JP2009030773A - Sealing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing structure for stabilizing the mounting property of a gasket even when a mounting groove has a great dimensional tolerance, while reducing the manufacturing cost. <P>SOLUTION: The gasket 30 to be mounted in the mounting groove 11 of one member 10 has a body 31 whose dimension in the cross direction of the mounting groove 11 is smaller than at least the groove width of the mounting groove 11 at the side of an opening portion, and seal faces 34, 35, 36 at both ends of the body 31 in the depth direction of the mounting groove 11 to closely contact a surface 21 of the other member 20 and the groove bottom face of the mounting groove 11. The mounting groove 11 is formed with its groove bottom face curved to be the deepest at the center in the groove width direction. On the groove bottom side of the mounting groove 11 of the gasket body 31, a pair of protruded portions 32, 33 are provided which are protruded from both sides of the body 31 in the groove width direction of the mounting groove 11 toward the groove bottom 12 of the mounting groove 11 to form the pair of groove bottom side seal faces 34, 35. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sealing structure in which a gap between two members is sealed with a gasket.

  Various devices such as gaskets and packings have been conventionally known as sealing devices for sealing a gap between two members, and the shapes thereof are various. There are also various sealing structures in which these sealing devices are used.

  For example, Patent Document 1 is configured such that a seal ring mounted in an annular groove of a lower cylindrical member is compressed between the lower end surface of the upper cylindrical member and a bottom wall of the annular groove to exhibit a sealing action. Various sealing ring cross-sectional shapes devised to increase the crushing amount of the seal ring and reduce the crushing force have been proposed.

  Patent Document 2 discloses a sealing structure in which a gasket made of a rubber-like elastic material is mounted between an annular groove provided in one member and the other member, and an annular pressure contact portion is provided in the gasket. By forming a marginal space at the time of mounting, the filling rate in the annular groove of the gasket does not exceed 100%.

Further, Patent Document 3 discloses a hard disk drive gasket that is integrally formed on a substrate.
Japanese Utility Model Publication No. 61-147751 Japanese Utility Model Publication No. 62-108661 JP 2000-100125 A

  By the way, in recent years, in order to reduce the manufacturing cost, a gasket mounting groove may be formed by press working in manufacturing a metal housing or the like. When forming the mounting groove by press working, it is substantially difficult to form the cross-sectional shape of the groove in a rectangular shape, and the boundary between the side surface of the mounting groove and the groove bottom and the corners such as the opening are curved. In addition, the dimensional tolerance of the mounting groove is larger than that formed by other methods.

  On the other hand, the structure of the sealing device is required to be smaller due to the demand for miniaturization of the device, and in the case where the mounting groove is formed by press working, the size tolerance is large for the miniaturization of the device. It becomes a neck.

  As described above, under the condition that the dimensional tolerance of the shape of the mounting groove is large, depending on the above-described conventional technology, the dropping or falling of the gasket or the like may not be sufficiently prevented. That is, the above-described prior art is based on the premise that the shape of the gasket or the mounting groove is formed according to a predetermined dimension. When the mounting groove is formed in a metal housing by pressing, the mounting groove It is difficult to place a fine restriction on the shape of

  This point will be described with reference to FIG. FIG. 8 shows a schematic cross-sectional view of a sealing structure according to the prior art.

The sealing structure shown in the figure is composed of two members (one member 1) assembled together by means not shown.
00 and the other member 200) is sealed by the gasket 300. One member 100 is provided with a mounting groove 101 having a substantially rectangular cross section, and a gasket 300 is mounted in the mounting groove 101.

  The gasket 300 has a vertically long cross section, and is configured such that the lateral width W1 is narrower than the lateral width W2a of the mounting groove 101 in order to improve the mounting property of the gasket 300 to the mounting groove 101.

  After the gasket 300 is mounted in the mounting groove 101, the gasket 300 is compressed by assembling the one member 100 and the other member 200. Then, both end portions in the vertical direction of the gasket 300 are in close contact with the groove bottom surface 102 of the mounting groove 101 and the surface 201 of the other member 200 to form seal surfaces 301 and 302.

  However, in such a configuration, when the mounting groove 101 is formed by press working, the dimensional tolerance increases. Therefore, depending on the size of the error, as shown by the solid line in FIG. Alternatively, the boundary between the groove bottom 102 and the side surface 103 may be greatly curved, and a region where the groove width of the mounting groove 101 is narrower than the lateral width W1 of the gasket 300 may be formed (W2b).

  The lateral width W1 of the gasket 300 is determined based on the assumption that the mounting groove 101 is formed in a substantially rectangular cross-sectional shape indicated by the broken line 104 in FIG. 8, that is, the horizontal width of the mounting groove 101 is always constant. Since the width of the mounting groove 101 is narrower than the width of the gasket 300 because the width is smaller than the width W2a, the gasket 300 and the mounting groove 101 are formed on the groove bottom side of the mounting groove 101. A crushing allowance I is formed between them.

  When such a crushing margin is generated, the gasket 300 cannot fit in the mounting groove 101, or the repulsive force received from the mounting groove 101 at the time of mounting becomes large and the mounting posture becomes unstable, which causes dropping.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a sealing structure in which the mounting property of the gasket is stable even when the dimensional tolerance of the mounting groove is large. is there.

  Another object of the present invention is to provide a sealing structure capable of reducing the manufacturing cost by stabilizing the gasket mounting performance regardless of the dimensional tolerance of the mounting groove.

In order to achieve the above object, the sealing structure in the present invention comprises:
A sealing structure that seals a gap between two members with a gasket,
The gasket is mounted in a mounting groove provided in one of the two members,
The gasket includes a main body portion having a dimension in the width direction of the mounting groove that is at least smaller than a groove width on the opening side of the mounting groove, and at both ends of the main body portion in the depth direction of the mounting groove. In the sealing structure having a sealing surface that is in close contact with the surface of the other member of the members and the groove bottom surface of the mounting groove,
The mounting groove is a groove composed of a curved surface where the groove bottom surface has the deepest groove depth at the center in the groove width direction,
On the groove bottom side of the mounting groove in the main body portion of the gasket, a pair of projecting portions that protrude from both sides of the main body portion in the groove width direction of the mounting groove toward the groove bottom of the mounting groove are provided. ,
The seal surface that is in close contact with the groove bottom surface is formed as a pair of groove bottom side seal surfaces by the pair of protrusions being in close contact with the groove bottom surface of the mounting groove.

  By configuring the groove bottom surface of the mounting groove with a curved surface, the curvature of the curved surface of the groove bottom of the mounting groove changes due to a dimensional error during manufacturing of the mounting groove, or the mounting groove on the groove bottom side of the mounting groove. By forming a region where the groove width is smaller than the lateral width of the main body portion of the gasket, a crushing margin may occur between the gasket and the mounting groove. Even in such a case, according to the present invention, the pair of protrusions are pushed into the gaps provided between the protrusions according to the magnitude of the reaction force received from the surface of the mounting groove. By deforming in such a manner, the repulsive force that the gasket receives from the surface of the mounting groove is released and the mounting posture of the gasket is suppressed from becoming unstable.

  In addition, even when the dimensional error of the mounting groove is large as described above, the mounting posture of the gasket does not become unstable, so that it is possible to reduce the processing accuracy of the mounting groove while maintaining the sealing performance of the gasket. Therefore, the manufacturing cost of the mounting groove can be reduced.

On the other member side of the main body portion of the gasket, a pair of second projecting portions are provided that project toward the other member from both sides of the main body portion in the groove width direction of the mounting groove,
The seal surface that is in close contact with the surface of the other member is formed as a pair of other member-side seal surfaces when the pair of second protrusions are in close contact with the surface of the other member,
The cross section of the gasket may be symmetrical with respect to a center line passing between the other member-side seal surface and the groove bottom-side seal surface.

  In this way, the gasket can be mounted in the mounting groove regardless of the front and back of the gasket. Therefore, it is not necessary to check the front and back of the gasket when mounting the gasket, and the mounting performance is improved.

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

  As described above, according to the present invention, even when the dimensional tolerance of the mounting groove is large, the gasket mounting property is stable, and the gasket mounting property is stable regardless of the dimensional tolerance of the mounting groove. Can be 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. .

Example 1
With reference to FIGS. 1-6, the sealing structure which concerns on Example 1 of this invention is demonstrated. FIG. 1 is a schematic cross-sectional view of a gasket according to Embodiment 1 of the present invention. FIG. 2 is a schematic cross-sectional view of the sealing structure according to the first embodiment of the present invention. FIG. 3 is a plan view of the gasket according to the first embodiment of the present invention. FIG. 4 is a schematic perspective view of the gasket according to the first embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of the sealing structure according to the first embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of the sealing structure according to the first embodiment of the present invention.

<Outline of sealing structure>
The sealing structure according to the present embodiment is a structure in which a gap between two members (one member 10 and the other member 20) is sealed with a gasket 30. The one member 10 and the other member 20 are assembled to each other by means not shown (for example, known means such as fitting, fastening with screws, adhesion, etc.).

  The state after assembling one member 10 and the other member 20 is not limited to the state shown in the drawing. That is, depending on the target product, the surface of one member 10 and the surface of the other member 20 may be closely attached so that the mounting groove 11 provided in one member 10 is closed. Moreover, both may be assembled so that a certain amount of gap is formed between the two members. Therefore, the gasket 30 may be compressed further than the state shown in the drawing.

<Configuration of mounting groove>
The mounting groove 11 for mounting the gasket 30 is provided on the surface of the one member 10 facing the other member 20. In the mounting groove 11, the groove bottom 12 is formed by a curved surface, and the central part in the groove width direction is the deepest part of the mounting groove 11. The boundary between the groove bottom 12 and the side surface 13 and the boundary between the groove opening and the surface of one member 10 are also curved. This groove shape is formed when the mounting groove 11 is formed by press working that is relatively inexpensive to manufacture.

  Note that the method for producing the mounting groove is not limited to press working, and for example, it may be produced by cutting. In this case, the groove bottom may be curved as a result by lowering the processing accuracy. That is, the processing accuracy required to form the mounting groove in a substantially rectangular cross section is not necessary.

<Composition of gasket>
The gasket 30 has a pair of main body 31 and a pair of protrusions projecting from both sides in the groove width direction of the mounting groove 11 of the main body 31 toward the groove bottom side of the mounting groove 11 on the groove bottom side of the mounting groove 11 of the main body 31. Protrusions 32 and 33 are provided.

  The gasket 30 has seal surfaces 34, 35, 36 on both sides in the vertical direction (depth direction of the mounting groove 11). A pair of protrusions 32 and 33 provided on the main body 31 are in close contact with the groove bottom 12 of the mounting groove 11 to form a pair of seal surfaces 34 and 35, and the protrusions 32 and 33 in the vertical direction of the main body 31. The side opposite to the side on which is provided is in close contact with the surface 21 of the other member 20 to form the sealing surface 36. Thereby, the clearance gap between two members is sealed.

  The planar shape of the gasket 30 (the shape seen from the upper surface) varies depending on the target product to which the gasket is applied, and FIG. 3 shows an example. Other planar shapes of the gasket include, for example, a circular shape, a polygonal shape, and a complicated shape. The planar shape of the mounting groove 11 is not particularly illustrated, but is similar to the planar shape of the gasket 30.

  In a state where the gasket 30 is not compressed between the two members, the cross section of the main body portion 31 is configured in a vertically long shape, and the horizontal width is configured to be narrower than the groove width of the mounting groove 11. Here, the transverse cross section means a cross section perpendicular to the longitudinal direction of the gasket 30. For example, the AA cross section in FIG. 3 corresponds to this. Thus, by making the cross section of the main body portion 31 into a vertically long shape, it is possible to achieve a crushing rate and a filling rate that satisfy the sealing performance even in a small case.

The lateral width of the main body 31 is configured to be narrower than the groove width of the mounting groove 11, and the gasket 3
The mounting property to the zero mounting groove 11 is improved. The pair of protrusions 32 and 33 are provided over the entire area along the longitudinal direction of the gasket 30, and form the seal surfaces 35 and 36 over the entire circumference of the gasket 30.

  As shown in FIG. 2, when the gasket 30 is mounted (the gasket 30 is compressed in the longitudinal direction), the pair of projecting portions 32 and 33 are subjected to a reaction force received from the curved groove bottom surface between the two. It deform | transforms so that it may each be pushed into the formed clearance gap side. Thus, the deformation | transformation of the protrusion parts 32 and 33 will mount | wear with the gasket 30 in the mounting groove 11 in the state in which the dimensional error of the groove bottom shape of the mounting groove 11 was absorbed.

  That is, the groove width (W2a) is larger than the lateral width (W1) of the gasket 30 in most of the region of the mounting groove 11, but the tip side of the protrusions 32 and 33 of the gasket 30, that is, the mounting groove 11 On the groove bottom side, the groove bottom is configured to have a curved surface, so that a region (W2b) in which the groove width of the mounting groove 11 is partially narrower than the lateral width of the gasket 30 is formed. When the gasket 30 is compressed in the vertical direction at the time of mounting, only the projecting portions 32 and 33 and the peripheral portion thereof are deformed according to the shape of the groove bottom of the mounting groove 11, so that the overall mounting posture is obtained. Change is suppressed.

<Excellent points of this embodiment>
As shown by broken lines 32 a and 33 a in FIG. 2, even when a crushing margin is generated between the gasket 30 and the mounting groove 11, the mounting posture of the gasket 30 becomes unstable due to the deformation of the projecting portions 32 and 33. Is suppressed.

  Therefore, the gasket 30 can be prevented from dropping from the mounting groove 11 when the gasket 30 is mounted in the mounting groove 11 or when the two members are assembled after the gasket 30 is mounted.

  Moreover, since the repulsive force from the mounting groove 11 is absorbed by the deformation of the projecting portions 32 and 33, variations in surface pressure generated on the seal surfaces 34, 35, and 36 when the two members are assembled are suppressed. Sealing performance is stable.

  Further, even if the dimensional error of the mounting groove 11 is large, the mounting posture of the gasket 30 is not unstable and the sealing performance is maintained. Therefore, it can be suitably applied under the condition that the dimensional tolerance of the mounting groove 11 increases. .

  Therefore, even when a construction method such as press working, which is low in cost but large in dimensional tolerance, is adopted for manufacturing the mounting groove 11, the mounting property and sealing performance of the gasket 30 can be maintained, and the manufacturing cost can be reduced. Reduction can be achieved.

  Further, as shown in FIG. 5, since the dimensional error of the mounting groove 11 is large, even if the region where the groove width of the mounting groove 11 is narrower than the lateral width of the gasket 30 is formed in a wide range, the protruding portion The protrusions 32 and 33 and their peripheral portions are deformed so as to fill the gap between the portions 32 and 33, thereby suppressing an increase in the filling rate.

  Accordingly, the height (protrusion amount) and interval (distance between the protrusions 32 and 33) of the protrusions 32 and 33 of the gasket 30 are determined in consideration of the dimensional tolerance of the mounting groove 11, and the protrusions 32, Even when the deformation of 33 is the largest, it is preferable that there is no gap between them.

Moreover, as shown in FIG. 6, depending on the use environment to which the sealing structure according to the present embodiment is applied, the gasket 30 may be in a state where it receives a large pressure P from one side in the width direction. In this case, the gasket 30 is pushed into the low pressure side of the mounting groove 11, but the protrusion 33 on the low pressure side of the pair of protrusions 32 and 33 is deformed relatively larger than the protrusion 32 on the high pressure side. Thus, the change of the shape (groove width) of the mounting groove 11 is absorbed. Thereby, the mounting posture of the gasket 30 is maintained. That is, a change in the posture of the entire gasket when pushed into the low pressure side is reduced, and a decrease in sealing performance is suppressed.

  In addition, when the gasket 30 is pushed into the low pressure side, the adhesion degree of the high pressure side protrusion 32 to the mounting groove 11 may be reduced. However, the side surface of the main body 31 of the gasket 30 on the low pressure side of the mounting groove 11 is considered. Since the sealing is performed in close contact with the side surface on the low-pressure side, a decrease in sealing performance is suppressed.

  Therefore, even in such a use environment, it is possible to reduce the manufacturing cost of the mounting groove by employing press working or the like.

<Modification>
Next, a modification of the sealing structure according to the present embodiment will be described with reference to FIG. FIGS. 7A to 7D are schematic cross-sectional views of various gaskets according to modifications. Hereinafter, matters that are not particularly described are the same as those in the above-described embodiment, and the same components are denoted by the same reference numerals, description thereof is omitted, and only different points will be described.

<< Modification 1 >>
The gasket 30a according to the first modification shown in FIG. 7A has a configuration in which protrusions 37 for preventing a fall are provided on both lateral sides of the gasket 30 according to the above embodiment. Thereby, the protrusion 37 supports the gasket 30a in the mounting groove 11, so that the fall of the gasket 30a can be suppressed.

  These projections 37 may be provided over the entire region along the longitudinal direction of the gasket 30a, so that the posture of the gasket 30a can be stabilized during mounting. Alternatively, in order to suppress an increase in the filling rate of the gasket 30a, these protrusions 37 may be provided partially along the longitudinal direction of the gasket 30a.

<< Modification 2 >>
A gasket 30b according to Modification 2 shown in FIG. 7B is provided with a pair of protrusions 38 and 39 on the groove bottom side and the groove opening side on each lateral side surface of the gasket 30 according to the above embodiment. It becomes the composition.

  The protrusions 38 and 39 are provided at a predetermined interval, and the protrusion 38 on the groove bottom side is located between the protrusion 39 on the groove opening side according to a change in the shape of the mounting groove 11 (size error). It is comprised so that it can deform | transform so that it may be pushed in into a clearance gap side. Thereby, the increase in the filling rate of the gasket 30b by the dimensional error etc. of the mounting groove 11 can be suppressed.

<< Modification 3 >>
In the gasket 30c according to the modified example 3 shown in FIG. 7C, a pair of protrusions are provided not only at the end on the groove bottom side but also at the opposite end as in the gasket 30 according to the above embodiment. It has a configuration.

  As can be seen from the figure, the gasket 30c has a cross section that is symmetrical with respect to the center line X passing between the pair of protrusions 32, 33 on the groove bottom side and the pair of protrusions 40, 41 on the other member side. In other words, the shape is symmetrical in the vertical direction in FIG.

  Therefore, the gasket 30c can be mounted in the mounting groove 11 regardless of the orientation of the front and back of the gasket 30c, that is, even if the groove bottom side and the groove opening side of the gasket 30c are opposite to each other. It is not necessary to check the front and back of the gasket when mounting the gasket, and the gasket mounting performance is improved.

<< Modification 4 >>
In the gasket 30d according to Modification 4 shown in FIG. 7D, the lateral width of the main body 31a gradually narrows from the side where the pair of protrusions 31 and 32 in the main body 31a is provided toward the opposite side. It has a configuration. Accordingly, a sealing surface 36a having a narrower width than the sealing surface 36 of the above embodiment is formed.

  With this configuration, the region where the gasket 30d receives force from the surface 21 of the other member 20 is concentrated in the central portion in the lateral width direction of the gasket 30d, that is, between the pair of projecting portions 32 and 33. The balance of the force received at the time of mounting is improved, and the mounting properties and sealing performance are improved (arrows in the figure).

  In addition, the said modification is an example to the last, and if it is the structure by which a pair of projection part was provided in the groove bottom side of the gasket main body, it will not be restricted to the said modifications 1-4, A various change etc. are possible. Needless to say.

The typical sectional view of the gasket concerning the example of the present invention. The typical sectional view of the sealing structure concerning the example of the present invention. The top view of the gasket which concerns on the Example of this invention. The typical perspective view of the gasket which concerns on the Example of this invention. The typical sectional view of the sealing structure concerning the example of the present invention. The typical sectional view of the sealing structure concerning the example of the present invention. The typical sectional view of the gasket concerning a modification. The typical sectional view of the sealing structure concerning a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 One member 11 Mounting groove 12 Groove bottom 13 Side surface 20 Other member 21 Surface 30 Gasket 31 Main body part 32, 33 Projection part 34, 35, 36 Seal surface

Claims (2)

A sealing structure that seals a gap between two members with a gasket,
The gasket is mounted in a mounting groove provided in one of the two members,
The gasket includes a main body portion having a dimension in the width direction of the mounting groove that is at least smaller than a groove width on the opening side of the mounting groove, and at both ends of the main body portion in the depth direction of the mounting groove. In the sealing structure having a sealing surface that is in close contact with the surface of the other member of the members and the groove bottom surface of the mounting groove,
The mounting groove is a groove composed of a curved surface where the groove bottom surface has the deepest groove depth at the center in the groove width direction,
On the groove bottom side of the mounting groove in the main body portion of the gasket, a pair of projecting portions that protrude from both sides of the main body portion in the groove width direction of the mounting groove toward the groove bottom of the mounting groove are provided. ,
The sealing structure, wherein the sealing surface that is in close contact with the groove bottom surface is formed as a pair of groove bottom side sealing surfaces by the pair of protrusions being in close contact with the groove bottom surface of the mounting groove. On the other member side of the main body portion of the gasket, a pair of second projecting portions are provided that project toward the other member from both sides of the main body portion in the groove width direction of the mounting groove,
The seal surface that is in close contact with the surface of the other member is formed as a pair of other member-side seal surfaces when the pair of second protrusions are in close contact with the surface of the other member,
2. The sealing structure according to claim 1, wherein a cross section of the gasket has a symmetric shape with respect to a center line passing between the other member-side sealing surface and the groove bottom-side sealing surface.

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