JP2007239958A - Gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasket which can exhibit a stable sealing performance, and a repulsive force on mounted is reduced. <P>SOLUTION: The gasket which is mounted to a mounting groove 201 arranged in one side member 200 between 2 members 200, 300, and seals a gap between these 2 members 200, 300 by being compressed by the 2 members 200, 300, characterized in that on both sides 13, 14 of high-pressure side (H), and low-pressure side (L), concave portions 13a, 14a extending in a longitudinal direction, respectively, are provided, and in that when it is compressed by the 2 members 200, 300, the concave portion 13a of the high-pressure side (H) is formed to be deeper than the concave portion 14a of the low-pressure side (L) in depth so that a portion near fuselage center may be curved so as to project toward the low-pressure side (L). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gasket that is compressed by two members to seal a gap between the two members.

  A gasket according to this type of conventional example will be described with reference to FIGS. FIG. 6 is a schematic cross-sectional view showing a state before the gasket according to the conventional example is mounted. FIG. 7 is a schematic cross-sectional view showing a state when the gasket according to the conventional example is mounted. FIG. 8 is a schematic plan view of a gasket according to a conventional example.

  The gasket 100 is used, for example, for an inlet manifold of an automobile engine, a filter blanket, a cylinder head cover, and the like, and is used to seal a gap between two members (the first member 150 and the second member 160). It is done. The gasket 100 is mounted in a mounting groove 151 provided in the first member 150. And the gasket 100 is compressed by the 1st member 150 and the 2nd member 160, and the upper end part 101 and the lower end part 102 closely_contact | adhere to each member surface. Thereby, the clearance gap between two members can be sealed.

  As shown in FIG. 7, the gasket 100 constructed in this way has a substantially vertically long cross-sectional shape with a longer dimension in the height direction than in the width direction, and is compressed by two members during mounting. Curvature deformation occurs near the center of the trunk. As shown in FIG. 8, the planar shape of the gasket 100 is formed in an annular shape in which the straight portion S and the corner portion C are mixed, and therefore, in the gasket having a symmetrical cross-sectional shape, the outer side (low pressure side (L)). The convex corner part C tends to bend outward (curvature so that the center of the body part protrudes outward), but in the straight line part S, the direction of deformation is not determined and the outward curve A portion to be deformed and a portion to be bent and deformed inward (high pressure side (H)) (curved so that the vicinity of the center of the body portion protrudes inward) coexist, and a twist occurs at a portion where the deformation direction is reversed. Since the gasket 100 does not sufficiently adhere to the first member 150 and the second member 160 at a place where such twisting occurs, the sealing function is not sufficiently exhibited.

  In recent years, engine members have been made of resin or aluminum for the purpose of weight reduction, and the rigidity of engine members has been reduced accordingly. A low one is required.

For example, Patent Document 1 and Patent Document 5 disclose a gasket in which protrusions are provided on the side surfaces to prevent inclination, refraction, curvature, etc., but the sealing performance is prevented by preventing the inclination, refraction, curvature, etc. of the gasket. Although it can be increased, the compression rate of the gasket at the time of mounting increases, so that the repulsive force of the gasket generated at the time of mounting becomes large.
Japanese Patent No. 3310547 Japanese Patent Laid-Open No. 10-184924 JP 2002-21635 A Japanese Patent Laid-Open No. 2002-71024 JP 2003-269613 A

The present invention has been made in order to solve the above-described problems of the prior art, and an object of the present invention is to provide a gasket that can exhibit stable sealing performance and reduce repulsive force during mounting. There is.

In order to achieve the above object, the gasket of the present invention comprises:
In the gasket that is mounted in the mounting groove provided in one of the two members and is compressed by the two members to seal the gap between the two members,
On both sides of the high-pressure side and the low-pressure side, each has a recess extending in the longitudinal direction,
When compressed by two members, the concave portion on the high pressure side is formed deeper than the concave portion on the low pressure side so as to bend and deform so that the vicinity of the center of the body protrudes toward the low pressure side region. To do.

  According to the configuration of the present invention, the gasket is curved and deformed so that the vicinity of the center of the body protrudes toward the low pressure side region. Accordingly, since the gasket bending direction does not vary, it is possible to prevent the gasket from being twisted. Further, the recesses provided on both side surfaces of the gasket easily deform the gasket due to the compression by the two members, so that the repulsive force of the gasket against the compression is reduced.

  An arc shape may be sufficient as the cross-sectional shape of the said recessed part.

  By making the cross-sectional shape of the concave portion into an arc shape, stress concentration during compression by the two members can be suppressed.

  The depth of the recess may be 5% or more and 15% or less with respect to the width dimension of the gasket cross section.

The end of the other member side of the two members is
A flange that extends into the gap between the two members and expands the sealing surface with the other member;
When the gasket is curved and deformed so that the vicinity of the center of the body protrudes toward the low pressure side, the structure may be in close contact with the other member in a planar shape.

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

  As described above, according to the present invention, stable sealing performance can be exhibited, and the repulsive force at the time of mounting is reduced.

  The best mode for carrying out the present invention will be exemplarily 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. .

  With reference to FIGS. 1-5, the gasket which concerns on the Example of this invention is demonstrated. FIG. 1 is a schematic plan view of a gasket according to the present embodiment. FIG. 2 is a schematic cross-sectional view of the gasket according to the present embodiment, and is a cross-sectional view taken along AA in FIG. FIG. 3 is a schematic cross-sectional view illustrating a state when the gasket according to the present embodiment is mounted (before compression). FIG. 4 is a schematic cross-sectional view showing a state when the gasket according to the present embodiment is mounted (at the time of compression). FIG. 5 is a table showing the results of a comparative experiment of gaskets according to examples of the present invention.

<Composition and outline of gasket>
As shown in FIG. 1, the gasket 1 according to the present embodiment is an annular member in which a straight portion S and a corner portion C are mixed in a planar shape. For example, as shown in FIG. 2, the cross-sectional shape has a longer dimension in the height direction than in the width direction. In addition, as a material of the gasket 1, rubber materials, such as acrylic rubber of the rubber hardness (durometer A: JISK6253) 40-70, nitrile rubber, a fluorine rubber, thermoplastic elastomer, etc. can be used, for example.

  Here, in the gasket 1, both end portions in the height direction (hereinafter referred to as the first end portion 11 and the second end portion 12, respectively) are portions that form seal surfaces. In this embodiment, in order to improve the sealing performance, the first end portion 11 and the second end portion 12 are formed with annular seal protrusions 11a and 12a, respectively.

  Further, both sides of the first end portion 11 protrude in a flange shape on the high pressure side (H) and the low pressure side (L) (flange portion 11b), and the sealing surface by the first end portion 11 is the second end portion. 12 is enlarged to the high pressure side (H) and the low pressure side (L).

  Further, the first end portion 11 is formed with seal projections 11c on the inner side and the outer side of the seal projections 11a (in the cross section, they are formed substantially symmetrically with respect to the seal projections 11a). The seal protrusion 11c has a height smaller than that of the seal protrusion 11a, and is disposed on the seal surface enlarged by the flange portion 11b.

  In the present embodiment, the side surface 13 (corresponding to the inner surface here) and the side surface 14 (here corresponding to the outer surface) of the low pressure side (L) to the high pressure side (H) of the gasket 1, Recesses 13a and 14a extending in the longitudinal direction (here, the circumferential direction) are formed. In this embodiment, recesses 13a and 14a are formed over the entire side surface.

  The recesses 13a and 14a are formed so that the cross-sectional shape is an arc shape, and the depth of the gasket 1 with respect to the widthwise dimension is such that the recess 13a on the high pressure side (H) is on the low pressure side (L). It is formed so as to be deeper than the recess 14a.

  The gasket 1 configured as described above is used to seal a gap between two members (hereinafter referred to as a first member 200 and a second member 300). That is, the gasket 1 is mounted in the mounting groove 201 provided in the first member 200.

  The gasket 1 is compressed by the first member 200 and the second member 300, whereby the first end portion 11 (seal protrusions 11 a and 11 b) is in close contact with the surface of the second member 300, and the second end portion 12. The (seal protrusion 12a) is in close contact with the groove bottom surface of the mounting groove 201 provided in the first member 200. Thereby, the clearance gap between two members can be sealed.

  In addition, as a use application of the gasket 1 which concerns on a present Example, the use for the inlet manifold of an automobile engine, the filter blanket, the cylinder head cover etc. can be considered, but it cannot be overemphasized that it is not restricted to these uses.

<When gasket is installed (before compression)>
First, the gasket 1 is mounted in a mounting groove 201 provided in the first member 200 as shown in FIG. Here, in a state before being compressed by the first member 200 and the second member 300, the gasket 1 is in a straight state in the mounting groove 201.

In the figure, T0 indicates the center line of the gasket 1 in the width direction. This center line T0 is perpendicular to the groove bottom surface and is not curved in a state before being compressed by the first member 200 and the second member 300.

  Here, the seal protrusions 11a and 12a are formed on the center line T0 with respect to the first end portion 11 and the second end portion 12, respectively. Further, the flange portion 11b of the first end portion 11 protruding to the high-pressure side (H) and the low-pressure side (L) respectively has a length between the tips thereof larger than the width dimension of the mounting groove 201. It is configured.

<When gasket is installed (compressed)>
Next, when the second member 300 is attached to the first member 200, the gasket 1 is compressed by the first member 200 and the second member 300 as shown in FIG. In addition, the arrow P in the drawing indicates the direction of the compressive force applied by the second member 300.

  Here, in this embodiment, concave portions 13a and 14a extending in the longitudinal direction are formed on the side surface 13 (inner side surface) on the high pressure side (H) and the side surface 14 (outer side surface) on the low pressure side (L) of the gasket 1, respectively. The depth of the gasket 1 with respect to the widthwise dimension is such that the high-pressure side (H) recess 13a is deeper than the low-pressure side (L) recess 14a.

  Therefore, when the gasket 1 is compressed by the first member 200 and the second member 300, the gasket 1 is curved and deformed so that the vicinity of the center of the body protrudes toward the low pressure side (L). In addition, since the recessed parts 13a and 14a are formed over the whole side surface of the gasket 1, the gasket 1 is curvedly deformed as described above.

  Further, as shown in FIG. 4, the center line T1 in the width direction of the gasket 1 during compression is curved. And the both ends (the 1st end part 11 and the 2nd end part 12) which form a sealing surface are inclined in the 2nd end part 12 toward the high voltage | pressure side (H), and a 1st end part is 2nd. It faces the surface of the member 300 substantially in parallel.

  The first end portion 11 that is in close contact with the second member 300 has a sealing surface that is enlarged in the width direction by the flange portion 11b that protrudes to the high-pressure side (H) and the low-pressure side (L), and the enlarged portion The formed seal protrusion 11b contacts the second member 300 on the inside and outside of the seal protrusion 11a. That is, in the initial stage of compression by the first member 200 and the second member 300, the first end portion 11 contacts the second member 300 at three points by the seal projection 11a and the seal projections 11b on both sides in the cross section. In this configuration, the second member 300 is brought into close contact with the surface of the second member 300.

  On the other hand, in the initial stage of compression by the first member 200 and the second member 300, the second end portion 12 that is in close contact with the groove bottom surface of the mounting groove 201 is mounted at one point only by the seal protrusion 12a formed on the center line. It is configured to contact the groove bottom surface of the groove 201, and the gasket 1 is curved and deformed due to the compression of the first member 200 and the second member 300, so that the groove 201 is in close contact with the groove bottom surface of the mounting groove 201. .

  Further, when the gasket 1 is curved and deformed by the compression of the first member 200 and the second member 300, the low-pressure side (L) side surface 14 comes into contact with the side surface 201 a of the mounting groove 201.

FIG. 4 shows the gasket 1 with respect to the dimension in the height direction from the groove bottom of the mounting groove 201 to the surface of the second member 300 when the first member 200 and the second member 300 are attached. This is a case where the interference of the dimension in the height direction is small. Therefore, when the interference is increased, the gasket 1 is refracted near the center of the body, and the flange portion of the first end portion 11 extends into the gap between the first member 200 and the second member 300. 11b is the first outside the mounting groove 201.
It is sandwiched between the surface of the member 200 and the surface of the second member 300 so as to be in close contact with each other.

<Excellent point of gasket according to this example>
According to the gasket 1 according to the present embodiment, when the gasket 1 is compressed by the first member 200 and the second member 300 due to the provision of the recesses 13a and 14a, L) It is curved and deformed so as to protrude toward L). Therefore, the gasket 1 does not vary in the bending direction, and thus it is possible to prevent the gasket 1 from being twisted.

  In addition, by forming the recesses on both side surfaces of the gasket 1, the gasket 1 is likely to be deformed by the compression by the first member 200 and the second member 300, so the repulsive force of the gasket 1 against the compression is reduced. The

  That is, if the purpose is only to make the curved direction of the gasket 1 constant, the occurrence of twisting can be suppressed even with a configuration in which a recess is formed only on the side of the high pressure side (H) of the gasket 1, As in the gasket 1 according to the present embodiment, the concave portions are formed on both side surfaces, so that the effect of reducing the repulsive force against the compression by the first member 200 and the second member 300 in addition to the prevention of twisting. Obtainable.

  Moreover, the stress concentration at the time of the compression by the 1st member 200 and the 2nd member 300 can be suppressed by making the cross-sectional shape of the recessed parts 13a and 14a into circular arc shape. However, it is needless to say that the cross-sectional shape of the recess is not limited to an arc shape and can be changed as appropriate.

  In addition, the depth from the side surfaces 13 and 14 of the recesses 13a and 14a can be set as appropriate depending on the specifications of the gasket, the mounting groove, etc., but within the range of 5% or more and 15% or less with respect to the width dimension of the gasket 1. It is preferable that That is, if it is less than 5%, the effect of reducing the repulsive force against compression by the first member 200 and the second member 300 is reduced, and if it exceeds 15%, molding of the gasket becomes difficult. In addition, based on research conducted by the inventors of the present application, the repulsive force of the gasket does not change even if the width of the recess (the length in the height direction of the gasket cross section) is changed, and only the depth of the recess affects the repulsion force. Know to give.

  Further, the seal protrusion 11c is formed to be lower than the seal protrusion 11a, and the seal protrusion 11a abuts against the second member 300 on both sides of the seal protrusion 11a, thereby making the seal protrusion 11a perpendicular to the surface of the second member 300. Act to maintain. Further, since the seal protrusion 11a is formed to be higher than the seal protrusions 11c on both sides, the seal protrusion 11a is compressed more than the seal protrusion 11c, and at one point of the seal protrusion 11a. Surface pressure is increased. Thereby, the stable sealing performance with respect to the 2nd member 300 of the 1st end part 11 can be acquired.

  Further, the second end portion 12 is configured to be in close contact with the seal protrusion 12a at one point, and the surface pressure with respect to the mounting groove 201 is increased, so that the sealing performance is improved. Note that the second end portion 12 is inclined and in close contact with the groove bottom of the mounting groove 201, but is inclined to the high pressure side (H), so that a decrease in sealing performance is suppressed.

  In the present embodiment, the case where the planar shape of the gasket 1 is a non-circular shape in which straight portions and corner portions are mixed has been described as an example. However, the circular shape is not excluded from the shape of the gasket according to the present invention. Absent.

Further, in this embodiment, the recesses 13a and 14a are formed on the lower side of the gasket 1, that is, on the groove bottom side of the mounting groove 201 from near the center of the body, but the positions where the recesses 13a and 14a are formed are It is not limited. However, when the concave portion is formed on the upper side from the vicinity of the center of the body, the gasket may be inclined at the time of mounting. In addition, it is also preferable to form a depression preventing projection or the like in the space vacated in the central portion of the side surface by forming the concave portion on the lower side. In addition, the recesses 13 a and 14 a are preferably formed so as to be accommodated in the mounting groove 201 before being compressed. In this way, when the gasket 1 is compressed by the first member 200 and the second member 300, a portion protruding by the curved deformation of the gasket 1 becomes the inside of the mounting groove 201, and a part of the gasket 1 is deformed by the curved deformation. Protruding from the mounting groove 201 is prevented.

  Further, the number of the recessed portions 13a and 14a to be formed is not limited to one on each of the side surfaces 13 and 14, and a plurality of the recessed portions 13a and 14a may be formed on the inner side surface 13 and the outer side surface 14, respectively. Of course, it is possible to form.

  Furthermore, in this embodiment, the recesses 13a and 14a are formed over the entire side surface of the gasket 1, but a configuration in which a recess is formed in a part of the side surface may be employed. That is, the concave portion may be formed only on the side surface of the portion that may be bent in the direction opposite to the desired bending direction. In this embodiment, the side surface of the straight portion S in the gasket plan view of FIG. Alternatively, the concave portion may be formed only on the surface.

<Comparison experiment>
Here, the stability and low resilience of the sealing performance of the gasket according to the present embodiment will be described with reference to FIG. FIG. 5 is a table showing the results of a comparative experiment using a comparative example in which the configuration such as the number of recesses and the depth is different from that of the gasket of this example.

  The gasket used in the experiment is made of a rubber material having a rubber hardness of 60, the gasket height is 8.9 mm, the gasket width is 2.2 mm, and the inner recess depth ratio (ratio to the gasket width) is 0, 7, The cross-sectional shape was 14% and the outer recess depth ratio (ratio to gasket width) was 0, 7, and 14%. This gasket was attached to a member having a groove having a depth of 5 mm and a width of 3 mm, and compressed by 3.1 mm with a member having a flat surface. The presence or absence of reversal of the deformation direction and the repulsive force obtained as a result are shown in the table of FIG.

  First, no. 1 and No. Compare 9 No. No. 1 is a gasket in which no recess is formed on either side. Reference numeral 9 denotes a gasket having recesses formed on both side surfaces. No. The depth of the recess formed in the gasket No. 9 is the same depth on both side surfaces. 1 and No. 9 has an axially symmetric cross-sectional shape with respect to the center line of the gasket cross-section. Therefore, no. 1 and No. None of the deformation directions of 9 is fixed, and twisting occurs. However, it can be seen from the results in the table that the repulsive force of the gasket is reduced by forming the recess (3.4 → 2.9).

  Next, no. 1 and No. Compare 7 No. 7 is a gasket in which the concave portion is formed only on the high-pressure side (that is, inside). No. No. 7, since the concave portion is formed on the high-pressure side, it is easy to bend and deform so that the vicinity of the center of the body protrudes toward the low-pressure side (outside), so that the deformation direction is fixed and the occurrence of twisting is prevented. I understand that. Moreover, it turns out that the repulsive force of a gasket is reduced by forming a recessed part (3.4-> 3.0)

  Next, no. 7 and no. Compare 9 No. No. 7 has a recess formed only on one side. 9 has recesses on both sides. From the results in the table, it can be seen that the repulsive force of the gasket is reduced by forming recesses on both side surfaces (3.0 → 2.9).

Finally, no. No. 8 7 and no. Compare with 9. No. Reference numeral 8 denotes a gasket in which recesses are formed on both side surfaces, and the recesses on the high pressure side are formed deeper than the recesses on the low pressure side. That is, it corresponds to the gasket of this embodiment. No. In comparison with No. 7, no. No. 7 has a recess on the high-pressure side to make the cross-section asymmetric and to have a certain degree of deformation in the gasket deformation direction. 8 indicates that the repulsive force of the gasket is reduced (3.1 → 3.0). No. In comparison with No. 9, the depth of the recess on the low-pressure side is larger. 9 is superior in the repulsive force of the gasket, but has a symmetrical shape in which both concave portions are formed at the same depth, so the deformation direction of the gasket is not fixed and a twist occurs.

  From the above, No. corresponding to the present embodiment. In the gasket of FIG. 8, the recesses are formed on both side surfaces to reduce the repulsive force of the gasket, and the recess on the high-pressure side is made deeper relative to the recess on the low-pressure side so that the gasket cross section has an asymmetric shape. By doing so, it can be seen that the gasket can be made constant in the deformation direction.

  That is, no. It is possible to make the deformation direction of the gasket constant as in the present embodiment by forming the recess only on the high pressure side as in FIGS. It can be seen that the gasket of No. 8 (this example) can obtain the effect of reducing the repulsive force in addition to the prevention of twisting (no reversal of the deformation direction).

It is a typical top view of the gasket concerning the example of the present invention. It is typical sectional drawing of the gasket which concerns on the Example of this invention. It is typical sectional drawing which shows the state at the time of mounting | wearing with the gasket which concerns on the Example of this invention (before compression). It is typical sectional drawing which shows the state at the time of mounting | wearing (compression) of the gasket which concerns on the Example of this invention. It is a table | surface which shows the result of the comparative experiment of the gasket which concerns on the Example of this invention. It is typical sectional drawing which shows the state before mounting | wearing with the gasket which concerns on a prior art example. It is typical sectional drawing which shows the mode at the time of mounting | wearing in the gasket which concerns on a prior art example. It is a schematic plan view of the gasket which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gasket 11 1st edge part 11a Seal protrusion 11b Flange part 11c Seal protrusion 12 2nd end part 12a Seal protrusion 13 Side surface 13a Recess 14 Side 14a Recess 200 First member 201 Mounting groove 201a Side surface 300 Second member T0, T1 Center line

Claims (4)

In the gasket that is mounted in the mounting groove provided in one of the two members and is compressed by the two members to seal the gap between the two members,
On both sides of the high-pressure side and the low-pressure side, each has a recess extending in the longitudinal direction,
When compressed by two members, the concave portion on the high-pressure side is formed deeper than the concave portion on the low-pressure side so as to bend and deform so that the vicinity of the center of the body protrudes toward the low-pressure side. Gasket to do.   The gasket according to claim 1, wherein a cross-sectional shape of the concave portion is an arc shape.   3. The gasket according to claim 1, wherein a depth of the concave portion is 5% or more and 15% or less with respect to a width dimension of a gasket cross section. The end of the other member side of the two members is
A flange portion that extends into the gap between the two members and expands the sealing surface with the other member;
The gasket according to any one of claims 1 to 3, wherein when the gasket is curved and deformed so that the vicinity of the center of the body protrudes toward the low pressure side, the gasket closely adheres to the other member in a planar shape.

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