Oil seal and bearing

Abstract

The utility model provides an oil seal and a bearing. The oil seal comprises a main body, a boss part and a self-tightening ring, the boss part is located on the first sealing side of the oil seal and protrudes in the radial direction relative to the main body. The boss part is provided with an axial sealing lip protruding in the axial direction and a radial sealing lip protruding in the radial direction. The self-tightening ring is connected to the main body and can apply pressure to the boss part; and the pressure borne by the boss part generates axial pressure on the axial sealing lip and generates radial pressure on the radial sealing lip. By means of the arrangement, the boss part is designed in a protruding mode and provided with the sealing lips in the axial direction and the radial direction, namely, the sealing interval of the first sealing side of the oil seal is prolonged, in addition, the self-tightening ring has the pressure effect on the boss part, component force exists in the axial direction, and axial pressure acting on the axial sealing lips is formed; and component force is formed in the radial direction, radial pressure acting on the radial sealing lip is formed, axial sealing and radial sealing are achieved, and the problem that in the prior art, a bearing for the harmonic reducer is prone to sealing failure is solved.

Description

Technical Field

[0001] The present application relates to the technical field of bearings, and in particular to an oil seal and a bearing. Background Art

[0002] For most bearings, sealing is an important performance. In the cross roller bearing structure currently commonly used in harmonic reducers, usually only one skeleton oil seal is provided. In this way, the sealing function only relies on the skeleton oil seal, which leads to oil seepage and leakage after the harmonic reducer has been running for a long time. In addition, the operating conditions of the harmonic reducer are relatively complex, and sometimes the oil seepage and leakage will be more serious, which will lead to seal failure. Utility Model Content

[0003] In view of this, the present application provides an oil seal and a bearing to solve the problem of easy sealing failure of bearings used in harmonic reducers in the prior art.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] An oil seal, comprising:

[0006] main body;

[0007] a boss portion, located at a first sealing side of the oil seal and protruding radially relative to the main body, the boss portion being provided with an axial sealing lip protruding in the axial direction and a radial sealing lip protruding in the radial direction;

[0008] A self-tightening ring connected to the main body and capable of applying pressure to the boss portion;

[0009] The pressure exerted on the boss portion generates an axial pressure on the axial sealing lip and a radial pressure on the radial sealing lip.

[0010] Optionally, the main body comprises an inner ring, an outer ring and an end ring, the outer ring is located in the circumference of the inner ring and is arranged at intervals, and the end ring is connected between the inner ring and the outer ring;

[0011] The boss portion is located on the inner circumference side of the inner ring;

[0012] The self-tightening ring is connected to the outer peripheral side of the inner ring and is arranged away from the end ring.

[0013] Optionally, the self-tightening ring and the boss portion are radially opposite to each other.

[0014] Optionally, the self-tightening ring is a hoop spring.

[0015] Optionally, the second sealing side of the oil seal is a flat surface or a wavy surface.

[0016] A bearing comprises an inner ring, an outer ring and the oil seal described in any one of the above items, wherein the oil seal is sealed in a groove between the inner ring and the outer ring.

[0017] Optionally, the groove includes a main groove and an extension groove located radially inside the main groove, and the extension groove has a radial sealing surface and an axial sealing surface;

[0018] The boss portion extends into the extension groove, and the axial sealing lip abuts against the axial sealing surface, and the radial sealing lip abuts against the radial sealing surface.

[0019] Optionally, the inner ring includes:

[0020] An inner ring body, forming the radial sealing surface;

[0021] The inner ring retaining ring is located on the end surface of the inner ring body and is concentrically connected to the inner ring body, and the inner ring retaining ring forms the axial sealing surface.

[0022] Optionally, the inner ring includes:

[0023] Ring sheet department;

[0024] A raised portion, located at the edge of the ring portion and protruding axially relative to the ring portion;

[0025] Wherein, the inner ring body is provided with a step surface, the protrusion is partially pressed onto the step surface, and the ring sheet portion is pressed onto the end surface of the inner ring body.

[0026] Optionally, a sealing groove is provided on the surface of the inner ring body facing the inner ring retaining ring, a sealing ring is provided in the sealing groove, and the sealing ring is an O-ring or a star-shaped sealing ring.

[0027] The oil seal provided in the present application includes a main body, a boss portion and a self-tightening ring; the boss portion is located on the first sealing side of the oil seal and protrudes radially relative to the main body, and the boss portion is provided with an axial sealing lip protruding along the axial direction and a radial sealing lip protruding along the radial direction; the self-tightening ring is connected to the main body and can apply pressure to the boss portion; wherein the pressure exerted on the boss portion generates axial pressure on the axial sealing lip, and generates radial pressure on the radial sealing lip. With such arrangement, the boss portion forms a protruding design and is provided with sealing lips in both axial and radial directions, which is equivalent to extending the sealing interval of the first sealing side of the oil seal. In addition, the pressure of the self-tightening ring on the boss portion has a component force in the axial direction and forms an axial pressure acting on the axial sealing lip, so that the axial sealing lip can be in sealing contact with the axial sealing surface along the axial direction, and at the same time, there is a component force in the radial direction and forms a radial pressure acting on the radial sealing lip, so that the radial sealing lip can be in sealing contact with the radial sealing surface along the radial direction. In this way, the oil seal is applied to the assembly of the bearing, the sealing interval of the oil seal that plays a sealing role is extended, and both axial sealing and radial sealing can produce a better sealing effect, thereby solving the problem of easy sealing failure of bearings used for harmonic reducers in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the overall structure of the oil seal provided in the embodiment of the present application;

[0030] Figure 2 A sectional isometric view of an oil seal provided in an embodiment of the present application;

[0031] Figure 3 A sectional front view of an oil seal provided in an embodiment of the present application;

[0032] Figure 4 A schematic cross-sectional view of an oil seal provided in an embodiment of the present application;

[0033] Figure 5 A force analysis diagram of an oil seal provided in an embodiment of the present application;

[0034] Figure 6 A sectional isometric view of a bearing provided in an embodiment of the present application;

[0035] Figure 7 A schematic cross-sectional view of a bearing provided in an embodiment of the present application.

[0036] exist Figure 1-Figure 7 middle:

[0037] 01, oil seal; 02, outer ring; 03, inner ring body; 04, inner ring retaining ring; 05, sealing ring; 06, groove; 07, radial sealing surface; 08, axial sealing surface; 09, roller groove;

[0038] 041, ring piece portion; 042, raised portion;

[0039] 1. Inner ring; 2. Outer ring; 3. End ring; 4. Boss; 5. Self-tightening ring; 6. Dust lip; 7. Self-tightening ring groove; 8. Lip guard; 9. Frame; 10. Missing groove;

[0040] 41. Axial sealing lip; 42. Radial sealing lip. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Oil seals are ring-shaped components installed between relatively rotating mechanical parts. They have the function of separating the oil or grease on the inside from the dirt, dust, water, etc. on the outside.

[0043] like Figure 1-Figure 5 As shown, the embodiment of the present application provides an oil seal 01, which is suitable for the assembly of roller bearings, especially cross roller bearings, and is usually assembled in the groove 06 of the bearing. The oil seal 01 includes a main body, a boss portion 4 and a self-tightening ring 5; the boss portion 4 is annular, and the boss portion 4 is located on the first sealing side of the oil seal 01 and protrudes radially relative to the main body. The boss portion 4 is provided with an axial sealing lip 41 protruding in the axial direction and a radial sealing lip 42 protruding in the radial direction; the self-tightening ring 5 is connected to the main body and can apply pressure to the boss portion 4, and the pressure is directed toward the first sealing side; wherein, the pressure on the boss portion 4 generates axial pressure on the axial sealing lip 41, and generates radial pressure on the radial sealing lip 42. It should be noted that the pressure applied by the self-tightening ring 5 is due to the elastic deformation generated after it is connected to the main body.

[0044] In this way, the boss 4 forms a protruding design and is provided with sealing lips in both the axial and radial directions, which is equivalent to extending the sealing interval of the first sealing side of the oil seal 01. In addition, the pressure of the self-tightening ring 5 on the boss 4 has a component force in the axial direction and forms an axial pressure acting on the axial sealing lip 41, so that the axial sealing lip 41 can be sealed in contact with the axial sealing surface in the axial direction, and at the same time, there is a component force in the radial direction and forms a radial pressure acting on the radial sealing lip 42, so that the radial sealing lip 42 can be sealed in contact with the radial sealing surface in the radial direction. In this way, the oil seal 01 is applied to the assembly of the bearing, and the sealing interval of the oil seal 01 that plays a sealing role is extended, and both the axial sealing and the radial sealing can produce a better sealing effect, solving the problem of easy sealing failure of the bearing used for the harmonic reducer in the prior art. Not only that, it can also increase the reliability of the bearing, help reduce the maintenance and replacement frequency of the bearing, and extend the service life of the bearing, which is very helpful for the long-term continuous operation of the harmonic reducer.

[0045] Moreover, different from the conventional method of adding additional sealing rings to the bearings in the prior art, the present application adopts a different structural design for the oil seal 01 to compensate for the insufficient sealing of the bearings, overcome the rigidified thinking, and overcome the technical prejudice; and compared with the conventional method of adding additional sealing rings, the bearings provided by the present application have no additional assembly steps while strengthening the sealing, and will not increase the complexity of the bearing assembly. Specifically, the outer ring 02 of the bearing is fixed on the tooling, and the threaded connection is locked in the mounting hole. The inner ring of the bearing is concentrically matched with the outer ring 02 of the bearing, and the roller end faces are connected in the middle by a roller assembly. The oil seal 01 is installed in the groove 06 on the end faces of the inner ring of the bearing and the outer ring 02 of the bearing, and can be pressed in using a pressure tooling.

[0046] It should be noted that if Figure 5 As shown in FIG. 1 , the pressure applied by the self-tightening ring 5 is F, which is decomposed into a partial pressure Fr in the radial direction and a partial pressure Fa in the axial direction.

[0047] In a specific embodiment, the main body includes an inner ring 1, an outer ring 2, and an end ring 3. The outer ring 2 is located in the circumference of the inner ring 1 and is arranged at intervals. The end ring 3 is connected between the inner ring 1 and the outer ring 2, and the end ring 3 is located at the ends of the inner ring 1 and the outer ring 2. The boss portion 4 is located on the inner circumference of the inner ring 1, that is, the inner circumference of the oil seal 01 is the first sealing surface. The self-tightening ring 5 is connected to the outer circumference of the inner ring 1 and is arranged away from the end ring 3. The self-tightening ring 5 can generate a contraction force to form pressure on the inner ring 1.

[0048] In such a configuration, since the inner ring 1 and the outer ring 2 are connected at only one end, and the self-tightening ring 5 is connected to the inner ring 1 at a position away from the end ring 3, the pressure applied by the self-tightening ring 5 to the inner ring 1 is a contraction force, which will cause the end of the inner ring 1 to have a tendency to contract inward, naturally forming an oblique inward deformation, which is reflected as deflection in the cross section, so that the pressure applied by the self-tightening ring 5 forms two components of force in the axial and radial directions, thereby allowing the axial sealing lip 41 and the radial sealing lip 42 to obtain sealing pressure.

[0049] In addition to the above-mentioned case where the first sealing side is the inner peripheral side of the oil seal 01, it is also feasible for the first sealing side to be the outer peripheral side of the oil seal 01, that is, the boss portion 4 is arranged on the outer peripheral side of the outer ring 2, and the self-tightening ring 5 is connected to the outer ring 2 and can generate an expansion force to form pressure on the outer ring 2.

[0050] In a preferred embodiment, the self-tightening ring 5 and the boss portion 4 are directly opposite in the radial direction. This arrangement, through testing and verification, ensures that the pressure applied by the self-tightening ring 5 can generate partial pressure in the axial direction, and the partial pressure in the radial direction can fully act on the radial sealing lip 42, thereby achieving a better sealing effect.

[0051] In a preferred embodiment, a plurality of axial sealing lips 41 are provided and arranged radially; a plurality of radial sealing lips 42 are provided and arranged axially.

[0052] In addition, it is preferred to set the cross-sections of the axial sealing lip 41 and the radial sealing lip 42 to be obtuse angles. In this way, the sealing lips have stronger wear resistance and stronger extrusion resistance, and thus have better sealing effects.

[0053] In another preferred embodiment, the second sealing side of the oil seal 01 is a plane or a wavy surface, one of the first sealing side and the second sealing side is the outer peripheral side of the oil seal 01, and the other is the inner peripheral side of the oil seal 01. As shown in the figure, the first sealing side is the inner peripheral side of the oil seal 01, and the second sealing side is the outer peripheral side of the oil seal 01, that is, the outer peripheral side of the outer ring 2 is a plane or a wavy surface.

[0054] In another specific embodiment, the first sealing side is the inner peripheral side of the oil seal 01, and the self-tightening ring 5 is a hoop spring. In this way, the hoop spring has a tendency to contract radially inward, and can generate inward pressure on the boss portion 4 due to the contraction force to act on the first sealing side; when the oil seal 01 is installed in the bearing, the pressure of the axial sealing lip 41, the radial sealing lip 42 and the contraction force of the hoop spring generate a certain radial tightening force on the inner ring of the bearing. After a period of operation, the pressure will decrease rapidly, and the hoop spring can compensate for the self-tightening force of the oil seal 01 at any time.

[0055] In addition, in some cases, the self-tightening ring 5 can also be a rubber ring or a silicone ring with elastic deformation ability in the radial direction.

[0056] In another specific embodiment, a self-tightening ring groove 7 is provided on the outer peripheral side of the inner ring 1, a lip guard 8 is provided on the edge of the self-tightening ring groove 7, the self-tightening ring 5 is embedded in the self-tightening ring groove 7, and the lip guard 8 limits the self-tightening ring 5 in the self-tightening ring groove 7, thereby enhancing the assembly stability of the self-tightening ring 5 on the main body.

[0057] In a specific embodiment, a dust lip 6 is provided on the main body, and the dust lip 6 is located on the first sealing side and away from the boss portion 4, or in other words, the dust lip 6 is located at the outermost side in the axial direction, where the end ring 3 is located. In this way, the dust lip 6 can isolate dirt, dust, and water from the outside, provide a good sealing environment for the axial sealing lip 41 and the radial sealing lip 42, and reduce the loss of the sealing lips.

[0058] Furthermore, a concave missing groove 10 is provided in the circumference of the dust lip 6. The missing groove 10 can improve the deformation ease of the dust lip 6, so that the dust lip 6 is easy to deform, and the friction resistance at the dust lip 6 is reduced after installation.

[0059] Preferably, a skeleton 9 is provided in the outer ring 2 and the end ring 3, and the skeleton 9 is an L-shaped skeleton 9 made of metal, so as to form a skeleton oil seal, which can effectively bear the sealing function and also play a supporting role.

[0060] More specifically, the inner ring 1 , the outer ring 2 , the end ring 3 and the boss portion 4 are all made of elastic material and are integrally formed, and are formed on the skeleton 9 by vulcanization.

[0061] Based on the above-mentioned oil seal 01, the embodiment of the present application also provides a bearing, such as Figure 6-Figure 7 As shown, the bearing includes an inner ring, an outer ring 02 and the above-mentioned oil seal 01, a roller groove 09 for accommodating a roller assembly is formed between the inner ring and the outer ring 02, the oil seal 01 is sealed in the groove 06 between the inner ring and the outer ring 02, the shape of the groove 06 of the bearing is adapted to the oil seal 01, the axial sealing lip 41 is in close contact with the axial sealing surface of the groove 06, and the radial sealing lip 42 is in close contact with the radial sealing surface of the groove 06. Since the bearing has the above-mentioned oil seal 01, the beneficial effects of the bearing brought by the oil seal 01 can be found in the above content, which will not be repeated here.

[0062] In a specific embodiment, the groove 06 includes a main groove and an extension groove located radially inside the main groove, the extension groove has a radial sealing surface 07 and an axial sealing surface 08; the boss portion 4 extends into the extension groove, and the axial sealing lip 41 abuts against the axial sealing surface 08, and the radial sealing lip 42 abuts against the radial sealing surface 07.

[0063] With such arrangement, the conventional groove 06 is designed with a special shape, that is, it is extended radially inward to form an extended groove located on the inner side of the main groove. Since the oil seal 01 is also designed with a special shape, the boss portion extends into the extended groove for sealing. This is equivalent to extending the sealing range of the bearing, while also achieving radial and axial multi-pass sealing, reducing the sealing pressure of the oil seal 01, and ensuring sufficient lubrication of the bearing, thereby reducing the probability of oil seepage and leakage of the bearing.

[0064] Furthermore, the extension groove is located in the inner ring, and the inner ring includes an inner ring body 03 and an inner ring retaining ring 04; the inner ring body 03 forms a radial sealing surface 07; the inner ring retaining ring 04 is located at the end surface of the inner ring body 03 and is concentrically connected to the inner ring body 03, and the inner ring retaining ring 04 forms an axial sealing surface 08. That is, after the inner ring body 03 and the inner ring retaining ring 04 are assembled in the axial direction, an extension groove is formed between the two. The dust lip 6 abuts against the inner ring retaining ring 04.

[0065] With such arrangement, the inner ring is designed to be split and can be assembled. Before the inner ring retaining ring 04 is assembled, the extension groove is completely exposed. Even if the oil seal 01 is designed to be a special-shaped structure, it can be smoothly installed. Finally, the inner ring retaining ring 04 can be installed, making the assembly process of each component in the bearing easy to carry out.

[0066] Of course, since the oil seal 01 has good elasticity, in addition to the above method, it is also feasible that the inner ring is an integrated structure, and the oil seal 01 is pressed into the groove 06 by deformation.

[0067] In a more specific embodiment, the inner ring retaining ring 04 includes an integrally formed ring sheet portion 041 and a protruding portion 042; the protruding portion 042 is located at the edge of the ring sheet portion 041 and protrudes axially relative to the ring sheet portion 041; wherein the inner ring body 03 is provided with a step surface, the protruding portion 042 is partially pressed on the step surface, and the ring sheet portion 041 is pressed on the end surface of the inner ring body 03. The axial sealing surface 08 is formed on the protruding portion 042.

[0068] In this arrangement, the annular portion 041 is connected to the surface of the inner ring body 03, and the raised portion 042 is used to extend into the interior along the axial direction, so that multiple limiting fits are formed between the inner ring retaining ring 04 and the inner ring body 03, and the connection relationship is reliable.

[0069] In a preferred embodiment, a sealing groove is provided on the surface of the inner ring body 03 facing the inner ring retaining ring 04, and a sealing ring 05 is provided in the sealing groove. The sealing ring 05 is an O-shaped sealing ring or a star-shaped sealing ring. Specifically, it can be on the surface of the ring sheet portion of the inner ring body 03 facing the inner ring retaining ring 04, and / or, on the surface of the raised portion of the inner ring body 03 facing the inner ring retaining ring 04. In this way, another sealing barrier is provided between the inner ring body 03 and the inner ring retaining ring 04, further improving the sealing reliability of the bearing.

[0070] Based on the above-mentioned bearing implementation method, the bearing assembly process can be carried out as follows: the outer ring 02 is fixed on the tooling and locked in the installation hole through a threaded connection; the inner ring body 03 is concentrically matched with the outer ring 02, and the roller end faces are connected with a roller assembly in the middle; the oil seal 01 is pressed into the groove 06 using a pressure tooling, and the radial sealing lip 42 abuts against the inner ring body 03; finally, the inner ring retaining ring 04 is installed, and the inner ring retaining ring 04 abuts against the axial sealing lip 41; at the same time, the sealing ring 05 abuts against the inner ring retaining ring 04, completing the sealing between the inner ring body 03 and the inner ring retaining ring 04, and the assembly is completed.

[0071] In a specific embodiment, the bearing mentioned above may be a cross roller bearing suitable for a harmonic reducer.

[0072] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0073] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0074] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0075] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0076] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0077] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. An oil seal, characterized in that: include: main body; A boss portion (4) is located on a first sealing side of the oil seal and protrudes radially relative to the main body, the boss portion (4) being provided with an axial sealing lip (41) protruding in the axial direction and a radial sealing lip (42) protruding in the radial direction; A self-tightening ring (5) connected to the main body and capable of applying pressure to the boss portion (4); The pressure exerted on the boss portion (4) generates axial pressure on the axial sealing lip (41) and radial pressure on the radial sealing lip (42).

2. The oil seal according to claim 1, characterized in that: The main body comprises an inner ring (1), an outer ring (2), and an end ring (3); the outer ring (2) is located in the circumference of the inner ring (1) and is arranged at intervals; and the end ring (3) is connected between the inner ring (1) and the outer ring (2); The boss portion (4) is located on the inner circumference of the inner ring (1); The self-tightening ring (5) is connected to the outer peripheral side of the inner ring (1) and is arranged away from the end ring (3).

3. The oil seal according to claim 1, characterized in that: The self-tightening ring (5) and the boss portion (4) are directly opposite to each other in the radial direction.

4. The oil seal according to claim 1, characterized in that: The self-tightening ring (5) is a hoop spring.

5. The oil seal according to claim 1, characterized in that: The second sealing side of the oil seal is a flat surface or a wavy surface.

6. A bearing, characterized in that: It comprises an inner ring, an outer ring (02) and an oil seal (01) according to any one of claims 1 to 5, wherein the oil seal (01) is sealed in a groove (06) between the inner ring and the outer ring (02).

7. The bearing according to claim 6, characterized in that The groove (06) comprises a main groove and an extension groove located radially inside the main groove, and the extension groove has a radial sealing surface (07) and an axial sealing surface (08); The boss portion (4) extends into the extension groove, and the axial sealing lip (41) abuts against the axial sealing surface (08), and the radial sealing lip (42) abuts against the radial sealing surface (07).

8. The bearing according to claim 7, characterized in that The inner ring comprises: An inner ring body (03) forming the radial sealing surface (07); The inner ring retaining ring (04) is located on the end surface of the inner ring body (03) and is concentrically connected to the inner ring body (03), and the inner ring retaining ring (04) forms the axial sealing surface (08).

9. The bearing according to claim 8, characterized in that The inner ring retaining ring (04) comprises: Ring sheet portion (041); a raised portion (042) located at the edge of the ring-shaped portion (041) and protruding axially relative to the ring-shaped portion (041); The inner ring body (03) is provided with a step surface, the protrusion (042) is partially crimped on the step surface, and the ring sheet portion (041) is crimped on the end surface of the inner ring body (03).

10. The bearing according to claim 8, characterized in that A sealing groove is provided on the surface of the inner ring body (03) facing the inner ring retaining ring (04), a sealing ring (05) is provided in the sealing groove, and the sealing ring (05) is an O-type sealing ring or a star-shaped sealing ring.

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