阅读说明：本技术 风力发电机组传动链装置 (Transmission chain device of wind generating set ) 是由 黄永平 李杨 于 2021-10-28 设计创作，主要内容包括：本发明公开了一种风力发电机组传动链装置,包括轮毂、齿轮箱及发电机,齿轮箱包括箱体、输入轴、输入齿轮副、平行级齿轮副及输出轴。输入轴可转动地安装于箱体内且与轮毂连接,输入齿轮副安装于输入轴上,平行级齿轮副安装于箱体内,并与输入齿轮副传动连接,平行齿轮副用于增速主轴转速,输出轴与发电机连接。上述风力发电机组传动链装置,取消了单独的主轴部件,主轴功能融合于齿轮箱,由齿轮箱输入轴、输入轴支撑轴承、齿轮箱箱体承担主轴、主轴轴承、轴承座功能,既大大简化了传动链结构,提高了传动链可靠性,也大幅度降低了成本。(The invention discloses a transmission chain device of a wind generating set, which comprises a hub, a gear box and a generator, wherein the gear box comprises a box body, an input shaft, an input gear pair, a parallel-stage gear pair and an output shaft. The input shaft is rotatably arranged in the box body and connected with the hub, the input gear pair is arranged on the input shaft, the parallel gear pair is arranged in the box body and is in transmission connection with the input gear pair, the parallel gear pair is used for increasing the rotating speed of the main shaft, and the output shaft is connected with the generator. According to the transmission chain device of the wind generating set, an independent main shaft component is omitted, the main shaft function is integrated with the gear box, and the functions of the main shaft, the main shaft bearing and the bearing seat are borne by the input shaft of the gear box, the input shaft supporting bearing and the gear box body, so that the structure of the transmission chain is greatly simplified, the reliability of the transmission chain is improved, and the cost is greatly reduced.)

1. The utility model provides a wind generating set driving chain device which characterized in that, includes wheel hub, gear box and generator, the gear box includes:

the box body is used for being arranged on the rack;

the input shaft is rotatably arranged in the box body, extends out of the box body and is connected with the hub;

the input gear pair comprises a first driving wheel and a first driven wheel, the first driving wheel is arranged on the input shaft, the first driven wheel is arranged in the box body, the first driven wheels are distributed around the first driving wheel and are meshed with the first driving wheel, and the first driving wheel and the first driven wheel are helical gears;

the parallel gear pair is arranged in the box body and is in transmission connection with the first driven wheel, and the parallel gear pair is used for realizing speed-up transmission;

and the output shaft is arranged in the box body, is in transmission connection with the parallel gear pair, and extends out of the box body to be connected with a generator.

2. The wind generating set drive chain apparatus of claim 1, wherein the input shaft has support bearings mounted thereon at spaced intervals, the support bearings being mounted within the housing.

3. The wind generating set drive chain apparatus of claim 1, wherein the input gear pair further comprises a first parallel shaft rotatably mounted within the housing, the first driven gear is mounted to one end of the first parallel shaft, and the other end of the first parallel shaft is connected to the parallel stage gear pair.

4. The wind generating set drive chain apparatus of claim 3, wherein the first parallel shaft is provided with a first bearing, the first bearing is mounted on the housing, and the first bearing on the side of the first driven wheel away from the input shaft is a thrust bearing.

5. The wind turbine generator set drive train arrangement according to claim 3, wherein the parallel stage gear pair has multiple stages, the parallel stage gear pair gradually reducing the number of split flows in the transmission path by power confluence.

6. The wind generating set transmission chain device according to claim 5, wherein the parallel stage gear pair includes a second driving wheel, a second driven wheel, a second parallel shaft, a third driving wheel and a third driven wheel, the second driving wheel is mounted at the other end of the first parallel shaft, the second parallel shaft is rotatably mounted in the box body, the second driven wheel is mounted at one end of the second parallel shaft, the second driven wheel is engaged with at least one of the second driving wheels, the third driving wheel is mounted at the other end of the second parallel shaft, the third driven wheel is mounted on the output shaft, and the third driven wheel is engaged with a plurality of the third driving wheels.

7. The wind turbine transmission chain assembly of claim 6, wherein the first driven pulley is integrally formed on the first parallel shaft and the second driven pulley is integrally formed on the second parallel shaft.

8. The wind turbine transmission chain assembly of claim 6, wherein the number of secondary drive wheels is a multiple of the number of secondary driven wheels located within the area defined by the secondary drive wheels, each secondary driven wheel engaging a plurality of secondary drive wheels.

9. The wind turbine transmission chain arrangement of claim 8, wherein the number of secondary drive wheels is twice the number of secondary driven wheels, each secondary driven wheel engaging two adjacent secondary drive wheels.

10. The wind generating set drive chain apparatus of claim 6, wherein the third driven wheel is integrally formed on a connecting shaft, and the connecting shaft is flexibly connected to the output shaft.

Technical Field

The invention relates to the technical field of wind power generation, in particular to a transmission chain device of a wind generating set.

Background

With the price balance of the wind power market, manufacturers of wind power generation sets are required to continuously reduce the manufacturing cost of the whole machine and put higher requirements on the performance of the set. In the unit construction, the cost and performance of the drive chain directly determine the cost and performance of the unit.

At present, a transmission chain in a traditional wind turbine generator set comprises parts such as a hub, a main shaft bearing, a bearing seat, a gear box, a generator, a coupler and the like, and the main shaft, the main shaft bearing and the bearing seat jointly form a main shaft part. The wind wheel hub is directly arranged at one end of the main shaft, and the main shaft is provided with one group or two groups of bearings for supporting and is connected with the frame through a bearing seat. The other end of the main shaft is connected with the input end of a gear box through an input coupler, the gear box is usually of a multi-stage planetary speed-increasing structure, and the output shaft of the gear box is connected with a generator through an output coupler.

When the wind turbine generator works, various loads such as wind wheel thrust, gravity, transverse load, torque and the like transmitted from the hub end are transmitted to the main shaft and act on a main shaft component, and the main shaft transmits the wind wheel thrust, the gravity and the transverse load to the rack through the main shaft bearing and the bearing seat and transmits the torque to the gear box. The gear box increases the low rotating speed and large torque transmitted by the main shaft to high speed and small torque and then transmits the torque to the generator so as to meet the working requirement of the generator.

However, the existing wind generating set transmission chain has the following disadvantages: 1. the existing independent main shaft component, the thrust, gravity, transverse load and torque of the wind wheel from the hub must be transmitted to the frame and the gear box through the main shaft component, so that the unit structure is complex and the installation and debugging are difficult; 2. the main shaft, the main shaft bearing and the bearing seat which form the main shaft component need to bear all loads transmitted by the hub end, so the size and the weight are larger, and the weight and the cost of the unit are increased; 3. in order to accommodate and mount the spindle part, the axial size of the frame needs to be increased, and the weight and the cost of the unit are increased; 4. the main shaft bearing needs to bear all thrust and gravity of the wind wheel, balance transverse load, and is complex in stress, large in bearing size, difficult to install and adjust, high in price and easy to damage.

Disclosure of Invention

Based on this, it is necessary to provide a transmission chain device of a wind turbine generator system aiming at the problems of long size, large number of parts, heavy weight, difficult installation and debugging and high cost of the existing transmission chain of the wind turbine generator system.

A wind generating set driving chain device comprises a hub, a gear box and a generator, wherein the gear box comprises:

the box body is used for being arranged on the rack;

the input shaft is rotatably arranged in the box body, extends out of the box body and is connected with the hub;

the input gear pair comprises a first driving wheel and a first driven wheel, the first driving wheel is arranged on the input shaft, the first driven wheel is arranged in the box body, the first driven wheels are distributed around the first driving wheel and are meshed with the first driving wheel, and the first driving wheel and the first driven wheel are helical gears;

the parallel gear pair is arranged in the box body and is in transmission connection with the first driven wheel, and the parallel gear pair is used for realizing speed-increasing transmission;

and the output shaft is arranged in the box body, is in transmission connection with the parallel gear pair, and extends out of the box body to be connected with the generator.

In one embodiment, the input shaft is provided with support bearings at intervals, and the support bearings are arranged in the box body.

In one embodiment, the input gear pair further comprises a first parallel shaft rotatably mounted in the casing, the first driven wheel is mounted at one end of the first parallel shaft, and the other end of the first parallel shaft is connected with the parallel-stage gear pair.

In one embodiment, a first bearing is arranged on the first parallel shaft, the first bearing is mounted on the box body, and the first bearing on the side, away from the input shaft, of the first driven wheel is a thrust bearing.

In one embodiment, the parallel stage gear pair has a plurality of stages, and the number of split flows is gradually reduced in the transmission path by the power confluence.

In one embodiment, the parallel-stage gear pair includes a second driving wheel, a second driven wheel, a second parallel shaft, a third driving wheel and a third driven wheel, the second driving wheel is mounted at the other end of the first parallel shaft, the second parallel shaft is rotatably mounted in the box, the second driven wheel is mounted at one end of the second parallel shaft, the second driven wheel is engaged with at least one of the second driving wheels, the third driving wheel is mounted at the other end of the second parallel shaft, the third driven wheel is mounted on the output shaft, and the third driven wheel is engaged with a plurality of the third driving wheels.

In one embodiment, the first driven wheel is integrally formed on the first parallel shaft, and the second driven wheel is integrally formed on the second parallel shaft.

In one embodiment, the number of the second driving wheels is a multiple of the number of the second driven wheels, the second driven wheels are located in the area enclosed by the second driving wheels, and each second driven wheel is meshed with a plurality of second driving wheels.

In one embodiment, the number of the second driving wheels is twice that of the second driven wheels, and each second driven wheel is meshed with two adjacent second driving wheels.

In one embodiment, the third driven wheel is integrally formed on a connecting shaft, and the connecting shaft is flexibly connected with the output shaft.

The transmission chain device of the wind generating set at least has the following advantages:

1. the single main shaft component including the main shaft, the main shaft support bearing and the bearing seat structure is eliminated, the structure of the transmission chain is greatly simplified, the cost is greatly reduced, the installation and the debugging of the transmission chain are simplified, and the reliability of the transmission chain is improved.

2. An input coupling is omitted, and the hub is directly and rigidly connected with the input shaft of the gear box, so that the structure of the transmission chain is simplified, the cost is reduced, and the installation of the transmission chain is simplified.

3. The main shaft part and the input coupling are eliminated, so that the length of the transmission chain is greatly shortened, the length of the rack is correspondingly greatly shortened, the weight is greatly reduced, the structural design difficulty of the rack is also simplified, the lightweight design of the rack is facilitated, and the cost of the rack is reduced.

4. Because the main shaft part and the input coupler are eliminated, and the light-weight design of the frame is adopted, the weight of the unit is greatly reduced, the hoisting requirement of the whole machine is reduced, and the hoisting cost is reduced.

5. The gear box adopts a multi-split parallel transmission structure to accelerate speed, the meshing axial force of the input gear pair can generate a good offsetting effect on the thrust of the wind wheel, and the load of an input shaft supporting bearing which bears the function of a main shaft supporting bearing is greatly reduced. Therefore, the model selection difficulty and the installation and debugging requirements of the input shaft support bearing are reduced; the reliability of the transmission chain is further improved, and the cost of the transmission chain is reduced.

6. The gear box adopts the design of the multi-shunt parallel transmission structure, a plurality of first driven wheels are distributed around the input shaft which undertakes the function of the main shaft, and the plurality of first driven wheels can evenly shunt the meshing axial force of the input gear pair into a plurality of stress points, so that the stress of a single position is reduced, and the stress of the single position is evenly acted on the outer side of the box body. Thereby improved the box atress, reduced the degree of difficulty of box structural design, do benefit to lightweight box design, reduce cost.

7. Because the length of the transmission chain of the unit is greatly shortened, the dynamic characteristic of the transmission chain is obviously improved, the reduction of the system resonance frequency is inhibited, the risk that the resonance frequency falls into a working interval is reduced, the unit design difficulty is reduced, and the unit reliability is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention, the drawings, which are required to be used in the embodiments, will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

FIG. 1 is a schematic diagram of a wind turbine generator set drive train arrangement according to one embodiment;

FIG. 2 is a cross-sectional view of the gearbox of FIG. 1;

FIG. 3 is a cross-sectional view of the gear box of FIG. 1 from another perspective;

FIG. 4 is a front view of the gearbox of FIG. 1;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 4;

fig. 7 is a cross-sectional view taken along line C-C of fig. 4.

Reference numerals:

10-wheel hub, 20-gear box, 21-box, 22-input shaft, 221-support bearing, 23-input gear pair, 231-first driving wheel, 232-first driven wheel, 233-first parallel shaft, 234-first bearing, 24-parallel stage gear pair, 241-second driving wheel, 242-second driven wheel, 243-second parallel shaft, 244-third driving wheel, 245-third driven wheel, 25-output shaft, 26-connecting shaft, 30-generator and 40-frame.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1, a transmission chain device of a wind turbine generator system according to an embodiment includes a hub 10, a gearbox 20, and a generator 30, and compared to a conventional transmission chain of a wind turbine generator system, the transmission chain device of a wind turbine generator system reduces spindle components including a spindle, a spindle bearing, and a bearing seat, and also has no input coupling component. The hub 10 is used for connecting a wind wheel, the hub 10 is connected with the gearbox 20, and the gearbox 20 accelerates the low-rotation-speed large torque transmitted by the hub 10 to a high-speed small torque and then transmits the high-speed small torque to the generator 30.

Referring to fig. 2 and 3, in one embodiment, the gearbox 20 includes a box 21, an input shaft 22, an input gear pair 23, a parallel stage gear pair 24, and an output shaft 25. The input shaft 22 is rotatably mounted in the case 21, and the input shaft 22 extends out of the case 21 and is connected to the hub 10. Specifically, one end of the input shaft 22 is rigidly connected to the hub 10 through a bolt, the support bearings 221 are mounted on the input shaft 22 at intervals, and the support bearings 221 are mounted on the box 21, so that the input shaft 22 can be rotatably mounted in the box 21.

The input gear pair 23 includes a first driving wheel 231 and a first driven wheel 232, the first driving wheel 231 is located in the box 21, the first driving wheel 231 is installed in the middle of the input shaft 22, the first driven wheel 232 is installed in the box 21, the plurality of first driven wheels 232 are distributed around the first driving wheel 231 and are engaged with the first driving wheel 231, and the first driving wheel 231 and the first driven wheels 232 are all bevel gears.

Referring also to fig. 5, in one embodiment, the number of the first driven wheels 232 is at least two, and preferably an even number. Specifically, in the present embodiment, the number of the first driven wheels 232 is 8. The first driven wheels 232 may be evenly distributed around the input shaft 22 or unevenly distributed, as desired. In this embodiment, the first driven wheels 232 are uniformly distributed around the input shaft 22, so as to ensure uniform stress on the first driving wheels 231.

In one embodiment, the input gear pair 23 further includes a first parallel shaft 233, the first parallel shaft 233 is rotatably installed in the casing 21, the first driven pulley 232 is installed at one end of the first parallel shaft 233, and the other end of the first parallel shaft 233 is used for connecting the parallel-stage gear pair 24.

On the basis of the above embodiment, further, the first parallel shafts 233 are parallel to the input shaft 22, the number of the first parallel shafts 233 is the same as the number of the first driven wheels 232, a plurality of the first parallel shafts 233 are distributed around the input shaft 22, and one first driven wheel 232 is mounted on each first parallel shaft 233. The first parallel shaft 233 is provided with a first bearing 234, and the first bearing 234 is mounted on the case 21, so that the first parallel shaft 233 is rotatably mounted in the case 21. The opposite sides of the first driving wheel 231 are both provided with first bearings 234, and the first bearing 234 on the side of the first driven wheel 232 far away from the input shaft 22 is thrust bearing to bear the axial thrust of the first driven wheel 232 and transmit the axial thrust to the box body 21.

Wherein, the load that the wind wheel produced all acts on wheel hub 10, because wheel hub 10 is directly connected with the input shaft 22 rigid of gear box 20, wind wheel thrust, gravity, moment of torsion, the horizontal load from wheel hub 10 are all transmitted to input shaft 22. The input shaft 22 transmits the torque to the first driving wheel 231 installed at the middle portion thereof, and the first driving wheel 231 is simultaneously engaged with the plurality of first driven wheels 232, thereby achieving power split transmission and speed increase transmission.

Because the input gear pair 23 adopts the helical gear design, axial forces with the same magnitude and opposite directions are generated on the first driving wheel 231 and the first driven wheel 232 during meshing, and by selecting a proper helical angle, most or all of the axial forces on the first driving wheel 231 and the wind wheel thrust transmitted by the input shaft 22 can be offset, so that the load borne by the support bearing 221 is greatly reduced. The weight of hub 10, the lateral loads and a small part of the remaining rotor thrust are transmitted to casing 21 via support bearings 221 at both ends of input shaft 22 and further to frame 40. The axial force borne by the first driven wheel 232 is transmitted to the thrust bearings, and since the first driven wheel 232 is in multi-split transmission and the number of the thrust bearings is correspondingly multiple, each thrust bearing only bears part of the axial force, and the axial force is transmitted to the box body 21 after being dispersedly borne by the thrust bearing and is transmitted to the frame 40 through the box body 21.

The parallel gear pair 24 is installed in the box body 21 and is in transmission connection with the first driven wheel 232, the output shaft 25 is installed in the box body 21, the output shaft 25 is in transmission connection with the parallel gear pair 24, the output shaft 25 extends out of the box body 21 and is connected with the generator 30, and the parallel gear pair 24 is used for achieving speed-increasing transmission and improving the rotating speed of the output shaft 25. The parallel gear pair 24 may be composed of a first gear pair or a multi-gear pair as required, and the parallel gear pair 24 is connected to the output shaft 25 after the final gear pair is joined.

In one embodiment, the parallel-stage gear pair 24 has a plurality of stages, the parallel-stage gear pair 24 is connected to the other end of the first parallel shaft 233, and the parallel-stage gear pair 24 gradually reduces the split amount by power confluence in the transmission path. In the present embodiment, the parallel-stage gear pair 24 has two stages. It is understood that in other embodiments, the number of the parallel gear pairs 24 may be specifically selected according to the requirement of speed increase.

Specifically, the parallel-stage gear pair 24 includes a second driving wheel 241, a second driven wheel 242, a second parallel shaft 243, a third driving wheel 244 and a third driven wheel 245. The second driving pulley 241 is mounted to the other end of the first parallel shaft 233, and the first driven pulley 232 and the second driving pulley 241 are respectively located at both ends of the first parallel shaft 233. The second parallel shaft 243 is rotatably installed in the case 21, the second driven pulley 242 is installed at one end of the second parallel shaft 243, the second driven pulley 242 is engaged with at least one second driving pulley 241, the third driving pulley 244 is installed at the other end of the second parallel shaft 243, the third driven pulley 245 is installed on the output shaft 25, and the third driven pulley 245 is simultaneously engaged with the plurality of third driving pulleys 244.

The process of increasing the speed of the low-speed large torque to the high-speed small torque by the gearbox 20 is specifically as follows: the first driving wheel 231 drives the first driven wheel 232 to rotate, and since the first driving wheel 231 is meshed with the plurality of first driven wheels 232, the first driven wheels 232 can be accelerated, so that the first-time acceleration transmission is realized.

The first parallel shaft 233 then transmits torque to the second drive wheel 241, and the second drive wheel 241 drives the second driven wheel 242 in rotation. Since each secondary driven pulley 242 engages a plurality of secondary drive pulleys 241, a secondary speed increasing transmission can be realized.

Finally, the second parallel shaft 243 transfers the torque to the third driving wheel 244, and the third driving wheel 244 drives the third driven wheel 245, and thus the output shaft 25. A third step-up drive is achieved because the third driven pulley 245 engages the plurality of third drive pulleys 244. The gear box 20 realizes the speed increase from low rotating speed and large torque to high speed and small torque through three times of speed increasing transmission.

Referring to fig. 3 and 6, in addition to the above embodiment, the number of the second driving wheels 241 is the same as the number of the first driven wheels 232, and each second driving wheel 241 is installed on the corresponding first parallel shaft 233. In this embodiment, the number of the second driving wheels 241 is 8. The number of the second driving wheels 241 is a multiple of the number of the second driven wheels 242, the second driven wheels 242 are located within a circumferential range surrounded by the second driving wheels 241, so that the second driven wheels 242 are conveniently meshed with the second driving wheels 241, and each second driven wheel 242 is meshed with a plurality of second driving wheels 241, thereby realizing speed-increasing transmission.

Specifically, in the present embodiment, the number of the second driving wheels 241 is twice as many as the number of the second driven wheels 242, that is, the number of the second driven wheels 242 is 4, and each of the second driven wheels 242 engages with two adjacent second driving wheels 241. It is understood that in other embodiments, the number of the second driving wheels 241 may be 1 times the number of the second driven wheels 242, the second driven wheels 242 are engaged with the second driving wheels 241 individually, or the number of the second driving wheels 241 and the number of the second driven wheels 242 are 1 times, 2 times or 3 times respectively according to different circumferential distribution positions, as long as each second driven wheel 242 can be normally engaged with the second driving wheel 241.

Referring also to fig. 7, in one embodiment, the second parallel shafts 243 are rotatably mounted in the housing 21 by bearings, the number of the second parallel shafts 243 is the same as that of the second driven pulleys 242, and one second driven pulley 242 is mounted on each second parallel shaft 243. The second parallel axis 243 is parallel to the first parallel axis 233, and the second parallel axis 243 is located between the first parallel axis 233 and the input shaft 22. The number of the third driving wheels 244 is the same as that of the second parallel shafts 243, and the second driven wheels 242 and the third driving wheels 244 are respectively installed at two ends of the second parallel shafts 243. In the present embodiment, the number of the third driving pulleys 244 is 4.

In one embodiment, the first driven wheel 232 is integrally formed on the first parallel shaft 233, the second driven wheel 242 is integrally formed on the second parallel shaft 243, and the first parallel shaft 233 and the second parallel shaft 243 are both gear shafts, so that the installation process is simple and the structure is compact. The third driving pulley 244 surrounds the third driven pulley 245, and a plurality of the third driving pulleys 244 are engaged with the third driven pulley 245. In the present embodiment, 4 third driving wheels 244 are engaged with the third driven wheels 245. The third driven wheel 245 is integrally formed on the connecting shaft 26, the connecting shaft 26 is a gear shaft, and the connecting shaft 26 is flexibly connected with the output shaft 25.

In one embodiment, generator 30 is directly mounted to case 21 by bolts, and output shaft 25 is shared with the rotor shaft of generator 30 to drive generator 30 to generate electricity. The generator 30 does not need an end cover, so that the structure of the transmission chain device can be simplified, and the volume of the transmission chain device can be reduced. Of course, in other embodiments, the generator 30 may be directly mounted to the frame 40, and the rotor of the generator 30 may be coupled to the output shaft 25.

According to the transmission chain device of the wind generating set, the functions of the main shaft component of the transmission chain of the wind generating set can be integrated in the structural design of the gear box 20, so that a brand new transmission chain structure of the wind generating set is formed. In this drive train, there is no separate main shaft component, and the input shaft 22 of the gear box 20 functions as the original main shaft, the support bearing 221 of the input shaft 22 of the gear box 20 functions as a main shaft bearing, and the housing 21 of the gear box 20 functions as a main shaft bearing seat. And the gearbox 20 adopts the multi-split parallel transmission technology, the power branches are distributed around the input shaft 22, the radial space is fully utilized, the input shaft 22 integrates the main shaft function, and the first driving wheel 231 is arranged in the middle of the input shaft 22, so that the input shaft 22 simultaneously bears the thrust of the wind wheel and the meshing axial force of the gears, and the mutual counteraction effect is realized. The multi-split structure simultaneously disperses the meshing axial force borne by the gearbox 20 according to the split quantity and then transmits the force to the box body 21, so that the load deformation of the box body 21 is reduced.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.