JP2021060097A - gasket - Google Patents

Abstract

To eliminate the need of considering the damage of rubber or a substrate for forming a retainer.SOLUTION: A gasket 1 is equipped with a substrate body 11 that is formed of a substrate 2 and is a part formed so as to contact with joint surfaces that are opposite surfaces of two structures, and retainer portions 21 and 22 that are formed by bending the substrate 2 from a part of an edge on an outer peripheral side of the substrate body 11, and are parts extending from the substrate body 11. The retainer portions 21 and 22 are respectively provided with rivets 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to gaskets.

Conventionally, for example, in a joint portion between an engine cylinder head and an intake pipe or an exhaust pipe, a gasket made of an elastic metal substrate has been used in order to improve the sealing performance between the joint surfaces. Some of such gaskets are provided with a retainer portion which is a claw-shaped protrusion formed so as to be able to hold the attachment object in order to facilitate assembly to the attachment object. The retainer portions are provided so as to face each other, and rise from the edge portion of the substrate main body, and a protruding portion protruding inward is formed. By sandwiching the mounting target between the opposing protrusions, the gasket is fixed to the mounting target (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 11-248000

In order to increase the holding force of the protruding portion of the retainer portion described above, it is necessary to increase the protruding height, which is the amount of protrusion of the protruding portion. Since the protruding portion is press-molded in the same manner as the bead formed to improve the sealing performance, the rubber applied to the substrate when the substrate is greatly deformed in order to increase the protruding height of the protruding portion. There is a concern that the substrate may break or the substrate may crack. Therefore, in order to increase the protruding height of the protruding portion without significantly deforming the substrate, it is necessary to widen the width of the protruding portion, and in a gasket having a conventional retainer, in order to widen the width of the protruding portion, The length of the retainer portion in the extending direction is increased.

As described above, in the design of the conventional gasket having the retainer portion, it is necessary to consider the damage of the rubber and the substrate during the molding of the protruding portion.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a gasket that does not need to consider damage to rubber or a substrate for forming a retainer portion.

In order to achieve the above object, the gasket according to the present invention is a gasket formed from a substrate and seals between the opposing surfaces of the two structures, and is in contact with the opposing surfaces of the two structures. A substrate main body that is a possibly formed portion, and at least two retainer portions that are formed by bending the substrate from a part of the outer peripheral edge of the substrate main body and extending from the substrate main body. The retainer portion is provided with a rivet.

In the gasket according to one aspect of the present invention, the rivet is attached to the retainer portion so that the head of the rivet is located on the substrate main body side.

In the gasket according to one aspect of the present invention, two retainer portions are provided, and the two retainer portions are arranged at positions facing each other on the outer peripheral edge of the substrate main body.

In the gasket according to one aspect of the present invention, the substrate is a metal substrate whose surface is coated with an elastic body.

In the gasket according to one aspect of the present invention, the substrate has a multilayer structure in which at least two or more plate-like bodies are laminated.

According to the gasket according to the present invention, it is possible to eliminate the need to consider damage to the rubber or the substrate for forming the retainer portion.

It is a perspective view which shows the schematic structure of the gasket which concerns on embodiment of this invention. It is a developed view which shows the substrate of the gasket shown in FIG. 1 in the state where the retainer part is expanded. It is sectional drawing in the AA cutting line of FIG. 1 which shows the vicinity of the retainer part enlarged. It is a figure which shows the gasket in the temporarily assembled state.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a schematic structure of the gasket 1 according to the embodiment of the present invention, and FIG. 2 shows a substrate 2 of the gasket 1 shown in FIG. 1 in a state where the retainer portions 21 and 22 are deployed. It is a development view. Further, FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1 in which the vicinity of the retainer portions 21 and 22 is enlarged and shown.

The gasket 1 according to the embodiment of the present invention is used, for example, to seal between the cylinder head of the engine as two structures and the joint surface which is the opposite surface of the exhaust pipe.

The gasket 1 is formed from the substrate 2, and is a portion formed so as to be in contact with a joint surface which is an opposite surface of the two structures, and a part of the outer peripheral side edge of the substrate main body 11. It is provided with a retainer portion, which is a portion formed by bending the substrate 2 from the substrate 2 and extending from the substrate main body 11. The gasket according to the present invention includes at least two retainer portions, and the gasket 1 includes two retainer portions 21 and 22. The retainer portions 21 and 22 are provided with rivets 30 respectively.

The substrate 2 may have a single-layer structure formed from one substrate, or may have a multilayer structure in which two or more plate-like bodies formed from two or more substrates are laminated. .. In the present embodiment, the substrate 2 has a three-layer structure in which three plate-like bodies are laminated, and the substrates 2a, 2b, and 2c, which are thin metal plates, are laminated and formed. There is. In the substrate 2, as shown in FIG. 3, the substrate 2c is an intermediate layer, and the substrate 2c is sandwiched between the substrates 2a and the substrates 2b. The substrates 2a, 2b, 2c are, for example, an elastic metal plate such as a stainless steel plate, and the surface thereof is coated with an elastic body such as rubber or resin. Examples of the elastic body that covers the substrates 2a to 2c include a special rubber having heat resistance and a molybdenum disulfide-containing tree. Examples of the special rubber include synthetic rubber containing at least one of nitrile rubber, styrene-butadiene rubber, fluororubber, acrylic rubber, and silicon rubber. The surface of the substrate 2c as an intermediate layer does not have to be coated with an elastic body, and the substrates 2a and 2b as an outer layer are coated with an elastic body only on one surface facing the outside, not on both sides. It may have been done.

The substrate main body 11 has a shape corresponding to a joint surface which is an opposing surface between the cylinder head and the exhaust pipe as two structures, and is defined by, for example, edges s1, s2 and edges s3 and s4. It has a roughly diamond-shaped contour. Bolt holes 12, 13 and through holes 14 are formed in the substrate main body 11. The bolt holes 12 and 13 are through holes through which bolts for fixing the gasket 1 are inserted when the gasket 1 is arranged between the cylinder head and the exhaust pipe and fixed to the cylinder head and the exhaust pipe. Further, the through hole 14 is a through hole for passing a fluid, and forms a hole corresponding to an exhaust pipe line communicating between the cylinder head and the exhaust pipe in the engine. In the substrate main body 11, the bolt holes 12 and 13 are formed outside the through holes 14. Further, a bead (not shown) that contacts the joint surface of the cylinder head and the joint surface of the exhaust pipe is formed around the through hole 14 of the substrate main body 11. That is, beads protruding outward are formed on the substrates 2a and 2b, respectively.

In the retainer portions 21 and 22, the portion of the substrate 2 protruding outward left on a part of the outer peripheral edge including the four edges s1 to s4 of the substrate main body 11 is bent from the outer peripheral edge to the substrate 2a side or the substrate 2b side. It is a part formed by being formed (see FIGS. 1 and 2). The retainer portions 21 and 22 are formed so as to project from the substrate main body 11 toward the substrate 2a side or the substrate 2b side, and extend in a direction orthogonal to or substantially orthogonal to the spreading direction of the substrate main body 11, for example. (See FIG. 3).

The retainer portions 21 and 22 have, for example, a rectangular or substantially rectangular contour, and are a part of the substrate 2 formed by laminating the substrates 2a, 2b, and 2c. As will be described later, the retainer portions 21 and 22 extend from the substrate main body 10 so that, for example, the side wall surface of the cylinder head is sandwiched between them and the gasket 1 is temporarily assembled to the cylinder head. The shape of the retainer portions 21 and 22 does not have to be a shape that forms a rectangular or substantially rectangular contour, and may be another shape that forms a contour such as another rectangle, a triangle, or a circle.

The retainer portions 21 and 22 are provided, for example, on the two edges s1 and s4 facing each other among the four edges s1 to s4 of the substrate main body 11, respectively. Further, the retainer portions 21 and 22 are arranged so as to be symmetrical or substantially symmetrical with respect to the through hole 14. As a result, the retainer portions 21 and 22 can hold the side wall surface of the cylinder head in a well-balanced manner in the temporarily assembled state described later.

Through holes 25 and 26 for rivets for inserting the rivet 30 are provided in the center or substantially the center of the retainer portions 21 and 22, respectively (see FIG. 2). The body portion 31 of the rivet 30 is inserted into the rivet through holes 25 and 26 of the retainer portions 21 and 22 from the inside to the outside of the substrate main body 11, and the end portion 31a of the body portion 31 that is not on the head 32 side is inserted. Is fixed to the retainer portions 21 and 22 by being plastically deformed so as to spread to the outer peripheral side by caulking or the like. The rivet 30 is attached to the retainer portions 21 and 22 so that the head 32 of the rivet 30 faces inward, and the head 32 of the rivet 30 faces each other through the through hole 14 in the substrate main body 11. It has become.

In the gasket 1, as shown in FIG. 3, the head portion 32 of the rivet 30 protrudes from the surfaces 21a and 22a of the retainer portions 21 and 22 by a predetermined height h. That is, the rivet 30 forms a protrusion protruding from the surfaces 21a and 22a of the retainer portions 21 and 22 by the height h of the head 32 of the rivet 30. Therefore, the protrusion amount (height h) of the protrusions of the retainer portions 21 and 22 is set by selecting or adjusting the height of the head 31 of the rivet 30. Although the rivet 30 is made of metal, it may be made of resin. When the resin rivet 30 is used, the rivet 30 is fixed to the retainer portions 21 and 22 by melting and deforming the end portion 31a of the body portion 31.

The rivet 30 may be fixed to the retainer portions 21 and 22 so that the head 32 faces outward. In this case, the end portion 31a of the body portion 31 deformed by caulking or the like becomes the protruding portion of the retainer portions 21 and 22. The predetermined height h from the surfaces 21a and 22a of the retainer portions 21 and 22 of the protruding portion can be arbitrarily adjusted depending on the deformation mode of the end portion 31a of the body portion 31. Further, a plurality of rivets 30 may be provided in each of the retainer portions 21 and 22.

The rivets 30 of the retainer portions 21 and 22 also function as protruding portions for temporarily fixing the gasket 1 described later, and also as a fixture for fixing the laminated substrates 2a to 2c of the substrates 2 having a laminated structure to each other. Also works. The rivet 30 may be attached to the substrate 2 in the unfolded state shown in FIG. 2, or may be attached to the substrate 2 in a state in which the retainer portions 21 and 22 are bent.

As described above, in the gasket 1 according to the embodiment of the present invention, the retainer portions 21, 22 are formed instead of forming the protrusion portion by deforming the retainer portion itself by press molding like a gasket having a conventional retainer portion. A rivet 30 was provided on the surface to form a protruding portion. Therefore, unlike the conventional case, it is not necessary to create the retainer portion in consideration of damage to the rubber or the substrate, such as increasing the length of the retainer portion in the extending direction in order to form the protrusion portion.

As described above, according to the gasket according to the embodiment of the present invention, it is possible to eliminate the need to consider damage to the rubber and the substrate 2 (2a to 2c) for forming the retainer portions 21 and 22.

Further, since the retainer portions 21 and 22 are not damaged as described above when the protruding portions (rivets 30) of the retainer portions 21 and 22 are formed, the gasket 1 improves the yield of the manufactured gasket 1. Can be made to.

Further, when the substrate has a multilayer structure like the substrate 2, the rivets 30 of the retainer portions 21 and 22 also function as a substrate fixing member for fixing the laminated substrates 2a to 2c. Therefore, unlike the conventional gasket, it is not necessary to provide a substrate fixing member such as a rivet on the substrate main body, and the structure and manufacture of the gasket can be simplified. Further, in the gasket 1, it is not necessary to provide a board fixing member on the board body 11, and it is not necessary to consider interference between the joint surface to be mounted and the board fixing member, and the gasket 1 is highly versatile. ing.

Further, according to the gasket 1, the holding force of the retainer portions 21 and 22 can be adjusted according to the form of the rivet 30, regardless of the shape such as the length of the retainer portions 21 and 22, and the holding force of the retainer portion can be adjusted. Can be facilitated.

Further, as will be described later, the gasket 1 is temporarily assembled to the mounting target by the rivet 30 sandwiching the mounting target. Therefore, during temporary assembly, it is possible to prevent the elastic body such as rubber coated on the substrate 2 from coming into contact with the mounting target or rubbing the mounting surface, and the elastic body such as rubber is on the surface of the mounting target. It is possible to eliminate scraping due to roughness and the like. As a result, it is possible to prevent the generation of elastic body pieces such as scraped rubber pieces, which are foreign substances, during temporary assembly. Such foreign matter may be caught between the substrate and the mounting target during assembly, and in this case, the sealing performance of the gasket is deteriorated. As described above, since the gasket 1 can eliminate the generation of foreign matter during temporary assembly, it is possible to eliminate the deterioration of the sealing performance of the gasket 1 due to the foreign matter.

Next, the operation of the gasket 1 having the above-described configuration will be described.

FIG. 4 is a diagram showing the gasket 1 in the temporarily assembled state. As shown in FIG. 4, in the temporarily assembled state in the assembling process of the cylinder head 100 and the exhaust pipe 110 as two structures, the gasket 1 is assembled to one of the cylinder head 100 or the exhaust pipe 110 to be attached. There is. In the illustrated example, the gasket 1 is assembled to the cylinder head 100 and is in a temporarily assembled state, but the gasket 1 may be assembled to the exhaust pipe 110 and is in a temporarily assembled state.

In the temporarily assembled state, as shown in FIG. 4, the substrate main body 11 is in contact with the joint surface 102 of the cylinder head 100 in a state where the retainer portions 21 and 22 sandwich the side wall 101 of the cylinder head 100. The distance between the rivets 30 of the retainer portions 21 and 22 is narrower than the width of the side wall 101 of the cylinder head 100, and the rivets 30 in contact with the side wall 101 push the retainer portions 21 and 22 outward, and the rivets 30 Is pressed against the side wall 101. As described above, the height h of the rivet 30 is a value for adjusting the holding force of the retainer portions 21 and 22.

As described above, in the temporarily assembled state, the gasket 1 can be fixed to the cylinder head 100 by sandwiching the retainer portions 21 and 22 in a state where the substrate main body 11 is in contact with the joint surface 102 of the cylinder head 100. The exhaust pipe 110 can be easily attached to the vehicle.

To attach the exhaust pipe 110 to the cylinder head 100, as shown by a broken line in FIG. 4, the joint surface 111 of the exhaust pipe 110 is brought into contact with the substrate main body 11 of the gasket 1 in the temporarily assembled state, and the bolt 120 is used to attach the exhaust pipe 110 to the cylinder head 100. This is done by fixing the exhaust pipe 110. As a result, the substrate body 11 of the gasket 1 is pressed between the joint surface 102 of the cylinder head 100 and the joint surface 111 of the exhaust pipe 110, and the joint surface 102 and the joint surface 111 are sealed.

Although the embodiment of the present invention has been described above, the present invention is not limited to the gasket 1 according to the above-described embodiment, and includes all aspects included in the concept of the present invention and the scope of claims. In addition, each configuration may be selectively combined as appropriate so as to achieve at least a part of the above-mentioned problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiment can be appropriately changed depending on the specific usage mode of the present invention.

As described above, as an embodiment of the present invention, the gasket 1 used at the joint between the cylinder head of the engine and the exhaust pipe has been described, but the application target (mounting target) of the present invention is not limited to this, and the present invention is not limited to this. The gasket according to the above can be used for various things such as automobiles, ships, airplanes, general industrial machines and the like.

1 ... Gasket, 2,2a, 2b, 2c ... Substrate, 11 ... Substrate body, 12, 13 ... Bolt hole, 14 ... Through hole, 21,22 ... Retainer part, 21a, 21b ... Surface, 25, 26 ... For rivets Through hole, 30 ... rivet, 31 ... body, 31a ... end, 32 ... head, cylinder head ... 100, side wall ... 101, joint surface ... 102, exhaust pipe ... 110, joint surface ... 111, s1 to s4 ... Edge, h ... height

Claims (5)

A gasket formed from a substrate that seals between the opposing surfaces of two structures.
A substrate body, which is a portion formed so as to be in contact with the opposing surfaces of the two structures,
It is provided with at least two retainer portions which are portions extending from the substrate body, which are formed by bending the substrate from a part of the outer peripheral edge of the substrate body.
A gasket characterized in that a rivet is provided in the retainer portion. The gasket according to claim 1, wherein the rivet is attached to the retainer portion so that the head of the rivet is located on the substrate main body side. The gasket according to claim 1 or 2, wherein two retainer portions are provided, and the two retainer portions are arranged at positions facing each other on the outer peripheral edge of the substrate main body. The gasket according to any one of claims 1 to 3, wherein the substrate is a metal substrate whose surface is coated with an elastic body. The gasket according to any one of claims 1 to 4, wherein the substrate has a multilayer structure in which at least two or more plate-like bodies are laminated.

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