Self-aligning bearing

Abstract

The invention provides a self-aligning bearing which comprises a bearing outer ring, a bearing inner ring, a plurality of rolling bodies and a sealing structure, and the sealing structure comprises a first sealing assembly and a second sealing assembly which are arranged on the two axial sides of the bearing outer ring. A first annular convex shoulder and a second annular convex shoulder extend out of the two axial sides of the bearing inner ring respectively and are provided with a first convex-spherical-surface-shaped contact face (first spherical surface) and a second convex-spherical-surface-shaped contact face (second spherical surface) respectively. The first sealing assembly and the second sealing assembly only need to make contact with the first contact face and the second contact face respectively, the first spherical face, the second spherical face and the raceway face (third spherical face) of the concave spherical outer ring raceway share the same sphere center, and the sphere center of the first spherical face and the sphere center of the second spherical face are consistent with or coincide with the bearing center of the self-aligning bearing. When the self-aligning angle of the self-aligning bearing is changed, the magnitude of interference of the first sealing assembly and the second sealing assembly is kept unchanged or stable.

Description

Technical Field

[0001] The present invention belongs to the technical field of bearings, and particularly relates to a self-aligning bearing. Background Art

[0002] A self-aligning bearing is a special rolling bearing, and its design features enable it to adapt to misalignment or angular deviation between the shaft and the bearing housing, thereby maintaining stability and efficiency during operation. The outer ring raceway of the self-aligning bearing is designed as a spherical shape, and the inner ring raceway is inclined at a certain angle with respect to the bearing axis. This structure endows the bearing with the ability of self-aligning, and can compensate for the problem of non-coincidence of the axes caused by installation errors, shaft deformation or bearing housing deformation.

[0003] Currently, due to the self-aligning function of the self-aligning bearing, it is not easily affected by the angular misalignment error between the shaft and the bearing housing or shaft bending, and can adapt to the angular error caused by installation errors or shaft deflection. However, when the self-aligning bearing rotates to generate a self-aligning angle, as the self-aligning angle of the self-aligning bearing changes, the interference amount of the bearing seal structure located between the bearing outer ring and the bearing inner ring will change, resulting in inconsistent sealing performance of the self-aligning bearing at different self-aligning angles. When the interference amount between the bearing seal structure and the bearing inner ring is small, it is easy for dirt to enter the self-aligning bearing or the grease inside the self-aligning bearing to leak out; when the interference amount between the bearing seal structure and the bearing inner ring is large, it will increase the friction between the bearing seal structure and the bearing inner ring, increase the heat generation, and also exacerbate the wear and reduce the service life of the seal. Summary of the Invention

[0004] Based on the above problems existing in the prior art, the purpose of the embodiments of the present invention is to provide a self-aligning bearing to solve the problem that in the prior art, when the self-aligning bearing rotates to generate a self-aligning angle, as the self-aligning angle of the self-aligning bearing changes, the interference amount of the bearing seal structure located between the bearing outer ring and the bearing inner ring will change, resulting in inconsistent sealing performance of the self-aligning bearing at different self-aligning angles.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: to provide a self-aligning bearing, including:

[0006] A bearing outer ring, on the inner surface of which there is an outer ring raceway;

[0007] A bearing inner ring, on the outer surface of which there is an inner ring raceway;

[0008] A plurality of rolling elements, arranged between the bearing outer ring and the bearing inner ring, and each of the rolling elements is respectively rollingly supported in the outer ring raceway and the inner ring raceway; and

[0009] Sealing structure, including a first sealing component and a second sealing component respectively arranged on two axial sides of the outer ring of the bearing; a first annular shoulder extends from one axial side of the inner ring of the bearing, a first contact surface is provided on the first annular shoulder, the first sealing component is connected to the outer ring of the bearing, and the first sealing component contacts the first contact surface; a second annular shoulder extends from the other axial side of the inner ring of the bearing, a second contact surface is provided on the second annular shoulder, the second sealing component is connected to the outer ring of the bearing, and the second sealing component contacts the second contact surface;

[0010] Wherein, the first contact surface is a first spherical surface with a convex spherical shape, the second contact surface is a second spherical surface with a convex spherical shape, the raceway surface of the outer raceway is a third spherical surface with a concave spherical shape, the first spherical surface, the second spherical surface and the third spherical surface share the same center of the sphere, and the center of the first spherical surface and the center of the second spherical surface respectively coincide with the bearing center of the self-aligning bearing.

[0011] Further, the first sealing component includes a first annular sealing body contacting the first contact surface and a first annular sealing cover connected to the outer ring of the bearing, the first annular sealing body is fixedly connected to the inner side of the first annular sealing cover, and a first avoidance gap is formed between the first annular sealing cover and the first contact surface; and / or, the second sealing component includes a second annular sealing body contacting the second contact surface and a second annular sealing cover connected to the outer ring of the bearing, the second annular sealing body is fixedly connected to the inner side of the second annular sealing cover, and a second avoidance gap is formed between the second annular sealing cover and the second contact surface.

[0012] Further, the first sealing component includes a first annular sealing body and a first annular sealing cover connected to the outer ring of the bearing, the first annular sealing body includes a first sealing main body connected to the first annular sealing cover and a first sealing lip arranged on the first sealing main body, and the first sealing lip contacts the first contact surface; and / or, the second sealing component includes a second annular sealing body and a second annular sealing cover connected to the outer ring of the bearing, the second annular sealing body includes a second sealing main body connected to the second annular sealing cover and a second sealing lip arranged on the second sealing main body, and the second sealing lip contacts the second contact surface.

[0013] Further, a plurality of first sealing lips are provided on the first sealing main body, and the plurality of first sealing lips are sequentially arranged at intervals along the axial direction of the first annular sealing cover; and / or, a plurality of second sealing lips are provided on the second sealing main body, and the plurality of second sealing lips are sequentially arranged at intervals along the axial direction of the second annular sealing cover.

[0014] Further, the first annular seal cover is arranged as an outward-expanded metal frame structure, and the first annular seal body is arranged in a first inner cavity inside the first annular seal cover to limit the inner ring of the bearing; and / or, the second annular seal cover is arranged as an outward-expanded metal frame structure, and the second annular seal body is arranged in a second inner cavity inside the second annular seal cover to limit the inner ring of the bearing.

[0015] Further, the first annular seal cover and / or the second annular seal cover are fixedly connected to the outer ring of the bearing by stamping or spin riveting.

[0016] Further, the first seal assembly and / or the second seal assembly are located outside the outer ring of the bearing, and the first seal assembly and / or the second seal assembly are located outside the inner ring of the bearing.

[0017] Further, the first seal assembly, the second seal assembly, the outer ring of the bearing and the inner ring of the bearing enclose a space for accommodating the rolling elements, and the part of the interior of the accommodating space outside the rolling elements constitutes a grease injection space.

[0018] Further, the first annular seal cover and / or the second annular seal cover are provided with inclined surfaces.

[0019] Further, the self-aligning bearing further includes a cage for guiding the rolling elements, and the rolling elements are rollers or balls.

[0020] One or more of the above technical solutions in the embodiments of the present invention, compared with the prior art, have at least one of the following beneficial effects:

[0021] In the self-aligning bearing according to the embodiment of the present invention, a first annular shoulder and a second annular shoulder respectively extend from both axial sides of the inner ring of the bearing. A convex spherical first contact surface (first spherical surface) is provided on the first annular shoulder, and a convex spherical second contact surface (second spherical surface) is provided on the second annular shoulder. It is only necessary to make the first sealing assembly on one side of the outer ring of the bearing contact the first contact surface, and at the same time make the second sealing assembly on the other side of the outer ring of the bearing contact the second contact surface. Since the first spherical surface, the second spherical surface and the raceway surface (third spherical surface) of the concave spherical outer raceway are co-centered, and the centers of the first spherical surface and the second spherical surface coincide with or are the same as the bearing center of the self-aligning bearing respectively, when the alignment angle of the self-aligning bearing changes, the first sealing assembly and the second sealing assembly will not deform, so that the interference amount of the first sealing assembly and the second sealing assembly will also remain unchanged, avoiding the phenomenon that the sealing performance of the self-aligning bearing is inconsistent or unstable at different alignment angles, thereby effectively solving the problem that the change of the alignment angle of the self-aligning bearing has an adverse effect on the sealing performance of the sealing structure, the bearing temperature rise and the bearing life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is a three-dimensional structural schematic diagram of the self-aligning bearing provided by the embodiment of the present invention;

[0024] Figure 2 is a partial sectional structural schematic diagram of the self-aligning bearing provided by the embodiment of the present invention;

[0025] Figure 3 is a sectional structural schematic diagram of the self-aligning bearing provided by the embodiment of the present invention;

[0026] Figure 4 is a three-dimensional structural schematic diagram of the inner ring of the bearing provided by the embodiment of the present invention;

[0027] Figure 5 is a three-dimensional structural schematic diagram of the outer ring of the bearing provided by the embodiment of the present invention;

[0028] Figure 6 is an assembly drawing of the outer ring and the inner ring of the bearing provided by the embodiment of the present invention;

[0029] Figure 7 is an assembly drawing of the first sealing assembly provided by the embodiment of the present invention;

[0030] Figure 8 Exploded view of the first sealing assembly provided by the embodiment of the present invention;

[0031] Figure 9 Assembly drawing of the second sealing assembly provided by the embodiment of the present invention;

[0032] Figure 10 Exploded view of the second sealing assembly provided by the embodiment of the present invention;

[0033] Figure 11 Exploded view of the self-aligning bearing provided by the embodiment of the present invention;

[0034] Figure 12 Schematic cross-sectional structure diagram of the self-aligning bearing provided by another embodiment of the present invention;

[0035] Figure 13 Schematic cross-sectional structure diagram of the self-aligning bearing provided by another embodiment of the present invention;

[0036] Figure 14 Schematic cross-sectional structure diagram of the self-aligning bearing provided by another embodiment of the present invention.

[0037] Among them, the reference numerals in the figure:

[0038] 1 - Bearing outer ring; 11 - Outer ring raceway; 12 - First card slot; 13 - Second card slot;

[0039] 2 - Bearing inner ring; 21 - Inner ring raceway;

[0040] 3 - Rolling element;

[0041] 4 - First sealing assembly; 41 - First annular seal; 411 - First seal body; 412 - First seal lip; 42 - First annular seal cover; 421 - First inner cavity;

[0042] 5 - Second sealing assembly; 51 - Second annular seal; 511 - Second seal body; 512 - Second seal lip; 52 - Second annular seal cover; 521 - Second inner cavity;

[0043] 6 - First annular shoulder; 61 - First contact surface;

[0044] 7 - Second annular shoulder; 71 - Second contact surface;

[0045] 8 - First clearance; 9 - Second clearance;

[0046] 10 - Accommodation space; 20 - Inclined surface. Detailed implementation manners

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] It should be noted that when an element is referred to as being "connected to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0049] In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined. The meaning of "a plurality" is one or more unless otherwise specifically defined.

[0050] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0051] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Reference to "an embodiment" or "embodiments" throughout the specification means that the specific features, structures, or characteristics described in connection with the embodiments are included in at least one embodiment of the present application. Thus, the phrases "in one embodiment", "in some embodiments", or "in some of these embodiments" appear in various places throughout the specification, and not all references are to the same embodiment. In addition, in one or more embodiments, the specific features, structures, or characteristics may be combined in any suitable manner.

[0053] Please refer to Figures 1 to 11 , and now the self-aligning bearing provided by the embodiment of the present invention will be described. Please further refer to Figure 1 , Figure 2 and Figure 3 , the self-aligning bearing provided by the embodiment of the present invention includes an outer bearing ring 1, an inner bearing ring 2, a plurality of rolling elements 3 and a sealing structure. An outer raceway 11 is provided on the inner surface of the outer bearing ring 1, and an inner raceway 21 is provided on the outer surface of the inner bearing ring 2. The plurality of rolling elements 3 are arranged in a circumferential array between the outer bearing ring 1 and the inner bearing ring 2, and each rolling element 3 is respectively rollingly supported in the outer raceway 11 and the inner raceway 21, so that the outer bearing ring 1 can be rollingly arranged on the inner bearing ring 2 through the plurality of rolling elements 3. The sealing structure includes a first sealing assembly 4 and a second sealing assembly 5 respectively provided on both axial sides of the outer bearing ring 1, that is, the first sealing assembly 4 and the second sealing assembly 5 are respectively provided on both sides of the outer bearing ring 1. Please further refer to Figure 2 , Figure 4 and Figure 11 , a first annular shoulder 6 extends from one axial side of the inner bearing ring 2. A first contact surface 61 is provided on the first annular shoulder 6. The first sealing assembly 4 is connected to the outer bearing ring 1, and the first sealing assembly 4 is in sliding contact or interference contact with the first contact surface 61. A second annular shoulder 7 extends from the other axial side of the inner bearing ring 2. A second contact surface 71 is provided on the second annular shoulder 7. The second sealing assembly 5 is connected to the outer bearing ring 1, and the second sealing assembly 5 is in sliding contact or interference contact with the second contact surface 71. Among them, the first contact surface 61 is a first spherical surface that is a convex spherical surface, the second contact surface 71 is a second spherical surface that is a convex spherical surface, the raceway surface of the outer raceway 11 is a third spherical surface that is a concave spherical surface. The first spherical surface, the second spherical surface and the third spherical surface share the same center of the sphere, and the center of the first spherical surface and the center of the second spherical surface are respectively consistent or coincident with the bearing center of the self-aligning bearing. Please further refer to Figure 3, when the self-aligning bearing rotates to generate a self-aligning angle, since the first sealing assembly 4 is in sliding contact or interference contact with the convex spherical first contact surface 61, and the second sealing assembly 5 is in sliding contact or interference contact with the convex spherical second contact surface 71, the spherical center of the convex spherical first contact surface 61 (the first spherical surface), the spherical center of the convex spherical second contact surface 71 (the second spherical surface), and the raceway surface (the third spherical surface) of the concave spherical outer raceway 11 are co-spherical. In addition, the spherical center of the first spherical surface and the spherical center of the second spherical surface coincide with or are the same as the bearing center of the self-aligning bearing respectively. Even if the self-aligning angle of the self-aligning bearing changes, the interference amounts of the first sealing assembly 4 and the second sealing assembly 5 located on both sides of the bearing outer ring 1 will not change, avoiding the phenomenon that the sealing performance of the self-aligning bearing is inconsistent at different self-aligning angles, and fully ensuring that the interference amounts of the first sealing assembly 4 and the second sealing assembly 5 in contact with the bearing inner ring 2 are neither too small nor too large, thereby effectively solving the problem that the change of the self-aligning angle of the self-aligning bearing has an adverse impact on the sealing performance of the sealing structure, the bearing temperature rise, and the bearing life.

[0054] In the self-aligning bearing provided by the embodiment of the present invention, compared with the prior art, a first annular shoulder 6 and a second annular shoulder 7 respectively extend out on both axial sides of the bearing inner ring 2. A first contact surface 61 is provided on the first annular shoulder 6, and a second contact surface 71 is provided on the second annular shoulder 7. It is only necessary to make the first sealing assembly 4 located on one side of the bearing outer ring 1 in sliding contact or interference contact with the convex spherical first contact surface 61, and at the same time make the second sealing assembly 5 located on the other side of the bearing outer ring 1 in sliding contact or interference contact with the convex spherical second contact surface 71. Since the spherical center of the convex spherical first contact surface 61 (the first spherical surface), the spherical center of the convex spherical second contact surface 71 (the second spherical surface), and the raceway surface (the third spherical surface) of the concave spherical outer raceway 11 are co-spherical. In addition, the spherical center of the first spherical surface and the spherical center of the second spherical surface coincide with or are the same as the bearing center of the self-aligning bearing respectively. Even if the self-aligning angle of the self-aligning bearing changes, the interference amounts of the first sealing assembly 4 and the second sealing assembly 5 will remain unchanged, avoiding the phenomenon that the sealing performance of the self-aligning bearing is inconsistent at different self-aligning angles, and effectively solving the problem that the change of the self-aligning angle of the self-aligning bearing has an adverse impact on the sealing performance of the sealing structure, the bearing temperature rise, and the bearing life.

[0055] Please further refer to Figure 2 , Figure 7 and Figure 8, in some of these embodiments, the first sealing assembly 4 includes a first annular seal body 41 and a first annular seal cover 42. The inner edge of the first annular seal body 41 is in sliding contact or interference contact with the first contact surface 61 of the concave spherical shape on the first annular shoulder 6. The outer edge of the first annular seal cover 42 is connected to the outer ring 1 of the bearing. The first annular seal body 41 is fixedly connected to the inner side of the first annular seal cover 42 by adhesion or hot melting. Through the above structural arrangement, the first annular seal body 41 can be installed on one axial side of the outer ring 1 of the bearing through the first annular seal cover 42 to achieve the sealing of the self-aligning bearing. Since the first annular seal body 41 is arranged inside the first annular seal cover 42, the first annular seal body 41 can be protected by the first annular seal cover 42. In addition, in order to avoid interference between the inner edge of the first annular seal cover 42 and the first contact surface 61 of the concave spherical shape on the first annular shoulder 6, a first avoidance gap 8 is formed between the inner edge of the first annular seal cover 42 and the first contact surface 61. At the same time, the first avoidance gap 8 between the inner edge of the first annular seal cover 42 and the first contact surface 61 can stably filter out pollution particles to block the impact of particle pollutants on the first annular seal body 41. It should be noted that the first annular seal body 41 can be, but is not limited to, sealing members or elastic members such as rubber parts, silicone rubber parts or silicone rubber parts, and the first annular seal cover 42 can be, but is not limited to, metal parts such as iron, copper, aluminum, etc.

[0056] Please further refer to Figure 2 , Figure 9 and Figure 10, in some embodiments, the second sealing assembly 5 includes a second annular seal body 51 and a second annular seal cover 52. The inner edge of the second annular seal body 51 is in sliding contact or interference contact with the concave spherical second contact surface 71 on the second annular shoulder 7. The outer edge of the second annular seal cover 52 is connected to the outer ring 1 of the bearing. The second annular seal body 51 is fixedly connected to the inner side of the second annular seal cover 52 by adhesion or hot melting. Through the above structural arrangement, the second annular seal body 51 can be installed on the other side of the outer ring 1 of the bearing axially through the second annular seal cover 52 to achieve the sealing of the self-aligning bearing. Since the second annular seal body 51 is arranged inside the second annular seal cover 52, the second annular seal cover 52 can protect the second annular seal body 51. In addition, in order to avoid interference between the inner edge of the second annular seal cover 52 and the concave spherical second contact surface 71 on the second annular shoulder 7, a second avoidance gap 9 is formed between the inner edge of the second annular seal cover 52 and the second contact surface 71. At the same time, the second avoidance gap 9 between the inner edge of the second annular seal cover 52 and the second contact surface 71 can stably filter out pollution particles to block the impact of particulate contaminants on the second annular seal body 51. It should be noted that the second annular seal body 51 can be, but is not limited to, sealing parts or elastic parts such as rubber parts, silica gel parts or silicone rubber parts, and the second annular seal cover 52 can be, but is not limited to, metal parts such as iron, copper, and aluminum.

[0057] Please further refer to Figure 3 , Figure 7 and Figure 8 , in some embodiments, the first sealing assembly 4 includes a first annular seal cover 42 and a first annular seal body 41. The outer edge of the first annular seal cover 42 is connected to the outer ring 1 of the bearing. The first annular seal body 41 includes a first sealing main body 411 connected to the first annular seal cover 42 and a first sealing lip 412 provided on the first sealing main body 411. The first sealing lip 412 is in sliding contact or interference contact with the first contact surface 61. The first annular seal cover 42 supports the first annular seal body 41 to prevent the deformation of the first annular seal body 41 from causing a change in the interference amount between the first sealing lip 412 and the first contact surface 61, thereby affecting the sealing performance.

[0058] Please further refer to Figure 2 , Figure 9 and Figure 10, in some embodiments, the second sealing assembly 5 includes a second annular sealing cover 52 and a second annular sealing body 51. The outer edge of the second annular sealing cover 52 is connected to the outer ring 1 of the bearing. The second annular sealing body 51 includes a second sealing main body 511 connected to the second annular sealing cover 52 and a second sealing lip 512 provided on the second sealing main body 511. The second sealing lip 512 is in sliding contact or interference contact with the second contact surface 71. The second annular sealing cover 52 supports the second annular sealing body 51 to prevent the second annular sealing body 51 from deforming and causing a change in the interference amount between the second sealing lip 512 and the second contact surface 71, thereby affecting the sealing performance.

[0059] Please further refer to Figure 2 , Figure 3 and Figure 8 , in some embodiments, a plurality of first sealing lips 412 are provided on the first sealing main body 411. The plurality of first sealing lips 412 are sequentially spaced along the axial direction of the first annular sealing cover 42, so as to form multiple seals and effectively improve the sealing performance. Moreover, the distance between adjacent two first sealing lips 412 is equal, which is beneficial to ensuring that the interference amount of the first sealing assembly 4 remains unchanged or stable.

[0060] Please further refer to Figure 2 , Figure 3 and Figure 10 , in some embodiments, a plurality of second sealing lips 512 are provided on the second sealing main body 511. The plurality of second sealing lips 512 are sequentially spaced along the axial direction of the second annular sealing cover 52, so as to form multiple seals and effectively improve the sealing performance. Moreover, the distance between adjacent two second sealing lips 512 is equal, which is beneficial to ensuring that the interference amount of the second sealing assembly 5 remains unchanged or stable.

[0061] Please further refer to Figure 2 , Figure 3 and Figure 7 , in some embodiments, the first annular sealing cover 42 is arranged as an outward-expanded metal skeleton structure. The first annular sealing body 41 is arranged in a first inner cavity 421 inside the first annular sealing cover 42 to limit the inner ring 2 of the bearing. At the same time, the first annular sealing cover 42 is arranged as an outward-expanded metal skeleton structure, which can not only avoid the contact between the first annular sealing body 41 and the rolling elements 3 and increase the alignment angle of the self-aligning bearing, but also effectively increase the grease filling space inside the self-aligning bearing, and more lubricating grease can be filled to improve the operation and maintenance cycle of the equipment.

[0062] Please further refer to Figure 2 , Figure 3 and Figure 9, in some embodiments, the second annular seal cover 52 is arranged as an outward-expanded metal skeleton structure, and the second annular seal body 51 is disposed in the second inner cavity 521 inside the second annular seal cover 52 to limit the inner ring 2 of the bearing. At the same time, the second annular seal cover 52 is arranged as an outward-expanded metal skeleton structure, which can not only avoid the contact between the second annular seal body 51 and the rolling elements 3 and increase the alignment angle of the self-aligning bearing, but also effectively increase the grease injection space inside the self-aligning bearing, allowing more lubricating grease to be filled and improving the operation and maintenance cycle of the equipment.

[0063] Please further refer to Figure 12 , Figure 13 and Figure 14 , in some embodiments, the first annular seal cover 42 and / or the second annular seal cover 52 are fixedly connected to the outer ring 1 of the bearing by stamping or spin riveting, and are not likely to fall off even under large impacts.

[0064] Please further refer to Figure 2 and Figure 12 , in some embodiments, a first card slot 12 is provided on the inner side of the outer ring 1 of the bearing, and the outer peripheral edges of the first annular seal cover 42 and / or the second annular seal cover 52 are snap-fitted into the first card slot 12, facilitating the disassembly and assembly of the first annular seal cover 42 and / or the second annular seal cover 52 with the outer ring 1 of the bearing.

[0065] Please further refer to Figure 13 and Figure 14 , in some embodiments, a second card slot 13 is provided on the outer side of the outer ring 1 of the bearing, and the outer peripheral edges of the first annular seal cover 42 and / or the second annular seal cover 52 are snap-fitted into the second card slot 13, facilitating the disassembly and assembly of the first annular seal cover 42 and / or the second annular seal cover 52 with the outer ring 1 of the bearing.

[0066] Please further refer to Figure 2 and Figure 3 , in some embodiments, the first seal assembly 4 and / or the second seal assembly 5 are located outside the outer ring 1 of the bearing, and the first seal assembly 4 and / or the second seal assembly 5 are located outside the inner ring 2 of the bearing, which can avoid the contact between the second annular seal body 51 and the rolling elements 3 and increase the alignment angle of the self-aligning bearing.

[0067] Please further refer to Figure 2 and Figure 3 , in some embodiments, the first seal assembly 4, the second seal assembly 5, the outer ring 1 of the bearing and the inner ring 2 of the bearing enclose a receiving space 10 for accommodating the rolling elements 3, and the part inside the receiving space 10 outside the rolling elements 3 constitutes a grease injection space, which can effectively increase the grease injection space inside the self-aligning bearing, allow more lubricating grease to be filled, and improve the operation and maintenance cycle of the equipment.

[0068] Please further refer to in combination with Figure 1 、 Figure 12 and Figure 13 , in some embodiments, the first annular seal cover 42 and / or the second annular seal cover 52 are provided with an inclined surface 20 capable of preventing grass entanglement, so that weeds and straws are difficult to wind around the first annular seal cover 42 and / or the second annular seal cover 52.

[0069] Please further refer to in combination with Figure 12 、 Figure 13 and Figure 14 , in some embodiments, the self-aligning bearing further includes a cage for guiding the rolling elements 3, the rolling elements 3 are rollers or balls, and two sets of rolling elements 3 arranged in a circumferential array are provided on the cage.

[0070] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-aligning bearing, characterized in that: include: The outer ring of the bearing has an outer ring raceway on its inner surface; The inner ring of the bearing has an inner ring raceway on its outer surface; A plurality of rolling elements are disposed between the outer ring of the bearing and the inner ring of the bearing, and each of the rolling elements is rollingly supported in the outer ring raceway and the inner ring raceway respectively; and The sealing structure comprises a first sealing assembly and a second sealing assembly respectively arranged on both axial sides of the bearing outer ring; a first annular shoulder is extended from one side of the bearing inner ring in the axial direction, a first contact surface is arranged on the first annular shoulder, the first sealing assembly is connected to the bearing outer ring, and the first sealing assembly contacts the first contact surface; a second annular shoulder is extended from the other side of the bearing inner ring in the axial direction, a second annular shoulder is arranged on the second contact surface, the second sealing assembly is connected to the bearing outer ring, and the second sealing assembly contacts the second contact surface; Among them, the first contact surface is a convex first spherical surface, the second contact surface is a convex second spherical surface, the raceway surface of the outer ring raceway is a concave third spherical surface, the first spherical surface, the second spherical surface and the third spherical surface share a common center, and the center of the first spherical surface and the center of the second spherical surface are respectively consistent with or coincide with the bearing center of the self-aligning bearing.

2. The self-aligning bearing according to claim 1, characterized in that: The first sealing assembly includes a first annular sealing body in contact with the first contact surface and a first annular sealing cover connected to the outer ring of the bearing, the first annular sealing body is fixedly connected to the inner side of the first annular sealing cover, and a first avoidance gap is formed between the first annular sealing cover and the first contact surface; and / or, the second sealing assembly includes a second annular sealing body in contact with the second contact surface and a second annular sealing cover connected to the outer ring of the bearing, the second annular sealing body is fixedly connected to the inner side of the second annular sealing cover, and a second avoidance gap is formed between the second annular sealing cover and the second contact surface.

3. The self-aligning bearing according to claim 1, characterized in that: The first sealing assembly includes a first annular sealing body and a first annular sealing cover connected to the outer ring of the bearing, the first annular sealing body includes a first sealing main body connected to the first annular sealing cover and a first sealing lip arranged on the first sealing main body, and the first sealing lip contacts the first contact surface; and / or, the second sealing assembly includes a second annular sealing body and a second annular sealing cover connected to the outer ring of the bearing, the second annular sealing body includes a second sealing main body connected to the second annular sealing cover and a second sealing lip arranged on the second sealing main body, and the second sealing lip contacts the second contact surface.

4. The self-aligning bearing according to claim 3, characterized in that: The first sealing body is provided with a plurality of first sealing lips, which are arranged in sequence and spaced apart along the axial direction of the first annular sealing cover; and / or the second sealing body is provided with a plurality of second sealing lips, which are arranged in sequence and spaced apart along the axial direction of the second annular sealing cover.

5. The self-aligning bearing according to claim 3, characterized in that: The first annular sealing cover is configured as an outward-expanding metal skeleton structure, and the first annular sealing body is disposed in a first inner cavity inside the first annular sealing cover to limit the inner ring of the bearing; and / or, the second annular sealing cover is configured as an outward-expanding metal skeleton structure, and the second annular sealing body is disposed in a second inner cavity inside the second annular sealing cover to limit the inner ring of the bearing.

6. The self-aligning bearing according to claim 3, characterized in that: The first annular sealing cover and / or the second annular sealing cover are fixedly connected to the bearing outer ring by stamping or riveting.

7. The self-aligning bearing according to claim 1, characterized in that: The first sealing assembly and / or the second sealing assembly are located outside the outer ring of the bearing, and the first sealing assembly and / or the second sealing assembly are located outside the inner ring of the bearing.

8. The self-aligning bearing according to claim 1, characterized in that: The first sealing assembly, the second sealing assembly, the bearing outer ring and the bearing inner ring together form a containing space for accommodating the rolling element, and a portion of the containing space outside the rolling element constitutes a grease injection space.

9. The self-aligning bearing according to claim 1, characterized in that: The first annular sealing cover and / or the second annular sealing cover are provided with an inclined surface.

10. The self-aligning bearing according to any one of claims 1 to 9, characterized in that: The self-aligning bearing further comprises a cage for guiding the rolling elements, wherein the rolling elements are rollers or balls.

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