JP2777005B2 - Hose fitting - 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 fitting for hermetically connecting a hose and a pipe forming a fluid passage.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a hose fitting for connecting a cooler hose used in a vehicle cooling system.
The hose fitting 100 includes an aluminum pipe 102 to which the hose 101 is fitted, and a cylindrical shell 103 attached to the outer periphery of the pipe 102. The hose 101 fitted to the outer periphery of the pipe 102 is fixed by the shell 103. It is fixed. And
A steel insert 104 is inserted into the inner periphery of the pipe 102 as a reinforcing material in order to reduce the amount of deformation of the pipe 102 due to caulking of the shell 103.

[0003]

However, when the insert 104 is used as a reinforcing material as described above,
It is necessary to fix the insert 104 in the pipe 102. Conventionally, bulge processing is performed on the inner surface of the pipe 102 on the tip side of the insert 104 so as to sandwich both ends of the insert 104, and the tip of the pipe 102 on the rear end side of the insert 104 is conventionally provided. This was handled by contracting the part.
For this reason, there has been a problem that the number of manufacturing steps increases and the cost increases. The present invention has been made based on the above circumstances, and an object of the present invention is to provide a hose fitting that can reduce the number of manufacturing steps for assembling an insert and reduce costs.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises caulking a pipe through which a fluid passes, and a hose attached to the outside of the pipe and fitted around the pipe. In a hose fitting having a tubular shell to be fixed and an insert inserted into the inner periphery of the pipe in order to reduce the amount of deformation of the pipe due to caulking of the shell, the outer diameter of the insert is The pipe is formed slightly larger than the inner diameter of the pipe, and a slit is provided over the entire length .
After the rear lance is inserted into the pipe with elastic deformation that decreases in the circumferential direction, the shell is caulked.
As a result, the clearance of the slit substantially disappears and becomes rigid.
Being a body is a technical means.

[0005]

According to the hose fitting of the present invention having the above-described structure, a pie
The insert inserted into the inner circumference of the pipe is held in the pipe by the elastic force of the insert itself which is about to expand in the radial direction. Then, a hose fitted to the outer circumference of the pipe
Caulking the shell from the outside of the insert clearance
Is substantially extinguished, the insert becomes rigid and pie
It functions as a reinforcing material for the loop. In addition, "substantially"
Means that the clearance is completely over the entire length of the insert
It means that there is no need to disappear. That is, clear
If the lance is not completely extinguished, the insert
What is necessary is just to be able to function as a reinforcing material.

[0006]

FIG. 1 shows an embodiment of a hose fitting according to the present invention.
A description will be given based on FIG. FIG. 1 is a sectional view of a hose fitting. The hose fitting 1 is used for a cooler hose of a vehicle cooling system, and includes a pipe 2 connected to a discharge port or an inlet of each functional component constituting a refrigeration cycle, and a hose fitted to the pipe 2. 3 (FIG. 3
(See FIG. 2) and an insert 5 inserted into the inner periphery of the pipe 2.

The pipe 2 is formed by cutting a cylindrical member of an aluminum alloy into a predetermined size, and has a tip (the right end in FIG. 1).
The inner peripheral corner is chamfered. Three peripheral grooves 2 a for ensuring a sealing property with the hose 3 fitted to the pipe 2 and a shell 4 are provided on the outer peripheral surface of the distal end of the pipe 2.
And one peripheral groove 2b for mounting the same. Further, a coating layer (not shown) is formed on the outer peripheral surface of the pipe 2 to which the hose 3 is fitted so as to increase the life of the seal between the pipe 3 and the hose 3. This coating layer is formed by applying a coating agent such as a synthetic resin liquid paint or a rubber paint that deteriorates little even under high temperature conditions to the outer peripheral surface of the pipe 2 and then performing a heat treatment. The shell 4 is formed by cutting a cylindrical member of an aluminum alloy into a predetermined length, then bending one end side (the left side in FIG. 1) inward and pressing the shell into a predetermined shape. The shell 4 is fixed to the pipe 2 by being fitted to the outer periphery of the pipe 2 and then fitting the inner peripheral edge of the end bent inward into the circumferential groove 2b.

The insert 5 is used as a reinforcing material for reducing the amount of deformation of the pipe 2 due to caulking of the shell 4, and is made of a high-strength metal such as stainless steel. The insert 5 is press-formed into a pipe shape, and a slit 6 having a constant width is formed on the peripheral wall over the entire length as shown in FIG. The outer diameter of the insert 5 is formed to be slightly larger than the inner diameter of the pipe 2.
When inserting the pipe into the pipe 2, clear the slit 6
The insert 5 is inserted into the pipe 2 while reducing the outer diameter of the insert 5 with elastic deformation so as to reduce the distance . Therefore, the insert 5 inserted into the pipe 2 is held in the pipe 2 by the elastic force of the insert 5 itself which is about to expand in the radial direction. Slit 6 provided in insert 5
After the insert 5 is inserted into the pipe 2, the shell 4
The clearance of the slit 6 becomes zero by caulking
It is designed to (disappear) . That is, after the pipe 2 is deformed to a certain dimension by the caulking of the shell 4, the clearance of the slit 6 disappears (becomes zero) and becomes a cylindrical rigid body. Works. The insert 5 is chamfered at the outer peripheral corners at both ends. Therefore, when inserting the insert 5 into the pipe 2, the chamfers of both the pipe 2 and the insert 5 serve as a guide. The hose 3 is a rubber tube having a reinforcing braid layer formed therein, and is cut to a predetermined length. Then, as shown in FIG. 3, after being inserted into the space formed between the pipe 2 and the shell 4,
By caulking the outer periphery of the shell 4 at several places, the connection with the pipe 2 is made airtight.

[0009] Hose fitting 1 having the above-described structure, by the outer diameter of the insert 5 is slightly larger than the inner diameter of the pipe 2, and and the slit 6 provided in the insert 5, Sri
Insert 5 with the clearance of cut 6 reduced
After being inserted into the pipe 2, the insert 5 is held in the pipe 2 by the elastic force of the insert 5 itself. Therefore, it is not necessary to perform the bulging process and the contraction process for fixing the insert 5 in the pipe 2 unlike the related art. In addition, conventionally, when inserting a steel insert into the pipe, there was a problem that the inner surface of the aluminum pipe was scraped off. However, in this embodiment, the diameter of the insert 5 is reduced and the inner diameter of the pipe 2 is reduced. The inner surface of the pipe 2 can be reduced when the insert 5 is inserted. Furthermore, insert 5 is connected to pipe 2
It is possible to reduce the insertion force when inserting the inside.
In this embodiment, the slits 6 of the inserts 5 are formed linearly in the axial direction. However, if the slits 6 are linear as described above, for example, when a large number of inserts 5 are stored in one box, In such cases, the slits 6 may be entangled with each other. Therefore, the slit 6 may be formed in a jagged shape.

[0010]

According to the hose fitting of the present invention, bulging and contracting for preventing the insert inserted into the pipe from falling off are not required, and the cost is reduced along with the reduction in the number of manufacturing steps. be able to.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hose fitting.

FIG. 2 is a cross-sectional view illustrating a manufacturing process of a hose fitting.

FIG. 3 is a cross-sectional view of a hose fitting showing a state where a hose is connected.

FIG. 4 is a half sectional view of a hose fitting according to the prior art.

[Explanation of symbols]

 1 Hose bracket 2 Pipe 3 Hose 4 Shell 5 Insert 6 Slit

Continuing on the front page (72) Inventor Shigeo Kubota 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. Inventor Yoshihito Fujimoto 1000, Toyoshina, Toyoshina-cho, Minami-Azumi-gun, Nagano Prefecture (56) References: JP-A 51-139423 (JP, U) JP-A 53-977818 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) F16L 33/00 35/00

Claims (1)

(57) [Claims] 1. A pipe through which a fluid passes, a tubular shell attached to the outside of the pipe and caulking and fixing a hose fitted to the outer periphery of the pipe, and a pipe formed by caulking the shell. In order to reduce the amount of deformation, a hose fitting having an insert inserted into the inner periphery of the pipe, wherein the outer diameter of the insert is formed slightly larger than the inner diameter of the pipe, and a slit is formed over the entire length. Is provided, and the clearance of this slit decreases in the circumferential direction.
After being inserted into the pipe with the that elastic deformation, the
By caulking the shell, the clearer of the slit
A hose fitting characterized in that the hose substantially disappears and becomes a rigid body .