JP2907251B2 - Hose connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose connecting method.

[0002]

2. Description of the Related Art As a conventional hose connection structure, for example, a hose connection structure disclosed in Nissan Motor Co., Ltd., March, 1978, published on Mar. 1978, page 117, or as shown in FIG. Things are known.

A connector 1 is made of nylon filled with 20% glass fiber. The connector 1 is installed in an engine room, and has a connection port 2 to which a fuel pipe (not shown) is connected, and a connection portion 3 to which a hose 11 made of nylon 11 for sending fuel is connected. . This connection part 3
It has a so-called “bamboo shoot opening” having irregularities formed on the surface.

A method of connecting the hose 4 to the connecting portion 3 of the connector 1 is as follows.
a is heated and thermally expanded, and the heated end 4 a is inserted into the connection portion 3. Thereafter, while the end 4a of the inserted hose 4 is gradually cooled, the end 4a of the hose 4 contracts, and a connection state is brought into close contact with the uneven surface of the connection portion 3.

[0005]

However, in such a conventional technique, shrinkage after heating is used to
Since the method of connecting the end portion 4a of the hose 4 to the connection portion 3 of the connector 1 is adopted, when the hose 4 is heated again, the hose 4 undergoes thermal expansion and easily comes off from the connection portion 3 of the connector 1. Therefore, when the hose 4 and the connector 1 connected by such a connection method are used in an automobile engine room, they must be installed as far as possible from a device where the temperature becomes high. The degree of freedom is reduced.

The present invention has been made by paying attention to such a conventional technique, and provides a hose connecting method that makes it difficult for a hose to be pulled out of a connector connecting portion even when heat is applied.

[0007]

According to the hose connecting method of the present invention, in order to achieve the above object, a resin hose is inserted into a cylindrical connecting portion of a connector having an uneven surface, and then the hose is connected. The connecting portion with the hose inserted is arranged in the injection mold, and a resin material having a linear thermal expansion coefficient equal to or less than the linear thermal expansion coefficient of the connecting portion is injected at least to the outer peripheral portion corresponding to the connecting portion of the hose, The heat and the pressure at the time of the injection make the hose into an uneven state corresponding to the uneven surface of the connection portion, and also form a collar portion which is integrally welded to the hose.

[0008]

Since the collar portion is formed by injecting the resin material into the outer peripheral portion of the hose inserted into the connection portion of the connector, a high temperature and a high pressure are applied to the outer peripheral portion of the hose during the injection. Therefore, the heat and pressure at this time cause the hose to be in an uneven state corresponding to the uneven surface of the connection portion. In addition, the inner surface of the collar portion formed by injection at the outer peripheral portion of the hose also becomes uneven in accordance with the unevenness of the hose, and the inner surface of the collar portion and the outer peripheral portion of the hose are heated at the time of injection. As a result, the hose and the collar part are completely integrated.

In addition, the resin material forming the collar has a coefficient of linear thermal expansion that is equal to or less than the coefficient of linear expansion of the material forming the connecting portion of the connector. For example, even when used in a high-temperature atmosphere in an engine room, the expansion rate of the collar section is equal to or less than the expansion rate of the connection section, and at least the binding force of the hose by the collar section is maintained, and the hose comes off. Is prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In addition, the same reference numerals are given to portions common to the related art, and overlapping description will be omitted.

1 to 3 show a first embodiment of the present invention. In this embodiment, first, the end 4a of the hose 4 that has been heated and thermally expanded is inserted and connected to the connecting portion 3 of the connector 1 as in the related art (see FIG. 1). The connector 1 is made of nylon filled with 20% glass fiber as in the conventional case.

Then, the connector 1 to which the hose 4 is connected in this manner is set in an injection mold 5 (see FIG. 2). Although not shown, the injection mold 5 is of a left-right split type, and a cavity 6 is formed so as to surround the outer peripheral portion of the hose 4 just inserted into the connection portion 3. Next, the cavity 6 is introduced through the introduction path 7.
Inject high-temperature resin material into the inside. This resin material is a nylon material filled with 30% glass fiber, and has a smaller coefficient of linear thermal expansion than the resin material forming the connector 1 (nylon filled with 20% glass fiber). Since this high-temperature resin material is injected at a high pressure, a high temperature and a high pressure are simultaneously applied to the outer peripheral portion of the hose 4 at the time of injection, and the hose 4 has an uneven state completely corresponding to the uneven surface of the connecting portion 3. Become. Also, since the hose 4 itself is in an uneven state, the injected resin material (after cooling, the collar 8
The inner surface 8a of the hose 4 also becomes uneven, and the inner surface 8a and the surface of the hose 4 are welded by the heat of the high-temperature resin material.

After the resin material in the cavity 6 has cooled and solidified, the connector 1 and the hose 4 are taken out of the injection mold 5. A short cylindrical collar portion 8 is formed on the outer peripheral portion of the end 4a of the hose 4 taken out of the injection molding die 5, and the connection operation of the hose 4 to the connection portion 3 is completed (FIG. 3).

Even if the hose 4 to which the connector 1 is connected in advance in this way is used, for example, in a high-temperature atmosphere in an engine room, the collar 8 formed on the outer peripheral portion of the hose 4 will 3, the degree of expansion of the connecting portion 3 is larger than that of the collar portion 8 when heated, so that the binding force of the collar portion 8 to the hose 4 is reduced. As a result, the hose 4 is reliably prevented from coming off. In addition, due to the application of high temperature and high pressure during injection molding, the hose 4 is in an uneven state corresponding to the uneven surface of the connecting portion 3, and the inner surface 8a of the collar portion 8 is also in an uneven state corresponding to the hose 4. The hose 4 is more reliably prevented from coming off.

FIG. 4 shows a second embodiment of the present invention. In this embodiment, the injection mold 5 in the above embodiment is used.
The cavity 6 is slightly expanded to form a wide collar portion 9. That is, the connector 1 extends from the outer peripheral portion of the hose 4 beyond the end of the hose 4 to the collar portion 9.
Is formed integrally with the extension 9b reaching the surface. Thereby, the binding force between the hose 4 and the connection part 3 is improved, and the sealing property between the hose 4 and the surface of the connection part 3 is further improved. That is, the inner surface 9a of the collar portion 9 is
This is because the welding is performed in a state of straddling the surface of the connector 4 and the surface of the connector 1. Other configurations, functions, and effects are the same as those of the previous embodiment, and redundant description is omitted.

[0016]

The method for connecting a hose according to the present invention has the contents as described above, and forms a collar portion by injecting a resin material into an outer peripheral portion of a hose inserted into a connecting portion of a connector. Therefore, high temperature and high pressure are applied to the outer peripheral portion of the hose at the time of injection, so that the inner surfaces of the hose and the collar portion are each in an uneven state corresponding to the uneven surface of the connecting portion, and the hose is hard to come off from the connecting portion.

Further, since the resin material forming the collar portion has a linear thermal expansion coefficient equal to or less than the linear thermal expansion coefficient of the material forming the connection portion of the connector, the connected hose and the connector can be used. For example, even when used in a high-temperature atmosphere in an engine room, the expansion rate of the collar portion is equal to or less than the expansion rate of the connection portion, and the binding force of the hose by the collar portion is at least maintained, and the hose does not come off It is surely prevented.

[Brief description of the drawings]

FIG. 1, showing a first embodiment of the present invention, is a cross-sectional view showing a stage before a hose is inserted into a connection portion of a connector.

FIG. 2 is a cross-sectional view showing a state where a connector into which a hose is inserted is set in an injection mold.

FIG. 3 is a cross-sectional view showing a state where a collar portion is formed on an outer peripheral portion of the hose.

FIG. 4 is a sectional view, corresponding to FIG. 3, showing a second embodiment of the present invention.

FIG. 5 is a sectional view corresponding to FIG. 3, showing a hose and a connector connected by a conventional hose connection method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connector 3 Connection part 4 Hose 5 Injection mold 8, 9 Collar part

Claims (1)

(57) [Claims] 1. A resin hose is inserted into a cylindrical connecting portion of a connector having an uneven surface, and a connecting portion in a state where the hose is inserted is arranged in an injection mold, and a linear thermal expansion of the connecting portion is performed. the resin material having a linear thermal expansion coefficient of less coefficients, is injected into the outer peripheral portions corresponding to the connection portion of at least the hose, the injection
The hose is adapted to the uneven surface of the connection part by the heat and pressure when it comes out.
As well as welded together with the hose
Connection hose, characterized in that that the formation of the collar portion.