Bearing and wind generating set

Abstract

The utility model relates to a bearing and a wind generating set, the bearing comprises a bearing body and a rolling body, the bearing body comprises an inner ring and an outer ring arranged around the inner ring, and the inner ring and the outer ring are enclosed to form an annular raceway; the rolling bodies are arranged on the annular raceway, and the inner ring and the outer ring are in running fit through the rolling bodies; wherein at least one of the inner ring and the outer ring comprises more than two stacked ring bodies in the axial direction of the bearing body, one of the two adjacent ring bodies comprises a first butt joint surface, the other one of the two adjacent ring bodies comprises a second butt joint surface, the first butt joint surface comprises a first port and a second port which are distributed at intervals in the axial direction, and the first port and the second port are communicated with each other from the first port to the second port. The radial size of the first butt joint face tends to be increased, and the second butt joint face and the first butt joint face are matched in shape and attached to each other. According to the scheme, the bearing can better bear the radial load, the sliding of the parting surface of the bearing ring body in the radial direction is reduced, and the overall safety and stability of the bearing are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to wind power generation technical field especially is a kind of bearing and wind generating set. BACKGROUND

[0002] In recent years, with the increasing of impeller diameter and unit power, three-row cylindrical variable-pitch bearing has been widely used in wind generating set, but the application experience is less.

[0003] At present, there are cases of connection bolt fracture of three-row cylindrical variable-pitch bearing, which is mainly because the friction coefficient of variable-pitch bearing parting surface is low, causing large ring body slip at parting surface, reducing the pretightening force of connecting bolt and increasing the alternating stress of bolt, finally reducing the fatigue life of bolt, and the bolt fracture within design life occurs. SUMMARY

[0004] The utility model embodiment provides a kind of bearing and wind generating set, can make bearing better withstand radial load, reduce the slip of bearing ring body in radial direction of parting surface, improve the safety and stability of whole bearing.

[0005] In one aspect, according to the utility model embodiment, a bearing is provided, comprising a bearing body and rolling elements, the bearing body comprises an inner ring and an outer ring arranged around the inner ring, and the inner ring and the outer ring enclose an annular raceway; the rolling elements are arranged in the annular raceway, and the inner ring and the outer ring are rotationally connected by the rolling elements; wherein, along the axial direction of the bearing body, at least one of the inner ring and the outer ring comprises two or more annular bodies stacked, one of the adjacent two annular bodies comprises a first abutting surface and the other comprises a second abutting surface, the first abutting surface is an annular surface arranged around the axis of the bearing body, along the axial direction, the first abutting surface comprises a first port and a second port spaced apart, from the first port to the second port, the radial dimension of the first abutting surface increases, and the second abutting surface is matched with the shape of the first abutting surface and is arranged to adhere to each other.

[0006] According to one aspect of the utility model embodiment, from the first port to the second port, the radial dimension of the first abutting surface gradually increases, and the first abutting surface is a conical surface.

[0007] According to one aspect of the utility model embodiment, the included angle between the generatrix of the conical surface and the reference surface is 5°-15°, and the reference surface is a surface perpendicular to the axial direction.

[0008] According to an aspect of the embodiment of the utility model, one of the two adjacent ring bodies is provided with a limiting protrusion and the other is provided with a limiting clamping groove, the shape of the limiting protrusion matches the shape of the limiting clamping groove and is clamped in the limiting clamping groove.

[0009] According to an aspect of the embodiment of the utility model, the limiting protrusion is arranged on one of the first abutting surface and the second abutting surface and protrudes in the axial direction, and the limiting clamping groove is arranged on the other of the first abutting surface and the second abutting surface and is recessed in the axial direction.

[0010] According to an aspect of the embodiment of the utility model, a plurality of annular raceways distributed in the axial direction are formed between the inner ring and the outer ring, and each annular raceway is provided with a rolling body, and the first abutting surface is located between two adjacent annular raceways in the axial direction.

[0011] According to an aspect of the embodiment of the utility model, the plurality of annular raceways include a first annular raceway, a second annular raceway and a third annular raceway arranged in sequence and spaced apart in the axial direction, the second annular raceway is located between the first annular raceway and the third annular raceway, and the first abutting surface is located between the second annular raceway and the third annular raceway in the axial direction.

[0012] According to an aspect of the embodiment of the utility model, a plurality of first connecting holes are arranged on the inner ring in the circumferential direction of the bearing body, a plurality of second connecting holes are arranged on the outer ring, and the bearing body is connected with the blade through the first connecting hole and connected with the hub through the second connecting hole.

[0013] According to an aspect of the embodiment of the utility model, the outer ring includes two or more ring bodies stacked, one of the two adjacent ring bodies includes the first abutting surface and the other includes the second abutting surface.

[0014] Each ring body is provided with a through hole extending in the axial direction and penetrating the first abutting surface and the second abutting surface, and the adjacent ring bodies are abutted through the through holes on the first abutting surface and the second abutting surface to form the second connecting hole.

[0015] In another aspect, the utility model provides a wind turbine generator, which includes a variable pitch system and a yaw system, at least one of the variable pitch system and the yaw system includes the bearing.

[0016] According to an aspect of the embodiment of the utility model, the variable pitch system includes a hub, a blade and the bearing, one of the inner ring and the outer ring is connected with the hub, and the other is connected with the blade.

[0017] The utility model embodiment provides a kind of bearing and wind turbine generator unit, the ring body in the inner ring or outer ring of bearing body is docked using first butt joint surface and second butt joint surface, the radial dimension of first port and second port of first butt joint surface is differentially designed, so that the annular surface structure of first butt joint surface is the structure of size gradient, that is, first butt joint surface and second butt joint surface are set to mutually matched conical surface structure, when the bearing accepts radial load, the conical surface of first butt joint surface and second butt joint surface can buffer the radial slip between ring body, reduce the risk of dislocation movement between adjacent ring body, to improve the structural strength of the inner ring or outer ring of bearing body itself, so that bearing whole has better structural stability, prolongs the service life of bearing. BRIEF DESCRIPTION OF DRAWINGS

[0018] The features, advantages, and technical effects of the exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.

[0019] Figure 1 It is a structure schematic view of the bearing of the utility model embodiment;

[0020] Figure 2 It is another structure schematic view of the bearing of the utility model embodiment;

[0021] Figure 3 It is Figure 1 Partial enlarged schematic view in it.

[0022] Reference signs:

[0023] 10-bearing body;11-inner ring;12-outer ring;12a-ring body;

[0024] 13-annular raceway;14-first butt joint surface;15-second butt joint surface;16-limit protrusion;17-limit slot;18-first connecting hole;19-second connecting hole;1-first port;2-second port;

[0025] 20-rolling element;Z-axial direction;13a-first annular raceway;13b-second annular raceway;13c-third annular raceway.

[0026] In the drawings, the same components use the same reference signs.The drawing is not drawn according to actual proportion. DETAILED DESCRIPTION

[0027] The features and exemplary embodiments of each aspect of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely illustrative of the present application and is not intended to limit the present application as described in the claims. In the drawings and description below, well-known structures and techniques have not been shown or described in detail in order to avoid unnecessarily obscuring the present application.

[0028] The orientation words appearing in the following description are the directions shown in the drawings, and do not limit the specific structure of the bearing and the wind turbine generator set of the present application. In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting" and "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In the field of wind power generation technology, in order to realize the variable pitch requirement of the blade on the hub, it is usually necessary to set a variable pitch bearing between the hub and the blade, connect the rotating ring of the variable pitch bearing with the blade and connect the fixed ring with the hub, so as to realize the rotation adjustment of the blade relative to the hub, so as to achieve the variable pitch requirement of the blade.

[0030] When the blade bears gravity, aerodynamic load and torque load, the bearing rotating ring connected therewith will bear corresponding force and bending moment, and the load will be transmitted to the bearing fixed ring through the rolling body in the bearing. Since the fixed ring of the bearing is usually arranged in the form of two ring bodies stacked, a parting surface is formed between the two ring bodies. When the fixed ring as a whole bears radial load, the two ring bodies will slip at the parting surface, so that relative movement is formed between the two ring bodies, which is easy to form long-time shearing force on the bolts connected between the two ring bodies, causing the decrease of the bolt pre-tightening force and the increase of the alternating stress borne by the bolts, finally reducing the fatigue life of the bolts and causing the bolts to break within the designed life.

[0031] If the broken connecting bolt of the variable pitch bearing described above is not discovered in time, it may cause the variable pitch bearing to fail, and even the blade to fall, causing great danger and economic loss. Based on the above problems, the present application proposes a new bearing structure, which can better bear radial load, reduce the slip of the parting surface of the bearing ring in the radial direction, and improve the safety and stability of the bearing as a whole.

[0032] In order to better understand the utility model, the following will be combined with Figures 1 to 3 The bearing and the wind turbine generator set of the embodiment of the utility model are described in detail.

[0033] Please refer to Figure 1 According to the embodiment of the utility model, a bearing is provided, which comprises a bearing body 10 and a rolling body 20, the bearing body 10 comprises an inner ring 11 and an outer ring 12 arranged around the inner ring 11, and the inner ring 11 and the outer ring 12 are enclosed to form an annular raceway 13; the rolling body 20 is arranged in the annular raceway 13, and the inner ring 11 and the outer ring 12 are rotationally matched through the rolling body 20; wherein, along the axial direction Z of the bearing body 10, at least one of the inner ring 11 and the outer ring 12 comprises two or more annular bodies 12a arranged in layers, one of the two adjacent annular bodies 12a comprises a first butt joint surface 14 and the other comprises a second butt joint surface 15, the first butt joint surface 14 is an annular surface arranged around the axis of the bearing body 10, along the axial direction Z, the first butt joint surface 14 comprises first ports 1 and second ports 2 distributed at intervals, from the first port 1 to the second port 2, the radial dimension of the first butt joint surface 14 shows an increasing trend, and the second butt joint surface 15 is matched in shape with the first butt joint surface 14 and is arranged in close contact with each other.

[0034] Optionally, the bearing in the application can be a variable pitch bearing applied in the field of wind power generation technology, or can be a bearing applied in other technical fields, and the application does not limit this.

[0035] The bearing body 10 has the rotationally matched inner ring 11 and outer ring 12, optionally, the inner ring 11 can be arranged as a rotating ring, and the outer ring 12 can be arranged as a fixed ring, in the variable pitch bearing in the field of wind power generation technology, the inner ring 11 is connected with the blade, and the outer ring 12 is connected with the hub, and the application is illustrated by taking this as an example.

[0036] Optionally, the annular raceway 13 is arranged between the inner ring 11 and the outer ring 12 for accommodating the rolling body 20, and the annular raceway 13 is provided with lubricating grease, thereby facilitating the relative rotation of the inner ring 11 and the outer ring 12 by means of the rolling body 20 to complete the variable pitch process of the wind turbine generator set.

[0037] The specific type of the bearing can be determined according to the specific number, type or structure of the rolling body 20, for example, the bearing can be selected as a three-row cylindrical roller bearing, and the application is illustrated by taking this bearing as an example, but is not limited thereto.

[0038] To facilitate assembly and disassembly of the bearing, the inner ring 11 or outer ring 12 of the bearing is typically configured as a stacked ring 12a structure. As shown in the figure, in this embodiment, the outer ring 12 of the bearing is configured as two stacked rings 12a. By disassembling and separating the two rings 12a, replacement and maintenance of the internal rolling elements 20 are facilitated. Of course, the inner ring 11 of the bearing can also be configured as a stacked structure of two rings 12a, depending on actual needs. This application does not impose any special restrictions on the location and number of the rings 12a.

[0039] It can be seen that the two adjacent ring bodies 12a are abutted against each other through their respective first docking surfaces 14 and second docking surfaces 15. In this embodiment, the structures of the two docking surfaces are improved to form two annular surfaces around the axis, wherein the first docking surface 14 has a first port 1 and a second port 2 in the axial direction Z, and the two ports have different radial dimensions. For example, the first docking surface 14 can form a conical surface structure.

[0040] It can be understood that in order to form a highly matched connection between the upper and lower ring bodies 12a, the second docking surface 15 is adaptively improved so that the first docking surface 14 and the second docking surface 15 can be seamlessly fitted together, so that the cross-section of the two ring bodies 12a at the docking position forms an inclined surface, which is different from the plane in the prior art. The inclined surface can provide additional radial resistance when the two ring bodies 12a are subjected to radial loads, limit the radial movement of the two, and thus reduce the risk of misalignment of the two ring bodies 12a.

[0041] An embodiment of the present utility model provides a bearing, which connects the ring body 12a in the inner ring 11 or the outer ring 12 of the bearing body 10 by using the first docking surface 14 and the second docking surface 15, and differentiates the radial dimensions of the first port 1 and the second port 2 of the first docking surface 14, so that the annular surface structure of the first docking surface 14 is a structure with gradually changing dimensions, that is, the first docking surface 14 and the second docking surface 15 are set to mutually matching conical surface structures. When the bearing is subjected to radial load, the conical surfaces of the first docking surface 14 and the second docking surface 15 can buffer the radial slip between the ring bodies 12a, reducing the risk of misalignment and movement between adjacent ring bodies 12a, thereby improving the structural strength of the inner ring 11 or the outer ring 12 of the bearing body 10 itself, so that the overall bearing has better structural stability and extends the service life of the bearing.

[0042] As an alternative embodiment, see Figure 1 From the first port 1 to the second port 2 , the radial dimension of the first docking surface 14 gradually increases, and the first docking surface 14 is a conical surface.

[0043] Optionally, the first abutting surface 14 is a conical surface in the embodiment, and the radial dimension of the first abutting surface 14 increases in the direction from the first port 1 to the second port 2, so that the first abutting surface 14 forms an inner taper surface, and the second abutting surface 15 corresponding to the first abutting surface 14 is an outer taper surface, thereby realizing the connection between the two ring bodies 12a.

[0044] For the taper surface, it refers to a curved surface formed by moving a moving straight line through a fixed point along a certain curve, wherein the moving straight line is the generatrix of the taper surface, and the curve is the directrix of the taper surface, so it can be known that the generatrix of the first abutting surface 14 in the embodiment is an inclined line forming a predetermined angle with the horizontal line.

[0045] The second abutting surface 15 corresponding to the first abutting surface 14 is also a conical surface, and the generatrix of the second abutting surface 15 has the same inclination angle, so that the second abutting surface 15 can be smoothly connected with the first abutting surface 14.

[0046] The first abutting surface 14 and the second abutting surface 15 are conical surfaces in the embodiment, so that the structure is simple and the connection is convenient, the process forming of the structure is facilitated on the basis of improving the radial stability, and the precision requirement of the structure connection is met.

[0047] As an optional embodiment, please refer to Figure 1 and Figure 2 , the angle between the generatrix of the conical surface and the reference surface is 5°-15°, and the reference surface is a surface perpendicular to the axial direction Z.

[0048] Optionally, the reference surface is a horizontal surface, and the generatrix of the conical surface is an inclined line compared with the horizontal surface, and the angle between the two can be 5°-15°, so that the conical surface structure of the first abutting surface 14 and the second abutting surface 15 can be determined.

[0049] Compared with the horizontal surface, the generatrix of the conical surface can form an angle of 5°-15° clockwise, or an angle of 5°-15° counterclockwise, and the conical surface extensions of the first abutting surface 14 and the second abutting surface 15 in the two cases are opposite, but both can form complementary taper surface structures, and also can play a limiting role on the ring body 12a in the radial direction.

[0050] The embodiment of the utility model provides a bearing, by limiting the angle range between the generatrix of the conical surface and the reference surface, when the conical surface is used to limit the load of the ring body 12a in the radial direction, the stability of the abutment between the two ring bodies 12a can also be ensured, and the strength of the overall bearing structure is further improved.

[0051] As an optional embodiment, please refer to Figure 1 and Figure 3 One of the two adjacent ring bodies 12a is provided with a limiting protrusion 16, and the other is provided with a limiting slot 17. The shape of the limiting protrusion 16 matches the shape of the limiting slot 17 and is matched and arranged in the limiting slot 17.

[0052] In order to further improve the stability of the abutment between the adjacent ring bodies 12a in this embodiment, while the radial movement is limited by the conical surface of the first abutment surface 14 and the second abutment surface 15, the limiting protrusion 16 and the limiting slot 17 are arranged in the two ring bodies 12a.

[0053] It can be understood that the shape and structure of the limiting protrusion 16 and the limiting slot 17 need to be matched, so as to ensure the smooth insertion of the adjacent ring bodies 12a. In order to ensure the structural strength of the ring body 12a itself, the size of the limiting protrusion 16 and the limiting slot 17 can not be enlarged.

[0054] The utility model embodiment provides a kind of bearing, by the structure form of limiting protrusion 16 and limiting slot 17 insertion between adjacent ring bodies 12a, further improve the stability of connection between ring body 12a, on the basis of limiting the radial slip of ring body 12a, so that bearing has higher structural strength.

[0055] As an optional embodiment, the limiting protrusion 16 is protruded from the ring body 12a along the axial direction Z from one of the first abutment surface 14 and the second abutment surface 15, and the limiting slot 17 is recessed from the other of the first abutment surface 14 and the second abutment surface 15 along the axial direction Z.

[0056] Optionally, the limiting protrusion 16 and the limiting slot 17 can be arranged at the first abutment surface 14 and the second abutment surface 15. In order to facilitate the abutment of the two, the limiting protrusion 16 can be protruded along the axial direction Z, and the limiting slot 17 can be recessed along the axial direction Z, so that the ring body 12a can be inserted along the axial direction Z.

[0057] Therefore, when the adjacent ring bodies 12a are abutted, the movement of the ring body 12a in the radial direction is limited by the first abutment surface 14 and the second abutment surface 15, and the relative movement between the ring bodies 12a is further limited by the insertion of the limiting slot 17 and the limiting protrusion 16.

[0058] The utility model embodiment provides a kind of bearing, by being provided with limiting protrusion 16 and limiting clamping groove 17 at the position of first butt joint surface 14 and second butt joint surface 15, it is further improved on the basis of not influencing the abutment of adjacent ring body 12a, the limitation ability of ring body 12a in radial direction is improved, reliable guarantee is provided for reducing the risk of sliding of ring body 12a.

[0059] As an optional embodiment, please refer to Figure 1 A plurality of annular raceways 13 distributed along the axial direction Z are enclosed between the inner ring 11 and the outer ring 12, and a rolling element 20 is arranged in each annular raceway 13. The first butt joint surface 14 is located between two adjacent annular raceways 13 along the axial direction Z.

[0060] Optionally, a plurality of annular raceways 13 are arranged between the inner ring 11 and the outer ring 12 in the embodiment, and a plurality of rolling elements 20 are arranged in the annular raceways 13 to realize the rolling connection of the inner ring 11 and the outer ring 12. The number and structure of the rolling elements 20 arranged between the inner ring 11 and the outer ring 12 are not specially limited in the application.

[0061] When the outer ring 12 is arranged in a stacked manner with two ring bodies 12a, the abutment positions of the first butt joint surface 14 and the second butt joint surface 15 can be located between two annular raceways 13 along the axial direction Z. The specific positions can be determined according to actual design. Specifically, the positions of the first port 1 and the second port 2 of the first butt joint surface 14 are arranged between two annular raceways 13, so as to ensure the structural stability of the divided ring body 12a.

[0062] The utility model embodiment provides a kind of bearing, by the abutment position of first butt joint surface 14 and second butt joint surface 15 is arranged between two annular raceways 13, it is also possible to make two ring bodies 12a have better abutment balance stability while providing radial resistance by the above conical surface, meet the strength requirement of outer ring 12 connection.

[0063] As an optional embodiment, the plurality of annular raceways 13 include a first annular raceway 13a, a second annular raceway 13b and a third annular raceway 13c arranged in sequence and spaced apart along the axial direction Z. The second annular raceway 13b is located between the first annular raceway 13a and the third annular raceway 13c. The first butt joint surface 14 is located between the second annular raceway 13b and the third annular raceway 13c along the axial direction Z.

[0064] Optionally, three annular raceways 13 are arranged between the inner ring 11 and the outer ring 12 in the embodiment, i.e., a first annular raceway 13a, a second annular raceway 13b and a third annular raceway 13c are arranged between the inner ring 11 and the outer ring 12. A rolling element 20 is arranged in each annular raceway 13, so as to form a three-row cylindrical roller bearing.

[0065] For the specific position of the first abutting surface 14, in the embodiment, it can be arranged between the lower second annular raceway 13b and the third annular raceway 13c, and the purpose is mainly to consider the influence of the positions of the first abutting surface 14 and the second abutting surface 15 on the connecting bolts on the outer ring 12, and the connecting bolts are arranged between the second annular raceway 13b and the third annular raceway 13c, so that the shear stress of the connecting bolts can be reduced, the stress requirement of the bolts can be met, and the service life of the connecting bolts is prolonged. The specific abutting position of the first abutting surface 14 and the second abutting surface 15 is not specially limited in the application, and needs to be determined according to actual stress calculation, and the first abutting surface 14 and the second abutting surface 15 can be located between the second annular raceway 13b and the third annular raceway 13c.

[0066] The embodiment of the utility model provides a kind of bearing, by first abutting surface 14 is arranged between second annular raceway 13b and third annular raceway 13c, ensure that its first port 1 and second port 2 are located between the two, on the basis of realizing the radial resistance force provided to adjacent ring body 12a, it can also reduce the load of connecting bolt, meet the design requirement of connecting bolt, form better safety protection to it.

[0067] As an optional embodiment, please refer to Figure 1 , a plurality of first connecting holes 18 are arranged on the inner ring 11 along the circumference of the bearing body 10, and a plurality of second connecting holes 19 are arranged on the outer ring 12, and the bearing body 10 is connected with the blade through the first connecting hole 18 and connected with the hub through the second connecting hole 19.

[0068] Optionally, in the embodiment, the first connecting hole 18 on the inner ring 11 is connected with the blade, and the second connecting hole 19 on the outer ring 12 is connected with the hub, so that the bearing is a variable pitch bearing in a wind turbine generator set, the inner ring 11 is a rotating ring, and the outer ring 12 is a fixed ring.

[0069] For the connection at the first connecting hole 18 and the second connecting hole 19, high-strength bolts can be used to connect the blade and the hub, so as to facilitate the absorption of torque and load caused by the variable pitch rotation of the blade, and have better pressure-bearing capacity.

[0070] Optionally, the outer ring 12 includes two or more stacked ring bodies 12a, one of the two adjacent ring bodies 12a includes the first abutting surface 14, and the other includes the second abutting surface 15, that is, the fixed ring is arranged in the form of abutting structure of two ring bodies 12a, and the radial resistance of the ring body 12a is realized through the first abutting surface 14 and the second abutting surface 15.

[0071] The utility model embodiment provides a kind of bearing, by setting outer ring 12 as two butt joint ring body 12a, on the basis of being convenient to realize the disassembly of internal rolling body 20 by detachable mode, it is the disassembly of fixed ring, compared with the detachable of rotating ring, the split design of fixed ring has better structural stability, it is favorable to further reduce the load and torque brought by blade.

[0072] As an optional embodiment, each ring body 12a is provided with a through hole extending in the axial direction Z and penetrating the first and second butt surfaces 14 and 15, and the adjacent ring bodies 12a are butted through the through holes on the first and second butt surfaces 14 and 15 to form the second connecting hole 19.

[0073] Since the outer ring 12 is arranged as the ring body 12a structure stacked in layers in the embodiment, for the second connecting hole 19 on the outer ring 12, the butting in the axial direction Z needs to be realized through the through holes on the respective ring bodies 12a, so as to form the complete second connecting hole 19 structure.

[0074] At the butting position of the first and second butt surfaces 14 and 15, the ring body 12a is provided with a through hole penetrating the butt surface, and when the first and second butt surfaces 14 and 15 are conical surfaces, the butting of the two ring bodies 12a in the axial direction Z needs to be ensured on the basis of the butting of the two, and finally the high-strength bolt is inserted into the second connecting hole 19 to realize the fixed connection of the outer ring 12.

[0075] After the above butting is formed, when the blade rotates, the relative radial sliding at the positions of the first and second butt surfaces 14 and 15 is formed, and the continuous shear force on the bolt is formed, at which time the radial sliding can be limited through the conical surface structure of the first and second butt surfaces 14 and 15, the reverse radial blocking force is provided, and the stability of the connection of the ring body 12a is ensured.

[0076] The utility model embodiment provides a kind of bearing, by being provided with through hole on respective ring body 12a and completing butting in the axial direction Z to form second connecting hole 19, while completing butting using first and second butt surfaces 14 and 15, the integrity and effectiveness of second connecting hole 19 can also be ensured using through hole butting, without affecting the overall structure of second connecting hole 19, which provides reliable guarantee for subsequent bolt fastening.

[0077] According to the utility model embodiment, a wind turbine generator is provided, which includes a variable pitch system and a yaw system, and at least one of the variable pitch system and the yaw system includes the bearing as described above.

[0078] Optionally, the variable pitch system comprises a hub, a blade and the bearing as described above, one of the inner ring 11 and the outer ring 12 is connected with the hub, and the other is connected with the blade, so as to realize the rotational connection between the blade and the hub.

[0079] The utility model embodiment provides a kind of bearing and wind turbine generator unit, the ring body in the inner ring or outer ring of bearing body is docked using first butt joint surface and second butt joint surface, the radial dimension of the first port and second port of first butt joint surface is differentially designed, so that the annular surface structure of first butt joint surface is the structure of size gradient, that is, first butt joint surface and second butt joint surface are set to mutually matched conical surface structure, when the bearing accepts radial load, the conical surface of first butt joint surface and second butt joint surface can buffer the radial slip between ring body, reduce the risk that dislocation moves between adjacent ring body, to improve the structural strength of the inner ring or outer ring of bearing body itself, so that bearing whole has better structural stability, prolongs the service life of bearing.

[0080] Although the utility model has been described with reference to the preferred embodiments, various modifications can be made to it and parts thereof can be replaced with equivalents without departing from the scope of the utility model. In particular, each of the technical features mentioned in each of the embodiments can be combined in any manner as long as there is no structural conflict. The utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A bearing, characterized in that: include: A bearing body (10) comprises an inner ring (11) and an outer ring (12) arranged around the inner ring (11), wherein the inner ring (11) and the outer ring (12) enclose an annular raceway (13); A rolling body (20) is provided on the annular raceway (13), and the inner ring (11) and the outer ring (12) are rotationally engaged via the rolling body (20); Wherein, along the axial direction (Z) of the bearing body (10), at least one of the inner ring (11) and the outer ring (12) includes two or more stacked ring bodies (12a), one of the two adjacent ring bodies (12a) includes a first docking surface (14) and the other includes a second docking surface (15), the first docking surface (14) is an annular surface arranged around the axis of the bearing body (10), along the axial direction (Z), the first docking surface (14) includes a first port (1) and a second port (2) distributed at intervals, the radial size of the first docking surface (14) tends to increase from the first port (1) to the second port (2), and the second docking surface (15) matches the shape of the first docking surface (14) and is arranged to fit each other.

2. The bearing according to claim 1, characterized in that From the first port (1) to the second port (2), the radial dimension of the first docking surface (14) gradually increases, and the first docking surface (14) is a conical surface.

3. The bearing according to claim 2, characterized in that The angle between the generatrix of the conical surface and the reference surface is 5°-15°, and the reference surface is a surface perpendicular to the axial direction (Z).

4. The bearing according to claim 1, characterized in that Along the axial direction (Z), a limiting protrusion (16) is provided on one of the two adjacent ring bodies (12a) and a limiting slot (17) is provided on the other. The shape of the limiting protrusion (16) matches the shape of the limiting slot (17) and is clamped and arranged in the limiting slot (17).

5. The bearing according to claim 4, characterized in that The limiting protrusion (16) is provided starting from one of the first docking surface (14) and the second docking surface (15) and protruding from the ring body (12a) along the axial direction (Z), and the limiting groove (17) is provided starting from the other of the first docking surface (14) and the second docking surface (15) and recessed along the axial direction (Z).

6. The bearing according to claim 1, characterized in that A plurality of annular raceways (13) distributed along the axial direction (Z) are enclosed between the inner ring (11) and the outer ring (12), and a rolling body (20) is respectively arranged in each annular raceway (13). Along the axial direction (Z), the first docking surface (14) is located between two adjacent annular raceways (13).

7. The bearing according to claim 6, characterized in that The plurality of annular raceways (13) include a first annular raceway (13a), a second annular raceway (13b), and a third annular raceway (13c) which are sequentially spaced apart in the axial direction (Z), the second annular raceway (13b) is located between the first annular raceway (13a) and the third annular raceway (13c), and the first docking surface (14) is located between the second annular raceway (13b) and the third annular raceway (13c) in the axial direction (Z).

8. The bearing according to claim 1, wherein: Along the circumference of the bearing body (10), the inner ring (11) is provided with a plurality of first connection holes (18), and the outer ring (12) is provided with a plurality of second connection holes (19). The bearing body (10) is connected to the blades through the first connection holes (18) and is connected to the hub through the second connection holes (19).

9. The bearing according to claim 8, characterized in that The outer ring (12) includes two or more stacked ring bodies (12a), one of the two adjacent ring bodies (12a) includes the first docking surface (14) and the other includes the second docking surface (15); Each of the ring bodies (12a) is provided with a through hole extending in the axial direction (Z) and penetrating the first docking surface (14) and the second docking surface (15); adjacent ring bodies (12a) are docked through the through holes on the first docking surface (14) and the second docking surface (15) to form the second connecting hole (19).

10. A wind turbine generator set, characterized in that: The invention comprises a pitch system and a yaw system, wherein at least one of the pitch system and the yaw system comprises the bearing according to any one of claims 1 to 9.

11. The wind turbine generator set according to claim 10, characterized in that: The pitch system comprises a hub, blades, and a bearing according to any one of claims 1 to 9, wherein one of the inner ring (11) and the outer ring (12) is connected to the hub, and the other is connected to the blades.

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