JP5434681B2 - Gasket and sealing structure - Google Patents

Description

  The present invention relates to a gasket and a sealing structure.

  Conventionally, an annular gasket that is mounted in an annular groove provided in one of two members and seals a gap between opposing surfaces of these two members is known. For example, an annular gasket is used to seal a gap between opposed surfaces of an intake manifold and a cylinder block provided in an automobile.

  Such a gasket is compressed by two members, and exhibits a sealing property by its repulsive force. Here, when at least one of the two members is made of a resin material, the dimensional accuracy may not be so high due to the influence of waviness or creep during molding. Therefore, it is necessary to be able to exhibit the sealing performance even when the dimensions vary. In addition, because of the space, the cross-sectional shape of the annular groove in which the gasket is mounted may be a vertically long cross section. In such a case, the cross section of the gasket must also be a vertically long cross section, and there is a problem that the gasket is liable to collapse or buckle in the annular groove. As a countermeasure against such a problem, a technique is conventionally known in which a plurality of protrusions for suppressing the collapse of the gasket are provided on the outer peripheral side and the inner peripheral side of the gasket at intervals in the circumferential direction.

  The gasket according to the conventional example configured as described above will be described with reference to FIG. FIG. 9 is a schematic cross-sectional view showing a state when the gasket according to the conventional example is mounted. The gasket 100 according to this conventional example is mounted in an annular groove 201 provided in the intake manifold 200 and used to seal the gap between the opposing surfaces of the intake manifold 200 and the cylinder block 300.

  As shown in the figure, the gasket 100 includes a gasket main body 110 having a vertically long cross section, a first seal protrusion 111 that is in close contact with the groove bottom surface of the annular groove 201, and a second seal that is in close contact with the mounting surface 301 of the cylinder block 300. And a protrusion 112. Further, on the outer peripheral side and the inner peripheral side of the gasket main body 110, a plurality of protrusions 121 and 122 for suppressing the gasket main body 110 from falling in the annular groove 201 are provided at intervals in the circumferential direction. . FIG. 9 is a cross-sectional view taken along a direction perpendicular to the longitudinal direction of the gasket 100 at a portion where the protrusions 121 and 122 are provided.

  Here, in general, intake manifold 200 and cylinder block 300 are assembled in a direction perpendicular to these opposing surfaces (in the direction of arrow X in FIG. 9). Accordingly, the gasket 100 configured as described above is compressed while maintaining a substantially symmetric state with respect to the center in the width direction (left-right direction) in the illustrated cross section. As a result, the first seal protrusion 111 closely contacts the groove bottom surface of the annular groove 201 and the second seal protrusion 112 closely contacts the mounting surface 301 of the cylinder block 300, thereby exhibiting sealing performance. In addition, the gasket main body 110 has a vertically long cross section, and although it is easy to fall down or buckle in the annular groove 201, the protrusions 121 and 122 are formed on both side surfaces of the annular groove 201 as the gasket 100 is compressed. Falling down and buckling are suppressed by striking each.

However, the intake manifold 200 and the cylinder block 300 may be configured to be assembled in a direction inclined with respect to a direction perpendicular to the opposed surfaces. For example, it may be assembled in the direction of arrow Y in FIG. In this case, since a force is applied to the second seal projection 112 in the gasket 100 in a direction inclined with respect to the direction perpendicular to the facing surface, the second seal projection 112 is deformed to fall. Therefore, the gasket 100 cannot be compressed while maintaining a substantially symmetric state with respect to the center in the width direction (left-right direction) in the illustrated cross section, and is compressed in an asymmetric state with respect to the center. End up. In addition, since the gasket 100 is annular, the direction of the force applied to the second seal projection 112 varies depending on the portion to which the force is applied, and the manner of deformation varies depending on the portion. Therefore, the sealing performance becomes unstable.

  Depending on how the second seal projection 112 is deformed, as shown in FIG. 10, the vicinity Z of the tip of the second seal projection 112 is near the opening edge of the annular groove 201 in the intake manifold 200 and the cylinder block. It is also conceivable to be caught between the 300 attachment surfaces 301. In this case, the seal function may be impaired due to cracks or chipping in the vicinity of the tip Z.

JP-A-2005-3130

  An object of the present invention is to provide a gasket and a sealing structure that exhibit stable sealing performance even when two members are assembled in a direction inclined with respect to a direction perpendicular to these opposing surfaces. is there.

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

That is, the gasket of the present invention is
In an annular gasket that is mounted in an annular groove provided in one of the two members and seals the gap between the opposing surfaces of these two members,
A gasket compressed by these two members by being assembled in a direction inclined with respect to a direction perpendicular to the opposing surface,
An annular protrusion extending from the gasket main body to the other member of the two members and extending in a direction inclined with respect to a direction perpendicular to the facing surface;
The annular protrusion has a tapered surface whose surface faces the other member side,
A central axis of the tapered surface is set to coincide with a direction perpendicular to the facing surface when the two members are assembled, and a taper angle γ of the tapered surface is equal to the taper angle of the two members with respect to the central axis. When the inclination in the assembly direction is θ, γ> 2θ is satisfied.

  According to the present invention, in the process of assembling the two members, the tapered surface of the annular protrusion provided on the gasket hits the other member. And since this taper surface satisfies the above relationship, as the gasket is compressed, the annular protrusion is deformed so that the taper surface is curved in a convex direction. In this way, by assembling the two members, the annular protrusion provided on the gasket can be deformed in a desired direction. In other words, the manner of deformation of the annular protrusion can be controlled. Therefore, stable sealing performance can be exhibited.

On the outer peripheral side and the inner peripheral side of the gasket main body part, a plurality of protrusions for suppressing the collapse of the gasket main body part in the annular groove are provided at intervals in the circumferential direction,
In the state before being compressed by the two members, the projecting length of the plurality of protrusions provided on the peripheral surface opposite to the extending direction of the annular protrusion is t1, and the annular protrusion on the tapered surface When the length in the direction in which the groove extends is t2, the gap between the plurality of protrusions provided on the opposite peripheral surface and the side wall surface of the annular groove is t3, and the lateral width of the annular groove is W In addition, it is preferable that t1 + t2 + t3 <W is satisfied.

  Thereby, even if the gasket is compressed by the two members and the annular protrusion is deformed so as to fall down, it is possible to prevent the tip from jumping out of the annular groove.

The sealing structure of the present invention is
Two members assembled together;
In a sealing structure comprising: an annular gasket that is attached to an annular groove provided in one of the two members and seals a gap between opposing surfaces of these two members;
The two members are configured to be assembled in a direction inclined with respect to a direction perpendicular to the opposing surface, and the sealing structure is configured such that the gasket is compressed by the assembly of these two members,
The gasket is provided with an annular protrusion extending from the gasket main body portion to the other member of the two members and extending in a direction inclined with respect to a direction perpendicular to the facing surface,
The annular protrusion has a tapered surface whose surface faces the other member side,
A central axis of the tapered surface is set to coincide with a direction perpendicular to the facing surface when the two members are assembled, and a taper angle γ of the tapered surface is equal to the taper angle of the two members with respect to the central axis. When the inclination in the assembly direction is θ, γ> 2θ is satisfied.

  According to the present invention, in the process of assembling the two members, the tapered surface of the annular protrusion provided on the gasket hits the other member. And since this taper surface satisfies the above relationship, as the gasket is compressed, the annular protrusion is deformed so that the taper surface is curved in a convex direction. In this way, by assembling the two members, the annular protrusion provided on the gasket can be deformed in a desired direction. In other words, the manner of deformation of the annular protrusion can be controlled. Therefore, stable sealing performance can be exhibited.

On the outer peripheral side and the inner peripheral side of the gasket main body portion in the gasket, a plurality of protrusions that suppress the collapse of the gasket main body portion in the annular groove are provided at intervals in the circumferential direction,
In the state before being compressed by the two members, the projecting length of the plurality of protrusions provided on the peripheral surface opposite to the extending direction of the annular protrusion is t1, and the annular protrusion on the tapered surface When the length in the direction in which the groove extends is t2, the gap between the plurality of protrusions provided on the opposite peripheral surface and the side wall surface of the annular groove is t3, and the lateral width of the annular groove is W And satisfying t1 + t2 + t3 <W.

  Thereby, even if the gasket is compressed by the two members and the annular protrusion is deformed so as to fall down, it is possible to prevent the tip from jumping out of the annular groove.

  As described above, according to the present invention, even when the two members are assembled in a direction inclined with respect to a direction perpendicular to these opposing surfaces, stable sealing performance can be exhibited. .

1 is a schematic cross-sectional view (schematic cross-sectional view showing a state before two members are assembled) of a sealing structure according to Embodiment 1 of the present invention. FIG. 2 is a schematic view of a gasket according to Embodiment 1 of the present invention. FIG. 3 is an enlarged view of a part of FIG. FIG. 4 is an explanatory diagram relating to the angular dimension of each part in the sealing structure according to the first embodiment of the present invention. FIG. 5 is a schematic cross-sectional view showing a state after the two members are assembled in the gasket according to the first embodiment of the present invention. FIG. 6 is an explanatory diagram relating to the length of each part in the sealing structure according to the first embodiment of the present invention. FIG. 7 is an enlarged view of a part of a schematic cross-sectional view (schematic cross-sectional view showing a state before the two members are assembled) of the sealing structure according to the second embodiment of the present invention. FIG. 8 is an explanatory diagram relating to the angular dimension of each part in the sealing structure according to the second embodiment of the present invention. FIG. 9 is a schematic cross-sectional view showing a state when the gasket according to the conventional example is mounted. FIG. 10 is a schematic cross-sectional view showing a state after the two members are assembled in the gasket according to the conventional example.

  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. 1-6, the gasket which concerns on Example 1 of this invention, and the sealing structure provided with the same are demonstrated. In the present embodiment, the case where the two members constituting the sealing structure are an intake manifold and a cylinder block will be described as an example.

<Sealing structure>
In particular, with reference to FIG. 1, the configuration of the entire sealing structure according to the first embodiment of the present invention will be described. Intake manifold 200 and cylinder block 300 are configured to be assembled in the direction of arrow V in FIG. Here, as shown in FIG. 1, these assembly directions V are directions inclined with respect to a direction perpendicular to the facing surfaces.

  An annular groove 201 is provided on the side of the intake manifold 200 facing the cylinder block 300. The gasket 10 is attached to the annular groove 201. The gasket 10 is used to seal a gap between the opposed surfaces of the intake manifold 200 and the cylinder block 300.

  The intake manifold 200 according to the present embodiment has a V-shaped structure, and the intake pipe is branched in a V shape. Along with this, the mounting surface 301 of the cylinder block 300 with which the tip of the intake pipe abuts is formed by an inclined surface.

<Gasket>
In particular, with reference to FIGS. 2 and 3, the gasket according to the first embodiment of the present invention will be described in detail. 2A is a plan view, FIG. 2B is a sectional view taken along line AA in FIG. 2A, and FIG. 2C is a sectional view taken along line BB in FIG. FIG. 3 is an enlarged view of the vicinity of the gasket in FIG.

The gasket 10 according to the present embodiment includes a gasket main body portion 11 having a vertically long cross section, a protruding portion 11a that is in close contact with the groove bottom surface of the annular groove 201, and an annular protruding portion 11b that is in close contact with the mounting surface 301 of the cylinder block 300. I have. The annular protrusion 11b is directed from the gasket body 11 to the mounting surface 301 of the cylinder block 300 and in a direction perpendicular to the opposing surface of the intake manifold 200 and the cylinder block 300 (the direction of arrow I in FIG. 3). It is comprised so that it may extend in the direction inclined with respect to it. More specifically, the annular protrusion 11b is configured to extend in a direction inclined toward the outer diameter side. Further, the annular protrusion 11 b has a tapered surface 11 c whose surface faces the mounting surface 301 side of the cylinder block 300.

  A plurality of protrusions 12 and 13 are provided on the outer peripheral side and the inner peripheral side of the gasket main body 11 so as to prevent the gasket main body 11 from falling in the annular groove 201 at intervals in the circumferential direction. .

<Annular protrusion>
In particular, the annular protrusion 11b will be described in more detail with reference to FIGS. In FIG. 4, the relationship of the angular dimension of each part at the time of assembling the intake manifold 200 and the cylinder block 300 is shown. In FIG. 4, only the tapered surface 11c is shown for the annular protrusion 11b.

  In the present embodiment, the central axis T on the tapered surface 11c is set so as to coincide with the direction perpendicular to these opposing surfaces (I direction in FIG. 3) when the intake manifold 200 and the cylinder block 300 are assembled. Has been.

  The taper angle γ of the tapered surface 11c is configured to satisfy γ> 2θ, where θ is the inclination of the assembly direction V of the intake manifold 200 and the cylinder block 300 with respect to the central axis T.

  Here, as preferable examples of θ and γ, θ = 45 ° and γ = 120 ° can be given. In this embodiment, when the intake manifold 200 is assembled to the cylinder block 300 in a state where the cylinder block 300 is installed on a horizontal plane, the intake manifold 200 is assembled so as to move in the vertical direction. Therefore, as is apparent from FIG. 4, the inclination angle of the mounting surface 301 of the cylinder block 300 and the above θ are the same angle. In other words, the above θ is the inclination angle of the mounting surface 301.

  With the above-described configuration, the taper surface 11 c of the annular protrusion 11 b provided on the gasket 10 abuts on the mounting surface 301 of the cylinder block 300 in the process of assembling the intake manifold 200 and the cylinder block 300. And since this taper surface 11c satisfies the above relationships, as the gasket 10 is compressed, the annular protrusion 11b is deformed so that the taper surface 11c is curved in a convex direction. FIG. 5 shows a state where the intake manifold 200 and the cylinder block 300 are assembled.

  Next, the relationship of the length dimension of each part is demonstrated with reference to FIG.2 (c) and FIG.6 especially. Note that FIG. 6 shows the dimensions of each part in a state where the gasket 10 is mounted in the annular groove 201. However, for convenience of explanation, only the position of the tapered surface 11 c and the positions of the protrusions 12 and 13 are shown for the gasket 10. In addition, about the taper surface 11c, the state before the gasket 10 is compressed is shown with the dotted line, and the state after compression is shown with the continuous line. Moreover, about the protrusions 12 and 13, the position of the state before the gasket 10 is compressed is shown.

  Here, in the state before the gasket 10 is compressed, the protruding lengths of the plurality of protrusions 13 provided on the peripheral surface (in this embodiment, the inner peripheral surface) opposite to the direction in which the annular protrusion 11b extends. Is t1. Further, in the state before the gasket 10 is compressed, the length of the tapered surface 11c in the direction in which the annular protrusion 11b extends is defined as t2. Further, in a state before the gasket 10 is compressed, the plurality of protrusions 13 and the annular grooves 201 provided on the peripheral surface (in this embodiment, the inner peripheral surface) opposite to the direction in which the annular protrusion 11b extends. A gap between the side wall surface is t3.

  At this time, in this embodiment, when the lateral width of the annular groove 201 is W, it is configured to satisfy t1 + t2 + t3 <W.

  By being configured in this way, even when the gasket 10 is compressed and deformed so that the annular protrusion 11b falls down, it is possible to prevent the tip from jumping out of the annular groove 201.

<Excellent points of this embodiment>
As described above, according to the gasket 10 and the sealing structure including the gasket 10 according to the present embodiment, as the gasket 10 is compressed, the annular protrusion 11b is curved so that the tapered surface 11c is curved. It will be transformed. Thus, according to the present embodiment, when the intake manifold 200 and the cylinder block 300 are assembled, the annular protrusion 11b provided on the gasket 10 can be deformed in a desired direction. In other words, it is possible to control how the annular protrusion 11b is deformed. Therefore, stable sealing performance can be exhibited.

  Further, according to the present embodiment, as described above, even when the gasket 10 is compressed and the annular protrusion 11b is deformed so as to fall down, the tip of the gasket protrudes outside the annular groove 201. Can be suppressed. Therefore, it is possible to suppress the occurrence of cracks and chips caused by the tip of the annular protrusion 11b being caught in the gap between the intake manifold 200 and the cylinder block 300. Thereby, the fall of sealing performance can be suppressed.

(Example 2)
7 and 8 show a second embodiment of the present invention. In the first embodiment, the case where the annular protrusion is configured to extend in the direction inclined toward the outer diameter side is shown. On the other hand, Example 2 shows a case where the annular protrusion is configured to extend in a direction inclined toward the inner diameter side. 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 the description thereof is omitted as appropriate.

  As shown in FIG. 7, the gasket 15 according to the present embodiment also includes an annular protrusion 15 b that is in close contact with the mounting surface 301 of the cylinder block 300 as in the case of the first embodiment. As in the case of the first embodiment, the annular projecting portion 15 b is directed from the gasket main body portion 11 to the mounting surface 301 of the cylinder block 300 and perpendicular to the opposing surface of the intake manifold 200 and the cylinder block 300. It is comprised so that it may extend in the direction inclined with respect to a certain direction (arrow I direction in FIG. 7).

  In the present embodiment, unlike the first embodiment, the annular protrusion 15b is configured to extend in a direction inclined toward the inner diameter side. Further, the annular protrusion 15 b has a tapered surface 15 c whose surface faces the mounting surface 301 side of the cylinder block 300.

Although not particularly illustrated, the annular groove 201 is formed on the outer peripheral side and the inner peripheral side of the gasket main body 11.
As in the case of the first embodiment, a plurality of protrusions that prevent the gasket main body portion 11 from falling down are provided at intervals in the circumferential direction.

  In particular, the annular protrusion 15b will be described in more detail with reference to FIG. In FIG. 8, the relationship of the angular dimension of each part at the time of assembling the intake manifold 200 and the cylinder block 300 is shown. In FIG. 8, only the tapered surface 15c of the annular protrusion 15b is shown.

  In the present embodiment, the central axis T on the tapered surface 15c is in a direction perpendicular to these opposing surfaces when the intake manifold 200 and the cylinder block 300 are assembled, as in the first embodiment (FIG. 7). (Middle I direction).

  The taper angle γ of the tapered surface 15c is such that γ> 2θ, as in the case of the first embodiment, where θ is the inclination of the assembly direction V between the intake manifold 200 and the cylinder block 300 with respect to the central axis T. It is configured to meet.

  With the above-described configuration, also in the present embodiment, in the process of assembling the intake manifold 200 and the cylinder block 300, the tapered surface 15c of the annular protrusion 15b provided on the gasket 15 is the mounting surface 301 of the cylinder block 300. I hit it. And since this taper surface 15c satisfies the above relationships, as the gasket 15 is compressed, the annular protrusion 11b is deformed so that the taper surface 15c is curved in a convex direction.

  Therefore, the same effect as in the case of the first embodiment can be obtained. In addition, the length dimension of each part also satisfies the same relationship (t1 + t2 + t3 <W) as in the first embodiment. Therefore, even in the present embodiment, even when the gasket 15 is compressed and deformed so that the annular protrusion 15b falls down, it is possible to suppress the tip from jumping out of the annular groove 201.

(Other)
In the present embodiment, the intake manifold 200 and the cylinder block 300 are shown as the two members to which the gasket is attached. However, the two members are not limited to these, and various gaskets and sealing structures of the present invention can be used. It can be applied to other devices.

DESCRIPTION OF SYMBOLS 10 Gasket 11 Gasket body part 11a Protrusion part 11b Annular protrusion part 11c Tapered surface 12, 13 Protrusion 15 Gasket 15b Annular protrusion part 15c Tapered surface 200 Intake manifold 201 Annular groove 300 Cylinder block 301 Mounting surface

Claims (4)

In an annular gasket that is mounted in an annular groove provided in one of the two members and seals the gap between the opposing surfaces of these two members,
A gasket compressed by these two members by being assembled in a direction inclined with respect to a direction perpendicular to the opposing surface,
An annular protrusion extending from the gasket main body to the other member of the two members and extending in a direction inclined with respect to a direction perpendicular to the facing surface;
The annular protrusion has a tapered surface whose surface faces the other member side,
A central axis of the tapered surface is set to coincide with a direction perpendicular to the facing surface when the two members are assembled, and a taper angle γ of the tapered surface is equal to the taper angle of the two members with respect to the central axis. A gasket characterized by satisfying γ> 2θ when the inclination in the assembly direction is θ. On the outer peripheral side and the inner peripheral side of the gasket main body part, a plurality of protrusions for suppressing the collapse of the gasket main body part in the annular groove are provided at intervals in the circumferential direction,
In the state before being compressed by the two members, the projecting length of the plurality of protrusions provided on the peripheral surface opposite to the extending direction of the annular protrusion is t1, and the annular protrusion on the tapered surface When the length in the direction in which the groove extends is t2, the gap between the plurality of protrusions provided on the opposite peripheral surface and the side wall surface of the annular groove is t3, and the lateral width of the annular groove is W The gasket according to claim 1, wherein t1 + t2 + t3 <W is satisfied. Two members assembled together;
In a sealing structure comprising: an annular gasket that is attached to an annular groove provided in one of the two members and seals a gap between opposing surfaces of these two members;
The two members are configured to be assembled in a direction inclined with respect to a direction perpendicular to the opposing surface, and the sealing structure is configured such that the gasket is compressed by the assembly of these two members,
The gasket is provided with an annular protrusion extending from the gasket main body portion to the other member of the two members and extending in a direction inclined with respect to a direction perpendicular to the facing surface,
The annular protrusion has a tapered surface whose surface faces the other member side,
A central axis of the tapered surface is set to coincide with a direction perpendicular to the facing surface when the two members are assembled, and a taper angle γ of the tapered surface is equal to the taper angle of the two members with respect to the central axis. A sealing structure characterized by satisfying γ> 2θ, where θ is the inclination in the assembly direction. On the outer peripheral side and the inner peripheral side of the gasket main body portion in the gasket, a plurality of protrusions that suppress the collapse of the gasket main body portion in the annular groove are provided at intervals in the circumferential direction,
In the state before being compressed by the two members, the projecting length of the plurality of protrusions provided on the peripheral surface opposite to the extending direction of the annular protrusion is t1, and the annular protrusion on the tapered surface When the length in the direction in which the groove extends is t2, the gap between the plurality of protrusions provided on the opposite peripheral surface and the side wall surface of the annular groove is t3, and the lateral width of the annular groove is W In addition, the sealing structure according to claim 3, wherein t1 + t2 + t3 <W is satisfied.

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