JP2006200649A - Sealing structure and mounting groove for gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing structure and a mounting groove for a gasket capable of preventing the gasket from falling down even if the gasket has a vertically long cross section shape and suppressing reduction of sealing performance due to falling-down of the gasket. <P>SOLUTION: In this sealing structure for sealing a clearance between two members by the gasket 30 having a pair of sealing faces 31, 32 having a curved shape, the gasket 30 is provided with a main body part in which distance between tips of the sealing faces 31, 32 is longer than thickness in the direction of width in a non-compressed condition, the member 10 on one side among two members is provided with the mounting groove 11 in which the gasket 30 is mounted, and inclined faces on which depth of the groove is gradually reduced from a part in the vicinity of center of groove width toward both side faces of the mounting groove 11 are provided on both sides across the part in the vicinity of center of groove width on a groove bottom 12 of the mounting groove 11, respectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sealing structure for sealing a gap between two members with a gasket and a mounting groove for a gasket on which the gasket is mounted.

  In recent years, for the purpose of weight reduction and space saving, a resin material is often used as a material for parts constituting various apparatuses, and the parts tend to be miniaturized. The same applies to the parts to which the gasket is attached.

  In general, a resin material has a larger dimensional tolerance than a material such as metal. Further, along with the miniaturization of parts, the groove width of the mounting groove for mounting the gasket must be reduced. For these reasons, a gasket having a circular cross-section may not be able to achieve a crushing rate or a filling rate that satisfies the sealing performance. As a countermeasure in such a case, a gasket having a vertically long cross-sectional shape (a gasket in which the distance between the tips of the sealing surfaces is longer than the thickness in the width direction) is used.

  In such a gasket, from the viewpoint of sealing performance, it is one of important issues to prevent the gasket from falling in the mounting groove. This is because the gasket has a lateral width that is narrower than the groove width of the mounting groove from the viewpoint of mounting properties, and the gasket has a vertically long cross-sectional shape as described above. This is because it inherently has.

  As a countermeasure against the collapse of the gasket, it is known that a plurality of a pair of protrusions that are in contact with both side surfaces of the mounting groove are partially provided in the longitudinal direction of the gasket on both sides in the width direction of the gasket body. Yes. However, as the gaskets become smaller, it has become difficult to cope with the protrusions as described above. This point will be described with reference to FIG.

  FIG. 6 is a diagram for explaining the problems of the sealing structure according to the conventional example. FIG. 6 is a schematic cross-sectional view showing how the gasket is assembled. The illustrated sealing structure is a structure in which a gap between two members (one member 100 and the other member 200) that are assembled together by means of a gasket 30 is sealed by a gasket 30. One member 100 is provided with a mounting groove 101 having a substantially square cross section. The gasket 30 is mounted in the mounting groove 101.

  The gasket 30 includes a main body 30a and a pair of protrusions 33 and 34 that protrude from the main body 30a on both sides in the width direction. Note that a plurality of pairs of the protruding portions 33 and 34 are partially provided in the longitudinal direction of the gasket 30. The main body 30a has a pair of curved sealing surfaces 31, 32. And the main-body part 30a is a shape whose cross section is vertically long (The shape where the distance of the front-end | tip of the sealing surfaces 31 and 32 is longer than the thickness of the width direction in the state which is not compressed).

  The reason why the cross section of the main body 30a is a vertically long shape is to achieve a crushing rate and a filling rate that satisfy the sealing performance even in a small size. Further, in order to improve the mounting property of the gasket 30 to the mounting groove 101, the lateral width of the main body portion 30 a is configured to be narrower than the lateral width of the mounting groove 101. For these reasons, only the main body 30a of the gasket 30 easily falls down in the mounting groove 101, and it is difficult to satisfy sufficient sealing performance. Therefore, as described above, the pair of projecting portions 33 and 34 are provided, and these are brought into contact with both side surfaces of the mounting groove 101 to prevent the gasket 30 from falling.

  As shown in FIG. 6A, after the gasket 30 is mounted in the mounting groove 101, the gasket 30 is compressed by the assembly of the one member 100 and the other member 200. In addition, the arrow in FIG. 6 (A) has shown the direction of the force which the gasket 30 receives from both. As shown in FIG. 6 (A), when the direction of these forces deviates from the center of the gasket 30, the gasket 30 falls down. However, the protrusions 33 and 34 are in contact with both side surfaces of the mounting groove 101 at the portions surrounded by circles in the drawing, and prevent the gasket 30 from falling. Thus, if these functions are exhibited by providing the protrusions 33 and 34, the gasket 30 can be prevented from falling.

  However, as the size of the gasket 30 is further reduced, the protrusions 33 and 34 must be made smaller, and the rigidity of the protrusions 33 and 34 is lowered accordingly. Therefore, the protrusions 33 and 34 may not support the gasket 30 and the gasket 30 may fall down. In FIG. 6B, the gasket 30X indicated by a dotted line shows a state standing upright, and the gasket 30Y indicated by a solid line shows a collapsed state. As can be seen from the figure, the gasket 30 having a vertically long cross-sectional shape falls while the seal surface 32 slides on the groove bottom 102. Since the groove bottom 102 of the mounting groove 101 according to the conventional example is configured with a surface such that the depth of the groove is constant, the case where the gasket 30 is tilted compared to the case where the gasket 30 stands straight, The crushing cost (the amount to be compressed) of the gasket 30 becomes small. That is, as shown in FIG. 6 (B), the amount of protrusion of the gasket 30 from the opening end face of the mounting groove 101 before the gasket 30 is compressed is the case where the gasket 30 stands upright (gasket). 30X) is P, whereas Q is when the gasket 30 is in a collapsed state (gasket 30Y). Thus, in the latter case, the crushing margin is reduced by (PQ). As described above, if the gasket 30 falls within the mounting groove 101, the crushing margin becomes smaller than intended, and a sufficient surface pressure cannot be obtained, resulting in a decrease in sealing performance.

In addition, in order to prevent the gasket from collapsing, some of the gaskets have a devised sectional shape, such as the gasket 300 shown in FIG. 7 and the gasket 400 shown in FIG. However, when a shape that does not have objectivity on both the front and back sides, such as these gaskets 300 and 400, is employed, the front and back sides must be confirmed when the gaskets 300 and 400 are mounted in the mounting grooves. For this reason, when the gaskets 300 and 400 are small, it is difficult to discriminate between the front and the back, so that the mounting property is deteriorated or erroneous mounting occurs. Therefore, it is not always the best policy, especially when the gasket is small.
Japanese Utility Model Publication No. 6-65662 JP-A-8-303599

  As described above, the vertically long gasket having a cross-sectional shape has a property of easily falling down in the mounting groove. And that is a factor that reduces the sealing performance.

  An object of the present invention is to provide a sealing structure and a gasket mounting groove that can suppress the collapse of the gasket even if the gasket has a vertically long cross-sectional shape.

  Another object of the present invention is to provide a sealing structure and a gasket mounting groove that can suppress a deterioration in sealing performance caused by the fall of the gasket in a gasket having a vertically long cross-sectional shape.

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

That is, the sealing structure of the present invention is
In a sealing structure for sealing a gap between two members by a gasket having a pair of curved sealing surfaces,
The gasket includes a main body portion in which the distance between the tips of the sealing surfaces is longer than the thickness in the width direction in an uncompressed state,
One member of the two members is provided with a mounting groove for mounting the gasket,
On the groove bottom of the mounting groove, inclined surfaces that gradually decrease the depth of the groove from the vicinity of the center of the groove width toward the both side surfaces of the mounting groove are provided on both sides across the vicinity of the center of the groove width. It is characterized by being.

  According to the present invention, when the gasket is compressed by the two members, if a force acts in the direction in which the gasket is tilted, the contact position of the gasket seal surface with the groove bottom of the mounting groove deviates from the vicinity of the center of the groove width. . Accordingly, a component force is generated from the inclined surface provided at the groove bottom of the mounting groove to the center of the groove width, that is, the direction in which the gasket is raised, with respect to the seal surface on the groove bottom side of the gasket. Moreover, since the inclined surface provided in the groove bottom is inclined so as to reduce the depth of the groove toward the side surface of the mounting groove, the distance between the other member surface of the two members and the groove bottom is It becomes narrower toward the side of the mounting groove. Therefore, it is possible to suppress the seal surface on the groove bottom side of the gasket from sliding on the groove bottom of the mounting groove toward the side surface of the mounting groove. Accordingly, when the gasket falls, the seal surface on the groove bottom side of the gasket slides on the groove bottom of the mounting groove toward the side surface of the mounting groove, but this sliding is suppressed. From the above, the fall of the gasket can be suppressed. In addition, even if the gasket falls down to some extent, as described above, the gap between the other member surface and the groove bottom becomes narrower toward the side of the mounting groove. can do.

In addition, the cross section of the gasket is symmetrical with respect to the center line connecting the tips of the pair of sealing surfaces,
The mounting groove is configured such that the center of the groove width is deepest, and the groove bottom is provided with curved surfaces that are curved on both sides with respect to the center of the groove width. Good.

  If it does in this way, regardless of the direction in which a gasket falls, the fall of a gasket can be controlled and the fall of the crushing cost (the amount compressed) of a gasket can be controlled.

In addition, the groove width of the mounting groove is configured wider than the lateral width of the main body of the gasket,
The gasket is provided with a plurality of pairs of protrusions that partially protrude from the main body on both sides in the width direction and are in contact with both side surfaces of the mounting groove in the longitudinal direction of the gasket. Good.

  In this way, since the groove width of the mounting groove is wider than the lateral width of the main body of the gasket, the gasket can be easily mounted on the mounting groove. Moreover, the fall of the gasket is suppressed to some extent by the protruding portion.

  The cross section of the gasket may be symmetric with respect to the center line between the pair of sealing surfaces.

In this way, the gasket can be mounted in the mounting groove regardless of the orientation of the front and back, even when the gasket has the same shape, such as a circular, elliptical, or regular polygonal plan shape. Therefore, it is not necessary to check the front and back of the gasket when mounting the gasket in the mounting groove.

The gasket mounting groove of the present invention is
In a gasket mounting groove in which a gasket having a pair of curved sealing surfaces and a gasket having a main body portion in which the distance between the tips of the sealing surfaces is longer than the thickness in the width direction in an uncompressed state is mounted ,
On the groove bottom to which one of the sealing surfaces of the gasket is closely attached, an inclined surface that gradually decreases the depth of the groove from the vicinity of the center of the groove width toward the both side surfaces of the mounting groove is near the center of the groove width. It is characterized by being provided on both sides across

  ADVANTAGE OF THE INVENTION According to this invention, the fall of a gasket can be suppressed and the fall of the crushing cost (the amount compressed) of a gasket can be suppressed.

  In addition, said each structure can be employ | adopted combining as much as possible.

  As described above, according to the present invention, even if the cross-sectional shape is a vertically long gasket, the fall of the gasket can be suppressed.

  Further, in a gasket having a vertically long cross-sectional shape, it is possible to suppress a decrease in sealing performance due to the collapse of the gasket.

  The best mode for carrying out the present invention will be exemplarily described in detail below 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. .

  The sealing structure and gasket mounting groove according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic cross-sectional view in the vicinity of a gasket mounting groove according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a gasket according to an embodiment of the present invention. FIG. 3 is a part of a plan view of the gasket according to the embodiment of the present invention. In FIG. 3, the AA section corresponds to FIG. FIG. 4 is a schematic cross-sectional view of the sealing structure according to the first embodiment of the present invention. FIG. 4 shows a state when the gasket is assembled.

<Outline of sealing structure>
The sealing structure according to the present embodiment has two members (one member 10 and the other member) that are assembled together by means of a gasket 30 by means not shown (for example, known means such as fitting, fastening by screws, and bonding). 20) It is a structure that seals the gap between them. FIG. 1 and FIG. 4 show a state before one member 10 and the other member 20 are assembled. The state after assembling them is not particularly shown, but depending on the target product, the surface of one member 10 and the other member 20 so that the mounting groove 11 provided in one member 10 is closed. In some cases, both are assembled so that the surfaces are in close contact with each other, and in some cases, both are assembled so as to have a certain gap between them.

<Details of mounting groove>
In particular, the gasket mounting groove according to the first embodiment of the present invention will be described in more detail with reference to FIG. As shown in the figure, one member 10 is provided with a mounting groove 11 for mounting the gasket 30. The planar shape of the mounting groove 11 (as viewed from above) is similar to the planar shape of the main body 30a of the gasket 30, although not particularly illustrated. Further, both side surfaces of the mounting groove 11 are formed by surfaces parallel to each other. Further, the groove width of the mounting groove 11 is configured to be wider than the lateral width of the main body portion 30 a of the gasket 30.

  The mounting groove 11 is configured so that the center of the groove width is the deepest, and the groove bottom 12 is provided with a curved surface that is curved so that both sides are targeted with respect to the center of the groove width. ing. In this embodiment, most of the groove bottom 12 is formed by a curved surface, and on both sides of the curved surface, a flat inclined surface (at least near the AA cross section shown in FIG. Is a flat inclined surface). With such a configuration, the groove bottom 12 is provided with inclined surfaces that gradually decrease the depth of the groove from the center of the groove width toward the both side surfaces of the mounting groove on both sides of the groove width center. become.

<Details of gasket>
In particular, the gasket 30 according to the embodiment of the present invention will be described in more detail with reference to FIGS. In addition, the planar shape (shape seen from the upper surface) of a gasket is various according to the target product with which a gasket is applied, and FIG. 3 only showed a part of the example. For example, as a planar shape of the gasket, there are a circular shape, a polygonal shape, and a complicated shape.

  The gasket 30 according to the present embodiment includes a main body 30a and a pair of protrusions 33 and 34 that protrude from the main body 30a to both sides in the width direction.

  The main body 30a has a pair of curved sealing surfaces 31, 32. One of these sealing surfaces 31 and 32 is in close contact with the groove bottom 12 of the mounting groove 11 provided in one member 10, and the other is in close contact with the surface of the other member 20. Seal the gap. The main body 30a has a vertically long cross section (a shape in which the distance between the tips of the seal surfaces 31 and 32 is longer than the thickness in the width direction in an uncompressed state). The “transverse section” means a section perpendicular to the longitudinal direction of the gasket 30. For example, an AA section in FIG. 3 corresponds to this. Thus, the reason why the cross section of the main body 30a is a vertically long shape is to achieve a crushing rate and a filling rate that satisfy the sealing performance even in a small size. Further, in order to improve the mounting property of the gasket 30 to the mounting groove 11, the lateral width of the main body portion 30 a is configured to be narrower than the lateral width of the mounting groove 11.

  The pair of projecting portions 33 and 34 are configured such that the width between these tip portions is approximately the same as the groove width of the mounting groove 11. Thereby, when the gasket 30 falls in the mounting groove 11, the pair of projecting portions 33 and 34 abut against both side surfaces of the mounting groove 11. Accordingly, the protrusions 33 and 34 support the gasket 30 so that the gasket 30 can be prevented from falling. In addition, a plurality of pairs of the pair of projecting portions 33 and 34 are partially provided in the longitudinal direction of the gasket 30. The more the protrusions 33 and 34 are provided at a small interval, the higher the function of suppressing the collapse of the gasket 30, while the mounting property of the gasket 30 to the mounting groove 11 decreases. Therefore, the interval and the number of sets for providing the protrusions 33 and 34 are set to be appropriate in consideration of both the fall prevention function and the wearability.

  Further, as can be seen from FIG. 2, the cross section of the gasket 30 is a line connecting the tips of the pair of seal surfaces 31 and 32 (a line passing through the tip of the seal surface 31 (32) and perpendicular to the tangent of the tip). The shape is symmetric with respect to Y (that is, symmetrical in FIG. 2). Further, as can be seen from FIG. 2, the cross section of the gasket 30 has a center line between the pair of seal surfaces 31, 32 (parallel to the tangent at the tip of the seal surface 31 and parallel to the tangent at the tip of the seal surface 32. Thus, the shape is a target (that is, a vertical target in FIG. 2) with respect to X between these lines.

  In this embodiment, the radius of curvature of the curved surface provided on the groove bottom 12 of the mounting groove 11 is R1 (see FIG. 1), and the radius of curvature of the seal surfaces 31 and 32 of the gasket 30 is R2 ( 2), and is configured to satisfy R1> R2. As a result, there is no gap between one of the sealing surfaces 31 and 32 of the gasket 30 (the sealing surface 32 in FIG. 4) and the groove bottom 12 of the mounting groove 11, and they are in close contact with each other.

  Further, in the present embodiment, the depth of the curved groove bottom 12 is H1 (see FIG. 1), and the distance from the tips of the seal surfaces 31, 32 of the gasket 30 to the protrusions 33, 34 is H2. In the case (refer to FIG. 2), it is configured to satisfy H1 <H2. This is to prevent the protrusions 33 and 34 from interfering with the groove bottom 12 when the gasket 30 is not tilted.

<Excellent points of this embodiment>
As shown in FIG. 4, after the gasket 30 is mounted in the mounting groove 11, the gasket 30 is compressed by the assembly of the one member 10 and the other member 20. In addition, the arrow in FIG. 4 has shown the direction of the force which the gasket 30 receives from both. That is, the arrow F1 indicates the direction of the force received from the other member 20, and the arrow F2 indicates the direction of the force received from the one member. As shown in FIG. 4, when the direction of these forces deviates from the center of the gasket 30, the gasket 30 falls down. However, the protrusions 33 and 34 abut against both side surfaces of the mounting groove 11 to prevent the gasket 30 from falling.

  In this embodiment, the groove bottom 12 of the mounting groove 11 also functions to prevent the gasket 30 from falling. That is, in this embodiment, the groove bottom 12 is provided with a curved surface as described above. As a result, the groove bottom 12 is provided with inclined surfaces that gradually decrease the depth of the groove from the center of the groove width toward both side surfaces of the mounting groove on both sides of the groove width center. Therefore, when the gasket 30 falls down, the contact position of the gasket 30 on the groove bottom side seal surface 32 with the groove bottom 12 is shifted from the center of the groove width (the deepest part of the groove). Therefore, the force acting on the gasket 30 from the groove bottom 12 is inclined toward the center of the gasket 30 as indicated by an arrow F2 in FIG. As a result, a component force F <b> 3 in the direction in which the gasket 30 is raised is generated from the inclined surface provided on the groove bottom 12 to the seal surface 32 of the gasket 30.

  Moreover, since the inclined surface provided in the groove bottom 12 is inclined so as to decrease the depth of the groove toward the side surface of the mounting groove 11, the distance between the surface of the other member 20 and the groove bottom 12 is as follows. It becomes narrower as it goes to the side surface of the mounting groove 11. Therefore, the seal surface 32 on the groove bottom side of the gasket 30 can be prevented from sliding the groove bottom 12 toward the side surface side of the mounting groove 11. Therefore, when the gasket 30 falls down, the seal surface 32 on the groove bottom 12 side of the gasket 30 slides on the groove bottom 12 of the mounting groove 11 toward the side surface of the mounting groove 11, but this sliding is suppressed. The From the above, the fall of the gasket 30 can be suppressed.

  Even if the gasket 30 is tilted to some extent, the gap between the surface of the other member 20 and the groove bottom 12 becomes narrower toward the side surface of the mounting groove 11 as described above. Decrease in the amount).

As described above, coupled with being able to suppress the collapse of the gasket 30, it is possible to suppress a decrease in the crushing cost of the gasket 30 even if the gasket 30 is collapsed. Can be suppressed. Therefore, since the gasket 30 is small in size, the rigidity of the protrusions 33 and 34 is low, and even if the protrusions 33 and 34 alone are not sufficient to prevent the gasket 30 from falling down, stable sealing performance can be realized. .

  In addition, as described above, the mounting groove 11 and the gasket 30 are objects with respect to the width direction (symmetrical with respect to the center in FIGS. 1, 2, and 4). Regardless, the collapse of the gasket 30 can be suppressed, and the reduction of the crushing cost of the gasket 30 can be suppressed. Further, the gasket 30 has a shape whose cross section is a target with respect to the center line between the pair of seal surfaces 31 and 32 (in FIG. 2, the target is up and down with respect to the center line X). Even when the shape of the gasket 30 is the same, such as a circle, an ellipse, or a regular polygon, the gasket 30 can be mounted in the mounting groove 11 regardless of the orientation of the front and back. Therefore, even when the gasket 30 has the same shape on both sides, it is not necessary to check the front and back of the gasket 30 when the gasket 30 is mounted in the mounting groove 11.

  FIG. 5 shows a second embodiment of the present invention. In the first embodiment, the configuration in which the curvature radius of the curved surface provided at the groove bottom of the mounting groove is made larger than the curvature radius of the gasket seal surface is shown. In contrast, in this embodiment, a configuration is shown in which the curvature radius of the curved surface provided at the groove bottom of the mounting groove is made smaller than the curvature radius of the seal surface of the gasket. Since other configurations and operations are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 5 is a schematic cross-sectional view of a sealing structure according to Embodiment 2 of the present invention. FIG. 5 shows a state when the gasket is assembled. Also in the present embodiment, similarly to the first embodiment, the groove bottom 12a of the mounting groove 11a in one member 10a is provided with a curved surface at the center of the groove width. In this embodiment, the radius of curvature R3 of the curved surface is configured to be smaller than the radius of curvature R2 of the seal surfaces 31 and 32 of the gasket 30. Further, flat inclined surfaces are continuously provided on both sides of the curved surface, and a groove bottom 12a is constituted by these. In the case of such a configuration, there are three places where the sealing surfaces 31 and 32 of the gasket 30 are in close contact with the mating member (one member 10a and the other member 20) as shown by circles in FIG.

  A gap is formed between the seal surface 32 of the gasket 30 and the groove bottom 12a of the mounting groove 11a at the deepest portion of the groove bottom 12a. However, since the sealing surface 32 of the gasket 30 and the groove bottom 12a of the mounting groove 11a are in close contact with each other, the sealing performance is maintained.

  Also in this embodiment, as in the first embodiment, the groove bottom 12a has an inclined surface (curved slope) that gradually decreases the depth of the groove from the center of the groove width toward both side surfaces of the mounting groove. Surface and planar inclined surface) are provided on both sides of the center of the groove width. Accordingly, as in the first embodiment, the gasket 30 can be prevented from falling and the collapse cost of the gasket 30 can be prevented from being lowered.

FIG. 1 is a schematic cross-sectional view in the vicinity of a gasket mounting groove according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a gasket according to an embodiment of the present invention. FIG. 3 is a plan view of the gasket according to the 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 a sealing structure according to Embodiment 2 of the present invention. FIG. 6 is a diagram for explaining the problems of the sealing structure according to the conventional example. FIG. 7 is a schematic cross-sectional view of a conventional gasket. FIG. 8 is a schematic cross-sectional view of a conventional gasket.

Explanation of symbols

10, 10a One member 11, 11a Mounting groove 12, 12a Groove bottom 20 Other member 30, 30X, 30Y Gasket 30a Main body 31, 32 Seal surface 33, 34 Projection

Claims (5)

In a sealing structure for sealing a gap between two members by a gasket having a pair of curved sealing surfaces,
The gasket includes a main body portion in which the distance between the tips of the sealing surfaces is longer than the thickness in the width direction in an uncompressed state,
One member of the two members is provided with a mounting groove for mounting the gasket,
On the groove bottom of the mounting groove, inclined surfaces that gradually decrease the depth of the groove from the vicinity of the center of the groove width toward the both side surfaces of the mounting groove are provided on both sides across the vicinity of the center of the groove width. The sealing structure characterized by having. The transverse cross section of the gasket is symmetrical with respect to the center line connecting the tips of the pair of sealing surfaces,
The mounting groove is configured so that the center of the groove width is deepest, and the groove bottom is provided with curved surfaces that are curved on both sides with respect to the center of the groove width. The sealing structure according to claim 1. The groove width of the mounting groove is configured wider than the lateral width of the main body of the gasket,
The gasket is provided with a plurality of pairs of protrusions that partially protrude from the main body on both sides in the width direction and are in contact with both side surfaces of the mounting groove in the longitudinal direction of the gasket. The sealing structure according to claim 1 or 2, wherein   4. The sealing structure according to claim 1, wherein a cross section of the gasket has a symmetrical shape with respect to a center line between a pair of sealing surfaces. In a gasket mounting groove in which a gasket having a pair of curved sealing surfaces and a gasket having a main body portion in which the distance between the tips of the sealing surfaces is longer than the thickness in the width direction in an uncompressed state is mounted ,
On the groove bottom to which one of the sealing surfaces of the gasket is closely attached, an inclined surface that gradually decreases the depth of the groove from the vicinity of the center of the groove width toward the both side surfaces of the mounting groove is near the center of the groove width. A mounting groove for a gasket, characterized in that it is provided on both sides of the gasket.

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