Novel gearbox for wind power generation

Abstract

The utility model provides a novel gear box for wind power generation, which relates to the technical field of wind power generation equipment and comprises three rows of roller bearings and a gear box body, the three rows of roller bearings comprise outer rings, first inner rings and second inner rings, the outer rings are fixedly connected with a shell in the gear box body, and the first inner rings are fixedly connected with the second inner rings; the second inner ring is arranged close to the gear box body, an annular flange is arranged on the inner wall face of the second inner ring, a connecting through hole is formed in the annular flange, and an inner threaded hole is formed in a planet carrier in the gear box body; a positioning protrusion is further arranged on the annular wall face of the annular flange, an annular positioning cylinder is arranged on the end face of the planet carrier, a positioning groove matched with the positioning protrusion in shape is formed in the outer wall of the positioning cylinder, and the positioning protrusion and the positioning groove are clamped and fixed. The planet carrier is simple in structure, the problem of unbalance loading of the planet carrier caused by low coaxiality of the main shaft and the planet carrier is avoided, and the installation process is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation equipment, in particular to a novel gear box for wind power generation. Background Art

[0002] With the continuous growth of the capacity of wind turbine generator sets, the diameter of wind turbine rotors is getting larger and larger. Long blades and high towers have become the mainstream of development due to their good economic efficiency. As the blades are getting longer and longer and the power of the single unit is getting larger and larger, the load on the main bearings of wind turbines is getting larger and larger, and the requirements are getting higher and higher. At the same time, the main bearings and gearboxes of wind turbines are the most critical components of the wind turbine transmission chain, and the reliability requirements are very high. Conventional main bearing and gearbox designs are increasingly difficult to meet the matching design of high-power units.

[0003] In order to meet the requirements of long-blade high-power wind turbines for the main bearing and gearbox transmission system, the main transmission methods are as follows: The first solution: the wind turbine gearbox matches the main shaft and two single-row tapered main bearings, and the gearbox primary gear ring has a support bearing. This solution has high system cost, high requirements for the design clearance and running clearance of the single-row tapered bearing pairing, difficult installation, and the bearing service life is greatly affected by the use environment. The second solution: two single-row tapered main bearings are set in the wind turbine gearbox to support the main shaft, the main shaft and the gearbox are rigidly connected, the front end of the compact gearbox primary planetary frame has no support bearing, and the gearbox primary gear ring is connected to the main bearing seat. This solution is lower in cost than the first solution, but the main bearing problem still exists. In addition, due to the long main shaft size and bearing stiffness problems, the deformation of the integrated gearbox primary planetary frame leads to the planetary gear eccentric load, and the gear modification or the deformation of the planetary gear flexible pin is used to compensate for the tooth surface meshing deviation caused by the overall system deformation. At present, the technology of this solution is immature, the gear system design and manufacturing are difficult, and there are great technical risks.

[0004] In summary, the existing high-power wind turbine gearbox has the disadvantages of insufficient load-bearing capacity of the primary planetary carrier bearing, greater use risk, poor gear accuracy and adaptability, etc. Therefore, a new type of wind turbine gearbox is urgently needed to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a new type of gearbox for wind power generation to solve the problems existing in the above-mentioned prior art. It has a simple structure, avoids the problem of uneven loading of the planetary frame caused by low coaxiality between the main shaft and the planetary frame, and makes the installation process more convenient.

[0006] To achieve the above purpose, the utility model provides the following solutions:

[0007] A novel gearbox for wind power generation comprises a three-row roller bearing and a gearbox body, wherein the gearbox body comprises a housing and a transmission assembly arranged inside the housing, wherein the three-row roller bearing comprises a coaxially arranged outer ring, a first inner ring and a second inner ring, wherein the outer ring is fixedly connected to the housing, and the first inner ring and the second inner ring are fixedly connected; the second inner ring is arranged close to the gearbox body, an annular flange extending radially inward is arranged on the inner wall surface of the second inner ring, a connecting through hole is arranged on the annular flange, an internal threaded hole is arranged on the planet carrier at the power input end of the transmission assembly, the connecting through hole is directly opposite to the internal threaded hole, and the annular flange is fixedly connected to the planet carrier by bolts; a positioning protrusion is also arranged on the annular wall surface of the annular flange, an annular positioning cylinder is arranged on the end surface of the planet carrier, the outer diameter of the positioning cylinder is adapted to the inner diameter of the annular flange, a positioning groove adapted to the shape of the positioning protrusion is arranged on the outer wall of the positioning cylinder, and the positioning protrusion is fixedly connected to the positioning groove by clamping.

[0008] Preferably, the positioning protrusion and the positioning groove are both arranged along the axial direction of the second inner ring.

[0009] Preferably, in the axial direction of the second inner ring, the positioning protrusion is a conical shape with an outer end diameter smaller than an inner end diameter; in the axial direction of the planetary carrier, the positioning groove is a conical shape with an outer end diameter larger than an inner end diameter.

[0010] Preferably, radial cross-sections of the positioning protrusion and the positioning groove are both arc-shaped, square-shaped or trapezoidal-shaped.

[0011] Preferably, a plurality of the positioning protrusions and the positioning grooves are uniformly arranged along the circumferential direction.

[0012] Preferably, the annular flange and the positioning tube have the same axial size.

[0013] Preferably, an oil shell for storing lubricating oil is provided on the shell, and an oil inlet channel and an oil outlet channel are respectively provided at the top and bottom ends of the outer ring, and the oil inlet channel and the oil outlet channel are both connected to the oil shell, and an oil pump fixed to the shell is also provided between the oil inlet channel and the oil shell.

[0014] Preferably, a filter screen is provided between the oil casing and the oil pump.

[0015] Compared with the prior art, the utility model has the following technical effects:

[0016] 1. The novel wind power generation gearbox in the utility model realizes the connection between the three-row roller bearing and the transmission assembly inside the gearbox by connecting the annular flange in the three-row roller bearing with the planet carrier in the gearbox body; after the wind wheel is connected to the first inner ring, the transmission assembly inside the gearbox body can be driven to rotate by the second inner ring, without the need to use the main shaft to transmit power, and without the need to install two single-row tapered main bearings, which not only makes the transmission structure simpler as a whole, but also avoids the problem of eccentric load on the planet carrier caused by low coaxiality between the main shaft and the planet carrier;

[0017] 2. In the utility model, the three-row roller bearing can be prevented from rotating by cooperating with the positioning protrusion and the positioning groove, and the initial positioning of the three-row roller bearing is completed during installation, so that the connecting through hole on the annular flange is aligned with the internal threaded hole on the planetary frame, reducing the difficulty of aligning the connecting through hole and the internal threaded hole; at the same time, the positioning cylinder can pre-support the three-row roller bearing, and during the connection process, the staff does not need to support the three-row roller bearing through manpower or lifting equipment, which makes it easier for the staff to connect the annular flange to the planetary frame.

[0018] In other technical solutions of the utility model, both the positioning protrusion and the positioning groove are conical in shape, which further reduces the difficulty of plugging and positioning the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 This is a schematic diagram of the overall structure of a new type of wind power generation gearbox in the utility model;

[0021] Figure 2 is a schematic diagram of the axial structure of the second inner ring;

[0022] Figure 3 Schematic diagram of the axial structure of the planet carrier;

[0023] Figure 4 Schematic diagram of radial structure of planet carrier;

[0024] Figure 5 It is a structural schematic diagram of the oil inlet channel;

[0025] Description of reference numerals:

[0026] 1. Outer ring; 2. First inner ring; 3. Second inner ring; 4. Housing; 5. Planet carrier; 6. Annular flange; 7. Positioning cylinder; 8. Positioning protrusion; 9. Positioning groove; 10. Oil inlet channel. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The utility model aims to provide a new type of gearbox for wind power generation to solve the problems existing in the above-mentioned prior art. It has a simple structure, avoids the problem of uneven loading of the planetary frame caused by low coaxiality between the main shaft and the planetary frame, and makes the installation process more convenient.

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figure 1 to Figure 5 As shown, this embodiment provides a new type of wind power generation gearbox, including three-row roller bearings and a gearbox body, the gearbox body including a housing 4 and a transmission assembly arranged inside the housing 4. The transmission assembly includes a planet carrier 5, planetary gears and other transmission components, the specific structure of which is well known to those skilled in the art, and this embodiment will not be repeated here. The three-row roller bearing includes a coaxially arranged outer ring 1, a first inner ring 2 and a second inner ring 3, wherein the outer ring 1 is fixedly connected to the housing 4 in the gearbox body, and the first inner ring 2 and the second inner ring 3 are fixedly connected, and both fixed connection methods can be bolted. The first inner ring 2 is used to connect the wind wheel, and the second inner ring 3 is arranged closer to the gearbox body than the first inner ring 2. An annular flange 6 extending radially inward is arranged on the inner wall surface of the second inner ring 3, and a connecting through hole parallel to the axial direction is arranged on the annular flange 6. An internal threaded hole is arranged on the planet carrier 5 at the power input end of the transmission assembly, and the connecting through hole is directly opposite to the internal threaded hole, and the annular flange 6 is fixedly connected to the planet carrier 5 by bolts. Furthermore, in this embodiment, an annular positioning cylinder 7 extending axially toward the second inner ring 3 is provided on the end surface of the planet carrier 5, and the outer diameter of the positioning cylinder 7 is adapted to the inner diameter of the annular flange 6, which can be a clearance fit. A positioning protrusion 8 extending radially inward is also provided on the annular wall surface of the annular flange 6, and a positioning groove 9 matching the shape of the positioning protrusion 8 is provided on the outer wall of the positioning cylinder 7, and the positioning protrusion 8 is fixedly engaged with the positioning groove 9, and the positioning protrusion 8 and the positioning groove 9 can also be a clearance fit.

[0031] The new type of wind power generation gearbox in this embodiment realizes the connection between the three-row roller bearing and the transmission assembly inside the gearbox by connecting the annular flange 6 in the three-row roller bearing with the planet carrier 5 in the gearbox body. After the wind wheel is connected to the first inner ring 2, the transmission assembly inside the gearbox body can be driven to rotate through the second inner ring 3. There is no need to use the main shaft to transmit power, nor is there any need to install two single-row tapered main bearings. This makes the transmission structure simpler as a whole and avoids the problem of eccentric load on the planet carrier 5 caused by low coaxiality between the main shaft and the planet carrier 5. In addition, the three-row roller bearing structure has good rigidity, and the relative deformation of the first inner ring 2, the second inner ring 3 and the outer ring 1 is extremely small, which can meet the good load transmission under the rigid connection between the gearbox body and the three-row roller bearing. When connecting the three-row roller bearing and the gear box body, inserting the positioning protrusion 8 into the positioning groove 9 can prevent the three-row roller bearing from rotating, thereby completing the initial positioning of the three-row roller bearing, so that the connecting through hole on the annular flange 6 is aligned with the internal threaded hole on the planetary carrier 5, reducing the difficulty of aligning the connecting through hole and the internal threaded hole; at the same time, the positioning cylinder 7 can pre-support the three-row roller bearing. During the connection process, the staff does not need to support the three-row roller bearing through manpower or lifting equipment, which makes it easier for the staff to connect the annular flange 6 to the planetary carrier 5.

[0032] Furthermore, in this embodiment, the axial dimensions of the annular flange 6 and the positioning cylinder 7 are equal; the positioning protrusion 8 and the positioning groove 9 are both arranged along the axial direction of the second inner ring 3, and the axial lengths of the positioning protrusion 8 and the positioning groove 9 are equal to the lengths of the annular flange 6 and the positioning cylinder 7.

[0033] In order to further facilitate the positioning protrusion 8 to be clamped in the positioning groove 9, in the axial direction of the second inner ring 3, the positioning protrusion 8 is a tapered shape with a diameter of the outer end (the end close to the planetary carrier 5) smaller than the diameter of the inner end (the end away from the planetary carrier 5); in the axial direction of the planetary carrier 5, the positioning groove 9 is a tapered shape with a diameter of the outer end (the end close to the second inner ring 3) larger than the diameter of the inner end (the end away from the planetary carrier 5). When the positioning protrusion 8 is plugged into the positioning card slot, it can be guided by the tapered shape, which reduces the difficulty of plugging the positioning protrusion 8 into the positioning groove 9.

[0034] Furthermore, in this embodiment, the radial cross-sections of the positioning protrusion 8 and the positioning groove 9 are both arc-shaped, square-shaped or trapezoidal-shaped.

[0035] Furthermore, in this embodiment, a plurality of positioning protrusions 8 and positioning grooves 9 are evenly arranged along the circumferential direction.

[0036] like Figure 5As shown, in order to ensure the stability of the operation of the three-row roller bearing, an oil shell for storing lubricating oil is provided on the housing 4 in this embodiment, and an oil inlet channel 10 and an oil outlet channel are respectively provided at the top and bottom ends of the outer ring 1, and the oil outlet channel has the same structure as the oil inlet channel 10. The oil inlet channel 10 and the oil outlet channel are both connected to the area where the rollers in the three-row roller bearing are located. The oil inlet channel 10 and the oil outlet channel are both connected to the pipeline oil shell, and an oil pump fixed to the housing 4 is also provided on the pipeline between the oil inlet channel 10 and the oil shell. The oil pump is used to provide circulation power for the lubricating oil.

[0037] In order to prevent impurities in the lubricating oil from entering the oil pump and the three-row roller bearing, a filter screen is provided between the oil housing and the oil pump in this embodiment.

[0038] Adaptive changes made according to actual needs are all within the protection scope of this utility model.

[0039] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A new type of wind power generation gearbox, characterized in that: The invention comprises a three-row roller bearing and a gearbox body, wherein the gearbox body comprises a housing and a transmission assembly arranged inside the housing, wherein the three-row roller bearing comprises a coaxially arranged outer ring, a first inner ring and a second inner ring, wherein the outer ring is fixedly connected to the housing, and the first inner ring and the second inner ring are fixedly connected; the second inner ring is arranged close to the gearbox body, an annular flange extending radially inward is arranged on the inner wall surface of the second inner ring, a connecting through hole is arranged on the annular flange, an internal threaded hole is arranged on the planetary carrier at the power input end of the transmission assembly, the connecting through hole is directly opposite to the internal threaded hole, and the annular flange is fixedly connected to the planetary carrier by bolts; a positioning protrusion is also arranged on the annular wall surface of the annular flange, and an annular positioning cylinder is arranged on the end surface of the planetary carrier, the outer diameter of the positioning cylinder is adapted to the inner diameter of the annular flange, a positioning groove adapted to the shape of the positioning protrusion is arranged on the outer wall of the positioning cylinder, and the positioning protrusion is fixedly connected to the positioning groove by clamping.

2. The novel wind power generation gearbox according to claim 1 is characterized in that: The positioning protrusion and the positioning groove are both arranged along the axial direction of the second inner ring.

3. The novel wind power generation gearbox according to claim 2 is characterized in that: In the axial direction of the second inner ring, the positioning protrusion is a conical shape with an outer end diameter smaller than an inner end diameter; in the axial direction of the planet carrier, the positioning groove is a conical shape with an outer end diameter larger than an inner end diameter.

4. The novel wind power generation gearbox according to claim 3 is characterized in that: The radial cross sections of the positioning protrusion and the positioning groove are both arc-shaped, square-shaped or trapezoidal-shaped.

5. The novel wind power generation gearbox according to claim 3 is characterized in that: A plurality of the positioning protrusions and the positioning grooves are evenly arranged along the circumferential direction.

6. The novel wind power generation gearbox according to claim 1 is characterized in that: The annular flange and the positioning tube have the same axial dimensions.

7. The novel wind power generation gearbox according to any one of claims 1 to 6, characterized in that: The housing is provided with an oil shell for storing lubricating oil, the top and bottom ends of the outer ring are respectively provided with an oil inlet channel and an oil outlet channel, the oil inlet channel and the oil outlet channel are both connected to the oil shell, and an oil pump fixed to the housing is also provided between the oil inlet channel and the oil shell.

8. The novel wind power generation gearbox according to claim 7 is characterized in that: A filter screen is arranged between the oil housing and the oil pump.

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