JP5598065B2 - Sealing structure - Google Patents

Description

  The present invention relates to a sealing structure provided with a gasket.

  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.

  A conventional gasket having such a configuration will be described with reference to FIG. FIG. 8 is a schematic cross-sectional view showing a state when the gasket according to the conventional example is mounted. The gasket 500 according to this conventional example is mounted in an annular groove 201 provided in the intake manifold 200 and used to seal a gap between the opposing surfaces of the intake manifold 200 and the cylinder block 300.

  As shown in the drawing, the gasket 500 includes a gasket main body 510 having a vertically long cross section, a first seal protrusion 511 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 512. In addition, a plurality of protrusions 521 and 522 are provided on the outer peripheral side and the inner peripheral side of the gasket main body 510 so as to prevent the gasket main body 510 from falling in the annular groove 201 at intervals in the circumferential direction. . FIG. 8 is a cross-sectional view taken along a direction perpendicular to the longitudinal direction of the gasket 500 at a portion where the protrusions 521 and 522 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. 8). Accordingly, the gasket 500 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 projection 511 comes into close contact with the groove bottom surface of the annular groove 201, and the second seal projection 512 comes into close contact with the mounting surface 301 of the cylinder block 300, thereby exhibiting sealing performance. In addition, the gasket main body 510 has a vertically long cross-section, and although it is easy to fall down or buckle in the annular groove 201, the protrusions 521 and 522 are formed on both side surfaces of the annular groove 201 as the gasket 500 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 512 in the gasket 500 in a direction inclined with respect to the direction perpendicular to the facing surface, the second seal projection 512 is deformed to fall down. Therefore, the gasket 500 cannot be compressed while maintaining a substantially symmetric state with respect to the center in the width direction (left and 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 500 is annular, the direction of the force applied to the second seal protrusion 512 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.

  Further, depending on how the second seal projection 512 is deformed, as shown in FIG. 9, the vicinity of the tip Z of the second seal projection 512 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 JP 2003-120817 A

  The objective of this invention is providing the sealing structure which suppresses the fall of the gasket in a mounting groove.

  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 assembled together;
An annular groove provided in one of these two members;
An annular gasket mounted in the annular groove and sealing a gap between the opposing surfaces of the two members,
The two members are assembled in a direction inclined with respect to a direction perpendicular to the facing surface, and the gasket is configured to be compressed by the two members,
The gasket is
An annular reinforcing ring,
A gasket main body made of a vertically long rubber-like elastic body that is provided integrally with the reinforcing ring and whose cross-sectional shape is longer in the mounting direction in the annular groove than in the width direction. And
The annular groove is provided with a position restricting portion that restricts the inclination of the reinforcing ring by abutting the reinforcing ring.

  According to the present invention, the deformation of the gasket main body is suppressed by the reinforcing ring, and the inclination of the reinforcing ring is limited by the position restricting portion provided in the annular groove, so that the fall of the gasket in the annular groove is suppressed. Further, along with this, it is possible to suppress the tip of the gasket body from jumping out of the annular groove. From these things, the stable sealing performance is exhibited.

Here, the reinforcing ring is composed of a disk-shaped member having a hole in the center,
The gasket is configured to be attached to the annular groove with a gap between the peripheral surface on the side surface side of the annular groove and the peripheral surface on the side surface side of the reinforcing ring,
When the gasket is tilted with respect to the annular groove, at least a part of an edge of the circumferential surface of the reinforcing ring abuts against the circumferential surface of the annular groove, so that the inclination of the reinforcing ring is limited. .

  Thereby, the inclination of a reinforcement ring can be restrict | limited with a simple structure.

The reinforcing ring is
A disc having a hole in the center and a part of which is embedded in the gasket body;
A cylindrical portion bent from an end of the disc portion, and
It is also preferable that the annular groove includes a loose fitting groove that is fitted in a state in which the tip side of the cylindrical portion has play.

  Thereby, the inclination of a reinforcement ring can be restrict | limited more reliably.

  As described above, according to the present invention, the gasket can be prevented from falling in the mounting groove, and a stable sealing performance can be maintained.

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 plan view of the gasket according to the first embodiment of the present invention. FIG. 3 is a schematic enlarged cross-sectional view (a diagram showing a state before two members are assembled) of the sealing structure according to the first embodiment of the present invention. FIG. 4 is a schematic enlarged cross-sectional view (a diagram showing a state after two members are assembled) of the sealing structure according to the first embodiment of the present invention. FIG. 5 is a schematic enlarged cross-sectional view (a diagram showing a state before two members are assembled) of the sealing structure according to the second embodiment of the present invention. FIG. 6 is a schematic enlarged cross-sectional view (a diagram showing a state before two members are assembled) of the sealing structure according to the third embodiment of the present invention. FIG. 7 is a schematic enlarged cross-sectional view (a diagram showing a state before two members are assembled) of the sealing structure according to the fourth embodiment of the present invention. FIG. 8 is a schematic cross-sectional view showing a state when the gasket according to the conventional example is mounted. FIG. 9 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. 1-4, the sealing structure which concerns on Example 1 of this invention is 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. FIG. 1 is a schematic cross-sectional view of a sealing structure according to Embodiment 1 of the present invention. 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 210 is provided on the side of the intake manifold 200 facing the cylinder block 300. The gasket 100 is attached to the annular groove 210. The gasket 100 is used to seal a gap between the opposed surfaces of the intake manifold 200 and the cylinder block 300. In addition, in FIG. 1, the structure of the gasket 100 and the annular groove 210 is shown simply.

  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 FIG. 2 to FIG. 4, the gasket 100 and a structure for suppressing the collapse of the gasket 100 will be described. 2 is a plan view of the gasket 100, and FIGS. 3 and 4 are schematic enlarged sectional views of the sealing structure. 3 and 4 correspond to the AA cross section in FIG. 3 shows a state before the intake manifold 200 and the cylinder block 300 are assembled, and FIG. 4 shows a state after these are assembled.

  The gasket 100 includes a metal reinforcing ring 120 and a rubber main body 110 made of a rubber-like elastic body integrally provided on the inner peripheral end side of the reinforcing ring 120. The gasket 100 can be manufactured by insert molding using the reinforcing ring 120 as an insert part.

  The reinforcing ring 120 is composed of a disk-shaped member having a hole in the center. As the material of the reinforcing ring 120, various metals such as iron-based, aluminum-based, and stainless-based materials and hard resin materials can be applied.

  The gasket body 110 is composed of an annular member. Further, the cross-sectional shape of the gasket body 110 (the shape of the cross section perpendicular to the circumferential direction) is a vertically long shape in which the length in the mounting direction to the annular groove 210 is longer than the width direction. The vertically long seal projections are configured to be in close contact with the intake manifold 200 and the cylinder block 300, respectively. Further, the seal projections at both ends are configured to be tapered.

  The annular groove 210 is a stepped groove including a deep groove portion 211 in which the gasket main body 110 is mounted and a shallow groove portion 212 into which the reinforcing ring 120 enters. The inner diameter of the inner peripheral surface 212 a in the shallow groove portion 212 is set slightly larger than the outer diameter of the reinforcing ring 120. Thereby, when the gasket 100 is mounted in the annular groove 210, the gasket 100 is in an annular groove with a minute gap between the inner peripheral surface 212 a of the annular groove 210 and the outer peripheral surface of the reinforcing ring 120. 210 is attached. Thereby, the gasket 100 can be easily attached to the annular groove 210. In addition, in order to ensure the crushing allowance of the gasket main body 110, an appropriate gap is provided between the groove bottom portion of the shallow groove portion 212 and the reinforcing ring 120 as shown in FIG.

Further, when the gasket 100 is inclined with respect to the annular groove 210, at least a part of the edge of the outer peripheral surface of the reinforcing ring 120 abuts against the inner peripheral surface 212 a of the annular groove 210, so that the inclination of the reinforcing ring 120 is limited. It is configured as follows. Thereby, the fall of the gasket 100 in the annular groove 210 is suppressed. The inner peripheral surface 212a of the annular groove 210 functions as a position restricting portion that restricts the inclination of the reinforcing ring 120.

<Excellent point of sealing structure according to this embodiment>
According to the sealing structure of the present embodiment, the tip of the gasket body 110 receives a force from the mounting surface 301 of the cylinder block 300 in the process of assembling the intake manifold 200 and the cylinder block 300 in the direction of arrow V in FIG. The direction of receiving this force is inclined with respect to the compression direction of the gasket body 110. Therefore, a force acts on the gasket 100 in the direction of rotation in the direction of arrow M in FIG.

  However, as described above, the gasket 100 according to the present embodiment includes the reinforcing ring 120, and the reinforcing ring 120 itself hardly deforms. Therefore, deformation of the gasket body 110 is also suppressed. In addition, the inclination of the reinforcing ring 120 is limited by at least a part of the edge on the outer peripheral surface of the reinforcing ring 120 abutting against the inner peripheral surface 212 a of the annular groove 210. That is, as shown in FIG. 4, the lower edge of the outer peripheral surface abuts on the inner peripheral surface 212 a of the annular groove 210 on the upper side of the reinforcing ring 120. In addition, on the lower side of the reinforcing ring 120, the upper edge of the outer peripheral surface abuts against the inner peripheral surface 212 a of the annular groove 210. Thereby, the inclination of the reinforcing ring 120 is limited, and the inclination (falling) of the gasket 100 in the annular groove 210 is suppressed.

  From these things, the attitude | position of the gasket 100 in the annular groove 210 can be stabilized. Further, along with this, it is possible to suppress the seal protrusion at the tip of the gasket body 110 from jumping out of the annular groove 210. In the present embodiment, the seal protrusion is tapered to prevent the annular groove 210 from protruding to the outside. Here, by providing a chamfer such as a C surface or an R surface at the inner peripheral edge of the annular groove 210 (the inner peripheral edge of the deep groove portion 211), the protrusion of the seal protrusion to the outside of the annular groove 210 is further improved. You may enable it to suppress.

(Example 2)
FIG. 5 shows a second embodiment of the present invention. In the said Example 1, the case where a gasket was comprised from the reinforcement ring and the gasket main body integrally provided in the inner peripheral end side of the reinforcement ring was shown. On the other hand, in the present embodiment, a case is shown in which the gasket is composed of a reinforcing ring and a gasket body integrally provided on the outer peripheral end side of the reinforcing ring.

  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.

  The gasket 101 according to the present embodiment includes a metal reinforcing ring 121 and a rubber main body 111 made of a rubber-like elastic body provided integrally on the outer peripheral end side of the reinforcing ring 121.

  The manufacturing method of the gasket 101, examples of the shape and material of the reinforcing ring 121, the shape of the gasket main body 111, and the like are the same as in the first embodiment except that the positional relationship between the reinforcing ring 121 and the gasket main body 111 is different. Therefore, the description is omitted.

The annular groove 220 is a stepped groove including a deep groove portion 221 in which the gasket main body 111 is mounted and a shallow groove portion 222 into which the reinforcing ring 121 enters. The outer diameter of the outer peripheral surface 222 a in the shallow groove portion 222 is set slightly smaller than the inner diameter of the reinforcing ring 121. Thereby, when the gasket 101 is mounted in the annular groove 220, the gasket 101 is in an annular groove with a minute gap between the outer peripheral surface 222a of the annular groove 220 and the inner peripheral surface of the reinforcing ring 121. 220 is attached. Thereby, the gasket 101 can be easily attached to the annular groove 220. In addition, in order to ensure the crushing allowance of the gasket main body 111, an appropriate clearance is provided between the groove bottom portion of the shallow groove portion 222 and the reinforcing ring 121 as shown in FIG.

  Further, when the gasket 101 is inclined with respect to the annular groove 220, at least a part of the edge on the inner peripheral surface of the reinforcing ring 121 abuts on the outer peripheral surface 222 a of the annular groove 220, so that the inclination of the reinforcing ring 121 is limited. It is configured as follows. Thereby, the fall of the gasket 101 in the annular groove 220 is suppressed. The outer peripheral surface 222 a of the annular groove 220 functions as a position restricting portion that restricts the inclination of the reinforcing ring 121. In the process of assembling the intake manifold 200 and the cylinder block 300 in the direction of arrow V in FIG. 5, force acts on the gasket 101 in the direction of rotation in the direction of arrow M in FIG.

  With the above configuration, even in the sealing structure according to the present embodiment, the same effect as that of the first embodiment can be obtained. Also in this embodiment, by providing a chamfer such as a C surface or an R surface at the outer peripheral edge of the annular groove 220 (the outer peripheral edge of the deep groove portion 221), the seal protrusion protrudes outside the annular groove 220. May be further suppressed.

(Example 3)
FIG. 6 shows a third embodiment of the present invention. In the said Example 1, 2, the reinforcement ring comprised by the disk-shaped member with a hole in the center was used, and the peripheral surface of this reinforcement ring (in Example 1, an outer peripheral surface, in Example 2, an internal peripheral surface) The case where the inclination of the reinforcing ring is limited by at least a part of the edge of the ring abutting against the circumferential surface of the annular groove (the inner circumferential surface in Example 1 and the outer circumferential surface in Example 2) is shown. On the other hand, in the present embodiment, a reinforcing ring including a disc portion having a hole in the center and a cylindrical portion bent from an end portion of the disc portion is used, and the cylindrical portion is loosely fitted in the loose fitting groove. A configuration in the case where the inclination of the reinforcing ring is limited by (fitting with play) is shown.

  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.

  The gasket 102 according to the present embodiment includes a metal reinforcing ring 122 and a rubber main body 112 made of a rubber-like elastic body provided integrally with the inner peripheral end of the reinforcing ring 122. The gasket 102 can be manufactured by insert molding using the reinforcing ring 122 as an insert part.

  The reinforcing ring 122 has a hole in the center, and a part (inner peripheral end) of the reinforcing ring 122 is bent from the outer peripheral end portion of the disc portion 122a and the circular disc portion 122a. And a cylindrical portion 122b. As the material of the reinforcing ring 122, various metals such as iron, aluminum, and stainless steel, and hard resin materials can be applied.

  The gasket body 112 is formed of an annular member. Further, the cross-sectional shape of the gasket body 112 (the cross-sectional shape perpendicular to the circumferential direction) is a vertically long shape in which the length in the mounting direction to the annular groove 230 is longer than the width direction. The vertically long seal projections are configured to be in close contact with the intake manifold 200 and the cylinder block 300, respectively. Further, the seal projections at both ends are configured to be tapered.

Further, the annular groove 230 according to the present embodiment includes a mounting groove portion 231 in which the gasket main body 112 is mounted and a loose fitting groove portion 232 in which the front end side of the cylindrical portion 122b in the reinforcing ring 122 is fitted with play. I have. Thus, in this embodiment, when the gasket 102 is mounted in the annular groove 230, the cylindrical portion 122b in the reinforcing ring 122 is fitted in the loose fitting groove portion 232 with play, The gasket 102 can be easily attached to the annular groove 230. In order to secure the crushing allowance of the gasket main body 112, an appropriate gap is provided between the groove bottom portion of the loose fitting groove portion 232 and the tip of the cylindrical portion 122b in the reinforcing ring 122 as shown in FIG. It is done.

  Further, when the gasket 102 is inclined with respect to the annular groove 230, the cylindrical portion 122b of the reinforcing ring 122 abuts against the inner peripheral surface and the outer peripheral surface of the loose fitting groove portion 232, so that the inclination of the reinforcing ring 122 is limited. Has been. That is, the reinforcing ring 122 can only play the play of the cylindrical portion 122 b with respect to the loosely fitting groove portion 232. Thereby, the fall of the gasket 102 in the annular groove 230 is suppressed. The inner peripheral surface and the outer peripheral surface of the loose fitting groove portion 232 function as a position restricting portion that restricts the inclination of the reinforcing ring 122.

  With the above configuration, the same effects as those of the first and second embodiments can be obtained in the sealing structure according to the present embodiment. In the case of the present embodiment, since the inclination of the reinforcing ring 122 can be easily limited by adjusting the play, the inclination of the reinforcing ring 122 can be more reliably suppressed as compared with the first and second embodiments. Also in this embodiment, by providing chamfers such as a C surface and an R surface on the inner peripheral edge of the annular groove 230 (the inner peripheral edge of the mounting groove portion 231), the seal protrusion protrudes outside the annular groove 230. It may be possible to further suppress the pop-up of.

Example 4
FIG. 7 shows a fourth embodiment of the present invention. In the said Example 3, the structure in the case of providing a gasket main body integrally in the inner peripheral end side of a reinforcement ring was shown. On the other hand, in a present Example, the structure in the case of providing a gasket main body integrally in the outer peripheral end side of a reinforcement ring is shown.

  Since other configurations and operations are the same as those of the third embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  The gasket 103 according to the present embodiment includes a metal reinforcing ring 123 and a rubber main body 113 made of a rubber-like elastic body provided integrally on the outer peripheral end side of the reinforcing ring 123.

  The reinforcing ring 123 has a hole in the center, and a part (outer peripheral end) of the reinforcing ring 123 is bent from the inner peripheral end of the disc part 123a and the disc part 123a. And a cylindrical portion 123b.

  The manufacturing method of the gasket 103, the example of the material of the reinforcing ring, the shape of the gasket main body 113, and the like are the same as those in the third embodiment except that the positional relationship between the reinforcing ring 123 and the gasket main body 113 is different. Description is omitted.

  Further, the annular groove 240 according to the present embodiment includes a mounting groove part 241 in which the gasket main body 113 is mounted, and a loose fitting groove part 242 in which the front end side of the cylindrical part 123b in the reinforcing ring 123 is fitted with play. I have. Thus, in this embodiment, when the gasket 103 is mounted in the annular groove 240, the cylindrical portion 123b in the reinforcing ring 123 is fitted into the loose fitting groove portion 242 with play, The gasket 103 can be easily attached to the annular groove 240. In order to secure the crushing allowance of the gasket main body 113, an appropriate gap is provided between the groove bottom portion of the loose fitting groove portion 242 and the tip of the cylindrical portion 123b in the reinforcing ring 123, as shown in FIG. It is done.

With the configuration as described above, even in the case of the present embodiment, the reinforcing ring 123 can only play the play of the cylindrical portion 123b with respect to the loosely fitting groove portion 242. Therefore, the same effect as in the third embodiment can be obtained. Also in this embodiment, by providing chamfers such as a C surface and an R surface at the outer peripheral edge of the annular groove 240 (the outer peripheral edge of the mounting groove 241), the seal protrusion protrudes outside the annular groove 240. May be further suppressed.

100, 101, 102, 103 Gasket 110, 111, 112, 113 Gasket body 120, 121, 122, 123 Reinforcement ring 122a, 123a Disc part 122b, 123b Cylindrical part 200 Intake manifold 210, 220, 230, 240 Annular groove 211 , 221 Deep groove portion 212, 222 Shallow groove portion 212a Inner peripheral surface 222a Outer peripheral surface 231, 241 Mounting groove portion 232, 242 Free fitting groove portion 300 Cylinder block 301 Mounting surface

Claims (2)

Two members assembled together;
An annular groove provided in one of these two members;
An annular gasket mounted in the annular groove and sealing a gap between the opposing surfaces of the two members,
The two members are assembled in a direction inclined with respect to a direction perpendicular to the facing surface, and the gasket is configured to be compressed by the two members,
The gasket is
An annular reinforcing ring,
A gasket main body made of a vertically long rubber-like elastic body that is provided integrally with the reinforcing ring and whose cross-sectional shape is longer in the mounting direction in the annular groove than in the width direction. And
The annular groove is provided with a position restricting portion that restricts the inclination of the reinforcing ring by striking the reinforcing ring ,
The reinforcing ring is composed of a disk-shaped member having a hole in the center,
The gasket is configured to be attached to the annular groove with a gap between the peripheral surface on the side surface side of the annular groove and the peripheral surface on the side surface side of the reinforcing ring,
When the gasket is inclined with respect to the annular groove, at least a part of the edge of the peripheral surface of the reinforcing ring abuts on the peripheral surface of the annular groove, thereby limiting the inclination of the reinforcing ring. Characteristic sealing structure. Two members assembled together;
An annular groove provided in one of these two members;
An annular gasket mounted in the annular groove and sealing a gap between the opposing surfaces of the two members,
The two members are assembled in a direction inclined with respect to a direction perpendicular to the facing surface, and the gasket is configured to be compressed by the two members,
The gasket is
An annular reinforcing ring,
A gasket main body made of a vertically long rubber-like elastic body that is provided integrally with the reinforcing ring and whose cross-sectional shape is longer in the mounting direction in the annular groove than in the width direction. And
The annular groove is provided with a position restricting portion that restricts the inclination of the reinforcing ring by striking the reinforcing ring ,
The reinforcing ring is
A disc having a hole in the center and a part of which is embedded in the gasket body;
A cylindrical portion bent from an end of the disc portion, and
The said annular groove is provided with the loose fitting groove | channel fitted with the front end side of the said cylindrical part with a play, The sealing structure characterized by the above-mentioned.

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