CN113915319B - Speed increasing gear box of wind generating set - Google Patents
Speed increasing gear box of wind generating set Download PDFInfo
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- CN113915319B CN113915319B CN202111265997.XA CN202111265997A CN113915319B CN 113915319 B CN113915319 B CN 113915319B CN 202111265997 A CN202111265997 A CN 202111265997A CN 113915319 B CN113915319 B CN 113915319B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 47
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 8
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000005484 gravity Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/20—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members
- F16H1/206—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members characterised by the driving or driven member being composed of two or more gear wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02039—Gearboxes for particular applications
- F16H2057/02078—Gearboxes for particular applications for wind turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02086—Measures for reducing size of gearbox, e.g. for creating a more compact transmission casing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02091—Measures for reducing weight of gearbox
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02095—Measures for reducing number of parts or components
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gear Transmission (AREA)
- Wind Motors (AREA)
Abstract
The invention discloses a speed increasing gearbox of a wind generating set, which comprises a box body, an input shaft, an input gear pair, a parallel gear pair and an output shaft. The input shaft is rotatably arranged in the box body and is connected with the hub of the wind wheel. 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, a plurality of first driven wheels are distributed around the first driving wheel and meshed with the first driving wheel, and the first driving wheel and the first driven wheel are bevel gears. The parallel gear pair is arranged in the box body and is in transmission connection with the first driven wheel. The output shaft is arranged in the box body and is in transmission connection with the parallel gear pair. The wind generating set speed increasing gear box integrates the main shaft function, so that the structure of a transmission chain is greatly simplified, the cost is greatly reduced, the installation and debugging of the transmission chain are simplified, and the reliability of the transmission chain is improved.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a speed increasing gearbox of a wind generating set.
Background
With the market price of wind power reduced, wind turbine manufacturers are required to continuously reduce the manufacturing cost of the whole machine, and higher requirements are provided for the performance of the wind turbine. In the unit constitution, the cost and performance of the transmission chain directly determine the cost and performance of the unit.
At present, a transmission chain in a traditional wind turbine generator comprises a hub, a main shaft bearing, a bearing seat, a gear box, a generator, a coupler and other parts, 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 one or two groups of bearings are arranged on the main shaft for supporting and are connected with the frame through bearing seats. The other end of the main shaft is connected with the input end of a gear box through an input coupling, the gear box is usually of a multi-stage planetary speed increasing structure, and an output shaft of the gear box is connected with a generator through an output coupling.
When the wind turbine works, various loads such as wind wheel thrust, gravity, transverse load and torque transmitted from the hub end are transmitted to the main shaft and act on the main shaft component, and the main shaft transmits the wind wheel thrust, gravity and transverse load to the frame through the main shaft bearing and the bearing seat and transmits the torque to the gear box. The gearbox is used for accelerating the low-rotation-speed large torque transmitted by the main shaft to high-speed small torque and transmitting the high-speed large torque to the generator so as to meet the working requirement of the generator.
The existing gearbox of the traditional wind generating set has the following defects: 1. the gearbox cannot withstand the thrust, gravity and all lateral loads from the rotor end, and a separate main shaft component is required at its forward end to withstand these loads. Wind rotor thrust, gravity, lateral loads from the hub need to be transferred to the frame through separate main shaft components, but only torque to the gearbox. The transmission chain of the unit has the advantages of large number of parts, complex structure, difficult installation and debugging, heavy weight and high cost. 2. Because the gearbox cannot bear all loads from the wind wheel end, an independent main shaft component is required to be arranged for sharing, and an input shaft of the gearbox is rigidly connected with a main shaft through a coupler, so that the axial geometric dimension of a transmission chain is unnecessarily lengthened, the system has high flexibility, the kinetic risk of the transmission chain is easily caused, and the reliability of a unit is reduced; 3. the main shaft and the input shaft of the gearbox are connected by adopting a special coupler, and the low-speed high-torque coupler has high installation requirement and heavy weight, so that the failure risk is increased, and the cost is increased.
Disclosure of Invention
Based on the problems, the existing wind turbine generator gearbox cannot bear the load of a wind wheel, and therefore the structure is complex, the installation and debugging are difficult, the cost is high and the reliability is poor.
A wind turbine generator set step-up gearbox comprising:
a case;
the input shaft is rotatably arranged in the box body and extends out of the box body to be connected with the hub of the wind wheel;
the input gear pair comprises a first driving wheel and a first driven wheel, the first driving wheel is arranged at the end part of the input shaft, which is positioned in the box body, the first driven wheel is arranged in the box body, a plurality of first driven wheels are distributed around the first driving wheel and meshed with the first driving wheel, and the first driving wheel and the first driven wheel are bevel gears;
the parallel stage gear pair is arranged in the box body and is in transmission connection with the first driven wheel, and the parallel stage gear pair is used for realizing speed-increasing transmission; and
The output shaft is arranged in the box body and is in transmission connection with the parallel stage gear pair.
In one embodiment, support bearings are mounted on the input shaft at intervals, and the support bearings are mounted in the box body.
In one embodiment, the input gear pair further comprises a first parallel shaft rotatably mounted in the housing, 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, the first parallel shaft is provided with a first bearing, the first bearing is mounted on the box body, and the first bearing on one side of the first driven wheel, which is far away from the input shaft, is a thrust bearing.
In one embodiment, the parallel stage gear pair has a plurality of stages, and the parallel stage gear pair gradually reduces the split number in the transmission path by the power converging.
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, wherein the second driving wheel is installed at the other end of the first parallel shaft, the second parallel shaft is rotatably installed in the box body, the second driven wheel is installed at one end of the second parallel shaft, the second driven wheel is meshed with at least one second driving wheel, the third driving wheel is installed at the other end of the second parallel shaft, the third driven wheel is installed on the output shaft, and the third driven wheel is meshed with a plurality of 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 an area surrounded by the second driving wheels, and each second driven wheel is meshed with a plurality of the second driving wheels.
In one embodiment, a connecting shaft is arranged in the output shaft in a penetrating way, the third driven wheel is integrally formed on the connecting shaft, and the connecting shaft is flexibly connected with the output shaft.
In one embodiment, the box body comprises a front end cover, a first shell, a second shell, a third shell and a rear end cover which are sequentially connected, the input stage gear pair is located in the first shell, the second driving wheel and the second driven wheel are located in the second shell and the third shell, and the third driving wheel and the third driven wheel are located in the rear end cover.
The wind generating set speed increasing gear box has at least the following advantages:
1. the gearbox design incorporates a spindle function. The transmission chain of the unit adopting the gear box omits a separate main shaft component, comprising a main shaft, a main shaft supporting bearing and a bearing seat structure. 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. The input coupling is omitted from the unit transmission chain adopting the gearbox, and the hub of the fan is directly and rigidly connected with the input shaft of the gearbox. Because of no large input coupling, the transmission chain structure is simplified, the risk brought by the coupling is reduced, the cost is reduced, and the installation of the transmission chain is simplified.
3. The unit transmission chain adopting the gear box has the advantages that the main shaft component and the input coupling are omitted, the length of the transmission chain is greatly shortened, the length of the frame is correspondingly greatly shortened, and the weight is greatly reduced. The design difficulty of the frame structure is also simplified, the lightweight design of the frame is facilitated, and the cost of the frame is reduced.
4. The machine set transmission chain adopting the gear box has the advantages that the main shaft component and the input coupling are omitted, meanwhile, the machine frame is designed in a light-weight mode, the weight of the machine set 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, and the meshing axial force of the input gear pair can produce good counteracting effect on the thrust of the wind wheel, so that the load of the input shaft support bearing for bearing the main shaft is greatly reduced. Therefore, the difficulty in selecting the input shaft supporting bearing and the installation and debugging requirements are reduced; further improving the reliability of the transmission chain and reducing the cost of the transmission chain.
6. The gear box adopts a multi-split parallel transmission structure design, and the multi-split gear transmission structure is distributed around the input shaft bearing the main shaft function in parallel, so that radial space arrangement is fully utilized. The first driven wheels can uniformly split the meshing axial force of the primary gear pair into a plurality of stress points, so that the stress of a single position is reduced, and the force uniformly acts on the outer side of the box body. Therefore, the stress of the box body is improved, the difficulty of the structural design of the box body is reduced, the design of the light box body is facilitated, and the cost is reduced.
7. The length of a unit transmission chain adopting the gearbox is greatly shortened, the dynamic characteristic of the transmission chain is obviously improved, the reduction of the resonance frequency of a system is restrained, the risk that the resonance frequency falls into a working interval is reduced, the design difficulty of the unit is reduced, and the reliability of the unit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. Throughout the drawings, the elements or portions are not necessarily drawn to actual scale.
FIG. 1 is a schematic diagram of a wind turbine generator system speed increasing gearbox connected to a hub and a generator in an embodiment;
FIG. 2 is a cross-sectional view of the gearbox of FIG. 1;
FIG. 3 is a cross-sectional view of the gearbox 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-hub, 20-gear box, 21-box, 211-front end cover, 212-first shell, 213-second shell, 214-third shell, 215-rear end cover, 22-input shaft, 221-support bearing, 222-connecting flange, 223-connecting boss, 23-input gear pair, 231-first driving wheel, 232-first driven wheel, 233-first parallel shaft, 234-first bearing, 24-parallel gear pair, 241-second driving wheel, 242-second driven wheel, 243-second parallel shaft, 244-third driving wheel, 245-third driven wheel, 246-connecting sleeve, 25-output shaft, 26-connecting shaft, 27-rubber joint, 30-generator, 40-frame.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "fixed 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 are used herein for illustrative purposes only and are not meant to be the only embodiment.
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 herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1 and 2, a speed increasing gearbox 20 of a wind turbine generator system in an embodiment is used to connect a hub 10 and a generator 30, so as to increase a low-speed and high-torque of the hub 10 to a high-speed and low-torque and then transmit the high-speed and high-torque to the generator 30. Specifically, the wind turbine generator system speed increasing gearbox 20 includes a box body 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 housing 21, and the input shaft 22 extends out of the housing 21 for connection with the hub 10 of the wind turbine. Specifically, the input shaft 22 is provided with support bearings 221 at intervals, and the support bearings 221 are mounted on the housing 21, so that the input shaft 22 is rotatably mounted in the housing 21. One end of the input shaft 22 is gradually increased in diameter in a direction away from the case 21 and is formed with a connection flange 222, and the connection flange 222 is rigidly connected with the hub 10 by bolts, thereby realizing connection of the input shaft 22 and the hub 10.
Referring to fig. 3, 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 case 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 case 21, a plurality of first driven wheels 232 are distributed around the first driving wheel 231 and meshed with the first driving wheel 231, and the first driving wheel 231 and the first driven wheel 232 are both helical gears. Specifically, the input shaft 22 is provided with a connection boss 223, and the first driving wheel 231 is mounted on the connection boss 223 through a bolt, so that the first driving wheel 231 is mounted on the input shaft 22.
Referring to fig. 4 and 5 together, in one embodiment, the number of the first driven wheels 232 is at least two, and preferably an even number. In particular, 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 an embodiment, the input gear pair 23 further includes a first parallel shaft 233, the first parallel shaft 233 is rotatably mounted in the case 21, the first driven wheel 232 is mounted 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.
Further, based on the above embodiment, 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, and 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 housing 21, so that the first parallel shaft 233 is rotatably mounted in the housing 21. The first bearings 234 are disposed on opposite sides of the first driving wheel 231, and the first bearings 234 on the side, far away from the input shaft 22, of the first driven wheel 232 are used for bearing thrust, so as to bear the axial thrust of the first driven wheel 232 and transmit the axial thrust to the box 21.
The load generated by the wind wheel acts on the hub 10, and the wind wheel thrust, gravity, torque and transverse load from the hub 10 are all transmitted to the input shaft 22 because the hub 10 is directly and rigidly connected with the input shaft 22 of the gear box 20. The input shaft 22 transmits torque to the first driving wheel 231 installed in the middle of the input shaft, and the first driving wheel 231 is simultaneously meshed with a plurality of first driven wheels 232, so that power split transmission and speed increasing transmission are realized.
Because the input gear pair 23 adopts a helical tooth design, axial forces with the same magnitude and opposite directions are generated on the first driving wheel 231 and the first driven wheel 232 in engagement, and most or all of offset can be realized between the axial force on the first driving wheel 231 and the wind wheel thrust transmitted by the input shaft 22 by selecting a proper helical angle, so that the load born by the support bearing 221 is greatly reduced. The weight, lateral load and a small portion of the remaining rotor thrust of the hub 10 are transferred to the housing 21 via support bearings 221 at both ends of the input shaft 22 and further to the frame 40. The axial force borne by the first driven wheel 232 is transferred to the thrust bearings, and because the first driven wheel 232 is in multi-split transmission, the thrust bearings are correspondingly multiple, each thrust bearing only bears part of the axial force, and the axial force is transferred to the box 21 after being dispersed and borne by the thrust bearings and then transferred to the frame 40 through the box 21.
The parallel stage gear pair 24 is installed in the box 21 and is in transmission connection with the first driven wheel 232, the output shaft 25 is installed in the box 21, the output shaft 25 is in transmission connection with the parallel stage gear pair 24, the output shaft 25 extends out of the box 21 and is connected with the generator 30, and the parallel stage gear pair 24 is used for realizing speed-increasing transmission and increasing the rotating speed of the output shaft 25. The parallel stage gear pair 24 may be formed of a primary gear pair or a multistage gear pair as needed, and the parallel stage gear pair 24 is connected to the output shaft 25 after the final stage is merged.
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 number by power converging in the transmission path. In the present embodiment, the parallel stage gear pair 24 has two stages. It will be appreciated that in other embodiments, the number of stages of the parallel stage gear pair 24 may be specifically selected according to the speed increasing requirements.
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 wheel 241 is mounted at the other end of the first parallel shaft 233, and the first driven wheel 232 and the second driving wheel 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 wheel 242 is installed at one end of the second parallel shaft 243, the second driven wheel 242 is engaged with at least one second driving wheel 241, the third driving wheel 244 is installed at the other end of the second parallel shaft 243, the third driven wheel 245 is installed on the output shaft 25, and the third driven wheel 245 is simultaneously engaged with a plurality of third driving wheels 244.
The process of the gear box 20 for realizing the speed increase from the low rotation speed and the large torque to the high speed and the small torque is specifically as follows: the first driving wheel 231 drives the first driven wheel 232 to rotate, and since the first driving wheel 231 engages with the plurality of first driven wheels 232, the speed increase of the first driven wheels 232 can be realized, thus realizing the first speed increase transmission.
Then, the first parallel shaft 233 transmits torque to the second driving wheel 241, and the second driving wheel 241 drives the second driven wheel 242 to rotate. Since each of the second driven wheels 242 engages at least one of the second driving wheels 241, a second step-up transmission can be realized.
Finally, the second parallel shaft 243 transmits torque to the third driving wheel 244, and the third driving wheel 244 drives the third driven wheel 245, thereby driving the output shaft 25 to move. Since the third driven wheel 245 engages the plurality of third driving wheels 244, a third step-up transmission can be realized. The gearbox 20 realizes the speed increase from low rotation speed and high torque to high speed and low torque through three speed increasing transmissions.
Referring to fig. 3 and 6, further, 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 mounted on the corresponding first parallel shaft 233. In the present embodiment, the number of the second driving wheels 241 is 8. The number of the second driving wheels 241 is a multiple of that of the second driven wheels 242, and the second driven wheels 242 are located in 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-up transmission.
In particular, in the present embodiment, the number of the second driving wheels 241 is twice 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 that of the second driven wheels 242, and the second driven wheels 242 are individually meshed with the second driving wheels 241, or the number of the second driving wheels 241 and the number of the second driven wheels 242 may be 1 times, 2 times, or 3 times, respectively, according to the circumferential distribution positions, so long as each of the second driven wheels 242 and the second driving wheels 241 can be normally meshed.
Referring to fig. 7, in a specific embodiment, the second parallel shafts 243 are rotatably installed in the housing 21 through bearings, and the number of the second parallel shafts 243 is the same as the number of the second driven wheels 242, and one second driven wheel 242 is installed 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, so that the second driven wheels 242 and the third driving wheels 244 are respectively arranged at two ends of the second parallel shafts 243. In the present embodiment, the number of the third driving wheels 244 is 4.
In an 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 gear shafts, so that the installation process is simple, and the compactness of the structure is ensured. The third driving wheel 244 surrounds the third driven wheel 245, and a plurality of the third driving wheels 244 are engaged with the third driven wheel 245. In this embodiment, 4 third driving wheels 244 are meshed with third driven wheels 245.
In an embodiment, the second parallel shaft 243 is provided with a connecting sleeve 246, the third driving wheel 244 is mounted on the connecting sleeve 246 through bolts, and the third driving wheel 244 is mounted on the second parallel shaft 243. A connecting shaft 26 is arranged in the output shaft 25 in a penetrating way, the third driven wheel 245 is integrally formed on the connecting shaft 26, and the connecting shaft 26 is flexibly connected with the output shaft 25. The connecting shaft 26 and the output shaft 25 are flexibly connected, so that the output shaft 25 can deviate in angle or radial direction relative to the connecting shaft 26, and the connection of the output shaft 25 and the generator 30 is facilitated. Specifically, the connection shaft 26 is flexibly connected to the output shaft 25 through a rubber joint 27.
In one embodiment, the case 21 includes a front cover 211, a first housing 212, a second housing 213, a third housing 214, and a rear cover 215, which are sequentially connected. The input stage gear pair 23 is disposed in the first housing 212, the second driving wheel 241 and the second driven wheel 242 are disposed in the second housing 213 and the third housing 214, and the third driving wheel 244 and the third driven wheel 245 are disposed in the rear end cover 215. The box 21 is formed by splicing multiple parts, so that the input stage gear pair 23 and the parallel stage gear pair 24 can be conveniently assembled and disassembled.
The wind turbine generator system speed increasing gearbox 20 has a main shaft function integrated with the structural design of the gearbox 20, and the input shaft 22, the support bearing 221 and the box 21 of the gearbox 20 are used for bearing the main shaft, the main shaft bearing and the bearing seat. With the drive train of the gearbox 20, no separate main shaft component is required, and the wind wheel hub 10 is directly mounted at the input end of the gearbox 20. The input shaft 22 is located at the center of the rotation axis of the box 21, the first driving wheel 231 is installed in the middle of the shaft section of the input shaft, and the plurality of power branch first driven wheels 232 are circumferentially distributed around the input shaft 22, so that radial space is fully utilized. Due to the parallel helical gear structure, all the meshing axial forces of the first drive wheel 231 act on the input shaft 22, and the mutual offset effect is realized with the wind wheel thrust force simultaneously acting on the input shaft 22. And each engagement axial force of the first driven wheel 232 is greatly reduced due to the multiple split flows and uniformly dispersed to the outside of the casing 21. The meshing axial force of the part is divided into a plurality of parts and is dispersed outside the box body 21, so that the loading deformation of the box body 21 is greatly reduced, and the design of the box body 21 is facilitated to be light. The upper input end of the gearbox 20 is provided with the connecting flange 222, the wind wheel can be directly installed on the connecting flange 222 without a separate large-scale coupler, so that the installation risk brought by the coupler is eliminated, the weight of a transmission chain is reduced, and the cost is reduced.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (8)
1. A wind turbine generator set step-up gearbox, comprising:
a case;
the input shaft is rotatably arranged in the box body and extends out of the box body to be connected with the hub of the wind wheel;
the input gear pair comprises a first driving wheel and a first driven wheel, the first driving wheel is arranged at the end part of the input shaft, which is positioned in the box body, the first driven wheel is arranged in the box body, a plurality of first driven wheels are distributed around the first driving wheel and meshed with the first driving wheel, and the first driving wheel and the first driven wheel are bevel gears; the first driving wheel and the first driven wheel generate axial forces with the same magnitude and opposite directions, the axial forces on the first driving wheel face to the outside of the box body and at least partially offset with the wind wheel thrust transmitted on the input shaft, and the axial forces on the first driven wheel are transmitted to the box body;
the parallel stage gear pair is arranged in the box body and is in transmission connection with the first driven wheel, and the parallel stage gear pair is used for realizing speed-increasing transmission; and
The output shaft is arranged in the box body and is in transmission connection with the parallel stage gear pair;
the input gear pair further comprises a first parallel shaft, the first parallel shaft is rotatably arranged in the box body, the first driven wheel is arranged 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;
the first parallel shaft is provided with a first bearing, the first bearing is arranged on the box body, and the first bearing on one side of the first driven wheel, which is far away from the input shaft, is a thrust bearing;
the axial force born by the first driven wheel is transferred to the plurality of thrust bearings, so that each thrust bearing only bears part of the axial force, and the axial force is transferred to the box body after being dispersed and borne by the thrust bearings.
2. The wind turbine generator system of claim 1, wherein support bearings are mounted on the input shaft at intervals, the support bearings being mounted within the housing.
3. The wind turbine generator system speed increasing gearbox of claim 1, wherein the parallel stage gear pair has a plurality of stages, the parallel stage gear pair gradually decreasing the number of splits in the transfer path by power sink flow.
4. A wind generating set speed increasing gearbox according to claim 3, wherein the parallel stage gear pair comprises 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 meshed with at least one second driving wheel, 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 meshed with a plurality of third driving wheels.
5. The wind turbine generator system of claim 4, wherein 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.
6. The wind turbine generator system speed increasing gearbox of claim 4, wherein the number of second driven wheels is a multiple of the second driven wheels, the second driven wheels being located within an area surrounded by the second driven wheels, each of the second driven wheels engaging a plurality of the second driven wheels.
7. The speed-increasing gearbox of a wind turbine generator system according to claim 4, wherein a connecting shaft is arranged in the output shaft in a penetrating manner, the third driven wheel is integrally formed on the connecting shaft, and the connecting shaft is flexibly connected with the output shaft.
8. The wind turbine generator system speed increasing gearbox of claim 4, wherein the housing includes a front end cover, a first housing, a second housing, a third housing, and a rear end cover that are connected in sequence, the input gear pair is located in the first housing, the second driving wheel and the second driven wheel are located in the second housing and the third housing, and the third driving wheel and the third driven wheel are located in the rear end cover.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111265997.XA CN113915319B (en) | 2021-10-28 | 2021-10-28 | Speed increasing gear box of wind generating set |
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| CN202111265997.XA CN113915319B (en) | 2021-10-28 | 2021-10-28 | Speed increasing gear box of wind generating set |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588226A (en) * | 2010-12-30 | 2012-07-18 | 通用电气公司 | Drivetrain for generator in wind turbine |
| CN104595124A (en) * | 2015-01-04 | 2015-05-06 | 沈阳工业大学 | Gearbox device for wind driven generator |
| CN103154510B (en) * | 2010-10-13 | 2016-04-13 | 奥托因温特特兰斯普公司 | Fixed gear unit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003269553A (en) * | 2002-03-15 | 2003-09-25 | Kanzaki Kokyukoki Mfg Co Ltd | Speed increase device for wind power generator |
| DE10357026B3 (en) * | 2003-12-03 | 2005-06-09 | Repower Systems Ag | Wind turbine |
| CN101476545A (en) * | 2008-01-02 | 2009-07-08 | 新疆金风科技股份有限公司 | Wind generator set |
| NL2008103C2 (en) * | 2011-03-14 | 2013-07-15 | Nestor Man Consultants B V | Transmission. |
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2021
- 2021-10-28 CN CN202111265997.XA patent/CN113915319B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103154510B (en) * | 2010-10-13 | 2016-04-13 | 奥托因温特特兰斯普公司 | Fixed gear unit |
| CN102588226A (en) * | 2010-12-30 | 2012-07-18 | 通用电气公司 | Drivetrain for generator in wind turbine |
| CN104595124A (en) * | 2015-01-04 | 2015-05-06 | 沈阳工业大学 | Gearbox device for wind driven generator |
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