Sealing device

Abstract

Provided is a sealing device (10) capable of suppressing the deterioration of sealing performance and suppressing separation between a first member (11) and a second member (20). The sealing device (10) includes a first member (11) to be attached to an outer member, and a second member (20) to be attached to an inner member. The first member (11) includes: a first cylindrical portion (13) disposed on an inner peripheral side of the outer member; a first circular ring portion (14) extending radially inward from an annular space S-side end portion of the first cylindrical portion (13); and a seal portion (15) provided with a non-contact lip (16) fixed to the first circular ring portion (14) and disposed in non-contact relation to the second member (20). The second member (20) includes: a second cylindrical portion (22) to be fitted into an outer peripheral surface of the inner member; a second circular ring portion (23) connected to the second cylindrical portion (22); and a third cylindrical portion (24) connected to the second circular ring portion (23) to form a labyrinth seal with the first cylindrical portion (13). The third cylindrical portion (24) has, at the annular space S-side end portion, a bent portion (25) that is bent radially inward, and the non-contact lip (16) and the bent portion (25) are provided so as to partially overlap each other when viewed in an axial direction.

Description

Sealing device

[0001] The present invention relates to a sealing device for sealing an annular space between an outer member and an inner member that rotate coaxially relative to each other.

[0002] Conventionally, a sealing device in which a first member attached to an outer member and a second member attached to an inner member are combined is known. For example, in Patent Document 1 below, a packing seal type sealing device is disclosed in which a seal member including a core metal member having an L-shaped cross section and an elastic member fixed to the core metal member is combined with a slinger having a substantially L-shaped cross section.

[0003] Japanese Unexamined Patent Application Publication No. 2010-190323

[0004] In the sealing device described in Patent Document 1, when the reaction force of the radial lip that contacts the cylindrical portion on the inner diameter side of the slinger is small, there is a concern that the radial lip cannot hold the slinger and the seal member and the slinger may separate during conveyance or the like. When this sealing device separates, if the axial lip that contacts the flange portion of the slinger and seals catches on the bent extending portion that inclines toward the inner diameter side provided on the outer diameter side of the slinger and a scratch occurs on the surface, there is a concern that it will have an adverse effect on the sealing performance.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a sealing device that can suppress a decrease in sealing performance and suppress separation between the first member and the second member.

[0006] To achieve the above objective, configuration 1 of the sealing device of the present invention is a sealing device for sealing an annular space between an outer member and an inner member that rotate relatively coaxially, comprising a first member attached to the outer member and a second member attached to the inner member, wherein the first member comprises a first cylindrical portion disposed on the inner circumference side of the outer member, a first ring portion extending inward from the annular space side end of the first cylindrical portion, and a sealing portion having a non-contact lip fixed to the first ring portion and disposed non-contact with the second member, wherein the second member comprises a second cylindrical portion fitted to the outer circumference surface of the inner member, a second ring portion connected to the second cylindrical portion, and a third cylindrical portion connected to the second ring portion and forming a labyrinth seal between itself and the first cylindrical portion, wherein the third cylindrical portion has a bent portion bent inward at the annular space side end, and the non-contact lip and the bent portion are provided such that a portion of them overlaps with each other when viewed in the axial direction.

[0007] The following descriptions of embodiments disclose that the sealing device according to the present invention may have the following dependent configurations: <Configuration 2> In Configuration 1, the second member is provided with a core metal, and the bent portion may be formed by bending the core metal. <Configuration 3> In Configuration 1, the second member is provided with a thermoplastic elastic body, and the bent portion may be formed by bending the heated elastic body. <Configuration 4> In any one of Configurations 1 to 3, a labyrinth seal communicating with the labyrinth seal formed between the first cylindrical portion and the third cylindrical portion may be formed between the third cylindrical portion and the non-contact lip. <Configuration 5> In any one of Configurations 1 to 3, a labyrinth seal communicating with the labyrinth seal formed between the first cylindrical portion and the third cylindrical portion may be formed between the bent portion and the first ring portion. <Configuration 6> In any one of Configurations 1 to 5, the tip of the non-contact lip is bent toward the outer diameter and is formed to overlap with the bent portion when viewed in the axial direction, and may be configured to be deformable when pressed by the bent portion during assembly of the first member and the second member.

[0008] Because the sealing device of the present invention has the above-described configuration, it can suppress a decrease in sealing performance and prevent separation between the first member and the second member.

[0009] This is a schematic longitudinal cross-sectional view showing an example of a bearing device to which a sealing device according to one embodiment of the present invention is attached. This is an enlarged view of section X in Figure 1, which is a schematic longitudinal cross-sectional view schematically showing a sealing device according to one embodiment. (a) and (b) are schematic longitudinal cross-sectional views showing a state in which multiple sealing devices are stacked. (a) is a schematic longitudinal cross-sectional view schematically showing a modified example of the sealing device, and (b) and (c) are schematic longitudinal cross-sectional views showing the formation of a bent portion in chronological order. (a) and (b) are schematic longitudinal cross-sectional views schematically showing modified examples of the sealing device, respectively.

[0010] An example of a sealing device according to this embodiment will be described below with reference to the drawings. Note that some of the detailed reference numerals used in other figures have been omitted in some of the figures. In each figure, the dashed lines of the seal portion and elastic body indicate the shape before elastic deformation. Figures 1 to 3 show an example of a sealing device according to this embodiment and a bearing device in which the sealing device is mounted.

[0011] The sealing device 10 seals the annular space S between an outer member and an inner member that rotate coaxially relative to each other. The sealing device 10 comprises a first member 11 attached to the outer member and a second member 20 attached to the inner member. The first member 11 comprises a first cylindrical portion 13 disposed on the inner circumference side of the outer member, a first ring portion 14 extending inward from the annular space side end of the first cylindrical portion 13, and a sealing portion 15 having a non-contact lip 16 fixed to the first ring portion 14 and disposed non-contact with the second member 20. The second member 20 comprises a second cylindrical portion 22 fitted to the outer circumference surface of the inner member, a second ring portion 23 connected to the second cylindrical portion 22, and a third cylindrical portion 24 connected to the second ring portion 23 and forming a labyrinth seal between itself and the first cylindrical portion 13. With this configuration, the labyrinth seal can suppress the intrusion of foreign matter such as muddy water. The third cylindrical portion 24 has a bent portion 25 that is bent inward toward the inner diameter at the end on the annular space S side (the other end on the axial side). The non-contact lip 16 and the bent portion 25 are provided so that a portion of them overlap each other when viewed in the axial direction. With this configuration, even if the first member 11 and the second member 20 are displaced in a direction away from each other in the axial direction, the bent portion 25 and the non-contact lip 16 can catch and engage, preventing separation. Furthermore, compared to a configuration in which a sealing lip that contacts other members to seal catches and engages, the non-contact lip 16 is not a member that contacts other members to seal, so even if scratches occur on the surface of the non-contact lip 16 due to engagement with the bent portion 25, the impact on sealing performance can be reduced. A detailed explanation follows below.

[0012] As shown in Figure 1, the bearing device 1 supports a wheel (not shown) of a vehicle such as an automobile so that it can rotate around an axis. The bearing device 1 is generally composed of an outer ring 2 corresponding to the outer member described above, an inner ring 5 corresponding to the inner member described above, and two rows of rolling elements (balls) 6 interposed between the outer ring 2 and the inner ring 5. The inner ring 5 is composed of a hub ring 3 and an inner ring member 4, and the inner ring member 4 is fitted integrally with the vehicle body side of the hub ring 3. A drive shaft 7 is coaxially spline-fitted to the hub ring 3, and the drive shaft 7 is connected to a drive source (drive transmission unit) not shown via a constant velocity joint 8. The drive shaft 7 is integrated with the hub ring 3 by a nut 7a, preventing the hub ring 3 from falling off the drive shaft 7. The inner ring 5 (hub ring 3 and inner ring member 4) is rotatable around an axis L relative to the outer ring 2, and the outer ring 2 and the inner ring 5 constitute two members that rotate relatively, forming an annular space S. Within the annular space S, two rows of rolling elements 6... are interposed to allow rolling of the raceway 2a of the outer ring 2, the hub ring 3, and the raceway 3a, 4a of the inner ring member 4, while being held by a retainer 6a. The hub ring 3 has a cylindrical hub ring body 3b and a hub flange 3d formed to extend outward from the hub ring body 3b via a rising base 3c, and the wheel is attached and fixed to the hub flange 3d by bolts 3e and nuts (not shown).

[0013] The sealing device 10 is mounted between the outer ring 2 and the inner ring member 4 to seal one axial end (vehicle body side) of the annular space S. In addition, another sealing device 9 is mounted between the outer ring 2 and the hub ring 3, sliding against the hub ring 3, to seal the other axial end (wheel side) of the annular space S. As a result, both axial ends of the annular space S are sealed, preventing the intrusion of foreign matter such as muddy water into the annular space S and preventing the leakage of lubricant (grease, etc.) filled in the annular space S to the outside. The sealing device 10 is mounted on the bearing device 1 such that one axial side surface is positioned substantially flush with one axial side surface of the outer ring 2 and the inner ring member 4.

[0014] As shown in Figure 2, the first member 11 is a cylindrical member with a substantially L-shaped cross-section. The first member 11 comprises a core metal 12 having a first cylindrical portion 13 and a first ring portion 14, and a seal portion 15 fixed to the core metal 12. The first cylindrical portion 13 is formed to fit over the entire circumference of the inner surface of the outer ring 2. On one axial side of the outer surface of the first cylindrical portion 13, a recess 13a is formed that is recessed toward the inner diameter. The first ring portion 14 is formed extending toward the inner diameter from the other axial side (wheel side, annular space S side) end of the first cylindrical portion 13 so as to form a gap between it and the second cylindrical portion 22 of the second member 20. The core metal 12 may be formed by press-forming a steel plate such as SPCC or SUS.

[0015] The seal portion 15 is fixed so as to cover the entire inner circumferential surface of the first cylindrical portion 13 and the entire axial surface of one side of the first ring portion 14. The seal portion 15 is also fixed so as to cover a recess 13a of the first cylindrical portion 13 and a portion of the inner diameter side of the other axial surface of the first ring portion 14. The seal portion 15 is provided with an annular projection 19 that protrudes outward from the portion covering the recess 13a. The seal portion 15 may be made of an elastic material such as rubber, for example, NBR, H-NBR, ACM, AEM, or FKM. The non-contact lip 16 is configured not to contact the second member 20 when the first member 11 and the second member 20 are assembled (when the axial surface of one side of the first member 11 and the axial surface of one side of the second member 20 are assembled to be substantially the same plane), and is provided on one axial side of the first ring portion 14. The non-contact lip 16 is shaped to be non-contact with the second member 20 when the first member 11 and the second member 20 are assembled, and extends toward the second member 20. The non-contact lip 16 is formed so that its outer peripheral surface 16d, excluding the tip portion 16a on one axial side, is substantially parallel to the axis L, and extends toward one axial side. Furthermore, the non-contact lip 16 is formed so that its inner peripheral surface inclins toward the outer diameter as it extends toward one axial side. The non-contact lip 16 is formed such that the base end on the other axial side has a greater radial thickness than the tip portion 16a. With this configuration, the tip portion 16a side is more elastically deformable than the base end. The tip portion 16a of the non-contact lip 16 extends toward the outer diameter. With this configuration, the tip portion 16a of the non-contact lip 16 extending toward the outer diameter acts as a weir, suppressing the intrusion of foreign matter such as muddy water. Furthermore, the tip portion 16a of the non-contact lip 16 is formed to overlap with the bent portion 25 when viewed in the axial direction, and is configured to be deformable when pressed by the bent portion 25 during assembly of the first member 11 and the second member 20. With this configuration, when assembling the first member 11 and the second member 20, the tip portion 16a of the non-contact lip 16 is pressed by the bent portion 25 and deforms, making assembly easier compared to a configuration in which the entire non-contact lip 16 deforms. In addition, since the deformation is smaller compared to a configuration in which the entire non-contact lip 16 deforms, damage to the non-contact lip 16 can be suppressed.In the illustrated example, the tip portion 16a of the non-contact lip 16 is formed as an inclined surface that slopes toward one side in the axial direction as the other side in the axial direction extends toward the outer diameter. The tip portion 16a of the non-contact lip 16 is formed in a shape that tapers toward the outer diameter. Furthermore, the radial dimension of the tip portion 16a of the non-contact lip 16 is formed to be larger than the axial dimension.

[0016] The sealing portion 15 is equipped with a sealing lip 17 on the inner diameter side of the non-contact lip 16, which elastically contacts the second member 20 and suppresses the intrusion of foreign matter such as muddy water. The sealing lip 17 is inclined toward the outer diameter side as it extends toward one axial direction. Furthermore, a grease lip 18 is provided on the inner diameter side of the sealing lip 17 to suppress the intrusion of lubricants such as grease in the annular space S into the sealing device 10. The grease lip 18 is inclined toward the other axial direction as it extends toward the inner diameter side. In the illustrated example, the grease lip 18 is in contact with the second cylindrical portion 22.

[0017] The second member 20 is formed in a double cylindrical shape, comprising a second cylindrical portion 22 and a third cylindrical portion 24. As shown in Figure 2, the second member 20 comprises a core metal 21 having the second cylindrical portion 22, a second ring portion 23, and a third cylindrical portion 24, and an elastic body 26 fixed to the core metal 21. The second cylindrical portion 22 is formed to fit over the entire circumference of the outer circumferential surface of the inner ring member 4. The second ring portion 23 is connected to the second cylindrical portion 22 and is formed to extend outward from one axial end of the second cylindrical portion 22. The third cylindrical portion 24 is connected to the second ring portion 23 and is formed to extend outward from the other axial end of the second ring portion 23. When the first member 11 and the second member 20 are assembled, the third cylindrical portion 24 is positioned radially between the non-contact lip 16 and the first cylindrical portion 13. In the illustrated example, the third cylindrical portion 24 is formed such that its axial dimension is smaller than that of the second cylindrical portion 22. The bent portion 25 is formed by bending the core metal 21. With this configuration, the bent portion 25 is less likely to deform when it catches and engages with the non-contact lip 16 compared to a configuration in which the bent portion 25 is formed of an elastic material. The bent portion 25 is formed by bending the other axial end of the third cylindrical portion 24 so that it inclins toward the inner diameter as it extends toward the other axial side. When the first member 11 and the second member 20 are assembled, the bent portion 25 is positioned toward the other axial side of the tip portion 16a of the non-contact lip 16 and is formed to be non-contact with the first member 11. Furthermore, when the first member 11 and the second member 20 are assembled, the bent portion 25 and the non-contact lip 16 are formed to overlap each other axially around their entire circumference.

[0018] The elastic body 26 is formed in an annular shape and is fixed so as to cover one axial side surface of the second ring portion 23 and the entire outer surface of the third cylindrical portion 24. The elastic body 26 is also fixed so as to cover a part of the outer surface of the bent portion 25. The elastic body 26 is made of magnetic rubber and has N poles and S poles magnetized alternately and continuously in the circumferential direction, and by facing a magnetic sensor (not shown) provided on the vehicle body or the like, it constitutes a magnetic encoder that detects the rotational speed of the inner ring 5.

[0019] In the sealed device 10, with the first member 11 and the second member 20 assembled, the tip 16a of the non-contact lip 16 overlaps with the bent portion 25 located on the other axial side, with a gap in between, when viewed in the axial direction. In this state, the first cylindrical portion 13 and the third cylindrical portion 24 face each other radially with a gap in between, forming a first labyrinth seal R1 corresponding to the labyrinth seal described above. In the illustrated example, the first labyrinth seal R1 is formed between a seal portion 15 covering the inner circumferential surface of the first cylindrical portion 13 and an elastic body 26 covering the outer circumferential surface of the third cylindrical portion 24. Furthermore, a second labyrinth seal R2 communicating with the first labyrinth seal R1 is formed between the bent portion 25 and the first ring portion 14. With this configuration, the entire labyrinth seal, which serves as a path for the intrusion of foreign matter such as muddy water, can be made longer, thereby improving resistance to muddy water. In the illustrated example, the second labyrinth seal R2 is formed in a bent shape between the axial other end face and inner circumferential surface of the tip 25a of the bent portion 25 and the outer circumferential surface 16d of the seal portion 15 covering the first ring portion 14 and the non-contact lip 16. Furthermore, a third labyrinth seal R3 communicating with the first labyrinth seal R1 is formed between the third cylindrical portion 24 and the non-contact lip 16. With this configuration, the overall length of the labyrinth seal is increased, and the intrusion of foreign matter such as muddy water can be suppressed more effectively. In the illustrated example, the third labyrinth seal R3 is formed in a bent shape between the outer circumferential surface 16b and one axial side surface 16c of the tip 16a of the non-contact lip 16 and the inner circumferential surface 24a of the third cylindrical portion 24 and the other axial side surface 23a of the second ring portion 23. Furthermore, the second labyrinth seal R2 is formed such that its axial dimension is smaller than the radial dimensions of the first labyrinth seal R1 and the third labyrinth seal R3. This configuration prevents mud and other fluids from passing through the first labyrinth seal R1, passing through the second labyrinth seal R2, and reaching the third labyrinth seal R3.

[0020] When storing or transporting multiple sealing devices 10, they may be stacked coaxially, as shown in Figure 3(a). In the illustrated example, the multiple sealing devices 10 are stacked with the elastic body 26 facing upwards, and the sealing portion 15 of the upper sealing device 10 is in contact with the elastic body 26 of the adjacent lower sealing device 10. This makes it difficult for the core metal 12 of the upper sealing device 10 to come into contact with the elastic body 26 of the adjacent lower sealing device 10, thereby suppressing the suction of the core metal 12 to the elastic body 26.

[0021] Even if the reaction force (tightening force) of the grease lip 18 is small enough not to hold the second member 20, as shown in Figure 3(b), if the tip 16a of the non-contact lip 16 catches and engages with the bent portion 25 when the first member 11 and the second member 20 are displaced in a direction away from each other, separation of the first member 11 and the second member 20 can be suppressed. This makes it possible to reduce the reaction force of the grease lip that holds the second member 20 by reaction force, thereby reducing torque. Furthermore, even if scratches occur on the surface of the non-contact lip 16, the sealing performance of the sealing device 10 can be maintained by the seal lip 17 and the grease lip 18. The non-contact lip 16 only needs to be formed in a suitable shape such that when the tip 16a catches and engages with the bent portion 25, the engagement between the bent portion 25 and the non-contact lip 16 is released and the first member 11 and the second member 20 do not separate (fall off). Furthermore, the tip portion 16a of the non-contact lip 16 should overlap the bent portion 25 in the axial direction by an appropriate radial dimension such that when the tip portion 16a catches and engages with the bent portion 25, the engagement between the bent portion 25 and the non-contact lip 16 is released and the first member 11 and the second member 20 do not separate (fall off). In the illustrated example, the non-contact lip 16 overlaps the bent portion 25 in the axial direction by approximately 1 / 5 to 1 / 3 of the radial dimension of the tip portion 16a.

[0022] Next, a modified sealing device will be described with reference to Figures 4 and 5. In each of the following modified examples, the differences from the previously described example will be mainly explained, and the configuration and effects of common parts will be omitted or briefly described.

[0023] Figure 4(a) shows a sealing device 10A according to the first modified example. In this modified example, the configuration of the second member 20A differs from the previous example. Unlike the previous example, the core metal 21A is configured without a bent portion. The second member 20A has a bent portion 25A formed of an elastic body 26A with lower rigidity than the core metal 21A on the other axial side of the third cylindrical portion 24A. With this configuration, compared to a configuration in which the bent portion is formed of a metal material, damage to the bent portion 25A and the non-contact lip 16 can be suppressed when it catches on and engages with the non-contact lip 16. The bent portion 25A covers the other axial end face 24b of the third cylindrical portion 24A and is bent so as it extends from the other axial end face 24b of the third cylindrical portion 24A toward the other axial side, it inclins toward the inner diameter side. The elastic body 26A may be formed of a thermoplastic elastic material. In such a case, the bent portion 25A may be formed by bending a heated elastic body 26A. For example, as shown in Figure 4(b), the elastic body 26A may be formed in a primary molding process so that an axial end 27 extending in the other axial direction from the third cylindrical portion 24A is formed. Then, the axial end 27 of the elastic body 26A may be heated and bent so that it inclins toward the inner diameter to form a bent portion 25A. Examples of thermoplastic elastic materials include rubber and thermoplastic elastomers.

[0024] Figure 5(a) shows a sealing device 10B according to a second modified example. In this modified example, the configuration of the non-contact lip 16A differs from that of the previous example. The outer circumferential surface 16d of the non-contact lip 16A is formed in a concave curved shape that curves inward from a virtual line parallel to the axis L. With this configuration, the path along the sealing portion 15 from the second labyrinth seal R2 to the tip 16a of the non-contact lip 16A becomes longer compared to a configuration in which the outer circumferential surface 16d is formed approximately parallel to the axial direction. Alternatively, the second labyrinth seal R2 may be formed only between the tip 25a of the bent portion 25A and the sealing portion 15 covering the first ring portion 14.

[0025] Figure 5(b) shows a sealing device 10C according to a third modified example. In this modified example, the configuration of the non-contact lip 16B and the grease lip 18A differs from the previous example. The non-contact lip 16B is formed such that its thickness dimension is substantially constant along the direction perpendicular to the overall extension direction, excluding the tip portion 16a. The non-contact lip 16B is formed to incline towards the outer diameter as it extends axially to one side. With this configuration, the non-contact lip 16B is pressed against the bent portion 25A when the first member 11 and the second member 20A are assembled, and the entire structure becomes elastically deformable. The grease lip 18A is formed to be non-contact with the second cylindrical portion 22. With this configuration, torque reduction can be achieved more effectively compared to a configuration in which the grease lip 18 is in contact.

[0026] The different configurations described in the above embodiments and their respective modifications may be modified, rearranged, or combined as appropriate and necessary. Furthermore, the sealing device is not limited to the above configuration. For example, in the sealing device 10 of Figures 2 and 3, the elastic body 26 may not cover the third cylindrical portion 24. More specifically, the elastic body 26 may be fixed to one axial side of the second ring portion 23 and not fixed to the outer circumferential surface of the third cylindrical portion 24. Also, the sealing device 10 may not have an elastic body 26. Furthermore, for example, the second labyrinth seal R2 may be formed only between the outer circumferential surface 16d of the non-contact lips 16, 16A, 16B and the inner circumferential surface of the tip portion 25a of the bent portions 25, 25A. Furthermore, the third labyrinth seal R3 may be formed only between the outer circumferential surface 16b of the tip portion 16a of the non-contact lips 16, 16A, 16B and the inner circumferential surface 24a of the third cylindrical portions 24, 24A, or it may be formed only between one axial side surface 16c of the tip portion 16a of the non-contact lips 16, 16A, 16B and the other axial side surface 23a of the second ring portion 23. The dimensional relationship of the first labyrinth seal R1, the second labyrinth seal R2, and the third labyrinth seal R3 is not limited to the dimensional relationship described in the above embodiment and may be changed as appropriate.

[0027] This international application claims priority based on Japanese Patent Application No. 2025-019707, filed on 10 February 2025, and the entire contents of said Japanese Patent Application No. 2025-019707 are incorporated herein by reference.

[0028] The above description of specific embodiments of the present invention is provided for illustrative purposes only. It is not intended to be exhaustive or to limit the invention to the forms described. Numerous modifications and changes are possible in light of the above description, as will be obvious to those skilled in the art.

[0029] 2 Outer ring (outer member) 4 Inner ring member (inner member) 5 Inner ring (inner member) 10, 10A to 10C Sealing device 11 First member 13 First cylindrical part 14 First ring part 15 Seal part 16, 16A, 16B Non-contact lip 16a Tip part 20, 20A Second member 21, 21A Core metal 22 Second cylindrical part 23 Second ring part 24, 24A Third cylindrical part 25, 25A Bent part 26, 26A Elastic body S Annular space

Claims

1. A sealing device for sealing an annular space between an outer member and an inner member that rotate relatively coaxially, comprising: a first member mounted on the outer member and a second member mounted on the inner member, wherein the first member comprises: a first cylindrical portion disposed on the inner circumference side of the outer member; a first ring portion extending inward from the annular space side end of the first cylindrical portion; and a sealing portion having a non-contact lip fixed to the first ring portion and disposed non-contact with the second member, wherein the second member comprises: a second cylindrical portion fitted to the outer circumference surface of the inner member; a second ring portion connected to the second cylindrical portion; and a third cylindrical portion connected to the second ring portion and forming a labyrinth seal between itself and the first cylindrical portion, wherein the third cylindrical portion has a bent portion bent inward at its annular space side end, and the non-contact lip and the bent portion are provided such that a portion of them overlap each other when viewed in the axial direction.

2. The sealing device according to claim 1, wherein the second member is provided with a core metal, and the bent portion is formed by bending the core metal.

3. The sealing device according to claim 1, wherein the second member comprises a thermoplastic elastic body, and the bent portion is formed by bending the heated elastic body.

4. The sealing device according to any one of claims 1 to 3, characterized in that a labyrinth seal is formed between the third cylindrical portion and the non-contact lip, communicating with the labyrinth seal formed between the first cylindrical portion and the third cylindrical portion.

5. The sealing device according to any one of claims 1 to 3, characterized in that a labyrinth seal is formed between the bent portion and the first ring portion, which communicates with the labyrinth seal formed between the first cylindrical portion and the third cylindrical portion.

6. The sealing device according to any one of claims 1 to 3, wherein the tip of the non-contact lip is bent toward the outer diameter and is formed to overlap with the bent portion when viewed in the axial direction, and is configured to be deformable when pressed by the bent portion during assembly of the first member and the second member.

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