JP2010133477A - Annular gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an annular gasket which regulates the flow-out of an elastic material, and is easy to be manufactured. <P>SOLUTION: In the annular gasket 1, a plurality of divided constituents 10a, 10b for a metal board are made to abut and joined to each other, and an elastic seal layer 2 is adhesively integrated to the internal peripheral side 3 of the annular-formed metal board 10. The metal board is characterized in that the plurality of divided constituents for the metal board are made to abut on each other with a slight clearance therebetween, and temporarily assembled into an annular shape to form an annular body, the seal layer is formed by adhesively integrating the elastic material to the internal peripheral side of the annular body, the elastic material is poured into an abutting part of the divided constituents for the metal board, and a throttle protrusion 11 for regulating the flow-out of the elastic material to the external side is formed in at least one part of the abutting part which is formed by vulcanizing the divided constituents for the metal board and joining them, and in which the divided constituents for the metal board are joined to each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is an annular gasket used for sealing a joint surface between two members, for example, between a joint surface between a heat exchanger cover and a heat exchanger of an internal combustion engine, and a joint between a cylinder block and an oil pan. The present invention relates to an annular gasket used for sealing between surfaces.

  An annular gasket formed in accordance with the shape of the joining surface is interposed on the joining surface as described above, and the two gaskets are fastened to clamp the annular gasket and seal it. As such an annular gasket, one in which an elastic seal layer made of rubber or the like is integrally attached to the inner peripheral side of an annular metal substrate is known, and the metal substrate has a predetermined annular shape. Manufactured by punching the shape.

  When punching the metal plate, the inner part of the annular body is scraped and discarded, but if the area of the opening to be sealed by the annular gasket increases, the proportion of the inner part of the annular body increases. This waste part increases and the production yield deteriorates. Patent Document 1 listed below discloses an annular gasket formed by punching a metal plate into a plurality of gasket constituent materials and joining these constituent materials in order to eliminate such productivity problems. ing.

In Patent Document 1 below, a plurality of gasket constituent members obtained by punching a steel plate are temporarily assembled into a desired shape (predetermined gasket shape), and the butted portions of the gasket constituent members are fixed and integrated by laser welding or the like. It is disclosed that a metal substrate is manufactured, and then a rubber material containing compressible fibers is applied to both surfaces of the metal substrate to form a covering material to obtain the above metal gasket. As described above, since the plurality of gasket constituent members constituting the annular metal substrate are formed by punching from the steel plate, the amount of scraping of the steel plate as the original plate is reduced, and the production yield is improved.
However, unevenness peculiar to welding occurs in the joint portion by laser welding or the like, and distortion or waviness due to heat during welding tends to occur in the surface area direction of the metal substrate, which impairs the sealing performance required as a gasket. There was a cause. Further, since the elastic seal layer is often integrally attached to the inner peripheral side of the metal gasket formed in this manner, an elastic seal layer is formed and an elastic material is formed at the joint portion of a plurality of gasket constituent members. Is formed by vulcanizing and joining a plurality of gasket constituent members.

In Patent Documents 2 and 3 below, end portions of a plurality of gasket constituent members are joined to form an annular body, a seal layer is provided on the inner peripheral side of the annular body, and joint portions of the plurality of gasket constituent members are provided. A seal body is disclosed.
JP 2003-336743 A JP-A-2005-214222 US Pat. No. 5,618,047

According to this, the production efficiency of the gasket can be further improved, and the tolerance of the gasket component member can be absorbed by the sealing body of the joint portion, but the joint portion (gasket configuration) formed on the plurality of gasket component members In order to form a seal body at a portion corresponding to a butt portion between members, it is necessary to pour an elastic material into the joint portion. Thus, there has been a problem that the elastic material having fluidity flows out to the outer peripheral side of the gasket constituent member through the joint portion of the gasket constituent member.
Therefore, in order to solve this problem, there is one in which a gasket constituent member is arranged and a mechanism for preventing the elastic material from flowing out is provided on the side of the molding die into which the elastic material is poured. However, in this case, when the gasket component member is disposed in the molding die, it is necessary to accurately dispose the gasket component member at the position where the mechanism is formed. Moreover, since it becomes necessary to produce a molding die according to the position where the joint portion of the gasket component is disposed and the place where the elastic material flows out, there is a concern that the cost may be increased.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an annular gasket that regulates the flow of an elastic material and is easy to manufacture.

  The annular gasket according to the invention of claim 1 is an annular gasket in which a plurality of divided components for a metal substrate are abutted and joined to each other, and an elastic seal layer is integrally attached to the inner peripheral side of the annular metal substrate. The metal substrate is formed by annularly joining a plurality of the divided components for the metal substrate with a slight gap to form an annular body, and an elastic material is integrally attached to the inner peripheral side of the annular body. And forming an elastic seal layer, pouring the elastic material into the butted portion of the metal substrate split component material, curing the elastic material and joining the metal substrate split component material, In at least one of the abutting portions to which the divided component for metal substrate is joined, a throttle projection for restricting the flow of the elastic material to the outer peripheral side is formed.

  In the present invention, as in a second aspect of the present invention, a plurality of the diaphragm protrusions may be provided so as to protrude in different directions. Further, as in a third aspect of the present invention, the plurality of aperture protrusions can protrude in directions orthogonal to each other. Further, according to a fourth aspect of the present invention, the gap between the abutting portions can be narrowed toward the outer peripheral side of the metal substrate.

Since the gasket which concerns on invention of Claim 1 can form a metal substrate by pouring an elastic material into the butt | matching part of the division | segmentation component material for several metal substrates, hardening | curing, and joining simultaneously with forming an elastic sealing layer. In addition, it is not necessary to separately perform laser welding or the like on the butt portion, and the production efficiency can be improved.
In addition, since at least one of the abutting portions to which the divided component for metal substrate is joined is formed with a throttle protrusion that restricts the flow of the elastic material to the outer peripheral side, the elastic material is on the inner peripheral side of the metal substrate. It is possible to suppress the flow from the outer periphery to the outer peripheral side, to satisfactorily join the butted portions, and to maintain the internal pressure necessary for vulcanization. Furthermore, because the squeezing protrusion is formed at the abutting part, even if a force that refracts the entire gasket is applied, the force applied to the abutting part is dispersed as compared to the shape of the abutting part, It can be made into the structure which is hard to be broken in the butt | matching part which tends to become weak. Since the restricting projection can suppress the elastic material from flowing out, there is no need to provide a mechanism for preventing the elastic material from flowing out on the molding die side as in the prior art, and there is no concern about cost increase.

According to the second aspect of the present invention, if a plurality of aperture projections are provided and protruded in different directions, the elastic material flowing into the butted portion from the inner peripheral side of the metal substrate flows out. Flows in a meandering manner by the restricting projections protruding in different directions. In other words, the elastic material does not flow out to the outer peripheral side of the metal substrate in a straight line, and the elastic material is distributed to the abutting portion while being effectively blocked by the restricting protrusions protruding in different directions. Can do. Therefore, it can suppress more effectively that an elastic material flows out from the inner peripheral side of a metal substrate to an outer peripheral side.
As in the invention of claim 3, even when the plurality of aperture projections protrude in directions orthogonal to each other, the elastic material moves from the inner periphery side to the outer periphery side of the metal substrate as in the invention of claim 2. It is possible to effectively regulate the flow. In addition, when the diaphragm protrusion is protruded in the orthogonal direction, the diaphragm protrusion also exhibits a positioning function when the metal substrate split component is abutted and placed in the molding die.
As in the invention of claim 4, since the gap of the butting portion is narrowed toward the outer peripheral side of the metal substrate, the flow of the elastic material flowing into the butting portion gradually declines toward the outer peripheral side, and the metal substrate It can be effectively controlled that the liquid flows out to the outer peripheral side.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1 is a schematic plan view showing an embodiment of the gasket of the present invention, FIG. 2 is an enlarged cross-sectional view taken along line XX in FIG. 1, and FIG. 3 is a flow chart of an example in the manufacturing method of the gasket. Is a partially enlarged plan view showing a modification of the gasket, FIGS. 5A, 5B, 6A, and 6B are partially enlarged plan views of another embodiment of the gasket of the present invention, FIG. FIG. 4 is a schematic plan view showing still another embodiment of the gasket of the present invention.

A gasket 1A shown in FIG. 1 is a metal substrate 10 formed into an annular shape by joining two divided members for a metal substrate (hereinafter, referred to as a first component 10a and a second component 10b). This is an annular gasket in which a seal layer 2 is integrally attached to the inner peripheral side, and is interposed between two members to seal between the two members.
The first component material 10a and the second component material 10b are abutted with a slight gap, and an elastic material that forms the seal layer 2 flows into the abutted portion and is vulcanized and joined to form a joint 21. is doing. Two constriction portions 11 for restricting the flow of the elastic material to the outer peripheral side 4 are formed at the abutting portion of the first component material 10a and the second component material 10b. In the figure, 3 indicates the inner peripheral side of the gasket 1A or the metal substrate 10, and 4 indicates the outer peripheral side thereof.

As shown in the enlarged view of part A of FIG. 1, the end portions of the first component member 10a and the second component member 10b are notched stepped portions 10aa and 10ba so that they are abutted with a slight gap between them, Extension portions 10ab and 10bb are formed. The notch step portion 10aa of the first component material 10a is abutted so as to face the extension portion 10bb of the second component material 10b, and the extension portion 10ab of the first component material 10a is the second component material. Butting is performed so as to face the notch step portion 10ba of 10b.
On the outer portion 10ac of the extending portion 10ab in the first component 10a, a throttle projection portion 11 that protrudes toward the outer peripheral side 4 of the gasket 1A is formed. In addition, an extension projection 10bb of the second component 10b is formed with a throttle projection 11 protruding toward the notch step portion 10aa of the first component 10a, and these throttle projections 11 are orthogonal to each other. Protruding.
The overall shapes of the first component material 10a and the second component material 10b shown here are not limited to those shown in FIG. In addition, if the 1st component material 10a and the 2nd component material 10b shall be stamped and formed from a steel plate so that it may mention later, production efficiency can be improved.

FIG. 2 is an enlarged sectional view taken along line XX in FIG. The seal layer 2 includes a bead portion 20 that compressively elastically deforms when interposed between two members, and the bead portion 20 is formed on both sides in the thickness direction of the seal layer 2.
Concave portions 10c are formed on both the front and back surfaces of the metal substrate 10 on the inner peripheral surface 3 of the metal substrate 10, and the adhesive property of the seal layer 2 is enhanced by forming the seal layer 2 also on the concave portion 10c. . Alternatively, the adhesiveness to the seal layer 2 can be further improved by applying an adhesive to the inner peripheral side end face of the metal substrate 10 and performing vulcanization molding.

  The metal substrate 10 is made of a cold rolled steel plate or a stainless steel plate. When a rubber material is used as an elastic material constituting the elastic seal layer 2, NBR, styrene butadiene rubber (SBR), isoprene rubber (IR), chloroprene. Rubber (CR), butadiene rubber (BR), butyl rubber (IIR), ethylene-propylene rubber (EPM), fluoro rubber (FKM), silicone rubber (VMQ), chlorosulfonated polyethylene CSM), ethylene vinyl acetate rubber (EVA), Examples include polyethylene chloride (CPE), butyl chloride rubber (CIR), epichlorohydrin rubber (ECO), nitrile isoprene rubber (NIR), and natural rubber (NR). Moreover, as said elastic material, it can also be set as the elastic compound material or synthetic resin material which mixed compressive fibers, such as glass fiber and ceramic fiber.

Next, the manufacturing procedure of the gasket 1A will be described with reference to FIG. Here, a case where a rubber material is used as the elastic material will be described.
First, a large number of components having a predetermined shape are produced by punching a steel plate (metal plate) as an original plate (step S1). At this time, if the components 10a and 10b having the same shape are punched from a steel plate as an original plate in a state of being adjacent to each other, the number of portions to be punched is less than that in the case of directly punching the annular body, and the yield is improved. be able to.
Then, the two constituent members 10a and 10b are placed in a molding die (not shown) (step S2). At this time, either one of the first constituent members 10a and the other one of the second constituent members 10b are temporarily assembled with a slight gap to form an annular body (step S3).
Since each of the constituent members 10a and 10b protrudes in the direction in which the throttle protrusions 11 are orthogonal, when they are arranged in the molding die, the throttle protrusions 11 may be arranged so as to be orthogonal. That is, the aperture projection 11 fulfills a positioning function when it is placed in the molding die.

Next, unvulcanized rubber is injected into the cavity in which the seal layer 2 is vulcanized (step S4). Then, the rubber material flows into a slight gap at the butt portion. At this time, the restricting projection 11 exerts a damming effect so that the rubber material does not pass through the butted portion and flow out from the inner peripheral side 3 to the outer peripheral side 4 of the metal substrate 10, thereby restricting the flow of the rubber material. To do.
When the rubber material has spread to the part where the seal layer 2 is formed and the butt portion, heating and pressurizing are performed for a predetermined time, and the seal layer 2 is integrally vulcanized and molded to the metal substrate 10, and the butt portion is vulcanized and joined ( Steps S5 and S6) and demolding (Step S7) to obtain the gasket 1A.

  According to the above, the seal layer 2 is formed on the inner peripheral side 3 of the metal substrate 10, and at the same time, the rubber material is poured into the abutting portion of the first component material 10a and the second component material 10b, and vulcanized and joined. Since 21 can be formed, production efficiency can be improved. Further, as described above, the restricting projection 11 for restricting the flow of the rubber material to the outer peripheral side 4 is formed, so that the rubber material passes through the abutting portion and from the inner peripheral side 3 to the outer peripheral side 4 of the metal substrate 10. Thus, the butt joint can be satisfactorily vulcanized and joined, and the internal pressure required for vulcanization can be maintained. Since the diaphragm protrusion 11 is formed at the abutting portion, the force applied to the abutting portion is dispersed as compared to the straight shape of the abutting portion even when a force that refracts the entire gasket 1A is applied. In addition, the butt portion (joint portion 21) that tends to be fragile can be structured to be difficult to break. Furthermore, since the restricting projection 11 can suppress the flow of the elastic material, it is not necessary to provide a mechanism for preventing the flow of the elastic material on the molding die side as in the prior art, and there is no fear of increasing the cost.

FIG. 4 is a partially enlarged plan view showing a modification of the gasket.
The gasket 1B shown here is the same as the gasket 1A in that each of the first component material 10a and the second component material 10b is provided with a throttle protrusion 11, but in addition, the outer periphery of the metal substrate 10 is provided. This is a different example in that the inclined portion 12 is provided at the end portion of the outer peripheral side 4 of the second component 10b so that the joint portion 21 gradually narrows toward the side 4.
If the inclined portion 12 is provided as described above, the flow of the elastic material flowing into the abutting portion (joint portion 21) between the first component material 10a and the second component material 10b is directed toward the outer peripheral side 4. Therefore, it can be effectively controlled so that it does not gradually fade and flow out to the outer peripheral side 4 of the metal substrate 10.
Since other configurations and effects are the same as those of the gasket 1A, the description thereof is omitted.

In the above description, the example in which the aperture projection 11 is provided on each of the first component 10a and the second component 10b has been described. However, the position where the aperture projection 11 is provided is limited to the above-described embodiment. is not. FIGS. 5A and 5B show an example different from the above-described embodiment in that the aperture protrusion 11 is formed at two positions on each end of the second component 10b.
FIG. 5 (a) shows an example in which a throttle protrusion 11 protruding toward the inner peripheral side 3 of the gasket 1C is formed on the inner portion 10bc of the extending portion 10bb in the second component 10b. Yes. Further, the extension portion 10bb is further formed with a throttle projection portion 11 protruding toward the notch step portion 10aa side of the first component 10a, and these throttle projection portions 11 protrude in directions orthogonal to each other. Yes.
Even when the aperture projection 11 is formed in this way, the elastic material that has entered the joining portion 21 does not pass through the butted portion and flows out to the outer peripheral side 4 of the metal substrate 10, and effectively flows out. Can be regulated.
Since other configurations and effects are the same as those of the gasket 1A, the description thereof is omitted.

FIG. 5B has the same point that the aperture projections 11 are formed at two locations only on the second component 10b side as in FIG. 5A, and the formed positions are orthogonal to each other. A different gasket 1D is shown in that it is not a position.
At the corner on the inner side 10bc side of the extending portion 10bb in the second component 10b, the inner portion 10ac of the extending portion 10ab in the first component 10a and the corner 10ad of the notch step portion 10aa protrude. An aperture projection 11 is formed.
Therefore, the aperture projection 11 protrudes slightly upward.
In addition, a narrow projection 11 that protrudes toward the notch step 10aa of the first component 10a is also formed at the corner on the outer side 10bd side of the extension 10bb in the second component 10b.
The diaphragm protrusions 11 do not necessarily have to be provided orthogonally as in the gaskets 1A to 1C. Even when formed in this way, the elastic material that has entered the joint 21 passes through the butted portion and is on the outer peripheral side of the metal substrate 10. The flow out can be effectively regulated without flowing out to 4. In particular, if the squeezing projection 11 is provided at the corner on the outer side 10bd side of the extension 10bb, the unvulcanized elastic material can be reliably regulated before flowing out to the outer peripheral side 4 of the metal substrate 10.
Since other configurations and effects are the same as those of the gasket 1A, the description thereof is omitted.

In the above description, various embodiments of the position where the diaphragm protrusion 11 is provided have been described. However, the shape of the abutting portion (joint portion 21) between the first component 10a and the second component 10b is the same as that of the above-described embodiment. It is not limited. 6 (a) and 6 (b) show examples in which the shape of the butted portion is different from that of the above-described embodiment, and are partially enlarged plan views of gaskets 1E and 1F shown by partially breaking.
In FIG. 6A, a projecting extension 10ab is formed at the center of the end of the first component 10a, and the end of the second component 10b is the extension of the first component 10a. The gasket 1E in which the concave notch recessed part 10be is formed so that it may butt | match with the part 10ab is shown.
The end portion of the first component 10a is formed with the extending portion 10ab in the protruding extending portion as described above, and the notched step portions 10aa are formed on both sides thereof.
Of the notch step portions 10aa provided on both sides, the notch step portion 10aa on the outer peripheral side 4 of the metal substrate 10 has a narrowing projection portion 11 protruding toward the extending portion 10bb on the outer peripheral side 4 of the second component 10b. Is formed.

On the other hand, the end portion of the second component 10b is formed with the concave notch recess 10be as described above, and on both sides thereof, the extension extending to the side where the first component 10a is disposed. Part 10bb is formed.
Out of the extending portions 10bb provided on both sides, a narrowing projection 11 that protrudes toward the inner peripheral side 3 of the metal substrate 10 is formed on the inner portion 10bc of the extending portion 10bb on the outer peripheral side 4 of the metal substrate 10. Yes. The two aperture projections 11 formed on each of the first component material 10a and the second component material 10b protrude in directions orthogonal to each other.
When the shape of the butted portion (joining portion 21) is formed in this way, the elastic material flows so as to meander between the extending portion 10ab and the notch recessed portion 10be, so that it flows out to the outer peripheral side 4 of the metal substrate 10 at once. There is no end. Of course, the flow-out can also be effectively controlled by the throttle protrusion 11.
Since other configurations and effects are the same as those of the gasket 1A, the description thereof is omitted. Further, it is the same as the gasket 1D in that the aperture protrusion 11 does not necessarily have to protrude in the orthogonal direction.

FIG. 6B shows an example in which the shape of the butted portion is different from that of the gaskets 1A to 1D as in FIG. 6A, and FIG. 6A is only on the second component 10b side. The gasket 1F which differs in the point in which the aperture | diaphragm | squeeze projection part 11 was formed is shown.
A convex extension 10ab is formed at the center of the end of the first component 10a, and the end of the second component 10b is abutted against the extension 10ab of the first component 10a. The point that the concave cutout 10be is formed is the same as in FIG.
Out of the extended portions 10bb provided on both sides of the second component 10b, the aperture that protrudes toward the inner peripheral side 3 of the metal substrate 10 on the inner portion 10bc of the extended portion 10bb on the outer peripheral side 4 of the metal substrate 10 A protrusion 11 is formed. Further, the same extending portion 10bb is formed with a narrowing projection portion 11 protruding toward the notch step portion 10aa side of the first component 10a.
Thus, even when the aperture projections 11 are provided at two locations on the second component 10b side, the same effects as in FIG. 6A can be obtained.
Since other configurations and effects are the same as those of the gasket 1A, the description thereof is omitted. Further, it is the same as the gasket 1D in that the aperture protrusion 11 does not necessarily have to protrude in the orthogonal direction.

In the gasket 1G shown in FIG. 7 to be described next, the first constituent material 10a is L-shaped and the end thereof is straight, and the second constituent material 10b that forms an annular body by abutting against the end portion. In this example, the diaphragm protrusions 11 are formed one by one at both ends.
Points common to the gasket 1A are denoted by the same reference numerals, and the description thereof is omitted.
According to this, since the shape of the first component 10a is simple, it is easy to produce a large number of predetermined L-shaped components by punching a steel plate (metal plate) as an original plate, and in close proximity. Since the shape can be easily punched in this state, the yield can be improved.
Also in this embodiment, the aperture projection 11 is formed at the end of the second component 10b, and the aperture 11 protrudes toward the side where the end of the first component 10a is disposed. Therefore, the elastic material can be effectively regulated so as not to flow from the inner peripheral side 3 to the outer peripheral side 4 of the metal substrate 10.
In this embodiment, an example in which the aperture protrusions 11 are provided in directions orthogonal to each other is shown. However, the aperture protrusions 11 do not necessarily have to protrude in the orthogonal direction, and each protrudes in the same direction. (Not shown).

  Note that the overall shape of the gasket 1 (for example, gaskets 1A and 1G) is not limited to that shown in the drawings, and other shapes can be employed. It is not limited by the thing of an example. In addition, the example in which the diaphragm protrusion 11 is provided at one or two places at the respective end portions of the constituent members 10a and 10b has been described, but is not limited thereto, and restricts the flow of the elastic material more than necessary. If not, three or more aperture protrusions 11 may be provided.

It is a schematic plan view which shows one Embodiment of the gasket of this invention. FIG. 2 is an enlarged sectional view taken along line XX in FIG. 1. It is a flowchart of an example of the manufacturing method of the gasket. It is a partially expanded plan view which shows the modification of the gasket. (A) (b) is a partially expanded plan view of another embodiment in the gasket of this invention. (A) (b) is a partially expanded plan view of another embodiment in the gasket of this invention. It is a schematic plan view which shows another embodiment of the gasket of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 (1A-1G) Gasket 2 Elastic seal layer 3 Inner peripheral side 4 Outer peripheral side 10 Metal substrate 10a 1st component (division component for metal substrates)
10b Second component (divided component for metal substrate)
11 Aperture projection

Claims (4)

An annular gasket in which a plurality of divided components for a metal substrate are joined to each other and joined, and an elastic seal layer is integrally attached to the inner peripheral side of the annular metal substrate,
The metal substrate is formed by abutting a plurality of divided components for a metal substrate with a slight gap and temporarily assembling into an annular shape to form an annular body, and an elastic material is integrally attached to the inner peripheral side of the annular body to be elastic. Forming a sealing layer, pouring the elastic material into the butted portion of the metal substrate split component, curing the elastic material and joining the metal substrate split component,
An annular gasket, characterized in that a throttle protrusion for restricting the elastic material from flowing to the outer peripheral side is formed in at least one of the butted portions to which the metal substrate split component is joined. The annular gasket according to claim 1,
An annular gasket characterized in that a plurality of the throttle protrusions are provided so as to protrude in different directions. The annular gasket according to claim 2,
The annular gasket, wherein the plurality of throttle protrusions protrude in directions orthogonal to each other. In the annular gasket according to any one of claims 1 to 3,
The annular gasket, wherein a gap between the butted portions is narrowed toward the outer peripheral side of the metal substrate.

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