JP2018132078A - Gasket and seal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasket capable of keeping excellent sealability though assembling load is low, and a seal structure superior in assembling stability of the gasket.SOLUTION: A gasket 1 made of an elastic material and mounted on an annular inner/outer fitting parts 4 of two members 2, 3 to be sealed, and a seal structure using the gasket 1 are provided. The gasket 1 includes an annular gasket main body portion 10 externally fitted to a step face 21 formed on an outer peripheral face 20 of a first member 2 positioned inside of the fitting parts 4 of the two members 2, 3 in a state of being recessed to an inner side, at one end portion 10a side, an annular lip portion 11 extended from an inner peripheral portion 10b of the gasket main body portion 10 while inclined to an inner side and the other end portion 10c side and kept into contact with the step face 21 of the first member 2, and an annular projecting portion 12 formed on an outer peripheral portion 10d of the gasket main body portion 10 while kept into contact with an inner peripheral face 30 of the second member 3 positioned outside of the fitting parts 4 of the two members 2, 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to, for example, a gasket made of an elastic material attached to an annular inner and outer fitting portion in a joint portion between pipes and a sealing structure using the gasket.

  Patent Literature 1 and Patent Literature 2 describe examples of the gasket and the sealing structure as described above. Patent Document 1 discloses a sealing structure in which a packing (gasket) having a cylindrical portion and a taper portion is interposed between annular inner and outer fitting portions of two pipe members to seal the fitting portions of both pipe members. It is disclosed. Patent Document 2 also discloses a sealing structure having a basic configuration common to that of Patent Document 1.

Utility Model Registration No. 2504083 JP 2001-27374 A

  By the way, in the case of the gasket and the sealing structure described in Patent Document 1 and Patent Document 2, in both cases, the cylindrical portion is connected to the one pipe member with respect to the one pipe member positioned outside in the fitting portion. It is mounted so as to be in close contact with the inner peripheral surface of the member. In addition, the other pipe member positioned on the inner side in the fitting portion is inserted into the inner diameter portion of the taper portion in the gasket mounted on the one pipe member. At this time, since the outer diameter of the other pipe member is larger than the minimum inner diameter of the taper portion of the gasket, the other pipe member is inserted into the inner peripheral portion of the gasket so as to push the taper portion. Since the cylindrical portion of the gasket is in close contact with the inner peripheral surface of one pipe member, when the other pipe member is inserted, the insertion force and the spreading force act on the taper portion, and the internal stress due to this acts as a taper. Concentrate on the base (base) of the part. For this reason, there is a concern that cracks or the like may occur at the base of the tapered portion. In order to prevent such cracks from occurring, it is effective to reduce the tightening margin between the tapered portion and the other pipe member (to reduce the assembly load), but one pipe member and the other pipe member It is expected that the uniform sealing performance in the circumferential direction by the tapered portion cannot be obtained depending on the runout and the processing tolerance.

  The present invention has been made in view of the above circumstances, and provides a gasket capable of maintaining a good sealing property even when the assembly load is low, and a sealing structure excellent in the assembly stability of the gasket. It is aimed.

  A gasket according to a first aspect of the present invention is a gasket made of an elastic material that is attached to an annular inner and outer fitting portion of two members to be sealed, and is a first one located on the inside of the fitting portion of the two members. An annular gasket main body part having one end side fitted on a stepped surface formed to be recessed inward on the outer peripheral surface of the member, and inclined from the inner peripheral part of the gasket main body part to the inner side and the other end side An annular lip portion that extends so as to contact the stepped surface of the first member, and the gasket main body portion that contacts the inner peripheral surface of the second member located outside the fitting portion of the two members And an annular protrusion formed on the outer peripheral portion of the head.

  According to the gasket of the present invention, one end of the gasket main body is fitted on the stepped surface of the outer peripheral surface of the first member to be sealed, the annular lip is in contact with the same stepped surface of the first member, The protrusion is configured to contact the inner peripheral surface of the second member to be sealed. That is, in the fitting portion of the first member and the second member through the gasket, the contact portion of the annular lip portion with the step surface of the first member and the contact portion of the annular protrusion with the inner peripheral surface of the second member. Sealing is performed at two locations of the part. Therefore, the assembly load of the gasket can be kept low, and stable sealing performance is maintained. Moreover, since the outer peripheral portion of the gasket main body does not adhere to the inner peripheral surface of the second member over the entire width in the fitting direction, the internal stress applied to the annular lip during assembly is reduced by deformation of the gasket main body. Is done. As a result, there is less concern about cracks due to stress concentration at the base of the annular lip. Further, by fitting one end of the gasket main body part to the stepped surface, the gasket main body part is integrated with the first member, and the mounting state with respect to the first member is stabilized.

  A sealing structure according to a second invention is a sealing structure in which the gasket is attached to an annular inner and outer fitting portion of two members to be sealed to seal the fitting portion, and the fitting portion of the first member The outer peripheral surface of the gasket is a stepped surface formed to be recessed inward, and the gasket has one end side of the gasket body portion externally fitted to the stepped surface with respect to the first member, and the annular shape. A lip portion is mounted so as to contact the stepped surface, and a tip end portion of the fitting portion in the fitting direction of the second member with respect to the first member is opened, and the fitting of the first member and the second member is performed. In the state, the annular protrusion of the gasket contacts the inner peripheral surface of the second member, and the front end surface of the first member in the fitting direction with respect to the second member is the fitting of the second member Part Kicking and wherein the abutting the base end surface perpendicular to and the fitting direction at the base end side of the fitting direction.

  According to this, since the one end portion side of the gasket main body portion is externally fitted to the step surface of the first member, the assembly property of the gasket is stable, and the annular lip portion contacts the step surface. The sealability of the part is established. Furthermore, the outer peripheral portion of the gasket main body opposite to the annular lip portion is provided with an annular protrusion that contacts the inner peripheral surface of the second member. And the surface pressure through the gasket between 2nd members becomes high, and the sealing performance by the said gasket is hold | maintained favorably. In addition, concentration of stress on the base portion of the annular lip portion hardly occurs. Moreover, in the fitting state of the first member and the second member, the front end surface of the first member in the fitting direction is the base end side in the fitting direction in the fitting portion of the second member and the fitting is performed. Since it contacts the orthogonal base end surface, the mutual fitting of the first member and the second member is accurately positioned at a predetermined position. Further, when a medium or the like to be sealed flows through the two members, it is difficult for the internal pressure of the medium to be applied to the annular lip portion, and the occurrence of inversion of the annular lip portion can be suppressed.

  In the sealing structure of the present invention, the step surface is a first step surface formed to be recessed inward on the outer peripheral surface of the first member, and the front side in the fitting direction with respect to the second member from the first step surface. The gasket has a two-step shape surface formed by a second step surface connected so as to be recessed inwardly, and the gasket has one end side of the gasket main body portion of the gasket in the first portion with respect to the first member. It is good also as what is mounted | worn so that the said annular lip part may contact | abut to a said 2nd level | step difference surface, and it is fitted to a level | step difference surface.

  According to this, since the one end part side of a gasket main-body part is externally fitted by the 1st level | step difference surface of the 2 step | paragraph outer peripheral surface in a 1st member, the assembly | attachment property of the said gasket is stabilized. Further, since the annular lip portion abuts on the second step surface, when a medium or the like to be sealed flows through the two members, the first step surface and the second step even when the internal pressure of the medium is applied to the annular lip portion. It is blocked by the step portion between the step surfaces, and the inversion of the annular lip portion is less likely to occur.

In the sealing structure of the present invention, the first step surface and the second step surface of the first member may be connected via an inclined surface.
According to this, the gasket is smoothly attached to the first member by fitting one end of the gasket body along the inclined surface when the one end of the gasket body is externally fitted to the first step surface. can do.

In the sealing structure of the present invention, the inner peripheral surface of the second member may be connected to a stepped surface that is recessed outward on the distal end side of the second member.
According to this, when the first member and the second member are fitted through the gasket, the annular protrusion easily comes into contact with the inner peripheral surface of the second member with little resistance.
In this case, the step surface of the second member may be connected to the inner peripheral surface via an inclined surface.
According to this, when the first member and the second member are fitted through the gasket, the contact of the annular protrusion with the inner peripheral surface of the second member is smoothly performed with less resistance.
Moreover, the 2nd inclined surface which is gradually dented toward the outer side further may be connected with the said front-end | tip part side of the said level | step difference surface in the said 2nd member.
According to this, when fitting the first member and the second member, the second inclined surface functions as a guide surface, and the fitting is smoothly performed.

The sealing structure of this invention WHEREIN: The front-end | tip part of the fitting direction with respect to the said 2nd member member in the said 1st member is good also as what is opened.
According to this, since the front-end | tip part of the fitting direction with respect to the 1st member of the 2nd member in the fitting part is also opening, in the fitting state via the gasket of the 1st member and the 2nd member, the 1st member And the inside of the second member communicates with each other. Therefore, when a specific medium circulates in the first member and the second member, the fitting portion is sealed by the gasket, so that the medium does not leak to the outside from the fitting portion. Further, another external medium does not enter the first member and the second member through the fitting portion from the outside.

  ADVANTAGE OF THE INVENTION According to this invention, the sealing structure excellent in the assembly | attachment stability of the gasket which can low assembly | attachment load and can hold | maintain favorable sealing performance is obtained.

1 is a partially broken longitudinal sectional view showing a first embodiment of a gasket and a sealing structure using the gasket according to the present invention. It is an enlarged view of the X section of FIG. It is a partially broken longitudinal cross-sectional view which shows 2nd Embodiment of the gasket which concerns on this invention, and the sealing structure using the same. FIG. 4 is an enlarged view of a Y part in FIG. 3. It is the same figure as FIG. 4 which shows the modification of the embodiment. It is a figure similar to FIG. 4 which shows another modification of the embodiment. It is a figure similar to FIG. 3 which shows another modification of the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are examples in which the present invention is applied to a connecting portion between synthetic resin pipes, and an elastic gasket mounted on an annular inner and outer fitting portion in the connecting portion, and the gasket. 1 shows a first embodiment of the sealing structure used. The gasket 1 in this embodiment is made of an elastic material that is attached to an annular inner / outer fitting portion 4 in a first pipe (first member) 2 and a second pipe (second member) 3 as two members to be sealed. It is a gasket. The first pipe 2 and the second pipe 3 in the present embodiment are both hollow cylindrical and are concentrically joined along the axis L via the fitting portion 4.

  The gasket 1 includes a gasket main body portion 10, an annular lip portion 11, and an annular protrusion 12, and is made of an elastomer such as rubber. The gasket main body portion 10 has one end portion 10a along the axis L direction on a stepped surface 21 formed so as to be recessed inwardly (centripetal side) on the outer peripheral surface 20 of the first pipe 2 positioned inside at the fitting portion 4. It is set as the shape by which the side is externally fitted. Further, the annular lip portion 11 extends from the inner peripheral portion 10b of the gasket main body portion 10 so as to incline toward the other end portion 10c side along the inner side and in the axis L direction, and the step surface 21 of the first pipe 2 is thus extended. It is made into the shape contact | abutted to. Further, the annular protrusion 12 is formed on the outer peripheral portion 10 d of the gasket main body portion 10, and has a shape that comes into contact with the inner peripheral surface 30 of the second pipe 3 positioned outside at the fitting portion 4. The annular lip portion 11 has a shape that comes into contact with the stepped surface 21 of the first pipe 2 with elastic deformation, and a two-dot chain line portion in FIG. 2 shows an original shape before the annular lip portion 11 is elastically deformed. .

  In the sealing structure of the present embodiment, the gasket 1 is configured such that the one end 10 a side of the gasket main body 10 is externally fitted to the stepped surface 21 and the annular lip portion 11 contacts the stepped surface 21 with respect to the first pipe 2. It is attached to touch. And the front-end | tip part 3a of the fitting direction a along the axis | shaft L with respect to the 1st piping 2 of the 2nd piping 3 in the fitting part 4 is opened, and it follows the axis | shaft L with respect to the 2nd piping 3 in the 1st piping 2. The front end 2a in the fitting direction b is opened, and the first pipe 2 and the second pipe 3 are fitted together so that both pipes communicate with each other. In the fitted state of the first pipe 2 and the second pipe 3, the annular protrusion 12 of the gasket 1 abuts on the inner peripheral surface 30 of the second pipe, and the fitting of the first pipe 2 with the second pipe 3 is performed. The distal end surface 2aa in the direction b is in contact with the proximal end surface 3b of the second pipe 3 on the proximal end side in the fitting direction a and orthogonal to the fitting direction a. In the present embodiment, a stepped surface 32 that is recessed outward (centrifugal side) is connected to the inner peripheral surface 30 of the second pipe 3 via the inclined surface 31 on the tip 3 a side of the second pipe 3. Yes. Further, an enlarged tapered second inclined surface 33 that is gradually recessed outward is further connected to the tip end 3 a side of the step surface 32. In the present embodiment, the inner diameter and the outer diameter of the first pipe 2 and the second pipe 3 are both the same, but the end portion 2a side portion of the first pipe 2 in the fitting portion 4 has a smaller diameter than the other portions. It is said that. Moreover, the 2nd piping 3 in the fitting part 4 is made larger diameter than another part. In this way, the gasket 1 is configured to be housed in the space S due to the difference in diameter between the outer diameter of the first pipe 2 and the inner diameter of the second pipe 3 in the fitting portion 4.

  In the sealing structure of the gasket 1 configured as described above and the fitting portion 4 of the first pipe 2 and the second pipe 3 using the gasket 1, the gasket 1 is an annular shape of the first pipe 2 and the second pipe 3. It is attached to the inner and outer fitting portions 4 of. When mounting the gasket 1, first, the gasket 1 is fitted on the stepped surface 21 of the first pipe 2. Specifically, the gasket 1 is externally fitted to the step surface 21 of the first pipe 2 through the one end portion 10a side of the gasket main body portion 10 along the fitting direction a. The external fitting with respect to the step surface 21 is performed so that the one end portion 10a side of the gasket main body 10 abuts against the cut wall portion 210 of the step surface 21. Therefore, the gasket 1 is externally fitted in a stable state integrated with the first pipe 2. Further, at the time of this external fitting, the annular lip portion 11 abuts on the step surface 21 of the first pipe 2 with elastic deformation. At this time, the annular lip portion 11 extends from the inner peripheral portion 10b of the gasket main body portion 10 so as to be inclined inwardly and toward the other end portion 10c (see the two-dot chain line portion), so Contact with elastic deformation is reduced in resistance.

Next, the second pipe 3 is fitted to the first pipe 2 along the fitting direction a. At the time of this fitting, since the tapered second inclined surface 33 continuous with the inner peripheral surface 30 is formed on the distal end portion 3a side of the second pipe 2, the second inclined surface 33 functions as a guide surface, The initial operation of fitting is performed smoothly. When the fitting operation is further advanced, the annular protrusion 12 formed on the gasket 1 smoothly comes into contact with the inner peripheral surface 30 through the step surface 32 and the inclined surface 31 in a state where resistance is suppressed. In addition, the fitting operation is such that the distal end surface 2aa of the first pipe 2 with respect to the second pipe 3 in the fitting direction b is at the base end side in the fitting direction a in the fitting portion 4 of the second pipe 3 and the fitting. It is made to contact | abut to the base end surface 3 orthogonal to the direction a. Thereby, the mutual fitting of the first pipe 2 and the second pipe 3 is accurately positioned at a predetermined position. Further, when a medium or the like to be sealed flows in the first pipe 2 and the second pipe 3, the internal pressure of the medium is not easily applied to the annular lip portion 11, and the occurrence of inversion due to the internal pressure of the annular lip portion 11 is effective. Is suppressed.
Note that the gasket 1 may be attached by fitting the first pipe 2 after fitting the inner circumference of the second pipe 3.

  In the fitting portion 4 of the first pipe 2 and the second pipe 3 through such a gasket 1, the contact portion and the annular protrusion of the annular lip portion 11 with respect to the step surface 21 (inner peripheral surface 20) in the first piping 2. Sealing is made at two locations on the second pipe 3 of the portion 12 in contact with the inner peripheral surface 30. Therefore, while keeping the assembly load of the gasket 1 low, it is possible to prevent external leakage of the medium flowing through both the pipes 2 and 3, and to prevent the external medium from entering the both pipes 2 and 3. Seal performance is maintained. In particular, since the assembly load is low, the fitting portion 4 of the first pipe 2 and the second pipe 3 is hardly deformed although it is made of synthetic resin, which is extremely useful. Moreover, since the outer peripheral portion of the gasket main body portion 10 does not adhere to the inner peripheral surface 30 of the second pipe 3 over the entire width in the fitting direction a (b), internal stress applied to the annular lip portion 11 at the time of assembly. Is alleviated by deformation of the gasket body 10. As a result, there is less concern that cracks due to stress concentration occur at the base of the annular lip portion 11. Further, the outer peripheral portion 10d on the opposite side to the annular lip portion 11 in the gasket main body portion 10 is provided with the annular protrusion 12 that abuts on the inner peripheral surface 30 of the second pipe 3, so that the assembly load is small. However, the surface pressure between the first pipe 2 and the second pipe 3 via the gasket 1 is increased, and the sealing performance by the gasket 1 is maintained well.

  3 and 4 show a second embodiment of a gasket according to the present invention and a sealing structure using the gasket. In the present embodiment, the stepped surface 21 formed on the outer peripheral surface 20 of the first pipe 2 has a first stepped surface 21 a formed so as to be recessed inward (centripetal side) on the outer peripheral surface 20 of the first pipe 2. The second step surface 21b is connected to the first step surface 21a so as to be recessed further inwardly in the fitting direction b with respect to the second pipe 3 than the first step surface 21a. And the gasket 1 is comprised so that the one end part 10a side of the gasket main-body part 10 may externally fit to the 1st level | step difference surface 21a with respect to the 1st piping 2, and the cyclic | annular lip part 11 may contact | abut to the 2nd level | step difference surface 21b. ing. In the present embodiment, the first step surface 21 a and the second step surface 21 b are further connected via the inclined surface 22. Other configurations are the same as those of the first embodiment.

In the second embodiment configured as described above, the one end portion 10a side of the gasket main body portion 10 is externally fitted to the first step surface 21a constituting the two-step shape step surface 21 in the first pipe 2. Assembling property of the gasket 1 is stabilized. Further, since the annular lip portion 11 abuts on the second step surface 21b constituting the two-stepped step surface 21, when a medium or the like as a sealing object flows in the first pipe 2 and the second pipe 3, Even if the internal pressure of the medium is applied to the annular lip portion 11, it is blocked by the step portion (inclined surface 22) between the first step surface 21a and the second step surface 21b, and the inversion of the annular lip portion 11 is less likely to occur. . Further, since the first step surface 21 a and the second step surface 21 b are connected via the inclined surface 22, when the first pipe 2 and the second pipe 3 are fitted through the gasket 1, the gasket When the one end 10a side of the main body 10 is externally fitted to the first stepped surface 21a, the gasket 1 is smoothly mounted on the first pipe 2 by keeping the one end 10a side of the gasket main body 10 along the inclined surface 22. Can be made.
Since other configurations are the same as those of the first embodiment, common portions are denoted by the same reference numerals, and descriptions of operations and effects thereof are omitted.

5 and 6 show a modification of the second embodiment and another modification. In these modified examples, an outward hook-shaped portion 2ab is formed at the distal end portion 2a in the fitting direction b of the first pipe 2 with respect to the second pipe 3. Both differ only in the shape of the hook-shaped part 2ab, and the function described later as the hook-shaped part 2ab is similarly exhibited. That is, in the example of FIG. 5, the lower surface of the hook-shaped portion 2ab (the surface facing the fitting direction b) is a tapered surface that gradually increases in diameter along the fitting direction b. In this example, the hook-shaped part 2ab is formed in a disk shape. Thus, the presence of the flange-shaped portion 2ab makes the distal end surface 2aa wider than in the above example, whereby the distal end surface 2aa of the first pipe 2 and the proximal end surface 3b of the second pipe 3 are in contact with each other. When the contact area becomes large and a medium or the like as a sealing target flows in the first pipe 2 and the second pipe 3, the internal pressure of the medium is less likely to be applied by the annular lip portion 11, and the internal pressure of the annular lip portion 11 depends on the internal pressure. The function of suppressing the occurrence of inversion is more effectively exhibited.
Since other configurations are the same as those of the second embodiment, common portions are denoted by the same reference numerals, and descriptions of operations and effects thereof are omitted.

FIG. 7 shows still another modification of the second embodiment. In this example, the second pipe 3 has a larger diameter than the first pipe 2, and the outer diameter surface of the fitting part 4 in the second pipe 3 is flush with the outer diameter surface of the other part of the second pipe 3. Thus, an inward hook-shaped portion 3 c is formed from the inner peripheral surface 30 of the fitting portion 4. The lower surface (surface on the fitting direction a side) of the hook-shaped portion 3c is a base end surface 33ca in the fitting direction a in the same manner as described above, and a space portion S in which the gasket 1 can be accommodated in a lower portion of the base end surface 33ca. Is formed. The base end surface 3ca is in contact with the distal end surface 2aa of the first pipe 2 in a state where the first pipe 2 and the second pipe 3 are fitted, as in the above example. Therefore, the same function as described above is achieved by the contact relationship between the distal end surface 2aa of the first pipe 2 and the proximal end surface 3ca of the second pipe 3.
Since the other configuration is the same as that of the second embodiment, the same reference numerals are given to the common parts, and the description of the operation and effect is omitted here.

  In the above embodiment, the first member and the second member are the hollow cylindrical first pipe 2 and the second pipe 3, but the present invention is not limited to this, and the casing that opens on one side and the opening are closed. It may be composed of a lid. Moreover, the shape (cross-sectional shape) of the fitting part of the first member, the second member, and both members is not limited to a circle, and may be an ellipse or a substantially square shape. Furthermore, the first member and the second member are not limited to being made of synthetic resin, and may be made of metal, or may be a combination of one made of synthetic resin and the other made of metal. In addition, it is naturally possible to apply the examples shown in FIGS. 5 to 7 to the first embodiment. In addition, other changes can be made to the shape of the gasket and the shape of the fitting portion without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Gasket 10 Gasket main-body part 10a One end part 10b Inner peripheral part 10c Other end part 10d Outer peripheral part 11 Annular lip part 12 Annular protrusion 2 1st piping (1st member)
2a tip part 2aa tip face 20 inner peripheral surface 21 step surface 21a first step surface 21b second step surface 22 inclined surface 3 second pipe (second member)
3a Tip portion 3b, 3ca Base end surface 30 Inner peripheral surface 31 Inclined surface 32 Step surface 33 Second inclined surface 4 Fitting portion a Fitting direction of the second member to the first member b Fitting of the first member to the second member direction

Claims (8)

A gasket made of an elastic material attached to an annular inner and outer fitting portion of two members to be sealed,
An annular gasket main body portion having one end portion fitted on a stepped surface formed to be recessed inwardly on the outer peripheral surface of the first member located on the inner side in the fitting portion of the two members;
An annular lip portion extending from the inner peripheral portion of the gasket main body portion so as to incline toward the inner side and the other end portion side and abuts against the step surface of the first member;
An annular protrusion formed on the outer peripheral portion of the gasket main body so as to contact the inner peripheral surface of the second member located on the outer side of the fitting portion of the two members;
A gasket characterized by comprising: A sealing structure for attaching the gasket according to claim 1 to an annular inner and outer fitting portion of two members to be sealed, and sealing the fitting portion,
The outer peripheral surface of the fitting portion in the first member is a step surface formed to be recessed inward,
The gasket is attached to the first member such that one end portion of the gasket main body part is externally fitted to the step surface, and the annular lip portion is in contact with the step surface.
The front end of the fitting portion in the fitting direction of the second member with respect to the first member is opened, and in the fitted state of the first member and the second member, the annular protrusion of the gasket is the second portion. A front end surface of the first member in a fitting direction of the first member with respect to the second member is a base end side in the fitting direction in the fitting portion of the second member and A sealing structure that abuts against a base end face that is orthogonal to the fitting direction. The sealing structure according to claim 2,
The step surface is further indented inward on the first step surface formed to be recessed inward on the outer peripheral surface of the first member and on the front side in the fitting direction with respect to the second member from the first step surface. A two-step shaped surface with a second step surface connected in this manner,
The gasket is attached to the first member such that one end portion of the gasket main body portion of the gasket is fitted on the first step surface and the annular lip portion is in contact with the second step surface. A sealing structure characterized by that. The sealing structure according to claim 3,
The sealing structure, wherein the first step surface and the second step surface of the first member are connected via an inclined surface. In the sealing structure as described in any one of Claims 2-4,
A sealing structure characterized in that a stepped surface that is recessed outward is connected to the inner peripheral surface of the second member on the distal end side of the second member. The sealing structure according to claim 5,
The step structure of the second member is connected to the inner peripheral surface via an inclined surface, and the sealing structure is characterized in that The sealing structure according to claim 5 or 6,
A sealing structure characterized in that a second inclined surface gradually concaved outward is further connected to the tip end side of the step surface of the second member. In the sealing structure according to any one of claims 2 to 7,
The sealing structure according to claim 1, wherein a tip end portion of the first member in the fitting direction with respect to the second member is opened.

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