Wind power gear box
By introducing an elastic element into the wind turbine gearbox to adjust the bearing preload, the problem of bearing slippage under light load was solved, enabling stable operation of the bearing under different working conditions, extending its service life and reducing the risk of friction and abnormal temperature.
Patent Information
- Application Number
- CN202520291927.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-02-24
AI Technical Summary
Wind turbine gearboxes are prone to bearing slippage under light loads, leading to premature failure. Furthermore, at high speeds, increased friction and abnormally high temperatures pose a risk of serious accidents.
Introducing elastic elements into the wind turbine gearbox allows for adjustment of the bearing preload through the expansion and contraction of these elements. This ensures that the bearing maintains appropriate clearance under both light and heavy loads, preventing slippage.
This effectively avoids bearing slippage under different operating conditions, extends bearing service life, reduces the risk of friction and abnormal temperature rise, and ensures stable operation of wind turbine gearboxes.
Smart Images
Figure CN223594917U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to wind power generation equipment technical field especially relates to a wind power gear box. BACKGROUND
[0002] Wind power gear box faces various working conditions, even low load high speed and bad lubrication, bearing will have the risk of skidding damage. Once the bearing skids and damages the raceway surface, the working wind power gear box will have abnormal noise and temperature rise, at this time, if corresponding solving measures are not taken, the bearing operation state is further deteriorated, friction increases, temperature continues to rise, various vicious accidents will occur.
[0003] As shown in Figure 1 In the related art, a pair of bearings 200 and a constant distance ring 300 are sleeved on a high-speed shaft 100 of a wind power gear box, the locating end faces of the outer rings of the two bearings 200 are arranged away from each other and are limited by limiting structures respectively, the constant distance ring 300 is installed between the outer rings of the two bearings 200, and the width of the constant distance ring 300 is adjusted to adjust the rolling element clearance of the bearings 200. As the load increases, the temperature of the bearings 200 rises, and the bearings 200 have no clearance, at this time, pre-tightening force is generated to prevent the bearings 200 from slipping.
[0004] However, when the wind power gear box is running at light load, the bearings 200 on the high-speed shaft 100 are subjected to small load, there is no pre-tightening force between the outer rings of the bearings 200 and the rolling elements, and the rolling elements are prone to slipping during rotation, which affects the normal use of the bearings 200 and further causes early failure of the bearings 200. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a wind power gear box to provide pre-tightening force for bearings and avoid slipping of the bearings.
[0006] To achieve the purpose, the utility model adopts the following technical scheme:
[0007] A wind power gear box comprises a box body, a high-speed shaft, a first bearing, a second bearing and an elastic member, the high-speed shaft is arranged in the box body, the outer rings of the first bearing and the second bearing are fixed to the box body and the inner rings of the first bearing and the second bearing are sleeved on the high-speed shaft, the distance between the second bearing and a generator is smaller than the distance between the first bearing and the generator; the locating 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 shaft shoulder of the high-speed shaft, the other end of the inner ring of the second bearing is locked by locking structure, the elastic member is arranged on the side of the first bearing away from the second bearing, one end of the elastic member abuts against the limiting part of the box body, and the other end of the elastic member abuts against the locating end face of the outer ring of the first bearing.
[0008] In some possible implementation manners, the box is provided with a mounting groove, the limiting portion is a groove bottom of the mounting groove, and the elastic member is arranged in the mounting groove and abuts against the groove bottom of the mounting groove.
[0009] In some possible implementation manners, the elastic member is a coil spring, and the coil spring is sleeved on the high-speed shaft.
[0010] In some possible implementation manners, the locking structure comprises a locking nut, the high-speed shaft is provided with an external thread, the locking nut is threadedly connected with the external thread, and the locking nut is used for locking an inner ring of the second bearing.
[0011] In some possible implementation manners, a distance ring and a positioning ring are further included, the positioning ring is fixed to the box and used for positioning an 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 implementation manners, the first bearing and the second bearing are both tapered roller bearings.
[0013] In some possible implementation manners, a NU type bearing and a third bearing are further included, outer rings of the NU type bearing and the third bearing are both fixed to the box and inner rings of the NU type bearing and the third bearing are both sleeved on the high-speed shaft, a distance of the NU type bearing relative to the generator is less than a distance of the third bearing relative to the generator, and an eccentric amount exists between the third bearing and the high-speed shaft.
[0014] In some possible implementation manners, a first bearing seat and a second bearing seat are further included, the third bearing is fixed to the box through the first bearing seat, the NU type bearing is fixed to the box through the second bearing seat, a center line of an inner hole of the second bearing seat is collinear with an axis of the high-speed shaft, and a center line of an inner hole of the first bearing seat and a center line of an inner hole of the second bearing seat are arranged in parallel and at intervals, so that the eccentric amount exists between the third bearing and the high-speed shaft.
[0015] In some possible implementation manners, the eccentric amount is 1 μm-900 μm.
[0016] In some possible implementation manners, the third bearing is a cylindrical roller bearing or a ball bearing.
[0017] The utility model discloses the beneficial effect:
[0018] The utility model provides a kind of wind power gear box, the inner ring of first bearing is positioned axially by second bearing and locking structure, and elastic member is equipped between the positioning end surface of outer ring and the limiting portion of box, can guarantee wind power gear box whether light load or heavy load, elastic member has telescopic amount to be able to continuously provide pre-tightening force for the outer ring of first bearing, if wind power gear box is in heavy load condition, with the increase of load, first bearing temperature rises, according to thermal expansion and contraction principle, elastic member shortens;If wind power gear box is in light load condition, then elastic member elongates, so that first bearing zero play, guarantee the driving force that rolling element suffers is sufficient, avoid the phenomenon of skidding in rotation process.In addition, when wind power gear box accelerates and decelerates and changes operating direction, rolling element will produce huge impact to retainer, cause retainer to crack, and first bearing zero play slows down the impact of rolling element to retainer. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is the sectional view of part wind power gear box in prior art;
[0020] Figure 2 It is the sectional view of part wind power gear box provided by the specific embodiment of the utility model.
[0021] In the drawing:
[0022] 100, high speed shaft;200, bearing;300, fixed distance ring;
[0023] 1, high speed shaft;11, shaft shoulder;2, first bearing;3, second bearing;4, elastic member;5, locking structure;6, box;61, mounting groove;7, fixed distance ring;8, NU type bearing;9, third bearing;10, positioning ring. DETAILED DESCRIPTION
[0024] To make the technical problem solved by the utility model, the technical scheme adopted and the technical effect reached more clear, the technical scheme of the embodiment of the utility model will be further described in detail below in conjunction with drawings, obviously, the described embodiment is only a part of the embodiment of the utility model, not all embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of protection of the utility model.
[0025] In the description of the utility model, unless another definite provision and limitation, the term "link", "connection", "fix" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's mutual action relation.For the ordinary skill in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model.
[0026] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features is not direct contact but is through the contact between other features between them.And, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the first feature horizontal height is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the first feature horizontal height is less than the second feature.
[0027] As Figure 2 The utility model provides a wind power gear box, including box 6, high speed shaft 1, first bearing 2, second bearing 3 and elastic part 4, high speed shaft 1 is worn in box 6, and the outer ring of first bearing 2 and second bearing 3 are fixed to box 6, and the inner ring is all set up in high speed shaft 1, and the distance of second bearing 3 relative to generator is less than the distance of first bearing 2 relative to generator;The positioning end surface of the inner ring of first bearing 2 and second bearing 3 faces each other and mutually abuts, and the other end of the inner ring of first bearing 2 abuts on the shaft shoulder 11 of high speed shaft 1, and the other end of the inner ring of second bearing 3 is locked through locking structure 5, and elastic part 4 is set up in the side of first bearing 2 away from second bearing 3, and one end of elastic part 4 abuts on the limiting portion of box 6, and the other end abuts on the positioning end surface of the outer ring of 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, and the positioning end face of the outer ring and the limiting part of the box 6 are provided with the elastic member 4, so that the elastic member 4 can continuously provide the pre-tightening force for the outer ring of the first bearing 2 under the condition of heavy load or light load of the wind turbine gearbox. When the wind turbine gearbox is in the condition of heavy load, the temperature of the first bearing 2 rises with the increase of the load, and according to the principle of thermal expansion and contraction, the elastic member 4 is shortened. When the wind turbine gearbox is in the condition of light load, the elastic member 4 is elongated, so that the first bearing 2 has zero play, the driving force of the rolling element is sufficient, and the sliding phenomenon in the rotating process is avoided. In addition, when the wind turbine gearbox accelerates or decelerates and changes the running direction, the rolling element will produce a great impact on the retainer, causing the retainer to crack, and the zero play of the first bearing 2 slows down the impact of the rolling element on the retainer.
[0029] Optionally, the first bearing 2 and the second bearing 3 are both conical roller bearings, which can stably operate under heavy load and impact load, thereby ensuring the stable operation of the wind turbine gearbox. The rolling elements are all conical rollers.
[0030] Optionally, the elastic member 4 is a spiral spring or any other elastic body. In one embodiment, the spiral spring is sleeved on the high-speed shaft 1. The box 6 is provided with a mounting hole, and the outer rings of the first bearing 2 and the second bearing 3 are fixed in the mounting hole. The box 6 is also provided with a mounting groove 61 communicating with the mounting hole, and the limiting part is the groove bottom of the mounting groove 61. The elastic member 4, i.e. the spiral spring, is arranged in the mounting groove 61 and abuts against the groove bottom of the mounting groove 61, thereby ensuring the installation stability of the elastic member 4.
[0031] The locking structure 5 includes a locking nut, and the high-speed shaft 1 is provided with an external thread. The locking nut is threadedly connected with the external thread, and is used for locking the inner ring of the second bearing 3 to prevent axial movement. The structure is reliable and convenient to disassemble and assemble.
[0032] The wind turbine gearbox further comprises a positioning ring 10 fixed on the box 6 and used for positioning the outer ring of the second bearing 3. The wind turbine gearbox further comprises a distance ring 7 arranged between the locking structure 5 and the inner ring of the second bearing 3. The width of the distance ring 7 is matched to adjust the play size of the rolling element of the second bearing 3. With the increase of the load, the temperature of the second bearing 3 rises, and the second bearing 3 has no play. At this time, the pre-tightening force is generated to prevent the second bearing 3 from slipping.
[0033] The wind power gear box further comprises a NU type bearing 8, an outer ring of the NU type bearing 8 is fixed to the box body 6, and an inner ring of the NU type bearing 8 is sleeved on the high-speed shaft 1. Since the load of the wind power gear box frequently changes, according to the principle of thermal expansion and cold contraction, the high-speed shaft 1 will correspondingly expand and contract, and the main function of the NU type bearing 8 is to bear radial load and adapt to axial expansion and contraction, so the NU type bearing 8 can be well applied to the high-speed shaft 1. The wind power gear box further comprises a third bearing 9, an outer ring of the third bearing 9 is fixed to the box body 6, and an inner ring of the third bearing 9 is sleeved on the high-speed shaft 1. The distance of the NU type bearing 8 relative to the generator is less than the distance of the third bearing 9 relative to the generator, that is, the third bearing 9 is added on the blade side of the NU type bearing 8 of the high-speed shaft 1, and when assembled, there is an eccentric amount between the third bearing 9 and the high-speed shaft 1. When the wind power gear box is in a light load condition, the eccentricity will apply a pre-tightening force to the NU type bearing 8, improve the driving force of the rolling element under light load, and avoid abnormal sliding of the rolling element on the raceway during rotation; as the operating load of the wind power gear box increases, the high-speed shaft 1 will be deformed, at this time, the deformation amount of the high-speed shaft 1 compensates the initial eccentric amount, and then the wind power gear box operates normally; the third bearing 9 is a cylindrical roller bearing or a ball bearing.
[0034] The wind power gear box further comprises a first bearing seat and a second bearing seat, the third bearing 9 is fixed to the box body 6 through the first bearing seat, and the NU type bearing 8 is fixed to the box body 6 through the second bearing seat. The center line of the inner hole of the second bearing seat is collinear 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 at intervals, so that there is an eccentric amount between the third bearing 9 and the high-speed shaft 1. That is, through the constraint 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 eccentric amount between the third bearing 9 and the high-speed shaft 1 is simple and reliable in structure, and is convenient for realizing 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 eccentric amount.
[0035] Optionally, the eccentric amount is in microns, which has no influence on 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 parts on the high-speed shaft 1 can be normally assembled. Optionally, the eccentric amount is 1 μm-900 μm, such as 1 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, etc., which is not limited.
[0036] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.
Claims
1. A wind turbine gearbox, characterized in that, The assembly includes a housing (6), a high-speed shaft (1), a first bearing (2), a second bearing (3), and an elastic element (4). The high-speed shaft (1) passes through the housing (6). The outer rings of the first bearing (2) and the second bearing (3) are fixed to the housing (6), and their inner rings are fitted onto the high-speed shaft (1). The distance between the second bearing (3) and the generator is less 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 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 element (4) is located on the side of the first bearing (2) away from the second bearing (3). One end of the elastic element (4) abuts against the limiting part 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 housing (6) has an installation groove (61), the limiting part is the bottom of the installation groove (61), and the elastic member (4) is located in the installation groove (61) and one end abuts against the bottom of the installation groove (61).
3. The wind turbine gearbox according to claim 1, characterized in that, The elastic element (4) is a helical spring, which is sleeved on the high-speed shaft (1).
4. The wind turbine gearbox according to claim 1, characterized in that, 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, 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 spacer ring (7) and a positioning ring (10), the positioning ring (10) being fixed to the housing (6) for positioning the outer ring of the second bearing (3), and the spacer ring (7) being disposed 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, Both the first bearing (2) and the second bearing (3) are tapered roller bearings.
7. The wind turbine gearbox according to any one of claims 1-6, 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 fitted onto the high-speed shaft (1). The distance between the NU type bearing (8) and the generator is less than the distance between the third bearing (9) and the generator. 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 housing and a second bearing housing. The third bearing (9) is fixed to the housing (6) through the first bearing housing. The NU-type bearing (8) is fixed to the housing (6) through the second bearing housing. The center line of the inner hole of the second bearing housing is collinear with the axis of the high-speed shaft (1). The center lines of the inner holes of the first bearing housing and the second bearing housing are parallel and spaced apart to make the third bearing (9) and the high-speed shaft (1) have an eccentricity.
9. The wind turbine gearbox according to claim 7, characterized in that, The eccentricity ranges from 1 μm to 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.