Split asymmetric double-row tapered roller bearing and bearing ring thereof

Abstract

The utility model relates to the field of mechanical basic parts, in particular to a split type asymmetric double-row tapered roller bearing and a bearing ring thereof, the split type asymmetric double-row tapered roller bearing comprises an inner sleeve ring, an outer sleeve ring and a roller positioned between the inner sleeve ring and the outer sleeve ring, and the bearing ring comprises a split type sleeve ring which is split in the circumferential direction to form a split structure. In the two splicing surfaces of the adjacent split structures, one splicing surface is provided with an inward concave part, and the other splicing surface is provided with an outward convex part matched with the inward concave part, so that the adjacent split structures are meshed with each other after being spliced in the circumferential direction to realize axial stopping and positioning. Therefore, the time required for maintaining the bearing can be further shortened, the cost is reduced, and after the bearing ring is split in the axial direction and the circumferential direction at the same time, it can be guaranteed that after the bearing ring is split in the axial direction and the circumferential direction at the same time, axial dislocation cannot occur between adjacent sections of the same axial section of the bearing ring due to the large axial load borne by the main shaft, and the service life of the main shaft is prolonged. Therefore, the raceway can be accurately aligned in the circumferential direction, friction between the raceway and the roller is reduced, and the service life of the bearing is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of mechanical basic parts, in particular to a split asymmetric double-row tapered roller bearing and a bearing ring thereof. Background Art

[0002] With the rapid development of the new energy field, wind turbine main shaft bearings have become one of the core components of wind power generation equipment during the use of wind turbine generator sets. The main function of wind turbine main shaft bearings is to support the rotation of wind turbines to generate electricity, especially in wind turbines with main shafts and gearboxes, where they play a key role as the main support. Existing wind turbine main shaft bearings are directly assembled in the factory during installation, and the outer and inner rings of the bearings are an integral structure. With the increase in the number of installed units in recent years, there will be problems with bearing failure during use, and the cost of disassembling and assembling the wind turbine is very high.

[0003] In the prior art, a Chinese utility model patent with authorization announcement number CN220396274U and authorization announcement date 2024.01.26 discloses a split asymmetric spherical roller bearing for a wind turbine main shaft. The bearing includes a split inner ring, a split outer ring, a fastening ring, a cage and a roller. The section of the split inner ring is at a certain angle to the horizontal plane. The rollers are double-row with different sizes, one row of large-size rollers and one row of small-size rollers. The double-row rollers with different sizes form two different contact angles of the bearing. The fastening ring is a split structure, and the cross section of the split fastening ring is an asymmetric structure. The split fastening ring is placed in the middle groove of the split inner ring. The split fastening ring has a large rib and a small rib that cooperate with the large-size roller and the small-size roller respectively. The inclination angles of the large rib and the small rib are respectively parallel to the end surface lines of their respective rollers, and the length of the small rib is greater than the length of the large rib. The outer ring of the bearing adopts a split structure in the circumferential direction, which can shorten the time required for maintenance and reduce the cost of maintenance. However, the outer ring of the bearing is an integral whole in the axial direction. When repairing the bearing, the outer ring of the bearing needs to be disassembled and assembled radially. In this way, the parts on the radial outside of the outer ring of the bearing need to be removed to complete the operation, making it more difficult to repair the bearing.

[0004] There is also a bearing in the prior art whose outer ring is split axially, such as the double-row tapered roller bearing disclosed in the Chinese invention patent with application publication number CN114514382A and application publication date 2022.05.17. If this axially split design is applied to the above-mentioned prior art, the outer ring of the bearing can be disassembled from both the axial and radial directions, reducing the difficulty of disassembly. However, the outer ring of the bearing is split both circumferentially and axially, resulting in poor integrity of the entire outer ring of the bearing. During operation, the fan applies a large axial load to the main shaft of the fan, so axial misalignment is likely to occur between adjacent petals of the same axial segment of the outer ring of the bearing, resulting in the raceway being unable to be accurately aligned circumferentially, the raceway and rollers being more worn, and the bearing service life being shortened. Utility Model Content

[0005] The purpose of the utility model is to provide a bearing ring to solve the problem in the prior art that the bearing ring is difficult to maintain when it is only split in the circumferential direction, and to solve the problem that the bearing ring is split both in the circumferential direction and in the axial direction, resulting in poor integrity of the entire bearing ring, and the fan applies a large axial load to the fan main shaft during operation, so that axial misalignment is likely to occur between adjacent petals of the same axial segment of the bearing ring, resulting in the raceway circumferentially not being accurately aligned, the raceway and rollers being worn more, and the bearing service life being shortened. The utility model also provides a split asymmetric double-row tapered roller bearing to solve the same problem mentioned above.

[0006] In view of the above technical problems, the utility model adopts the following technical solutions.

[0007] A bearing ring includes a split ring that is split in the circumferential direction to form a split structure. Among the two splicing surfaces of adjacent petal structures, one has a concave part, and the other has a convex part that matches the concave part, so that the adjacent petal structures can bite each other after being spliced ​​in the circumferential direction to achieve axial blocking and positioning.

[0008] Furthermore, the splicing surface of the split structure includes two inclined surfaces that form a certain angle with the plane passing through the axis of the split ring and an arc transition surface between the two inclined surfaces. The concave part and the convex part are formed by the two inclined surfaces and the arc transition surface, and the arc transition surface is smoothly connected to the two inclined surfaces.

[0009] Furthermore, the angle between the inclined surface and the plane passing through the axis of the split ferrule is between 10° and 15°.

[0010] Furthermore, the angle between the inclined surface and the plane passing through the axis of the split ring is 10°.

[0011] Furthermore, the split ring is an outer ring of the bearing, and the split ring is a segmented structure split in the axial direction. The two joint surfaces of the adjacent petal structures of each segmented structure have the aforementioned concave part and convex part. The split ring is axially divided into a first segment of the outer ring, a second segment of the outer ring, and a third segment of the outer ring. The two raceways are respectively arranged on the first and third segments. The maximum inner diameter of each segment is not less than the maximum diameter of the raceway to ensure that each segment can be disassembled axially.

[0012] Furthermore, the large end surface of the first segment of the outer ring and the small end surface of the third segment of the outer ring are both provided with lifting holes.

[0013] Furthermore, the split ring is an inner ring of the bearing, and the split ring is a segmented structure split in the axial direction. The two joint surfaces of the adjacent petal structures of each segmented structure have the aforementioned concave part and convex part. The split ring is axially divided into a first segment of the inner ring, a second segment of the inner ring, and a third segment of the inner ring. The two raceways are respectively arranged on the first and third segments. The minimum outer diameter of each segment is not greater than the minimum diameter of the raceway to ensure that each segment can be disassembled axially.

[0014] The above technical solution has the following beneficial effects: the utility model proposes an improved bearing ring, the bearing ring of the utility model includes a split ring that is split in the circumferential direction to form a petal structure, one of the two splicing surfaces of the adjacent petal structures has an inner concave part, and the other has an outer convex part that matches the inner concave part, so that after the adjacent petal structures are spliced ​​in the circumferential direction, they bite each other to achieve axial stop positioning. Not only can the time required for bearing maintenance be further shortened and the cost be reduced, but also it can ensure that the large axial load applied to the main shaft of the fan during operation will not cause axial misalignment between adjacent petals of the same axial segment of the bearing ring, so that the raceway can be accurately aligned in the circumferential direction, reducing the friction between the raceway and the roller, thereby ensuring the service life of the bearing.

[0015] A split asymmetric double-row tapered roller bearing comprises an inner ring, an outer ring and a roller installed between the inner ring and the outer ring, wherein the inner ring and / or the outer ring comprises a split ring which is split in the circumferential direction to form a petal structure, wherein one of the two splicing surfaces of the adjacent petal structures has an inner concave portion and the other has an outer convex portion which matches the inner concave portion, so that the adjacent petal structures can bite into each other after being spliced ​​in the circumferential direction to achieve axial blocking and positioning.

[0016] Furthermore, the splicing surface of the split structure includes two inclined surfaces that form a certain angle with the plane passing through the axis of the split ring and an arc transition surface between the two inclined surfaces. The concave part and the convex part are formed by the two inclined surfaces and the arc transition surface, and the arc transition surface is smoothly connected to the two inclined surfaces.

[0017] Furthermore, the angle between the inclined surface and the plane passing through the axis of the split ferrule is between 10° and 15°.

[0018] Furthermore, the angle between the inclined surface and the plane passing through the axis of the split ring is 10°.

[0019] Furthermore, the split ring is an outer ring of the bearing, and the split ring is a segmented structure split in the axial direction. The two joint surfaces of the adjacent petal structures of each segmented structure have the aforementioned concave part and convex part. The split ring is axially divided into a first segment of the outer ring, a second segment of the outer ring, and a third segment of the outer ring. The two raceways are respectively arranged on the first and third segments. The maximum inner diameter of each segment is not less than the maximum diameter of the raceway to ensure that each segment can be disassembled axially.

[0020] Furthermore, the large end surface of the first segment of the outer ring and the small end surface of the third segment of the outer ring are both provided with lifting holes.

[0021] Furthermore, the split ring is an inner ring of the bearing, and the split ring is a segmented structure split in the axial direction. The two joint surfaces of the adjacent petal structures of each segmented structure have the aforementioned concave part and convex part. The split ring is axially divided into a first segment of the inner ring, a second segment of the inner ring, and a third segment of the inner ring. The two raceways are respectively arranged on the first and third segments. The minimum outer diameter of each segment is not greater than the minimum diameter of the raceway to ensure that each segment can be disassembled axially.

[0022] Furthermore, the inner ferrule is an integral inner ferrule, and a lifting hole is arranged on the end face of the inner ferrule. The end face of the inner ferrule with the lifting hole is on the same side as the large end face of the first segment of the outer ferrule, and a lifting hole is also arranged on the outer peripheral surface of the inner ferrule.

[0023] The above technical scheme has the following beneficial effects: the utility model proposes an improved split asymmetric double-row tapered roller bearing, including inner and outer rings and rollers installed between the inner and outer rings, the rings include split rings that are split in the circumferential direction to form a petal structure, one of the two splicing surfaces of the adjacent petal structures has an inner concave part, and the other has an outer convex part that matches the inner concave part, so that after the adjacent petal structures are spliced ​​in the circumferential direction, they can bite each other to achieve axial blocking and positioning. Not only can the time required for bearing maintenance be further shortened and the cost reduced, but also it can ensure that the large axial load applied to the main shaft of the fan during operation will not cause axial misalignment between adjacent petals of the same axial segment of the bearing ring, so that the raceway can be accurately aligned in the circumferential direction, reducing the friction between the raceway and the roller, thereby ensuring the service life of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of an embodiment of a split asymmetric double-row tapered roller bearing.

[0025] Figure 2 The figure is a schematic structural diagram of the third segment of the outer ring in an embodiment of a split asymmetric double-row tapered roller bearing.

[0026] Figure 3 The present invention is a radial cross-sectional view of the third segment of the outer ring in an embodiment of a split asymmetric double-row tapered roller bearing.

[0027] In the figure: 1. first section of the outer ring; 2. third section of the outer ring; 3. inner ring of the bearing; 4. first roller; 5. second roller; 6. first retaining frame; 7. second retaining frame; 8. second section of the outer ring; 9. lifting hole; 10. connecting bolt hole; 11. arc transition surface of the splicing surface; 12. inclined surface of the splicing surface. DETAILED DESCRIPTION

[0028] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0029] The utility model provides a split asymmetric double-row tapered roller bearing, wherein a bearing ring is arranged to be split in the circumferential direction of the bearing to form a split ring of a petal structure, one of two splicing surfaces of adjacent petal structures has an inner concave portion, and the other has an outer convex portion adapted to the inner concave portion, so that the adjacent petal structures can bite each other after being spliced ​​in the circumferential direction to achieve axial blocking and positioning, so that when the bearing is subjected to a large axial force, the adjacent petals after installation can be accurately aligned, and the rollers and raceways will not be worn too severely due to the force, thereby reducing the service life of the bearing.

[0030] Based on the above concept, the utility model provides a variety of different split asymmetric double-row tapered roller bearing embodiments for illustration.

[0031] In a more basic embodiment, Figure 1The split asymmetric double-row tapered roller bearing shown includes bearing rings, namely, an outer bearing ring and an inner bearing ring 3, a first retainer 6, a second retainer 7, a first roller 4 and a second roller 5. During installation, the first roller 4 is installed on the first retainer 6 and is installed as a whole on the first raceway of the inner bearing ring 3. The second roller 5 is installed on the second retainer 7 and is installed as a whole on the second raceway of the inner bearing ring 3. Specifically, at least one of the inner and outer rings of the bearing can be a split ring that is split in the circumferential direction to form a petal structure. Of the two splicing surfaces of adjacent petal structures, one has a concave portion and the other has a convex portion that matches the concave portion. When installing the bearing ring, the splicing surfaces of adjacent petal structures are precisely aligned and then fixed. This can prevent the adjacent petals from being axially misaligned when the bearing is subjected to a large axial force, thereby causing excessive wear of the rollers and raceways and reducing the service life of the bearing.

[0032] On the basis of the above-mentioned embodiment, the bearing ring is also split in the axial direction to form a segmented structure in the axial direction, which can be divided into two parts or four parts in the axial direction, and the two joint surfaces of the adjacent petal structures of each segmented structure have an inner concave part and an outer convex part. In a preferred embodiment, the outer ring of the bearing is a split ring split in the axial direction as an example, as shown in FIG. Figure 1 As shown, the bearing ring is divided into three parts in the axial direction, namely, the first segment 1 of the outer ring, the third segment 2 of the outer ring, and the second segment 8 of the outer ring. The two joint surfaces of the adjacent petal structures of each segment structure have an inner concave part and an outer convex part. The first segment 1 of the outer ring and the third segment 2 of the outer ring are provided with raceways. The maximum inner diameter of each segment is not less than the maximum diameter of the raceway, so as to ensure that each segment can be disassembled from the axial direction. In another preferred embodiment, taking the inner ring 3 of the bearing as a split ring that is split in the axial direction as an example, the two joint surfaces of the adjacent petal structures of each segment structure have the said inner concave part and the outer convex part. The split ring is divided into the first segment of the inner ring, the second segment of the inner ring, and the third segment of the inner ring in sequence in the axial direction. The two raceways are respectively provided on the first and third segments. The minimum outer diameter of each segment is not greater than the minimum diameter of the raceway, so as to ensure that each segment can be disassembled from the axial direction.

[0033] Based on the above embodiments, the bearing ring can be divided into a three-part petal structure or a four-part petal structure in the circumferential direction, and one of the two adjacent splicing surfaces of the petal structure has a concave portion, and the other has a convex portion that matches the concave portion. In a preferred embodiment, Figure 2The structural schematic diagram of the third segment 2 of the outer ring is shown, and the outer ring of the bearing is divided into two petal structures at a position of 180° in the circumferential direction, and of the two splicing surfaces of the adjacent petal structures, one has a concave part, and the other has a convex part that matches the concave part, and connecting bolt holes 10 are also provided at the splicing surfaces to use bolts to splice and fix the two petal structures, and the circumferential division method of the first segment 1 of the outer ring and the second segment 8 of the outer ring is consistent with that of the third segment 2 of the outer ring.

[0034] On the basis of the above-mentioned embodiments, the shape of the splicing surface of the petal structure formed by the circumferential splitting of the bearing ring can be semicircular or tooth-shaped. Preferably, the splicing surface of the petal structure includes two splicing surface inclined surfaces 12 that form a certain angle with the plane passing through the axis of the split ring and a splicing surface arc transition surface 11 between the two inclined surfaces. The two splicing surface inclined surfaces 12 and the splicing surface arc transition surface 11 form an inner concave part and an outer convex part. The splicing surface arc transition surface 11 is smoothly connected to the two splicing surface inclined surfaces 12. The angle between the splicing surface inclined surface 12 and the plane passing through the axis of the split ring is between 10°-15°. In a preferred embodiment, Figure 3 In the radial cross-sectional view of the third segment 2 of the outer ring shown, the angle between the joint surface slope 12 and the plane passing through the axis of the split ring is 10°, and a large arc R is used for transition where the two 10° slopes intersect. The joint surface of the outer ring first segment 1 and the outer ring second segment 8 at the circumferential split is consistent with the outer ring third segment 2.

[0035] On the basis of the above embodiment, the large end surface of the first segment 1 of the outer ring and the small end surface of the third segment 2 of the outer ring are both provided with hanging holes 9 for convenient installation and hanging. The number of hanging holes 9 can be 4 or 5, and the position of the hanging holes 9 can be any position. In a preferred embodiment, as Figure 2 As shown, the small end face of the third segment 2 of the outer ring is provided with three lifting holes 9 evenly arranged in the circumferential direction, the lifting holes 9 of the first segment 1 of the outer ring are provided on the large end face, and the end face of the inner ring 3 of the bearing is provided with lifting holes. The end face of the inner ring 3 of the bearing provided with the lifting holes is on the same side as the large end face of the first segment 1 of the outer ring, and the outer circumferential face of the inner ring 3 of the bearing is also provided with lifting holes.

[0036] When the split asymmetric double-row tapered roller bearing of the utility model is used on the main shaft of a wind power device, if the internal parts of the bearing are damaged and need to be repaired or the bearing ring is severely worn and needs to be replaced, the first section 1 of the outer ring, the second section 8 of the outer ring and the third section 2 of the outer ring can be firstly removed from the bearing in the axial direction, and then the outer ring of the bearing can be removed as a whole by loosening the connecting bolts used to connect the petal structure on the circumference of the outer ring, thereby facilitating the repair or replacement of damaged parts in the bearing.

[0037] The split asymmetric double-row tapered roller bearing of the utility model can also be used in other devices with harsh working environment, large working load and inconvenient bearing maintenance.

[0038] The specific structure of the bearing ring of the embodiment of the utility model is the same as the bearing ring structure of the split asymmetric double-row tapered roller bearing embodiment described above, and will not be further described herein.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bearing ring, comprising a split ring which is split in the circumferential direction to form a petal structure, characterized in that: One of the two splicing surfaces of the adjacent petal structures has an inner concave portion, and the other has an outer convex portion adapted to the inner concave portion, so that the adjacent petal structures can bite each other after circumferential splicing to achieve axial blocking and positioning.

2. The bearing ring according to claim 1, characterized in that: The splicing surface of the split-petal structure includes two inclined surfaces that form a certain angle with the plane passing through the axis of the split ring and an arc transition surface between the two inclined surfaces. The concave part and the convex part are formed by the two inclined surfaces and the arc transition surface, and the arc transition surface is smoothly connected to the two inclined surfaces.

3. The bearing ring according to claim 2, characterized in that: The angle between the inclined surface and the plane passing through the axis of the split ring is between 10° and 15°.

4. The bearing ring according to claim 3, characterized in that: The angle between the inclined surface and the plane passing through the axis of the split ring is 10°.

5. The bearing ring according to any one of claims 1 to 4, characterized in that: The split ring is an outer ring of the bearing. The split ring is a segmented structure split in the axial direction. The two joint surfaces of the adjacent petal structures of each segmented structure have the aforementioned concave part and convex part. The split ring is axially divided into a first segment of the outer ring, a second segment of the outer ring, and a third segment of the outer ring. The two raceways are respectively arranged on the first and third segments. The maximum inner diameter of each segment is not less than the maximum diameter of the raceway to ensure that each segment can be disassembled in the axial direction.

6. The bearing ring according to claim 5, characterized in that: The large end surface of the first segment of the outer ring and the small end surface of the third segment of the outer ring are both provided with hoisting holes.

7. The bearing ring according to any one of claims 1 to 4, characterized in that: The split ring is the inner ring of the bearing. The split ring is a segmented structure split in the axial direction. The two joint surfaces of the adjacent petal structures of each segmented structure have the aforementioned concave part and convex part. The split ring is axially divided into a first segment of the inner ring, a second segment of the inner ring, and a third segment of the inner ring. The two raceways are respectively arranged on the first and third segments. The minimum outer diameter of each segment is not greater than the minimum diameter of the raceway to ensure that each segment can be disassembled in the axial direction.

8. A split asymmetric double-row tapered roller bearing, comprising inner and outer rings and a roller mounted between the inner and outer rings, characterized in that: The outer ring is a bearing ring according to any one of claims 1 to 6, and / or the inner ring is a bearing ring according to any one of claims 1 to 4 or 7.

9. The split asymmetric double row tapered roller bearing according to claim 8, characterized in that: The inner ferrule is an integral inner ferrule, and a lifting hole is arranged on the end face of the inner ferrule. The end face of the inner ferrule with the lifting hole is on the same side as the large end face of the first segment of the outer ferrule, and a lifting hole is also arranged on the outer peripheral face of the inner ferrule.

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