JPH11166684A - Branch hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To branch and connect a small-diameter hose at a position near the end of a large-diameter hose in a branch hose and dispense with any other connecting pipe or the like. SOLUTION: In a branch hose 10, the end of a small-diameter hose 15 is vulcanized to be bonded to a branch port 13 of a large-diameter hose 12. That is, the large-diameter hose 12 and the small-diameter hose 15 which are not vulcanized are produced, the branch port 13 is formed at the large-diameter hose 12, the small-diameter hose 15 is inserted into the branch port 13, and then, a large-diameter skirt shaped portion 14 and a small-diameter skirt shaped portion 16 are formed at the large-diameter hose 12 and the small-diameter hose 15, respectively, by smoothing by the use of a jig or the like. The resultant component is held inside a mold, to be vulcanized. Consequently, the large- diameter hose 12 and the small-diameter hose 15 are bonded to each other at the large-diameter skirt shaped portion 14 and the small-diameter skirt shaped portion 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch hose in which a large-diameter hose is branched and connected to a small-diameter hose.

[0002]

2. Description of the Related Art Conventionally, as an example of using such a branch hose in an automobile, there is known one shown in FIG.
FIG. 12 shows a connection system of a radiator hose 110 for connecting the engine 100 and the radiator 102.
The radiator hose 110 supplies the water cooled by the radiator 102 to the engine 100. The radiator hose 110 is branched and connected to a reservoir 116 via a connection pipe 112 and a branch hose 114. When the volume of the cooling water expands due to a rise in temperature, the cooling water flows through the branch hose 114 to the reservoir 116, whereby the volume of water in the cooling system is kept constant. In addition, bubbles generated in the cooling system are sent to the reservoir 116 through the branch hose 114 during circulation, and are discharged therefrom.

The connection pipe 112 is a resin pipe branched in three directions, and includes branch portions 112a, 112b, 11b.
2c is inserted into the hose 110a on the radiator 102 side, the hose 110b on the engine 100 side, and the branch hose 114, respectively, and fixed with a leaf spring clip 118, respectively.

[0004]

By the way, the air bubbles generated in the cooling system are generated in the radiator hose 110,
It is easy to collect on the top. In order to efficiently remove the air accumulated in the radiator hose 110 and effectively use the space, it is preferable to arrange the connection pipe 112 and the branch hose 114 near the upper end so as to approach the engine 100. However, the hose 110
An insertion margin L1 is required to connect b to the branch portion 112b. Further, a long straight portion 112 is required to form the branch portion 112c. Therefore, the connection pipe 11
2 itself becomes large, and there is a limit in bringing the position of the branch portion 112c closer to the engine 100 side.

Further, since the leaf spring clip 118 is used to connect the radiator hose 110 and the branch hose 114 to the connecting pipe 112, the number of parts increases and the assembling work is troublesome. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a branch hose which can provide a branch portion of a hose at a position close to an end, has a small number of parts, and is easy to assemble. The purpose is to:

[0007]

Means for Solving the Problems and Actions and Effects There are provided a large-diameter hose and a small-diameter hose smaller in diameter than the large-diameter hose and branched from the large-diameter hose. In the branch hose, a branch port formed on the side wall of the large-diameter hose and having an outer diameter substantially equal to the diameter of the small-diameter hose, a large-diameter connection portion formed around the branch port, and the small-diameter A small-diameter connection portion formed to expand the end of the hose, and inserting the small-diameter connection portion into the large-diameter hose through the branch port;
The small-diameter hose is vulcanized in close contact with the large-diameter joint to connect the small-diameter hose so as to branch off from the branch port.

In the branch hose according to the present invention, a branch port is formed in a side wall of a large diameter hose, and a small diameter hose is vulcanized and bonded so as to be connected to the branch port. That is, a large-diameter connection portion is formed around the branch port of the large-diameter hose, and a small-diameter connection portion is formed so as to expand the end of the small-diameter hose.
Then, the large-diameter connection portion and the small-diameter connection portion are brought into close contact and connected by vulcanization, but since the small-diameter connection portion is enlarged to be larger than the diameter of the branch port, the small-diameter connection portion is passed through the branch port. When the large-diameter connection and the small-diameter connection are brought into close contact with each other and inserted into the large-diameter hose, the small-diameter connection enters the inside of the large-diameter connection and is joined in a state where it is difficult to remove from the large-diameter hose. Strength increases.

The connection between the large-diameter connection portion and the small-diameter connection portion is performed by vulcanization bonding, and a connection pipe or the like as described in the prior art is unnecessary. No insertion margin is required, and the connection between the large-diameter hose and the small-diameter hose can be formed at a position close to the end of the large-diameter hose. Further, since the connecting pipe is not required, the number of parts can be reduced and the assembling work is easy.

[0010] As a preferred form of the large-diameter connection portion and the small-diameter connection portion, the large-diameter connection portion is formed in a large-diameter hem-shaped portion that hem-shaped and widens the periphery of the branch port. The portion is formed in a small-diameter hem portion that is formed so that the end portion of the small-diameter hose is hem-shaped and widened, and that is in close contact with the large-diameter hem portion. The large-diameter skirt portion and the small-diameter skirt portion can be easily formed by being closely adhered to each other with a molding die and formed by shaping.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the present invention will be described below.

FIG. 1 is an explanatory view showing a configuration in which a vehicle engine and a radiator are connected by a branch hose 10 according to an embodiment of the present invention. In FIG. 1, a branch hose 10 is provided between an engine EG and a radiator RG.
Is connected. The branch hose 10 is a large diameter hose 12
And a small diameter hose 15 branched from the large diameter hose 12. The large diameter hose 12 has a radiator RG at one end.
And the other end is connected to the engine EG. The small-diameter hose 15 has a reservoir RV at the other end.
It is connected to the.

FIG. 2 is an enlarged sectional view showing the vicinity of the connection between the large-diameter hose 12 and the small-diameter hose 15 constituting the branch hose 10. As shown in FIG.
Has a hose body 12a made of an EPDM rubber material, and a passage 12c through which cooling water flows in the hose body 12a.
Is provided. Further, the yarn layer 1 is provided in the hose body 12a.
2b is buried to reinforce the hose body 12a. A branch port 1 is provided on the side wall of the end of the large diameter hose 12.
The small-diameter hose 15 is connected so as to be connected to the branch port 13. Small diameter hose 15
Is substantially the same as the large-diameter hose 12, except that the diameter of the large-diameter hose 12 is 細 to 細, which is a thinner hose. The thread layer 15b is embedded and a passage 15c is provided.

A connecting portion between the large-diameter hose 12 and the small-diameter hose 15 is connected to the large-diameter hose 12 by a large-diameter hem portion 14 (large-diameter connecting portion).
The small-diameter hem portion 16 (small-diameter connection portion) is formed on the small-diameter hose 15 by hammering with a mold, and the small-diameter hem portion 16 is brought into close contact with the inside of the large-diameter hem portion 14 and vulcanized therebetween. It is configured by bonding. Vulcanization bonding is
The unvulcanized hose extruded body 12A and the hose extruded body 15A shown in FIG. 3 are bonded together with vulcanization.

Next, a method of manufacturing the branch hose 10 will be described. 3 to 9 are explanatory diagrams illustrating a series of manufacturing steps of the branch hose 10. As shown in FIG. 3A, first, an unvulcanized hose extruded body 12A for forming the large-diameter hose 12 is manufactured, and the small-diameter hose 15 is formed.
To produce a hose extruded body 15A. The hose extruded body 12A and the hose extruded body 15A are manufactured by an ordinary method, that is, by extruding with an extruder.
For example, using an EPDM rubber material, the yarn layer 12
b, 15b, and the inner diameter D1 of the hose extruded body 12A is 30 to 37 m.
m, thickness t1 is 4.5 mm, inner diameter D2 of hose extruded body 15A is 5.8 to 16 mm, and thickness t2 is 4 mm. Subsequently, a branch port 13 is formed in the side wall of the hose extruded body 12A to a diameter d1 of 12 to 21 mm by a drill or the like (FIG. 3B).

Next, a large-diameter hem portion 14 (FIG. 2) is formed at the branch port 13 of the hose extruded body 12A, and a small-diameter hem portion 16 (FIG. 2) is formed at the end of the hose extruded body 15A. Perform a habit forming step. Prior to performing the hammering step, as a preliminary treatment, a release agent 13a adhered to the inside of the peripheral edge of the branch port 13 of the hose extruded body 12A shown in FIG. 3B is removed using a solvent (such as gasoline). The release agent 13a is applied to easily release the hose extruded body 12A from a mandrel (not shown) when extrusion-molding the hose extruded body 12A, and hinders an increase in adhesive strength by vulcanization described later. Therefore, it is separated from the vicinity of the branch 13.

Subsequently, the branch port 13 of the hose extruded body 12A
Of the hose extruded body 15A and the end of the hose extruded body 15A. The hammering step is performed using the hammering tool 20 shown in FIG. The tool 20 includes a shaping die 21, a rod 22, and a support jig 23. The shaping mold 21 includes a side 21
a, an upper surface 21b, and a lower surface 21c, the shape of which is frustoconical. The upper surface 21b has a diameter d2 substantially equal to the diameter d1 of the branch 13 (see FIG. 3B). In addition, the side surface 21a is an inclined surface that hits the large-diameter skirt portion 14 shown in FIG. Further, the upper surface 21b is provided with a screw hole 21d.
A threaded portion 22a at the end of the rod 22 is screwed to d. On the other hand, the rod 22 has a thickness that can be inserted into the passage 15c of the small-diameter hose 15, and is screwed into the screw hole 21d of the shaping die 21 as described above. Also, the supporting jig 23
Is a U-shaped gripping portion 23 that can be fitted into the support groove 21e of the side surface 21a of the shaping die 21 at the tip end to support the shaping die 21.
a long member that can be inserted into the hose extruded body 12A.

As shown in FIG. 5, in order to perform a crimping using the crimping tool 20, first, the shaping die 21 is gripped by the gripping portion 23a of the supporting jig 23 to form the hose extruded body 12A. The shaping die 21 is inserted into the opening 12Aa and aligned with the branch opening 13. Subsequently, the rod 22 is connected to the hose extruded body 1.
5A is inserted into the passage 15c of the
Is inserted into the branch opening 13, and the screw portion 22 a is screwed into the screw hole 21 d of the shaping die 21, and the rod 22 is connected to the shaping die 2.
1 and connected together.

Subsequently, as shown in FIG. 6, the hose extruded body 15A is pushed down against the rod 22, and the end of the hose extruded body 15A is caused to follow the side surface 21a of the shaping mold 21 so as to be divergent. The small diameter skirt portion 16 is formed by curling. Subsequently, as shown in FIG. 7, the rod 22, the hose extruded body 15 </ b> A, and the shaping mold 21 are lifted up integrally, and the small-diameter hem-shaped portion 16 of the hose extruded body 15 </ b> A is brought up against the inner peripheral surface of the branch port 13. Thereby, the large-diameter skirt 14 is formed on the hose extruded body 12A. That is, the large-diameter skirt 14
Is formed into a mountain shape by expanding the branch port 13 and closely adhering on the small-diameter hem-shaped portion 16. At this time, since the hose extruded body 12A and the hose extruded body 15A are not vulcanized, the large-diameter hem portion 1
The habit shape of 4 and small diameter skirt 16 is maintained.

Next, a vulcanization bonding step is performed. 8 and 9
FIG. 4 is a view for explaining a vulcanization bonding step. The vulcanization bonding process is
This is performed using a molding die 30. The molding die 30 includes a mold 31 and a mold 32 constituting the cavity 30 a, a cylindrical mandrel 33, and a shaping mold 3 supported by the mandrel 33.
4 is provided. The cavity 30a includes a large-diameter portion 30b that is in close contact with the hose extruded body 12A, and the hose extruded body 1A.
A small-diameter portion 30c that is in close contact with 5A, and a divergent connecting portion 30d is formed between the small-diameter portion 30c and the large-diameter hem-shaped portion 14 therebetween.

In the vulcanization bonding step, first, the shaping mold 21 having the unvulcanized hose extruded body 12A and the hose extruded body 15A is replaced with a shaping mold 34. In other words, the shaping mold 21 is detached from the rod 22 and taken out by the support jig 23 by going through the steps reverse to those shown in FIGS. 7, 6 and 5. After that, as shown in FIG.
(See FIG. 5), inserted into the hose extruded body 12A, and screwed the rod 22 into the screw hole of the shaping mold 34. The shaping mold 34 has substantially the same configuration as the shaping mold 21, but differs in a configuration including an arc surface 34 a supported in contact with the mandrel 33. Subsequently, the mandrel 33 is inserted into the hose extruded body 12A, supported by the arc surface 34a of the shaping mold 34, and the molds 31 and 32 are further clamped (the state of FIG. 9). At this time, the outer peripheral surfaces of the hose extruded body 12A and the hose extruded body 15A are pressed by the molding surfaces of the molds 31 and 32, and the large-diameter hem-shaped portion 14 and the small-diameter hem-shaped portion 16 are held in close contact with each other.

Thereafter, the molding die 30 holding the hose extruded body 12A and the like is charged into a vulcanizing pot (not shown) and vulcanized.
The vulcanization is performed under the vulcanization conditions of the EPDM rubber material.
For example, it is set at about 150 ° C. for 30 minutes. As a result, the hose extruded body 12A and the hose extruded body 15A are vulcanized and bonded at the large-diameter hem portion 14 and the small-diameter hem portion 16, and the large-diameter hose 12 and the small-diameter hose 15 are integrated into the branch hose 1.
0 is completed.

According to the branch hose 10, the large-diameter hem-shaped portion 1 is connected to the large-diameter hose 12 to connect the small-diameter hose 15 thereto.
Since the resin pipe 4 and the small-diameter skirt 16 are formed and directly joined by vulcanization bonding, the resin pipe as described in the prior art is eliminated. Therefore, it is not necessary to insert a hose, which is necessary when a resin pipe is used, and the small diameter hose 15 can be branched from a position very close to the end of the large diameter hose 12 and used for a radiator hose of an engine. In this case, the small-diameter hose 15 can be branched from a position close to the engine, and the accumulation of air in the large-diameter hose 12 can be reduced.

Further, since a connecting pipe is not required unlike the prior art, the number of parts can be reduced because the large diameter hose 12 and the small diameter hose 15 are connected. In addition, the step of vulcanizing the large-diameter hose 12 and the small-diameter hose 15 and the step of bonding them together can be performed simultaneously, so that the cycle of the steps can be shortened.

Further, the small diameter hem portion 16 of the branch hose 10
Has an outer diameter larger than the diameter of the branch port 13, and the branch port 1
3, the bonding strength is high.

When the branch port 13 is formed in the large-diameter hose 12, the yarn layer 12 b of the large-diameter hose 12 is cut off. It is adhered and reinforced with the thread layer 15b of the small diameter hose 15. Therefore, a decrease in strength at the connection between the large diameter hose 12 and the small diameter hose 15 does not occur.

Further, the large diameter hose 12 and the small diameter hose 1
When the fifth yarn layers 12b, 15b are exposed to the passages 12c, 15c, the durability is impaired when the cooling water flowing through the passages 12c, 15c penetrates. But,
In the branch hose 10 according to the above embodiment, as shown in FIG.
The end portion 12k of the small-diameter hose 15 has a small-diameter hem-like portion 16 of the small-diameter hose 15.
And is not exposed to the cooling water flowing in the large diameter hose 12. The end of the small-diameter hose 15 is vulcanized in close contact with the shaping mold 34 and the mandrel 33 to form a yarn layer 1.
The periphery of the end 15k of 5b is crushed, and the end 15k of the thread layer 15b is not exposed to the passage 12c. Therefore, the yarn layer 1
Cooling water does not permeate into 2b and 15b, and is excellent in durability.

As shown in FIG. 11, the end of the yarn layer 15b is covered with a sealing material 18 so as to cover the yarn layer 15b.
The effect of preventing the cooling water from penetrating inside can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a branch hose 10 according to an embodiment of the present invention.
FIG. 4 is an explanatory diagram showing a configuration in which an engine EG of a vehicle and a radiator RG are connected by a dashed line.

FIG. 2 is an enlarged sectional view showing the vicinity of a connection portion between a large diameter hose 12 and a small diameter hose 15 constituting the branch hose 10.

FIG. 3 is a hose extruded body 12A for producing the branch hose 10.
It is sectional drawing which shows 15A of hose extruded bodies.

FIG. 4 is a perspective view showing a hammering tool 20 for hammering the hose extruded body 12A and the hose extruded body 15A.

FIG. 5 is an explanatory diagram for explaining a kinking process by the kink tool 20.

FIG. 6 is an explanatory diagram illustrating a habit forming step following the step of FIG. 5;

FIG. 7 is an explanatory view showing a habit forming step that follows the step of FIG. 6;

FIG. 8 is an explanatory view showing a vulcanization step.

FIG. 9 is an explanatory diagram illustrating a vulcanization step following FIG.

FIG. 10 is a sectional view showing a main part of the branch hose 10.

FIG. 11 is a sectional view showing a branch hose according to another embodiment.

FIG. 12 is an explanatory diagram illustrating a connection system of a radiator hose 110 that connects an engine 100 and a radiator 102 according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Branch hose 12 ... Large diameter hose 12a ... Hose main body 12b ... Thread layer 12c ... Passage 12b, 15b ... Thread layer 12c, 15c ... Passage 12k ... End part 12A ... Hose extruded body 12Aa ... Opening 13 ... Branch port 13a ... Separation Molding agent 14 ... Large-diameter hem portion 15 ... Small-diameter hose 15a ... Hose body 15b ... Thread layer 15c ... Pathway 15k ... End portion 15A ... Hose extruded body 16 ... Small-diameter hem portion 18 ... Seal material 20 ... Knitting tool 21 ... Forming die 21a ... side surface 21b ... upper surface 21c ... lower surface 21d ... screw hole 21e ... support groove 22 ... rod 22a ... screw part 23 ... support jig 23a ... gripping part 30 ... molding die 30a ... cavity 30b ... large diameter part 30c ... Small diameter part 30d ... Connection part 31 ... Type 32 ... Type 33 ... Mandrel 34 ... Shaping type 34a ... Arc surface EG ... Engine RG ... Radiator RV ... R Over bar

Claims (2)

[Claims] 1. A branch hose comprising a large-diameter hose and a small-diameter hose smaller in diameter than the large-diameter hose and branched from the large-diameter hose, wherein the small-diameter hose is formed on a side wall of the large-diameter hose. A branch port having an outer diameter substantially equal to the diameter of the hose, a large-diameter connection section formed around the branch port, and a small-diameter connection section formed so as to expand the end of the small-diameter hose. By inserting the small-diameter connection portion into the large-diameter hose through the branch port and vulcanizing the small-diameter connection portion in close contact with the large-diameter connection portion, and A branch hose in which a small diameter hose is connected so as to branch. 2. The large-diameter connection part according to claim 1,
The large-diameter hem portion is formed so as to hem and widen the periphery of the branch port, and the small-diameter connection portion is formed so as to hem and widen the end of the small-diameter hose, and the large-diameter hem portion is formed. A branch hose formed in a small-diameter hem-shaped portion that is in close contact with the hose.