JPH017909Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a hose having a special end structure.

(Prior Art) Conventionally, hoses for fuel systems or lubrication systems for automobiles, for example, have been the first choice in terms of oil resistance (fuel oil resistance, lubricating oil resistance, etc.), weight reduction, cost, etc.
As shown in Figures 2 to 2, resin hoses or resin-rubber composite hoses in which at least the innermost layer is made of thermoplastic resin have come into use. Fig. 1 shows a resin hose A consisting of a thermoplastic resin tube 1, and Fig. 2 shows a resin-rubber composite hose B in which a rubber outer layer 3 is provided on the outer surface of a thermoplastic resin inner layer 2.
It is.

(Problem to be solved by the invention) In order to use such a hose for the above purpose, a connecting pipe (metal pipe) is usually connected to the end of the hose (if necessary, a band or clip is attached from the outside of the end of the hose). etc.), but there are drawbacks described below.

In other words, in a hose with such a structure, it is difficult to insert the connecting pipe into the hose end (the inner surface of the hose and the outer surface of the connecting pipe do not easily slip), and it is difficult to insert the connecting pipe into the hose end. (High stress is required to expand the inner diameter of the hose.) Furthermore, there is a drawback that it is time-consuming to attach and detach the connecting pipe from the hose when inspecting the hose.

In addition to these drawbacks, the inner surface of the hose and the outer surface of the connecting pipe have many irregularities and surface scratches, and the lack of adhesion between the inner surface of the hose and the outer surface of the connecting pipe makes it easy for fluid to leak. It has the disadvantage that it must be firmly tightened with a screw or clip.

Furthermore, with such a structure, no matter how tightly the hose is tightened from the outside surface, the hose will deform in the radial or longitudinal direction each time pressure is applied due to the pressure that is repeatedly applied to the inside of the hose during use.
This deformation tends to create a gap between the inner surface of the hose and the outer surface of the connecting tube, which has the disadvantage of reducing adhesion and causing fluid leakage.

The present invention has been devised based on the above circumstances, and has a special end that eliminates the above-mentioned conventional drawbacks and has excellent ease of insertion and removal of the connecting pipe to the end of the hose, as well as excellent sealing resistance. The object of the present invention is to provide a hose having a structure.

(Means for Solving the Problems) The present invention provides a hose whose innermost layer is made of a thermoplastic resin and whose inner circumferential surface at its end is integrated with a fitting member, which The parts are
It is formed by providing a thin layer made of thermoplastic resin that can be fused to the innermost layer of the hose on the outer peripheral surface of a cylindrical rubber body, and the thin layer of the coupling member and the innermost layer of the hose are integrated by fusion. This article focuses on hoses with special end structures.

(Example) Hereinafter, the present invention will be explained in detail based on an example.

FIG. 3 shows an embodiment of the present invention, in which a rubber cylindrical body 30a is attached to the end of a hose 100 having a rubber outer layer 20 on the outer surface of a thermoplastic resin inner layer 10.
A joint member 30 having a thin thermoplastic resin layer 30b provided on the outer surface of the joint member 30 is inserted.
The thin layer 30b of the hose 100 and the inner layer 10 of the hose 100 are fused and integrated.

In the present invention, thermoplastic resins constituting at least the innermost layer include polyamide resins (nylon 6, nylon 6,6, nylon 11, nylon 12, etc.), polyester resins, polyurethane resins, polyolefin resins (polyethylene resins, polypropylene resins, etc.) etc. may be selected and used as appropriate depending on the purpose and use. For example, fuel system hoses for automobiles use polyamide resins (such as nylon 11) with excellent gasoline resistance, and lubricating system hoses use polyester resins in addition to polyacid resins.

The thickness of the resin can be appropriately selected from thin to thick, but from the viewpoint of cost and lightness, a thickness in the range of 0.1 to 3 mm is usually used.

In addition, hoses can be manufactured by using the thermoplastic resin alone, or by using the thermoplastic resin as an inner layer and providing a rubber outer layer on the outer surface. A method such as sulfur bonding may be used, and a reinforcing layer may be provided between the resin inner layer and the rubber outer layer, if necessary.

The rubber material of the cylindrical body constituting the joint member of the present invention is fluorocarbon rubber, acrylonitrile, etc.
Butadiene rubber, epichlorohydrin rubber, chlorosulfonated polyethylene rubber, chlorinated polyethylene rubber, etc. are appropriately selected and used depending on the purpose and use. For example, when used in fuel hoses for automobiles, fluorocarbon rubber and acrylonitrile-butadiene rubber, which have excellent gasoline resistance, are used, and when used in lubricating hoses, chlorosulfonated polyethylene rubber, chlorinated polyethylene rubber, etc. are used. used.

Further, the shape of the cylindrical body is not particularly limited, but a normal cylindrical shape or one having a flange portion at one end thereof may be used.

Further, as the material of the thin layer constituting the joint member of the present invention, a thermoplastic resin that can be fused to the innermost layer of the hose is appropriately selected and used depending on the purpose and use. The thermoplastic resin used in this case is also the same as described above. The thickness of this thin layer can be determined as required, but it is usually in the range of 0.05 to 0.5 mm. Formed by adhesion.

Furthermore, in the present invention, the thin layer of the coupling member and the innermost layer of the hose are integrated by a fusion method using heat, ultrasonic waves, high frequency, or the like.

(Effects of the invention) Since the hose of this invention has a special coupling member integrated in advance by fusion at the end that is to be connected to the connecting pipe, the connecting pipe does not require special treatment for connection. In addition, the inner circumferential surface of the end of the hose in contact with the outer circumferential surface of the connecting tube is made of highly elastic rubber, making it easy to insert and remove from the connecting tube, and also has an excellent sealing connection structure. can be provided.

In addition, the hose of the present invention, which can provide a non-adhesive connection structure, has excellent insertion and removal properties as described above, making it extremely easy to maintain in the market. It is also advantageous in terms of cost when replacing.

[Brief explanation of drawings]

1 and 2 are longitudinal sectional views showing a conventional hose end structure, FIG. 3 is a longitudinal sectional view showing an embodiment of the hose end structure of the present invention, and FIG. 4 is a longitudinal sectional view showing an embodiment of the hose end structure of the present invention. It is a longitudinal cross-sectional view showing a state in which a connecting pipe is connected to the hose of the invention. DESCRIPTION OF SYMBOLS 10... Inner layer, 20... Outer layer, 30... Joint member, 30a... Cylindrical body, 30b... Thin layer, 4
0... Connection pipe, 100... Hose.

Claims (1)

[Claims for Utility Model Registration] A hose whose innermost layer is made of a thermoplastic resin and has a coupling member integrated into the inner peripheral surface of its end, the coupling member being a rubber cylinder. It is formed by providing a thin layer made of a thermoplastic resin that can be fused to the innermost layer of the hose on the outer peripheral surface of the shaped body, and the thin layer of the coupling member and the innermost layer of the hose are integrated by fusion. A hose characterized by: