Wind power gear box

Abstract

The invention discloses a wind power gear box, and belongs to the technical field of wind power generation equipment. The wind power gear box comprises a box body, a high-speed shaft, a first bearing, a second bearing and an elastic piece, the high-speed shaft penetrates through the box body, outer rings of the first bearing and the second bearing are fixed to the box body, inner rings of the first bearing and the second bearing are arranged on the high-speed shaft in a sleeving mode, and the distance between the second bearing and the generator is smaller than that between the first bearing and the generator; the positioning end faces of inner rings of the first bearing and the second bearing face each other and abut against each other, the other end of the inner ring of the first bearing abuts against a shaft shoulder of the high-speed shaft, the other end of the inner ring of the second bearing is locked through a locking structure, the elastic piece is arranged on the side, away from the second bearing, of the first bearing, and one end of the elastic piece abuts against a limiting part of the box body. And the other end of the spring abuts against the positioning end face of the outer ring of the first bearing to provide pre-tightening force for the first bearing, so that the slipping phenomenon is avoided.

Description

Technical Field

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

[0002] Wind turbine gearboxes face a variety of working conditions, even low load, high speed and poor lubrication, and the bearings will be at risk of slipping and damage. Once the bearings slip and damage the raceway surface, the working wind turbine gearbox will make abnormal noises and the temperature will rise abnormally. If no corresponding solutions are taken at this time, the bearing operation status will further deteriorate, friction will increase, the temperature will continue to rise, and various serious accidents will occur.

[0003] like Figure 1 As shown, in the related art, two matching bearings 200 and a distance ring 300 are sleeved on the high-speed shaft 100 of the wind turbine gearbox. The positioning end faces of the outer rings of the two bearings 200 are set away from each other and are respectively limited by the limiting structure. The distance ring 300 is installed between the outer rings of the two bearings 200. The rolling element clearance of the bearing 200 is adjusted by matching the width of the distance ring 300. As the load increases, the temperature of the bearing 200 rises, and the bearing 200 has no clearance. At this time, a preload force is generated to prevent the bearing 200 from slipping.

[0004] However, when the wind turbine gearbox is running under light load, the bearing 200 on the high-speed shaft 100 is subjected to a smaller load, and there is no preload force between the outer ring of the bearing 200 and the rolling element. The rolling element is prone to slipping during rotation, which affects the normal use of the bearing 200 and may cause the bearing 200 to fail prematurely. Summary of the invention

[0005] The purpose of the present invention is to provide a wind power gearbox, which provides a preload force for the bearing and prevents the bearing from slipping.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A wind power gearbox comprises a housing, a high-speed shaft, a first bearing, a second bearing and an elastic member, wherein the high-speed shaft is passed through the housing, the outer rings of the first bearing and the second bearing are fixed to the housing and the inner rings are sleeved on the high-speed shaft, and the distance of the second bearing relative to the generator is smaller than the distance of the first bearing relative to the generator; the positioning end faces of the inner rings of the first bearing and the second bearing face each other and abut against each other, the other end of the inner ring of the first bearing abuts against the shoulder of the high-speed shaft, and the other end of the inner ring of the second bearing is locked by a locking structure, and the elastic member is arranged on a side of the first bearing away from the second bearing, one end of the elastic member abuts against the limiting portion of the housing, and the other end abuts against the positioning end face of the outer ring of the first bearing.

[0008] In some possible implementations, the box body is provided with a mounting groove, the limiting portion is the bottom of the mounting groove, and the elastic member is disposed in the mounting groove with one end abutting against the bottom of the mounting groove.

[0009] In some possible implementations, the elastic member is a coil spring, and the coil spring is sleeved on the high-speed shaft.

[0010] In some possible implementations, the locking structure includes a locking nut, the high-speed shaft is provided with an external thread, the locking nut is threadedly connected to the external thread, and the locking nut is used to lock the inner ring of the second bearing.

[0011] In some possible implementations, a distance ring and a positioning ring are further included. The positioning ring is fixed to the housing to position the outer ring of the second bearing, and the distance ring is arranged between the locking structure and the inner ring of the second bearing.

[0012] In some possible implementations, both the first bearing and the second bearing are tapered roller bearings.

[0013] In some possible embodiments, a NU-type bearing and a third bearing are further included, wherein the outer rings of the NU-type bearing and the third bearing are fixed to the housing and the inner rings are sleeved on the high-speed shaft, the distance between the NU-type bearing and the generator is smaller than the distance between the third bearing and the generator, and there is an eccentricity between the third bearing and the high-speed shaft.

[0014] In some possible embodiments, it further includes a first bearing seat and a second bearing seat, the third bearing is fixed to the housing through the first bearing seat, the NU-type bearing is fixed to the housing through the second bearing seat, the center line of the inner hole of the second bearing seat is colinear with the axis of the high-speed shaft, and the center line of the inner hole of the first bearing seat and the center line of the inner hole of the second bearing seat are arranged in parallel and spaced apart so that there is an eccentricity between the third bearing and the high-speed shaft.

[0015] In some possible implementations, the eccentricity is 1 μm-900 μm.

[0016] In some possible implementations, the third bearing is a cylindrical roller bearing or a ball bearing.

[0017] Beneficial effects of the present invention:

[0018] The present invention provides a wind power gearbox, in which the inner ring of the first bearing is axially positioned by the second bearing and the locking structure, and an elastic member is provided between the positioning end face of the outer ring and the limiting part of the box body, which can ensure that the wind power gearbox has a telescopic amount and can continuously provide preload force for the outer ring of the first bearing regardless of whether it is lightly loaded or heavily loaded. For example, when the wind power gearbox is under heavy load, as the load increases, the temperature of the first bearing rises, and according to the principle of thermal expansion and contraction, the elastic member shortens; if the wind power gearbox is under light load, the elastic member stretches, so that the first bearing has zero clearance, ensuring that the driving force on the rolling element is sufficient, and avoiding slipping during rotation. In addition, when the wind power gearbox accelerates and decelerates and changes the direction of operation, the rolling element will have a huge impact on the cage, causing the cage to crack, and the zero clearance of the first bearing reduces the impact of the rolling element on the cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of a part of the wind power gearbox in the prior art;

[0020] Figure 2 It is a cross-sectional view of a portion of a wind turbine gearbox provided in a specific embodiment of the present invention.

[0021] In the figure:

[0022] 100, high-speed shaft; 200, bearing; 300, distance ring;

[0023] 1. High-speed shaft; 11. Shoulder; 2. First bearing; 3. Second bearing; 4. Elastic member; 5. Locking structure; 6. Box body; 61. Mounting groove; 7. Distance ring; 8. NU bearing; 9. Third bearing; 10. Positioning ring. DETAILED DESCRIPTION

[0024] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] 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.

[0026] 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.

[0027] like Figure 2 As shown, this embodiment provides a wind power gearbox, including a housing 6, a high-speed shaft 1, a first bearing 2, a second bearing 3 and an elastic member 4, the high-speed shaft 1 is inserted into the housing 6, the outer rings of the first bearing 2 and the second bearing 3 are both fixed to the housing 6, and the inner rings are both sleeved on the high-speed shaft 1, and the distance of the second bearing 3 relative to the generator is smaller than the distance of the first bearing 2 relative to the generator; the positioning end faces of the inner rings of the first bearing 2 and the second bearing 3 face each other and abut against each other, the other end of the inner ring of the first bearing 2 abuts against the shoulder 11 of the high-speed shaft 1, and the other end of the inner ring of the second bearing 3 is locked by a locking structure 5, and the elastic member 4 is arranged on the side of the first bearing 2 away from the second bearing 3, one end of the elastic member 4 abuts against the limiting portion of the housing 6, and the other end abuts against the positioning end face of the outer ring of the first bearing 2.

[0028] The inner ring of the first bearing 2 is axially positioned by the second bearing 3 and the locking structure 5. An elastic member 4 is provided between the positioning end face of the outer ring and the limiting part of the housing 6, which can ensure that the wind power gearbox has a telescopic amount to continuously provide preload for the outer ring of the first bearing 2 regardless of whether it is lightly loaded or heavily loaded. If the wind power gearbox is under heavy load, as the load increases, the temperature of the first bearing 2 rises, and according to the principle of thermal expansion and contraction, the elastic member 4 shortens; if the wind power gearbox is under light load, the elastic member 4 stretches, so that the first bearing 2 has zero clearance, ensuring that the driving force on the rolling element is sufficient, and avoiding slipping during rotation. In addition, when the wind power gearbox accelerates and decelerates and changes the direction of operation, the rolling element will have a huge impact on the cage, causing the cage to crack. The zero clearance of the first bearing 2 reduces the impact of the rolling element on the cage.

[0029] Optionally, the first bearing 2 and the second bearing 3 are both tapered roller bearings, which can operate stably under heavy loads and impact loads, thereby ensuring the stable operation of the wind power gearbox. Among them, the rolling elements are both tapered rollers.

[0030] Optionally, the elastic member 4 is a coil spring, or any other elastic body. In one embodiment, the coil spring is sleeved on the high-speed shaft 1. The housing 6 is provided with a mounting hole, and the outer rings of the first bearing 2 and the second bearing 3 are both fixed in the mounting hole. The housing 6 is also provided with a mounting groove 61 connected to the mounting hole, and the limiting portion is the bottom of the mounting groove 61. The elastic member 4, i.e., the coil spring, is provided in the mounting groove 61, and one end thereof abuts against the bottom of the mounting groove 61, so as to ensure the installation stability of the elastic member 4.

[0031] The locking structure 5 includes a locking nut. The high-speed shaft 1 is provided with an external thread. The locking nut is threadedly connected to the external thread. The locking nut is used to lock the inner ring of the second bearing 3 to prevent axial movement. The structure is reliable and easy to disassemble and assemble.

[0032] The wind turbine gearbox also includes a positioning ring 10, which is fixed to the housing 6 and used to position the outer ring of the second bearing 3. The wind turbine gearbox also includes a distance ring 7, which is arranged between the locking structure 5 and the inner ring of the second bearing 3. The clearance of the rolling element of the second bearing 3 is adjusted by grinding the width of the distance ring 7. As the load increases, the temperature of the second bearing 3 rises, and the second bearing 3 has no clearance. At this time, a preload force is generated to prevent the second bearing 3 from slipping.

[0033] The wind power gearbox also includes a NU-type bearing 8, the outer ring of which is fixed to the housing 6, and the inner ring is sleeved on the high-speed shaft 1. Since the load of the wind power gearbox changes frequently, according to the principle of thermal expansion and contraction, the high-speed shaft 1 will expand and contract accordingly, and the main function of the NU-type bearing 8 is to bear radial loads and adapt to axial expansion and contraction, so it can be well applied to the high-speed shaft 1. The wind power gearbox also includes a third bearing 9, the outer ring of the third bearing 9 is fixed to the housing 6, and the inner ring is sleeved on the high-speed shaft 1. The distance between the NU-type bearing 8 and the generator is smaller than the distance between the third bearing 9 and the generator, that is, the third bearing 9 is added to the blade side of the NU-type bearing 8 of the high-speed shaft 1. During assembly, there is an eccentricity between the third bearing 9 and the high-speed shaft 1. When the wind turbine gearbox is under light load, the eccentricity will apply preload to the NU-type bearing 8, thereby increasing the driving force of the rolling element when under light load, so as to avoid abnormal sliding of the rolling element on the raceway during rotation; as the load of the wind turbine gearbox increases, the high-speed shaft 1 will be deformed by the force, and the deformation of the high-speed shaft 1 will compensate for the initial eccentricity, so that the wind turbine gearbox can operate normally; the third bearing 9 is a cylindrical roller bearing or a ball bearing.

[0034] The wind power gearbox also includes a first bearing seat and a second bearing seat. The third bearing 9 is fixed to the housing 6 through the first bearing seat, and the NU-type bearing 8 is fixed to the housing 6 through the second bearing seat. The center line of the inner hole of the second bearing seat is colinear with the axis of the high-speed shaft 1. The center line of the inner hole of the first bearing seat and the center line of the inner hole of the second bearing seat are arranged in parallel and spaced apart so that there is an eccentricity between the third bearing 9 and the high-speed shaft 1, that is, through the constraints of the first bearing seat and the second bearing seat, the NU-type bearing 8 and the high-speed shaft 1 are normally installed, and the eccentricity between the third bearing 9 and the high-speed shaft 1 is simple and reliable in structure, which is convenient for eccentric installation. According to actual needs, the center distance between the center line of the inner hole of the first bearing seat and the axis of the high-speed shaft 1 is adjusted to adjust the size of the eccentricity.

[0035] Optionally, the eccentricity is in the micron level, which will not affect the installation of other bearings or other parts on the high-speed shaft 1, that is, the high-speed shaft 1 and the bearings and other components on the high-speed shaft 1 can be assembled conventionally. Optionally, the eccentricity is 1μm-900μm, such as 1μm, 100μm, 200μm, 300μm, 400μm, 500μm, 600μm, 700μm, 800μm, 900μm, etc., without limitation.

[0036] 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, other different forms of changes or modifications can be made based on the above description. 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. A wind power gearbox, characterized in that: The invention comprises a housing (6), a high-speed shaft (1), a first bearing (2), a second bearing (3) and an elastic member (4); the high-speed shaft (1) is inserted into the housing (6); the outer rings of the first bearing (2) and the second bearing (3) are both fixed to the housing (6) and the inner rings are both sleeved on the high-speed shaft (1); the distance between the second bearing (3) and the generator is smaller than the distance between the first bearing (2) and the generator; the positioning end faces of the inner rings of the first bearing (2) and the second bearing (3) face each other and abut against each other; the other end of the inner ring of the first bearing (2) abuts against the shaft shoulder (11) of the high-speed shaft (1); the other end of the inner ring of the second bearing (3) is locked by a locking structure (5); the elastic member (4) is arranged on a side of the first bearing (2) away from the second bearing (3); one end of the elastic member (4) abuts against the limiting portion of the housing (6) and the other end abuts against the positioning end face of the outer ring of the first bearing (2).

2. The wind turbine gearbox according to claim 1, characterized in that: The box body (6) is provided with a mounting groove (61), the limiting portion is the groove bottom of the mounting groove (61), and the elastic member (4) is arranged in the mounting groove (61) with one end abutting against the groove bottom of the mounting groove (61).

3. The wind turbine gearbox according to claim 1, characterized in that: The elastic member (4) is a coil spring, and the coil spring is sleeved on the high-speed shaft (1).

4. The wind turbine gearbox according to claim 1, characterized in that: The locking structure (5) comprises a locking nut, the high-speed shaft (1) is provided with an external thread, the locking nut is threadedly connected to the external thread, and the locking nut is used to lock the inner ring of the second bearing (3).

5. The wind turbine gearbox according to claim 1, characterized in that: It also includes a distance ring (7) and a positioning ring (10), wherein the positioning ring (10) is fixed to the housing (6) for positioning the outer ring of the second bearing (3), and the distance ring (7) is arranged between the locking structure (5) and the inner ring of the second bearing (3).

6. The wind turbine gearbox according to claim 1, characterized in that: The first bearing (2) and the second bearing (3) are both tapered roller bearings.

7. The wind turbine gearbox according to any one of claims 1 to 6, characterized in that: It also includes a NU-type bearing (8) and a third bearing (9), the outer rings of the NU-type bearing (8) and the third bearing (9) are fixed to the housing (6), and the inner rings are sleeved on the high-speed shaft (1), the distance between the NU-type bearing (8) and the generator is smaller than the distance between the third bearing (9) and the generator, and there is an eccentricity between the third bearing (9) and the high-speed shaft (1).

8. The wind turbine gearbox according to claim 7, characterized in that: It also includes a first bearing seat and a second bearing seat, the third bearing (9) is fixed to the housing (6) through the first bearing seat, the NU-type bearing (8) is fixed to the housing (6) through the second bearing seat, the inner hole center line of the second bearing seat is colinear with the axis of the high-speed shaft (1), and the inner hole center line of the first bearing seat and the inner hole center line of the second bearing seat are arranged in parallel and spaced apart so that there is an eccentricity between the third bearing (9) and the high-speed shaft (1).

9. The wind turbine gearbox according to claim 7, characterized in that: The eccentricity is 1 μm-900 μm.

10. The wind turbine gearbox according to claim 7, characterized in that: The third bearing (9) is a cylindrical roller bearing or a ball bearing.

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