JPH0821585A - End part structure for hose - Google Patents

Abstract

PURPOSE:To eliminate the waste of material and also prevent a hose inner diameter from narrowing by forming a coupling member integrally with the hose by hard resin so that the hose end part can be diameter-expanded and also at least part of the hose end part can exist in the inner periphery of the diameter-expanded part. CONSTITUTION:In the end part structure of a hose as a conduit for fluid flowing, the end part of the hose 10 is diameter-expanded over given width to form a coupling member 14 integrally with the hose 10 by hard resin, or to integrate the coupling member 14 by thermal welding or adhesion so that part of the end part can exist in the inner periphery of the diameter-expanded part. At that time, the coupling member 14 is formed so as to be mounted around the end part of the hose 10 to be extended along the outer periphery of the end part to a part beyond the diameter-expanded part 12, resultingly preventing the extraction of the hose 10 from the coupling member 14. Also the inner diameter of the coupling member 14 in the inner periphery of the diameter- expanded part 12 is preferably nearly equalized to the inner diameter of the hose 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose end structure as a conduit through which a fluid flows.

[0002]

2. Description of the Prior Art The ends of hoses are usually connected to mating members, for which fitting members are fitted. In this case, the joint member is generally attached by screwing or tightening, but such a method cannot achieve sufficient integration,
In particular, when the high-pressure fluid was flowed, there was a problem that it leaked from this portion.

[0003]

Therefore, the Japanese Patent Publication No. 62-62
JP-A-020438 proposes a joint member integrally molded with a hose. However, in this method, a sleeve, which is a separate member, is inserted into the hose, and the joint member is integrally molded with the hose and the sleeve, so that the material is wasted. Further, since the inner diameter of the portion where the sleeve is inserted is reduced, the inner diameter is different from that of the hose. The present invention addresses such a problem, in which the end portion of the hose is expanded in diameter, and a joint member is directly formed on the inner circumference of the expanded diameter portion.

[0004]

SUMMARY OF THE INVENTION Under the above problems, according to the present invention, the end portion of a hose is expanded in diameter, and at least a part of the hose is made hard so that it exists on the inner circumference of the expanded portion. It is characterized by being integrally molded with a hose with resin. Further, in this configuration, the joint member extends around the end of the hose, extends along the outer periphery of the hose, and extends to a portion beyond the expanded diameter portion. Furthermore, the inner diameter of the hose and the joint member The inner diameter is set to be substantially the same.

[0005]

The present invention adopts the above means, that is,
By integrally molding so that a part of the joint member is present on the inner circumference of the expanded hose, it is possible to avoid waste of material and prevent the inner diameter of the hose from being narrowed. Further, by extending the joint member along the outer periphery of the hose to a portion beyond the enlarged diameter portion, a hose retaining structure can be achieved. Furthermore, by setting the inner diameter of the hose and the inner diameter of the joint member to be substantially the same, the flowability of the fluid passing through the inside is not adversely affected.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a hose in which a joint member is integrally molded at its end. According to the present invention, in short, the end portion of the hose 10 is expanded over a predetermined width, and at least a part of the joint member 14 is made of a hard resin so that the joint member 14 is integrated with the hose 10 so as to be present on the inner periphery of the expanded portion 12. It is a molded product.

Here, the hose 10 is preferably made of an elastic material such as rubber from the viewpoint of flexibility. In this case, a single layer, a multi-layer, a cord-reinforced one, a composite of rubber and resin, and even a resin only are considered. On the other hand, the joint member 14 is required to have a certain strength in terms of moldability and function, and thus a hard resin is suitable. Specifically, PA, POM, PPS, PBT, etc. are considered. In addition, a resin reinforced with glass fiber or the like is preferable for those used under high pressure.

By the way, in integrally molding the hose 10 and the joint member 14, the joint member 14 wraps around the end of the hose 10 along the outer periphery of the hose 10 and has an enlarged diameter.
It is preferable to extend to a portion beyond. This is because the hose 10 is prevented from coming out of the joint member 14 by doing so. Also, the expanded part 1
It is desirable that the inner diameter of the joint member 14 existing on the inner circumference of 2 is substantially equal to the inner diameter of the hose 10. This is because the inner diameter of the hose 10 is kept constant up to the end.

Incidentally, FIG. 1 shows a joint member 14 having a thread 16 formed on the outer periphery on one end side.
It has a structure in which this is screwed into a mating member for connection. Even if the joint member 14 has such a shape, it can be easily formed by using a mold described later.

FIG. 2 is an explanatory view showing an operation of expanding the diameter of the hose 10, but a plug-like member having a diameter larger than the inner diameter of the inner periphery of the end of the hose 10 which is a connecting portion with other parts. Jig 1
8 is inserted, and in this state, if it is made of rubber, it is vulcanized, and if it is made of resin, its shape is fixed by heating. As a result, the enlarged diameter portion 12 is formed in the end portion of the hose 10 over a predetermined width.

FIG. 3 is an explanatory view showing an operation of molding the joint member 14. First, the inner mold 20 is inserted into the inner circumference of the expanded portion 12. The inner mold 20 is a cylindrical body that passes through the enlarged diameter portion 12 and projects into the inner circumference of the hose 10. As a result, an annular mold inner space 22 is formed between the inner mold 20 and the enlarged diameter portion 12. Next, the outer periphery of the hose 10 is covered with an outer mold 24 made of a split mold. The outer mold 24 is formed with an outer mold space 26, a screw thread space 28, and an injection path 30 that match the shapes of the outer and outer ends of the hose 10 of the joint member 14. The inner space 22 of the mold, the thread space 28, and the outer space 26 of the mold form the shape of the joint member 14.

When the above operation is completed, if the resin is injected from the injection passage 30, it will be cooled and solidified, and the joint member 14 will be molded integrally with the hose 10. In this case, the joint member 14 and the hose 10 are integrated by thermal welding. If the integration is insufficient by heat welding alone, or if the material cannot be heat welded, it will be adhered. In the case of adhesion, an adhesive may be applied to the inner circumference and / or the outer circumference of the expanded diameter portion 12.

FIG. 4 is a cross-sectional view of the one-touch type coupling member 14 formed at the end of the hose 10. However, even the coupling member 14 having such a complicated structure is connected to the hose 10 in the same manner as described above. Can be integrally molded. In this case, it is significant to make the inner diameter of the joint member 14 and the inner diameter of the hose 10 substantially the same.

[0014]

EFFECTS OF THE INVENTION Since the present invention is as described above, that is, the end portion of the hose is expanded, and the hose is integrated with the hose so that a part of the joint member exists on the inner circumference of the expanded part. Since it is molded into, the joint member other than the hose is sufficient, and the waste of material can be saved. Further, it is possible to avoid the narrowing of the inner diameter of the hose as much as possible, and the flowability of the fluid passing through the inside is not adversely affected.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a hose in which a joint member is integrally molded at an end according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a diameter expansion operation of a hose showing an embodiment of the present invention.

FIG. 3 is an explanatory view of a molding operation of the joint member showing the embodiment of the present invention.

FIG. 4 is a cross-sectional view of a hose in which a joint member is integrally molded at the end according to the embodiment of the present invention.

[Explanation of symbols]

 10 hoses 12 expanded diameter portion 14 joint member

Claims (5)

[Claims] 1. The joint member is integrally formed with the hose by using a hard resin so that the diameter of the end of the hose is expanded and at least a part of the end of the hose exists on the inner circumference of the expanded part. Hose end structure. 2. The end of the hose according to claim 1, wherein the joint member extends around the end of the hose, extends along the outer circumference of the hose, and extends to a portion beyond the enlarged diameter portion. Part structure. 3. The hose end structure according to claim 1, wherein the inner diameter of the hose and the inner diameter of the joint member are set to be substantially the same. 4. The hose end structure according to any one of claims 1 to 3, wherein the joint member and the hose are integrated by heat welding. 5. The hose end structure according to any one of claims 1 to 3, wherein the joint member and the hose are bonded and integrated.