed ratio can also improve the transmission power to a certain extent, providing a new transmission type for the design of the transmission gearbox for wind power generation.

Description of drawings

FIG. 1 is a schematic structural diagram of a conventional compact hybrid wind turbine gearbox.

FIG. 2 is a schematic diagram of the transmission structure of the gearbox of the compact hybrid drive wind turbine according to the present invention.

FIG. 3 is a schematic diagram of the spatial arrangement of the first-stage planetary gear transmission system and the second-stage planetary gear transmission system.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments.

Referring to Figure 2, the compact hybrid drive wind turbine gearbox transmission structure provided in this embodiment includes a first-stage planetary gear transmission system, a second-stage planetary gear transmission system and a third-stage planetary gear transmission system.

The first-stage planetary gear transmission system is a fixed-shaft internal meshing transmission system. The power is input from its inner gear 1, and then forms n branch outputs through its n external gears 2, n=3, 4, 5..., The n external gears 2 are evenly distributed in the inner ring gear 1 and mesh with the inner gear 1 respectively to distribute power evenly. Mounted on the cantilever end of a drive shaft 9, the drive shaft 9 is supported on the gear case 11 and the bearing seat plate 13 through the first bearing 8 and the second bearing 12, the bearing seat plate 13 and the gear case 11 solid as a whole.

The spatial arrangement structure of the first-stage planetary gear transmission system is shown in Figure 3 (with n=3 as an example), the serial number 1 is the inner gear, and the serial numbers 2-1, 2-2, and 2-3 are three external gears. Evenly distributed in the ring gear 1, the power is evenly distributed among these 3 paths.

The second-stage planetary gear transmission system is a fixed-shaft external meshing transmission system, and the output power of the first-stage planetary gear transmission system is input by the m large gears 3 of the second-stage planetary gear transmission system, and converges to its central pinion. 4 output, the m large gears 3 mesh evenly around the central pinion 4, one of the large gears 3 is installed on the transmission shaft 9, that is, it shares the same transmission shaft with the external gear of the first-stage planetary gear transmission system, and is located in the first stage. Between a bearing 8 and a second bearing 12 .

The spatial arrangement structure of the second-stage planetary gear transmission system is shown in Figure 3 (with m=3 as an example), the serial numbers 3-1, 3-2, and 3-3 are three large gears, and the serial number 4 is the central pinion. The three large gears 3-1, 3-2, and 3-3 are evenly distributed around the central pinion 4 and mesh with the central pinion 4 respectively. The arrangement makes efficient use of radial space.

The third-stage NGW planetary transmission system 5 is an NGW planetary transmission system, and its planet carrier 14 is connected with the central pinion 4 of the second-stage planetary gear transmission system through the spline pair 7, and its sun gear 6 is directly connected to the wind turbine. The generator is connected so that the power output by the second-stage planetary gear transmission system is finally output to the generator by the sun gear 6 of the third-stage planetary gear transmission system 5 .

In addition, the gear box adopts a power split transmission structure. Due to manufacturing and assembly errors, there must be uneven power distribution in each branch, and a load-equalizing mechanism is required. Therefore, the second-stage and third-stage transmission adopts the measures of floating wheels, that is, the central pinion 4 of the second-stage planetary gear transmission system and the sun gear 6 of the third-stage planetary gear transmission system 5 are floating parts; while the external gear 2 is to reduce the stiffness and increase the flexibility to solve the load sharing, that is, the first-stage planetary gear transmission system adopts a flexible pin structure, and the specific method is that the gear assembly adopts the form of a cantilever beam. at the cantilevered end of the drive shaft 9 .

Due to the large deformation of the cantilever beam structure after being stressed, it is easy to cause the gear on it to tilt, resulting in uneven force on the width of the gear. Therefore, the gear needs to be designed into a special structure. After assembly, the cantilever beam is formed in the reverse direction of the cantilever beam. At the end, a total of 2 cantilever structures are formed, that is, the so-called flexible pin structure. Referring to FIG. 2 , the external gear 2 and the transmission shaft 9 form a flexible pin structure. When a normal force is applied to the external gear, the angular deflection caused by the bending of the transmission shaft can be offset by the angular deflection caused by the bending of the gear from the other end in the opposite direction. The normal force causes the flexible pin to tilt downward, The reverse torque causes the flexible pin to tilt upward, and the two opposite inclinations will cancel out, so that the planetary gear as a whole does not tilt, and the force is not biased, and each gear moves in parallel, so that the load is between each tooth width. equally distributed.

To sum up, the above design makes full use of the radial space of the original second-stage planetary transmission of the traditional compact hybrid wind turbine gearbox, and designs a two-stage parallel shaft transmission structure (including 1-stage internal meshing and 1-stage external meshing). ) and 1-stage NGW planetary transmission, to achieve the purpose of increasing the total transmission ratio in the original space; at the same time, selecting the appropriate speed ratio can also improve the transmission power to a certain extent, which provides a design for the transmission gearbox of wind power generation. The new transmission type is worth promoting.

The above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention. Therefore, any changes made according to the shape and principle of the present invention should be included within the protection scope of the present invention.

Claims (2)

1. A compact hybrid drive wind turbine gearbox transmission structure, comprising a first-stage planetary gear transmission system and a second-stage planetary gear transmission system, characterized in that: also comprising a third-stage planetary gear transmission system (5); The first-stage planetary gear transmission system is a fixed-shaft internal meshing transmission system, and the power is input by its inner gear (1), and then output through a plurality of external gears (2) to form a plurality of branches, and the plurality of external gears ( 2) Evenly distributed in the inner ring gear (1) and meshed with the inner gear (1) respectively to distribute power evenly, the inner gear (1) is fixedly connected with the hub (10) of the wind turbine, wherein An external gear (2) is mounted on the cantilevered end of a drive shaft (9), the drive shaft (9) is supported on the gear case body (11) and the gear case body (11) and through the first bearing (8) and the second bearing (12) respectively. On the bearing seat plate (13), the bearing seat plate (13) and the gear box body (11) are fixed as a whole; the second-stage planetary gear transmission system is a fixed-shaft external meshing transmission system, and the first-stage planetary gear The power output by the transmission system is input by a plurality of large gears (3) of the second-stage planetary gear transmission system, and converges to its central pinion (4) for output, and the plurality of large gears (3) evenly surround the central pinion (4) Meshing, one of the large gears (3) is installed on the transmission shaft (9), which shares the same transmission shaft with the external gear (2) of the first-stage planetary gear transmission system, and is located between the first bearing (8) and the second bearing. (12); the third-stage planetary gear transmission system (5) is an NGW planetary transmission system, and the planet carrier (14) is connected to the central pinion ( 4) Connection, its sun gear (6) is connected with the generator of the wind turbine, so that the power output by the second-stage planetary gear transmission system is finally output by the sun gear (6) of the third-stage planetary gear transmission system (5). on the generator. 2. A compact hybrid drive wind turbine gearbox transmission structure according to claim 1, characterized in that: the center pinion (4) of the second-stage planetary gear transmission system and the third-stage planetary gear transmission system The sun gears (6) of (5) are all floating parts.

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