Axial retainer structure of wind power bearing

Abstract

The invention relates to the technical field of bearing retainers, and discloses a wind power bearing axial retainer structure which comprises a plurality of axial retainer units, and each axial retainer unit is integrally arranged in an arc shape so that a whole circle structure can be defined by the multiple axial retainer units. Each retainer unit comprises an inner flange, an outer flange and a connecting beam connected between the flanges, and each connecting beam comprises edge beams connected with the ends of the two flanges and a lintel between the edge beams; the upper side and the lower side of each lintel are each provided with a first limiting part with the opposite extending direction so as to limit the corresponding roller. A first limiting part is arranged on the corresponding side of each edge beam, a second limiting part is arranged on the other side of each edge beam, and protruding parts are arranged on the sides, away from each other, of the two flanges to improve the strength of the flanges; according to the wind power bearing retainer unit structure, stress balance of the upper side and the lower side of the retainer can be achieved, the stability of the retainer is improved through surface contact of the left side face and the right side face of the retainer, the strength is improved by arranging the protruding parts on the front side and the rear side of the retainer, and the fracture risk of the retainer is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bearing retainers, and in particular to an axial retainer structure of a wind power bearing. Background Art

[0002] Rolling bearings are basic parts of machinery and are widely used in various types of machinery. In order to improve the power generation efficiency and increase the power output of wind turbines, the length of blades, the size of main shafts, speed increasers, generators and other parts are also constantly expanding, which makes the outer diameter of bearings also continue to expand; but the load borne by the bearings is also gradually increasing. Large wind power rolling bearings generally include four major parts: inner ring, outer ring, roller and cage. Roller bearings can withstand large radial loads and axial loads. The cage plays the role of isolating the rolling elements and guiding their movement in the rolling bearing. However, during the operation of the bearing, wear will cause damage to the bearing parts, and eventually lead to the loss of bearing dimensional accuracy and other related problems.

[0003] The current wind turbine roller bearings are too large, and the weight of the cage itself will cause them to deform. This deformation will cause additional contact between the rolling element and the cage, and thus generate additional friction, which will lead to deformation of the cage and even the rolling element. The existing technology divides the large-sized cage into multiple cage units, eliminating the deformation problem of large cages due to their own weight. However, after the large cage is divided into multiple cage units, since there is no fixed connection between adjacent cages, and there is a certain gap between the roller and the cage ribs on its circumference and the connecting beam structure between the ribs, it is difficult to ensure the force balance of the cage structure under heavy loads. The activities of different cages between the inner and outer rings of the bearing may be inconsistent, which can easily lead to excessive friction between individual axial cage units and rollers, and then cause the ribs or connecting beams of the cage units to break. When a cage unit is damaged, as the bearing runs, the cage force becomes more unbalanced, which will cause serious economic losses. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an axial retainer structure for a wind turbine bearing. The retainer unit structure for a wind turbine bearing can achieve balanced force on the upper and lower sides of the retainer. The left and right sides of the retainer improve the stability of the retainer through surface contact to prevent excessive friction with the rollers. The front and rear sides of the retainer are provided with protrusions to improve the strength and reduce the risk of retainer breakage.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A wind power bearing axial retainer structure includes a plurality of axial retainer units, each of which is arranged in an arc shape as a whole to realize a structure enclosed by multiple axial retainer units in a full circle, the retainer unit includes an inner rib and an outer rib and a connecting beam connected between the ribs, the connecting beam includes a side beam connecting the ends of the two ribs and a lintel between the side beams; the upper and lower sides of each lintel are provided with first limiting portions extending in opposite directions to limit rollers; a first limiting portion is provided on one side corresponding to each side beam, and a second limiting portion is provided on the other side; the second limiting portion and the side beam are in the same plane; the inner rib and the outer rib are arranged in an arc shape as a whole, and a protrusion is provided on the side away from the two ribs to improve the strength of the ribs.

[0007] As a further implementation, the first limiting portion is arranged in an arc shape as a whole, and is used to limit the position of the roller.

[0008] As a further implementation method, the inner side surface of the first limiting portion is an arcuate surface, which includes a transition portion and an extension portion arranged in sequence, one end of the transition portion is connected to the upper side and / or lower side of the connecting beam, and the other end is arranged in an arc shape and connected to the extension portion, and the outer side surface of the extension portion is parallel to the upper side surface of the connecting beam; the outer side surface of one end of the transition portion connected to the connecting beam is a plane and is in the same plane as the connecting beam, and the outer side surface of the other end is an arcuate surface, so that the outer side surface of the side beam is in a cross shape.

[0009] As a further implementation, the first limiting portions on the same side of two adjacent connecting beams extend in opposite directions, so that the same number of rollers are installed on the same side of the axial retaining frame unit.

[0010] As a further implementation, the extension direction of the first limiting portion on one side beam of the axial retaining frame unit is toward the other side beam, and is opposite to the extension direction of the first limiting portion on the same side of the lintel adjacent to the side beam.

[0011] As a further implementation, the first limiting portion and the second limiting portion are correspondingly arranged at the middle position of the side beam and the lintel.

[0012] As a further implementation method, the second limiting portion is rectangular and has the same height as the first limiting portion. The second limiting portion on each side beam contacts and cooperates with the first limiting portion on the side beam of the adjacent axial retaining frame unit, and the corresponding first limiting portion extends in a direction away from the second limiting portion.

[0013] As a further implementation method, the left and right side surfaces of the side beams and the lintel are planar structures.

[0014] As a further implementation method, a first protrusion is provided on the inner side surface of the inner retaining edge, both ends of the first protrusion extend to the middle position of two adjacent pocket holes, the outer surface of the first protrusion is a plane, and each two adjacent pocket holes correspond to a first protrusion.

[0015] As a further implementation method, a second protrusion is provided on the outer side surface of the outer retaining edge, and two ends of the second protrusion are close to two connecting beams of the same pocket, and each pocket corresponds to a second protrusion.

[0016] The beneficial effects of the present invention are as follows:

[0017] The wind power bearing retainer unit structure of the present invention can achieve balanced force on the upper and lower sides of the retainer, and the left and right sides of the retainer improve the stability of the retainer through surface contact. The front and rear sides of the retainer are provided with protrusions to improve the strength and reduce the risk of retainer breakage; through the above-mentioned structural design, the retainer structure is balanced and symmetrical in force, thereby reducing the activity of the retainer unit in the bearing, and further reducing the risk of excessive friction between the roller and the retainer; the first limiting part is a transition part and an extension part, and the extension part extends toward the middle direction of the pocket, so that the first limiting part can better cooperate with the roller. When the retainer is displaced, the roller can better limit the retainer and reduce the activity of the retainer unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 Schematic diagram of the axial retainer structure of a wind power bearing in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the outer side structure of the axial retainer of a wind power bearing in an embodiment of the present invention;

[0021] Figure 3 This is a front view of the axial retainer structure of a wind power bearing in an embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of the end face structure of the axial retainer of a wind power bearing in an embodiment of the present invention.

[0023] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0024] Among them: 1. inner retaining edge, 2. outer retaining edge, 3. first protrusion, 4. second protrusion, 5. side beam, 6. lintel, 8. second limiting portion; 7. first limiting portion, 71. transition portion, 72. extension portion. DETAILED DESCRIPTION

[0025] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0026] Embodiment 1

[0027] In a typical embodiment of the present invention, reference is made to Figure 1-Figure 4 As shown, an axial retainer structure of a wind power bearing includes a plurality of axial retainer units, each of which is arranged in an arc shape as a whole to realize a plurality of axial retainer units enclosing a full circle structure, and is installed between the inner ring and the outer ring of the bearing.

[0028] The cage unit comprises an inner rib 1 and an outer rib 2 and a connecting beam connected between the inner and outer ribs, wherein the connecting beam comprises a side beam 5 connecting the ends of the two ribs and a cross beam 6 between the two side beams.

[0029] In this embodiment, five groups of connecting beams are provided, including two groups of side beams 5 and three groups of lintels 6. Figure 1 As shown, pockets for installing rollers are formed between two adjacent connecting beams, so one axial cage unit has four pockets. The inner rib and the outer rib are arc-shaped as a whole, so as to realize that multiple axial cage units are surrounded by a full circle structure.

[0030] In order to prevent the friction between the roller and the axial cage structure from increasing under heavy load, causing the flange of the axial cage unit to break, a protrusion is provided on one side of the two flanges away from each other to improve the flange strength.

[0031] like Figure 1 As shown, the inner side surface of the inner rib 1 is provided with a first protrusion 3, and the end of the first protrusion 3 extends to the middle position of two adjacent pockets, so that one first protrusion 3 spans two adjacent pockets, and the outer surface of the first protrusion is a plane. By providing the first protrusion 3, the strength of the inner rib 1 is improved and the risk of fracture is reduced.

[0032] like Figure 1 As shown, a second protrusion 4 is provided on the outer side surface of the outer rib 2, and both ends of the second protrusion 4 are close to two connecting beams of the same pocket, so each pocket corresponds to a second protrusion.

[0033] Since the axial cage needs to be cast by a mold, the inner baffle 1 is located close to the glue inlet, and in order to prevent the occurrence of air holes, a first protrusion 3 is set across two pockets, and two first protrusions 3 are provided on each set of the inner rib 1 of the cage. The outer rib 2 is far away from the glue inlet, and in order to ensure sufficient structural strength, each second protrusion is set corresponding to a pocket.

[0034] The second protrusions 4 are provided to improve the strength of the outer rib 2 , and the number of the second protrusions 4 is twice the number of the first protrusions 3 , thereby ensuring the strength of the outer rib 2 .

[0035] The thickness between adjacent protrusions on the inner and outer ribs is smaller than the thickness of the protrusions, so that the retainer of this embodiment can take into account both structural strength and structural deadweight.

[0036] Considering that it is difficult to ensure balanced force on the cage structure under heavy loads, the movement of different cages between the inner and outer rings of the bearing may be inconsistent, which can easily lead to excessive friction between individual axial cage units and rollers, and thus cause the ribs or connecting beams of the cage unit to break.

[0037] In this embodiment, each lintel 6 is provided with first limit portions 7 extending in opposite directions on both sides to limit the roller. Each side beam is provided with a first limit portion 7 on one side and a second limit portion 8 on the other side. Figure 2 shown.

[0038] The first limiting portion 7 is arranged in an arc shape as a whole, and is used to limit the position of the roller. Specifically, the inner side surface of the first limiting portion is an arc surface, which includes a transition portion 71 and an extension portion 72 arranged in sequence, one end of the transition portion 71 is connected to the upper side and the lower side of the lintel 6, and the outer side surface of the transition portion 71 close to this end is a plane, and is in the same plane as the side surface of the lintel away from the extension direction of the first limiting portion. The other end of the transition portion is integrally connected to the extension portion 72 and its outer side surface is an arc surface with an arc of 90°, so that the outer side surface of the extension portion 72 is a plane structure, and the outer side surface of the extension portion is parallel to the upper side surface of the connecting beam.

[0039] The surfaces on the left and right sides of each connecting beam close to the pocket holes are flat, so that after multiple axial cage units are spliced ​​in sequence, the adjacent side beam sides can achieve surface contact, ensuring the relative fixation between adjacent axial cage units and preventing the problem of inconsistent activities of different cage units, thereby reducing the risk of cage breakage.

[0040] In this example, the upper and lower sides refer to the two sides where the limiter is set on the connecting beam; the direction in which the two side beams move away from each other is the left and right sides. The front side can be the inner side of the edge, that is, the inner edge 1 is located in front of the outer edge 2.

[0041] The first limiting portions on the same side of two adjacent connecting beams extend in opposite directions, so that the same number of rollers are installed on the same side of the axial retaining frame unit.

[0042] Since the first limiting portion 7 extends toward the middle position of the pocket and the extending portion 72 is provided, the area for cooperation with the roller is increased. When the retaining frame moves under load, the roller can better limit the movement of the retaining frame through the extending portion 72 and the transition portion.

[0043] In addition, the arrangement of the first limiting portion 7 in this embodiment enables the same number of rollers to be installed on the same side of the axial retainer unit. Figure 2 When installing the rollers, two rollers need to be installed into the pockets from the upper side, and two rollers need to be installed into the pockets from the lower side. The rollers in adjacent pockets need to be installed from different sides of the cage.

[0044] The cage unit of this embodiment has a centrally symmetrical structure. Therefore, when a large load occurs, the upper and lower sides of the cage unit are subjected to balanced forces, and the cage unit will not undergo axial movement in the bearing, making the cage more stable in the inner and outer rings of the bearing and reducing the risk of large friction between the rollers and the cage.

[0045] The outer side surface of one end of the transition portion 71 connected to the connecting beam is a plane and is in the same plane as the connecting beam, so that the outer side surface of the side beam 5 (the plane away from the other side beam) is in a cross shape, such as Figure 4 shown.

[0046] In order to ensure that two adjacent cage units are in surface contact, the first limiting portion 7 on the side beam 5 of one cage unit extends toward the other side beam 5, and is opposite to the extension direction of the first limiting portion on the same side of the lintel adjacent to the side beam 5. Since the second limiting portion 8 needs to be opposite to the first limiting portion 7 adjacent to the same side, the second limiting portion 8 is set to a rectangular structure, and the second limiting portion 8 and the side beam 5 are in the same plane. The left and right side surfaces of the side beam 5 and the lintel 6 are planar structures.

[0047] The first limiting portion 7 and the second limiting portion 8 are correspondingly arranged at the middle position of the side beam 5 and the lintel 6. The arrangement of the first limiting portion 7 and the second limiting portion 8 on the side beam 5 makes its side surface cross-shaped, thereby improving the strength of the side beam and reducing the risk of cracking.

[0048] like Figure 2 As shown, the second limiting portion 8 is rectangular and has the same height as the first limiting portion 7. The second limiting portion on each side beam contacts and cooperates with the outer plane of the transition portion of the first limiting portion 7 on the side beam of the adjacent axial retaining frame unit, and the corresponding first limiting portion 7 extends in a direction away from the second limiting portion 8. Through contact and cooperation, the friction between the retaining frame units is increased to form a self-locking structure, so that the retaining frame is more stable between the inner and outer rings of the bearing and will not move excessively.

[0049] This embodiment can achieve balanced force on the upper and lower sides of the cage. The left and right sides of the cage are in surface contact to improve the stability of the cage. Protrusions are provided on the front and rear sides of the cage to improve the strength. Through the above-mentioned structural design, the cage structure of this embodiment is balanced and symmetrical in force, thereby reducing the activity of the cage unit in the bearing, and further reducing the risk of excessive friction between the roller and the cage.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wind turbine bearing axial retainer structure, characterized in that: It comprises a plurality of axial retaining frame units, each of which is arranged in an arc shape as a whole so as to realize that the plurality of axial retaining frame units form a full circle structure, the retaining frame unit comprises an inner rib and an outer rib and a connecting beam connected between the ribs, the connecting beam comprises a side beam connecting the ends of the two ribs and a lintel between the side beams; the upper and lower sides of each lintel are provided with a first limiting portion with opposite extension directions to limit the roller; a first limiting portion is provided on one side corresponding to each side beam, and a second limiting portion is provided on the other side; the second limiting portion and the side beam are in the same plane; the inner rib and the outer rib are in an arc shape as a whole, and a protrusion is provided on one side of the two ribs away from each other to improve the strength of the ribs.

2. The wind turbine bearing axial retainer structure according to claim 1, characterized in that: The first limiting portion is arranged in an arc shape as a whole and is used to limit the position of the roller.

3. The wind turbine bearing axial retainer structure according to claim 2, characterized in that: The inner side surface of the first limiting portion is an arcuate surface, which includes a transition portion and an extension portion which are arranged in sequence, one end of the transition portion is connected to the upper side and / or lower side of the connecting beam, and the other end is arranged in an arc shape and connected to the extension portion, and the outer side surface of the extension portion is parallel to the upper side surface of the connecting beam; the outer side surface of one end of the transition portion connected to the connecting beam is a plane and is in the same plane as the connecting beam, and the outer side surface of the other end is an arcuate surface, so that the outer side surface of the side beam is in the shape of a cross.

4. The wind turbine bearing axial retainer structure according to claim 1, characterized in that: The first limiting portions on the same side of two adjacent connecting beams extend in opposite directions, so that the same number of rollers are installed from the same side of the axial retaining frame unit.

5. The wind turbine bearing axial retainer structure according to claim 1, characterized in that: The extension direction of the first limiting portion on one side beam of the axial retainer unit is toward the other side beam, and is opposite to the extension direction of the first limiting portion on the same side of the cross beam adjacent to the side beam.

6. The wind turbine bearing axial retainer structure according to claim 1, characterized in that: The first limiting portion and the second limiting portion are correspondingly arranged at the middle position between the side beam and the lintel.

7. The wind turbine bearing axial retainer structure according to claim 6, characterized in that: The second limiting portion is rectangular and has the same height as the first limiting portion. The second limiting portion on each side beam contacts and cooperates with the first limiting portion on the side beam of the adjacent axial retaining frame unit, and the corresponding first limiting portion extends in a direction away from the second limiting portion.

8. The wind turbine bearing axial retainer structure according to claim 7, characterized in that: The left and right side surfaces of the side beam and the lintel are planar structures.

9. The wind turbine bearing axial retainer structure according to claim 1, characterized in that: A first protrusion is disposed on the inner side surface of the inner retaining edge, both ends of the first protrusion extend to the middle position of two adjacent pocket holes, the outer surface of the first protrusion is a plane, and each two adjacent pocket holes correspond to one first protrusion.

10. The wind turbine bearing axial retainer structure according to claim 1, characterized in that: A second protrusion is disposed on the outer side surface of the outer retaining edge, and two ends of the second protrusion are close to two connecting beams of the same pocket, and each pocket corresponds to a second protrusion.

Images