Planetary gearbox

Abstract

The invention belongs to the technical field of wind power gear boxes, and discloses a planetary gear box. The planetary gearbox comprises a first planet carrier, a second planet carrier and a supporting bearing, the first planet carrier, the supporting bearing and the second planet carrier are sequentially arranged in the gearbox body in the axial direction of the main shaft, and the first planet carrier is in running fit with the second planet carrier through the supporting bearing. The first planet carrier and the second planet carrier of the planetary gear box are in direct running fit through the supporting bearing, an abutting structure does not need to be arranged on the gear box body to be connected with the supporting bearing, and therefore the structure of the gear box body is simplified, meanwhile, the axial space occupied when the multiple stages of planet carriers are arranged is reduced, the axial length of the gear box body is shortened, and the service life of the gear box body is prolonged. Therefore, the overall weight of the planetary gearbox is reduced, and the manufacturing cost of the planetary gearbox is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power gearboxes, and in particular to a planetary gearbox. Background Art

[0002] In the planetary gearbox commonly used in wind turbines, each level of the planetary carrier is supported by the gearbox body, that is, the planetary carrier rotates with the gearbox body through bearings; and due to the limitation of the gearbox body's support function for each level of the planetary carrier, the gearbox body needs to be provided with a special abutment structure and its axial length is lengthened to ensure the installation stability of the planetary carrier. However, due to the complex structure and large size of the above-mentioned gearbox body, the overall weight of the gearbox is increased, which is not convenient for the overall lifting and installation of the gearbox.

[0003] Therefore, it is urgent to design a gearbox to solve the above problems existing in the prior art. Summary of the invention

[0004] An object of the present invention is to provide a planetary gearbox capable of shortening the axial length of the gearbox body to reduce weight and manufacturing cost.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a planetary gearbox, comprising a first planet carrier, a second planet carrier and a support bearing. The first planet carrier, the support bearing and the second planet carrier are sequentially arranged in a gearbox body along the axial direction of a main shaft, and the first planet carrier is rotatably matched with the second planet carrier through the support bearing.

[0007] Preferably, the support bearing is arranged between the first planet carrier and the second planet carrier, the outer ring of the support bearing is interference fit with the first planet carrier, and the inner ring of the support bearing is interference fit with the second planet carrier.

[0008] Preferably, the second planet carrier comprises a gear spoke plate for supporting the planetary gears and a support platform arranged on the gear spoke plate, and the inner ring of the support bearing is interference connected to the support platform.

[0009] Preferably, an abutment groove is provided on the first planet carrier around the outer side of the support platform, and the outer ring of the support bearing is clamped in the abutment groove.

[0010] Preferably, the abutment groove has a first abutment surface and a second abutment surface, the first abutment surface abuts against the outer ring of the support bearing along the radial direction of the main shaft, and the second abutment surface abuts against the outer ring of the support bearing along the axial direction of the main shaft.

[0011] Preferably, the support platform has a mounting surface and a docking surface, the mounting surface abuts against the inner ring of the support bearing along the radial direction of the main shaft, and the docking surface abuts against the inner ring of the support bearing along the axial direction of the main shaft.

[0012] Preferably, a weight-reducing groove is provided between the supporting platform and the gear spoke plate.

[0013] Preferably, the thickness of the supporting platform gradually increases along a direction approaching the gear spoke plate.

[0014] Preferably, the support platform is arranged around the gear spoke plate.

[0015] Preferably, the support bearing is a tapered bearing.

[0016] The beneficial effects of the present invention are:

[0017] The planetary gearbox provided by the present invention comprises a first planetary carrier, a support bearing and a second planetary carrier. Since the first planetary carrier, the support bearing and the second planetary carrier are arranged in sequence along the axial direction of the main shaft, and the first planetary carrier is rotationally matched with the second planetary carrier through the support bearing, the planetary gearbox can realize a normal multi-stage planetary transmission function through the first planetary carrier and the second planetary carrier; the first planetary carrier and the second planetary carrier of the planetary gearbox are directly rotationally matched through the support bearing, and there is no need to set an abutment structure on the gear box body to connect with the support bearing, thereby simplifying the structure of the gear box body, and at the same time reducing the axial space occupied by the multi-stage planetary carrier arrangement, shortening the axial length of the gear box body, thereby reducing the overall weight of the planetary gearbox, and reducing the manufacturing cost of the planetary gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a partial cross-sectional view of a planetary gearbox provided in a specific embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0020] In the figure:

[0021] 100-spindle;

[0022] 200-gear box;

[0023] 1-first planet carrier; 11-first abutting surface; 12-second abutting surface;

[0024] 2-second planet carrier; 21-gear spoke plate; 22-supporting platform; 221-mounting surface; 222-joining surface;

[0025] 3-Support bearing;

[0026] 4-Weight reduction slot. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] like Figure 1 and Figure 2 As shown, the present invention provides a planetary gearbox, which includes a first planetary carrier 1, a second planetary carrier 2 and a support bearing 3. The first planetary carrier 1, the support bearing 3 and the second planetary carrier 2 are sequentially arranged in a gearbox body 200 along the axial direction of a main shaft 100; the first planetary carrier 1 is rotatably matched with the second planetary carrier 2 through the support bearing 3.

[0032] Since the first planetary carrier 1, the support bearing 3 and the second planetary carrier 2 are arranged in sequence along the axial direction of the main shaft 100, and the first planetary carrier 1 is rotatably matched with the second planetary carrier 2 through the support bearing 3, the planetary gearbox can realize a normal multi-stage planetary transmission function through the first planetary carrier 1 and the second planetary carrier 2; the first planetary carrier 1 and the second planetary carrier 2 of the planetary gearbox are directly rotatably matched through the support bearing 3, and there is no need to set an abutment structure on the gear box body 200 to connect with the support bearing 3, thereby simplifying the structure of the gear box body 200, and at the same time reducing the axial space occupied by the multi-stage planetary carrier arrangement, shortening the axial length of the gear box body 200, thereby reducing the overall weight of the planetary gearbox, and reducing the manufacturing cost of the planetary gearbox.

[0033] Specifically, Figure 1 and Figure 2 As shown, the support bearing 3 is arranged between the first planet carrier 1 and the second planet carrier 2, the outer ring of the support bearing 3 is interference fit with the first planet carrier 1, and the inner ring of the support bearing 3 is interference fit with the second planet carrier 2, so as to ensure the connection reliability between the support bearing 3 and the first planet carrier 1 and the second planet carrier 2, respectively, and avoid slipping between the first planet carrier 1 and the outer ring of the support bearing 3, and between the second planet carrier 2 and the inner ring of the support bearing 3. In another embodiment, the inner ring of the support bearing 3 is integrally formed with the second planet carrier 2, and the outer ring of the support bearing 3 is integrally formed with the first planet carrier 1. After the first planet carrier 1 and the second planet carrier 2 are assembled, the rolling body is filled between the inner ring and the outer ring to form the support bearing 3, so as to achieve the normal rotation fit between the first planet carrier 1 and the second planet carrier 2.

[0034] Furthermore, if Figure 1 As shown, in order to ensure the normal rotation of the planetary gears on the first planetary carrier 1 and the normal lubrication of the support bearing 3, the first planetary carrier 1 and the second planetary carrier 2 maintain a certain distance in the axial direction, so that the lubricating oil can smoothly flow into the support bearing 3 in the radial direction through the planetary gear part of the first planetary carrier 1, thereby achieving lubrication of the support bearing 3.

[0035] In this embodiment, the planetary gears on the first planetary carrier 1 and the second planetary carrier 2 are meshed with the inner gear ring on the gear box 200. When the first planetary carrier 1 and the second planetary carrier 2 are driven to rotate by the main shaft 100, the first planetary carrier 1 and the second planetary carrier 2 respectively rotate in coordination with the gear box 200.

[0036] like Figure 2As shown, the second planetary carrier 2 includes a gear spoke plate 21 for supporting the planetary gear and a support platform 22 arranged on the gear spoke plate 21. The inner ring of the support bearing 3 is interference connected to the support platform 22. The support platform 22 is protruded on the gear spoke plate 21 along the axial direction of the main shaft 100. The support platform 22 is used to install the support bearing 3 so that the support bearing 3 and the second planetary carrier 2 can be effectively installed and matched.

[0037] In order to facilitate the rapid positioning and installation of the support bearing 3, and also to improve the stability of the support bearing 3 during operation, as Figure 2 As shown, the first planetary carrier 1 is provided with an abutment groove, which is arranged around the outer side of the support platform 22, and the outer ring of the support bearing 3 is clamped in the abutment groove; it can be understood that the abutment groove is arranged in an annular shape on the first planetary carrier 1 opposite to the support platform 22.

[0038] The support bearing 3 is a tapered bearing, the purpose of which is to improve the load-bearing capacity of the planetary gearbox and enable the first planet carrier 1 and the second planet carrier 2 to rotate together while also transmitting the axial load along the main shaft 100 .

[0039] Specifically, Figure 2 As shown, the abutment groove has a first abutment surface 11 and a second abutment surface 12, the first abutment surface 11 abuts against the outer ring of the support bearing 3 along the radial direction of the main shaft 100, and the second abutment surface 12 abuts against the outer ring of the support bearing 3 along the axial direction of the main shaft 100. In this embodiment, the abutment groove is an L-shaped groove, the first abutment surface 11 and the second abutment surface 12 are perpendicular to each other, and the first abutment surface 11 and the second abutment surface 12 extend along the circumferential direction of the main shaft 100 respectively. When the outer ring of the support bearing 3 is placed in the abutment groove, the outer peripheral surface and the end surface of the outer ring can be respectively abutted against the first abutment surface 11 and the second abutment surface 12, thereby realizing the rapid positioning and installation of the support bearing 3, and at the same time, the outer ring of the support bearing 3 can abut against the second abutment surface 12 along the axial direction, which can prevent the first planet carrier 1 and the second planet carrier 2 from moving relative to each other along the axial direction, thereby realizing the effective transmission of the axial load of the main shaft 100.

[0040] Furthermore, if Figure 2 As shown, the support platform 22 has a mounting surface 221 and a docking surface 222. The mounting surface 221 abuts against the inner ring of the support bearing 3 along the radial direction of the main shaft 100, and the docking surface 222 abuts against the inner ring of the support bearing 3 along the axial direction of the main shaft 100; specifically, the mounting surface 221 and the docking surface 222 are perpendicular to each other, and the mounting surface 221 and the docking surface 222 extend along the circumferential direction of the main shaft 100 respectively. When the inner ring of the support bearing 3 is installed on the support platform 22, the inner circumferential surface and the end surface of the inner ring can be abutted against the mounting surface 221 and the docking surface 222 respectively, so that the support bearing 3 can be quickly installed in place. At the same time, the abutting groove cooperates with the support platform 22, which can effectively transmit the axial load along the main shaft 100 and prevent the support bearing 3 from moving axially.

[0041] In order to further reduce the weight of the planetary gearbox and reduce the material consumption, Figure 2 As shown, a weight-reducing groove 4 is provided between the support platform 22 and the gear spoke plate 21. Specifically, the weight-reducing groove 4 is continuously provided around the gear spoke plate 21 in a circle, thereby greatly reducing the weight of the planetary gearbox; in another embodiment, several weight-reducing grooves 4 are intermittently provided along the circumference of the gear spoke plate 21, which not only meets the weight reduction requirement of the planetary gearbox, but also ensures the structural strength of the second planet carrier 2.

[0042] Furthermore, if Figure 2 As shown, the thickness of the support platform 22 gradually increases along the direction approaching the gear spoke plate 21 , so that the connection between the support platform 22 and the gear spoke plate 21 is more firm and reliable, thereby ensuring the support stability of the support bearing 3 .

[0043] Specifically, the mounting surface 221 of the support platform 22 is parallel to the axial direction of the main shaft 100 , and along the direction approaching the gear spoke plate 21 , the side of the support platform 22 opposite to the mounting surface 221 gradually approaches the axis of the main shaft 100 .

[0044] A plurality of support platforms 22 may be arranged at intervals along the circumference of the main shaft 100, or one support platform 22 may be completely arranged along the circumference of the main shaft 100; in the present embodiment, the support platform 22 is arranged around the gear spoke plate 21 to form a continuous and complete annular structure, thereby further improving the reliability of the connection between the support bearing 3 and the second planetary carrier 2; in another embodiment, several support platforms 22 are arranged at intervals along the circumference of the main shaft 100, which reduces the material used and the weight of the planetary gearbox while ensuring the stability of the connection with the support bearing 3.

[0045] In this embodiment, the planetary gearbox has a three-stage planetary transmission mechanism, which is sequentially arranged inside the gearbox body 200 along the circumference of the main shaft 100; the main shaft 100 is fixedly connected to the first planetary carrier 1 by bolts, and the gearbox body 200 is provided with a plurality of inner gear rings cooperating with the planetary transmission mechanisms at each stage, and the plurality of planetary gears on the first planetary carrier 1, the second planetary carrier 2 and the third planetary carrier are respectively meshed with the respective inner gear rings of the gearbox body 200, and the second planetary carrier 2 is rotationally matched with the first planetary carrier 1 through the support bearing 3, and the sun gear of the second planetary carrier 2 is meshed with the planetary gears of the first planetary carrier 1, and similarly, the planetary gears of the second planetary carrier 2 are meshed with the sun gears of the third planetary carrier, and the third planetary carrier is rotationally matched with the gearbox body 200 through the bearing. When the main shaft 100 rotates, it will drive the first planet carrier 1 to rotate. Since the sun gear of the second planet carrier 2 is meshed with the planet gear of the first planet carrier 1, the rotation of the first planet carrier 1 will drive the second planet carrier 2 to rotate; similarly, since the sun gear of the third planet carrier is meshed with the planet gear of the second planet carrier 2, the rotation of the second planet carrier 2 will further drive the third planet carrier to rotate, and finally convert it into output power; it can be understood that since the first planet carrier 1, the second planet carrier 2 and the third planet carrier are all meshed with the inner ring gear of the gear box 200 through the planet gears, the first planet carrier 1, the second planet carrier 2 and the third planet carrier can all rotate smoothly relative to the gear box 200.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Planetary gearbox, characterized in that, The invention comprises a first planet carrier (1), a second planet carrier (2) and a support bearing (3); the first planet carrier (1), the support bearing (3) and the second planet carrier (2) are sequentially arranged in a gear box body (200) along the axial direction of a main shaft (100); the first planet carrier (1) is rotatably matched with the second planet carrier (2) via the support bearing (3).

2. The planetary gearbox according to claim 1, characterized in that: The support bearing (3) is arranged between the first planet carrier (1) and the second planet carrier (2); the outer ring of the support bearing (3) is interference fit with the first planet carrier (1), and the inner ring of the support bearing (3) is interference fit with the second planet carrier (2).

3. The planetary gearbox according to claim 1, characterized in that: The second planet carrier (2) comprises a gear spoke plate (21) for supporting the planetary gear and a support platform (22) arranged on the gear spoke plate (21), and the inner ring of the support bearing (3) is interference-connected to the support platform (22).

4. The planetary gearbox according to claim 3, characterized in that: An abutment groove is provided on the first planet carrier (1) around the outer side of the support platform (22), and the outer ring of the support bearing (3) is clamped in the abutment groove.

5. The planetary gearbox according to claim 4, characterized in that: The abutment groove comprises a first abutment surface (11) and a second abutment surface (12); the first abutment surface (11) abuts against the outer ring of the support bearing (3) along the radial direction of the main shaft (100); and the second abutment surface (12) abuts against the outer ring of the support bearing (3) along the axial direction of the main shaft (100).

6. The planetary gearbox according to claim 5, characterized in that: The support platform (22) has a mounting surface (221) and a docking surface (222), wherein the mounting surface (221) abuts against the inner ring of the support bearing (3) along the radial direction of the main shaft (100), and the docking surface (222) abuts against the inner ring of the support bearing (3) along the axial direction of the main shaft (100).

7. The planetary gearbox according to claim 3, characterized in that: A weight-reducing groove (4) is provided between the supporting platform (22) and the gear spoke plate (21).

8. The planetary gearbox according to claim 7, characterized in that: The thickness of the supporting platform (22) gradually increases in a direction approaching the gear spoke plate (21).

9. The planetary gearbox according to claim 3, characterized in that: The supporting platform (22) is arranged around the gear spoke plate (21).

10. The planetary gearbox according to any one of claims 1 to 9, characterized in that: The support bearing (3) is a tapered bearing.

Images