JP2012072882A - Gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasket capable of restricting an excessive rise of a filling ratio while maintaining effects for restricting fall-off and fall-down.SOLUTION: The gasket 1 installed in a groove formed at one of two members and tightly fitted to surfaces of a groove bottom surface of the groove and a surface of the other member to seal a clearance between them includes: a gasket body 10 tightly fitted to the surfaces of the groove bottom surface and the other member; and projections 12 formed at a side surface of the gasket body 10 so as to abut on the side surface of the groove. The projection 12 is formed to obliquely extend relative to a direction P in which the gasket body 10 is compressed by the groove bottom surface and the surface of the other member.

Description

  The present invention relates to a gasket.

  A gasket for sealing a gap between two members such as a cylinder head and a cylinder head cover of an automobile engine is generally used by being mounted in a groove provided in one member. The gasket is in close contact with the groove bottom surface and the other member surface by the repulsive force generated by being compressed by the two members, and seals the gap.

  In the gasket used as described above, a protrusion may be provided on the side surface of the gasket body in order to prevent dropping from the groove, falling in the groove, buckling, or the like (see, for example, Patent Document 1). . With reference to FIG. 5, the gasket which concerns on a prior art example is demonstrated. 5A and 5B are schematic views showing a configuration of a gasket according to a conventional example, in which FIG. 5A is a side view of the gasket, FIG. 5B is an EE sectional view of FIG. It is.

  The gasket 100 includes a gasket main body 101 and a protrusion 102 provided on a side surface of the gasket main body 101. The gasket 100 seals the gap between the two members by compressing the gasket main body 101 between the groove bottom surface of the groove provided in one member and the other member surface. A protruding portion 101 a is provided along the longitudinal direction of the gasket 100 at a portion of the gasket main body 101 that contacts the other member surface. The overhanging portion 101a is configured to be sandwiched between the surface of one member and the surface of the other member around the groove opening. The protrusion 102 prevents the gasket 100 from falling off or falling down by contacting the side surface of the groove.

  As described above, the gasket 100 including the protrusions 102 has a locally high filling rate (the size of the gasket cross section relative to the cross section of the mounting space in the cross section along the compression direction) in the portion where the protrusions 102 are provided. Suppressing effects such as falling off and falling are obtained. However, the filling rate may become higher than the designed value due to the influence of the groove processing accuracy, the molding accuracy of the gasket 100 (protrusion 102), the heat of the groove and deformation due to aging. If the filling rate becomes too high, the gasket 100 may stick to the groove at that location.

  Various problems arise because the protrusions 102 are fixed in the grooves. For example, it may not be possible to follow the dimensional variation of the mounting space due to the influence of processing accuracy or the influence of groove deformation, and the crushing allowance as designed may not be obtained. Further, for example, when the other member is deformed due to the influence of heat, the gasket 100 is lifted in accordance with the deformation of the other member, and the contact state with the surface of the other member cannot be maintained. And a gap between the other member may occur.

  In the gasket 100 provided with the overhanging portion 101a, the protrusion 102 has a shape extending perpendicularly to the overhanging portion 101a (the direction in which the gasket main body portion 101 is compressed) from the viewpoint of releasability. For this reason, there is a large change in the filling rate between the place where the protrusions 102 are provided (FIG. 5B) and the place where the protrusions 102 are not provided (FIG. 5C). Susceptible to displacement.

JP 2008-249096 A

  The present invention has been made in order to solve the above-described problems of the prior art, and the object of the present invention is to prevent the filling rate from becoming excessively high while maintaining the suppression effect such as dropping or falling. It is in providing the gasket which can do.

In order to achieve the above object, the gasket of the present invention comprises:
A gasket that is mounted in a groove provided in one of the two members, is in close contact with the groove bottom surface of the groove and the surface of the other member, and seals the gap between the two members,
A gasket main body closely contacting the groove bottom surface and the surface of the other member;
A protrusion provided on a side surface of the gasket main body and contacting the side surface of the groove;
In a gasket with
The protrusion is provided so as to extend obliquely with respect to a direction in which the gasket main body is compressed by the groove bottom surface and the surface of the other member.

  According to the present invention, the protrusions are provided so as to extend obliquely with respect to the compression direction of the gasket main body, thereby suppressing the filling rate from becoming too high while maintaining the effect of suppressing dropping or falling. can do.

  In contrast to the conventional configuration in which the protrusions are provided along the compression direction of the gasket main body portion, the filling rate can be reduced as compared with the conventional case by providing the protrusions obliquely with respect to the compression direction. That is, in the cross section in the compression direction of the gasket, the change in the filling rate between the place where the protrusions are provided and the place where the protrusions are not provided can be made smaller than before. Therefore, the influence when the dimensional relationship between the gasket and the groove deviates from the design value due to the influence of the groove processing accuracy, the molding accuracy of the gasket (projection), the heat of the groove and the deformation due to aging can be reduced.

  Moreover, in the case of the projection shape along the conventional compression direction, a compression force is applied to the projection in the direction in which the projection extends. The protrusion has a high shape stability against the force acting in the extending direction and hardly deforms. For this reason, deformation that releases the compressive force is unlikely to occur, and the adhesion is increased. On the other hand, when a force acts obliquely with respect to the direction in which the protrusion extends as in the present invention, a force is also applied in the direction in which the protrusion falls (direction perpendicular to the direction in which the protrusion extends), and the protrusion is likely to be deformed. . Thereby, it is possible to prevent the protrusion from being deformed so as to release the compressive force, and the contact force from becoming too high.

  In order to position the gasket body portion at the center of the groove, the protrusions may be provided in pairs on both side surfaces of the gasket body portion. In addition, a plurality of the protrusions may be provided in the longitudinal direction of the gasket main body so that an effect of suppressing dropping or falling can be obtained in the entire gasket.

  Even in such a configuration, the same effect as described above can be obtained.

  According to this invention, it can suppress that a filling rate becomes high too much, maintaining the inhibitory effect, such as drop-off and a fall.

The schematic diagram which shows a part of side surface of the gasket which concerns on the Example of this invention. The typical sectional view of the gasket concerning the example of the present invention. The typical sectional view of the gasket concerning the example of the present invention. The schematic diagram explaining the difference in the force which acts on protrusion. The schematic diagram which shows the structure of the gasket which concerns on a prior art 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)
The gasket which concerns on the Example of this invention with reference to FIGS. 1-4 is demonstrated. FIG. 1 is a schematic diagram illustrating a part of a side surface of a gasket according to the present embodiment. 2A and 2B are schematic cross-sectional views of the gasket according to the present embodiment, in which FIG. 2A is a cross-sectional view taken along the line AA in FIG. 1, FIG. ) Shows the DD cross section of FIG. FIG. 3 is a schematic cross-sectional view in a state where the gasket 1 according to the present embodiment is mounted in the groove 20, and shows a state before being compressed by one member 2 and the other member 3. 4A and 4B are schematic diagrams for explaining the difference in force acting on the protrusion, where FIG. 4A shows the force acting on the protrusion of the conventional example, and FIG. 4B shows the force acting on the protrusion of this embodiment.

  The gasket 1 according to the present embodiment is used for various devices such as automobile parts and industrial equipment. Specifically, it is used for various applications such as inlet manifolds, filter blankets, cylinder head covers, cam covers, timing belt covers, and fuel cell separators.

<Schematic configuration of gasket>
The gasket 1 is composed of a rubber-like elastic body. Examples of the rubber-like elastic material include rubber materials such as acrylic rubber, nitrile rubber, and fluorine rubber, and thermoplastic elastomers.

  As shown in FIGS. 1 and 2, the gasket 1 includes a gasket main body 10 and a pair of protrusions 12 that are integrally provided on both side surfaces of the gasket main body 10. In FIG. 1, only a linear part of the gasket 1 is shown. The overall shape of the gasket 1 is a shape corresponding to a location where it is used, and is generally an endless shape having no end portion.

  As shown in FIG. 3, the gasket 1 is mounted in a groove 20 provided in one member 2 (for example, a cam cover), and a groove bottom surface 21 of the groove 20 and a surface 31 of the other member 3 (for example, a housing). The gap between one member 2 and the other member 3 is sealed.

<Gasket body>
The gasket main body 10 is compressed in the vertical direction in the figure by the groove bottom surface 21 of the groove 20 and the surface 31 of the other member 3. The gasket main body portion 10 is brought into close contact with the groove bottom surface 21 of the groove 20 and the surface 31 of the other member 3 by the repulsive force generated by being compressed by the two members, and exhibits a sealing property.

As shown in FIG.2 and FIG.3, the contact site | part with the groove bottom face 21 of the groove | channel 20 in the gasket main-body part 10 is the edge part 10b which has a tapered cross-sectional shape. Further, the contact portion of the gasket main body 10 with the surface 31 of the other member 3 is an overhanging portion 10 a configured to protrude from the opening of the groove 20.

  The overhanging portion 10 a is configured to be sandwiched between the surface 23 of one member 2 and the surface 31 of the other member 3. Further, the overhanging portion 10 a includes seal protrusions 11 a and 11 b on the contact surface with the surface 31 of the other member 3. The seal protrusions 11a and 11b are configured such that the amount of protrusion of the seal protrusion 11a provided substantially at the center of the projecting portion 10a is larger than that of the seal protrusion 11b provided on both sides thereof.

  The gasket main body 10 is set such that the width dimension of the cross section is narrower than the width of the groove 20. On the other hand, the height dimension of the cross section of the gasket body 10 is such that the depth of the groove 20 is compressed so that a desired surface pressure is obtained with respect to the groove bottom surface 21 of the groove 20 and the surface 31 of the other member 3. It is set to be larger than this. Therefore, generally, the gasket body 10 is configured to have a vertically long cross-sectional shape.

  Since the gasket body portion 10 has a vertically long cross-sectional shape as described above, if the gasket 1 is composed of only the gasket body portion 10, the gasket body portion 10 may fall down or sit in the groove 20 when compressed by two members. There is a risk that the wearing state will become unstable. Therefore, the protrusion 12 is provided on the side surface of the gasket main body 10, and the protrusion 12 abuts on the side surface 22 of the groove 20 to prevent the gasket main body portion 10 from falling.

<Protrusions>
The protrusions 12 are provided in pairs on both side surfaces of the gasket body 10 in order to position the gasket body 10 in the center of the groove 20 with good balance. In addition, a plurality of pairs of the protrusions 12 are provided in the longitudinal direction of the gasket 1 so that the entire gasket can have an effect of suppressing dropping or falling.

  As shown in FIG. 1, the protrusion 12 extends from the lower end surface of the overhanging portion 10 a obliquely with respect to the compression direction (arrow P in the figure) by the two members, and under the overhanging portion 10 a. It is provided integrally on the end face. The angle of the direction in which the protrusion 12 extends with respect to the compression direction is appropriately set from the viewpoint of releasability at the time of manufacturing the gasket.

<Excellent points of this embodiment>
According to the present invention, the filling rate with respect to the mounting space is reduced as compared with the conventional gasket, and the filling rate can be suppressed from becoming excessively large.

  As shown in FIGS. 2 (A) to 2 (D), the gasket 1 according to the present embodiment has a cross-sectional shape in the compression direction of the conventional gasket 100 ( 5B and FIG. 5C) have a different shape.

  Assuming that the protrusion 12 of the gasket 1 according to this embodiment and the protrusion 102 of the gasket 100 according to the conventional example have the same width and height, the gasket 1 according to this embodiment is shown in FIG. The cross-sectional area becomes the largest in the cross-sectional shape shown in FIG.

  Further, the range in which the gasket exhibits the maximum cross-sectional area in the longitudinal direction of the gasket is a slight range including the cross section shown in FIG. 2B in the gasket 1 according to the present embodiment, whereas the conventional gasket. 100 is configured to exhibit the maximum cross-sectional area within the full width of the protrusion 102.

Thus, according to the present embodiment, the cross-sectional area (that is, the filling rate with respect to the mounting space) is reduced compared to the conventional gasket in which the protrusions are provided along the compression direction of the gasket main body. it can. That is, in the cross section in the compression direction of the gasket, the change in the filling rate between the place where the protrusions are provided and the place where the protrusions are not provided can be made smaller than before. As a result, the effect when the dimensional relationship between the gasket and the groove deviates from the design value due to groove processing accuracy, gasket (projection) molding accuracy, groove heat and deformation due to aging, etc. Can be reduced.

  Further, according to the present embodiment, the force acting on the protrusion when the gasket is mounted in the groove or when the gasket is compressed with two members is different from the conventional gasket, and the protrusion is in close contact with the groove side surface. The force is suppressed, and sticking of the gasket to the groove can be suppressed.

  As shown in FIG. 4A, in the case of the protrusion shape along the conventional compression direction, a force (arrow in the figure) is applied to the protrusion 102 in the direction in which the protrusion 102 extends. In this way, the vertically extending protrusion has a high shape stability against the force acting in the extending direction and is not easily deformed. Therefore, the protrusion 102 of the conventional gasket 100 is unlikely to be deformed so as to release the compressive force, and the adhesion force is likely to increase due to the influence of a dimensional error or the like.

  On the other hand, as shown in FIG. 4B, when the force acts obliquely with respect to the direction in which the protrusion 12 extends, like the protrusion 12 of the gasket 1 according to this embodiment (arrow in the figure), the protrusion 12 A force is also applied in the direction of tilting (direction perpendicular to the direction in which the protrusion 12 extends), and the protrusion 12 is likely to be deformed. Therefore, according to the gasket 1 which concerns on a present Example, it can suppress effectively that the processus | protrusion 12 produces a deformation | transformation which releases a compressive force, and a contact | adhesion power becomes too high in the case where a dimensional error is large. .

  That is, according to the present embodiment, it is possible to effectively suppress the filling rate from becoming excessively high while maintaining the effect of suppressing dropping or falling due to the protrusion.

DESCRIPTION OF SYMBOLS 1 Gasket 10 Gasket main-body part 10a Overhang | projection part 11a, 11b Seal projection 12 Projection 2 One member 20 Groove 21 Groove bottom 22 Groove side surface 23 Surface 3 Other member 31 Surface

Claims (3)

A gasket that is mounted in a groove provided in one of the two members, is in close contact with the groove bottom surface of the groove and the surface of the other member, and seals the gap between the two members,
A gasket main body closely contacting the groove bottom surface and the surface of the other member;
A protrusion provided on a side surface of the gasket main body and contacting the side surface of the groove;
In a gasket with
The said protrusion is provided so that the said gasket main-body part may be diagonally extended with respect to the direction compressed by the said groove bottom face and the surface of said other member.   The gasket according to claim 1, wherein the protrusions are provided in pairs on both side surfaces of the gasket main body.   The gasket according to claim 1 or 2, wherein a plurality of the protrusions are provided in a longitudinal direction of the gasket main body.

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