JP2017172756A - Seal structure and gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure and a gasket in which a stable sealing performance can be realized even if a fluid pressure of fluid to be sealed becomes high when a gasket is installed in an annular groove in which a groove width becomes narrow as it faces toward a groove bottom part.SOLUTION: Each of a pair of side surfaces 111, 112 at a gasket 100 is provided with a slant surface in such a way that a distance between these pair of side surfaces may become narrow as it faces toward the groove bottom of an annular groove 210 and the opposing surfaces opposing against the groove bottom are provided with an annular pressure receiving groove 120 for receiving a fluid pressure of fluid to be sealed, a side surface 112 of a sealing region [A] of the pair of side surfaces 111, 112 is formed with a feeding groove 130 for guiding the fluid to be sealed to the pressure receiving groove 120 and at the same time it is closely contacted with a groove side surface 211 of an opposite side [B] at the annular groove 210 and an end surface of the second member 300 to seal a clearance between a first member 200 and a second member 300.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a sealing structure and a gasket for sealing a gap between two members.

  Conventionally, a gasket that is mounted in an annular groove provided in one of two members fixed to each other and seals a gap between the two members is known. Further, for reasons such as a manufacturing method, the groove width of the annular groove on which the gasket is mounted may be configured to become narrower toward the groove bottom. In such a case, in order to stabilize the mounting state of the gasket, a technique is known in which an annular recess is provided on the facing surface side facing the groove bottom in the gasket (see Patent Document 1). A sealing structure and a gasket according to such a conventional example will be described with reference to FIGS. 12 and 13 are schematic cross-sectional views of a sealing structure according to a conventional example. FIG. 12 shows a state where fluid pressure is not acting on the gasket, and FIG. 13 shows a state where fluid pressure is acting on the gasket.

  The gasket 400 is used to seal a gap between two members fixed to each other. For convenience of explanation, one of the two members is referred to as a first member 200, and the other member is referred to as a second member 300. The first member 200 is provided with an annular groove 250. The gasket 400 is attached to the annular groove 250, and the gasket 400 is in close contact with each of the first member 200 and the second member 300, whereby the gap between the first member 200 and the second member 300 is sealed. .

  The annular groove 250 according to the conventional example is configured such that the groove width becomes narrower toward the groove bottom. An annular recess 410 is provided on the opposite surface side of the gasket 400 that faces the groove bottom. The gasket 400 is stably attached to the annular groove 250 by the sealing structure configured as described above. In FIG. 12, a dotted line indicates a state where the gasket 400 is not subjected to an external force.

  However, in the environment where the fluid pressure of the fluid to be sealed is high, there are concerns about the following points. 12 and 13, (A) shows the region side where the fluid to be sealed is sealed, and (B) shows the side opposite to the region where the fluid to be sealed is sealed. When the fluid pressure of the fluid to be sealed increases, the gasket 400 is pressed against the (B) side of the annular groove 250 in the drawing. Here, since the annular recess 410 is provided in the gasket 400, the rigidity on the side where the recess 410 is provided is lower than the rigidity on the surface side in close contact with the second member 300. Accordingly, a force that compresses the gasket 400 toward the groove bottom side of the annular groove 250 acts on the gasket 400 by the fluid pressure. Thereby, in an environment where the fluid pressure is high, there is a concern that the surface pressure of the gasket 400 with respect to the second member 300 is lowered and the sealing performance is lowered.

JP 2009-30773 A

  An object of the present invention is to provide a sealing structure capable of exhibiting stable sealing performance even when the fluid pressure of a fluid to be sealed is increased, when a gasket is attached to an annular groove whose groove width becomes narrower toward the groove bottom, and Provide gaskets.

  The present invention employs the following means in order to solve the above problems.

That is, the sealing structure of the present invention is
Two members fixed to each other;
A gasket that is mounted in an annular groove provided in one of these two members and seals a gap between the two members;
In a sealing structure comprising:
The pair of groove side surfaces in the annular groove are each provided with an inclined surface so that the groove width becomes narrower toward the groove bottom,
A pair of side surfaces in the gasket is provided with inclined surfaces so that the distance between the pair of side surfaces becomes narrower toward the groove bottom,
An annular pressure receiving groove that receives the fluid pressure of the fluid to be sealed is provided on the opposite surface side of the gasket that faces the groove bottom,
An introduction groove that guides the fluid to be sealed to the pressure receiving groove is formed on a side surface of the region where the fluid to be sealed is sealed among the pair of side surfaces,
The gasket is in close contact with the groove wall surface on the opposite side to the region where the fluid to be sealed in the annular groove is sealed, and the end surface of the other member of the two members. Is sealed.

The gasket of the present invention is
An annular groove provided in one of the two members fixed to each other, and a pair of groove side surfaces of the annular groove has inclined surfaces so that the groove width becomes narrower toward the groove bottom. In the gasket that is mounted in the annular groove provided and seals the gap between the two members,
The pair of side surfaces are respectively provided with inclined surfaces so that the distance between the pair of side surfaces becomes narrower toward the groove bottom,
On the opposite surface side facing the groove bottom, an annular pressure receiving groove for receiving the fluid pressure of the fluid to be sealed is provided,
An introduction groove that guides the fluid to be sealed to the pressure receiving groove is formed on a side surface of the region where the fluid to be sealed is sealed among the pair of side surfaces,
The gap between the two members is sealed by closely contacting the groove side surface of the annular groove opposite to the region where the fluid to be sealed is sealed and the end surface of the other member of the two members. It is characterized by that.

  According to the present invention, the fluid to be sealed is guided from the introduction groove to the pressure receiving groove. Thereby, as the fluid pressure of the fluid to be sealed increases, the gasket is against the groove side surface of the annular groove opposite to the region where the fluid to be sealed is sealed and the end surface of the other member of the two members. Are pressed against each other. Thus, the gasket exhibits a self-sealing function by the fluid pressure. Therefore, stable sealing performance is exhibited even when the fluid pressure of the fluid to be sealed increases.

Here, the first protrusion on the side of the gasket in which the fluid to be sealed is sealed through the pressure receiving groove is the first protrusion on the side opposite to the region in which the fluid to be sealed is sealed through the pressure receiving groove. 2 The protruding amount is larger than the protruding part,
In a state where the fluid pressure of the fluid to be sealed is not acting on the gasket, the first protrusion may be in contact with the groove bottom, and the second protrusion may not be in contact with the groove bottom.

Thus, even when the fluid pressure is not acting on the gasket, since the first protrusion on the region side where the fluid to be sealed is sealed is in contact with the groove bottom of the annular groove, In addition, the gasket is suppressed from being compressed toward the groove bottom side.

  In addition, it is suitable that the site | part which a 1st protrusion part contacts is comprised by the plane among the groove bottoms of an annular groove.

  Thereby, when fluid pressure acts, it can suppress more effectively that a gasket will be compressed toward the groove bottom side.

  As described above, according to the present invention, when a gasket is attached to an annular groove whose groove width becomes narrower toward the groove bottom, stable sealing performance is exhibited even when the fluid pressure of the fluid to be sealed increases. Can be made.

FIG. 1 is a plan view of a gasket according to Embodiment 1 of the present invention. FIG. 2 is a part of a back view of the gasket according to the first embodiment of the present invention. FIG. 3 is a plan view of one of the two members according to the first embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of the sealing structure according to the first embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of the sealing structure according to the first embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of a sealing structure according to Embodiment 2 of the present invention. FIG. 7 is a schematic cross-sectional view of a sealing structure according to Embodiment 2 of the present invention. FIG. 8 is a schematic cross-sectional view of a sealing structure according to Embodiment 3 of the present invention. FIG. 9 is a schematic cross-sectional view of a sealing structure according to Embodiment 3 of the present invention. FIG. 10 is a schematic cross-sectional view of a sealing structure according to Example 4 of the present invention. FIG. 11 is a schematic cross-sectional view of a sealing structure according to Embodiment 4 of the present invention. FIG. 12 is a schematic cross-sectional view of a sealing structure according to a conventional example. FIG. 13 is a schematic cross-sectional view of a conventional sealing structure.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

Example 1
With reference to FIGS. 1-5, the sealing structure and gasket which concern on Example 1 of this invention are demonstrated. FIG. 1 is a plan view of a gasket according to Embodiment 1 of the present invention. FIG. 2 is a part of a back view of the gasket according to the first embodiment of the present invention. 2 is a view of the portion of the circle O in FIG. 1 as viewed from the back side. FIG. 3 is a plan view of one of the two members according to the first embodiment of the present invention. 4 and 5 are schematic cross-sectional views of the sealing structure according to Embodiment 1 of the present invention. 4 and 5 corresponds to the AA cross-sectional view in FIG. 1, and one member in FIGS. 4 and 5 corresponds to the BB cross-sectional view in FIG. 4 shows a state where fluid pressure is not acting on the gasket, and FIG. 5 shows a state where fluid pressure is acting on the gasket. 4 and 5, (A) shows the region side where the fluid to be sealed is sealed, and (B) shows the side opposite to the region where the fluid to be sealed is sealed. Hereinafter, for convenience of explanation, they are referred to as a sealed region side (A) and an opposite side (B).

<Sealing structure>
The sealing structure according to the present embodiment includes two members that are fixed to each other and a gasket 100 made of a rubber-like elastic body that seals a gap between the two members. Hereinafter, for convenience of explanation, one of the two members is referred to as a first member 200, and the other member is referred to as a second member 300. The first member 200 is provided with an annular groove 210. The gasket 100 is attached to the annular groove 210, and the gasket 100 is in close contact with each of the first member 200 and the second member 300, whereby the gap between the first member 200 and the second member 300 is sealed. .

  The pair of groove side surfaces 211 and 212 in the annular groove 210 are provided with inclined surfaces so that the groove width becomes narrower toward the groove bottom. In the annular groove 210 according to the present embodiment, most of the groove side surfaces 211 and 212 are configured as flat inclined surfaces, and the groove bottom surface is configured as a curved surface.

<Gasket>
The gasket 100 will be described in more detail. The planar shape of the gasket 100 is designed to be similar to the annular groove 210 provided in the first member 200. The pair of side surfaces 111 and 112 in the gasket 100 are provided with inclined surfaces so that the distance between the pair of side surfaces 111 and 112 becomes narrower toward the groove bottom of the annular groove 210. In the gasket 100 according to the present embodiment, most of the pair of side surfaces 111 and 112 are constituted by flat inclined surfaces. Further, the inclination angles of the pair of side surfaces 111 and 112 are designed to be the same as the inclination angles of the inclined surfaces of the pair of groove side surfaces 211 and 212 in the annular groove 210.

  An annular pressure receiving groove 120 that receives the fluid pressure of the fluid to be sealed is provided on the opposite surface side of the gasket 100 that faces the groove bottom (the groove bottom of the annular groove 210). The pressure receiving groove 120 is provided at the center in the width direction of the gasket 100 along the entire direction along the direction in which the gasket 100 extends.

  In addition, an introduction groove 130 that guides the fluid to be sealed to the pressure receiving groove 120 is formed on the side surface 112 on the sealing region side (A) of the pair of side surfaces 111 and 112 in the gasket 100. In the gasket 100, the introduction groove 130 is provided from the end portion on the side closely contacting the end surface of the second member 300 to the end portion on the groove bottom side of the annular groove 210. That is, in FIGS. 4 and 5, the introduction groove 130 is provided from one end in the height direction of the gasket 100 to the other end. The introduction grooves 130 are provided at a plurality of locations. What is necessary is just to set suitably the arrangement | positioning number and arrangement position of the introduction groove | channel 130 according to the shape and magnitude | size of the gasket 100. FIG.

<Sealing mechanism>
In particular, the sealing mechanism of the sealing structure according to the present embodiment will be described with reference to FIGS. 4 and 5. In the sealing structure according to the present embodiment, the fluid to be sealed on the sealing region side (A) is guided from the introduction groove 130 in the gasket 100 into the annular groove 210 and is guided to the pressure receiving groove 120 of the gasket 100 (FIG. 4 (see arrow X). Therefore, when the fluid pressure on the sealed region side (A) increases, the fluid pressure P acts on the inner wall surface of the pressure receiving groove 120 in the gasket 100 (see FIG. 5). As a result, the gasket 100 is in close contact with the opposite (B) groove wall surface of the annular groove 210 and the end surface of the second member 300, and the gap between the first member 200 and the second member 300 is sealed. The

<Excellent points of sealing structure and gasket according to this example>
According to the sealing structure and the gasket 100 according to the present embodiment, the fluid to be sealed is guided from the introduction groove 130 in the gasket 100 to the pressure receiving groove 120. Thereby, as the fluid pressure of the fluid to be sealed increases, the gasket 100 is against the groove side surface 211 on the opposite side (B) of the annular groove 210 provided in the first member 200 and the end surface of the second member 300. , Respectively. Thus, the gasket 100 exhibits a self-sealing function by the fluid pressure. Therefore, stable sealing performance is exhibited even when the fluid pressure of the fluid to be sealed increases.

(Example 2)
6 and 7 show the second embodiment of the present invention. Since the basic configuration and operation are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted. 6 and 7 are schematic cross-sectional views of a sealing structure according to Embodiment 2 of the present invention. 6 and 7 corresponds to the AA cross-sectional view in FIG. 1, and one member (first member) in FIGS. 6 and 7 corresponds to the BB cross-sectional view in FIG. 6 shows a state where fluid pressure is not acting on the gasket, and FIG. 7 shows a state where fluid pressure is acting on the gasket.

  Since the configuration of the entire sealing structure is the same as that of the first embodiment, description thereof will be omitted as appropriate. Also in the present embodiment, the pair of groove side surfaces 221 and 222 of the annular groove 220 provided in the first member 200 are provided with inclined surfaces so that the groove width becomes narrower toward the groove bottom. And most of the groove side surfaces 221 and 222 in the annular groove 220 are formed by flat inclined surfaces, but the groove bottom surface 223 is formed by a plane unlike the case of the first embodiment.

  Also in the rubber-like elastic gasket 100 a according to the present embodiment, the planar shape is designed to be similar to the annular groove 220 provided in the first member 200. The pair of side surfaces 111 a and 112 a in the gasket 100 a are provided with inclined surfaces so that the distance between the pair of side surfaces 111 a and 112 a becomes narrower toward the groove bottom of the annular groove 220. Also in the gasket 100a according to the present embodiment, most of the pair of side surfaces 111a and 112a are constituted by flat inclined surfaces. In addition, the inclination angles of the pair of side surfaces 111 a and 112 a are designed to be the same as the inclination angles of the inclined surfaces of the pair of groove side surfaces 221 and 222 in the annular groove 220.

  An annular pressure receiving groove 120a that receives the fluid pressure of the fluid to be sealed is provided on the opposite surface side of the gasket 100a that faces the groove bottom (the groove bottom of the annular groove 220). The pressure receiving groove 120a is provided over the entire circumference along the direction in which the gasket 100a extends in the center in the width direction of the gasket 100a.

  In addition, an introduction groove 130a that guides the fluid to be sealed to the pressure receiving groove 120a is formed on the side surface 112a on the sealing region side (A) of the pair of side surfaces 111a and 112a in the gasket 100a. The introduction groove 130 a is provided from the end portion on the gasket 100 a that is in close contact with the end surface of the second member 300 to the end portion on the groove bottom side of the annular groove 220. That is, in FIGS. 6 and 7, the introduction groove 130a is provided from one end in the height direction of the gasket 100a to the other end. The introduction grooves 130a are provided at a plurality of locations. What is necessary is just to set suitably about the arrangement number and arrangement position of the introduction groove 130a according to the shape and size of the gasket 100a.

  And in the gasket 100a which concerns on a present Example, the 1st protrusion part 100aX of the sealing area side (A) via the pressure receiving groove 120a is more than the 2nd protrusion part 100aY of the other side (B) via the pressure receiving groove 120a. Is also designed to increase the amount of protrusion. In the state where the fluid pressure of the fluid to be sealed is not acting on the gasket 100a, the first protrusion 100aX is in contact with the groove bottom surface 223 of the annular groove 220, and the second protrusion 100aY is in contact with the groove bottom surface 223. (See FIG. 6). Needless to say, the first protrusion 100aX and the second protrusion 100aY are both provided in a ring shape.

  Since the sealing mechanism is as described in the first embodiment, the description thereof is omitted.

  Also in the sealing structure and gasket 100a according to the present embodiment configured as described above, the self-sealing function is exhibited by the fluid pressure as in the case of the first embodiment. Therefore, stable sealing performance is exhibited even when the fluid pressure of the fluid to be sealed increases. In the case of the present embodiment, the first protrusion 100aX on the sealing region side (A) is in contact with the groove bottom surface 223 of the annular groove 220 even when the fluid pressure is not acting on the gasket 100a. When the fluid pressure is applied, the gasket 100a is suppressed from being compressed toward the groove bottom side. Moreover, since the site | part which the 1st protrusion part 100aX contacts is comprised by the plane among the groove bottoms of the annular groove 220, when fluid pressure acts, the gasket 100a will be compressed toward the groove bottom side. , Can be more effectively suppressed.

(Example 3)
8 and 9 show a third embodiment of the present invention. Since the basic configuration and operation are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted. 8 and 9 are schematic cross-sectional views of a sealing structure according to Embodiment 3 of the present invention. 8 and 9 corresponds to the AA sectional view in FIG. 1, and one member (first member) in FIGS. 8 and 9 corresponds to the BB sectional view in FIG. Further, FIG. 8 shows a state where fluid pressure is not acting on the gasket, and FIG. 9 shows a state where fluid pressure is acting on the gasket.

  Since the configuration of the entire sealing structure is the same as that of the first embodiment, description thereof will be omitted as appropriate. Also in the present embodiment, the pair of groove side surfaces 231 and 232 of the annular groove 230 provided in the first member 200 are provided with inclined surfaces so that the groove width becomes narrower toward the groove bottom. In the present embodiment, the inclination angles of these inclined surfaces are configured to be larger than those in the first embodiment.

  Also in the rubber-like elastic gasket 100b according to the present embodiment, the planar shape is designed to be similar to the annular groove 230 provided in the first member 200. The pair of side surfaces 111b and 112b in the gasket 100b are provided with inclined surfaces so that the distance between the pair of side surfaces 111b and 112b becomes narrower toward the groove bottom of the annular groove 230. Also in the gasket 100b according to the present embodiment, most of the pair of side surfaces 111b and 112b are constituted by flat inclined surfaces. In addition, the inclination angles of the pair of side surfaces 111 b and 112 b are designed to be the same as the inclination angles of the inclined surfaces of the pair of groove side surfaces 231 and 232 in the annular groove 230. Therefore, the inclination angle of the pair of side surfaces 111b and 112b in the gasket 100b according to the present embodiment is larger than that in the first embodiment.

  An annular pressure receiving groove 120b that receives the fluid pressure of the fluid to be sealed is provided on the opposite surface side of the gasket 100b that faces the groove bottom (the groove bottom of the annular groove 230). The pressure receiving groove 120b is provided at the center in the width direction of the gasket 100b along the whole direction along the direction in which the gasket 100b extends.

In addition, an introduction groove 130b that guides the fluid to be sealed to the pressure receiving groove 120b is formed on the side surface 112b on the sealing region side (A) of the pair of side surfaces 111b and 112b in the gasket 100b. The introduction groove 130b is provided in the gasket 100b from the end on the side closely contacting the end surface of the second member 300 to the end on the groove bottom side of the annular groove 230. That is, in FIGS. 8 and 9, the introduction groove 130b is provided from one end in the height direction of the gasket 100b to the other end. The introduction grooves 130b are provided at a plurality of locations. What is necessary is just to set suitably the arrangement | positioning number and arrangement | positioning position of the introduction groove | channel 130b according to the shape and magnitude | size of the gasket 100b.

  Since the sealing mechanism is as described in the first embodiment, the description thereof is omitted.

  Also in the sealing structure and gasket 100b according to the present embodiment configured as described above, the self-sealing function is exhibited by the fluid pressure as in the case of the first embodiment. Therefore, stable sealing performance is exhibited even when the fluid pressure of the fluid to be sealed increases. In the case of the present embodiment, the inclination angle of the inclined surfaces of the pair of groove side surfaces 231 and 232 in the annular groove 230 and the inclination angle of the pair of side surfaces 111b and 112b in the gasket 100b are the same as in the case of the first embodiment. It is designed to be larger than that. Therefore, the compression of the gasket 100b toward the groove bottom when the fluid pressure is applied is further suppressed than in the case of the first embodiment.

Example 4
10 and 11 show Embodiment 4 of the present invention. Since the basic configuration and operation are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted. 10 and 11 are schematic cross-sectional views of a sealing structure according to Embodiment 4 of the present invention. 10 and 11 corresponds to the AA sectional view in FIG. 1, and one member (first member) in FIGS. 10 and 11 corresponds to the BB sectional view in FIG. FIG. 10 shows a state where fluid pressure is not acting on the gasket, and FIG. 11 shows a state where fluid pressure is acting on the gasket.

  Since the configuration of the entire sealing structure is the same as that of the first embodiment, description thereof will be omitted as appropriate. Also in this embodiment, the pair of groove side surfaces 241 and 242 of the annular groove 240 provided in the first member 200 are provided with inclined surfaces so that the groove width becomes narrower toward the groove bottom. In the present embodiment, the inclination angles of these inclined surfaces are configured to be larger than those in the first embodiment.

  Also in the rubber-like elastic gasket 100c according to the present embodiment, the planar shape is designed to be similar to the annular groove 240 provided in the first member 200. The pair of side surfaces 111c and 112c in the gasket 100c are provided with inclined surfaces so that the distance between the pair of side surfaces 111c and 112c becomes narrower toward the groove bottom of the annular groove 240. In the case of the present embodiment, the groove bottom side of the annular groove 240 of the pair of side surfaces 111c and 112c is configured as an inclined surface, and the side closely contacting the end surface of the second member 300 includes the side surface 111c and the side surface 112c. It is comprised so that it may become parallel. Further, also in the gasket 100c according to the present embodiment, most of the portion constituted by the inclined surfaces of the pair of side surfaces 111c and 112c is constituted by a flat inclined surface. In addition, the inclination angles of the inclined surfaces of the pair of side surfaces 111 c and 112 c are designed to be the same as the inclination angles of the inclined surfaces of the pair of groove side surfaces 241 and 242 in the annular groove 240. Therefore, the inclination angle of the inclined surface of the pair of side surfaces 111c and 112c in the gasket 100c according to the present embodiment is larger than that in the first embodiment.

  An annular pressure receiving groove 120c that receives the fluid pressure of the fluid to be sealed is provided on the opposite surface side of the gasket 100c that faces the groove bottom (the groove bottom of the annular groove 240). The pressure receiving groove 120c is provided at the center in the width direction of the gasket 100c over the entire circumference along the direction in which the gasket 100c extends.

Further, the sealing region side of the pair of side surfaces 111c and 112c in the gasket 100c (
An introduction groove 130c that guides the fluid to be sealed to the pressure receiving groove 120c is formed on the side surface 112c of A). The introduction groove 130 c is provided in the gasket 100 c from an end portion on the side in close contact with the end surface of the second member 300 to an end portion on the groove bottom side of the annular groove 240. That is, in FIG. 10 and FIG. 11, the introduction groove 130c is provided from one end in the height direction of the gasket 100c to the other end. The introduction grooves 130c are provided at a plurality of locations. What is necessary is just to set suitably the arrangement | positioning number and arrangement position of the introduction groove | channel 130c according to the shape and magnitude | size of the gasket 100c.

  Since the sealing mechanism is as described in the first embodiment, the description thereof is omitted.

  Also in the sealing structure and gasket 100b according to the present embodiment configured as described above, the self-sealing function is exhibited by the fluid pressure as in the case of the first embodiment. Therefore, stable sealing performance is exhibited even when the fluid pressure of the fluid to be sealed increases. In the case of this embodiment, the inclination angle of the inclined surfaces of the pair of groove side surfaces 241 and 242 in the annular groove 240 and the inclination angle of the inclined surface of the pair of side surfaces 111c and 112c in the gasket 100c are as described above. It is designed to be larger than in the case of Example 1. Therefore, the compression of the gasket 100c toward the groove bottom when the fluid pressure is applied is further suppressed than in the case of the first embodiment.

100, 100a, 100b, 100c Gasket 100aX First protrusion 100aY Second protrusion 111, 111a, 111b, 111c Side surface 112, 112a, 112b, 112c Side surface 120, 120a, 120b, 120c Pressure receiving groove 130, 130a, 130b, 130c Introduction groove 200 First member 210, 220, 230, 240 Annular groove 211, 212, 221, 222, 231, 232, 241, 242 Groove side surface 223 Groove bottom surface 300 Second member

Claims (5)

Two members fixed to each other;
A gasket that is mounted in an annular groove provided in one of these two members and seals a gap between the two members;
In a sealing structure comprising:
The pair of groove side surfaces in the annular groove are each provided with an inclined surface so that the groove width becomes narrower toward the groove bottom,
A pair of side surfaces in the gasket is provided with inclined surfaces so that the distance between the pair of side surfaces becomes narrower toward the groove bottom,
An annular pressure receiving groove that receives the fluid pressure of the fluid to be sealed is provided on the opposite surface side of the gasket that faces the groove bottom,
An introduction groove that guides the fluid to be sealed to the pressure receiving groove is formed on a side surface of the region where the fluid to be sealed is sealed among the pair of side surfaces,
The gasket is in close contact with the groove wall surface on the opposite side to the region where the fluid to be sealed in the annular groove is sealed, and the end surface of the other member of the two members. Is sealed. The first protrusion on the side of the gasket where the fluid to be sealed is sealed via the pressure receiving groove is the second protrusion on the side opposite to the region where the fluid to be sealed is sealed via the pressure receiving groove. The protruding amount is larger than
The first protrusion is in contact with the groove bottom and the second protrusion is not in contact with the groove bottom in a state where the fluid pressure of the fluid to be sealed is not acting on the gasket. Item 2. The sealing structure according to Item 1.   The sealing structure according to claim 2, wherein a portion of the groove bottom of the annular groove that is in contact with the first protrusion is configured by a flat surface. An annular groove provided in one of the two members fixed to each other, and a pair of groove side surfaces of the annular groove has inclined surfaces so that the groove width becomes narrower toward the groove bottom. In the gasket that is mounted in the annular groove provided and seals the gap between the two members,
The pair of side surfaces are respectively provided with inclined surfaces so that the distance between the pair of side surfaces becomes narrower toward the groove bottom,
On the opposite surface side facing the groove bottom, an annular pressure receiving groove for receiving the fluid pressure of the fluid to be sealed is provided,
An introduction groove that guides the fluid to be sealed to the pressure receiving groove is formed on a side surface of the region where the fluid to be sealed is sealed among the pair of side surfaces,
The gap between the two members is sealed by closely contacting the groove side surface of the annular groove opposite to the region where the fluid to be sealed is sealed and the end surface of the other member of the two members. A gasket characterized by that. The first protrusion on the region side where the fluid to be sealed is sealed through the pressure receiving groove protrudes from the second protrusion on the opposite side to the region where the fluid to be sealed is sealed through the pressure receiving groove. Large quantity,
The state in which the fluid pressure of the fluid to be sealed is not applied, the first protrusion is in contact with the groove bottom, and the second protrusion is not in contact with the groove bottom. The gasket described.