Planetary gearbox

Abstract

The utility model 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] This utility model relates to the field of wind power gearbox technology, and in particular to a planetary gearbox. Background Technology

[0002] In planetary gearboxes commonly used in wind turbines, each planetary carrier is supported by the gearbox housing, meaning the planetary carrier rotates with the gearbox housing via bearings. However, due to the limited support function of the gearbox housing for each planetary carrier, special abutment structures and extended axial length are required to ensure the installation stability of the planetary carriers. However, the complex structure and large size of these gearboxes increase their overall weight, making overall hoisting and installation difficult.

[0003] Therefore, there is an urgent need to design a gearbox to solve the above-mentioned problems in the existing technology. Utility Model Content

[0004] The purpose of this invention is to provide a planetary gearbox that can shorten the axial length of the gearbox body to reduce weight and manufacturing costs.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This utility model provides a planetary gearbox, including a first planetary carrier, a second planetary carrier, and a support bearing. The first planetary carrier, the support bearing, and the second planetary carrier are sequentially arranged in the gearbox body along the axial direction of the main shaft. The first planetary carrier is rotatably engaged with the second planetary carrier through the support bearing.

[0007] Preferably, the support bearing is disposed between the first planetary carrier and the second planetary carrier, the outer ring of the support bearing is interference-fitted with the first planetary carrier, and the inner ring of the support bearing is interference-fitted with the second planetary carrier.

[0008] Preferably, the second planetary carrier includes a gear spoke for supporting the planetary gears and a support platform disposed on the gear spoke, wherein the inner ring of the support bearing is interference-fitted to the support platform.

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

[0010] Preferably, the abutment groove has a first abutment surface and a second abutment surface, the first abutment surface abutting against the outer ring of the support bearing radially along the main shaft, and the second abutment surface abutting against the outer ring of the support bearing axially along the main shaft.

[0011] Preferably, the support platform has a mounting surface and a mating surface, the mounting surface abutting against the inner ring of the support bearing along the radial direction of the main shaft, and the mating surface abutting 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 support platform and the gear spokes.

[0013] Preferably, the thickness of the support platform gradually increases along the direction close to the gear spokes.

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

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

[0016] The beneficial effects of this utility model are as follows:

[0017] The planetary gearbox provided by this utility model includes 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 sequentially along the axial direction of the main shaft, and the first planetary carrier is rotatably engaged with the second planetary carrier through the support bearing, the planetary gearbox can realize normal multi-stage planetary transmission function through the first and second planetary carriers. The first and second planetary carriers of the planetary gearbox are directly rotatably engaged through the support bearing, and there is no need to set a backing structure on the gearbox body to connect with the support bearing. Therefore, the structure of the gearbox body is simplified, and the axial space required for multi-stage planetary carrier arrangement is reduced, the axial length of the gearbox body is shortened, thereby reducing the overall weight of the planetary gearbox and reducing the manufacturing cost of the planetary gearbox. Attached Figure Description

[0018] Figure 1 This is a partial sectional view of the planetary gearbox provided in a specific embodiment of the present utility model;

[0019] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0020] In the picture:

[0021] 100-spindle;

[0022] 200 - Gearbox housing;

[0023] 1-First planetary carrier; 11-First abutment surface; 12-Second abutment surface;

[0024] 2-Second planetary carrier; 21-Gear spokes; 22-Support platform; 221-Mounting surface; 222-Mating surface;

[0025] 3-Support bearing;

[0026] 4-Weight reduction tank. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] like Figure 1 and Figure 2 As shown, this utility model provides a planetary gearbox, which includes 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 the gearbox body 200 along the axial direction of the main shaft 100. The first planet carrier 1 is rotatably engaged with the second planet 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 sequentially along the axial direction of the main shaft 100, and the first planetary carrier 1 is rotatably engaged with the second planetary carrier 2 through the support bearing 3, the planetary gearbox can achieve 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 engaged through the support bearing 3, and there is no need to set abutment structure on the gearbox body 200 to connect with the support bearing 3. Therefore, the structure of the gearbox body 200 is simplified, and the axial space required for the arrangement of multi-stage planetary carriers is reduced, the axial length of the gearbox body 200 is shortened, thereby reducing the overall weight of the planetary gearbox and reducing the manufacturing cost of the planetary gearbox.

[0033] Specifically, such as Figure 1 and Figure 2 As shown, the support bearing 3 is disposed between the first planetary carrier 1 and the second planetary carrier 2. The outer ring of the support bearing 3 is interference-fitted with the first planetary carrier 1, and the inner ring of the support bearing 3 is interference-fitted with the second planetary carrier 2. This ensures the reliability of the connection between the support bearing 3 and the first planetary carrier 1 and the second planetary carrier 2, respectively, and prevents slippage between the first planetary carrier 1 and the outer ring of the support bearing 3, and between the second planetary 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 planetary carrier 2, and the outer ring of the support bearing 3 is integrally formed with the first planetary carrier 1. After the first planetary carrier 1 and the second planetary carrier 2 are assembled, rolling elements are filled between the inner and outer rings to form the support bearing 3, thereby achieving normal rotational engagement between the first planetary carrier 1 and the second planetary carrier 2.

[0034] Furthermore, such as 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 along the axial direction, so that the lubricating oil can flow smoothly into the support bearing 3 radially 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 mesh with the internal gear ring on the gearbox 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 and engage with the gearbox 200.

[0036] like Figure 2As shown, the second planetary carrier 2 includes a gear spoke 21 for supporting the planetary gears and a support platform 22 disposed on the gear spoke 21. The inner ring of the support bearing 3 is interference-fitted to the support platform 22. The support platform 22 protrudes from the gear spoke 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 fitted.

[0037] To facilitate quick positioning and installation of the support bearing 3, and also to improve the stability of the support bearing 3 during operation, such as Figure 2 As shown, the first planetary carrier 1 is provided with an abutment groove, which is arranged around the outside of the support platform 22, and the outer ring of the support bearing 3 is engaged in the abutment groove; it can be understood that the abutment groove is arranged in a ring on the first planetary carrier 1 directly opposite 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 planetary carrier 1 and the second planetary carrier 2 to transfer axial load along the main shaft 100 while rotating together.

[0039] Specifically, such as 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 radially along the main shaft 100, and the second abutment surface 12 abuts against the outer ring of the support bearing 3 axially along 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 circumferentially along the main shaft 100, respectively. When the outer ring of the support bearing 3 is placed in the abutment groove, the outer circumferential surface and end face of the outer ring can abut against the first abutment surface 11 and the second abutment surface 12, respectively, thereby realizing the rapid positioning and installation of the support bearing 3. At the same time, the outer ring of the support bearing 3 can abut against the second abutment surface 12 axially, which can prevent the first planetary carrier 1 and the second planetary carrier 2 from moving relative to each other axially, thereby realizing the effective transmission of the axial load of the main shaft 100.

[0040] Furthermore, such as Figure 2 As shown, the support platform 22 has a mounting surface 221 and a mating surface 222. The mounting surface 221 abuts against the inner ring of the support bearing 3 radially along the main shaft 100, and the mating surface 222 abuts against the inner ring of the support bearing 3 axially along the main shaft 100. Specifically, the mounting surface 221 and the mating surface 222 are perpendicular to each other and extend circumferentially along the main shaft 100. When the inner ring of the support bearing 3 is installed on the support platform 22, the inner circumferential surface and end face of the inner ring can abut against the mounting surface 221 and the mating surface 222 respectively, thereby enabling the support bearing 3 to be quickly installed in place. At the same time, the abutment groove cooperates with the support platform 22, which can effectively transmit axial load along the main shaft 100 and prevent the support bearing 3 from moving axially.

[0041] To further reduce the weight of the planetary gearbox and reduce the amount of materials used, such as Figure 2 As shown, a weight-reducing groove 4 is provided between the support platform 22 and the gear spoke 21. Specifically, the weight-reducing groove 4 is continuously arranged around the gear spoke 21, thereby greatly reducing the weight of the planetary gearbox; in another embodiment, several weight-reducing grooves 4 are intermittently arranged along the circumference of the gear spoke 21, which not only meets the weight reduction requirement of the planetary gearbox, but also ensures the structural strength of the second planetary carrier 2.

[0042] Furthermore, such as Figure 2 As shown, the thickness of the support platform 22 gradually increases along the direction close to the gear spoke 21, making the connection between the support platform 22 and the gear spoke 21 more solid 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 close to the gear spoke 21, the side of the support platform 22 opposite to the mounting surface 221 gradually approaches the axis of the main shaft 100.

[0044] Multiple support platforms 22 can be arranged at intervals along the circumference of the main shaft 100, or a single support platform can be arranged completely around the circumference of the main shaft 100. In this embodiment, the support platform 22 is arranged around the gear spokes 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 amount of material used and the weight of the planetary gearbox while satisfying 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 planet carrier 1 by bolts. The gearbox body 200 is provided with multiple internal gear rings that cooperate with each stage of the planetary transmission mechanism. Multiple planet gears on the first planet carrier 1, the second planet carrier 2, and the third planet carrier respectively mesh with each internal gear ring of the gearbox body 200. The second planet carrier 2 is rotatably engaged with the first planet carrier 1 through a support bearing 3, and the sun gear of the second planet carrier 2 meshes with the planet gears of the first planet carrier 1. Similarly, the planet gears of the second planet carrier 2 mesh with the sun gear of the third planet carrier, and the third planet carrier is rotatably engaged with the gearbox body 200 through a bearing. When the spindle 100 rotates, it drives the first planetary carrier 1 to rotate. Since the sun gear of the second planetary carrier 2 meshes with the planet gears of the first planetary carrier 1, the rotation of the first planetary carrier 1 will drive the second planetary carrier 2 to rotate. Similarly, since the sun gear of the third planetary carrier meshes with the planet gears of the second planetary carrier 2, the rotation of the second planetary carrier 2 will further drive the third planetary carrier to rotate, and finally be converted into output power. It can be understood that since the first planetary carrier 1, the second planetary carrier 2, and the third planetary carrier all mesh with the internal gear ring of the gearbox 200 through planet gears, the first planetary carrier 1, the second planetary carrier 2, and the third planetary carrier can all rotate smoothly relative to the gearbox 200.

[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A planetary gearbox, characterized in that, It 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 the gearbox body (200) along the axial direction of the main shaft (100). The first planetary carrier (1) is rotatably engaged with the second planetary carrier (2) through the support bearing (3).

2. The planetary gearbox according to claim 1, characterized in that, The support bearing (3) is disposed between the first planetary carrier (1) and the second planetary carrier (2). The outer ring of the support bearing (3) is interference-fitted with the first planetary carrier (1), and the inner ring of the support bearing (3) is interference-fitted with the second planetary carrier (2).

3. The planetary gearbox according to claim 1, characterized in that, The second planetary carrier (2) includes a gear spoke (21) for supporting the planetary gears and a support platform (22) disposed on the gear spoke (21), and the inner ring of the support bearing (3) is interference-fitted to the support platform (22).

4. The planetary gearbox according to claim 3, characterized in that, The first planetary carrier (1) has an abutment groove on the outer side of the support platform (22), and the outer ring of the support bearing (3) is engaged in the abutment groove.

5. The planetary gearbox according to claim 4, characterized in that, 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) radially along the main shaft (100), and the second abutment surface (12) abuts against the outer ring of the support bearing (3) axially along 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 mating surface (222). The mounting surface (221) abuts against the inner ring of the support bearing (3) radially along the main shaft (100), and the mating surface (222) abuts against the inner ring of the support bearing (3) axially along the main shaft (100).

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

8. The planetary gearbox according to claim 7, characterized in that, Along the direction close to the gear spokes (21), the thickness of the support platform (22) gradually increases.

9. The planetary gearbox according to claim 3, characterized in that, The support platform (22) is arranged around the gear spokes (21).

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

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