CN210686655U - Rolling bearings, motors and wind turbines - Google Patents

Abstract

Embodiments of the present application provide a rolling bearing, a motor and a wind turbine. The rolling bearing includes a bearing outer ring and a bearing inner ring provided with raceways; the cross section of the raceway passing through the central axis of the rolling bearing is an arc, and the arc includes There are multiple arc segments with the center of the circle located on the same side, and the two adjacent arc segments are smoothly transitionally connected; the curvature radius of each arc segment increases sequentially from the middle to the edge of the raceway. The rolling bearing provided by this application has a raceway with non-constant arc segment curvature. Through the design of changing curvature, when the unit is subjected to fatigue load without increasing the stress, the contact stress of the raceway is reduced, the load-bearing capacity of the rolling bearing is improved, and the rolling bearing is improved. The fatigue life of the raceway can also increase the load adaptability of motors and wind turbines, and greatly improve the maintenance cycles of motors and wind turbines.

Description

Rolling bearings, motors and wind turbines

technical field

The present application relates to the technical field of bearings, and in particular, the present application relates to a rolling bearing, a motor and a wind turbine.

Background technique

Rolling bearings are a kind of important standard parts that support rotating shafts and shaft parts. They generally include rolling elements, bearing inner rings, bearing outer rings and cages. There are raceways on the bearing inner ring and bearing outer ring. The body rolls in the raceway. In the field of wind power generation, rolling bearings are widely used parts. Because wind turbines are located in remote areas all year round, rolling bearings with longer life are required.

At present, both the yaw system and the pitch system of the wind turbine are designed with the same radius of curvature of the bearing raceways, that is, the raceways on the inner ring of the bearing and the outer race of the bearing are usually circular in shape. According to the different design concepts of rolling bearing manufacturers, there are differences in the value of the radius of curvature of the raceway, but a raceway composed of a single radius of curvature is used to support the mechanical rotation with the changing position of the rotating shaft. The wear of the raceway is easy to occur near the edge of the raceway, which will also have a great adverse effect on the maintenance cycle of the wind turbine.

Utility model content

In view of the shortcomings of the existing methods, the present application proposes a rolling bearing, a motor and a wind turbine to solve the technical problems in the prior art that the edge of the raceway is easy to wear and the service life of the bearing of the wind turbine is short.

In a first aspect, an embodiment of the present application provides a rolling bearing, including a bearing outer ring and a bearing inner ring each provided with a raceway;

The cross-section of the raceway passing through the central axis of the rolling bearing is an arc, and the arc includes multiple arc segments whose centers are located on the same side, and two adjacent arc segments are smoothly connected by transition;

The curvature radius of each arc segment increases sequentially from the middle of the raceway to the edge.

In one embodiment, the arc is symmetrical with respect to the center line in the radial direction of the rolling bearing.

In one embodiment, a lubricating groove is provided in the middle of the raceway.

In one embodiment, the arc includes a first arc segment and two second arc segments, and both ends of the first arc segment are connected with the second arc segments.

In one embodiment, the central angle β corresponding to the first arc segment is 0°<β≤70°, and the central angle γ corresponding to the second arc segment is 0°<γ≤20°.

In one embodiment, the arc line further includes two third arc line segments, and the third arc line segments are connected with the second arc line segments in a smooth transition.

In a second aspect, the present application provides an electrical machine, including a generator or an electric motor, and the electrical machine is characterized by comprising the rolling bearing provided in the first aspect of the present application.

In a third aspect, the present application provides a wind power generator set, including the generator provided in the second aspect of the present application.

The beneficial technical effects brought by the technical solutions provided in the embodiments of the present application are:

The rolling bearing provided by the present application has a raceway with non-constant curvature of the arc segment. Through the design of changing the curvature, the contact stress of the raceway is reduced, the bearing capacity of the rolling bearing is improved, and the rolling bearing is not increased under the condition that the fatigue load of the unit is not increased. Correspondingly, the load adaptability of the motor and the wind turbine can also be increased, and the maintenance cycle of the motor and the wind turbine can be greatly improved.

Additional aspects and advantages of the present application will be set forth in part in the following description, which will become apparent from the following description, or may be learned by practice of the present application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a schematic three-dimensional structure diagram of a rolling bearing provided by an embodiment of the application;

2 is a schematic diagram of a raceway cross-sectional structure of a rolling bearing provided by an embodiment of the application;

3 is a schematic diagram of a raceway cross-sectional structure of another rolling bearing provided by an embodiment of the application;

4 is a schematic diagram of a raceway cross-sectional structure of a rolling bearing with a lubricating groove provided by an embodiment of the application;

5 is a schematic diagram of the angle range of each arc segment in the raceway of a rolling bearing provided by an embodiment of the application;

FIG. 6 is a schematic diagram of a raceway cross-sectional structure of still another rolling bearing provided by an embodiment of the present application.

Reference number:

100-bearing inner ring, 200-bearing outer ring, 300-raceway, 400-ball;

310 - Lubrication groove.

Detailed ways

The application is described in detail below, and examples of embodiments of the application are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. Also, detailed descriptions of known technologies are omitted if they are not necessary for illustrating features of the present application. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, but not to be construed as a limitation on the present application.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms, such as those defined in a general dictionary, should be understood to have meanings consistent with their meanings in the context of the prior art and, unless specifically defined as herein, should not be interpreted in idealistic or overly formal meaning to explain.

It will be understood by those skilled in the art that the singular forms "a", "an", "the" and "the" as used herein can include the plural forms as well, unless expressly stated otherwise. It should be further understood that the word "comprising" used in the specification of this application refers to the presence of stated features, integers, steps, operations, elements and/or components, but does not preclude the presence or addition of one or more other features, Integers, steps, operations, elements, components and/or groups thereof. As used herein, the term "and/or" may include all or any element and all combinations of one or more of the associated listed items.

First of all, some terms involved in this application are introduced and explained:

The raceway, the surface of the load bearing part of the rolling bearing, is used as the rolling track of the rolling element, usually in the shape of a groove, which is an arc-shaped cross-section with a radius slightly larger than that of the ball. Raceways are provided on both the inner and outer rings of the bearing, and rolling bearings, especially ball bearings, roll in the space formed by the raceways on the inner and outer rings of the bearing.

The center line in the radial direction of the rolling bearing, which is radially collinear with the rolling bearing and passing through the geometric center point of the rolling bearing.

The inventor of the present application considers that the rolling bearing used in the existing wind power yaw system and pitch system adopts a raceway design with a single curvature radius, but in the wind power yaw system and pitch system, the rotation position and attitude often occur. Change, the force on the ball on the rolling bearing is not only the radial force of the bearing, but often deflects, making the rolling bearing prone to wear of the raceway near the edge of the raceway. Under such conditions, the bearing is used The service life is greatly reduced compared with ordinary use occasions, which also increases the maintenance frequency of wind turbines, which has a great adverse impact on production.

The bearing, motor and wind power generator set provided by the present application aim to solve the above technical problems in the prior art.

The technical solutions of the present application and how the technical solutions of the present application solve the above-mentioned technical problems will be described in detail below with specific examples.

In a first aspect, an embodiment of the present application provides a rolling bearing, as shown in FIG. 1 and FIG. 2 , including a bearing outer ring 200 and a bearing inner ring 100 each provided with a raceway 300; a raceway passing through the central axis of the rolling bearing The cross section of 300 is an arc, the arc includes multiple arc segments with the center of the circle located on the same side, and two adjacent arc segments are connected by a smooth transition; the curvature radii of the two adjacent arc segments are different from each other.

In this application, the cross-sections of the raceways 300 on the bearing outer ring 200 and the bearing inner ring 100 are matched to each other, and the design ideas are the same, except that there may be differences in size, so this application does not distinguish and describe the raceways 300 on the bearing outer ring 200 separately. and the raceway 300 on the inner ring 100 of the bearing. A common structure also included on the rolling bearing is a cage, because it is not the focus of the improvement of this application, and will not be described further. The cross-section of the raceway 300 in the rolling bearing provided by this application is composed of multi-segment arc segments with different curvature radii. If it is too large, the specific setting can be determined according to the specific working conditions of the rolling bearing application and the overall structure.

The rolling bearing provided by the present application has a raceway 300 with a non-constant curvature of the arc segment. Through the design of changing the curvature, when the fatigue load of the unit is not increased, when the bearing capacity of the bearing is changed in the direction of the force, the original use of a single unit is reduced. The contact stress of the raceway 300 borne by the type raceway 300 improves the overall bearing capacity of the rolling bearing, well adapts to the bearing operating conditions where the rotational position may change, and improves the service life of the rolling bearing in a special working environment.

In a feasible embodiment, as shown in FIG. 3 , the arc line is symmetrical with respect to the center line in the radial direction of the rolling bearing. For example, the arc includes two second arc segments of equal length with a radius R2 and a first arc segment with a radius R1. In most cases, the stress condition of the rolling bearing is left and right balanced, so the raceway 300 of the rolling bearing adopts a symmetrical figure. The requirement to improve the overall bearing capacity of the rolling bearing can also ensure that the rolling bearing has a relatively balanced force condition and ensure that the rolling bearing has a long service life.

In a feasible embodiment, as shown in FIG. 4 , a lubricating groove 310 is provided in the middle of the raceway 300 . A lubricating groove 310 is arranged in the middle of the raceway 300, which can provide storage space for lubricating oil or grease, improve the lubricity of the rolling bearing, and ensure that the rolling bearing is fully and permanently lubricated under the condition of a cross-section composed of multi-segment arc segments with different curvatures.

In a feasible implementation manner, as shown in FIG. 2 , the curvature radius of each arc segment increases sequentially from the middle of the raceway 300 to the edge. Each arc segment is composed of a combination of gradually opening from the middle to both sides of the bearing raceway 300. The arc segment near the middle of the raceway 300 has a small curvature radius and a large curvature, while the arc segment near the edge of the raceway 300 has a large curvature radius. The curvature is small, and it tends to be straight. According to engineering calculation and FEA (Finite Element Analysis), it can be known that the smaller the curvature radius of the raceway 300 is, the lower the contact stress of the raceway 300, the lower the contact stress of the raceway 300 and the ball 400. The greater the contact risk of the edge of the raceway 300, the greater the value of the radius of curvature of the raceway 300, the higher the contact stress of the raceway 300, and the lower the risk of the edge contact between the raceway 300 and the ball 400. By adopting the design that the curvature radius of each arc segment increases sequentially from the middle of the raceway 300 to the edge, the contact stress of the rolling bearing raceway 300 and the contact risk between the raceway 300 and the edge of the ball 400 can be balanced, and the position of the rotating shaft can be improved. Changing service life of rolling bearings.

In a feasible implementation manner, as shown in FIG. 3 , the arc includes a first arc segment and two second arc segments, and both ends of the first arc segment are connected with the second arc segments. As a relatively simple design solution, the arc of the cross-section of the raceway 300 is composed of arc segments with two curvatures, one of which is located in the middle, and the other is located on both sides. When the arc is a symmetrical figure, The two second arc segments are of equal length. The rolling bearing of this structure has a relatively simple structure and is convenient to process, and can make the rolling bearing meet the working conditions of the rotating shaft position changing constantly in most cases.

In a specific embodiment, as shown in FIG. 5 , the central angle β corresponding to the first arc segment is 0°<β≤70°, and the central angle γ corresponding to the second arc segment is 0°<γ≤20 °. Outside the second arc segment is the first arc segment, and the first arc segment can occupy a larger proportion in the cross section of the raceway 300 to ensure that the rolling bearing works stably in a rotating condition with a constant rotating shaft position.

In a specific embodiment, as shown in FIG. 6 , the arc further includes two third arc segments, and the third arc segments and the second arc segments are connected in a smooth transition. The radius of the third arc segment is R3, and the corresponding central angle is α. In combination with the foregoing embodiments, the arc can be a symmetrical figure, that is, the length of the two third arc segments is the same, or it can be a partially symmetrical figure, that is, the first arc segment and the second arc segment are partially symmetrical, while the two first arc segments are partially symmetrical. The lengths of the three arc segments are different, and the specific design scheme is based on different use requirements. For example, it is used in occasions where the wind direction changes frequently. In this occasion, the position of the rotating shaft of the rolling bearing changes continuously, and the rolling bearing also rotates around its own axis. The mechanical environment is relatively complex during rotation. To ensure a balance between the contact stress of the raceway 300 and the contact risk between the raceway 300 and the edge of the steel ball, arc segments with three curvature radii are used to form the cross section of the raceway 300 . Of course, the technical solution of using arc segments with more curvature radii to form the cross section of the raceway 300 is not excluded, so as to cope with more complex application scenarios.

In a second aspect, the present application provides an electrical machine, including a generator or an electric motor, and the electrical machine is characterized by comprising the rolling bearing provided in the first aspect of the present application.

The motor provided in this application adopts a rolling bearing with a raceway 300 with a non-constant curvature of the arc segment. The rolling bearing has a design with a variable curvature through the raceway 300. Under the condition that the unit is not aggravated by the fatigue load, the bearing capacity of the bearing is not increased. When the direction of the force changes, the contact stress of the raceway 300 that originally used a single curvature of the raceway 300 is reduced, the overall bearing capacity of the rolling bearing is improved, and it is well adapted to the operating conditions of the bearing where the rotational position may change, and improves the rolling bearing in special conditions. Service life in working environment. As a result, the adaptability of the motor to application scenarios with complex mechanical working conditions is improved, which is beneficial to improve the working life of the motor.

In a third aspect, the present application provides a wind power generator set, including the generator provided in the second aspect of the present application.

The wind generator set provided in this application adopts the motor provided by this application. Due to the application of the rolling bearing provided in this application, the adaptability of the motor to application scenarios with complex mechanical working conditions is improved, and the working life of the motor is longer, so that the The effective working life of the wind turbine is longer, and the maintenance cycle of the wind turbine can also be greatly improved, which saves maintenance costs and reduces power generation costs. Optionally, the wind power generator set in the present application is specifically a wind power generator set, and the electrical machine is a generator and/or a motor in the wind power generator set.

By applying the embodiments provided in this application, at least the following beneficial effects can be achieved:

1. The rolling bearing provided by this application has a raceway with a non-constant curvature of the arc segment. Through the design of changing the curvature, when the fatigue load of the unit is not increased, when the direction of the bearing capacity is changed, the original use is reduced. The single raceway bears the contact stress of the raceway, which improves the overall bearing capacity of the rolling bearing, adapts well to the operating conditions of the bearing with possible changes in the rotational position, and improves the service life of the rolling bearing under special working conditions.

2. The rolling bearing provided by this application is provided with a lubricating groove in the middle of the raceway, which can provide storage space for lubricating oil or grease, improve the lubricity of the rolling bearing, and ensure that the rolling bearing has a cross section composed of multiple arc segments with different curvatures. Get adequate and long-lasting lubrication.

3. The rolling bearing provided by this application adopts the design that the curvature radius of each arc segment increases sequentially from the middle of the raceway to the edge, which can balance the contact stress of the rolling bearing raceway and the contact risk between the raceway and the edge of the ball, and improve the performance of the rolling bearing. The service life of the rolling bearing with the changing position of the rotating shaft.

4. The rolling bearing provided in this application, the raceway cross-sectional shape is composed of arc segments with three curvature radii, which can ensure that the contact stress of the raceway and the risk of contact between the raceway and the edge of the steel ball are balanced, so that the rolling bearing is in the mechanical environment. used in complex situations.

5. Since the motor provided in this application adopts the above-mentioned rolling bearing provided in this application, it can better adapt to application scenarios with complex mechanical working conditions, and has a longer working life.

6. The wind turbine generator set provided in this application, due to the use of the motor with the above-mentioned rolling bearing provided by the application, has a longer effective working life, longer maintenance cycle of the wind turbine generator set, lower maintenance cost and power generation cost, and can generate more economical.

Those skilled in the art can understand that various operations, methods, steps, measures, and solutions in the process discussed in this application may be alternated, modified, combined or deleted. Further, other steps, measures, and solutions in the various operations, methods, and processes that have been discussed in this application may also be alternated, modified, rearranged, decomposed, combined, or deleted. Further, steps, measures and solutions in the prior art with various operations, methods, and processes disclosed in this application may also be alternated, modified, rearranged, decomposed, combined or deleted.

In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present application.

The terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of this application, unless stated otherwise, "plurality" means two or more.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

In the description of this specification, the particular features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

It should be understood that although the various steps in the flowchart of the accompanying drawings are sequentially shown in the order indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless explicitly stated herein, the execution of these steps is not strictly limited to the order and may be performed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but may be executed at different times, and the execution sequence is also It does not have to be performed sequentially, but may be performed alternately or alternately with other steps or at least a portion of sub-steps or stages of other steps.

The above are only part of the embodiments of the present application. It should be pointed out that for those skilled in the art, without departing from the principles of the present application, several improvements and modifications can also be made. It should be regarded as the protection scope of this application.

Claims (8)

1. A rolling bearing, characterized in that it comprises a bearing outer ring (200) and a bearing inner ring (100) provided with a raceway (300); The cross section of the raceway (300) passing through the central axis of the rolling bearing is an arc, and the arc includes a plurality of arc segments whose centers are located on the same side, and two adjacent arc segments are connected by a smooth transition; The curvature radius of each arc segment increases sequentially from the middle of the raceway (300) to the edge. 2 . The rolling bearing according to claim 1 , wherein the arc line is symmetrical with respect to the center line in the radial direction of the rolling bearing. 3 . 3. The rolling bearing according to claim 1, wherein a lubricating groove (310) is provided in the middle of the raceway (300). 4. The rolling bearing according to any one of claims 1 to 3, wherein the arc comprises a first arc segment and two second arc segments, and two of the first arc segments Both ends are connected with the second arc segment. 5. The rolling bearing according to claim 4, wherein the central angle β corresponding to the first arc segment is 0°<β≤70°, and the central angle γ corresponding to the second arc segment is 0 °<γ≤20°. 6 . The rolling bearing according to claim 4 , wherein the arc line further comprises two third arc line segments, and the third arc line segments are connected with the second arc line segments in a smooth transition. 7 . 7 . An electrical machine comprising a generator or an electric motor, wherein the electrical machine is characterized by comprising the rolling bearing according to any one of claims 1 to 6 . 8. A wind power generating set, characterized in that it comprises a generator as claimed in claim 7.

Images