Gasket and sealing structure incorporating the same

Abstract

The present invention provides a gasket and a sealing structure assembled with the gasket. The annular gasket (10) seals between two components, a first component (1) and a second component (5), which are assembled opposite to each other, and includes: an annular first sealing portion (13) of elasticity, provided on the first component side of the annular core (11), protruding toward the first component side and abutting against the first component; and an annular second sealing portion (21) of elasticity, provided on the second component side of the core, protruding toward the second component side and abutting against the second component, wherein the first sealing portion and the second sealing portion are configured not to overlap when viewed from the opposing direction of the first component and the second component, and are formed to elastically deform in a way that tilts toward the outer diameter side when the two components are assembled.

Description

Technical Field

[0001] The present invention relates to an annular gasket for sealing between two components and a sealing structure incorporating the gasket. Background Technology

[0002] Previously, it was known that there were gaskets with sealing parts that abutted against the first and second components respectively. For example, Patent Document 1 discloses a metal gasket in which a surface pressing layer that is in close contact with a cylinder or cylinder head is provided on the front and back sides of a substrate made of a metal plate, and the center positions of each surface pressing layer are offset from each other in the radial direction. Existing technical documents Patent documents

[0003] Patent Document 1: Japanese Patent No. 2785955 Summary of the Invention The problem that the invention aims to solve

[0004] Patent document 1 disclosed that the height of the face pressure layer can be adjusted to adjust the face pressure of the face pressure layer. However, if the height of the face pressure layer is increased, it is possible that a portion of the circumferential direction of the face pressure layer may tilt and twist in an unexpected direction when the two components are fastened, resulting in a reduction in sealing performance.

[0005] The present invention was made in view of the above-mentioned actual situation, and its object is to provide a gasket that can improve sealing performance and a sealing structure assembled with the gasket. Methods for solving problems

[0006] To achieve the above objectives, the gasket structure 1 of the present invention provides a gasket that is an annular gasket for sealing between two components, a first component and a second component, which are assembled opposite to each other. The gasket is characterized by comprising: an annular first sealing portion of an elastic type, disposed on the side of the first component of an annular core, protruding toward and abutting against the first component; and an annular second sealing portion of an elastic type, disposed on the side of the second component of the core, protruding toward and abutting against the second component. The first sealing portion and the second sealing portion are configured not to overlap when viewed from the opposing direction of the first component and the second component, and are formed to elastically deform in a manner that tilts toward the outer diameter side when the two components are assembled.

[0007] The following description of embodiments reveals that the gasket of the present invention may also have the following dependent structure. (Structure 2) In structure 1, at least one of the first sealing portion and the second sealing portion may have a radial dimension smaller than its dimension along the opposing direction. (Structure 3) In structure 1 or structure 2, the center of the front end of at least one of the first sealing part and the second sealing part in the radial direction is located on the outer diameter side of the radial direction of the base end located on the core side. (Structure 4) In any of structures 1 to 3, the radius of curvature of the corner portion on the outer diameter side of at least one of the first sealing portion and the second sealing portion is smaller than the radius of curvature of the corner portion on the inner diameter side when viewed in radial section. (Structure 5) In any of structures 1 to 4, a groove-shaped recess extending circumferentially may be provided on the outer diameter side of the base end of at least one of the first sealing portion and the second sealing portion. (Structure 6) In any of structures 1 to 5, the gasket may also have an annular third sealing portion with an elastic mechanism. The third sealing portion is disposed on the side of one of the first and second components of the core, protrudes toward and abuts against that component, and the third sealing portion is formed to elastically deform in a way that tilts toward the outer diameter side when the two components are assembled.

[0008] To achieve the above objective, the sealing structure of the present invention comprises a gasket assembled between two opposing components, a first component and a second component, characterized in that the annular sealed portion abutting the first sealing portion on the side of the first component and the annular sealed portion abutting the second sealing portion on the side of the second component do not overlap when viewed from the opposing direction. Invention Effects

[0009] The gasket and the sealing structure assembled with the gasket of the present invention adopt the above-described structure, thereby improving the sealing performance. Attached Figure Description

[0010] Figure 1 This is a schematic longitudinal sectional view illustrating a gasket and a sealing structure assembled with the gasket according to one embodiment of the present invention. Figure 2 (a) is a top view of the same gasket, and (b) is a sectional view along line XX of (a). Figure 3 This is a simplified longitudinal sectional view of the same gasket and sealing structure. Figure 4 (a) and (b) are schematic longitudinal sectional views of gaskets of modified embodiments of the same implementation. Figure 5(a) is a schematic longitudinal sectional view of a gasket in a modified embodiment of the same embodiment, and (b) is a schematic longitudinal sectional view of the gasket and the sealing structure assembled with the gasket. Figure 6 (a) is a schematic longitudinal sectional view of a gasket in a modified embodiment of the same embodiment, and (b) is a schematic longitudinal sectional view of the gasket and the sealing structure assembled with the gasket. Detailed Implementation

[0011] Hereinafter, an example of a gasket according to an embodiment and a sealing structure assembled with the gasket will be described with reference to the accompanying drawings. Additionally, some of the detailed reference numerals used in other figures have been omitted from some of the figures. Figures 1-6 The diagram shows an example of the gasket of this embodiment, an example of the sealing structure assembled with the gasket, and a modified example.

[0012] like Figures 1-3 As shown, the gasket 10 in this embodiment is an annular gasket used to seal between two components, a first component 1 and a second component 5, which are assembled opposite to each other. The gasket 10 includes: an elastic annular first sealing portion 13, which is provided on the side of the annular core 11 on the side of the first component 1, protrudes towards the first component 1, and abuts against the first component 1; and an elastic annular second sealing portion 21, which is provided on the side of the core 11 on the side of the second component 5, protrudes towards the second component 5, and abuts against the second component 5. With this structure, the gasket 10 is positioned between the two components, and by the first sealing portion 13 abutting against the first component 1 and the second sealing portion 21 abutting against the second component 5, a seal can be formed between the two components.

[0013] The first sealing portion 13 and the second sealing portion 21 are configured such that they do not overlap when viewed from the opposing direction of the first component 1 and the second component 5. With such a structure, when the two components are assembled, the portions where the first component 1 abuts against the first sealing portion 13 and the portions where the second component 5 abuts against the second sealing portion 21 are unlikely to overlap when viewed from the opposing direction. Compared to gaskets where the sealing portions on both sides of the core overlap when viewed from the opposing direction, this can alleviate localized stress concentration in the two components. The first sealing portion 13 and the second sealing portion 21 are configured to elastically deform by tilting towards the outer diameter side when assembled with the two components. With this structure, since the first sealing portion 13 and the second sealing portion 21 elastically deform by tilting towards the outer diameter side when the two components are assembled, it is possible to suppress the first sealing portion 13 and the second sealing portion 21 from tilting or twisting in an unexpected direction in the circumferential direction, thereby improving sealing performance. Furthermore, compared to a structure where the sealing position is narrowed by tilting towards the inner diameter side, the sealing position is widened when the two components are assembled, making it less prone to deflection caused by the narrowing diameter, and further reducing the likelihood of twisting, thus further improving sealing performance. Moreover, when the two components are tubular components constituting the fluid flow paths 2 and 6, it is possible to suppress the first sealing portion 13 and the second sealing portion 21 from protruding towards the inner diameter side, thereby making it less likely to obstruct fluid flow.

[0014] like Figure 3 As shown, the sealing structure of the first embodiment consists of a gasket 10 assembled between two opposing components, a first component 1 and a second component 5. In this sealing structure, the annular sealed portion 4, which abuts against the first sealing portion 13 on the first component 1 side, and the annular sealed portion 8, which abuts against the second sealing portion 21 on the second component 5 side, do not overlap when viewed from the opposing direction. With this structure, the same effect as the gasket 10 is achieved. An example of a specific structure will be described below.

[0015] like Figure 1 and Figure 3 As shown, component 1 and component 5 are tubular components constituting flow paths 2 and 6 of the fluid, respectively, and flange portions 3 and 7 are provided at one end connected to the open end of flow paths 2 and 6, respectively. Component 1 is configured such that the diameter of flow path 2 is smaller than the diameter of flow path 6 of component 5, and the diameter of flange portion 3 is smaller than the diameter of flange portion 7 of component 5. Flange portion 3 of component 1 and flange portion 7 of component 5 are positioned opposite each other via a gasket 10. The surface of flange portion 3 of component 1 facing component 5 constitutes the sealed portion 4 that abuts against the first sealing portion 13. The surface of flange portion 7 of component 5 facing component 1 constitutes the sealed portion 8 that abuts against the second sealing portion 21.

[0016] like Figure 2 As shown in (a), the gasket 10 is annular. Figure 1 and Figure 2 As shown in (b), the core 11 of the gasket 10 is an annular plate. A circular through hole 11a is provided in the center of the core 11. The gasket 10 has an annular first sealing base 12 of elasticity fixed to the first component 1 side of the core 11. The first sealing base 12 is configured not to block the through hole 11a of the core 11. A first sealing portion 13 is formed in such a way that it protrudes from the end of the first sealing base 12 on the inner diameter side toward the first component 1 side. The gasket 10 has an annular second sealing base 20 of elasticity fixed to the surface of the second component 5 side of the core 11. The second sealing base 20 is the same as the first sealing base 12, and is formed so as not to block the through hole 11a of the core 11. A second sealing portion 21 is formed in such a way that it protrudes from the end of the second sealing base 20 on the outer diameter side toward the second component 5 side.

[0017] like Figure 2 As shown in (b), the first sealing portion 13 is formed such that its radial dimension decreases as it approaches the protruding front end. That is, for the radial dimension of the first sealing portion 13, the base end 13a is the largest and the front end 13b is the smallest. The radial dimension (the radial dimension of the base end 13a, which becomes the largest part) w1 of the first sealing portion 13 is smaller than the dimension along the opposite direction (the protruding dimension) h1. With such a structure, it is easy to tilt towards the outer diameter side when assembling the two components. Here, the radial dimension w1 of the first sealing portion 13 is the dimension of the base end 13a, which is hypothetically coplanar with the surface of the first sealing base 12 facing the first component 1. Furthermore, the dimension h1 of the first sealing portion 13 along the opposite direction is the dimension from the base end 13a to the protruding front end 13b of the first sealing portion 13. These radial dimensions w1 and the dimension h1 along the opposite direction of the first sealing portion 13 can also be set appropriately so that the first sealing portion 13 can easily tilt towards the outer diameter side.

[0018] The first sealing portion 13 is configured such that the center b1 of the front end 13b in the radial direction is closer to the outer diameter side than the center a1 of the base end 13a on the core 11 side in the radial direction. If such a structure is adopted, the first sealing portion 13 is prone to tilting from the front end 13b side to the outer diameter side when assembling the two components. like Figure 2 As shown in (a), the front end 13b is formed into a ring shape when viewed from the opposite direction (top view). The front end 13b is formed into a flat surface parallel to the radial direction. The base end 13a is also ring-shaped and is concentric with the front end 13b. The first sealing part 13 is formed such that, when viewed from the opposite direction, the imaginary circle formed by the radial center b1 of the front end 13b is located on the outer diameter side of the imaginary circle formed by the radial center a1 of the base end 13a.

[0019] In radial cross-section, the radius of curvature of the corner 16 on the outer diameter side of the base end portion 14 of the first sealing portion 13 is smaller than the radius of curvature of the corner 15 on the inner diameter side. If such a structure is adopted, the first sealing portion 13 tends to have a smaller cross-sectional area in radial cross-section compared to the corner 15 on the inner diameter side, making it easy to tilt towards the outer diameter side when assembling the two components. The inner diameter side corner 15 of the base end portion 14 of the first sealing portion 13 is formed into a concave curved surface that tends towards the outer diameter side as it approaches the first component 1, so as to have the radius of curvature as described above. Furthermore, the outer diameter side corner 16 of the base end portion 14 of the first sealing portion 13 is formed into a concave curved surface that tends towards the outer diameter side as it approaches the second component 5. That is, in radial cross-section, the corner 15 closer to the inner diameter side than the outer diameter side corner 16 is formed into a gently sloping concave curved surface.

[0020] A groove-shaped recess 17 extending circumferentially is provided on the outer diameter side of the base end portion 14 of the first sealing portion 13. With such a structure, when assembling the two components, the first sealing portion 13 can easily tilt to the outer diameter side through the recess 17. The recess 17 is provided as a corner 16 on the outer diameter side of the base end portion 14 of the first sealing portion 13. The recess 17 opens toward the outer diameter side and is provided all around the outer diameter side of the first sealing portion 13. The recess 17 is formed as a concave curved surface such that the bottom of the groove and the groove walls on both sides are connected. The recess 17 is formed to be slightly recessed toward the inner diameter side than the outer diameter side connected to the first component 1 side of the recess 17. The outer diameter side surface (outer circumferential surface) and inner diameter side surface (inner circumferential surface) of the protruding midpoint portion connected to the first component 1 side of the base end portion 14 of the first sealing portion 13 are cylindrical. The front end side portion connected to the first component 1 side of the protruding midpoint portion of the first sealing portion 13 is formed such that its radial dimension decreases as it approaches the first component 1 side. The outer diameter side surface and inner diameter side surface of this front end side portion are formed into inclined surfaces that are inclined toward the radial center b1 of the front end 13b as it approaches the front end 13b.

[0021] The second sealing portion 21 is formed such that its radial dimension gradually decreases as it approaches the protruding front end. That is, for the radial dimension of the second sealing portion 21, the base end 21a is the largest and the front end 21b is the smallest. The radial dimension w2 of the base end 21a of the second sealing part 21 is greater than the radial dimension w1 of the base end 13a of the first sealing part 13. If such a structure is adopted, then... Figure 3As shown, if the gasket 10 is assembled with the second component 5 positioned lower than the first component 1, the elastic deformation of the second sealing portion 21 located on the lower side is less than the elastic deformation of the first sealing portion 13. Furthermore, the second sealing portion 21 is positioned on the outer diameter side of the first sealing portion 13. These factors work together to make it easier for the gasket 10 to maintain a stable posture.

[0022] The second sealing portion 21 differs from the first sealing portion 13 in that its radial dimension w2 is larger than its dimension h2 along the opposing direction. Here, the radial dimension w2 of the second sealing portion 21 is approximately the same as described above, and is the dimension of the base end 21a, which is hypothetically coplanar with the surface of the second sealing base 20 facing the second component 5. Furthermore, the dimension h2 of the second sealing portion 21 along the opposing direction is the dimension from the base end 21a to the front end 21b of the second sealing portion 21 in the protruding direction. The second sealing portion 21 is the same as the first sealing portion 13, with the center b2 of the radially protruding front end 21b positioned closer to the outer diameter than the center a2 of the radially protruding base end 21a. With this structure, even if the radial dimension w2 is larger than the dimension h2 in the opposing direction, the second sealing portion 21 is easily tilted from the front end 21b side to the outer diameter side when assembling the two components. The front end 21b, as described above, is annular when viewed from the opposing direction and is formed as a flat surface parallel to the radial direction. The base end 21a is also annular and concentric with the front end 21b. That is, the second sealing portion 21 is formed such that, when viewed from the opposing direction, the imaginary circle formed by the radial center b2 of the front end 21b is positioned closer to the outer diameter than the imaginary circle formed by the radial center a2 of the base end 21a.

[0023] Unlike the first sealing portion 13, the second sealing portion 21 has an inner diameter side surface that is generally formed as an inclined surface that slopes towards the radial center b2 of the front end 21b. Furthermore, the outer diameter side surface of the protruding midpoint connected to the second component 5 side of the base end portion 22 of the second sealing portion 21 is cylindrical. The outer diameter side surface of the front end portion connected to the outer diameter side surface of the protruding midpoint of the second sealing portion 21 is formed as an inclined surface that slopes towards the radial center b2 of the front end 21b. Unlike the first sealing part 13, the base end portion 22 of the second sealing part 21 has, in radial cross-section, a corner 23 on the inner diameter side and a corner 24 on the outer diameter side with approximately the same radius of curvature. Even with this structure, the inner diameter side of the second sealing part 21 is generally inclined towards the outer diameter side, and the radial center b2 of the protruding front end 21b is located closer to the outer diameter side than the radial center a2 of the base end 21a. This makes it easy for the two parts to tilt towards the outer diameter side when assembled. Furthermore, the outer diameter side of the protruding part midway to the second component 5 side connected to the base end portion 22 of the second sealing part 21 is cylindrical, making it easy for the two parts to tilt towards the outer diameter side when assembled.

[0024] like Figure 1 and Figure 3 As shown, the gasket 10 is assembled such that the through hole 11a of the core 11 is substantially concentric with the flow path 2 of the first component 1 and the flow path 6 of the second component 5. If a load is applied to the gasket 10 assembled between the two components along the opposing directions of the two components, then as... Figure 3 As shown, the first sealing portion 13 and the second sealing portion 21 are elastically deformed by tilting towards the outer diameter side. In the illustration, an example is shown where the first sealing portion 13 tilts towards the outer diameter side with its outer diameter side surface in contact with the first sealing base 12. On the other hand, an example is shown where the second sealing portion 21 tilts towards the outer diameter side to the extent that it does not contact the second sealing base 20. The sealed portion 4, which abuts against the elastically deformed first sealing portion 13, and the sealed portion 8, which abuts against the second sealing portion 21, which abuts against the flange portion 7, are configured not to overlap when viewed from opposite directions. Furthermore, the inner diameter of the sealed portion 8 of the second component 5 is larger than the outer diameter of the sealed portion 4 of the first component 1. Thus, even if the inner and outer diameters of the flange portions 3 and 7 are different, the first component 1 and the second component 5 can be sealed using the gasket 10 with the structure described above.

[0025] Secondly, refer to Figures 4-6 The gaskets in the modified examples will be explained. In the following variations, the differences from the previously described examples are mainly explained, while descriptions of identical structures are omitted or briefly explained. In the variations, descriptions of those achieving the same effect as the previously described examples are also omitted or briefly explained.

[0026] Figure 4 (a) schematically represents the gasket 10A of the first modified example. The main difference between this gasket 10A and the example described above is the structure of the recess 17A in the first sealing portion 13A and the recess 25 provided in the second sealing portion 21A. The inner diameter side of the first sealing portion 13A, which is closer to the first component 1 than the inner diameter side of the corner 15, is generally cylindrical. Furthermore, a recess 17A, which is recessed towards the inner diameter side than in the example described above, is provided on the outer diameter side of the base end portion 14 of the first sealing portion 13A. This recess 17A is a square groove in radial cross-section, divided on one side by the first sealing base 12 in the groove width direction, and on the other side by a groove wall 17b opposite to the first sealing base 12. The bottom of the groove is divided by a cylindrical groove bottom 17a facing the outer diameter side. This groove bottom 17a is positioned approximately at the radial center b1 of the front end 13b of the first sealing portion 13A. In the illustration, the groove bottom 17a is positioned slightly closer to the inner diameter side than the radial center b1 of the front end 13b of the first sealing portion 13A. The radial dimension of the base end portion 14 of the first sealing portion 13A, which is provided with the recessed portion 17A, is smaller than the radial dimension w1 of the entire first sealing portion 13A.

[0027] The second sealing portion 21A is substantially the same as the first sealing portion 13A, and is generally cylindrical on the inner diameter side surface closer to the second component 5 than the corner portion 23 on the inner diameter side. In the illustration, the front end of the inner diameter side surface is formed as an inclined surface that tends toward the radial center b2 of the front end 21b as it tends toward the front end 21b. A recess 25 opening towards the outer diameter side is provided on the outer diameter side of the base end portion 22 of the second sealing portion 21A. This recess 25 is substantially the same as the recess 17A of the first sealing portion 13A, and is square groove-shaped in radial cross-section. One side of the groove width direction of the recess 25 is divided by the second sealing base 20, and the other side is divided by the groove wall 25b opposite to the second sealing base 20. The bottom of the groove is divided by a cylindrical groove bottom 25a facing the outer diameter side. The groove bottom 25a is located at a position substantially consistent with the radial center b2 of the front end 21b of the second sealing portion 21A. In the illustration, the groove bottom 25a is located slightly towards the outer diameter side than the radial center b2 of the front end 21b of the second sealing portion 21A. The radial dimension of the base end portion 22 of the second sealing portion 21A with the recess 25 is smaller than the radial dimension w2 of the entire second sealing portion 21A. The gasket 10A with the above structure is configured such that when assembled with the first component 1 and the second component 5, it can easily be elastically deformed by tilting towards the outer diameter side with the base ends 14 and 22 as the starting point.

[0028] Figure 4 (b) schematically represents the gasket 10B of the second variation. The main difference between this gasket 10B and the examples described above is that a first sealing portion 13B is provided via a first protruding base 18 protruding from the first sealing base 12 toward the first component 1, and a second sealing portion 21B is provided via a second protruding base 26 protruding from the second sealing base 20 toward the second component 5. The first protruding base 18 is formed in an annular shape, protruding from the end of the first sealing base 12 on the inner diameter side toward the first component 1 side. The corners of the first protruding base 18 on the inner diameter side and the outer diameter side connected to the first sealing base 12 are concave curved surfaces. The inner diameter side and the outer diameter side of the first protruding base 18 near the front end of the corner are formed in a substantially cylindrical shape.

[0029] The first sealing portion 13B is formed in an annular shape at the front end of the first protruding base 18, protruding from the outer diameter side towards the first component 1. The front end face 19 of the inner diameter side of the first protruding base 18, which is connected to the inner diameter side of the first sealing portion 13B, is a flat surface parallel to the radial direction. In this modified example, the radial dimension w1 of the first sealing portion 13B is the dimension of the base end 13a, which is hypothetically coplanar with the front end face 19. Furthermore, the dimension h1 of the first sealing portion 13B in the opposing direction is the dimension from the base end 13a to the front end 13b in the protruding direction of the first sealing portion 13B. In this modified example, the first sealing portion 13B is generally tapered in the protruding direction. That is, the outer diameter side and the inner diameter side of the first sealing portion 13B are formed as inclined surfaces that approach each other as they move toward the front end 13b. Also, as in the example above, the radial center of the front end 13b is located on the outer diameter side compared to the radial center of the base end 13a.

[0030] The second protruding base 26 is formed in an annular shape, protruding from the end of the second sealing base 20 on the outer diameter side toward the second component 5. The corners of the second protruding base 26, which are connected to the second sealing base 20, are concave curved surfaces. The inner and outer diameter sides of the second protruding base 26, which are closer to the front end of the corners, are generally cylindrical in shape. The second sealing portion 21B is formed in an annular shape at the front end of the second protruding base 26, protruding from the outer diameter side towards the second component 5. The front end face 27 of the inner diameter side of the second protruding base 26, which is connected to the inner diameter side of the second sealing portion 21B, is formed as a flat surface parallel to the radial direction, similar to the above. The radial dimension w2 of the second sealing portion 21B is the dimension of the base end 21a, which is hypothetically coplanar with the front end face 27. Furthermore, the dimension h2 of the second sealing portion 21B in the opposing direction is the dimension from the base end 21a to the front end 21b in the protruding direction of the second sealing portion 21B. The second sealing portion 21B is the same as the first sealing portion 13B, and is generally tapered in the protruding direction. Also like the example described above, the radial center of the front end 21b is located on the outer diameter side compared to the radial center of the base end 21a.

[0031] In this modified example, the gasket 10B is also configured such that, when the two components are assembled, the first sealing portion 13B and the second sealing portion 21B elastically deform by tilting towards the outer diameter side. In this gasket 10B, it can also be configured such that, when the two components are assembled, the first protruding base 18 and the second protruding base 26 undergo almost no compressive deformation. That is, this gasket 10B is suitable for assembling two components with a relatively large gap between the first component 1 and the second component 5.

[0032] Figure 5 (a) and (b) schematically represent the gasket 10C of the third variation. The gasket 10C in this modified example also includes an annular third sealing portion 28 with an elastic mechanism. This third sealing portion 28 is disposed on the side of the second component 5, which is one of the first component 1 and the second component 5 that forms the core 11, and protrudes towards and abuts against the second component 5. When the two components are assembled, the third sealing portion 28 elastically deforms by tilting towards its outer diameter. With this structure, the sealing performance can be further improved by forming the third sealing portion 28. like Figure 5 As shown in (a), the gasket 10C is configured to have a... Figures 1-3 The example uses the same first sealing portion 13 and second sealing portion 21, with a third sealing portion 28 provided on the inner diameter side of the second sealing portion 21. The third sealing portion 28, in radial cross-section, is formed to have a shape substantially the same as the second sealing portion 21. Alternatively, the third sealing portion 28 may also be formed to have a different shape from the second sealing portion 21 in radial cross-section. The third sealing portion 28 is configured such that its front end 28a is located on the outer diameter side of the front end 13b of the first sealing portion 13. That is, the third sealing portion 28 is configured such that its front end 28a and the front end 13b of the first sealing portion 13 do not overlap when viewed from opposite directions.

[0033] like Figure 5 As shown in (b), in this modified example, in the second component 5A where the gasket 10C is assembled, the diameter of the flow path 6A is smaller than the diameter of the second component 5. Correspondingly, the inner circumferential end of the flange portion 7A, which is connected to the open end of the flow path 6A, is positioned closer to the inner diameter than described above. The third sealing portion 28 abuts against the inner diameter portion of the flange portion 7A, thereby achieving a seal. Thus, the gasket 10C of this modified example is suitable for sealing a relatively large area of ​​the second component 5A. If gasket 10C is assembled between the first component 1 and the second component 5A, the third sealing part 28, similar to the first sealing part 13 and the second sealing part 21, elastically deforms by tilting towards the outer diameter side. The annular sealed part 4 that the first sealing part 13 of the first component 1 abuts against and the annular sealed part 9 that the third sealing part 28 of the second component 5 abuts against each other overlap when viewed from the opposing direction. Due to this structure, compared to the gasket described above, there is a tendency for stress to concentrate locally in the two components (sealed parts 4 and 9), but compared to a gasket where the front ends of the sealing parts on both sides of the core overlap when viewed from the opposing direction, it can mitigate the local concentration of stress in the two components.

[0034] Figure 6 (a) and (b) schematically represent the gasket 10D of the fourth variation. In this modified example, the gasket 10D differs from the third modified example described above, and is configured such that a third sealing portion 29 is provided on the side of the first component 1, which is one of the first component 1 and the second component 5 that forms the core 11. The third sealing portion 29 is formed on the outer diameter side of the first sealing portion 13 in such a way that it protrudes from the first sealing base 12 toward the first component 1. In radial cross-section, the third sealing portion 29 is formed to have a shape substantially the same as the first sealing portion 13. Alternatively, the third sealing portion 29 may also be formed to have a different shape from the first sealing portion 13 in radial cross-section. The third sealing part 29 is configured such that its front end 29a is located on the inner diameter side of the front end 21b of the second sealing part 21. That is, the third sealing part 29 is configured such that its front end 29a and the front end 21b of the second sealing part 21 do not overlap when viewed from the opposite direction.

[0035] like Figure 6 As shown in (b), in this modified example, in the first component 1A where the gasket 10D is assembled, the outer diameter of the flange portion 3A is approximately the same as that of the flange portion 7 of the second component 5, and is greater than... Figure 1 and Figure 3 The outer diameter of the flange portion 3 of the first component 1 is shown. The third sealing portion 29 abuts against the outer diameter side of the flange portion 3A to achieve a seal. Thus, the gasket 10D of this modified example is suitable for sealing the first component 1A, which has a relatively large sealing area. If the gasket 10D is assembled between the first component 1A and the second component 5, then, similar to the first sealing part 13 and the second sealing part 21, the third sealing part 29 elastically deforms by tilting towards the outer diameter side. The annular sealed part 8 that the second sealing part 21 of the second component 5 abuts against and the annular sealed part 9A that the third sealing part 29 of the first component 1A abuts against each other overlap when viewed from the opposing direction. Even with this structure, similar to the third variation described above, compared to the gasket where the front ends of the sealing parts on both sides of the core overlap when viewed from the opposing direction, it can mitigate the localized concentration of stress on the two components.

[0036] The different structures described in the above embodiments can be appropriately modified, reassembled, or combined as needed. Furthermore, the components are not limited to the structures described above. For example, each sealing portion can be configured to have an inner diameter side and an outer diameter side that gradually taper from the base end to the front end. Furthermore, the shape of the front end of each sealing portion is not limited to a flat surface parallel to the radial direction; it can also be an arc shape or a triangular shape in radial cross-section. Moreover, it is possible to have more sealing portions. Furthermore, the overall shape of the gasket only needs to be annular, and is not limited to a circular shape. Furthermore, the first and second components are not limited to tubular components; they can also be components without flow paths. Explanation of reference numerals in the attached figures:

[0037] 1, 1A: First component; 4: Sealed part; 5, 5A: Second component; 8: Sealed part; 11: Core; 10-10D: Gasket; 13-13B: First sealing part; 13a: Base end; 13b: Front end; 14: Base end; 15, 16: Corner; 17: Recess; 21-21B: Second sealing part; 21a: Base end; 21b: Front end; 22: Base end; 23, 24: Corner; 25: Recess; 28, 29: Third sealing part; w1, w2: Dimensions along the radial direction; h1, h2: Dimensions along the opposing direction; a1, a2: Center of the base end in the radial direction; b1, b2: Center of the front end in the radial direction in the protruding direction.

Claims

1. A gasket, an annular gasket used to seal between two components, a first component and a second component, assembled opposite to each other, characterized in that, The gasket includes: a first annular sealing portion of elasticity, disposed on the first component side of the annular core, protruding toward and abutting against the first component; and a second annular sealing portion of elasticity, disposed on the second component side of the core, protruding toward and abutting against the second component. The first sealing portion and the second sealing portion are configured not to overlap when viewed from the opposing direction of the first component and the second component, and are formed to elastically deform in a way that tilts towards the outer diameter side when the two components are assembled.

2. The gasket according to claim 1, characterized in that, At least one of the first sealing portion and the second sealing portion has a radial dimension smaller than its dimension along the opposite direction.

3. The gasket according to claim 1 or 2, characterized in that, The center of the radially protruding front end of at least one of the first sealing part and the second sealing part is located on the outer diameter side of the base end located on the core side.

4. The gasket according to claim 1 or 2, characterized in that, In radial cross-section, the radius of curvature of the corner portion on the outer diameter side of at least one of the first sealing portion and the second sealing portion is smaller than the radius of curvature of the corner portion on the inner diameter side.

5. The gasket according to claim 1 or 2, characterized in that, A groove-shaped recess extending circumferentially is provided on the outer diameter side of the base end of at least one of the first sealing part and the second sealing part.

6. The gasket according to claim 1 or 2, characterized in that, The gasket also has an annular third sealing portion with an elastic mechanism, which is disposed on one of the first and second components of the core, protruding towards and abutting against that component. The third sealing part is formed to elastically deform by tilting towards the outer diameter side when the two components are assembled.

7. A sealing structure comprising a gasket as described in claim 1 or 2 assembled between two opposing first and second components, characterized in that, The annular sealed portion abutting the first sealing portion on the first component side and the annular sealed portion abutting the second sealing portion on the second component side do not overlap when viewed from the opposing direction.

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