Split gasket

Abstract

To provide a split gasket which does not need welding and a liquid gasket as well.SOLUTION: At both ends of a split pieces (a first split piece 100A and a second split piece 100B), respective cutouts 102 are provided for forming holes through which shaft parts of bolts are inserted to fix two members (a case 10 and a cover 20). The two members are fixed by the bolts to cause compression strain in the split pieces, whereby parts of the adjacent split pieces, on both sides of the cutouts 102, out of the end faces of the split pieces, have contact with each other.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a split gasket. [Background technology]

[0002] Conventionally, a gasket having a metal gasket body is known as a gasket for sealing a gap between the end faces of two members fixed by a plurality of bolts. Such a gasket is obtained by punching a material having a metal plate. Since a gasket is usually annular, the inner part becomes waste material when the gasket is punched out of the material. Therefore, a large amount of waste material is generated, especially in the case of a large gasket. As a countermeasure against this, a technique is known in which a plurality of divided pieces are used and both ends of each divided piece are fixed, respectively, to manufacture an annular gasket. In the case of a method in which both ends of each divided piece are fixed by welding, unevenness occurs in the welded portion, and in the case of a method in which the ends of the divided pieces are overlapped and bonded, a multi-layer structure is obtained. Therefore, the applicant of the present application has proposed a technique of bonding the end faces of adjacent divided pieces with a liquid gasket (see Patent Document 1).

[0003] Stable sealing performance can be obtained according to the technology disclosed in Patent Document 1. However, the liquid gasket requires management such as storage, and a process of applying the liquid gasket is required, which increases costs. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-76467 A Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention provides a split gasket that eliminates the need for welding and eliminates the need for a liquid gasket. [Means for solving the problem]

[0006] The present invention employs the following means to solve the above problems.

[0007] That is, the split gasket of the present invention has the following features: A split gasket includes a plurality of split pieces, each of which has at least a plate-shaped metal gasket body, and is disposed between two members with end faces of both ends of adjacent split pieces in contact with each other, thereby sealing a gap between the end faces of the two members, At both ends of the split piece, a notch is provided to form a hole through which a shaft portion of a bolt for fixing the two members is inserted, The present invention is characterized in that compressive strain generated in the split pieces when the two components are fixed by the bolts causes portions of the end faces of the split pieces on both sides of the notch in adjacent split pieces to come into contact with each other.

[0008] According to the present invention, the compressive strain of the segments brings the end faces of the adjacent segments into contact with each other, so there is no need to weld or glue the segments with a liquid seal or the like to bring the end faces of the segments into contact with each other. In addition, a configuration is adopted in which notches are provided at both ends of the segments to form holes through which the shanks of the bolts that fasten the two members are inserted, so that when the two members are fastened by the bolts, the ends of the segments are firmly fixed. As a result, the adjacent segments are firmly fixed to each other in a positioned state. In addition, compressive strain can be more reliably generated near the end faces of the segments.

[0009] It is preferable that each end of the divided pieces has a curved portion which curves toward one of the two components when not subjected to external force and which deforms into a flat plate when compressed by the two components, at least at the portion where the divided pieces contact each other.

[0010] By adopting such a configuration, when the segments are installed on one of the two components, a sufficient gap is ensured between the end faces of the adjacent segments, making it easy to install multiple segments. On the other hand, when the segments are compressed by the two components, the curved portion is deformed into a flat plate, so that the end faces of the adjacent segments can be more reliably brought into contact with each other even if the amount of compressive strain is set to be small.

[0011] Preferably, the curved portions provided at both ends of the divided piece are both curved toward one of the two members.

[0012] Furthermore, it is also preferable that the curved portion is provided over the entire end portion of the divided piece. Effect of the Invention

[0013] As described above, according to the present invention, it is possible to provide a split gasket that does not require welding and does not require a liquid gasket. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram of a sealing structure including a split gasket according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram of a split gasket according to the first embodiment of the present invention. [Diagram 3] FIG. 3 is a diagram illustrating the mechanism of the split gasket according to the first embodiment of the present invention. [Figure 4] FIG. 4 is an explanatory diagram of a split gasket according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the embodiment of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative positions, and the like of the components described in the embodiment are not intended to limit the scope of the present invention unless otherwise specified.

[0016] Example 1 A split gasket according to a first embodiment of the present invention will be described with reference to Figs. 1 to 3. Fig. 1 is a schematic diagram of a sealing structure including a split gasket according to a first embodiment of the present invention, Fig. 1(a) is a plan view of an apparatus including the sealing structure, and Fig. 1(b) is a side view of the apparatus. In Fig. 1, a part of the internal structure is shown in perspective with dotted lines. Fig. 2 is a schematic diagram of a split gasket according to a first embodiment of the present invention, Fig. 2(a) shows a state in which adjacent split pieces are not in contact with each other, and Fig. 2(b) shows a state in which adjacent split pieces are in contact with each other. Fig. 3 is an explanatory diagram of the mechanism of the split gasket according to the first embodiment of the present invention, Fig. 3(a) is a schematic cross-sectional view explaining an assembly procedure for fixing two members, and Fig. 3(b) is a schematic cross-sectional view showing a state in which the two members are fixed. In each figure, the scale is different from that of a general product in order to emphasize the characteristic configuration of the present invention.

[0017] <Sealed structure> A sealing structure including a split gasket according to a first embodiment of the present invention will be described with reference to Fig. 1. The device shown in Fig. 1 includes a case 10 having a storage section 11 for storing various members, and a lid 20 for closing an opening of the case 10. In this device, these two sections are A split gasket 100 is provided which is disposed between the members (case 10 and lid 20) to seal the gap between the end faces of these two members. In this manner, a sealed structure is formed by the above-mentioned two members and split gasket 100.

[0018] The above two members are configured to be fixed together by a plurality of bolts 30. More specifically, a plurality of screw holes 12 having female threads into which male threads formed on the shanks of the bolts 30 are screwed are provided on the end faces of the four side walls that constitute the case 10. The cover 20 is also provided with a recess 21 having a portion that serves as a seat for the head of the bolt 30, and a plurality of insertion holes 22 (see FIG. 3) through which the shanks of the bolts 30 are inserted. With this configuration, the two members can be fixed together by the plurality of bolts 30.

[0019] <Split gasket> A split gasket 100 according to this embodiment will be described with reference to Figs. 2 and 3. The split gasket 100 shown in Figs. 2 and 3 includes a plurality of split pieces, each of which has at least a plate-shaped metal gasket body 110. In this embodiment, the split gasket 100 is made of two split pieces. For convenience, the two split pieces will be referred to as a first split piece 100A and a second split piece 100B, respectively. The split gasket 100 is configured such that the end faces of adjacent split pieces (the first split piece 100A and the second split piece 100B) are in contact with each other and are disposed between two members (the case 10 and the lid 20) to seal the gap between the end faces of these two members.

[0020] Here, the split gasket 100 is shown to be composed of two segments, but the split gasket of the present invention may be composed of three or more segments. The first segment 100A and the second segment 100B are composed of members of the same size and shape, but the present invention also includes cases where the multiple segments that compose the split gasket have different sizes and shapes. In the case of a gasket having a metal gasket body, it can be obtained by punching out a material having at least a metal plate. In the case of the split gasket 100, the segments can be produced by punching out the material, which greatly reduces waste material.

[0021] The first split piece 100A and the second split piece 100B each include a metal gasket body 110 and an elastic body 120 provided on the surface of the gasket body 110. For example, stainless steel, cold-rolled steel sheet, galvanized steel sheet, and aluminum plywood can be suitably used as the material of the gasket body 110. In addition, a synthetic rubber sheet (including foamed rubber) containing at least one of nitrile rubber, styrene butadiene rubber, fluororubber, acrylic rubber, and silicone rubber can be suitably used as the elastic body 120. Here, a configuration in which the elastic body 120 is provided on one side of the gasket body 110 is shown, but the present invention also includes a configuration in which elastic bodies are provided on both sides of the gasket body, and a configuration in which no elastic body is provided. When a member with a rough surface is used for the two members that constitute the sealing structure, it is desirable to configure the elastic body to be in close contact with each other. When a split piece having an elastic body is used, the split piece can be obtained by punching a material in which an elastic body is provided on the surface of a metal plate.

[0022] In addition, a base treatment agent layer 130 is provided between the gasket body 110 and the elastic body 120. This makes it possible to prevent the elastic body 120 from peeling off from the gasket body 110. However, depending on the usage environment, etc., a configuration in which the base treatment agent layer 130 is not provided may also be adopted.

[0023] The first split piece 100A and the second split piece 100B each have a plurality of holes 101 (three in the illustrated example) through which the shafts of the bolts 30 for fixing the two members are inserted. Each of the bolts 30 has a notch 102 for forming a hole through which the shaft of the bolt 30 passes.

[0024] <Mechanism of split gasket 100> The mechanism of the split gasket 100 will be described. First, multiple split pieces (first split piece 100A and second split piece 100B) are arranged on the end face on the opening side of the case 10, which is one of the two members (see FIG. 3(a)). As shown in the figure, when the first split piece 100A and the second split piece 100B are not compressed by the case 10 and the lid 20, a gap is formed between these end faces.

[0025] Then, when the case 10 and the lid 20 are fixed by the bolt 30, compressive strain is generated in the split pieces (the first split piece 100A and the second split piece 100B). That is, these split pieces are compressed from both sides by the case 10 and the lid 20, and deformation occurs such that they stretch in a direction perpendicular to the compression direction. As a result, in the adjacent split pieces (the first split piece 100A and the second split piece 100B), the parts on both sides of the notch 102 of the split piece end faces come into contact with each other (see Figs. 2(b) and 3(b)). Note that in Fig. 3(b), the bolt 30 is omitted so that the state of the split gasket 100 can be easily understood when the case 10 and the lid 20 are fixed by the bolt 30. As shown in the figure, the notch 102 provided in each of the adjacent split pieces forms a hole through which the shaft part of the bolt 30 is inserted, so that the split pieces do not adversely affect the bolt 30.

[0026] <Advantages of the split gasket according to this embodiment> According to the split gasket 100 of this embodiment, the compressive strain of the segments causes the end faces of adjacent segments (first split piece 100A and second split piece 100B) to come into contact with each other. Therefore, there is no need to weld the end faces of adjacent segments to come into contact with each other, and there is no need to bond them with a liquid seal or the like. This makes it possible to reduce the number of assembly steps (manufacturing steps). In addition, there is no need to manage the liquid seal. Furthermore, by using the split gasket 100 instead of an annular gasket, waste material can also be reduced. As a result, costs can be reduced.

[0027] In addition, a configuration is adopted in which notches 102 are provided at both ends of each split piece to form holes through which the shanks of bolts 30 that secure the two components (case 10 and lid 20) are inserted. Therefore, when the two components are fastened by bolts 30, both ends of the split pieces are firmly fixed. That is, the fastening force of bolts 30 is particularly large near the shanks of bolts 30, so that the split pieces are firmly fixed near both ends. As a result, adjacent split pieces are firmly fixed to each other while being positioned. Also, compressive strain can be more reliably generated near the end faces of the split pieces.

[0028] Example 2 Fig. 4 shows a second embodiment of the present invention. In this embodiment, curved portions are provided at both ends of the divided pieces in the configuration shown in the first embodiment. Since the other configurations and functions are the same as those of the first embodiment, the same components are given the same reference numerals and the description thereof will be omitted as appropriate.

[0029] FIG. 4 is an explanatory diagram of a split gasket according to Example 2 of the present invention. FIG. 4(a) is a schematic diagram of the split gasket, showing in a plan view a state in which adjacent split pieces are not in contact with each other. Also, FIGS. 4(b) and 4(c) are explanatory diagrams of the mechanism of the split gasket, (b) is a schematic cross-sectional view explaining the assembly procedure for fixing two components, and (c) is a schematic cross-sectional view showing the state in which the two components are fixed. FIG. 4(c) corresponds to the AA cross-sectional view of FIG. 1(a). Note that in FIG. 4, the figure is scaled down from a typical embodiment product in order to emphasize the characteristic configuration of the present invention. The scales are different.

[0030] The split gasket 100X according to this embodiment also includes a first split piece 100A and a second split piece 100B. Both the first split piece 100A and the second split piece 100B include a metal gasket body 110, an elastic body 120 provided on the surface of the gasket body 110, and a base treatment agent layer 130, as in the first embodiment. Also, as in the first embodiment, the elastic body 120 may be provided on both sides of the gasket body, or the elastic body 120 may not be provided, or the base treatment agent layer 130 may not be provided. Also, the first split piece 100A and the second split piece 100B according to this embodiment also include a plurality of holes 101 and notches 102.

[0031] In this embodiment, curved portions 103 are provided at both ends of the split pieces (first split piece 100A and second split piece 100B) so as to follow the end faces of the split pieces. These curved portions 103 are configured to bend toward one of the two members (the case 10 in the illustrated example) when not subjected to external force, and are deformed into a flat plate shape by being compressed by the two members. In this embodiment, each of the curved portions 103 is configured to be curved toward the case 10, which is one of the two members. However, the direction in which the curved portions 103 are curved is not limited. For example, a configuration may be adopted in which the curved portion 103 on one end side of the split piece is curved toward the case 10, and the curved portion on the other end side is curved toward the lid 20, or a configuration may be adopted in which both of the curved portions 103 on both end sides are curved toward the lid 20. In this embodiment, a configuration is adopted in which the curved portions 103 are provided over the entire end of the split piece (the entire end including the portion where the notch 102 is provided). However, it is sufficient that the curved portion is provided at least in the portion where the divided pieces contact each other, and a configuration in which no curved portion is provided in the portion of the notch 102 may be adopted.

[0032] In this embodiment as well, first, a plurality of divided pieces (first divided piece 100A and second divided piece 100B) are arranged on the end surface on the opening side of case 10, which is one of the two members (see FIG. 4(b)). As shown in the figure, when first divided piece 100A and second divided piece 100B are not compressed by case 10 and lid 20, a gap is formed between these end surfaces.

[0033] In this embodiment, when the case 10 and the lid 20 are fixed by the bolts 30, the curved portion 103 is deformed to become flat, and compressive strain is generated in the segments (first segment 100A and second segment 100B). As a result, the portions on both sides of the notch 102 on the end faces of the adjacent segments (first segment 100A and second segment 100B) come into contact with each other (see FIG. 4(c)). Note that in FIG. 4(c), the bolts 30 are omitted so that the state of the split gasket 100 can be easily understood when the case 10 and the lid 20 are fixed by the bolts 30.

[0034] The split gasket 100X according to this embodiment configured as described above can also achieve the same effect as in Example 1. In addition, in this embodiment, since the split pieces are provided with the curved portions 103, when the split pieces are installed on one of the two members (the case 10), a sufficient gap is secured between the end faces of the adjacent split pieces. Therefore, the work of installing a plurality of split pieces is easy. On the other hand, when the split pieces are compressed by the two members, the curved portions 103 are deformed into a flat plate shape, so that the end faces of the adjacent split pieces can be more reliably brought into contact with each other even if the amount of compressive strain is set to be small. That is, in the process in which the curved portions 103 are deformed into a flat plate shape, the end faces of the adjacent split pieces come closer to each other, so that these end faces can be more reliably brought into contact with each other even if the amount of compressive strain is small. Thus, in this embodiment, the compressive strain of the split pieces and the curved portions 103 being deformed into a flat plate shape work together to more reliably bring the end faces of the adjacent split pieces into contact with each other.

[0035] (others) In the above embodiment, the planar shape of the split gasket (planar shapes of the inner and outer circumferential surfaces) is generally rectangular, but the planar shape of the split gasket of the present invention is not limited to this. For example, the planar shape may be circular or elliptical, or various other shapes may be adopted depending on the location where the split gasket is used. [Explanation of symbols]

[0036] 10: Case 11: Storage unit 12: Female thread 20: Lid 21: Recess 22:Through hole 30: Bolt 100,100X: Split gasket 100A: 1st division piece 100B: 2nd divided piece 101: Hole 102:Notch 103: Curved section 110: Gasket body 120: Elastic body 130: Base treatment layer

Claims

1. A split gasket comprising a plurality of split pieces each having at least a plate-like metal gasket body, and being arranged between two members in a state where the end faces at both ends of adjacent said split pieces are in contact with each other, thereby sealing the gap between the end faces of said two members, notches for forming holes through which the shaft portions of bolts for fixing said two members are inserted are respectively provided at both ends of said split pieces, and a split gasket characterized in that, due to the compressive strain generated in said split pieces when said two members are fixed by said bolts, portions on both sides of said notch among the end faces of said split pieces in adjacent said split pieces come into contact with each other.

2. The split gasket according to claim 1, wherein curved portions that curve toward one of said two members and become flat by being compressed by said two members are respectively provided at least at portions where said split pieces come into contact with each other, said curved portions curving toward one of said two members when not under an external force.

3. The split gasket according to claim 2, wherein both of the curved portions provided at both ends of said split pieces curve toward one of said two members.

4. The split gasket according to claim 2 or 3, wherein the curved portion is provided over the entire end of said split piece.

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