JP2009191870A - Metal gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal gasket to be sandwiched between two members for sealing, more specifically, a metal gasket capable of efficiently using a thrust force of sandwiching the gasket to generate sealing face pressure and demonstrating excellent sealing performance. <P>SOLUTION: In the metal gasket 1, 1A having one or two or more metal constituent plates 10, surface thickness increasing members 12a, 13a are arranged at the peripheral portions of all sealing holes 2 and all bolt holes 3 on at least one surface of at least one metal constituent plate 10. On this surface, this metal constituent plate 10 gets into contact the other metal constituent plate of this gasket 1 or one of the members sandwiching the gasket 1 with the surface pressure increasing members 12a, 13a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a metal gasket that is sandwiched between two members for sealing, and more specifically, a pressing force sandwiching the gasket can be efficiently used for generating a seal surface pressure, and exhibits excellent sealing performance. The present invention relates to a metal gasket.

  Metal gaskets such as engine manifold gaskets are fastened by bolts in a state of being sandwiched between two members such as a cylinder block (cylinder body) of an automobile engine and an exhaust pipe or an intake pipe. Has the role of sealing the fluid.

  Recent engines are becoming smaller and lighter than conventional engines, and the material changes from cast iron to aluminum alloy, and the combustion gas pressure tends to increase as the engine output increases. . On the other hand, from the viewpoint of reducing the weight of the engine, the number of metal component plates that can be used for the gasket is decreasing, and it is necessary to exhibit high sealing performance with a small number of metal component plates.

  On the other hand, as one of the metal gaskets, the metal plate is folded around the hole to be sealed to form a flange portion around the hole, and the metal plate is placed on either side of the outer peripheral edge of the flange portion. A metal with a wide seal portion formed by forming a rising portion by bulging, and forming a ring-shaped sealing portion in which the embossed portion formed between the rising portion and the folded portion is substantially parallel to the flange portion A gasket has been proposed (see, for example, Patent Document 1).

  In this metal gasket with a wide seal portion, the folded portion prevents the combustion gas from entering between the laminated plates, and the flange of the embossed portion and the folded portion is widened to prevent deformation of the sealing target member due to the sealing pressure. .

However, in this metal gasket with a wide seal portion, a surface pressure adjusting plate, which is a metal plate different from the metal plate provided with the folded portion, is arranged in a stacked manner to adjust the step due to the thickness of the flange portion. For this reason, the gasket comes into contact with other metal plates and members with the flange portion and the surface pressure adjusting plate, and the pressing force sandwiching the gasket is distributed to the flange portion and the surface pressure adjusting plate at the peripheral portion of the hole to be sealed. ing. For this reason, the pressing force acts on the surface pressure adjusting plate other than the seal surface pressure, so that there is a problem that the seal surface pressure remains small.
Japanese Utility Model Publication No. 02-43559

  The present invention has been made in view of the above-described situation, and an object of the present invention is to generate a seal surface pressure by using a pressing force for sandwiching a gasket in a metal gasket that is sandwiched between two members for sealing. It is an object of the present invention to provide a metal gasket that can be used efficiently and exhibit excellent sealing performance.

  In order to achieve the above object, the metal gasket according to the present invention is a metal gasket having one or more metal component plates, and all the objects to be sealed on at least one surface of at least one metal component plate. A surface thickness increasing member is arranged at the peripheral edge of the hole and all the bolt holes. On this surface, the metal component plate sandwiches another metal component plate of the gasket or the gasket with the surface pressure increasing member. It is comprised so that it may contact | abut to one member of a member.

  According to this configuration, the surface thickness increasing member whose surface thickness is further increased than the gasket surface abuts against another metal component plate or one member, so that the pressing force acting on the gasket is compared with the entire gasket surface. In other words, it acts on the surface thickness increasing member having a small total area, so that almost all of the pressing force can be concentrated on the periphery of the seal target hole and the bolt hole. Therefore, since a large seal surface pressure can be obtained, the sealing performance increases.

  Said metal gasket WHEREIN: The said surface thickness increase member is formed and formed by the flange part of the folding | turning part of a metal structure board. According to this configuration, it is possible to easily form the surface thickness increasing member having the same thickness, and to make the step difference between the peripheral portion of the hole to be sealed and the peripheral portion of the bolt hole due to the surface thickness increasing member the same. Thereby, a gasket can be maintained in parallel with another metal component board and member, and distortion of a gasket can be prevented.

  Further, the folded portion can prevent fluid such as combustion gas from entering between the metal component plate and the surface thickness increasing member (flange portion of the folded portion). Furthermore, since only the folding step is required at the folded portion, processing is facilitated and an increase in the number of metal constituent plates can be suppressed.

  Said metal gasket WHEREIN: All the said surface thickness increase members are formed and formed by the flange part of the folding | turning part of a metal structure board. According to this configuration, all the surface thickness increasing members can be easily formed to the same thickness, and the step by the surface thickness increasing member at the peripheral portion of the hole to be sealed and the peripheral portion of the bolt hole can be made the same. it can. Thereby, a gasket can be maintained in parallel with another metal component board and member, and distortion of a gasket can be prevented. Further, only the folding process is performed, and the bonding process is not necessary for the adhesive or spot welding of the surface thickness increasing member, which facilitates processing and avoids an increase in the number of metal constituent plates.

  As the surface thickness increasing member, not only the flange portion of the folded portion of the metal component plate but also a shim that is a metal plate different from the metal component plate can be used. When this shim is used, it can be made of a material different from that of the metal component plate, so that finer adjustment of the seal surface pressure and optimization of the contact surface can be achieved, compared with the metal component plate. The use of soft and soft metal can suppress the occurrence of scratches on the member side.

  Said metal gasket WHEREIN: A full bead or a half bead is provided in the metal structural board on the opposite side of the said surface thickness increasing member, and is comprised. According to this configuration, the sealing performance can be further improved since the sealing line can be configured on the other surface by these sealing means.

  According to the metal gasket of the present invention, the surface thickness increasing member whose surface thickness is further increased from the gasket surface is in contact with another metal component plate or member, so that the pressing force acting on the gasket is applied to the entire gasket surface. Compared with the surface thickness increasing member having a smaller total area, almost all of the pressing force can be concentrated on the peripheral portions of the seal target hole and the bolt hole. Therefore, since a large seal surface pressure can be obtained, the sealing performance can be improved.

  Next, an embodiment of a metal gasket according to the present invention will be described with reference to the drawings, taking a manifold gasket as an example. 1 to 3 are schematic explanatory diagrams, and in order to make the configuration easier to understand, dimensions such as a plate thickness, a size of a hole to be sealed, a size of a folded portion, and a size of a bead are shown. It is exaggerated, different from the actual one.

  A metal gasket according to an embodiment of the present invention is a manifold gasket sandwiched between an engine cylinder block (cylinder body) and an exhaust pipe or an intake pipe, and seals fluid such as exhaust gas and intake air.

  This manifold gasket includes one or more metal component plates (metal substrates) formed of a mild steel plate, a stainless annealed material (annealed material), a stainless tempered material (spring steel plate), or the like. In addition, the shape in plan view is manufactured to approximately match the shape of the manifold of the engine, and a hole to be sealed 2 through which combustion gas or intake air passes and a bolt hole 3 for fastening bolts are formed.

  As shown in FIGS. 1 and 2, the manifold gasket 1 according to the first embodiment of the present invention includes a single metal component plate 10, and the metal component plate 10 is formed of, for example, a stainless annealed material. The A full bead 11 is provided on the metal component plate 10 at the peripheral edge of the sealing target hole 2, and a folded portion 12 is further provided. The flange portion 12 a of the folded portion 12 is disposed on the surface opposite to the full bead 11. And it is comprised so that the outer peripheral edge part of this flange part 12 may become the outer side rather than the full bead 11 in plan view, in other words, the full bead 11 may be settled inside the flange part 12. FIG.

  Further, a folded portion 13 is also provided at the peripheral portion of the bolt hole 3, and the flange portion 13 a is provided on the same surface as the flange portion 12 a of the folded portion 12. These flange portions 12a and 13a constitute a surface thickness increasing member.

  According to the manifold gasket 1 of the first embodiment, an engine such as an engine block or an exhaust pipe (or intake pipe) is provided at the surface thickness increasing members 12a and 13a whose thickness is further increased from the gasket surface. The pressing force acting on the manifold gasket 1 acts on the surface thickness increasing members 12a and 13a whose total area is smaller than that of the entire gasket surface because it abuts against the member, and almost all of the pressing force is applied to the seal target hole. 2 and the periphery of the bolt hole 3 can be concentrated. Therefore, since a large seal surface pressure can be obtained, the sealing performance increases.

  Furthermore, since the surface thickness increasing members 12a and 13a are formed by the flange portions 12a and 13a of the folded portions 12 and 13 of the metal component plate 10, the surface thickness increasing members 12a and 13a having the same thickness are easily formed. It is possible to make the thickness (step) of the peripheral portion of the sealing target hole 2 and the peripheral portion of the bolt hole 3 by the surface thickness increasing members 12a and 13a the same. Thereby, since the manifold gasket 1 can be maintained parallel to the engine member, distortion of the manifold gasket 1 can be prevented.

  Further, the folded portions 12 and 13 can prevent fluid such as combustion gas from entering between the metal component plate 10 and the surface thickness increasing members 12a and 13a (the flange portions 12a and 13a of the folded portions 12 and 13). Furthermore, only the folding process is performed at the folded sections 12 and 13, and an adhesive process such as an adhesive or spot welding is not required as in the case where a shim is adopted. Can be avoided.

  The manifold gasket 1A according to the second embodiment of the present invention shown in FIGS. 1 and 3 is configured by providing a half bead 11A instead of the full bead 11 of the first metal component plate 10 in the first first embodiment. Is done.

  According to this configuration, since the seal surface pressure is generated with the partial half bead 11A wider than the full bead 11, excellent sealing performance can be exhibited without causing deformation of the engine member.

  According to the metal gaskets (manifold gaskets) 1 and 1A having the above configuration, the surface thickness increasing members 12a and 13a whose surface thickness is further increased than the gasket surface are in contact with other metal constituent plates or members. The pressing force acting on the gaskets 1 and 1A acts on the surface thickness increasing members 12a and 13a whose total area is small compared to the entire gasket surface, and almost all of the pressing force is applied to the seal target hole 2 and the bolt hole 3. It can be concentrated on the peripheral edge. Therefore, since a large seal surface pressure can be obtained, the sealing performance can be improved.

It is a top view which shows the manifold gasket of the 1st and 2nd embodiment of this invention. It is a fragmentary sectional view which shows the AA cross section of FIG. 1 of the manifold gasket of the 1st Embodiment of this invention. It is a fragmentary sectional view which shows the AA cross section of FIG. 1 of the manifold gasket of the 2nd Embodiment of this invention.

Explanation of symbols

1,1A Manifold gasket (metal gasket)
2 Hole to be sealed 3 Bolt hole 10 Metal component plate 11 Full bead 11A Half bead 12, 13 Folded part 12a, 13a Folded part flange (surface thickness increasing member)

Claims (4)

  In the metal gasket having one or two or more metal component plates, a surface thickness increasing member is provided on the peripheral portion of all the sealing target holes and all the bolt holes on at least one surface of at least one metal component plate. In this one surface, the metal component plate is configured to abut against another member of the gasket or one of the members sandwiching the gasket with the surface pressure increasing member. Metal gasket.   2. The metal gasket according to claim 1, wherein the surface thickness increasing member is formed by a flange portion of a folded portion of a metal component plate.   The metal gasket according to claim 2, wherein all of the surface thickness increasing members are formed by a flange portion of a folded portion of a metal component plate.   4. The metal gasket according to claim 1, wherein a full bead or a half bead is provided on a metal component plate opposite to the surface thickness increasing member.

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