JP2008064204A - gasket - Google Patents

Abstract

An object of the present invention is to provide a gasket having good assembling property, sealing property, and mounting property.
A gasket 3 is interposed between two members of a fitting tube portion 2a and a fitting receiving portion (mounting recess 5) fitted thereto, and seals between the two members, and includes a through hole 3a. The core material 31 includes a seal portion 32 that is integrally formed by vulcanization adhesion of a rubber material along the inner peripheral edge of the through hole of the core material, and the core material has the through hole formed therein. It is characterized by comprising a flat annular portion 31a and a restraining portion 31b which is coupled to the flat annular portion and is formed so as to be restrained by the fitting tube portion.
[Selection] Figure 1

Description

  The present invention relates to a gasket that is interposed between two members of a fitting tube portion and a fitting receiving portion fitted thereto, and seals between the two members.

2. Description of the Related Art Various types of gaskets that seal between two members of a cylindrical part have been known as a gasket for sealing between two members as described above. Among them, for example, an injector that serves as a fuel injection valve for an engine such as an automobile And a part fitted to a fitting part of the engine manifold, a stick coil mounting part, or a plug mounting part such as an ignition are required to have a sealing property capable of withstanding vibration, external force and the like.
Therefore, the one described in Patent Document 1 below forms a recess over the entire circumference of the inner peripheral surface of the gasket, and protrudes radially inward over the entire circumference at the opening edge of the recess. The protrusion is integrally formed.
Japanese Utility Model Publication No. 5-42671

According to this, even if vibration is generated, the protrusion can be expanded and contracted in the axial direction through the recess, so that the vibration can be absorbed, and even if the injector is inclined by an external force or the like, the recess By extending and contracting in the axial direction via the portion, the inclination of the injector can be absorbed and sealing performance can be secured.
However, when the protrusions that absorb vibration are integrally formed as a gasket as in the above-mentioned Patent Document 1, if there is a deviation in the elastic deformation of the protrusions, there is a problem that the sealing performance of the gasket is directly affected. In other words, when trying to maintain the sealing performance by elastic deformation of the protrusions integrally formed with rubber material etc. and its restoring elasticity, the gasket is directly affected by precision deviations such as design tolerances and deviations due to movement such as vibration, The protrusions are not elastically deformed in the axial direction via the recess, and the sealing performance between the two members is impaired. Therefore, in order to solve this problem, it has been necessary to secure a certain seal width at the portion where the gasket is attached.

  Moreover, in the thing like the said patent document 1, if there exists a dimensional tolerance between the member which interposes a gasket, and a gasket, the problem of the assembly | attachment property that a gasket will drop | omit, or after fitting a gasket, it fits two members. There was also a problem in the mounting property, such as when the gaskets were elastically deformed in an unintended direction.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a gasket having good assembling property, sealing property, and mounting property.

  A gasket according to the present invention is interposed between two members of a fitting cylinder part and a fitting receiving part fitted thereto, and seals between the two members, and includes a core member provided with a through hole. And a seal part integrally formed by vulcanization adhesion of a rubber material along the inner peripheral edge of the through hole of the core material, and the core material includes a flat annular part in which the through hole is formed, It is connected to this flat annular part, and consists of a restraining part formed so as to restrain the fitting tube part.

Moreover, in the gasket which concerns on this invention, a restraint part shall consist of a nail | claw member and the bent part made convex on the fitting cylinder part side shall be formed in this nail | claw member. You can also. The claw member may be formed in a cylindrical portion concentrically coupled with the through hole on the outer peripheral edge portion of the core member. The claw member may be further coupled with a bent portion that is convex on the opposite side of the fitting tube portion.
Further, the restraining portion is formed in a cylindrical portion that is concentrically connected to the through hole on the outer peripheral edge portion of the core member, and is a convex bent portion or a cut and raised portion that protrudes toward the fitting tube portion side. It can consist of a nail | claw part.

According to the gaskets of the first to sixth aspects of the invention, the core material is composed of a flat annular portion in which a through hole is formed and a restraint portion coupled to the flat annular portion. It can be easily assembled to the fitting cylinder, and after it has been assembled, it can be made difficult to drop off from one of the parts on which the gasket has been assembled before being interposed between the two parts. It is possible to improve the packaging and transportability. Further, the sealing portion is integrally formed by vulcanization adhesion of the rubber material along the inner peripheral edge portion of the through hole of the core material, and the core material has a restraining portion formed so as to be restrained by the fitting cylinder portion. Therefore, even if there is a precision deviation such as a design tolerance or a deviation due to vibration, or a case where the fitting tube part is inclined, the core restraint part will be displaced or inclined. Since it absorbs, there is no deviation in the seal part and the sealed state can be maintained, so that the sealing performance of the gasket is not affected. Furthermore, by being restrained by the restraining portion as described above, the two members can be fitted in the state where they are assembled to the fitting cylinder portion, so that the wearability is good.
Therefore, it can be set as a gasket with a favorable assembly | attachment property, sealing performance, and mounting | wearing property.

  According to the gasket of the second aspect of the present invention, the restraining part is made of a claw member, and the fitting cylinder part can be restrained by the claw member, so that the assembling property to the fitting cylinder part is good, It is possible to prevent the gasket from falling off after assembly. Further, when the two members are fitted, there is no deviation in the seal portion, and a gasket with good sealing properties and mounting properties can be obtained.

  According to the gasket of the third aspect of the invention, the claw member is formed with the bent portion that is convex on the fitting tube portion side, so that the fitting tube portion can be more firmly restrained. Therefore, the assembling property to the fitting cylinder portion is good, and the gasket can be prevented from falling off after assembling. Further, when the two members are fitted, there is no deviation in the seal portion, and a gasket with good sealing properties and mounting properties can be obtained.

  According to the gasket of the fourth aspect of the present invention, the claw member is formed in the cylindrical portion concentrically coupled with the through hole on the outer peripheral edge portion of the core material, so that the positioning accuracy during assembly is improved. In addition, since the displacement of the claw member can be made difficult to occur, the clamping force to the fitting member is increased, and the sealing property and the mounting property between the two members can be further improved as well as the assembling property.

  According to the gasket of the fifth aspect of the present invention, since the claw member is further coupled with the bent portion that is convex on the side opposite to the fitting tube portion, the bent portion fits two members. When they are combined, they come into contact with the side surface of one of the members to be fitted, so that the gasket is less likely to be displaced due to a synergistic effect with the restraining force of the bent portion that is convex on the fitting tube portion side. Since the portion can maintain a sealed state, it can have a good sealing property.

  According to the gasket of the invention of claim 6, the restraining portion is formed in the cylindrical portion concentrically coupled with the through hole on the outer peripheral edge portion of the core material, and is convex on the fitting tube portion side. Therefore, the fitting tube portion can be restrained, so that it can be easily assembled to the fitting tube portion and can be prevented from falling off after assembling. Further, when the two members are fitted, there is no deviation in the seal portion, and a gasket with good sealing properties and mounting properties can be obtained.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view (first embodiment) showing a state in which the gasket of the present invention is interposed between an injector and a body (manifold of an engine), and FIG. 2 (a) is a view of the gasket in FIG. 1 is an overall perspective view, FIG. 3B is a partial cross-sectional view of the gasket in FIG. 1, FIG. 3A is a partial cross-sectional view showing an example of a molding die for the gasket of the first embodiment, and FIG. (A) The fragmentary sectional view of the gasket manufactured by the molding die in FIG. 4, FIG. 4 shows the modification of the gasket of 1st Embodiment, The schematic diagram which shows the state interposed between the injector and the body, 5A is an overall perspective view of a gasket according to another embodiment (second embodiment), FIG. 5B is a partial cross-sectional view of the gasket, and FIG. 6A is a gasket according to still another embodiment. FIG. 6B is a perspective view of the whole (third embodiment). Partial cross-sectional view of the gasket, Fig. 7 (a) (b) is an overall perspective view of a gasket which is a modification of the third embodiment, FIG. 7 (b) is a partial sectional view of the gasket.

The gasket of the present invention is interposed between two members of a fitting cylinder part and a fitting receiving part (in the following embodiment, an attachment concave part 5) fitted thereto, and seals between the two members. The present invention can be applied to a portion that seals between two members of a cylindrical part. For example, it can be inserted in a site to be sealed, such as an injector, a stick coil, or a glow plug.
In each embodiment described below, a case where the gasket of the present invention is interposed in a seal portion of an injector constituting a part of a fuel injection device such as an automobile will be described as an example.

The first embodiment will be described below.
FIG. 1 is a schematic view showing a state in which a gasket of the present invention is interposed between an injector and a body as a first embodiment, FIG. 2A is an overall perspective view of the gasket in FIG. b) is a partial cross-sectional view of the gasket in FIG. 1.
A fuel injection system that supplies the appropriate mixture required by an automobile engine instead of a carburetor electrically detects the amount of intake air and sends information such as the engine speed and the temperature of each part to a computer (control unit). The most suitable fuel injection amount is calculated and the fuel is accurately injected from the injector 1. Specifically, an appropriate amount of fuel is pumped to the injector 1 by a fuel pump (not shown), The fuel is injected into the intake manifold by a signal from the computer.
In the figure, reference numeral 1 denotes an injector that is attached to an intake manifold (not shown) of each cylinder and injects an appropriate amount of fuel, 2 is a substantially cylindrical housing of the injector 1, and 3 is a fitting between the injector 1 and the body 4. Gasket 4 is connected to a cylinder head (not shown), 5 is a body provided in the body 4, a mounting recess in which an injector 1 attached to the gasket 3 is mounted, and 6 is injected by the injector 1. The fuel injection port.

The gasket 3 includes a core member 31 having a through hole 3a, and a seal portion 32 integrally formed by vulcanization adhesion of a rubber material along the inner peripheral edge portion of the core member 31. The material 31 includes a flat annular portion 31a in which the through hole 3a is formed, and a restraining portion 31b that is coupled to the flat annular portion 31a and is restrained by the fitting tube portion 2a of the housing 2. It consists of.
As shown in FIG. 1, in the gasket 3, a seal portion 32 is fitted to a gasket mounting portion 2 b formed on the housing 2 of the injector 1, and a restraining portion 31 b of the core material 31 is fitted to the fitting cylinder portion 2 a of the housing 2. It is assembled to be detained.

The retaining portion 31b of the core member 31 is formed of a claw member, and the configuration of the claw member 31b is not limited to the shape shown in FIGS. 1 and 2, but the claw member 31b is a fitting cylinder portion as shown in the figure. If the bent portion 31ba that is convex on the 2a side is formed, the fitting tube portion 2a can be firmly restrained, so that the assemblability is good, and after the gasket 3 is assembled, The gasket 3 can be made difficult to fall off. Therefore, according to this, the gasket 3 can be assembled | attached to the injector 1 stably, and it can be set as the thing with good packing property, transportability, etc. in this state. Further, when the injector 1 is fitted into the mounting recess 5, the seal portion 32 is not displaced from the gasket mounting portion 2b in the assembled state, so that the sealing property and the mounting property can be improved.
Here, the illustrated example shows an example in which three retaining portions 31b (claw members) are coupled to the flat annular portion 31a, but the present invention is not limited to this, and the retaining tube portion 2a to be restrained. It is designed appropriately according to the size of the.

Seal part 32 of gasket 3 is made of silicone rubber, perfluoroelastomer, butyl rubber, styrene-butadiene copolymer, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, It is made of a rubber material such as butadiene rubber, polyisobutylene, fluorine rubber, or ethylene-propylene rubber. The shape of the seal portion 32 of the gasket 3 is not particularly limited. For example, the seal portion 32 has a bead portion 32a formed thicker than the thickness of the flat annular portion 31a along the inner peripheral edge of the through hole of the flat annular portion 31a. If it is set as the shape which carried out, when it is made to interpose between the injector 1 fitted and the attachment recessed part 5, the said bead part 32a will compress-deform, and a sealing performance will be maintained with the restoring elasticity. As shown in FIGS. 1 and 2, the seal portion 32 is provided with a holding portion 32b formed to extend outward from the bead portion 32a on the lower surface of the inner peripheral edge of the through hole of the flat ring portion 31a. Then, the gasket 3 in which the core material 31 and the seal portion 32 are firmly and integrally formed can be obtained. The configuration of the seal portion 32 will be described in detail later.
As the core material 2, a material obtained by molding a steel plate, resin, or the like is appropriately used.

FIG. 3A is a partial cross-sectional view showing an example of the molding die of the gasket of the present invention, and FIG. 3B is a partial cross-sectional view of the gasket manufactured by the molding die in FIG. In addition, the structure of a metal mold | die is not restricted to this.
In the gasket 3 shown here, the shape of the restraining portion 31b is the same as that in FIGS. 1 and 2, but the shape of the seal portion 32 is different.
The upper and lower molds 7 and 8 are formed with cavities corresponding to the shape of the seal portion 32. After the core material 31 molded into a predetermined shape is placed in the lower mold 8 and the upper mold 7 is installed, Vulcanized rubber is loaded into the cavity, pressurized and heated to cure the unvulcanized rubber. As a result, the rubber seal part 32 is vulcanized and bonded to the core member 31, and the gasket 3 can be molded integrally.

As shown in FIG. 3B, if the clearance C is designed so that a clearance C is formed between the inner peripheral surface of the bent portion 31ba and the outer peripheral edge 32ba of the upper surface of the seal portion 32, the clearance C The mold pressing part is secured, the mold can be removed, the molding with a simple structure mold is facilitated, and the seal part 32 can be integrally molded after the retaining part 31b of the core material 31 is formed and processed. It becomes possible. If there is no clearance C, it is necessary to form the bent portion 31ba after molding the seal portion 32.
Further, the seal portion 32 shown here is thicker than the thickness of the flat annular portion 31a along the inner peripheral edge portion of the flat annular portion 31a, protrudes inward, and has a bead portion 32a formed in a vertically symmetrical manner. The annular portion 31a includes a holding portion 32b formed on the upper and lower surfaces of the inner peripheral edge portion of the through hole so as to extend outward from the bead portion 32a.
If the seal portion 32 has such a shape having the bead portion 32a, the bead portion 32a is compressed and deformed when it is interposed between the fitted injector 1 and the mounting recess 5, and its restoring elasticity is obtained. Thus, the sealing performance is maintained. Further, if the holding portion 32b is provided on the upper and lower surfaces of the inner peripheral edge portion of the through hole of the flat annular portion 31a, the gasket 3 in which the core member 31 and the seal portion 32 are more firmly fixed and integrated. be able to.

FIG. 4 is a schematic view showing a modification of the gasket of the first embodiment and showing a state where the gasket is interposed between the injector and the body.
The restraining portion 31b of the gasket 3 shown in FIG. 4 is formed of a claw member, and a bent portion 31ba that is convex on the fitting tube portion 2a side is formed, and a convex shape is formed on the opposite side to the fitting tube portion 2a. The bent portion 31bb is further coupled. That is, the gasket is provided with the bent portions 31ba and 31bb bent in a convex shape in a direction opposite to each other on one claw member 31b, and the bent portion 31bb which is convex on the opposite side to the fitting tube portion 2a. When the injector 1 is fitted into the mounting recess 5, the injector 1 is in elastic contact with the side surface of the mounting recess 5.
The seal portion 32 shown here is one in which the holding portion 32b is formed only on the lower surface side of the inner peripheral edge portion of the through hole of the flat annular portion 31a, but is not limited to this. Needless to say, the shape shown in 3 is also applicable.

  According to this, in addition to the effect of the bent portion 31ba that is convex toward the fitting cylinder portion 2a described above, when the injector 1 in which the gasket 3 is interposed is fitted into the mounting recess 5, the side of the mounting recess 5 is Since the bent portion 31bb comes into contact, the claw member is interposed between the peripheral surface of the fitting cylinder portion 2b of the injector 1 and the inner wall surface of the mounting recess 5 after the injector 1 is fitted into the mounting recess 5. 31b is in a state of being elastically mounted, and the two bent portions 31ba and 31bb are unlikely to be displaced in the gasket 3, and the seal portion 32 can maintain a sealed state, so that the sealing property can be improved.

The second embodiment will be described below.
Fig.5 (a) is a whole perspective view of the gasket of this embodiment, (b) is a fragmentary sectional view of the gasket. In addition, the same code | symbol is attached | subjected to the part which is common in 1st Embodiment, and the description is omitted.
In the core material 31 of the gasket 3 shown in FIG. 5, a cylindrical portion 31 c concentrically coupled to the through hole 3 a is formed on the outer peripheral edge portion of the core material 31, and the restraining portion 31 b is the cylindrical portion 31 c. Is formed. The restraining portion 31b is formed of a claw member, and the claw member 31b is formed with a bent portion 31ba that is convex toward the fitting tube portion 2a. The seal portion 32 has a holding portion 32b that is transparent to the flat annular portion 31a. Although what was formed only in the lower surface side of the inner peripheral part of a hole is shown, it is not limited to this and it cannot be overemphasized that the thing of the shape shown in FIG. 3 is applicable.
Further, the illustrated example shows an example in which three restraining portions 31b (claw members) are formed on the cylindrical portion 31c, but the present invention is not limited to this, and the size of the fitting cylindrical portion 2a to be restrained, etc. It is designed appropriately according to

  According to this, since the positioning accuracy at the time of assembly can be improved and the displacement of the restraining portion 31b (claw member) can be made difficult, the restraining force on the housing 2 is also increased, and the assembly performance is improved. Of course, the sealing performance and the mounting performance can be further improved. That is, since the bent portion 31ba is formed in the cylindrical portion 31c, positioning at the time of assembly is easy, and the gasket 3 can be firmly restrained by the bent portion 31c to the fitting cylinder portion 2a. Assemblability is good, and it is possible to prevent dropping after the gasket 3 is assembled. Further, when the injector 1 is fitted into the mounting recess 5, the seal portion 32 is not displaced in the assembled state, so that the sealing property and the mounting property can be improved.

The third embodiment will be described below.
FIG. 6A is an overall perspective view of the gasket of this embodiment, and FIG. 6B is a partial cross-sectional view of the gasket. In addition, the same code | symbol is attached | subjected to the part which is common in 1st Embodiment, and the description is omitted.
The retaining portion 31b of the gasket 3 shown in FIG. 6 is formed on the inner peripheral surface of the cylindrical portion 31c concentrically connected to the through hole 3a on the outer peripheral edge portion of the core member 31, and protrudes toward the fitting cylindrical portion 2a. The seal portion 32 is formed in the shape of a convex curved portion 31bc and the holding portion 32b is formed only on the lower surface side of the inner peripheral edge portion of the through hole of the flat annular portion 31a, but is not limited thereto. Needless to say, the shape shown in FIG. 3 is also applicable.
The example shown in the figure shows an example in which three convex curved portions 31bc are formed on the cylindrical portion 31c. However, the present invention is not limited to this, and is appropriately designed according to the size of the fitting cylindrical portion 2a to be restrained. Is done.

  According to this, since the gasket 3 can be restrained to the fitting cylinder part 2a by the convex curved part 31bc, the assembling property to the fitting cylinder part 2a is good, and the gasket 3 after assembly is prevented from falling off. can do. Further, when the injector 1 is fitted into the mounting recess 5, the seal portion 32 is not displaced, and the gasket 3 having good sealing properties and mounting properties can be obtained.

Fig.7 (a) is a whole perspective view of the gasket which is a modification of this embodiment, (b) is a fragmentary sectional view of the gasket. The structure of the restraining part 31b differs from the gasket 3 shown to Fig.6 (a) (b). In addition, the same code | symbol is attached | subjected to the part which is common in 1st Embodiment, and the description is omitted.
The restraint part 31b of the gasket 3 shown to Fig.7 (a) (b) is formed in the cylindrical part 31c concentrically connected with the through-hole 3a in the outer peripheral edge part of the core material 31, and the fitting cylinder part 2a. It consists of a raised and raised claw portion 31bd that is cut and raised so as to be convex to the side, and the seal portion 32 shows that the holding portion 32b is formed only on the lower surface side of the inner peripheral edge of the through hole of the flat annular portion 31a. However, it is not limited to this, and it is needless to say that the shape shown in FIG. 3 can also be applied.

The cut-and-raised claw portion 31bd cuts out a part of the cylindrical portion 31c, cuts and raises the cut-out portion so as to be convex toward the fitting tube portion 2a, and cuts and raises the claw-shaped portion. And configured so that it can be held by the fitting tube portion 2a. The example shown in the figure shows an example in which three cut and raised claw portions 31bd are formed on the cylindrical portion 31c, but the present invention is not limited to this, and is appropriately selected according to the size of the fitting tube portion 2a to be restrained. Designed.
Further, the cut-and-raised claw portion 31bd is not limited to the shape shown in the figure. For example, the cut-and-raised claw portion is bent in a convex shape toward the fitting tube portion 2a to form a bent portion (not shown). It is good also as what restrains to the fitting cylinder part 2a by a part.

  According to this, since the gasket 3 can be cut and raised in the fitting cylinder part 2a and can be restrained by the claw part 31bd, the assembling property to the fitting cylinder part 2a is good, and the gasket 3 is detached after the assembling. Can be prevented. Further, when the injector 1 is fitted into the mounting recess 5, the seal portion 32 is not displaced, and the gasket 3 having good sealing properties and mounting properties can be obtained.

  It should be noted that the shapes of the injector 1, the core 31 of the gasket 3, the seal portion 32, and the like are not limited to those illustrated in the drawings, and it is needless to say that the shapes are appropriately selected depending on the places where they are interposed.

It is the schematic (1st Embodiment) which shows the state which interposed the gasket of this invention between the injector and the body. (A) is the whole perspective view of the gasket in FIG. 1, (b) is a fragmentary sectional view of the gasket in FIG. (A) is a fragmentary sectional view which shows an example of the molding die of the gasket of 1st Embodiment, (b) is a fragmentary sectional view of the gasket manufactured by the molding die in Fig.3 (a). It is the schematic which shows the modification of the gasket of 1st Embodiment, and shows the state inserted between the injector and the body. (A) is the whole perspective view (2nd Embodiment) of the gasket of another embodiment, (b) is a fragmentary sectional view of the gasket. (A) is the whole perspective view (3rd Embodiment) of the gasket of another embodiment, (b) is a fragmentary sectional view of the gasket. (A) is the whole perspective view of the gasket which is a modification of 3rd Embodiment, (b) is a fragmentary sectional view of the gasket.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injector 2 Housing 2a Fitting cylinder part 2b Gasket attachment part 3 Gasket 3a Through-hole 31 Core material 31a Flat ring part 31b Restraint part (claw member)
31ba, 31bb Bent part 31bc Convex part 31bd Cut and raised claw part 31c Cylindrical part 32 Seal part 4 Body 5 Mounting concave part 6 Injection port

Claims (6)

A gasket that is interposed between two members of a fitting cylinder part and a fitting receiving part fitted therein, and seals between the two members,
A core material provided with a through hole, and a seal portion fixed and integrally formed by vulcanization adhesion of a rubber material along the inner peripheral edge portion of the core material. The core material is formed by the through hole. A gasket comprising: a flat annular portion formed therein; and a restraining portion that is coupled to the flat annular portion and is formed so as to restrain the fitting tube portion. The gasket according to claim 1,
The gasket characterized in that the restraining portion is made of a claw member. The gasket according to claim 2,
The gasket, wherein the claw member is formed with a bent portion that is convex on the fitting tube portion side. The gasket according to claim 2 or 3,
The gasket is characterized in that the claw member is formed in a cylindrical portion concentrically coupled with the through hole on the outer peripheral edge portion of the core member. The gasket according to claim 3,
The gasket, wherein the claw member is further coupled with a bent portion that is convex on the opposite side of the fitting tube portion. The gasket according to claim 1,
The restraining portion is formed in a cylindrical portion concentrically connected to the through hole on the outer peripheral edge portion of the core material, and is a convex bent portion or a raised nail that is convex on the fitting tube portion side. A gasket characterized by comprising a part.

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