JP4243700B2 - gasket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gasket.
[0002]
[Prior art]
Conventionally, gaskets are used for the purpose of preventing leakage of fluid (air, etc.) from the outside. When the gap between the two members is sealed with a gasket, a mounting groove is provided in one member, the gasket is mounted in the mounting groove, and the groove bottom of the mounting groove and the surface of the other member are mounted. The gasket is sealed by adhering.
[0003]
The gasket is made of a rubber-like elastic body whose cross section has a shape such as a convex shape, a rhombus shape, an elliptical shape, or a combination of irregularities.
[0004]
And the other member to which a gasket adheres may be comprised with resin. In a member molded with resin, swell, creep, etc. may occur, strength may be insufficient, and accurate flatness may be difficult to obtain. In such cases, the compression direction in which the gasket is compressed Variation in size and variation in compressive force for compressing the gasket occur. In order to absorb such a variation and exhibit the sealing function, it is necessary to provide a gasket longer than the depth of the groove so that a crushing margin is increased. Furthermore, in a member or device provided with a gasket, when the groove width of the mounting groove is narrowly provided for miniaturization and space saving, the cross-sectional shape of the gasket is elongated.
[0005]
However, when the gasket has a long and narrow cross section, there is a problem that collapse occurs during compression. On the other hand, for example, in Patent Document 1, the fall is prevented by providing the fall prevention protrusions at predetermined intervals on the gasket side surface.
[0006]
[Patent Document 1]
Japanese Patent No. 3310547 [0007]
[Problems to be solved by the invention]
By the way, in the assembly between the two members, the other member may be assembled relatively obliquely with respect to the gasket mounted in the mounting groove of one member.
[0008]
In this case, the compression force is applied to the gasket from an oblique direction, which makes it easier to fall down.Furthermore, the lid slides on the gasket, so that it does not just fall down and the gasket cross section rotates. It happens until. In the gasket as described in Patent Document 1, the fall prevention protrusions provided on both sides of the gasket body are effective in preventing the fall caused by the compressive force applied from the vertical direction by the lid, but the lid is inclined from the oblique direction. If it is assembled, it will be counterproductive. The reason is that when the gasket is compressed in an oblique direction, it is pressed against one of the groove sidewalls, but it is the protrusion that prevents the body from contacting the groove sidewall directly, so the lid slides against the gasket. In such a case, the stability is deteriorated and the projection is rotated as a fulcrum.
[0009]
The present invention has been made to solve the above-mentioned problems of the prior art, and the object of the present invention is to rotate a gasket in a gasket that seals a gap between two members assembled in a relatively oblique direction. Accordingly, it is an object of the present invention to provide a gasket in which the sealing performance is stabilized.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following means.
[0011]
In the gasket of the present invention, after mounting the gasket in the mounting groove formed on the surface of one of the two members having the surfaces facing each other, the surfaces of the two members are oblique to the facing direction. This is applied when two members are assembled close to each other (relatively moved). By providing a protrusion at a predetermined position of the gasket mounted in the mounting groove, rotation is prevented during assembly. Thus, the sealing performance is stabilized.
[0012]
In the case of assembling the two members, it is preferable that the two members are assembled in a relatively oblique direction without the corners of the other member contacting the gasket.
[0013]
The predetermined position is the vicinity of the region of the gasket body that is substantially perpendicular to the other member moving direction in which the other member moves relative to the one member, and that is upstream of the other member moving direction. That means. Further, in the vicinity of a region where the surface in contact with the gasket main body and the surface substantially perpendicular to the other member moving direction in which the other member moves relative to the one member substantially coincides, and upstream of the other member moving direction. It can also be called the side. The gasket main body has a side surface substantially parallel to the groove side wall of the mounting groove facing the downstream side in the moving direction of the other member at a predetermined position (region where the protrusion is provided). Here, the predetermined position includes a region where the compressive force in the direction of movement of the other member that occurs when the two members are assembled acts most on the gasket to rotate the gasket.
[0014]
The protrusion provided at the predetermined position is provided so as to be in close contact with the groove side wall on the upstream side in the movement direction of the other member of the mounting groove when the gasket starts to be compressed when the two members are assembled. In addition, when the two members are assembled, the side surface of the gasket on the downstream side in the movement direction of the other member in the region where the protrusion is provided is pressed against the groove side wall on the downstream side in the movement direction of the other member and closely contacts the groove side wall. preferable. Here, when the gasket starts to be compressed when the two members are assembled, the protrusion closely contacts the groove side wall on the upstream side in the other member moving direction of the mounting groove, and the downstream side of the other member moving direction in the region where the protrusion is provided. It is preferable that the side surface of the gasket on the side is in close contact with the groove sidewall on the downstream side in the movement direction of the other member of the mounting groove. Further, in a state where the gasket is only mounted in the mounting groove before the two members are assembled, the protrusion and the side surface may or may not be in contact with the groove side wall.
[0015]
Specifically, the present invention is mounted in a mounting groove formed on the surface of one member of two members having surfaces facing each other, and the surfaces of the two members are oblique to the facing direction. A gasket that is compressed by being attached to the two members and sealing a gap between the two members,
Of the gasket body, wherein a region near substantially orthogonal to the other member moving direction in which the other member moves relative to one member said of the two members, on the upstream side of the other lateral member movement direction, When the gasket starts to be compressed when the two members are assembled, a protrusion is provided in close contact with the groove side wall on the upstream side in the other member movement direction of the mounting groove , and the region where the protrusion is provided and the downstream side in the other member movement direction In the above, a side surface substantially parallel to the groove side wall of the mounting groove facing each other is provided.
[0016]
When the surfaces of the two members approach each other in an oblique direction with respect to the opposing direction and the two members are assembled, a compressive force is applied to the gasket from the oblique direction (the other member moving direction), and the other member is Since the sliding action also works, the gasket tends to roll in the direction of the compression force applied to the gasket in the mounting groove (the other member movement direction) (in the gasket region located at the groove bottom of the mounting groove). The other member moving direction upstream). In this case, the gasket has a side surface substantially parallel to the groove side wall of the mounting groove facing the groove (the groove side wall on the downstream side in the other member movement direction of the mounting groove) on the downstream side in the other member movement direction. The side surface is pressed against the groove side wall by the applied force and comes into close contact (surface contact) with the groove side wall, whereby the gasket can be stabilized in the groove and the rotation of the gasket can be prevented. Furthermore, since the protrusion provided on the gasket is in close contact with the groove side wall on the upstream side in the movement direction of the other member of the mounting groove since the gasket starts to be compressed when the two members are assembled, the gasket can be made more stable. Can be prevented from rotating. Accordingly, it is possible to stabilize the sealing performance.
[0017]
In the above configuration, it is preferable that the gasket has a substantially pentagonal cross section. It protrudes to the other member side, and the tip is determined by two slopes forming a cross-sectional chevron shape having a R-shaped cross section (tip and the end of each slope), and the groove bottom of the mounting groove. It means a pentagonal cross-sectional shape constituted by two points (ends of the groove bottom) determined by the bottom surface in contact.
[0018]
Then, the two members are assembled so that the tips of the two inclined surfaces of the gasket are in contact with only the contact surface of the other member. At this time, of the two inclined surfaces of the gasket, the corner on the downstream side in the direction in which the other member moves relative to the one member and constituting a substantially pentagonal cross section, and the corner The side surface between the bottom surface and the bottom surface is provided so as to be in close contact with the groove side wall of the mounting groove facing the corner portion.
[0019]
As described above, since the tips of the two inclined surfaces of the gasket are formed in an R shape, the surface pressure that the gasket receives from the close contact surface of the other member in the process of assembling one member to the other member. Can be made substantially uniform without being influenced by the contact angle with the close contact surface.
[0020]
When the two members are assembled, the gasket receives a force in the direction in which the other member moves relative to one member, but the other member of the two inclined surfaces of the gasket moves relatively. And the side surface between the corner and the bottom surface is in close contact with the groove side wall of the mounting groove (particularly, the side surface is in surface contact with the groove side wall), and the bottom surface of the gasket is Since the surface contact is made with the groove bottom of the mounting groove, the rotation of the gasket can be more effectively prevented.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.
[0022]
The gasket according to the present embodiment is mounted in a mounting groove formed on the surface of one of the two members having surfaces facing each other, and the surfaces of the two members are oblique to the facing direction. It is a gasket which is compressed when the two members are assembled close to each other and seals the gap between the two members.
[0023]
Such a gasket is applied, for example, between an intake manifold of an internal combustion engine such as an automobile and a throttle body, and is preferably applied when the cross-sectional shape of the throttle body is a substantially trapezoidal shape. In the present embodiment, a throttle body (corresponding to one member) and an intake manifold (corresponding to the other member) will be exemplified and described as the two members.
[0024]
FIG. 1 is a schematic cross-sectional view for explaining the assembly of the throttle body 20 and the intake manifold 30 in which the mounting groove 21 in which the gasket 1 according to the present embodiment is mounted is formed. ) Is a diagram showing a state before assembly, and FIG. 5B is a diagram showing a state after assembly. FIG. 2 is a schematic front view of the main part of the throttle body 20 for showing the mounting groove 21 formed in the throttle body 20. The AA cross section shown in FIG. 2 corresponds to the throttle body 20 shown in FIG. FIG. 3 is a schematic cross-sectional view showing the gasket 1 according to the embodiment of the present invention, in which the gasket 1 is mounted in a mounting groove 21 formed in the throttle body 20 and the throttle body 20 and the intake manifold. 30 shows a state before 30 is assembled. FIG. 3 is a diagram corresponding to the G portion shown in FIG. FIG. 4 is a schematic top view of the gasket 1 as viewed from the intake manifold 30 side. FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 4, and shows protrusions 10 provided on both sides of the gasket 1. FIG. 6 is a schematic cross-sectional view showing a state where the throttle body 20 and the intake manifold 30 are assembled in a state where the gasket 1 is mounted in the mounting groove 21.
[0025]
The gasket 1 according to the present embodiment is mounted in a mounting groove 21 formed in the throttle body 20, and a sealing surface is formed on the mounting groove 21 and a close contact surface 31 facing the mounting groove 21 of the intake manifold 30. By doing so, the gap between the throttle body 20 and the intake manifold 30 is sealed.
[0026]
The throttle body 20 and the intake manifold 30 are assembled in such a manner that the surface of the throttle body 20 in which the mounting groove 21 is formed and the close contact surface 31 of the intake manifold 30 move relatively obliquely, that is, In this case, the opposing surfaces of the throttle body 20 and the intake manifold 30 approach each other in an oblique direction with respect to the opposing direction.
[0027]
Here, as shown in FIG. 3, in the state before assembly, the side where the intake manifold 30 is located with respect to the throttle body 20 is A, and the side where the throttle body 20 is located with respect to the intake manifold 30 is B. To do. In the present embodiment, the case where the throttle body 20 is fitted (assembled) into an intake manifold 30 attached to the internal combustion engine will be described. In this case, the throttle body 20 is B with respect to the intake manifold 30. Will move in the direction of arrow D from the side to the A side. For example, when the throttle body 20 and the intake manifold 30 are assembled as a single unit, the throttle body 20 and the intake manifold 30 move relatively obliquely. From the viewpoint of intake, the intake manifold 30 moves in the direction of arrow C from the A side to the B side. Here, the arrow C direction corresponds to the other member moving direction.
[0028]
The mounting groove 21 formed in the throttle body 20 includes a groove bottom 22, a B side groove side wall 23, and an A side groove side wall 24.
[0029]
The gasket 1 according to the present embodiment is composed of a rubber-like elastic body and has a substantially pentagonal cross section.
[0030]
That is, the gasket 1 includes a bottom surface 2 that abuts the groove bottom 22, a side wall (side surface) 3 that faces the groove side wall 23 and is substantially parallel to the groove side wall 23, a side wall 4 that faces the groove side wall 24, and an intake Opposite the manifold 30, there are provided inclined surfaces 5 and 6 having a substantially chevron-shaped cross section so as to form a tip 8 having a substantially pentagonal cross section. The tip 8 is formed in an R shape (curved shape) chamfered between the inclined surfaces 5 and 6.
[0031]
When a force in the direction of arrow C is applied to the gasket 1 mounted in the mounting groove 21, that is, when the throttle body 20 and the intake manifold 30 are assembled, the angle between the side wall 3 and the inclined surface 5 is increased. The portion 7 is provided so as to be in close contact with the groove side wall 23 on the downstream side in the arrow C direction in which the intake manifold 30 moves relatively, and the side wall 3 is provided so as to be in surface contact with the groove side wall 23. Yes.
[0032]
As shown in FIGS. 4 and 5, protrusions 10 are provided at predetermined intervals on both sides of the gasket 1, that is, in regions facing the respective groove side walls when mounted in the mounting groove 21.
[0033]
Furthermore, in the present embodiment, a surface that contacts the gasket 1 main body and a direction in which the intake manifold 30 moves relative to the throttle body 20, that is, a surface that is substantially orthogonal to the direction of arrow C shown in FIGS. When the gasket starts to be compressed when the throttle body 20 and the intake manifold 30 are assembled only in the vicinity of the region of the gasket 1 main body that is substantially coincident and upstream only in the direction of arrow C, the upstream side of the mounting groove 21 in the direction of arrow C A protrusion 9 is provided in contact with the groove side wall 24.
[0034]
When the intake manifold 30 is fitted into the protrusion 9, a compressive force in the direction of arrow C (force (frictional force) generated by sliding the intake manifold 30 and the gasket 1) acts on the gasket 1 when the intake manifold 30 is fitted. This is for preventing the gasket 1 from rotating in the direction of arrow E shown in FIG.
[0035]
The protrusion 9 is provided in a region where the compressive force in the direction of the arrow C generated by fitting the intake manifold 30 acts most on the gasket 1 so as to rotate the gasket 1. Further, the side wall 3 on the downstream side in the direction of arrow C is provided substantially parallel to the groove side wall 23 in a region where the compressive force in the direction of arrow C most acts on the gasket 1 so as to rotate the gasket 1.
[0036]
Below, the assembly method of the gasket 1 is demonstrated.
[0037]
First, the gasket 1 is mounted in the mounting groove 21 of the throttle body 20 so that the bottom surface 2 of the gasket 1 contacts the groove bottom 22 of the throttle body 20.
[0038]
Then, the throttle body 20 is moved in the direction of arrow D from the B side with respect to the intake manifold 30 (see FIGS. 1 and 3).
[0039]
At this time, the throttle body 20 is moved so that the corner 32 of the intake manifold 30 does not contact the gasket 1, and the throttle body 20 is fitted into the intake manifold 30. That is, the throttle body 20 is moved so that the close contact surface 31 of the intake manifold 30 contacts the front end 8 of the gasket 1 mounted on the throttle body 20, and the front end 8 contacts the close contact surface 31. Then, after the tip 8 contacts the close contact surface 31, the throttle body 20 is moved while sliding the tip 8 on the close contact surface 31 so as to keep the contact state, and the throttle body 20 is fitted into the intake manifold 30. Go. Thereby, the air flow path of the intake manifold 30 through the throttle body 20 shown by the arrow F in FIG.
[0040]
By assembling the gasket 1 in this manner, the corner portion 32 of the intake manifold 30 does not come into contact with the gasket 1, so that it is possible to prevent the collapse and twist that occur in the gasket 1 due to interference with the corner portion 32. it can.
[0041]
Further, since the tip 8 is chamfered and formed in an R shape, the surface pressure that the gasket 1 receives from the close contact surface 31 of the intake manifold 30 during the process of fitting the throttle body 20 into the intake manifold 30 is the gasket 1. And substantially uniform without being influenced by the contact angle between the contact surface 31 and the contact surface 31.
[0042]
Further, the gasket 1 mounted in the mounting groove 21 receives a force compressed in the arrow C direction when the throttle body 20 is fitted into the intake manifold 30.
[0043]
Thereby, the gasket 1 receives a force such that the side wall 3 falls toward the groove side wall 23 of the mounting groove 21, but as shown in FIG. 6, the side wall 3 comes into surface contact with the groove side wall 23. When the corner 7 between the inclined surface 5 and the inclined wall 5 is in close contact with the groove side wall 23, it is possible to prevent the gasket 1 from falling or rotating. Further, the bottom surface 2 is in surface contact with the groove bottom 22 and the gasket 1 receives a force compressed in the direction of arrow C, whereby the bottom surface 2 comes into close contact with the groove bottom 22 and the gasket 1 rotates. This can be prevented.
[0044]
Furthermore, since the protrusion 9 is provided in a region where the compressive force in the direction of the arrow C generated by fitting the intake manifold 30 is most acted on the gasket 1 to rotate the gasket 1, such compressive force is In the case of action, the gasket 1 can be more effectively prevented from rotating by being in close contact with the groove sidewall 24.
[0045]
Moreover, since the protrusions 10 are provided at predetermined intervals along the circumferential direction of the gasket 1 main body, it is possible to more effectively prevent the collapse that occurs in the gasket 1.
[0046]
Further, since the tip 8 is constituted by the inclined surfaces 5 and 6 having a mountain-shaped cross section, even when the tip 8 is slidably brought into close contact with the close contact surface 31, it is difficult to cause twisting.
[0047]
Further, in the process in which the throttle body 20 is fitted into the intake manifold 30 while the tip 8 is in sliding contact with the close contact surface 31, the gasket 1 (particularly, the portion where the inclined surfaces 5 and 6 are formed) is largely twisted. Since the side wall 3 and the corner 7 are in close contact with the groove side wall 23 and the bottom surface 2 is in close contact with the groove bottom 22, it is possible to prevent the gasket 1 from falling down and rotating. It is possible to prevent the portion where the inclined surfaces 5 and 6 are formed from getting caught between the throttle body 20 and the intake manifold 30.
[0048]
In the present embodiment, the mounting groove 21 is formed in a tapered shape for efficiency of workability when the gasket is mounted, and the portion provided in the mounting groove of the gasket 1 substantially follows the mounting groove 21. It has a different shape. However, the present invention is not limited to this. For example, as shown in FIG. 7, the mounting groove 21 may have a substantially rectangular cross section, and the portion provided in the mounting groove of the gasket 1 also has a substantially rectangular cross section substantially following the mounting groove. It is good also as a shape.
[0049]
In the present embodiment, the cross-sectional shape of the gasket 1 body is substantially pentagonal. However, the present invention is not limited to this, and the compressive force in the direction of arrow C generated by fitting the intake manifold 30 rotates the gasket. It is only necessary that the projections be provided in the region most acting on the gasket.
[0050]
【The invention's effect】
As described above, according to the present invention, the gasket can be prevented from rotating, and the sealing performance can be stabilized.
[Brief description of the drawings]
FIG. 1 is a view for explaining assembly of a throttle body and an intake manifold formed with a mounting groove in which a gasket according to an embodiment of the present invention is mounted.
FIG. 2 is a view for explaining a mounting groove formed in a throttle body.
FIG. 3 is a schematic cross-sectional view showing a gasket according to an embodiment of the present invention.
FIG. 4 is a schematic top view of a gasket according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view taken along the line BB of FIG.
FIG. 6 is a schematic cross-sectional view showing a state where the throttle body and the intake manifold are assembled in a state where the gasket according to the embodiment of the present invention is mounted in the mounting groove.
FIG. 7 is a schematic cross-sectional view showing a form in which the cross-sectional shape of the mounting groove and the cross-sectional shape of the portion in the mounting groove of the gasket are different.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gasket 2 Bottom face 3, 4 Side wall 5, 6 Inclined surface 7 Corner | angular part 8 Tip 9 Protrusion 10 Protrusion 20 Throttle body 21 Mounting groove 22 Groove bottom 23, 24 Groove side wall 30 Intake manifold 31 Close contact surface 32 Corner part

Claims (2)

Of the two members having opposite surfaces, the two members are assembled in a mounting groove formed on the surface of one member, and the surfaces of the two members approach each other in an oblique direction with respect to the opposing direction. A gasket that is compressed by being attached to seal a gap between the two members,
Of the gasket body, wherein a region near substantially orthogonal to the other member moving direction in which the other member moves relative to one member said of the two members, on the upstream side of the other lateral member movement direction, When the gasket starts to be compressed when the two members are assembled, a protrusion is provided in close contact with the groove side wall on the upstream side in the other member movement direction of the mounting groove , and the region where the protrusion is provided and the downstream side in the other member movement direction A gasket comprising a side surface substantially parallel to a groove side wall of the mounting groove facing each other . The gasket main body has two slopes that project to the other member of the two members and that form a cross-sectional chevron shape whose tip has a cross-sectional R shape, and a bottom surface that is in surface contact with the groove bottom of the mounting groove. The gasket according to claim 1, wherein the gasket has a substantially pentagonal cross section.

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