WO2019073695A1

WO2019073695A1 - Gasket

Info

Publication number: WO2019073695A1
Application number: PCT/JP2018/030861
Authority: WO
Inventors: 晃司神谷
Original assignee: Nok株式会社
Priority date: 2017-10-11
Filing date: 2018-08-21
Publication date: 2019-04-18

Abstract

Provided is a gasket wherein corrosion caused by salt water, etc., and occurring near the seal line of a metal member which grips and presses the gasket can be suppressed. This gasket (1) is contained in a groove (31) formed in a metal member (30), is gripped between the metal member (30) and a resin member (40), and seals between the metal member (30) and the resin member (40). The gasket (1) is provided with a base (11) and a protrusion (12), the protrusion (12) extending in the direction in which the base (11) extends and protruding from the non-sealed side of the base (11). The protrusion (12) is adapted to be in contact with the groove (31).

Description

gasket

The present invention relates to a gasket, and more particularly to a gasket used in a vehicle, a general purpose machine, and the like.

In vehicles and general-purpose machines such as automobiles, gaskets are used to seal a housing in an engine, a device that houses electronic components, and the like. The gasket is elastically deformed, for example, by being pinched in a compressed state between a pair of members which are combined to form a housing, thereby sealing the pair of members and sealing the housing (for example, a patent) Literature 1).

Japanese Utility Model Application Publication No. 4-97162

Automobiles may travel along the beach area or in areas where snow melting agents are dispersed. At this time, salt water or snow melting agents adhere to automobile parts, and salt water or snow melting agents intrude into the gaps between the members sandwiching the gasket. May stagnate. The stagnant salt water or snow melting agent may cause corrosion on the metal member holding the gasket. When this corrosion extends beyond the sealing line of the gasket, the sealing function of the gasket is degraded.

As described above, in order to suppress the deterioration of the sealing function of the gasket, it is preferable that the vicinity of the seal line of the metal member sandwiching the gasket is not corroded by salt water or a snow melting agent etc. A structure for suppressing corrosion in the vicinity of a seal line of a member has been conventionally required.

This invention is made in view of the above-mentioned subject, The objective is to provide the gasket which can aim at suppression of the corrosion by the salt water etc. of the seal line vicinity of the metal member which clamps a gasket.

In order to achieve the above object, the gasket according to the present invention is housed in a groove formed in a metal member, and is sandwiched between the metal member and a resin member, the metal A gasket for sealing between a member and the resin member, the gasket comprising: a base; and a protrusion extending along the extension direction of the base and protruding from the non-sealing side of the base, The projection is characterized in that it is in contact with the groove.

In the gasket according to one aspect of the present invention, the base is accommodated in the groove and is compressed between the metal member and the resin member.

In the gasket according to one aspect of the present invention, the base has a groove bottom contact portion contacting the groove bottom of the groove, and a resin contact portion contacting the resin member, and the protrusion is It is provided between the groove bottom contact portion and the resin contact portion.

In the gasket according to one aspect of the present invention, the base is formed in an annular shape, and the projection extends over the entire circumference of the base.

According to the gasket according to the present invention, it is possible to suppress corrosion due to salt water or the like in the vicinity of the seal line of the metal member sandwiching the gasket.

It is a top view for showing the schematic structure of the gasket concerning an embodiment of the invention. FIG. 2 is a cross-sectional view of the gasket shown in FIG. 1 taken along a line AA and a cross section orthogonal to the extension direction of the gasket. It is a fragmentary sectional view which shows the appearance of the gasket shown in FIG. 1 in an attachment state.

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

FIG. 1 is a plan view showing a schematic structure of the gasket 1 according to the embodiment of the present invention, and FIG. 2 is orthogonal to the extending direction of the gasket 1 along line AA of the gasket 1 shown in FIG. 3 is a partial cross-sectional view showing the state of the gasket 1 shown in FIG. 1 in an attached state. The gasket 1 is used for vehicles, general-purpose industrial machines, etc., and is pressed between two members to be elastically deformed, and used to seal between the two members. For example, in an engine or the like, the gasket 1 is pressed between two members forming a housing to seal the housing. In FIGS. 1 and 2, the gasket in the free state is illustrated, which is not clamped between the members.

As described later with reference to FIG. 3, the gasket 1 according to the present embodiment is accommodated in the groove 31 formed in the metal member 30, and is between the metal member 30 and the resin member 40. It is for pinching and sealing between the metal member 30 and the resin member 40. Further, as shown in FIGS. 1 and 2, the gasket 1 includes a base 11 and a protrusion 12 which extends along the extension direction of the base 11 and protrudes from the non-sealing side of the base 11. It is in contact with the groove 31. For example, the base 11 is formed in an annular shape, and the projection 12 extends around the entire circumference of the base 11.

Here, the sealed side is the side of the space to be sealed, and the non-sealed side is the side opposite to the side to be sealed, for example, the atmosphere side. In the gasket 1 according to the present embodiment, as shown in FIGS. 1 and 2, the closed space side (inside side) surrounded by the annular gasket 1 is the sealing side, and the non-sealing side is the inside side It is the other side of the other side. Further, for convenience of description, in FIG. 2, the upper side is the upper side, and the lower side is the lower side.

The base 11 is accommodated in the groove 31 and is compressed between the metal member 30 and the resin member 40. Further, the base 11 has a groove bottom contact portion 11b in contact with the groove bottom 31b of the groove 31 and a resin contact portion 11a in contact with the resin member 40, and the projection 12 is a groove bottom contact portion It is provided between 11b and the resin contact part 11a.

Specifically, as shown in FIG. 2, the base 11 is formed such that a cross section along the line AA (hereinafter, also simply referred to as a cross section) forms a substantially circular shape, and in the attached state described later A resin contact portion 11a which is a portion which forms a seal line S1 of a predetermined width in contact with a member 40 made of resin, and a groove which is a portion which forms a seal line S2 of a predetermined width in contact with a groove bottom 31b A bottom contact portion 11b and a seal side groove wall contact portion 11c which is a portion in contact with the seal side groove wall 31c are provided. The thickness T1 (the width between the resin contact portion 11a and the groove bottom contact portion 11b in the free state of the gasket 1) in the cross section of the base 11 is constant or substantially constant in the extension direction. The thickness T1 is set larger than the groove depth D of the groove 31 in the free state of the gasket 1. The cross section of the base 11 is not limited to a substantially circular shape, and may be, for example, a rectangular shape.

Specifically, as shown in FIG. 2, the protruding portion 12 protrudes from the portion on the outer side (non-sealed side) of the base 11 by a predetermined protruding length L toward the outer side. The projecting portion 12 has a non-sealing side groove wall contact portion 12a which is a portion forming a predetermined seal line S3 in contact with the non-sealing side groove wall 31a of the groove 31 in an attached state described later. The tip of the protrusion 12 is convex toward the outside. That is, as shown in FIG. 2, the cross-sectional shape of the tip of the protrusion 12 forming the non-sealing side groove wall contact portion 12a forms a curved surface or a V-shaped surface convex toward the outside. In addition, as shown in FIG. 2, the projection length L is between the base portion of the projection 12 and the outermost side of the non-sealing side groove wall contact portion 12 a in the inside and outside directions in the free state of the gasket 1. And a constant or substantially constant in the extending direction.

The protruding length L of the protruding portion 12 is set such that the non-sealing side groove wall contact portion 12a contacts the non-sealing side groove wall 31a in the mounting state described later. In the free state where the gasket 1 is accommodated in the groove 31 and not pressed between the metal member 30 and the resin member 40, the non-sealing side groove wall contact portion 12a is a non-sealing side groove It may be set so as not to contact the wall 31a, or may be set so that the non-sealing side groove wall contact portion 12a contacts the non-sealing side groove wall 31a.

The protrusion 12 is provided at a predetermined height h from the groove bottom contact portion 11 b of the base 11. The height h is, as shown in FIG. 2, the outermost part of the non-sealing side groove wall contact portion 12 a and the lowermost side of the groove bottom contact portion 11 b of the base 11 in the vertical direction in the free state of the gasket 1. And a constant or substantially constant in the extending direction. The height h is set to be smaller than the groove depth D of the groove 31 in the free state of the gasket 1. Further, even if the height h is set larger than the groove depth D of the groove 31 in the free state of the gasket 1, the groove depth D of the groove 31 is larger than the groove depth D of the groove 31 in the mounting state where the gasket 1 is compressed vertically. It may be set to be small. In the mounting state described later, the non-sealing side groove wall contact portion 12a of the protrusion 12 is a seal line on the upstream side in the penetration direction X of salt water etc. shown in FIG. 3 than the seal line S2 formed by the groove bottom contact portion 11b. S3 is formed.

The gasket 1 is made of an elastic body made of synthetic rubber. The synthetic rubber is a synthetic rubber containing at least one of nitrile rubber (NBR), styrene butadiene rubber (SBR), fluororubber (FKM), acrylic rubber (ACM), and silicone rubber.

Next, the operation of the gasket 1 will be described. Specifically, as shown in FIG. 3, the gasket 1 is held between the metal member 30 and the resin member 40 to be elastically deformed, and the metal member 30 and the resin member 40 are deformed. There is a seal between The metal member 30 and the resin member 40 are fastened with the flat surface 30a formed on the metal member 30 and the flat surface 40a formed on the resin member 40 facing each other, and the flat surface 30a and the flat surface are formed. The gasket 1 is pinched between itself and 40a to be elastically deformed. The metal member 30 and the resin member 40 are, for example, a cylinder head and cylinder head cover of an engine, a case of a fuel cell stack, and members forming the casing of other devices, and the

flat surfaces

30a and 40a are, for example, It is formed in the flange part formed in the member 30 made of metal, and the member 40 made of resin.

The gasket 1 is elastically deformed from the free state shown in FIG. 2 in the process of fastening the metal member 30 and the resin member 40, and the contact portion with the metal member 30 and the resin member 40 (seal The fastening operation is performed until the desired contact pressure is generated in the lines S1 to S3). Fastening is performed, for example, by screwing a bolt. As shown in FIG. 3, upon completion of the fastening operation, the gasket 1 is in the attached state, and the gasket 30 is clamped so as to seal between the plane 30a and the plane 40a with a desired sealing property. In the case of the present embodiment, three seal lines S1 to S3 are formed between the gasket 1 and the member 30 made of metal and the member 40 made of resin.

Specifically, in the resin contact portion 11a, the base 11 is pressed against the flat surface 40a of the resin member 40 with a pressure of a desired magnitude, and is in close contact with the flat surface 40a to form a seal line S1 of a desired width. A surface pressure of a desired magnitude is generated on the seal line S1. The base 11 is pressed against the groove bottom 31b with a pressure of a desired magnitude at the groove bottom contact portion 11b to form a seal line S2 of a desired width in close contact with the groove bottom 31b. A contact pressure of a desired magnitude is generated. Thereby, sealing between the metal member 30 and the resin member 40 is achieved.

Further, the protrusion 12 is pressed against the non-sealing side groove wall 31a with a pressure of a desired magnitude at the non-sealing side groove wall contact portion 12a to form a seal line S3 of a desired width in close contact with the non-sealing side groove wall 31a. In addition, a contact pressure of a desired magnitude is generated on the seal line S3. In order to form the seal line S3, it is preferable that the base 11 in the attached state is pressed against the sealing side groove wall 31c with a pressure of a desired magnitude at the sealing side groove wall contact portion 11c. The non-sealing side groove wall contact portion 12a is pressed against the non-sealing side groove wall 31a by the reaction force due to the contact between the sealing side groove wall contact portion 11c and the sealing side groove wall 31c, and the seal line S3 can be formed reliably. The non-sealing side groove wall contact portion 12a and the non-sealing side groove wall 31a and the sealing side groove wall contact portion 11c are not in contact with the sealing side groove wall 31c by the clamping force between the metal member 30 and the resin member 40. As long as the seal line S3 is formed between them, the base 11 in the attached state may not be in contact with the sealing side groove wall 31c at the sealing side groove wall contact portion 11c.

As described above, the groove bottom contact portion 11b of the gasket 1 forms the seal line S2 with the metal member 30 in the mounted state, and the resin contact portion 11a of the gasket 1 is made of resin A seal line S1 is formed between the two members 40 of FIG. In the mounted state, the gasket 1 generates a desired surface pressure at the seal lines S1 and S2, and sealing between the metal member 30 and the resin member 40 is properly achieved.

The gasket 1 according to the embodiment of the present invention is located upstream of the seal line S2 between the groove 31 and the groove bottom 31b in the intrusion direction X such as salt water, and between the non-sealing side groove wall 31a of the groove 31. Seal line S3 can be formed. Since the groove 31 is divided into the upper groove space R1 and the lower groove space R2 by the seal line S3 of the non-sealing side groove wall contact portion 12a, between the flat surface 30a and the flat surface 40a from the non-sealing side (external side) Even when salt water or the like intrudes into the upper groove space R1 after passing through the gap g, it is possible to suppress the salt water or the like from intruding further into the lower groove space R2. Thereby, retention of salt water etc. of seal line S2 vicinity of slot bottom contact part 11b can be controlled. Thus, the gasket 1 can suppress the occurrence of corrosion in the vicinity of the seal line S2 of the groove bottom contact portion 11b of the metal member 30 for clamping the gasket 1. In particular, since it is not necessary to take measures against corrosion on the surface of the metal member 30, in the case of an aluminum alloy such as the ADC 12 which is easily corroded by salt water etc., for example, the alumite treatment becomes unnecessary and the present embodiment The gasket 1 according to is preferred.

As described above, according to the gasket 1 according to the embodiment of the present invention, it is possible to suppress corrosion due to salt water or the like in the vicinity of the seal line S2 of the groove bottom contact portion 11b of the metal member 30 sandwiching the gasket 1. it can.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the gasket 1 which concerns on the said embodiment of this invention, It includes all the aspects contained in the concept of this invention, and a claim. . In addition, the respective configurations may be selectively combined as appropriate so as to achieve at least a part of the problems and the effects described above. For example, the shape, material, arrangement, size, and the like of each component in the above embodiment can be appropriately changed according to the specific use mode of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Gasket, 11 ... Base part, 11a ... Resin contact part, 11b ... Groove bottom contact part, 11c ... Sealing side groove wall contact part, 12 ... Protrusion part, 12a ... Non-sealing side groove wall contact part, 30 ... Metal member, 30a, 40a: flat surface, 31: groove, 31a: non-sealed side groove wall, 31b: groove bottom, 31c: sealed side groove wall, 40: member made of resin, D: groove depth, g: gap, h: height, L: Protrusion length, R1: Upper groove space, R2: Lower groove space, S1, S2, S3: Seal line, T1: Thickness, X: Intrusion direction of salt water etc.

Claims

It is accommodated in a groove formed in a metal member, and is interposed between the metal member and a resin member to seal between the metal member and the resin member. A gasket,
The base,
A protrusion extending along the extension direction of the base and protruding from the non-sealing side of the base;
The gasket is characterized in that the protrusion is in contact with the groove.
The gasket according to claim 1, wherein the base is accommodated in the groove and compressed between the metal member and the resin member.
The base portion has a groove bottom contact portion contacting the groove bottom of the groove, and a resin contact portion contacting the resin member.
The gasket according to claim 1 or 2, wherein the projection is provided between the groove bottom contact portion and the resin contact portion.
The base is annularly formed,
The gasket according to any one of claims 1 to 3, wherein the projection extends around the entire circumference of the base.