Cylindrical roller bearing

Abstract

The utility model belongs to the technical field of bearings and provides a cylindrical roller bearing which comprises a body assembly and a sealing assembly, and the body assembly comprises an inner ring body, an outer ring body and a rolling body assembled between the inner ring body and the outer ring body. The sealing assembly comprises a multi-lip sealing ring and a dip angle sealing ring which are elastically assembled between the inner ring body and the outer ring body, and the multi-lip sealing ring and the dip angle sealing ring are arranged on the two axial sides of the rolling body respectively. The multi-lip sealing ring and the inclination angle sealing ring are arranged on the two axial sides of the rolling body, so that the sealing effect of the cylindrical roller bearing can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bearings, and in particular relates to a cylindrical roller bearing. Background Art

[0002] At present, common bearings on the market are usually rarely sealed. Such bearings cannot prevent the erosion of dust, moisture, and foreign matter when in use. In order to adapt to the harsh working environment of construction machinery, sealed bearings came into being. Such sealed bearings close the side openings between the inner ring body and the outer ring body by adding sealing rings, thereby preventing dust, moisture, and foreign matter from entering and avoiding grease leakage.

[0003] However, the sealing rings of existing sealed bearings generally use a single-lip abutment method for sealing. The contact area of ​​the single-lip sealing lip is limited, and it is easy for the sealing lip and the ring body to have poor contact during use, resulting in a poor sealing effect. Utility Model Content

[0004] In view of the above-mentioned defects or shortcomings, the utility model provides a cylindrical roller bearing, aiming to solve the technical problem that the sealing effect of the sealing ring of the existing sealed bearing is poor.

[0005] To achieve the above-mentioned purpose, the utility model provides a cylindrical roller bearing, wherein the cylindrical roller bearing includes a body component and a sealing component, the body component includes an inner ring body, an outer ring body and a rolling body assembled between the inner ring body and the outer ring body, the sealing component includes a multi-lip sealing ring and an angle sealing ring elastically assembled between the inner ring body and the outer ring body, and the multi-lip sealing ring and the angle sealing ring are arranged on both axial sides of the rolling body.

[0006] In an embodiment of the utility model, a first inner rib and a first outer rib are respectively provided on one side of the inner ring body and the outer ring body corresponding to the multi-lip sealing ring, and the multi-lip sealing ring is installed between the first inner rib and the first outer rib with interference fit.

[0007] In an embodiment of the utility model, a first inner circular end sealing lip is provided on the inner circular end of the multi-lip sealing ring, and a first outer circular end sealing lip is provided on the outer circular end. One of the first inner circular end sealing lip and the first outer circular end sealing lip includes an inner sealing lip portion and an outer sealing lip portion extending to both sides of the axial direction respectively, and the outer sealing lip portion is provided with a lip body fitting cover for elastically fitting with the first inner rib or the first outer rib at the corresponding end.

[0008] In an embodiment of the utility model, a first inner sealing groove is provided on the first inner retaining edge, and the first inner circular end sealing lip includes an inner sealing lip and an outer sealing lip, the tooth top of the inner sealing lip elastically abuts against the inner side wall of the first inner sealing groove, and the lip body of the outer sealing lip elastically fits against the outer shoulder of the first inner sealing groove.

[0009] In an embodiment of the utility model, the inner sealing lip has multiple layers, the multiple layers of inner sealing lips are spaced apart in the radial direction, and the tooth tops of at least one layer of inner sealing lips are in contact with the inner wall of the first inner sealing groove at the same time.

[0010] In an embodiment of the present invention, the cross-sectional shape of the inner sealing lip is tooth-shaped, and the tooth tops of the inner sealing lip are used to abut against the inner ring body or the outer ring body at the corresponding end.

[0011] In an embodiment of the utility model, a second outer rib is provided on one side of the outer ring body close to the angled sealing ring, and an oblique chamfer is provided on one side of the inner ring body close to the angled sealing ring. The angled sealing ring is installed between the second outer rib and the oblique chamfer with interference fit.

[0012] In an embodiment of the utility model, a second outer sealing groove is provided on the second outer rib, and a second outer circular end sealing lip is provided on the outer circular end of the angled sealing ring. The second outer circular end sealing lip is used to extend into and elastically interfere with the second outer sealing groove.

[0013] In an embodiment of the utility model, a second inner circular end sealing lip is provided on the inner circular end of the angled sealing ring, and the second inner circular end sealing lip is provided with a fitting surface for sealingly fitting with the inclined surface of the chamfer.

[0014] In an embodiment of the utility model, the multi-lip sealing ring and the angle sealing ring both include an elastic rubber body and a ring body frame arranged in the elastic rubber body and used to support the elastic rubber body, and the inner circular end and the outer circular end of the elastic rubber body are elastically interfered with the inner ring body and the outer ring body on the corresponding side respectively.

[0015] Through the above technical solution, the cylindrical roller bearing provided by the embodiment of the utility model has the following beneficial effects:

[0016] Both the multi-lip sealing ring and the angled sealing ring are ring structures and include an inner circular end and an outer circular end. In the multi-lip sealing ring, at least one of the inner circular end and the outer circular end is provided with a multi-layer sealing lip, which can provide multi-layer protection, thereby ensuring the sealing effect of the bearing and preventing grease leakage or dust and foreign matter from the outside air from invading. For the convenience of installation, a tilt angle is set on one side of the cylindrical roller bearing, and by setting a tilted sealing ring, the tilted side of the cylindrical roller bearing can be sealed. In summary, by setting a multi-lip sealing ring and an angled sealing ring on both axial sides of the rolling body, the sealing effect of the cylindrical roller bearing can be increased.

[0017] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic cross-sectional structure diagram of a cylindrical roller bearing in an embodiment of the utility model;

[0020] Figure 2 According to the embodiment of the present utility model Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0021] Figure 3 According to the embodiment of the present utility model Figure 1 A schematic diagram of the enlarged structure at B in the middle;

[0022] Figure 4 According to the embodiment of the present utility model Figure 1 Schematic diagram of the enlarged structure at C in the middle;

[0023] Figure 5 is a schematic structural diagram of a multi-lip sealing ring according to an embodiment of the utility model;

[0024] Figure 6 It is a structural schematic diagram of the angled sealing ring in the embodiment of the utility model.

[0025] Description of Reference Numerals

[0026] 11 Inner ring body 111 First inner rib

[0027] 112 chamfer 12 outer ring

[0028] 121 first outer rib 122 second outer rib

[0029] 13 Rolling element 21 Multi-lip seal ring

[0030] 211 First inner circular end sealing lip 211a Inner sealing lip

[0031] 211b Outer sealing lip 212 First outer circular end sealing lip

[0032] 22 Angle sealing ring 221 Fitting surface

[0033] 222 Second outer circular end sealing lip 223 Second inner circular end sealing lip

[0034] 23 elastic rubber body 24 ring body skeleton

[0035] 3 Cage body 4 Cage beam DETAILED DESCRIPTION

[0036] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0037] The cylindrical roller bearing of the present invention is described below with reference to the accompanying drawings.

[0038] The utility model provides a cylindrical roller bearing, such as Figure 1 and Figure 2 As shown, cylindrical roller bearings include:

[0039] A body assembly, comprising an inner ring body 11, an outer ring body 12, and a rolling body 13 assembled between the inner ring body 11 and the outer ring body 12; and

[0040] The sealing assembly comprises a multi-lip sealing ring 21 and an angle sealing ring 22 elastically assembled between the inner ring body 11 and the outer ring body 12 . The multi-lip sealing ring 21 and the angle sealing ring 22 are arranged on both axial sides of the rolling body 13 .

[0041] The multi-lip sealing ring 21 and the angled sealing ring 22 are both ring structures and include an inner circular end and an outer circular end. In the multi-lip sealing ring 21, at least one of the inner circular end and the outer circular end is provided with a multi-layer sealing lip, which can provide multi-layer protection, thereby ensuring the sealing effect of the bearing and preventing grease leakage or dust and foreign matter from the outside air from invading. For the convenience of installation, an angle is set on one side of the cylindrical roller bearing, and by setting the angled sealing ring 22, the angled side of the cylindrical roller bearing can be sealed. In summary, by setting the multi-lip sealing ring 21 and the angled sealing ring 22 on both axial sides of the rolling element 13, the sealing effect of the cylindrical roller bearing can be increased.

[0042] like Figure 1 As shown, in an embodiment of the present utility model, a first inner rib 111 and a first outer rib 121 are respectively provided on one side of the inner ring body 11 and the outer ring body 12 corresponding to the multi-lip sealing ring 21, and the multi-lip sealing ring 21 is installed between the first inner rib 111 and the first outer rib 121 with interference fit.

[0043] Since the inner rib and the outer rib protrude toward each other, the inter-ring gap for the installation of the multi-lip sealing ring 21 is small, resulting in the need to reduce the radial height of the sealing lip to ensure the installation of the multi-lip sealing ring 21. The reduction in the radial height of the sealing lip can easily lead to poor contact of the sealing lip when the bearing moves. Therefore, in order to ensure the sealing effect on the rib side, the multi-lip sealing ring 21 can be set to a multi-lip sealing ring 21. The multi-lip sealing ring 21 can increase the number of sealing layers, thereby avoiding the intrusion of external dust, moisture, foreign matter or internal grease leakage due to poor contact of the sealing lips.

[0044] like Figure 1 and Figure 2 As shown, in an embodiment of the utility model, a first inner circular end sealing lip 211 is provided on the inner circular end of the multi-lip sealing ring, and a first outer circular end sealing lip 212 is provided on the outer circular end, and one of the first inner circular end sealing lip 211 and the first outer circular end sealing lip 212 includes an inner sealing lip 211a and an outer sealing lip 211b extending to both sides of the axial direction respectively, and the outer sealing lip 211b is provided with a lip body covering surface for elastically fitting with the first inner rib 111 or the first outer rib 121 at the corresponding end. The inner sealing lip 211a and the outer sealing lip 211b can provide at least two layers of protection. First, the sealing of the inner sealing lip 211a can prevent the leakage of grease in the bearing, and avoid the accumulation of grease at the outer sealing lip 211b, which may cause dust and foreign matter to easily adhere to the side edge of the bearing. Second, the fitting seal of the lip body on the outer sealing lip 211b can ensure that the outer sealing lip 211b and the ring body at the corresponding end always maintain a good contact state, avoiding poor contact of the outer sealing lip 211b when the bearing is moving, and avoiding the invasion of dust, moisture, and foreign matter from the outside. Through at least two layers of protection, the sealing effect of the cylindrical roller bearing can be enhanced.

[0045] like Figure 2 As shown, in an embodiment of the utility model, a first inner sealing groove is provided on the first inner rib 111, and the first inner circular end sealing lip 211 includes an inner sealing lip 211a and an outer sealing lip 211b, that is, the inner sealing lip 211a and the outer sealing lip 211b are arranged on the inner circular end of the multi-lip sealing ring 21, the tooth top of the inner sealing lip 211a elastically abuts against the inner side wall of the first inner sealing groove, and the lip body of the outer sealing lip 211b elastically fits against the outer shoulder of the first inner sealing groove.

[0046] For standard bearings, the national standard stipulates that the sealing ring moves with the outer ring body 12 relative to the inner ring body 11, that is, the assembly clamping force between the first outer circular end sealing lip 212 and the outer ring body 12 in the multi-lip sealing ring 21 is greater than the assembly clamping force between the first inner circular end sealing lip 211 and the inner ring body 11. Since the assembly clamping force of the first inner circular end sealing lip 211 is small, it is more likely that grease leakage or foreign matter intrusion will occur at the first outer circular end sealing lip 212. In the embodiment of the utility model, it is preferred to set the inner sealing lip 211a and the outer sealing lip 211b on the inner circular end of the multi-lip sealing ring 21. Of course, for some non-standard bearings, the inner sealing lip 211a and the outer sealing lip 211b can also be set on the outer circular end of the multi-lip sealing ring 21.

[0047] The inner sealing lip 211a is mainly used to prevent the grease from leaking out. By making the inner sealing lip 211a butt against the inner side wall of the first inner sealing groove at the corresponding end, it can be ensured that the inner sealing lip 211a can contact the inner side wall of the groove with the lip tip, and can avoid the excessive elastic force of the radial interference fit of the multi-lip sealing ring 21, which leads to the severe deformation of the tooth top of the inner sealing lip 211a, thereby ensuring the sealing effect of the grease, wherein the interference fit amount between the inner sealing lip 211a and the inner side wall of the groove is preferably 0.1-0.3mm. The outer sealing lip 211b is mainly used to prevent the intrusion of dust, moisture, and foreign matter from the outside. The outer sealing lip 211b is set to elastically fit with the outer shoulder of the first inner sealing groove at the corresponding end, so that most of the radial elastic pressure generated by the interference fit of the multi-lip sealing ring 21 can be borne by the outer shoulder of the first inner sealing groove, thereby ensuring reliable compression between the outer sealing lip 211b and the outer shoulder of the first inner sealing groove. By increasing the pressing force between the outer sealing lip 211b and the outer shoulder of the first inner sealing groove, the intrusion of dust, moisture and foreign matter from the outside can be effectively prevented.

[0048] like Figure 2 As shown, in the embodiment of the present invention, the inner sealing lip 211a has multiple layers, and the multiple layers of inner sealing lips 211a are spaced apart in the radial direction, and the tooth top of at least one layer of inner sealing lips 211a contacts the inner wall of the first inner sealing groove. By providing multiple layers of inner sealing lips 211a, a multi-layer barrier can be formed, thereby ensuring the reliability of grease sealing.

[0049] In the embodiment of the present invention, the cross-sectional shape of the inner sealing lip 211a is tooth-shaped, such as sawtooth or other tooth-shaped, and the tooth top of the inner sealing lip 211a is used to abut against the inner ring body 11 or the outer ring body 12 at the corresponding end. By setting the shape of the inner sealing lip 211a to be tooth-shaped, the sealing effect of the inner sealing lip 211a on the grease can be increased, and the contact friction between the inner sealing lip 211a and the corresponding end ring body can be reduced, so that the ring body is easier to rotate relative to the inner sealing lip 211a.

[0050] like Figure 3 and Figure 5 As shown, in the embodiment of the utility model, a first outer sealing groove is provided on the first outer rib 121, and the first outer circular end sealing lip 212 extends into and is elastically clamped in the first outer sealing groove. By clamping the outer circular end in the first outer sealing groove at the corresponding end, the multi-lip sealing ring 21 can be fixed to prevent the multi-lip sealing ring 21 from moving relative to the outer ring body 12. At the same time, the first outer sealing groove can also limit the axial movement of the multi-lip sealing ring 21.

[0051] In the embodiment of the present application, the outer circular end and the inner circular end of the multi-lip sealing ring 21 are both made of elastic rubber material, and preferably nitrile rubber material. The diameter of the outer circular end of the multi-lip sealing ring 21 needs to be slightly larger than the maximum diameter of the first outer sealing groove of the outer ring body 12, and the clamping force between the two needs to ensure that the multi-lip sealing ring 21 and the outer ring body 12 remain stationary during operation, and the minimum diameter of the outer sealing lip 211b of the multi-lip sealing ring 21 needs to be slightly smaller than the outer shoulder diameter of the first inner sealing groove on the inner ring body 11, and the assembly clamping force between the two needs to ensure that the multi-lip sealing ring 21 can be flexibly rotated relative to the inner ring body 11 without getting stuck. Preferably, the difference between the outer shoulder diameter of the first sealing groove and the minimum diameter of the outer sealing lip 211b of the multi-lip sealing ring 21 can be maintained in the range of 0.4-0.8mm.

[0052] like Figure 1 and Figure 6 As shown, in the embodiment of the utility model, the outer ring body 12 is further provided with a second outer rib 122 on one side close to the angled sealing ring 22, the inner ring body 11 is provided with an oblique chamfer 112 on one side close to the angled sealing ring 22, and the angled sealing ring 22 is installed with an interference fit between the second outer rib 122 and the oblique chamfer 112. The oblique chamfer 112 is provided to facilitate the installation of the rolling element 13, and the angled sealing ring 22 can seal the chamfered side of the bearing.

[0053] like Figure 1 , Figure 4 and Figure 6 As shown in the embodiment of the utility model, the second outer rib 122 is provided with a second outer sealing groove, and the outer circular end of the angled sealing ring 22 is provided with a second outer circular end sealing lip 222, which is used to extend into and elastically interfere with the second outer sealing groove. The inner circular end of the angled sealing ring 22 is provided with a second inner circular end sealing lip 223, and the second inner circular end sealing lip 223 is provided with a fitting surface 221 that is sealed and fitted with the inclined surface of the chamfer 112. By extending the second outer circular end sealing lip 222 into the second outer sealing groove, the angled sealing ring 22 can be limited and fixed to prevent the angled sealing ring 22 from axial movement, and by providing the fitting surface 221, the contact area between the second inner circular end sealing lip 223 and the chamfer 112 can be increased to ensure the stability of the inner circular end sealing contact.

[0054] In the embodiment of the present application, the inclination angle of the bonding surface 221 is the same as the inclination angle of the chamfer 112, the parallelism error does not exceed ±1°, and the thickness of the contact area of ​​the bonding surface 221 is preferably within the range of 2mm±0.5mm.

[0055] In the embodiment of the present application, the interference fit between the second inner circular end sealing lip 223 and the chamfer 112 may be 0-0.5 mm.

[0056] In the embodiment of the present application, the angled sealing ring 22 is a wide sealing ring, which widens the width of the sealing ring and the width of the ring body frame 24, thereby achieving a better sealing effect.

[0057] In the embodiment of the utility model, the multi-lip sealing ring 21 and the angle sealing ring 22 both include an elastic rubber body 23 and a ring body skeleton 24 disposed in the elastic rubber body 23 and used to support the elastic rubber body 23. The inner and outer circular ends of the elastic rubber body 23 are elastically interference fit with the inner ring body 11 and the outer ring body 12 on the corresponding sides, respectively. The elastic rubber body 23 can be integrally injection molded and formed with an installation cavity for installing the ring body skeleton 24. The ring body skeleton 24 is installed in the installation cavity and can provide sufficient support force for the elastic rubber body 23. The elastic rubber body 23 can be made of materials such as nitrile rubber, improved nitrile rubber, polyacrylate rubber (ACM), hydrogenated nitrile rubber (HNBR) and fluororubber (FPM).

[0058] In an embodiment of the utility model, a retaining frame body 3 and a retaining frame beam 4 are further provided between the multi-lip sealing ring 21 and the rolling element 13, and between the angle sealing ring 22 and the rolling element 13. The retaining frame body 3 and the retaining frame beam 4 are used to ensure the circumferential distance between two adjacent rolling elements 13 and guide the movement of all rolling elements 13.

[0059] In summary, the cylindrical roller bearing in the present invention not only has a good sealing effect, but also the inner ring body 11 and the outer ring body 12 are easy to process, and the sealing rings on both sides are easy to install.

[0060] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0063] Although the embodiments of the present invention have been described above, it is understandable that the above embodiments are exemplary and cannot be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A cylindrical roller bearing, characterized in that: The cylindrical roller bearing comprises: A body assembly, comprising an inner ring body (11), an outer ring body (12), and a rolling body (13) assembled between the inner ring body (11) and the outer ring body (12); and The sealing assembly comprises a multi-lip sealing ring (21) and an angle sealing ring (22) elastically assembled between the inner ring body (11) and the outer ring body (12); the multi-lip sealing ring (21) and the angle sealing ring (22) are arranged on both axial sides of the rolling body (13).

2. The cylindrical roller bearing according to claim 1, characterized in that: The inner ring body (11) and the outer ring body (12) are respectively provided with a first inner rib (111) and a first outer rib (121) on one side corresponding to the multi-lip sealing ring (21); the multi-lip sealing ring (21) is installed between the first inner rib (111) and the first outer rib (121) in an interference fit.

3. The cylindrical roller bearing according to claim 2, characterized in that: The inner circular end of the multi-lip sealing ring is provided with a first inner circular end sealing lip (211), and the outer circular end is provided with a first outer circular end sealing lip (212); one of the first inner circular end sealing lip (211) and the first outer circular end sealing lip (212) comprises an inner sealing lip portion (211a) and an outer sealing lip portion (211b) extending axially to both sides respectively; the outer sealing lip portion (211b) is provided with a lip body contact surface for elastically fitting with the first inner rib (111) or the first outer rib (121) at the corresponding end.

4. The cylindrical roller bearing according to claim 3, characterized in that: A first inner sealing groove is provided on the first inner retaining edge (111), and the first inner circular end sealing lip (211) includes the inner sealing lip portion (211a) and the outer sealing lip portion (211b), the tooth tip of the inner sealing lip portion (211a) elastically abuts against the inner side wall of the first inner sealing groove, and the lip body of the outer sealing lip portion (211b) elastically fits against the outer shoulder of the first inner sealing groove.

5. The cylindrical roller bearing according to claim 4, characterized in that: The inner sealing lip (211a) has multiple layers, and the multiple layers of the inner sealing lip (211a) are distributed at intervals in the radial direction, and the tooth tops of at least one layer of the inner sealing lip (211a) are in contact with the inner wall of the first inner sealing groove at the same time.

6. The cylindrical roller bearing according to claim 3, characterized in that: The cross-sectional shape of the inner sealing lip (211a) is tooth-shaped, and the tooth top of the inner sealing lip (211a) is used to abut against the inner ring body (11) or the outer ring body (12) at the corresponding end.

7. The cylindrical roller bearing according to any one of claims 1 to 6, characterized in that: The outer ring body (12) is also provided with a second outer rib (122) on the side close to the angled sealing ring (22), and the inner ring body (11) is provided with an oblique chamfer (112) on the side close to the angled sealing ring (22), and the angled sealing ring (22) is installed between the second outer rib (122) and the oblique chamfer (112) by interference fit.

8. The cylindrical roller bearing according to claim 7, characterized in that: A second outer sealing groove is provided on the second outer rib (122), and a second outer circular end sealing lip (222) is provided on the outer circular end of the angled sealing ring (22). The second outer circular end sealing lip (222) is used to extend into and be elastically interference-engaged in the second outer sealing groove.

9. The cylindrical roller bearing according to claim 8, characterized in that A second inner circular end sealing lip (223) is provided on the inner circular end of the angled sealing ring (22), and the second inner circular end sealing lip (223) is provided with a fitting surface (221) for sealingly fitting with the inclined surface of the chamfer (112).

10. The cylindrical roller bearing according to any one of claims 1 to 6, characterized in that: The multi-lip sealing ring (21) and the angled sealing ring (22) both comprise an elastic rubber body (23) and a ring body frame (24) disposed inside the elastic rubber body (23) and used to support the elastic rubber body (23); the inner circular end and the outer circular end of the elastic rubber body (23) are elastically interference-held against the inner ring body (11) and the outer ring body (12) on the corresponding side, respectively.

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