Gasket and sealing structure

Abstract

To provide a gasket having sufficient sealing performance with low reaction force and applicable even if a groove width of a mounting groove is small.SOLUTION: A gasket 3 is held between a first member 1 including a sealing surface 10 in which a mounting groove 11 is formed and a second member 2 facing the sealing surface 10 in a state of being housed in the mounting groove 11. The outer peripheral surface of the gasket 3 includes a first surface 31 and a second surface 32, the first surface 31 is inclined so as to expand in diameter toward the depth direction of the installation groove 11, and the second surface 32 is provided in the depth direction of the installation groove 11 from the first surface 31 and is inclined so as to contract in diameter toward the depth direction of the installation groove 11.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] TECHNICAL FIELD The present disclosure relates to gaskets and sealing structures. [Background technology]

[0002] Conventionally, gaskets have been used in automotive components, such as flow path switching control valves and water pumps, to seal the gap between two components and improve sealing performance. The gasket is housed in a mounting groove provided in at least one of the two components and is sandwiched between the two components. In recent years, resins have become more common as the material for components, and due to concerns about deformation of the components when the gasket is sandwiched between them, gaskets are required to have low reaction force. While the cross-sectional shapes traditionally used for gaskets are octagonal or bifurcated, a lip-shaped cross-sectional shape is one that aims to reduce reaction force compared to conventional designs. For example, Patent Document 1 discloses a lip-shaped gasket that is capable of high compression with low reaction force. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5126423 Summary of the Invention [Problem to be solved by the invention]

[0004] Lip-shaped gaskets have lower reaction force than octagonal or bifurcated gaskets. However, they have the problem that the groove width of the mounting groove must be larger than that of octagonal or bifurcated gaskets. As components become increasingly miniaturized, there are often limitations on the groove width of the mounting groove. Furthermore, lip-shaped gaskets have inferior sealing properties to octagonal gaskets. In consideration of the above circumstances, one aspect of the present disclosure aims to provide a gasket that has sufficient sealing properties with low reaction force and is applicable even when the groove width of the mounting groove is small. [Means for solving the problem]

[0005] In order to solve the above problems, one embodiment of the gasket of the present disclosure is a gasket that is sandwiched between a first member including a sealing surface on which a mounting groove is formed and a second member facing the sealing surface, while being accommodated in the mounting groove, and is characterized in that the height dimension of the gasket is greater than the depth dimension of the mounting groove, the outer surface of the gasket includes a first surface and a second surface, the first surface is inclined so as to expand in diameter in the depth direction of the mounting groove, and the second surface is provided in the depth direction of the mounting groove from the first surface and is inclined so as to contract in diameter in the depth direction of the mounting groove.

[0006] A gasket according to one aspect of the present disclosure is a gasket that is sandwiched between a first member including a sealing surface on which a mounting groove is formed and a second member facing the sealing surface, while being housed in the mounting groove. The gasket includes an inner circumferential surface and an outer circumferential surface, a first corner portion located at the end of the portion where the inner circumferential surface and the outer circumferential surface are connected that is closest to the first member, and a second corner portion located on the opposite side of the portion where the inner circumferential surface and the outer circumferential surface are connected.When the second corner portion is pressed in the depth direction of the mounting groove by the second member, the second corner portion and the outer circumferential surface are displaced outward while the first corner portion contacts the inner wall surface on the inside of the mounting groove, so that the outer circumferential surface contacts the inner wall surface on the outside of the mounting groove.

[0007] A sealing structure according to one embodiment of the present disclosure comprises a first member, a second member, and a gasket, wherein the first member includes a sealing surface having a mounting groove formed therein, and the second member faces the sealing surface, the gasket is sandwiched between the first member and the second member while housed in the mounting groove, the height dimension of the gasket is greater than the depth dimension of the mounting groove, the gasket has a first surface and a second surface on its outer circumferential surface, and before the gasket is sandwiched between the first member and the second member, the first surface is inclined so as to expand in diameter in the depth direction of the mounting groove, the second surface is provided in the depth direction of the mounting groove from the first surface and is inclined so as to contract in diameter in the depth direction of the mounting groove, there is a gap between the first surface and the outer inner wall surface of the mounting groove, and there is a gap between the second surface and the bottom surface of the mounting groove. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view of the sealing structure according to the first embodiment. [Figure 2] 3 is a schematic diagram of an interior angle formed between a first surface and a second surface of the gasket according to the first embodiment. FIG. [Figure 3] 3 is a cross-sectional view of the sealing structure according to the first embodiment, showing a state in which a gasket is sandwiched between a first member and a second member to seal the gap between them to a minimum extent. FIG. [Figure 4] 3 is a cross-sectional view of the sealing structure according to the first embodiment, showing a state in which a gasket is sandwiched between a first member and a second member to seal the gap between them. FIG. [Figure 5] 3 is a cross-sectional view of the sealing structure according to the first embodiment, showing a state in which a gasket is sandwiched between a first member and a second member in contact with each other. FIG. [Figure 6] FIG. 10 is a cross-sectional view of a sealing structure according to a first modified example. [Figure 7] FIG. 10 is a cross-sectional view of a sealing structure according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] The embodiments for carrying out the present disclosure will be described with reference to the drawings. Note that the dimensions and scale of each element in each drawing may differ from those of the actual product. Furthermore, the embodiment described below is an exemplary embodiment that may be envisioned when carrying out the present disclosure. Therefore, the scope of the present disclosure is not limited to the embodiment exemplified below.

[0010] A: First embodiment FIG. 1 is a cross-sectional view of a sealing structure 100 according to a first embodiment.

[0011] The sealing structure 100 in the first embodiment includes a first member 1, a second member 2, and a gasket 3. The first member 1 and the second member 2 are housings that constitute mechanical components such as a flow path switching control valve or a water pump.

[0012] A gasket 3 is sandwiched in the gap between the first member 1 and the second member 2. Therefore, the gap between the first member 1 and the second member 2 is divided into a space inside the gasket 3 (hereinafter referred to as the "inner space 4") and a space outside the gasket 3 (hereinafter referred to as the "outer space 5"). When the sealing structure 100 is actually used, the pressure of the liquid flowing through the inner space 4 makes the pressure in the inner space 4 higher than the pressure in the outer space 5.

[0013] In the following description, the vertical direction in FIG. 1 is referred to as the Z axis. One direction of the Z axis is referred to as the Z1 direction, and the other direction is referred to as the Z2 direction. The Z1 direction is the direction from the second member 2 to the first member 1, and is an example of the "depth direction." The Z axis can also be expressed as an axis extending in the height direction of the gasket 3.

[0014] Examples of materials for the first member 1 include resin materials such as polyphenylene sulfide (PPS) and polyamide 66 (PA66). The first member 1 includes a sealing surface 10. The sealing surface 10 is a plane perpendicular to the Z axis and faces the Z2 direction. Note that the sealing surface 10 may be, for example, a curved surface or a combination of a flat surface and a curved surface.

[0015] A mounting groove 11 is formed in the sealing surface 10. The mounting groove 11 is a loop-shaped recess formed with a constant width. The cross-sectional shape of the mounting groove 11 is rectangular. The mounting groove 11 includes an inner wall surface 13a of the inner space 4, an inner wall surface 13b of the outer space 5, and a bottom surface 12. The inner wall surfaces 13a and 13b are side surfaces along the Z axis. The inner wall surfaces 13a and 13b include arc surfaces centered on a central axis parallel to the Z axis, or flat surfaces along the Z axis. The bottom surface 12 is a flat surface connecting the inner wall surfaces 13a and 13b. The bottom surface 12 is perpendicular to the Z axis. The portion where the inner wall surface 13a and the bottom surface 12 are connected is rounded. Similarly, the portion where the inner wall surface 13b and the bottom surface 12 are connected is rounded. The term "R-shaped" means that the surfaces are connected by a continuous, rounded curved surface (for example, a circular arc surface).

[0016] Examples of materials for the second member 2 include resin materials such as polyphenylene sulfide (PPS) and polyamide 66 (PA66). The second member 2 includes a sealing surface 20. The sealing surface 20 is a flat surface facing the sealing surface 10 of the first member 1. However, the sealing surface 20 may also be a curved surface, or a combination of a flat surface and a curved surface.

[0017] The gasket 3 is an elastically deformable loop-shaped sealing member. The gasket 3 is housed in the mounting groove 11. Specifically, the gasket 3 is sandwiched between the first member 1 and the second member 2.

[0018] The cross-sectional shape of the gasket 3 is roughly triangular. The corners of the triangle are corner 30U, which protrudes slightly inward from the Z2 direction, corner 30L, which protrudes toward inner wall surface 13b, and corner 30R, which protrudes toward the portion where inner wall surface 13a and bottom surface 12 are connected.

[0019] The distance along the Z axis between the apex of the corner 30U and the bottom surface 12 is defined as the height dimension Ha of the gasket 3. The distance along the Z axis between the sealing surface 10 of the first member 1 and the bottom surface 12 is defined as the depth dimension Hb of the mounting groove 11. The height dimension Ha of the gasket 3 is greater than the depth dimension Hb of the mounting groove 11. Therefore, a portion of the gasket 3, including the corner 30U located in the Z2 direction, protrudes from the mounting groove 11 in the Z2 direction when the gasket 3 is housed in the mounting groove 11. In other words, the corner 30U is located further in the Z2 direction than the sealing surface 10.

[0020] The width dimension Wa of the gasket 3 is smaller than the width dimension Wb of the mounting groove 11. Therefore, when the gasket 3 is accommodated in the mounting groove 11, the gasket 3 is less likely to come into contact with the inner wall surfaces 13a and 13b, compared to a configuration in which the width dimension Wa of the gasket 3 is equal to or greater than the width dimension Wb of the mounting groove 11, making it easier to accommodate the gasket 3.

[0021] The gasket 3 is formed of an elastic material such as a rubber material. Examples of the rubber material used for the gasket 3 include various rubber materials such as chloroprene rubber (CR), silicone rubber (SR), acrylic rubber (ACM), urethane rubber (U), polyurethane rubber (PUR), vinyl methyl silicone rubber (VMQ), ethylene propylene diene rubber (EPDM), and fluororubber (FKM).

[0022] The gasket 3 includes a side surface (hereinafter referred to as the "outer peripheral surface 7") facing the outer space 5 and a side surface (hereinafter referred to as the "inner peripheral surface 6") facing the inner space 4. The outer peripheral surface 7 includes a first surface 31 and a second surface 32. The inner peripheral surface 6 includes a third surface 33.

[0023] The first surface 31 is inclined so as to increase in diameter in the Z1 direction. That is, the diameter of the first surface 31 at the end in the Z1 direction is larger than the diameter of the first surface 31 at the end in the Z2 direction. Therefore, a gap is provided between the first surface 31 and the inner wall surface 13b. In the first embodiment, a configuration in which the first surface 31 increases in diameter linearly is exemplified. However, the first surface 31 may increase in diameter in a curved line, for example.

[0024] The second surface 32 is located on the outer peripheral surface 7 of the gasket 3 in the Z1 direction relative to the first surface 31. The second surface 32 is inclined so that its diameter decreases in the Z1 direction. That is, the diameter of the second surface 32 at the end of the Z1 direction is smaller than the diameter of the second surface 32 at the end of the Z2 direction. Therefore, a gap is formed between the second surface 32 and the bottom surface 12 of the mounting groove 11. In the first embodiment, a configuration in which the second surface 32 decreases in diameter in a linear manner is exemplified. However, the second surface 32 may decrease in diameter in a curved manner, for example.

[0025] As shown in Fig. 2, the interior angle α between the first surface 31 and the second surface 32 is an obtuse angle. Also, as shown in Fig. 1, the aforementioned corner 30L is a portion where the first surface 31 and the second surface 32 are connected. The corner 30L is rounded. The rounded shape indicates that the corners are connected by a continuous, rounded curved surface (for example, a circular arc surface).

[0026] The third surface 33 is an arc-shaped curved surface. Specifically, the third surface 33 is curved concavely toward the outer space 5. The third surface 33 expands in diameter from the end in the Z2 direction to a predetermined position in the Z1 direction and then contracts in diameter from there to the end in the Z1 direction. The predetermined position is a midpoint between the end in the Z2 direction and the end in the Z1 direction on the third surface 33. In the first embodiment, a configuration in which the third surface 33 contracts in diameter in a curved manner to the predetermined position is exemplified. However, the third surface 33 may, for example, contract in diameter linearly to the predetermined position. Similarly, a configuration in which the third surface 33 expands in diameter in a curved manner from the predetermined position is exemplified. However, the third surface 33 may, for example, expand in diameter linearly from the predetermined position. Furthermore, a gap is provided between the corner 30R and the inner wall surface 13a.

[0027] The aforementioned corner 30R is a portion where the second surface 32 and the third surface 33 are connected. The aforementioned corner 30U is a portion where the first surface 31 and the third surface 33 are connected. That is, among the portions where the inner circumferential surface 6 and the outer circumferential surface 7 are connected, the corner 30R is located at the end closest to the first member, and the corner 30U is located on the opposite side of the corner 30R. The corner 30R is an example of a "first corner," and the corner 30U is an example of a "second corner." The corners 30R and 30U are each rounded. The rounded shape indicates that they are connected by a continuous, rounded curved surface (e.g., a circular arc surface).

[0028] 3 to 5 are explanatory views of the process of installing the gasket 3 between the first member 1 and the second member 2 in the sealing structure 100 according to this embodiment. As the state transitions from that shown in Fig. 3 to that shown in Fig. 5, the distance between the sealing surface 10 of the first member 1 and the sealing surface 20 of the second member 2 becomes narrower.

[0029] 3 , when the gasket 3 of this embodiment is sandwiched between the first member 1 and the second member 2 while housed in the mounting groove 11, the corner 30U first comes into contact with the sealing surface 20, and the gasket 3 in contact with the sealing surface 20 is pressed in the Z1 direction. Pressing in the Z1 direction displaces the entire gasket 3 so that the corner 30L comes into contact with the inner wall surface 13b and the corner 30R comes into contact with the inner wall surface 13a. When the gasket 3 is further pressed, the first surface 31 comes into contact with the inner wall surface 13b, with the corner 30L serving as a fulcrum, and the second surface 32 comes into contact with the bottom surface 12.

[0030] As shown in Figure 4, when the distance between the first member 1 and the second member 2 is narrower than that in Figure 3 and the gasket 3 is clamped, the gasket 3 elastically deforms to further fill the gap between the corner 30R and the inner wall surface 13a, the gap between the second surface 32 and the bottom surface 12, and the gap between the first surface 31 and the inner wall surface 13b.

[0031] 5, when the first member 1 and the second member 2 are clamped in a contacting state, the gap between the second surface 32 and the bottom surface 12, and the gap between the first surface 31 and the inner wall surface 13b are almost entirely filled with the elastically deformed gasket 3. As described above, in the gasket 3 of this embodiment, the contact area with the first member 1 is increased, the load acting on the gasket 3 is dispersed, the reaction force of the gasket 3 is reduced, and the performance of sealing the gap between the first member 1 and the second member 2 is improved.

[0032] B: Modified example Specific modified embodiments that can be added to each of the embodiments exemplified above are exemplified below. Two or more embodiments arbitrarily selected from the following examples may be appropriately combined within a range that does not contradict each other.

[0033] (1) In the first embodiment, no mounting groove is formed in the sealing surface 20 of the second member 2. However, as long as the sealing performance of the gasket 3 is not impaired, a mounting groove may be formed in the sealing surface 20 of the second member 2. For example, as shown in FIG. 6 , a mounting groove 21 is formed in the sealing surface 20 of the second member 2 at a position facing the mounting groove 11 of the first member 1. The distance along the Z axis between the sealing surface 20 of the second member 2 and the bottom surface 22 of the mounting groove 21 is defined as the depth Hc of the mounting groove 21 of the second member 2. The sum of the depth Hb of the mounting groove 21 of the first member 1 and the depth Hc of the mounting groove 21 of the second member 2 is smaller than the height Ha of the gasket 3. Therefore, when the gasket 3 is placed between the first member 1 and the second member 2, the corner 30U of the gasket 3 is pressed in the Z1 direction by the second member 2.

[0034] (2) In the first embodiment, the third surface 33 is an arc-curved surface, but the third surface 33 is not limited to an arc-curved surface. The shape of the third surface 33 may be, for example, a straight line as shown in FIG. 7 or a wavy line.

[0035] (3) In the first embodiment, the corners 30U are rounded, but the corners 30U are not limited to being rounded. For example, discontinuous corners may be used.

[0036] (4) In the first embodiment, the corners 30L are rounded, but the corners 30L are not limited to being rounded. For example, discontinuous corners may be used.

[0037] (5) In the first embodiment, the corners 30R are rounded, but the corners 30R are not limited to being rounded. For example, discontinuous corners may be used.

[0038] (6) In the first embodiment, the portion where the inner wall surface 13a and the bottom surface 12 are connected is rounded, but the portion where the inner wall surface 13a and the bottom surface 12 are connected is not limited to being rounded. For example, a discontinuous angular shape may be used.

[0039] (7) In the first embodiment, the portion where the inner wall surface 13b and the bottom surface 12 are connected is rounded, but the portion where the inner wall surface 13b and the bottom surface 12 are connected is not limited to being rounded. For example, a discontinuous angular shape may be used.

[0040] (8) The term "nth" (n is a natural number) in this application is used only as a formal and convenient label to distinguish each element in the description and does not have any substantive meaning. Therefore, there is no room for restrictive interpretation of the position of each element or the order of manufacture, etc., based on the term "nth."

[0041] C: Notes From the above-described exemplary embodiments, the following configurations can be understood, for example.

[0042] A gasket according to one aspect (Aspect 1) of the present disclosure is a gasket that is sandwiched between a first member including a sealing surface with a mounting groove formed therein and a second member facing the sealing surface while being accommodated in the mounting groove, wherein the height dimension of the gasket is greater than the depth dimension of the mounting groove, and the outer peripheral surface of the gasket includes a first surface and a second surface, the first surface being inclined so as to increase in diameter in the depth direction of the mounting groove, and the second surface being provided in the depth direction of the mounting groove from the first surface and inclined so as to decrease in diameter in the depth direction of the mounting groove. In the above aspect, a gap is provided between the first surface and an outer inner wall surface of the mounting groove, and a gap is also provided between the second surface and a bottom surface of the mounting groove. With this configuration, when the gasket is sandwiched between the two members, it elastically deforms to fill the gap between the first surface and the outer inner wall surface of the mounting groove and to fill the gap between the second surface and the bottom surface of the mounting groove. Therefore, the contact area with the first member is increased, the reaction force is reduced, and the performance of sealing the gap between the first member and the second member is improved. Note that the depth direction is a first direction from the second member to the first member along the axis of the height direction of the gasket.

[0043] In a gasket according to a specific example (Aspect 2) of Aspect 1, the width dimension of the gasket is smaller than the width dimension of the mounting groove. In the above aspect, the width dimension of the gasket is smaller than the width dimension of the mounting groove. With this configuration, the gasket does not come into contact with the inner wall surface of the mounting groove when mounted. Therefore, it is easier to mount the gasket in the mounting groove compared to a configuration in which the width dimension of the gasket is equal to or larger than the width dimension of the mounting groove.

[0044] In a gasket according to a specific example (Aspect 3) of Aspect 1 or Aspect 2, the interior angle between the first surface and the second surface is an obtuse angle. In the above aspects, the interior angle between the first surface and the second surface is greater than 90° and less than 180°. With this configuration, when the gasket is sandwiched between two members, the gasket that protrudes from the mounting groove is less likely to collapse inward. Therefore, compared to a configuration in which the interior angle between the first surface and the second surface is a right angle or less, the performance of sealing the gap between the first member and the second member is improved.

[0045] In a gasket according to any one of the specific examples (Aspect 4) of Aspects 1 to 3, the gasket includes a third surface on its inner circumferential surface, and the third surface is curved concavely outward. In the above aspects, a gap is formed between the third surface and the inner wall surface of the mounting groove. With this configuration, elastic deformation that fills the gap between the depthwise end of the third surface and the inner wall surface of the mounting groove becomes significant. Therefore, the ability to seal the gap between the first member and the second member is improved.

[0046] In a gasket according to any one of the specific examples (Aspect 5) of Aspects 1 to 4, the portion connecting the first surface and the second surface is rounded. In the above aspects, the portion connecting the first surface and the second surface is rounded. According to the above configuration, when the gasket is sandwiched between two members, the contact area between the gasket and the first member is increased. Therefore, compared to a configuration in which the portion connecting the first surface and the second surface is discontinuously angular, for example, the performance of sealing the gap between the first member and the second member is improved. The portion connecting the first surface and the second surface being rounded means that the inner wall surface of the first surface and the inner wall surface of the second surface are connected by a continuous, rounded curved surface.

[0047] In a gasket according to any one of the specific examples (Aspect 6) of Aspects 1 to 5, the portion connecting the second surface and the third surface is rounded. In the above aspects, the portion connecting the second surface and the third surface is rounded. According to the above configuration, when the gasket is sandwiched between two members, the contact area between the gasket and the first member is increased. Therefore, compared to a configuration in which the portion connecting the second surface and the third surface is discontinuous and angular, for example, the performance of sealing the gap between the first member and the second member is improved. The portion connecting the second surface and the third surface being rounded means that the inner wall surface of the second surface and the inner wall surface of the third surface are connected by a continuous, rounded curved surface.

[0048] In a gasket according to any one of the specific examples (Aspect 7) of Aspects 1 to 6, the portion connecting the first surface and the third surface is rounded. In the above aspects, the portion connecting the first surface and the third surface is rounded. According to the above configuration, when the gasket is sandwiched between two members, the contact area between the gasket and the second member is increased. Therefore, compared to a configuration in which the portion connecting the first surface and the third surface is discontinuously angular, for example, the performance of sealing the gap between the first member and the second member is improved. The portion connecting the first surface and the third surface being rounded means that the inner wall surface of the first surface and the inner wall surface of the third surface are connected by a continuous, rounded curved surface.

[0049] In accordance with an eighth aspect of the present disclosure, the gasket is sandwiched between a first member including a sealing surface on which a mounting groove is formed and a second member facing the sealing surface while being housed in the mounting groove, the gasket comprising an inner circumferential surface, an outer circumferential surface, a first corner located at an end of the connection between the inner circumferential surface and the outer circumferential surface that is closer to the first member, and a second corner located at the connection between the inner circumferential surface and the outer circumferential surface that is opposite the first corner, and when the second corner is pressed in the depth direction of the mounting groove by the second member, the second corner and the outer circumferential surface are displaced outward while the first corner is in contact with the inner wall surface of the mounting groove, so that the outer circumferential surface contacts the outer wall surface of the mounting groove. In this aspect, when the gasket is sandwiched between the two members, it elastically deforms to fill a gap between the inner circumferential surface and the inner wall surface of the mounting groove, and also to fill a gap between the outer circumferential surface and the outer wall surface of the mounting groove. Therefore, the contact area with the first member is increased, the reaction force is reduced, and the performance of sealing the gap between the first member and the second member is improved. Note that the depth direction is a first direction from the second member to the first member along the axis of the height direction of the gasket.

[0050] A sealing structure according to one aspect (Aspect 9) of the present disclosure includes a first member, a second member, and a gasket, wherein the first member includes a sealing surface having a mounting groove formed therein, the second member faces the sealing surface, the gasket is sandwiched between the first member and the second member while housed in the mounting groove, the height dimension of the gasket is greater than the depth dimension of the mounting groove, the gasket has a first surface and a second surface on its outer circumferential surface, and before the gasket is sandwiched between the first member and the second member, the first surface is inclined so as to expand in diameter in the depth direction of the mounting groove, and the second surface is provided in the depth direction of the mounting groove from the first surface and is inclined so as to contract in diameter in the depth direction of the mounting groove. In the above aspect, a gap is provided between the first surface and an outer inner wall surface of the mounting groove, and a gap is also provided between the second surface and a bottom surface of the mounting groove. According to the above configuration, when the gasket is sandwiched between two members, it elastically deforms to fill the gap between the first surface and the outer inner wall surface of the mounting groove, and also to fill the gap between the second surface and the bottom surface of the mounting groove. Therefore, the contact area with the first member is increased, the reaction force is reduced, and the performance of sealing the gap between the first and second members is improved. The depth direction is a first direction extending from the second member to the first member along the height axis of the gasket.

[0051] In a sealing structure according to a specific example (aspect 10) of aspect 9, a gap is provided between the first surface and the outer inner wall surface of the mounting groove, and a gap is provided between the second surface and the bottom surface of the mounting groove. In the above aspect, a gap is provided between the first surface and the outer inner wall surface of the mounting groove, and a gap is also provided between the second surface and the bottom surface of the mounting groove. According to the above configuration, when the gasket is sandwiched between two members, it elastically deforms to fill the gap between the first surface and the outer inner wall surface of the mounting groove, and also to fill the gap between the second surface and the bottom surface of the mounting groove. This increases the contact area with the first member, reduces the reaction force, and improves the ability to seal the gap between the first and second members. The depth direction is a first direction extending from the second member toward the first member along the height axis of the gasket.

[0052] In a sealing structure according to a specific example (Aspect 11) of Aspect 9 or Aspect 10, the gasket includes a third surface on its inner circumferential surface, and a gap is provided between the depthwise end of the third surface and the inner wall surface of the mounting groove. In the above aspect, a gap is formed between the depthwise end of the third surface and the inner wall surface of the mounting groove. With this configuration, when the gasket is sandwiched between two members, it elastically deforms to fill the gap between the depthwise end of the third surface and the inner wall surface of the mounting groove. This improves the ability to seal the gap between the first member and the second member. The depth direction is a first direction extending from the second member to the first member along the heightwise axis of the gasket. [Explanation of symbols]

[0053] 1...first member, 2...second member, 3...gasket, 4...inner space, 5...outer space, 6...inner peripheral surface, 7...outer peripheral surface, 10...sealing surface of first member, 11...mounting groove of first member, 12...bottom surface of mounting groove of first member, 13a...inner wall surface of inner space, 13b...inner wall surface of outer space, 20...sealing surface of second member, 21...mounting groove of second member, 22...bottom surface of mounting groove of second member, 30U...corner portion protruding slightly inward from the Z2 direction, 30 L...corner protruding toward the inner wall surface of the outer space, 30R...corner protruding toward the portion where the inner wall surface of the inner space and the bottom surface are connected, 31...first surface, 32...second surface, 33...third surface, 100...sealing structure, Ha...height dimension of gasket, Hb...depth dimension of mounting groove of first component, Hc...depth dimension of mounting groove of second component, Wa...width dimension of gasket, Wb...width dimension of mounting groove of first component, α...inner angle formed by the first surface and the second surface.

Claims

1. A gasket sandwiched between a first member including a sealing surface in which a mounting groove is formed and a second member facing the sealing surface while being accommodated in the mounting groove, The height dimension of the gasket is greater than the depth dimension of the mounting groove, The outer circumferential surface of the gasket includes a first surface and a second surface, the first surface is inclined so as to increase in diameter in a depth direction of the mounting groove, The second surface is provided in a depth direction of the mounting groove from the first surface and is inclined so as to decrease in diameter in the depth direction of the mounting groove. A gasket characterized by:

2. The width of the gasket is smaller than the width of the mounting groove. The gasket of claim 1.

3. The interior angle between the first surface and the second surface is an obtuse angle. The gasket of claim 1 or 2.

4. the gasket includes a third surface on an inner circumferential surface; The third surface is curved concavely outward. The gasket of claim 1 or 2.

5. The portion where the first surface and the second surface are connected is rounded. The gasket of claim 1 or 2.

6. The portion where the second surface and the third surface are connected is rounded. The gasket of claim 1 or 2.

7. The portion where the first surface and the third surface are connected is rounded. The gasket of claim 1 or 2.

8. A gasket sandwiched between a first member including a sealing surface in which a mounting groove is formed and a second member facing the sealing surface while being accommodated in the mounting groove, an inner circumferential surface and an outer circumferential surface; a first corner portion located at an end portion of the portion where the inner circumferential surface and the outer circumferential surface are connected, the first corner portion being close to the first member; a second corner portion located on the opposite side of the first corner portion in a portion where the inner circumferential surface and the outer circumferential surface are connected, When the second corner portion is pressed in the depth direction of the mounting groove by the second member, In a state where the first corner portion is in contact with an inner wall surface of the mounting groove, The second corner portion and the outer peripheral surface are displaced outward, so that the outer peripheral surface comes into contact with an inner wall surface on the outside of the mounting groove. gasket.

9. The device includes a first member, a second member, and a gasket, the first member includes a sealing surface having a mounting groove formed therein; the second member faces the sealing surface, the gasket is sandwiched between the first member and the second member while being housed in the mounting groove, The height dimension of the gasket is greater than the depth dimension of the mounting groove, The gasket has a first surface and a second surface on its outer periphery, In a state before the gasket is sandwiched between the first member and the second member, the first surface is inclined so as to increase in diameter in a depth direction of the mounting groove, The second surface is provided in a depth direction of the mounting groove from the first surface and is inclined so as to decrease in diameter in the depth direction of the mounting groove. Sealed structure.

10. a gap is provided between the first surface and an outer inner wall surface of the mounting groove; A gap is provided between the second surface and the bottom surface of the mounting groove. The sealing structure of claim 9.

11. the gasket includes a third surface on an inner circumferential surface; A gap is provided between the end of the third surface in the depth direction and the inner wall surface of the mounting groove. The sealing structure according to claim 9 or 10.

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