JP2012067869A - Sealing structure and gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing structure and a gasket stabilized in posture of the gasket and improved in sealability.SOLUTION: This sealing structure is structured so that the gasket 10 slides on an installation surface 34 of an intake manifold 30 with the gasket 10 installed in an annular groove 21 of a throttle body 20 when assembling the throttle body 20 and the intake manifold 30. A fastening margin of the gasket 10 relative to the installation surface 34 is set so as to gradually change as the gasket 10 slides from the front to the rear in a sliding direction when the gasket 10 slides on the installation surface 34.

Description

  The present invention relates to a sealing structure and 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 throttle body provided in an automobile.

  Such a gasket is compressed by two members, and exhibits a sealing property by its repulsive force. Here, when the two members are assembled, if the distance between the opposing surfaces of the two members becomes narrower in a direction perpendicular to the opposing surfaces, the gasket is easily compressed and deformed so as to have a desired shape.

  However, depending on how the two members are assembled, in the process of assembling the two members, the gasket slides with respect to the other member of the two members, and the state of the gasket after the two members are assembled becomes unstable. May end up. This point will be described with reference to FIGS. FIG. 10 is a schematic cross-sectional view showing a process of assembling two members in a conventional sealing structure. FIG. 11 is a schematic cross-sectional view showing a sealing structure according to a conventional example.

  In the illustrated conventional example, a throttle body 200 having a throttle valve (not shown) is configured to be slid and mounted from the side surface side of the intake manifold 300 (side surface side of the intake passage 301). That is, the intake manifold 300 is provided with a recess 302 into which a tip of the throttle body 200 is inserted in a part of the inner peripheral surface of the intake passage 301, and the throttle body 200 is inserted at a position facing the recess 302. An insertion hole 303 is provided. With this configuration, the throttle body 200 can be inserted into the intake manifold 300 by inserting the throttle body 200 so as to penetrate the insertion hole 303 from the distal end side and inserting the distal end portion into the recess 302. .

  Here, the throttle body 200 is provided with annular grooves 201 on both surfaces (left and right surfaces in the figure), and the gaskets 100 are respectively attached to these annular grooves 201. These gaskets 100 are mounted in advance in the respective annular grooves 201, and in this state, the throttle body 200 is mounted on the intake manifold 300 (in the direction of arrow S in FIG. 10).

  In this manner, by providing the gasket 100 on both surfaces of the throttle body 200, the intake air is prevented from leaking outside through the insertion hole 303 provided in the intake manifold 300 from the intake passage 301. It becomes possible to do.

  In the sealing structure according to the conventional example configured as described above, the gasket 100 slides with respect to the mounting surface 304 of the intake manifold 300 in the process of mounting the throttle body 200 on the intake manifold 300. By this sliding, the gasket 100 is dragged in the direction opposite to the sliding direction (the direction of arrow K in FIG. 11). Therefore, the load at the time of inserting the throttle body 200 may be several times the seal load that compresses the gasket 100, and the gasket 100 is easily deformed so as to fall down.

  In the mounting process, the gasket 100 is dragged by a part such that the gasket 100 is dragged to the inner peripheral side of the gasket 100 on the front side in the sliding direction and the rear side is dragged to the outer peripheral side of the gasket 100. The direction is different. Therefore, in a state where the throttle body 200 is attached to the intake manifold 300, the posture of the gasket 100 is likely to be unstable, resulting in a decrease in sealing performance.

JP-A-2005-3130

  An object of the present invention is to provide a sealing structure and a gasket in which the posture of the gasket is stabilized and the sealing performance is improved.

  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 having surfaces facing each other in an assembled state;
An annular gasket that is mounted in an annular groove provided in one of the two members and seals a gap between opposing surfaces of the two members;
With
When the two members are assembled, the gasket is mounted in the annular groove, and the sealing structure is configured such that the gasket slides on the surface of the other member of the two members. There,
The fastening margin for the other member of the gasket is set so as to gradually change from the front to the rear in the sliding direction when the gasket slides on the surface of the other member. And

  Here, the “tightening allowance” is a dimension in which the gasket is compressed by the other member.

  According to the present invention, the gasket starts sliding and compressing by two members from a portion having a large interference, and gradually slides and compresses toward a region having a small interference. Therefore, the load accompanying the sliding resistance of the gasket in the process of assembling the two members can be suppressed. Further, since the gasket is sequentially slid and compressed according to the part, variation in compression deformation according to the part can be suppressed, and the posture of the gasket can be stabilized.

  Here, the height of the gasket may be configured to gradually change from the front to the rear in the sliding direction.

  Thereby, the interference with respect to the other member in the gasket can be set so as to gradually change from the front to the rear in the sliding direction when the gasket slides on the surface of the other member.

  It is also preferable that the depth of the mounting groove is configured to gradually change from the front to the rear in the sliding direction.

Also by doing this, the tightening allowance for the other member in the gasket is
The gasket can be set to gradually change from the front to the rear in the sliding direction when sliding on the surface of the other member.

The gasket includes an annular protrusion extending from the main body of the gasket toward the other member and extending in a direction inclined with respect to a direction perpendicular to the opposing surfaces of the two members,
The inner peripheral surface of the annular protrusion is configured to face the other member side,
It is good to set so that the interference with respect to the said other member in the said cyclic | annular protrusion part may become large gradually as it goes to the back from the front of the said sliding direction.

  Thereby, it is comprised so that the internal peripheral surface of the cyclic | annular protrusion part in a gasket may face the other member side, and the interference with respect to the other member in a cyclic | annular protrusion part goes to the back from the front of the said sliding direction. Combined with the fact that it is set so as to gradually increase, the annular projection can be deformed so that it can stably fall toward the outer circumference over its entire circumference in the mounted state. It becomes.

The gasket includes an annular protrusion extending from the main body of the gasket toward the other member and extending in a direction inclined with respect to a direction perpendicular to the opposing surfaces of the two members.
The outer peripheral surface of the annular protrusion is configured to face the other member side,
It is also preferable that a tightening margin for the other member in the annular protrusion is set to gradually decrease from the front to the rear in the sliding direction.

  Thereby, it is comprised so that the outer peripheral surface of the annular projection part in a gasket may face the other member side, and the interference with respect to the other member in an annular projection part is going from the front of the said sliding direction to back. Combined with the setting to gradually decrease, the annular protrusion can be deformed so that it can stably fall toward the inner periphery over its entire circumference in the mounted state. It becomes.

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,
When the two members are assembled, the gasket is configured to slide on the surface of the other member of the two members while being mounted in the annular groove,
The tightening allowance for the other member is set so as to gradually change from the front to the rear in the sliding direction when sliding on the surface of the other member.

  According to the present invention, the gasket can be slid and compressed by the two members from a portion having a large interference, and gradually slides and compresses toward a region having a small interference. Become. Therefore, the load accompanying the sliding resistance of the gasket in the process of assembling the two members can be suppressed. Further, since the gasket is sequentially slid and compressed according to the part, variation in compression deformation according to the part can be suppressed, and the posture of the gasket can be stabilized.

  The height in the direction perpendicular to the facing surfaces of the two members may be configured to gradually change from the front to the rear in the sliding direction.

  Thereby, the interference with respect to the said other member can be set so that it may change gradually as it goes to the back from the front of the sliding direction at the time of sliding on the surface of this other member.

An annular protrusion extending from the gasket body to the other member and extending in a direction inclined with respect to a direction perpendicular to the opposing surface of the two members;
The inner peripheral surface of the annular protrusion is configured to face the other member side,
It is good to set so that the interference with respect to the said other member in the said cyclic | annular protrusion part may become large gradually as it goes to the back from the front of the said sliding direction.

  Thereby, it is comprised so that the internal peripheral surface of the cyclic | annular protrusion part in a gasket may face the other member side, and the interference with respect to the other member in a cyclic | annular protrusion part goes to the back from the front of the said sliding direction. Combined with the fact that it is set so as to gradually increase, the annular projection can be deformed so that it can stably fall toward the outer circumference over its entire circumference in the mounted state. It becomes.

In addition, an annular protrusion extending from the main body of the gasket toward the other member and extending in a direction inclined with respect to a direction perpendicular to the opposing surface of the two members,
The outer peripheral surface of the annular protrusion is configured to face the other member side,
It is also preferable that a tightening margin for the other member in the annular protrusion is set to gradually decrease from the front to the rear in the sliding direction.

  Thereby, it is comprised so that the outer peripheral surface of the annular projection part in a gasket may face the other member side, and the interference with respect to the other member in an annular projection part is going from the front of the said sliding direction to back. Combined with the setting to gradually decrease, the annular protrusion can be deformed so that it can stably fall toward the inner periphery over its entire circumference in the mounted state. It becomes.

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

  As described above, according to the present invention, it is possible to stabilize the posture of the gasket and improve the sealing performance.

It is a top view of the gasket which concerns on Example 1 of this invention. It is sectional drawing of the gasket which concerns on Example 1 of this invention. It is a side view of a throttle body showing the state where the gasket concerning Example 1 of the present invention was attached to the throttle body. It is typical sectional drawing which shows the mode in the middle of an assembly in the sealing structure which concerns on Example 1 of this invention. It is typical sectional drawing which shows the mounting state of the gasket which concerns on Example 1 of this invention. It is explanatory drawing explaining the dimensional relationship of each part of the sealing structure which concerns on Example 1 of this invention. It is explanatory drawing explaining the dimensional relationship of each part of the sealing structure which concerns on Example 2 of this invention. It is typical sectional drawing of the sealing structure which concerns on Example 3 of this invention. It is typical sectional drawing of the sealing structure which concerns on Example 4 of this invention. FIG. 10 is a schematic cross-sectional view showing a process of assembling two members in a conventional sealing structure. FIG. 11 is a schematic cross-sectional view showing a sealing structure according to a 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 sealing structure and gasket which concern on Example 1 of this invention are demonstrated. In the present embodiment, in the assembled state, the throttle body 20 and the intake manifold 30 as two members having mutually opposing surfaces (planar surfaces in the present embodiment), and an annular groove 21 provided in the throttle body 20 A sealing structure including an annular gasket 10 that is attached to the throttle body 20 and seals a gap between opposing surfaces of the throttle body 20 and the intake manifold 30 will be described as an example.

<Gasket>
In particular, a gasket according to Example 1 of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a plan view of a gasket 10 according to this embodiment, and FIG. 2 is a cross-sectional view taken along line AA in FIG. The gasket 10 according to the present embodiment is composed of an annular member, and a positioning projection 11 is provided on the outer peripheral side.

  Further, the gasket 10 includes a first seal protrusion 12 that is in close contact with the intake manifold 30 and a pair of second seal protrusions 13 and 14 that are in close contact with the groove bottom of the annular groove 21 provided in the throttle body 20. Yes. The first seal protrusion 12 and the second seal protrusions 13 and 14 are continuously provided over the entire circumference of the gasket 10.

  Here, the angle of the tip of the first seal projection 12 is set to be 90 ° or more. Thereby, the fall of the first seal protrusion 12 is suppressed, and it is suppressed that the first seal protrusion 12 is caught in the minute gap between the opposing surfaces of the throttle body 20 and the intake manifold 30. Further, the side close to the groove bottom of the annular groove 21 is constituted by a pair of second seal protrusions 13 and 14 so as to reduce the repulsive force during compression. Furthermore, in the gasket 10 according to the present embodiment, the recess 15 is provided on the inner peripheral surface and the outer peripheral surface of the gasket body so as to reduce the filling rate in the annular groove 21 when compressed. Like to do.

<Sealing structure>
In particular, the sealing structure according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a side view of the throttle body 20 showing a state in which the gasket 10 is mounted on the throttle body 20. FIG. 4 is a schematic cross-sectional view of the sealing structure according to the present embodiment. FIG. 4 is a view for explaining the positional relationship of each member when the throttle body 20 is mounted on the intake manifold 30, and for convenience, each member is simplified or omitted. 3 corresponds to the view seen in the direction of arrow V in FIG. FIG. 5 is a schematic cross-sectional view showing a state of the gasket 10 when the throttle body 20 is mounted on the intake manifold 30.

  As described above, the sealing structure according to the present embodiment is mounted in the throttle body 20 and the intake manifold 30, and the annular groove 21 provided in the throttle body 20, and a gap between the opposing surfaces of the throttle body 20 and the intake manifold 30 is formed. And an annular gasket 10 for sealing.

  The throttle body 20 includes a slot valve 22. The throttle body 20 is configured to be mounted (assembled) by sliding (sliding in the direction of arrow S in FIG. 4) from the side surface side of the intake manifold 30 (side surface side of the intake passage 31).

That is, the intake manifold 30 is provided with a recess 32 into which a tip of the throttle body 20 is inserted in a part of the inner peripheral surface of the intake passage 31, and the throttle body 20 is inserted at a position facing the recess 32. An insertion hole 33 is provided. With this configuration, the throttle body 20 can be attached to the intake manifold 30 by inserting the throttle body 20 so as to penetrate the insertion hole 33 from the distal end side and inserting the distal end portion into the recess 32. .

  Here, the throttle body 20 is provided with annular grooves 21 on both surfaces thereof, and the gaskets 10 are respectively attached to the annular grooves 21. These gaskets 10 are mounted in advance in the respective annular grooves 21, and in this state, the throttle body 20 is mounted on the intake manifold 30 (in the direction of arrow S in FIG. 4). Further, in the present embodiment, as shown in FIG. 3, the gasket 11 is fitted so that the protrusion 11 provided on the outer peripheral side of the gasket 10 is fitted into the positioning recess 21a provided on the outer peripheral side surface of the annular groove 21. By mounting 10, positioning is performed with respect to the rotation direction.

  When the throttle body 20 is attached to the intake manifold 30, the gasket 10 includes a groove bottom surface (planar surface in this embodiment) of the annular groove 21 in the throttle body 20, and the intake manifold 30 as shown in FIG. 5. And a mounting surface 34 (a surface around the opening of the intake passage 31 (a plane in this embodiment)). Thereby, the gap between the opposing surfaces of the throttle body 20 and the intake manifold 30 is sealed.

  As described above, by providing the gaskets 10 on both surfaces of the throttle body 20, the intake gas passes through the insertion hole 33 provided in the intake manifold 30 from the intake passage 31 and leaks to the outside. It becomes possible to suppress.

  In the sealing structure according to the present embodiment, the first seal protrusion 12 of the gasket 10 slides with respect to the mounting surface 34 of the intake manifold 30 in the process of mounting the throttle body 20 to the intake manifold 30. In FIG. 1, the arrow T indicates the sliding direction of the gasket 10, and the arrow U indicates the direction in which the first seal protrusion 12 is dragged during sliding.

<Tightening allowance for the mounting surface of the intake manifold in the gasket>
With reference to FIG. 6, the tightening allowance for the mounting surface 34 of the intake manifold 30 in the gasket 10 will be described in detail.

  In this embodiment, the tightening margin for the mounting surface 34 in the gasket 10 (the first seal projection 12) is the sliding direction when the gasket 10 (the first seal projection 12) slides on the mounting surface 34. It is set to gradually increase from the front to the rear.

  6 is a diagram showing the dimensional relationship among the annular groove 21, the gasket 10, and the mounting surface 34. The left side in FIG. 6 shows the dimensional relationship in the front in the sliding direction (A in FIG. 4), and the right side in FIG. Shows the dimensional relationship behind the sliding direction (B in FIG. 4). In FIG. 6, the gasket 10 is shown in a simplified manner and is not compressed by the mounting surface 34. Further, with respect to the mounting surface 34, the position of the surface is indicated by a dotted line.

In the present embodiment, the groove depth of the annular groove 21 is configured to be the same over the entire circumference. The groove bottom of the annular groove 21 and the mounting surface 34 are parallel, that is, the distance between the groove bottom of the annular groove 21 and the mounting surface 34 is constant over the entire circumference of the annular groove 21. On the other hand, the gasket 10 is configured such that the height (H in FIG. 2) is higher at the rear height Hb than at the front height Hf in the sliding direction. Further, the height H of the gasket 10 is configured to gradually increase from the front to the rear in the sliding direction.

  By being configured in this manner, the tightening allowance for the mounting surface 34 in the gasket 10 is larger in the tightening allowance Xb in the rear than the tightening allowance Xf in the front in the sliding direction of the gasket. Further, the tightening margin gradually increases from the front to the rear in the sliding direction when the gasket 10 (the first seal projection 12) slides on the mounting surface 34.

<Excellent points of sealing structure and gasket according to this example>
According to the sealing structure according to the present embodiment, in the process of mounting the throttle body 20 to the intake manifold 30, the gasket 10 is slid with respect to the mounting surface 34 from the rear portion where the tightening margin is large and the groove of the annular groove 21. Compression by the bottom and the mounting surface 34 begins. Then, sliding and compression proceed gradually toward the front with a small tightening allowance. Accordingly, it is possible to suppress the load accompanying the sliding resistance of the gasket 10 in the process of mounting the throttle body 20 to the intake manifold 30.

  In addition, the gasket 10 (the first seal protrusion 12) starts to slide from a rear portion having a large tightening allowance. At this time, the part is dragged toward the outer peripheral side of the gasket 10. Accordingly, the portion is compressed and deformed so as to be inclined toward the outer peripheral side. As the mounting (insertion) of the throttle body 20 proceeds, the sliding portion of the gasket 10 (the first seal projection 12) gradually moves forward. In this case, since the part where the sliding has already started is deformed so as to incline toward the outer peripheral side, when the sliding part moves forward, the part where the sliding starts newly also moves to the outer peripheral side. It compresses and deforms so as to tilt.

  Thus, in the case of a present Example, the sliding site | part of the gasket 10 (the 1st seal | sticker projection part 12) transfers gradually. Therefore, when the gasket 10 is slid, it slides so as to be dragged to the inner peripheral side of the gasket 10 on the front side in the sliding direction, and is dragged to the outer peripheral side of the gasket 10 on the rear side in the sliding direction. Although it slides, the variation of the compression deformation according to the site | part can be suppressed compared with the case where the whole slides simultaneously. Therefore, the posture of the gasket 10 can be stabilized.

  In this embodiment, when the height H of the gasket 10 is about 6 mm, the height difference α of the fastening allowance, that is, Xb−Xf = Hb−Hf is 0.05 mm or more and 1.0 mm or less, more preferably It is good to set to 0.1 mm or more and 0.5 mm or less. If the height difference α is smaller than this range, the effect of the present embodiment as described above is small. If the height difference α is larger than this range, the circumferential sealing bias tends to occur.

  Here, in this embodiment, since the intake passage 31 has a negative pressure, a configuration is adopted in which the first seal protrusion 12 of the gasket 10 is deformed so as to be inclined toward the outer peripheral side. However, depending on the application, it may be desirable to deform the seal protrusion 12 of the gasket 10 so as to incline toward the inner peripheral side. In this case, the tightening margin with respect to the mounting surface 34 in the gasket 10 (the first seal projection 12) is in the sliding direction when the gasket 10 (the first seal projection 12) slides on the mounting surface 34. What is necessary is just to set so that it may become small gradually as it goes to the back from the front. That is, the height H of the gasket 10 may be configured to gradually decrease from the front to the rear in the sliding direction.

If such a structure is employ | adopted, the 1st seal | sticker projection part 12 of the gasket 10 will start sliding from the front site | part with a large interference | tightening allowance. At this time, the part is dragged toward the inner peripheral side of the gasket 10. Accordingly, the portion is compressed and deformed so as to be inclined toward the inner peripheral side. As the throttle body 20 is mounted (inserted), the gasket 1
The sliding portion of the zero first seal projection 12 gradually moves backward. In this case, since the part where the sliding has already started is deformed so as to incline toward the inner peripheral side, when the sliding part moves backward, the part where the sliding starts again is also the inner peripheral side. It is compressed and deformed so as to incline toward the side.

(Example 2)
FIG. 7 shows a second embodiment of the present invention. In the said Example 1, the case where a fastening allowance was changed with the change of the height of a gasket was shown. On the other hand, in a present Example, the structure in the case of changing a fastening margin with the change of the depth of the annular groove where a gasket is mounted | worn is shown. Since the basic configuration and operation are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  With reference to FIG. 7, the tightening allowance for the mounting surface 34 of the intake manifold 30 in the gasket 10a according to the second embodiment of the present invention will be described in detail. About the gasket 10a which concerns on a present Example, the fundamental structure is the same as that of the said Example 1, and it differs from the case of the said Example 1 only regarding the height of the gasket 10a.

  Also in the present embodiment, as in the case of the first embodiment, the tightening margin for the mounting surface 34 in the gasket 10a (the first seal projection portion) is the same as that of the gasket 10 (the first seal projection portion 12). 34 is set to gradually increase from the front to the rear in the sliding direction when sliding.

  7 is a diagram showing the dimensional relationship among the annular groove 21a of the throttle body, the gasket 10a, and the mounting surface 34. The left side in FIG. 7 shows the dimensional relationship in the front in the sliding direction, and the right side in FIG. The dimensional relationship in the rear of the direction is shown. In FIG. 7, the gasket 10 a is shown in a simplified manner and is not compressed by the mounting surface 34. The mounting surface 34 is indicated by a dotted line.

  In the present embodiment, the gasket 10a is configured to have the same height over the entire circumference. On the other hand, the depth of the annular groove 21a is configured such that the rear depth Db is shallower than the front depth Df in the sliding direction of the gasket 10a. Further, the depth of the annular groove 21a is configured to gradually become shallower from the front to the rear in the sliding direction.

  With this configuration, the fastening allowance for the mounting surface 34 in the gasket 10a is the fastening allowance Xb at the rear rather than the fastening allowance Xf at the front in the sliding direction of the gasket 10a, as in the first embodiment. Is bigger. In addition, the tightening margin gradually increases from the front to the rear in the sliding direction when the gasket 10a (the first seal protrusion) slides on the mounting surface 34.

  By adopting the above configuration, in the case of the present embodiment, the same effect as in the case of the first embodiment can be obtained. In the case of this embodiment, the first seal projection of the gasket 10a is deformed so as to be inclined toward the outer peripheral side. However, when it is desired to be deformed so as to be inclined toward the inner peripheral side, the annular groove 21a What is necessary is just to comprise so that a depth may become deep gradually as it goes to the back from the front of the said sliding direction.

  It is also possible to adopt a configuration in which the tightening allowance is gradually changed by changing both the height of the gasket and the depth of the annular groove.

(Example 3)
FIG. 8 shows a third embodiment of the present invention. In the present embodiment, in an assembled state, the intake manifold 50 and the cylinder block 60 as two members having mutually opposing surfaces (planar surfaces in the present embodiment) and an annular groove 51 provided in the intake manifold 50 are mounted. A sealing structure including an annular gasket 40 that seals the gap between the opposing surfaces of the intake manifold 50 and the cylinder block 60 will be described as an example.

  The gasket 40 according to the present embodiment includes a protrusion 41 that is in close contact with the groove bottom surface of the annular groove 51, and an annular protrusion 42 that is in close contact with the surface 61 of the cylinder block 60. The annular protrusion 42 extends from the main body of the gasket 40 toward the surface 61 of the cylinder block 60 and extends in a direction inclined with respect to a direction perpendicular to the opposed surfaces of the intake manifold 50 and the cylinder block 60. It is configured. More specifically, the annular protrusion 42 is configured to extend in a direction inclined toward the outer peripheral side. Further, the inner peripheral surface 43 of the annular protrusion 42 is configured to face the surface 61 side of the cylinder block 60.

  By adopting the above configuration, when the annular protrusion 42 is in close contact with the surface 61 of the cylinder block 60, the annular protrusion 42 is easily deformed so as to be inclined toward the outer peripheral side.

  In this embodiment, the annular protrusion 42 of the gasket 40 slides with respect to the surface 61 of the cylinder block 60 in the process of assembling the intake manifold 50 and the cylinder block 60. In FIG. 8, the arrow T indicates the sliding direction of the gasket 40, and the arrow K indicates the direction in which the annular protrusion 42 is dragged during sliding.

  Further, in this embodiment, the tightening allowance of the annular protrusion 42 of the gasket 40 with respect to the surface 61 of the cylinder block 60 is the front in the sliding direction T when the annular protrusion 42 of the gasket 40 slides on the surface 61. It is set to gradually increase from the rear to the rear.

  Regarding the setting of the tightening allowance, as shown in the first embodiment, the change in the height of the gasket 40 may be used, or as shown in the second embodiment, the depth of the annular groove 51 Change may be used, or both may be used.

  As described above, also in the case of the present embodiment, the same effects as those of the first and second embodiments can be obtained by changing the tightening allowance. Further, in the case of the present embodiment, the inner peripheral surface 43 of the annular protrusion 42 in the gasket 40 is configured to face the surface 61 side of the cylinder block 60, and the surface 61 of the annular protrusion 42 with respect to the surface 61. Combined with the fact that the tightening margin is set as described above, in the mounted state, the annular protrusion 42 is deformed so as to stably fall down toward the outer periphery over the entire circumference. Is possible.

Example 4
FIG. 9 shows a fourth embodiment of the present invention. In the present embodiment, in the same manner as in the third embodiment, in the assembled state, the intake manifold 50 and the cylinder block 60 as two members having mutually opposing surfaces (flat surfaces in the present embodiment), and the intake manifold 50 are provided. A sealing structure including an annular gasket 40a that is attached to the provided annular groove 51 and seals the gap between the opposing surfaces of the intake manifold 50 and the cylinder block 60 will be described as an example.

The gasket 40 a according to the present embodiment includes a protruding portion 41 a that is in close contact with the groove bottom surface of the annular groove 51 and an annular protruding portion 42 a that is in close contact with the surface 61 of the cylinder block 60. The annular protrusion 42a extends from the main body of the gasket 40a toward the surface 61 of the cylinder block 60 and extends in a direction inclined with respect to a direction perpendicular to the opposed surfaces of the intake manifold 50 and the cylinder block 60. It is configured. More specifically, the annular protrusion 42a is configured to extend in a direction inclined toward the inner peripheral side. In addition, the outer peripheral surface 43 a of the annular protrusion 42 a is configured to face the surface 61 side of the cylinder block 60.

  By adopting the above configuration, when the annular protrusion 42a is in close contact with the surface 61 of the cylinder block 60, the annular protrusion 42a is easily deformed so as to be inclined toward the inner peripheral side.

  In the present embodiment, in the process of assembling the intake manifold 50 and the cylinder block 60, the annular protrusion 42 a of the gasket 40 a slides with respect to the surface 61 of the cylinder block 60. In FIG. 9, the arrow T indicates the sliding direction of the gasket 40a, and the arrow K indicates the direction in which the annular protrusion 42a is dragged during sliding.

  In the present embodiment, the tightening allowance of the annular protrusion 42a of the gasket 40a with respect to the surface 61 of the cylinder block 60 is the front of the sliding direction T when the annular protrusion 42a of the gasket 40a slides on the surface 61. It is set so that it gradually decreases from the rear to the rear.

  Regarding the setting of the tightening allowance, a change in the height of the gasket 40a may be used as shown in the first embodiment, or the depth of the annular groove 51 may be used as shown in the second embodiment. Change may be used, or both may be used.

  As described above, also in the case of the present embodiment, the same effects as those of the first and second embodiments can be obtained by changing the tightening allowance. In the case of the present embodiment, the outer peripheral surface 43a of the annular protrusion 42a of the gasket 40a is configured to face the surface 61 side of the cylinder block 60, and the tightening of the annular protrusion 42a with respect to the surface 61 is performed. Combined with the fact that the margin is set as described above, in the mounted state, the annular protrusion 42a is deformed so as to stably fall down toward the inner periphery over its entire circumference. Is possible.

10, 10a Gasket 11 Protrusion 12 First seal protrusion 13, 14 Second seal protrusion 15 Recess 20 Throttle body 21 Annular groove 21a Recess 21a Annular groove 22 Slot valve 30 Intake manifold 31 Intake passage 32 Recess 33 Insertion hole 34 Mounting surface 40 Gasket 40a Gasket 41, 41a Protruding part 42, 42a Annular protuberance 43 Inner peripheral surface 43a Outer peripheral surface 50 Intake manifold 51 Annular groove 60 Cylinder block 61 Surface

Claims (9)

Two members having surfaces facing each other in an assembled state;
An annular gasket that is mounted in an annular groove provided in one of the two members and seals a gap between opposing surfaces of the two members;
With
When the two members are assembled, the gasket is mounted in the annular groove, and the sealing structure is configured such that the gasket slides on the surface of the other member of the two members. There,
The fastening margin for the other member of the gasket is set so as to gradually change from the front to the rear in the sliding direction when the gasket slides on the surface of the other member. Sealing structure.   The sealing structure according to claim 1, wherein the height of the gasket is configured to gradually change from the front to the rear in the sliding direction.   The sealing structure according to claim 1, wherein the depth of the mounting groove is configured to gradually change from the front to the rear in the sliding direction. The gasket includes an annular protrusion extending from the main body of the gasket toward the other member and extending in a direction inclined with respect to a direction perpendicular to the opposing surfaces of the two members,
The inner peripheral surface of the annular protrusion is configured to face the other member side,
2. The sealing structure according to claim 1, wherein a tightening margin for the other member in the annular protrusion is set to gradually increase from the front to the rear in the sliding direction. The gasket includes an annular protrusion extending from the main body of the gasket toward the other member and extending in a direction inclined with respect to a direction perpendicular to the opposing surfaces of the two members,
The outer peripheral surface of the annular protrusion is configured to face the other member side,
The sealing structure according to claim 1, wherein a tightening margin for the other member in the annular protrusion is set to gradually decrease from the front to the rear in the sliding direction. 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,
When the two members are assembled, the gasket is configured to slide on the surface of the other member of the two members while being mounted in the annular groove,
A gasket characterized in that a tightening margin for the other member is set so as to gradually change from the front to the rear in the sliding direction when sliding on the surface of the other member.   7. The gasket according to claim 6, wherein a height in a direction perpendicular to the opposing surfaces of the two members is configured to gradually change from the front to the rear in the sliding direction. An annular protrusion extending from the gasket body to the other member and extending in a direction inclined with respect to a direction perpendicular to the opposing surface of the two members;
The inner peripheral surface of the annular protrusion is configured to face the other member side,
The gasket according to claim 6, wherein a tightening margin for the other member in the annular protrusion is set to gradually increase from the front to the rear in the sliding direction. An annular projection extending from the main body of the gasket toward the other member and extending in a direction inclined with respect to a direction perpendicular to the opposing surfaces of the two members;
The outer peripheral surface of the annular protrusion is configured to face the other member side,
The gasket according to claim 6, wherein a tightening margin for the other member in the annular projecting portion is set to gradually decrease from the front to the rear in the sliding direction.

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