JPH0648447A - Structure of fluid feeding/discharging port of resin container - Google Patents

Abstract

PURPOSE:To provide a structure for a fluid feeding/discharging port of a container made of resin, the sealability between the resin and a metal of which is secured. CONSTITUTION:A fluid feeding/discharging port 2 of a container made of resin 1 is constituted in such a manner that an approximately cylindrical shape mouthpiece 3 made of a metal is embedded in the resin, and a rubber 5 is made to exist at least on one part of the outer peripheral surface of the mouthpiece 3, which is the surface coming into contact with the resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a fluid supply / discharge port of a resin container in which a chamber or / and a piston of an air spring used in, for example, an air suspension for vehicles is molded of a synthetic resin material. is there.

[0002]

2. Description of the Related Art In conventional containers, such as air springs, in which pressure fluid is supplied and discharged, chambers and pistons are made of metal. In recent years, however, the chambers and pistons have been molded from synthetic resin materials for the purpose of weight reduction and cost reduction. Resin containers have been developed. In order to provide such a resin container with a metal cap for connecting pipes that control the supply and discharge of fluid into the container, set the cap as an insert member in the mold, and The mold is formed by injecting a resin or the like, and the die is embedded in the resin after the molding.

[0003]

In the conventional structure of the fluid supply / discharge port in which the metal base is embedded and attached in the resin, there is a problem in the sealing property between the resin and the metal. In particular, when a thermoplastic resin is used as the container material, the resin shrinks when cooled, so that it is difficult to completely bond the resin and the metal. Further, since there is a large difference in the coefficient of thermal expansion between the resin and the metal, there is a possibility that a fine gap may occur between the resin and the metal due to the temperature rise during use of the container.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a structure of a fluid supply / discharge port of a resin container in which a sealing property between a resin and a metal is ensured.

[0005]

In order to achieve the above-mentioned object, according to the present invention, a fluid supply / discharge port of a resin container is formed in a form in which a substantially cylindrical metal base is embedded in resin. A rubber is interposed on at least a part of the outer peripheral surface of the mouthpiece on the surface where the mouthpiece and the resin come into contact with each other.

[0006]

In the present invention, since the rubber is interposed between the resin and the metal, the difference in the coefficient of thermal expansion between the resin and the metal is absorbed by the rubber, and the sealing property is ensured.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. In the embodiment shown in FIG. 1, the fluid supply / discharge port 2 of the resin container 1 is configured such that a substantially cylindrical metal base 3 is embedded in the resin. A female screw 4 for connecting to pipes is formed on the inner peripheral surface of the base 3.
In this embodiment, the rubber 5 is provided between the outer peripheral surface of the base 3 and the resin.
Is provided. As the resin container for supplying and discharging the fluid, the container described in JP-A-62-9067 and JP-A-62-55207, which the applicant of the present application has already applied, can be used. To attach the base 3 to the resin container 1, the rubber 5 is vulcanized and adhered to the outer peripheral surface of the cylindrical metal having the internal thread 4 formed in advance on the inner peripheral surface. The surface of the vulcanized rubber 5 is subjected to an adhesion treatment with a resin, for example, an activation treatment of the rubber surface (roughening the surface with a solvent) or further applying an adhesive to the surface of the rubber 3 whose surface is roughened with a solvent. Then, this is set in a mold and the shape of the resin container 1 is integrally injection-molded with a synthetic resin material. The material of the resin container 1 is 6
It is preferable to use a thermoplastic resin such as -6 nylon mixed with a reinforcing material such as glass fiber. If the rubber 5 is vulcanized and adhered to the metal, the airtightness between the two becomes reliable. Further, the adhesion between the rubber 5 and the resin also ensures the airtightness between the two by activating the rubber surface. Further, if a resin material is injection-molded, the rubber 5 is compressed in the direction of the mouthpiece 3 by the injection pressure, and after the resin is cooled and solidified, the mouthpiece 3, the rubber 5, and the resin are reliably bonded. .

In the embodiment shown in FIG. 2, a head 3A is provided on the mouthpiece 3, and the shape of the head 3A is non-circular as shown in FIG. 3, so that when the pipes are screwed into the mouthpiece 3, the mouthpiece 3A This prevents the cap 3 from rotating and at the same time prevents the cap 3 from slipping out downward in the axial direction. Even if such a head 3A is not provided, if the entire shape of the base 3 is formed into a polygonal tubular shape, the rotation of the base 3 is similarly prevented.

In another embodiment shown in FIGS. 4 and 5, a concavo-convex process (knurling or the like) 6 is performed on the outer peripheral surface of the circular head 3A.
This is an example in which the rotation of the mouthpiece 3 and the slip-out in the axial direction are prevented by applying the above.

Another embodiment shown in FIGS. 6 and 7 shows an embodiment in which a female thread is formed on the piping side and a male thread 7 is formed on the mouthpiece 3 side. Embedded inside. In this example, rubber 5
Is provided so as to contact the lower surface side of the head 3A of the mouthpiece 3 and a part of the outer peripheral surface of the mouthpiece 3 in contact with the lower surface side. Concavo-convex processing 6 is also applied to the outer peripheral surface of the head 3A of the base 3.

In the embodiment shown in FIGS. 8 and 9, instead of performing the uneven processing 6, a part of the head 3A is cut out to prevent the base 3 from rotating. In the embodiment shown in FIGS. 10 and 11, an example in which a collar portion 3B similar to the head portion 3A is formed on the outer peripheral surface of the mouthpiece 3 to prevent the mouthpiece 3 from slipping out vertically or vertically in the axial direction, FIG. 1 is shown on both of the parts 3A and 3B.
A notch for detent as shown in 1 is formed.

The embodiment shown in FIGS. 12 and 13 has a head portion 3A similar to that of the embodiment shown in FIG. 8, but the base 3 is formed with a male screw 7.

As a detent for the base 3, the head 3A
Alternatively, instead of the one part on one side on the circumference of the flange portion 3B being cut out, the one part may be cut out on both sides as shown in FIG.

In the embodiment shown in FIG. 15, as in the embodiment shown in FIG. 10, the base 3 is prevented from slipping out in both the upper and lower directions of the axial direction, but it has a collar portion 3B and a head portion 3A. The difference is that the rubber 5 is also provided between them.

The embodiment shown in FIGS. 16 to 18 shows an example in which an O ring is interposed as the rubber 5 between the die 3 and the resin material. An O-ring (rubber 5) is fitted to the outer periphery of the die 3 having the shape shown in FIGS. 16 to 18 (each has a recess into which the O-ring fits), and the die 3 having the O-ring fitted therein is die-molded. And the shape of the resin container 1 is integrally injection-molded with a synthetic resin material. In the embodiment shown in FIG. 16, one O-ring is used, and a part of the resin material penetrates into the outer circumference of the mouthpiece 3. It is prevented from slipping out either above or below the axial direction. The embodiment shown in FIG. 17 uses two O-rings, and the embodiment shown in FIG.
One ring is used and the resin material does not enter the base 3.

[0016]

As described above, according to the present invention, the outer peripheral surface of a part of the metal die embedded in the resin does not directly contact the resin, but contacts through the rubber, The airtightness at the location of the fluid supply / discharge port formed by the die embedded in the resin material is ensured. Further, the difference in the coefficient of thermal expansion between the resin and the metal is absorbed by the rubber, and a gap is not formed at the portion where the mouthpiece and the rubber are embedded due to the temperature rise during use.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment.

FIG. 3 is a plan view showing the head of the base used in FIG.

FIG. 4 is a sectional view showing a third embodiment.

5 is a plan view showing a head portion of the base used in FIG. 4. FIG.

FIG. 6 is a sectional view showing a fourth embodiment.

FIG. 7 is a plan view showing the head of the base used in FIG.

FIG. 8 is a sectional view showing a fifth embodiment.

9 is a plan view showing the head of the base used in FIG. 8. FIG.

FIG. 10 is a sectional view showing a sixth embodiment.

11 is a plan view showing the head of the base used in FIG. 10. FIG.

FIG. 12 is a sectional view showing a seventh embodiment.

FIG. 13 is a plan view showing the head of the mouthpiece used in FIG.

FIG. 14 is a plan view showing a modified example of the base.

FIG. 15 is a sectional view showing an eighth embodiment.

FIG. 16 is a sectional view showing a ninth embodiment.

FIG. 17 is a sectional view showing a tenth embodiment.

FIG. 18 is a sectional view showing an eleventh embodiment.

[Explanation of symbols]

 1 Resin container 2 Fluid supply / discharge port 3 Base 5 Rubber

Claims (1)

[Claims] 1. A fluid supply / discharge port of a resin container is formed by embedding a substantially cylindrical metal base into the resin, and at least a part of the base on the surface where the base and the resin come into contact with each other. A fluid supply / discharge structure for a resin container, characterized in that rubber is interposed on the outer peripheral surface.