Sealing device

Abstract

Provided is a sealing device that can maintain sealing performance even if there is positional deviation in a thrust direction.　A sealing device (1) is for achieving a seal between an outer circumference-side member and an inner circumference-side member which are capable of relative rotation, and comprises an outside seal member (2) that is attached to the outer circumference-side member, and an inside seal member (3) that is attached to the inner circumference-side member. The outside seal member (2) has an annular member (23) that has an inside tubular section (231) extending along the axial (x) direction, and a seal lip section (221) that is in sliding contact with the inside seal member (3) further to an interior space side than the annular member (23). The inside seal member (3) has an inside contact section (321) that has a plurality of protrusions (321A) and is in sliding contact with the inside tubular section (231). The length (L3) of the region in which the plurality of protrusions (321A) of the inside contact section (321) are formed is greater than the smallest interval (L2) between facing sections (10, 20) of the outside seal member (2) and the inside seal member (3).

Description

[Technical field]

[0001] The present invention relates to a sealing device. [Background technology]

[0002] Conventionally, sealing devices have been used to seal between a plurality of relatively rotatable members. Such sealing devices are sometimes used to suppress leakage of a lubricant as a sealed object provided in the internal space of an apparatus, and to suppress the intrusion of mud, dust, and the like from the atmosphere side. Therefore, a sealing device provided with a plurality of protrusions in addition to a dust lip portion to suppress the intrusion of dust, and the like has been proposed (for example, see Patent Document 1).

[0003] In the sealing device described in Patent Document 1, multiple protrusions are provided on the rotating seal member and are in sealing contact with the cylindrical portion of the stationary seal member on the atmospheric side of the dust lip, thereby reducing the intrusion of foreign matter from the atmospheric side into the internal space. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2018 / 117100 Summary of the Invention [Problem to be solved by the invention]

[0005] Depending on the equipment in which the sealing device is provided, there may be cases where misalignment in the thrust direction (axial direction) is likely to occur between an outer peripheral member and an inner peripheral member that are rotatable relative to one another. In such equipment, if the sealing device described in Patent Document 1 is used, the intrusion of foreign matter is suppressed by the multiple protrusions, but it is difficult to maintain sealing performance when misalignment in the thrust direction occurs.

[0006] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a sealing device that can maintain sealing performance even if a positional deviation occurs in the thrust direction. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the sealing device of the present invention is a sealing device for achieving sealing between an outer peripheral side member and an inner peripheral side member which are rotatable relative to one another, and comprises an outer seal member attached to the outer peripheral side member, and an inner seal member attached to the inner peripheral side member, wherein the outer seal member has an annular member having an axial extending portion extending along the axial direction, and a seal lip portion which is in sliding contact with the inner seal member on the internal space side of the annular member, and the inner seal member has a contact portion which has a plurality of protrusions and is in sliding contact with the axial extending portion, and the outer seal member and the inner seal member have at least one opposing portion which oppose each other with an axial gap therebetween, on the atmospheric side of the seal lip portion and on the outer peripheral side of the axial extending portion, and the axial length of the contact portion in which the plurality of protrusions are formed is greater than the minimum spacing of the at least one opposing portion.

[0008] In a sealing device according to one embodiment of the present invention, the outer seal member integrally has an inner cylindrical portion as the axially extending portion, an outer cylindrical portion arranged outer circumferentially of the inner cylindrical portion, and a connecting portion connecting the inner cylindrical portion and the outer cylindrical portion, and the inner seal member integrally has an inner contact portion as the contact portion that slides against the inner cylindrical portion, an outer contact portion that slides against the outer cylindrical portion, and a contact connecting portion that connects the inner contact portion and the outer contact portion, and the connecting portion and the inner contact portion or the outer contact portion form the opposing portion, and the contact connecting portion and the inner cylindrical portion or the outer cylindrical portion form the opposing portion.

[0009] In the sealing device according to one aspect of the present invention, the contact connection portion is formed in an annular shape, and the inner contact portion and the outer contact portion extend from the contact connection portion toward the atmosphere side.

[0010] In a sealing device according to one aspect of the present invention, the inner contact portion is in sliding contact with the inner cylindrical portion from an inner circumferential side, and the outer contact portion is in sliding contact with the outer cylindrical portion from an inner circumferential side.

[0011] In a sealing device according to one embodiment of the present invention, the inner seal member has an annular flange portion closer to the internal space than the annular member and closer to the atmosphere than the seal lip portion, and the outer seal member has an annular contact portion having multiple protrusions and which is in sliding contact with the flange portion.

[0012] In a sealing device according to one aspect of the present invention, the outer seal member has a recess that is recessed in the axial direction on a path from an atmospheric space toward the annular contact portion. Effect of the Invention

[0013] According to the sealing device of the present invention, it is possible to maintain the sealing performance even if a positional deviation occurs in the thrust direction. [Brief description of the drawings]

[0014] [Figure 1] 1 is a side view that illustrates a schematic diagram of an agricultural machine as an example of equipment in which a sealing device according to an embodiment of the present invention is used. [Diagram 2] 1 is a cross-sectional view of a sealing device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view that shows an agricultural machine 100 as an example of an apparatus in which a sealing device 1 according to an embodiment of the present invention is used, and FIG. 2 is a cross-sectional view of the sealing device 1 according to an embodiment of the present invention. The sealing device 1 is used in, for example, a bogie of a railway vehicle, a bogie of a sintered pallet, a construction machine, a trunnion-type suspension of a truck, and the like, other than an agricultural machine, and is intended to suppress leakage of lubricating oil as a sealed object in the apparatus to the outside of the apparatus (atmosphere), and to suppress intrusion of foreign matter such as liquid, dust, mud, etc. into the apparatus from the outside. The agricultural machine 100 as an example of an apparatus in which the sealing device 1 is used has a wheel 101 and a drive unit for rotating and driving the wheel 101. For example, the sealing device 1 may be provided on the axle of the wheel 101, the output shaft of the drive unit, etc. Since such an agricultural machine 100 is used in a situation in which a lot of foreign matter such as mud is present, the sealing device 1 is required to have foreign matter resistance. Furthermore, the agricultural machine 100 is prone to vibrations and the like, which makes it easy for positional deviations (particularly positional deviations in the thrust direction) to occur at the locations where the sealing devices 1 are provided.

[0016] A sealing device 1 according to an embodiment of the present invention is a sealing device for achieving sealing between an outer peripheral side member and an inner peripheral side member which are rotatable relative to each other, and includes an outer seal member 2 attached to the outer peripheral side member, and an inner seal member 3 attached to the inner peripheral side member. The outer seal member 2 includes an annular member 23 having an inner cylindrical portion 231 as an axially extending portion extending along the axis x direction, and a seal lip portion 221 which is in sliding contact with the inner seal member 3 on the inner space side of the annular member 23. The inner seal member 3 includes an inner contact portion 321 having a plurality of projections 321A and in sliding contact with the inner cylindrical portion 231. The outer seal member 2 and the inner seal member 3 have at least one opposing portion 10, 20 that faces each other with a gap in the direction of the axis x, on the atmospheric side of the seal lip portion 221 and on the outer circumferential side of the inner cylindrical portion 231, and the length L3 in the direction of the axis x of the region of the inner contact portion 321 in which the multiple protrusions 321A are formed is greater than the minimum gap L2 between the at least one opposing portion 10, 20.

[0017] For ease of explanation, in the following description, the direction of the arrow a (see FIG. 2) in the axial direction of the sealing device 1 (one side in the axial direction) is defined as the internal space side, and the direction of the arrow b (see FIG. 2) in the axial direction of the sealing device 1 (the other side in the axial direction) is defined as the atmosphere side. Also, in a direction perpendicular to the axis x (hereinafter also referred to as the "radial direction"), the direction away from the axis x (the direction of the arrow c in FIG. 2) is defined as the outer periphery side, and the direction approaching the axis x (the direction of the arrow d in FIG. 2) is defined as the inner periphery side. In the following description, when describing the positional relationship and direction of each member, the positional relationship and direction in the drawings are shown, and are not shown as the positional relationship and direction when actually assembled in a vehicle or the like.

[0018] The outer peripheral member is, for example, a housing with a through hole formed therein, and the outer seal member 2 is attached to the inner peripheral surface of the through hole and functions as a fixed seal member. The inner peripheral member is, for example, a rotating shaft inserted into the through hole, and the inner seal member 3 is attached to the outer peripheral surface of the rotating shaft and functions as a rotary seal member. The outer seal member 2 and the inner seal member 3 are fitted together, and most of the annular inner seal member 3 is surrounded by the annular outer seal member 2.

[0019] The outer seal member 2 has a reinforcing ring 21, an elastic body portion 22 formed integrally with the reinforcing ring 21 by an elastic body, and an annular member 23. The elastic body of the elastic body portion 22 is, for example, a rubber material such as fluororubber or acrylic rubber. The reinforcing ring 21 is, for example, made of metal and manufactured by pressing or forging, and the elastic body portion 22 is molded by crosslinking (vulcanization) molding using a molding die.

[0020] The reinforcing ring 21 has a cylindrical portion 211 and an annular flange portion 212 extending from the end of the cylindrical portion 211 on the internal space side to the inner periphery side. The end of the cylindrical portion 211 on the atmosphere side is bent toward the inner periphery side. The cylindrical portion 211 is formed in a cylindrical or approximately cylindrical shape around the axis x. The flange portion 212 is formed in an annular or approximately annular shape around the axis x direction as a whole and is embedded in the elastic body portion 22. The flange portion 212 is bent from the end of the cylindrical portion 211 on the internal space side to the inner periphery side, in that order, extending toward the inner periphery side, extending toward the internal space side, extending toward the atmosphere side, and extending toward the inner periphery side.

[0021] The elastic body portion 22 is provided so as to mainly cover the flange portion 212, and is formed in an annular or substantially annular shape around the axis x as a whole, and has a seal lip portion 221, a dust lip portion 222, and an annular contact portion 223. Note that a configuration in which two or more dust lip portions are provided may be used. The seal lip portion 221 extends from the vicinity of the edge of the inner circumference side of the flange portion 212 toward the inner space as it moves toward the inner circumference side. A garter spring 4 is provided on the outer circumference side of the seal lip portion 221. The dust lip portion 222 extends from the vicinity of the edge of the inner circumference side of the flange portion 212 toward the atmosphere as it moves toward the inner circumference side.

[0022] The annular contact portion 223 is provided on the atmosphere side of the flange portion 212, and has a plurality of protrusions 223A on a surface facing the atmosphere side. The plurality of protrusions 223A of the annular contact portion 223 are formed in a circular or approximately circular shape around the axis x direction, and are arranged concentrically. In addition, a recess 224 is formed on the outer circumferential side of the annular contact portion 223 in the elastic body portion 22. The recess 224 corresponds to a portion of the flange portion 212 that extends from the internal space side toward the atmosphere side, and has a shape that opens toward the atmosphere side.

[0023] The annular member 23 is made of, for example, metal and manufactured by pressing or forging. The annular member 23 integrally includes an inner cylindrical portion 231 as an axial extension portion extending along the axis x direction, an outer cylindrical portion 232 disposed on the outer circumferential side of the inner cylindrical portion 231, and a connecting portion 233 connecting the inner cylindrical portion 231 and the outer cylindrical portion 232. The inner cylindrical portion 231 and the outer cylindrical portion 232 are formed in a cylindrical or approximately cylindrical shape around the axis x, and the inner cylindrical portion 231 has a larger dimension in the axis x direction than the outer cylindrical portion 232. The connecting portion 233 connects the air side ends of the inner cylindrical portion 231 and the outer cylindrical portion 232 to each other, and is formed in a circular or approximately circular shape around the axis x. As a result, the annular member 23 has a U-shaped cross-sectional shape.

[0024] The annular member 23 is disposed so that the outer tubular portion 232 contacts the inner circumferential surface of the tubular portion 211 of the reinforcing ring 21, and is fixed to the reinforcing ring 21 by, for example, fitting.

[0025] The inner seal member 3 has a reinforcing ring 31 and an elastic body portion 32 formed integrally with the reinforcing ring 31 by an elastic body. The elastic body of the elastic body portion 32 is, for example, a rubber material such as fluororubber or acrylic rubber. The reinforcing ring 31 is, for example, made of metal and manufactured by pressing or forging, and the elastic body portion 32 is molded by crosslinking (vulcanization) molding using a molding die.

[0026] The reinforcing ring 31 integrally includes a tubular portion 311 having a cylindrical or approximately cylindrical shape about the axis x, and a flange portion 312 formed in an annular or approximately annular shape about the axis x. The flange portion 312 extends from the end of the tubular portion 311 on the atmosphere side toward the outer periphery, and the reinforcing ring 31 has an L-shaped cross section.

[0027] The elastic body portion 32 is provided so as to mainly cover the inner peripheral side and the atmospheric side of the reinforcing ring 31, and integrally includes an inner contact portion 321 as a contact portion that contacts the inner cylindrical portion 231, which is an axial extension portion, an outer contact portion 322, and a contact connection portion 323. The contact connection portion 323 is formed in an annular or substantially annular shape around the axis x. The inner contact portion 321 extends from the inner peripheral end portion of the contact connection portion 323 toward the atmospheric side, and is formed in a cylindrical or substantially cylindrical shape around the axis x. The outer contact portion 322 extends from the outer peripheral end portion of the contact connection portion 323 toward the atmospheric side, and is formed in a cylindrical or substantially cylindrical shape around the axis x. As a result, the elastic body portion 32 has a U-shaped cross section formed integrally by the inner contact portion 321, the outer contact portion 322, and the contact connection portion 323. The end of the inner contact portion 321 on the atmosphere side is located closer to the atmosphere than the end of the outer contact portion 322 on the atmosphere side.

[0028] The inner contact portion 321 and the outer contact portion 322 each have a plurality of protrusions 321A, 322A on their outer circumferential surfaces. The plurality of protrusions are formed in a circle around the axis x and are aligned along the direction of the axis x.

[0029] Here, a description will be given of the positional relationship between each part of the outer seal member 2 and each part of the inner seal member 3 in the sealing device 1. The seal lip portion 221 and the dust lip portion 222 of the outer seal member 2 are in sliding contact with the outer peripheral surface 311A ​​of the tubular portion 311 of the reinforcing ring 31 of the inner seal member 3. At this time, the seal lip portion 221 is in sliding contact with the outer peripheral surface 311A ​​on the inner space side of the annular member 23.

[0030] The annular contact portion 223 of the outer seal member 2 is in sliding contact from the inner space side with the inner space side surface 312A of the flange portion 312 of the reinforcing ring 31 of the inner seal member 3. At this time, the annular contact portion 223 is disposed closer to the atmosphere than the seal lip portion 221, and the flange portion 312 is disposed closer to the inner space than the annular member 23 and is disposed closer to the atmosphere than the seal lip portion 221.

[0031] The inner contact portion 321 of the inner seal member 3 is in sliding contact with the inner circumferential surface 231A of the inner cylindrical portion 231 of the annular member 23 of the outer seal member 2. That is, the inner contact portion 321 is in sliding contact with the inner cylindrical portion 231 from the inner circumferential side. The outer contact portion 322 of the inner seal member 3 is in sliding contact with the inner circumferential surface 232A of the outer cylindrical portion 232 of the annular member 23 of the outer seal member 2. That is, the outer contact portion 322 is in sliding contact with the outer cylindrical portion 232 from the inner circumferential side.

[0032] The sealing device 1 has the above-mentioned structure, and thus forms a sealing structure as described below. First, the inner contact portion 321 and the outer contact portion 322 slide against the inner cylindrical portion 231 and the outer cylindrical portion 232, respectively, to form a space A surrounded by the annular member 23 having a U-shaped cross section that opens to the internal space side and the portion of the elastic body portion 32 that has a U-shaped cross section that opens to the atmosphere side.

[0033] Space A has a labyrinth structure. In order for a foreign object to pass through space A from the atmosphere side toward the internal space side, the foreign object must pass between the inner contact portion 321 and the inner cylindrical portion 231 from the atmosphere side toward the internal space side, then pass from the internal space side toward the atmosphere side within space A, and then pass between the outer contact portion 322 and the outer cylindrical portion 232 from the atmosphere side toward the internal space side. That is, the foreign object must move back and forth in the direction of axis x, and cannot pass through space A by moving only in one direction.

[0034] Furthermore, even if the foreign matter passes through space A, it must pass between the annular contact portion 223 and the flange portion 312 to reach the dust lip portion 222. At this time, the direction of movement of the foreign matter is toward the inner periphery, which intersects with the direction of passage through space A. Furthermore, the recess 224 is formed in the path from space A to the annular contact portion 223, which makes it easier for the foreign matter to be trapped.

[0035] On the atmospheric side of the seal lip portion 221 and on the outer peripheral side of the inner cylindrical portion 231, the connection portion 233 and the outer contact portion 322 face each other with a gap L1 in the axial x direction, and these become the facing portion 10. Also, on the atmospheric side of the seal lip portion 221, the inner cylindrical portion 231 and the contact connection portion 323 face each other with a gap L2 in the axial x direction, and these become the facing portion 20. That is, the outer seal member 2 and the inner seal member 3 have two facing portions 10, 20. In this embodiment, the gap L2 of the facing portion 20 is smaller than the gap L1 of the facing portion 10. Also, the lengths L3, L4 of the regions in which the multiple protrusions 321A, 322A are formed in the inner contact portion 321 and the outer contact portion 322 in the axial x direction are both larger than the gap L2.

[0036] The maximum amount of misalignment when misalignment occurs between the outer seal member 2 and the inner seal member 3 in the thrust direction (axis x direction) is equal to the smaller of the intervals L1, L2 (i.e., interval L2) between the opposing portions 10, 20. At this time, the lengths L3, L4 of the regions in which the multiple protrusions 321A, 322A are formed in the axis x direction are greater than the interval L2, so that even if misalignment occurs in the thrust direction, contact between the protrusions 321A, 322A and the cylindrical portions 231, 232 is maintained.

[0037] Thus, according to the sealing device 1 of the embodiment of the present invention, the length L3 in the axial x direction of the region of the inner contact portion 321 in which the multiple protrusions 321A are formed is greater than the minimum distance L2 between the opposing portions 10, 20 that face each other in the axial x direction. Therefore, even if a positional deviation in the thrust direction occurs, contact between the protrusions 321A and the tubular portion 231 is maintained, and sealing performance can be maintained even if a positional deviation in the thrust direction occurs.

[0038] In addition, the annular member 23 of the outer seal member 2 has an inner cylindrical portion 231, an outer cylindrical portion 232, and a connecting portion 233 integrally therewith, and the elastic portion 32 of the inner seal member 3 has an inner contact portion 321, an outer contact portion 322, and a contact connecting portion 323 integrally therewith, with the inner contact portion 321 slidingly contacting the inner cylindrical portion 231 and the outer contact portion 322 slidingly contacting the outer cylindrical portion 232, thereby forming a labyrinth-structured space A and improving the performance of preventing the intrusion of foreign matter.

[0039] Furthermore, the contact connection part 323 is formed in an annular shape, and the inner contact part 321 and the outer contact part 322 extend from the contact connection part 323 toward the atmosphere side, thereby forming a part having a U-shaped cross section. This makes it easier to form the space A by combining with the annular member 23 having a U-shaped cross section.

[0040] In addition, the inner contact portion 321 slides against the inner cylindrical portion 231 from the inner circumferential side, and the outer contact portion 322 slides against the outer cylindrical portion 232 from the inner circumferential side, which makes it easier to slide against the target compared to a configuration in which each contact portion slides against the outer circumferential side. In addition, by having the two contact portions slide against each other from the same side, the direction of the force pressing against the target is the same, which makes it easier to assemble the outer seal member 2 and the inner seal member 3.

[0041] In addition, by providing the annular contact portion 223 in addition to the inner contact portion 321 and the outer contact portion 322, it is possible to more easily prevent the foreign matter from heading toward the dust lip portion 222 even if the foreign matter passes through space A.

[0042] The present invention is not limited to the above embodiment, but includes other configurations that can achieve the object of the present invention, and the following modifications are also included in the present invention. For example, in the above embodiment, the contact connection part 323 is formed in an annular shape, but the shape of the contact connection part is not limited to this, and may be cylindrical or other shapes. In addition, the inner contact part and the outer contact part may extend from the contact connection part toward the internal space side, and in this case, it is only necessary that the inner cylindrical part and the outer cylindrical part of the annular member extend from the connection part toward the atmosphere side.

[0043] In the above embodiment, the inner contact portion 321 is in sliding contact with the inner cylindrical portion 231 from the inner circumferential side, and the outer contact portion 322 is in sliding contact with the outer cylindrical portion 232 from the inner circumferential side, but each contact portion may be in contact with each cylindrical portion from either the inner circumferential side or the outer circumferential side. Also, the side with which the inner contact portion comes in contact and the side with which the outer contact portion comes in contact may be different from each other.

[0044] In the above embodiment, the annular contact portion 223 is provided in addition to the inner contact portion 321 and the outer contact portion 322, but the annular contact portion may be omitted. Also, a contact portion for preventing the passage of foreign matter may be provided on the atmosphere side of the space A.

[0045] In addition, in the above embodiment, the outer seal member 2 has a recess 224 that is concave in the direction of the axis x on the path from the atmospheric space A toward the annular contact portion 223, but a recess may be formed in another portion, and such a recess may be omitted depending on the expected amount of intrusion of foreign matter.

[0046] In the above embodiment, the length L3 of the contact portion 321 is greater than the interval L2, but when a plurality of contact portions are provided, it is sufficient that the axial length of the region in which the plurality of protrusions are formed in at least one contact portion arranged on the inner periphery side of the opposing portions is greater than the minimum interval between the opposing portions. Also, it is sufficient that the number of contact portions arranged on the inner periphery side of the opposing portions and the number of cylindrical portions are at least one.

[0047] In addition, in the above embodiment, each part of the sealing device 1 is formed in an annular, approximately annular, cylindrical or approximately cylindrical shape, but these may be annular, and the specific shape may correspond to the outer circumferential member and the inner circumferential member.

[0048] Although the embodiment of the present invention has been described above, the present invention is not limited to the sealing device according to the embodiment of the present invention, and includes all aspects included in the concept and scope of the claims of the present invention. In addition, each configuration may be appropriately and selectively combined so as to achieve at least a part of the above-mentioned problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiment may be appropriately changed depending on the specific use mode of the present invention. [Explanation of symbols]

[0049] 1...sealing device, 2...outer seal member, 21...reinforcing ring, 211...cylindrical portion, 212...flange portion, 22...elastomeric portion, 221...seal lip portion, 222...dust lip portion, 223...annular contact portion, 223A...projection, 224...recess, 23...annular member, 231...inner cylindrical portion (axial extension portion), 231A...inner peripheral surface, 232...outer cylindrical portion, 232A...inner peripheral surface, 233...connection portion, 3...inner seal member, 31...reinforcing ring, 311...cylindrical portion, 311A...outer peripheral surface, 312...flange portion, 312A...inner space side surface, 32...elastomeric portion, 321...inner contact portion (contact portion), 321A...projection, 322...outer contact portion, 322A...projection, 323...contact connection portion, 4...garter spring, A...space, 10, 20...opposing portion

Claims

1. A sealing device for sealing between an outer circumferential member and an inner circumferential member which are rotatable relative to each other, an outer seal member attached to the outer circumferential member; an inner seal member attached to the inner circumferential member, the outer seal member has an annular member having an axially extending portion extending along an axial direction, and a seal lip portion in sliding contact with the inner seal member on an internal space side of the annular member, the inner seal member has a contact portion having a plurality of protrusions and in sliding contact with the axially extending portion, the outer seal member and the inner seal member have at least one opposing portion that is opposed to each other with a gap therebetween in the axial direction, the opposing portion being located on the atmosphere side of the seal lip portion and on the outer peripheral side of the axial extending portion or at the same radial position as the axial extending portion, a length in the axial direction of the region of the contact portion where the plurality of projections are formed is greater than a minimum interval between the at least one opposing portion, the outer seal member integrally includes an inner cylindrical portion as the axially extending portion, an outer cylindrical portion disposed on an outer circumferential side of the inner cylindrical portion, and a connecting portion connecting the inner cylindrical portion and the outer cylindrical portion, A sealing device, wherein the inner tubular portion and the connecting portion are spaced apart in the axial direction from the inner seal member.

2. The inner seal member integrally includes an inner contact portion as the contact portion that slides against the inner tubular portion, an outer contact portion that slides against the outer tubular portion, and a contact connecting portion that connects the inner contact portion and the outer contact portion; The sealing device according to claim 1 , wherein the connection portion and the inner contact portion or the outer contact portion form the opposing portion, and the contact connection portion and the inner cylindrical portion or the outer cylindrical portion form the opposing portion.

3. The contact connection portion is formed in an annular shape, The sealing device according to claim 2 , wherein the inner contact portion and the outer contact portion extend from the contact connection portion toward an atmosphere side.

4. the inner contact portion is in sliding contact with the inner cylindrical portion from an inner circumferential side, The sealing device according to claim 3 , wherein the outer contact portion is in sliding contact with the outer cylindrical portion from an inner circumferential side.

5. the inner seal member has an annular flange portion on the internal space side of the annular member and on the atmosphere side of the seal lip portion, The sealing device according to any one of claims 2 to 4, wherein the outer seal member has an annular contact portion having a plurality of projections and in sliding contact with the flange portion.

6. The sealing device according to claim 5 , wherein the outer seal member has a recess that is recessed in an axial direction on a path from an atmospheric side space toward the annular contact portion.

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