Tapered roller bearing, shafting structure and wind generating set

Abstract

The embodiment of the invention provides a tapered roller bearing, a shaft system structure and a wind generating set. The tapered roller bearing comprises an inner ring, an outer ring, a retainer and a tapered roller, the inner ring and the outer ring are coaxially arranged in a sleeved mode, the retainer is arranged in a roller path between the inner ring and the outer ring, the tapered roller is located on the retainer, a first check ring matched with the large-diameter end of the tapered roller in a limiting mode is arranged in the circumferential direction of the inner ring, and the tapered roller bearing further comprises auxiliary rolling bodies. An auxiliary roller path is arranged between the inner circumferential face of the large-diameter end of the retainer and the outer circumferential face of the first check ring, and the auxiliary rolling body is arranged in the auxiliary roller path and can be driven by the retainer to roll. The auxiliary rolling body is used for guiding the retainer to rotate and bearing the weight of the retainer, the acting force between the retainer and the tapered roller can be reduced, the abrasion condition between the retainer and the tapered roller is reduced, the guiding precision is ensured, and smooth operation of the tapered roller bearing is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and particularly to a tapered roller bearing, a shafting structure, and a wind turbine generator set. Background Art

[0002] Currently, the cages of single-row tapered roller bearings are mainly turned solid cages, or stamped steel cages, or polyether ether ketone engineering plastic cages, and the guiding method is mainly based on the guiding of tapered rollers. With the development of the main shaft bearings of wind turbine generators towards large-scale, the weight of the cage is getting heavier, the force between the tapered rollers and the cage becomes larger, the wear of the tapered rollers and the cage increases, resulting in a decrease in guiding accuracy. Moreover, with the increase in the wear of the cage cross beam, the cage runout becomes larger, which will further reduce the guiding accuracy. Summary of the Invention

[0003] Therefore, the object of the present invention is to provide a tapered roller bearing, a shafting structure, and a wind turbine generator set to at least solve the problem of large force between the tapered rollers and the cage, resulting in relatively large wear.

[0004] The first aspect embodiment of the present invention provides a tapered roller bearing. The tapered roller bearing includes an inner ring and an outer ring coaxially sleeved, a cage disposed in the raceway between the inner ring and the outer ring, and tapered rollers located on the cage. A first retaining ring is provided on the circumference of the inner ring for limit fit with the large-diameter end of the tapered rollers. The tapered roller bearing further includes: auxiliary rolling elements. An auxiliary raceway is provided between the outer circumference of the first retaining ring and the inner circumference of the large-diameter end of the cage, and the auxiliary rolling elements are disposed in the auxiliary raceway and can roll under the drive of the cage.

[0005] For the tapered roller bearing provided by the embodiment of this aspect, a first retaining ring is provided on the circumference of the inner ring for limit fit with the large-diameter end of the tapered rollers. An auxiliary raceway is provided between the outer circumference of the first retaining ring and the inner circumference of the large-diameter end of the cage, and auxiliary rolling elements are disposed in the auxiliary raceway. By using the auxiliary rolling elements to guide the rotation of the cage and bear the weight of the cage, the force between the cage and the tapered rollers can be greatly reduced, the wear between the cage and the tapered rollers can be decreased, the guiding accuracy can be ensured, which is beneficial to the smooth operation of the tapered roller bearing.

[0006] The second aspect embodiment of the present invention provides a shafting structure, which includes an inner shaft and an outer shaft coaxially sleeved, and the tapered roller bearing provided by the first aspect embodiment as described above. The tapered roller bearing is disposed between the inner shaft and the outer shaft.

[0007] For the shafting structure provided by the embodiment of this aspect, since it has the tapered roller bearing provided by the first aspect embodiment as described above, it thus has the beneficial effects of the first aspect embodiment as described above, which will not be elaborated here.

[0008] An embodiment of the third aspect of the present invention provides a wind turbine generator, including the tapered roller bearing provided in the embodiment of the first aspect as described above, or the shafting structure provided in the embodiment of the second aspect as described above.

[0009] Since the wind turbine generator provided in the embodiment of this aspect has the tapered roller bearing provided in the embodiment of the first aspect or the shafting structure provided in the embodiment of the second aspect as described above, it thus has the beneficial effects of the embodiment of the first aspect or the second aspect as described above, which will not be elaborated herein.

[0010] Some other aspects and / or advantages of the general concept of the present invention will be described in part in the following description, some will be clear from the description, or can be learned through the implementation of the general concept of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Through the following description with reference to the drawings which exemplarily show an example, the above and other objects and features of the present invention will become clearer, wherein:

[0012] Figure 1 A schematic radial cross-sectional view of a tapered roller bearing showing an embodiment of the related art is shown;

[0013] Figure 2 A schematic radial cross-sectional view of a tapered roller bearing showing an embodiment of the present application is shown;

[0014] Figure 3 Shows Figure 2 A partial enlarged schematic view at I in...

[0015] Figure 4 A partial structural schematic view of an auxiliary rolling element and an auxiliary cage showing an embodiment of the present application is shown;

[0016] Figure 5 A structural schematic view of an auxiliary rolling element and an auxiliary cage showing an embodiment of the present application is shown;

[0017] Figure 6 Shows Figure 5 A partial schematic view of the method at J in...

[0018] Figure 7 A structural schematic view of an auxiliary rolling element and an auxiliary cage showing another embodiment of the present application is shown;

[0019] Figure 8 Shows Figure 7 A partial schematic view of the method at K in...

[0020] Figure 9 Shows Figure 8 A partial schematic view of the method at M in...

[0021] Figure 1 Description of reference numerals:

[0022] Inner ring 110a, outer ring 120a, cage 130a, tapered roller 140a;

[0023] Figures 2 to 9 Description of reference numerals:

[0024] Inner ring 110, first retaining ring 111, groove 112, second retaining ring 113, outer ring 120, cage 130, tapered roller 140,

[0025] Auxiliary rolling element 210, auxiliary cage 220, rolling element receiving portion 221, first connecting portion 222, second connecting portion 223, fastener 224, first clamping plate 225, second clamping plate 226. Detailed implementation manners

[0026] The following detailed implementation manners are provided to assist the reader in obtaining a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of operations described herein is merely exemplary and is not limited to those set forth herein, but may be changed as will be apparent after understanding the disclosure of the present application, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for greater clarity and conciseness.

[0027] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Instead, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein, which will be apparent after understanding the disclosure of the present application.

[0028] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more thereof.

[0029] Although terms such as "first", "second", and "third" may be used herein to describe various members, components, regions, layers, or parts, these members, components, regions, layers, or parts should not be limited by these terms. Instead, these terms are only used to distinguish one member, component, region, layer, or part from another. Thus, the first member, first component, first region, first layer, or first part referred to in the examples described herein may also be referred to as the second member, second component, second region, second layer, or second part without departing from the teachings of the examples.

[0030] In the specification, when an element such as a layer, a region, or a substrate is described as being "on" another element, "connected to" or "coupled to" another element, the element can be directly "on" the other element, directly "connected to" or "coupled to" the other element, or there can be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" or "directly coupled to" another element, there can be no other elements in between.

[0031] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising", "including", and "having" specify the presence of the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. The term "plurality" represents any quantity of two or more.

[0032] The orientation limitations in this application are based on the orientation of the product in the normal use state, unless otherwise specified that the orientation in the drawings shall prevail.

[0033] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs after understanding this invention. Unless explicitly defined as such herein, terms such as those defined in a general dictionary shall be construed to have a meaning consistent with their meaning in the context of the relevant art and this invention, and shall not be construed in an idealized or overly formal manner.

[0034] The main shaft bearing of a wind turbine in the related art is a tapered roller bearing, as Figure 1 shown, including an inner ring 110a, an outer ring 120a, a cage 130a located between the two, and tapered rollers 140a located on the cage 130a. The cage 130a is mainly guided to rotate by the tapered rollers 140a. As the size of the main bearing increases, the cage 130a becomes heavier and heavier, and the force between the cage 130a and the tapered rollers 140a increases, which will cause premature wear of the rolling surfaces of the tapered rollers 140 and the cage 130, reduce the guiding accuracy, and the cage 130a is deformed greatly, and the guiding effect becomes poor, which is not conducive to the operation of the bearing.

[0035] Based on this, an embodiment of the present invention provides a tapered roller bearing. By using an auxiliary rolling element 210 to guide the rotation of the cage 130 and share the weight of the cage 130, the force between the cage 130 and the tapered rollers 140 can be reduced, and the wear condition can be reduced. The following will be combined withFigures 2 to 9 An embodiment of the present invention provides a tapered roller bearing.

[0036] As Figure 2 , Figure 3 and Figure 4 shown, an embodiment of the first aspect of the present invention provides a tapered roller bearing. The tapered roller bearing includes an inner ring 110 and an outer ring 120 coaxially sleeved, a cage 130 disposed in a raceway between the inner ring 110 and the outer ring 120, and tapered rollers 140 located on the cage 130. A first retaining ring 111 that is in limit fit with the large-diameter end of the tapered rollers 140 is provided in the circumferential direction of the inner ring 110. The tapered roller bearing further includes: auxiliary rolling elements 210. An auxiliary raceway is provided between the inner circumferential surface of the large-diameter end of the cage 130 and the outer circumferential surface of the first retaining ring 111. The auxiliary rolling elements 210 are disposed in the auxiliary raceway and can roll under the drive of the cage 130.

[0037] For the tapered roller bearing provided by the embodiment of this aspect, the inner ring 110 has a first retaining ring 111 that is in limit fit with the large-diameter end of the tapered rollers 140. An auxiliary raceway is provided between the outer circumferential surface of the first retaining ring 111 and the inner circumferential surface of the large-diameter end of the cage 130. The auxiliary rolling elements 210 are disposed in the auxiliary raceway. The auxiliary rolling elements 210 are used to guide the rotation of the cage 130 and bear the weight of the cage 130, which can greatly reduce the acting force between the cage 130 and the tapered rollers 140, reduce the wear between the cage 130 and the tapered rollers 140, ensure the guiding accuracy, and is beneficial to the smooth operation of the tapered roller bearing.

[0038] Specifically, an auxiliary rolling element 210 is provided outside the first snap ring 111. By using the auxiliary rolling element 210 to support the large-diameter end of the cage 130, most of the weight of the cage 130 can be shared, thereby reducing the weight of the cage 130 falling on the tapered roller 140, which is beneficial to reducing the friction between the two and reducing the wear condition. Here, the first snap ring 111 can not only axially limit the tapered roller 140, but also support the auxiliary rolling element 210. On the one hand, it is beneficial for the auxiliary rolling element 210 to be close to the large-diameter end of the cage 130 and have a smaller size, facilitating the installation of the auxiliary rolling element 210. On the other hand, limited by the first snap ring 111, even if the tapered roller 140 undergoes axial movement, the auxiliary rolling element 210 on the outer periphery of the first snap ring 111 will not be directly affected by the tapered roller 140 and move axially. The auxiliary rolling element 210 can still guide the rotation of the cage 130 at the set position, thereby reversely restricting the axial movement of the cage 130 and improving the guiding accuracy. Moreover, the auxiliary rolling element 210 can roll under the drive of the inner ring 110 and at the same time drive the rotation of the cage 130 by using friction. Since the friction between the large-diameter end of the cage 130 and the first snap ring 111 is a raceway friction, the guiding accuracy of the cage 130 can be improved and the operating resistance of the cage 130 can be reduced. Moreover, after the large-diameter end of the cage 130 is supported by the auxiliary rolling element 210, there is a large radial clearance between it and the first snap ring 111, which is convenient for grease to enter the raceway from this clearance and facilitates lubrication.

[0039] Further, the first snap ring 111 is integrally formed with the inner ring 110, or the first snap ring 111 is detachably installed on the inner ring 110, or the first snap ring 111 is press-fitted on the inner ring 110.

[0040] Regarding the structure of the auxiliary raceway, further, in some embodiments, as Figure 3 shown, the auxiliary raceway includes a groove 112 provided on the outer peripheral surface of the first snap ring 111. A part of the auxiliary rolling element 210 extends into the groove 112 and rolls in the groove 112. The design of the groove 112 plays a role in limiting the auxiliary rolling element 210, which can prevent the axial movement of the auxiliary rolling element 210, and further limit the movement of the auxiliary rolling element 210 driving the cage 130, improving the guiding accuracy of the cage 130, and can also reduce the probability of the auxiliary rolling element 210 falling. Of course, those skilled in the art can think that the groove 112 can also be provided only at the large-diameter end of the cage to form an auxiliary raceway.

[0041] In some embodiments, the number of the grooves 112 is one and is annular, and the auxiliary rolling elements 210 roll circumferentially along the grooves 112. Of course, in some other embodiments, the number of the grooves 112 may also be plural, and they are distributed in one-to-one correspondence with the auxiliary rolling elements 210, and each auxiliary rolling element 210 rolls in a corresponding groove 112. At this time, an auxiliary cage 220 that rotates synchronously with the inner ring 110 may not be provided on the outer circumference of the auxiliary rolling elements 210.

[0042] Further, as Figure 2 and Figure 3 shown, the inner circumferential surface of the large-diameter end of the cage 130 is parallel to the outer circumferential surface of the first retaining ring 111. Then, when the auxiliary rolling elements 210 are arranged at multiple axial positions of the first retaining ring 111, they can all cooperate with the inner circumferential surface of the large-diameter end of the cage 130, which can reduce the requirements for the inner raceway position of the auxiliary rolling elements 210, reduce the processing difficulty, and control the overall cost. For example, on any radial section of the first retaining ring 111, the outer contour of the first retaining ring 111 away from the inner ring 110 is parallel to the axis of the inner ring 110, and on any radial section of the cage 130, the inner contour of the cage 130 close to the inner ring 110 is parallel to the axis of the inner ring 110. The inner raceway and the outer raceway of the auxiliary rolling elements 210 are linear, which is convenient for the accurate installation of the auxiliary rolling elements 210 in place.

[0043] As an example, as Figure 2 and Figure 3 shown, the large-diameter end of the cage 130 is bent inward in the radial direction and extends along the axial direction of the bearing, so that the outer contour of the cage 130 away from the inner ring 110 on any of its own radial sections is parallel to the axis of the inner ring 110, and the outer contour close to the inner ring 110 is also parallel to the axis of the inner ring 110, which has high structural strength and is convenient for processing.

[0044] Further, the auxiliary rolling elements 210 are spherical rollers or cylindrical rollers or needle rollers. When the auxiliary rolling elements 210 are spherical rollers, the spherical rollers roll flexibly, can better drive the rotation of the cage 130, and reduce the frictional resistance of the cage 130. When the auxiliary rolling elements 210 are cylindrical rollers or needle rollers, the auxiliary rolling elements 210 can stably support the cage 130.

[0045] To prevent the auxiliary rolling elements 210 from shifting or falling off, further, in some embodiments, as Figure 2 and Figure 3As shown in the figure, the tapered roller bearing further includes: an auxiliary cage 220 disposed in the auxiliary raceway, and auxiliary rolling elements 210 disposed on the auxiliary cage 220. Here, the auxiliary cage 220 is used to limit the auxiliary rolling elements 210, which can prevent the auxiliary rolling elements 210 from moving around or even falling off, ensuring that the auxiliary rolling elements 210 stably support and drive the cage 130 to rotate.

[0046] Regarding the structure of the auxiliary cage 220, further, in some embodiments, the auxiliary cage 220 includes a plurality of sub-cages spliced together in the circumferential direction, and each sub-cage has at least one auxiliary rolling element 210 therein.

[0047] As the size of the tapered roller bearing increases, the size of the cage 130 increases, and the size of the auxiliary cage 220 is also relatively large. It is difficult for the auxiliary cage 220 to be integrally stamped. Therefore, it is designed that the auxiliary cage 220 is composed of a plurality of sub-cages spliced together, which is convenient for processing, and the number of sub-cages and the number of auxiliary rolling elements 210 can be increased or decreased according to the size requirements, so that the auxiliary cage 220 can be universal for tapered roller bearings of different sizes, reducing costs.

[0048] In a specific application, the auxiliary cage 220 is a steel cage or a plastic cage.

[0049] Further, as Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 shown, each sub-cage includes a rolling element receiving portion 221, a first connecting portion 222 on one side of the rolling element receiving portion 221, and a second connecting portion 223 on the other side of the rolling element receiving portion 221. The auxiliary rolling elements 210 are disposed in the rolling element receiving portion 221. Among two circumferentially adjacent sub-cages, the first connecting portion 222 and the corresponding second connecting portion 223 are connected. Then, the structures of the plurality of sub-cages are the same, and the first connecting portion 222 of each sub-cage is connected to the second connecting portion 223 of another sub-cage in series to form the auxiliary cage 220, with a simple structure and convenient for processing.

[0050] Further, as Figure 4 , Figure 6 and Figure 8As shown, the first connecting portion 222 is formed as a slot, and the second connecting portion 223 is formed as a plug board. The plug board can be inserted into the slot. A first through hole is formed on the slot, and a second through hole is formed on the plug board. When the plug board is inserted into the slot, the first through hole and the second through hole can be aligned with each other. The auxiliary cage 220 further includes a fastener 224. The fastener 224 can be inserted into the first through hole and the second through hole to connect the first connecting portion 222 and the second connecting portion 223 together. The plug board and the slot are plugged together to connect two adjacent segments of the cage, and are locked by the fastener 224. The connection is convenient and firm. Moreover, when the fastener 224 is not tightened, the plug board can also rotate a certain angle in the slot, which is beneficial to forming a circle by the auxiliary cage 220 to adapt to the structure of the auxiliary raceway. Compared with the fixed bending radian of each segment of the cage, the versatility of the auxiliary cage 220 is improved.

[0051] In a specific application, the fastener 224 is a rivet or a plug pin or a bolt.

[0052] As an example, as Figure 4 、 Figure 7 、 Figure 8 and Figure 9 shown, each segment of the cage includes a strip-shaped first clamping plate 225 and a second clamping plate 226 which are arranged facing each other. A first receiving groove is formed on the first clamping plate 225, and a second receiving groove is formed on the second clamping plate 226. The first receiving groove and the second receiving groove face each other to form a rolling element receiving portion 221. The first ends of the first clamping plate 225 and the second clamping plate 226 are attached to each other to form a plug board, and the second ends of the first clamping plate 225 and the second clamping plate 226 are bent outward and away from each other, so as to form a slot therebetween.

[0053] Here, two clamping plates are stacked together to form the rolling element receiving portion 221, the first connecting portion 222 and the second connecting portion 223. The structure is simple and the processing is convenient. Moreover, it is convenient to place the auxiliary rolling element 210 in the first receiving groove or the second receiving groove, and then stack the two clamping plates together. Here, it is default that the auxiliary rolling element 210 is a spherical roller.

[0054] Of course, in other examples, the auxiliary rolling element 210 can also be a cylindrical roller or a needle roller. Correspondingly, semi-circular receiving grooves adapted to each other are formed on the first clamping plate 225 and the second clamping plate 226.

[0055] Furthermore, as Figure 3 and Figure 4As shown, the first clamping plate 225 and the second clamping plate 226 are combined with each other facing each other in the axial direction of the inner ring 110. The widths of the first clamping plate 225 and the second clamping plate 226 are smaller than the diameter of the auxiliary rolling element 210, so that the auxiliary rolling element 210 protrudes from the rolling element receiving portion 221. This facilitates the inner ring 110 to drive the auxiliary rolling element 210 to rotate without significant friction with the auxiliary cage 220.

[0056] Furthermore, in some embodiments, as Figure 2 shown, the inner ring 110 may further have a second retaining ring 113 that is in limit fit with the small-diameter end of the tapered roller 140 in the circumferential direction. The second retaining ring 113 supports the small-diameter end of the cage 130. Here, the second retaining ring 113 can be used to guide the rotation of the cage 130. In cooperation with the auxiliary rolling element 210 to guide the rotation of the cage 130, the cage 130 rotates smoothly. Moreover, by using the second retaining ring 113 to support the small-diameter end of the cage 130, the acting force between the cage 130 and the tapered roller 140 can be reduced, and the wear between the two can be reduced.

[0057] An embodiment of the second aspect of the present invention provides a shafting structure, including an inner shaft and an outer shaft sleeved coaxially, and a tapered roller bearing provided as in any one of the above embodiments, and the tapered roller bearing is arranged between the inner shaft and the outer shaft.

[0058] For the shafting structure provided by the embodiments of this aspect, since it has the tapered roller bearing provided by any one of the above embodiments, it thus has the beneficial effects of any one of the above embodiments, which will not be elaborated here.

[0059] An embodiment of the third aspect of the present invention provides a wind turbine generator, including a tapered roller bearing provided as in any one of the above embodiments, or a shafting structure provided by the second aspect embodiment above.

[0060] For the wind turbine generator provided by the embodiments of this aspect, since it has the tapered roller bearing or the shafting structure provided by any one of the above embodiments, it thus has the beneficial effects of any one of the above embodiments, which will not be elaborated here.

[0061] Although the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the present invention. It should be understood that, in the view of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention defined by the claims.

Claims

1. A tapered roller bearing, characterized in that, The tapered roller bearing includes an inner ring (110) and an outer ring (120) coaxially sleeved, a cage (130) disposed in a raceway between the inner ring (110) and the outer ring (120), and tapered rollers (140) located on the cage (130). A first retaining ring (111) for limit-fitting with the large-diameter ends of the tapered rollers (140) is provided in the circumferential direction of the inner ring (110). The tapered roller bearing further includes: Auxiliary rolling elements (210). An auxiliary raceway is provided between the inner circumferential surface of the large-diameter end of the cage (130) and the outer circumferential surface of the first retaining ring (111). The auxiliary rolling elements (210) are disposed in the auxiliary raceway and can roll under the drive of the cage (130).

2. The tapered roller bearing according to claim 1, wherein, The auxiliary raceway includes a groove (112) provided on the outer circumferential surface of the first retaining ring (111). A part of the auxiliary rolling element (210) extends into the groove (112) and rolls in the groove (112).

3. The tapered roller bearing according to claim 1, characterized in that, The inner circumferential surface of the large-diameter end of the cage (130) is parallel to the outer circumferential surface of the first retaining ring (111).

4. The tapered roller bearing according to claim 1, wherein The auxiliary rolling elements (210) are spherical rollers, cylindrical rollers or needle rollers.

5. The tapered roller bearing according to any one of claims 1 to 4, characterized in that, The tapered roller bearing further includes: An auxiliary cage (220) disposed in the auxiliary raceway. The auxiliary rolling elements (210) are disposed on the auxiliary cage (220).

6. The tapered roller bearing according to claim 5, characterized in that, The auxiliary cage (220) includes a plurality of sub-cages spliced together in the circumferential direction. At least one of the auxiliary rolling elements (210) is provided in each sub-cage.

7. The tapered roller bearing according to claim 6, characterized in that, Each sub-cage includes a rolling element receiving portion (221), a first connecting portion (222) located on one side of the rolling element receiving portion (221), and a second connecting portion (223) located on the other side of the rolling element receiving portion (221). The auxiliary rolling element (210) is disposed in the rolling element receiving portion (221). In two circumferentially adjacent sub-cages, the first connecting portion (222) and the corresponding second connecting portion (223) are connected.

8. The tapered roller bearing according to claim 7, wherein The first connecting portion (222) is formed as a slot, and the second connecting portion (223) is formed as a plug board. The plug board can be inserted into the slot. A first through hole is formed on the slot, and a second through hole is formed on the plug board. When the plug board is inserted into the slot, the first through hole and the second through hole can be aligned with each other. The auxiliary cage further includes a fastener (224). The fastener (224) can be inserted into the first through hole and the second through hole to connect the first connecting portion (222) and the second connecting portion (223) together.

9. The tapered roller bearing according to claim 8, characterized in that, Each of the sub-cages includes a strip-shaped first clamping plate (225) and a second clamping plate (226) which are arranged facing each other. A first receiving groove is formed on the first clamping plate (225), and a second receiving groove is formed on the second clamping plate (226). The first receiving groove and the second receiving groove face each other to form the rolling element receiving portion (221). The first ends of the first clamping plate (225) and the second clamping plate (226) are mutually attached to form the insertion plate, and the second ends of the first clamping plate (225) and the second clamping plate (226) are bent outward and away from each other, thereby forming the insertion slot therebetween.

10. The tapered roller bearing according to claim 9, characterized in that, The first clamping plate (225) and the second clamping plate (226) are joined together facing each other in the axial direction of the inner ring (110). The widths of the first clamping plate (225) and the second clamping plate (226) are smaller than the diameter of the auxiliary rolling element (210), such that the auxiliary rolling element (210) protrudes from the rolling element receiving portion (221).

11. The tapered roller bearing according to any one of claims 1 to 4, characterized in that, The inner ring (110) further has a second retaining ring (113) which is in limiting cooperation with the small-diameter end of the tapered roller (140) in the circumferential direction. The second retaining ring (113) supports the small-diameter end of the cage (130).

12. A shafting structure, characterized in that, It includes a coaxial inner shaft and an outer shaft, and a tapered roller bearing as described in any one of claims 1 to 11. The tapered roller bearing is arranged between the inner shaft and the outer shaft.

13. A wind power generating set, characterized in that, The wind power generating set includes: a tapered roller bearing as described in any one of claims 1 to 11, or a shafting structure as described in claim 12.

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