JP4792313B2 - Method for manufacturing fluid transport resin hose - Google Patents

Description

This invention relates to a process for producing a fluid transport resin hose.

As a fluid transport hose, for example, a fuel transport hose that transports fuel injected from the fuel injection port of an automobile to a fuel tank, NBR + PVC that has been excellent in vibration absorption and assembly and has excellent fuel resistance (gasoline) permeability Common hoses such as (a blend of acrylonitrile butadiene rubber and polyvinyl chloride) have been used.
However, in recent years, the permeation regulation of automobile fuel has become stricter from the viewpoint of global environmental conservation, and it is expected that the demand for fuel permeation resistance will increase further in the future.
As a countermeasure for this, a resin hose comprising a resin excellent in permeation resistance to fuel as a constituent material has been developed and used.

Conventionally, when connecting such a resin hose to a mating pipe, a connection is made using a resin fitting called a so-called quick connector.
For example, Patent Document 1 below discloses a hose connection structure using this quick connector.
FIG. 9 specifically shows this. Here, a resin quick connector (joint) 202 is attached in advance to the end of the resin hose 200, and a metal mating pipe 204 is inserted therein. Thus, the resin hose 200 and the mating pipe 204 are connected to each other through the quick connector 202, and the O-ring 206 attached to the quick connector 202 is sealed between them.
However, in such a connection using the quick connector 202, the quick connector 202 is necessary as an extra part for connecting the hose, and the counterpart pipe 204 is also a dedicated part corresponding to this, and the required cost is reduced. In addition to the problem of becoming high, there is a possibility that the quick connector 202 may collide with other parts and be damaged when the automobile collides.

On the other hand, when the resin hose is directly connected to the mating pipe, the resin layer that is excellent in permeation resistance to transport fluids such as fuel is harder than rubber, so in the case of such a resin hose, it is fitted on the mating pipe. When it fits in, the contact with the mating pipe is poor, and the sealing performance becomes insufficient.
In addition, since the deformation resistance when the resin hose is fitted to the mating pipe in the external fitting state is large, a large force is required during the fitting operation, resulting in a problem that the workability of the hose is deteriorated.

A device for solving such a problem is disclosed in Patent Document 2 below.
In this Patent Document 2, an extension is provided at the end of the rubber outer tube disposed outside the resin inner tube, this is folded back inside, and the folded portion is overlapped inside the end of the resin inner tube, In order to prevent the folded portion from turning over when the hose is pulled out from the mating pipe, the folded portion is fitted to the outer circumference of the mating pipe. It is disclosed that the outer ring and the inner ring are sandwiched in the radial direction from the surface and the inner peripheral surface and fixed.

However, in the one disclosed in Patent Document 2, an extension is provided at the end of the rubber outer tube, and then folded back so as to overlap the inner surface of the resin inner tube, and further fixing by the outer ring and the inner ring is necessary. The process for manufacturing the hose or connecting to the mating pipe becomes complicated, resulting in an increase in cost.
There is also a problem that it cannot be applied to a hose that does not have a rubber outer tube.

  On the other hand, in Patent Document 3, in an automobile fuel hose, an unvulcanized seal rubber having a short cylindrical shape with respect to the hose body is fixed to the inner surface of the end portion of the hose body made of fluororesin by vulcanization adhesion. Fit the end of the hose to the mating pipe through the rubber seal, and tighten the outer surface of the rubber outer tube (protector) with the hose clamp (band) in the reduced diameter direction so that the hose is connected to the mating pipe. The point which it came to conclude is disclosed.

However, the one disclosed in Patent Document 3 requires a process in which a short cylindrical seal rubber is molded in an unvulcanized state, and this is set on the inner surface of the end portion of the resin hose body and vulcanized and bonded. Thus, the process for connecting the hose and the mating pipe is complicated, and the manufacturing cost is increased.
Further, in this Patent Document 3, since the hose clamp is tightened in the reduced diameter direction from the outside of the hose body made of a hard resin and is fastened to the mating pipe, the fastening force by the hose clamp is the same as that of the mating pipe. It is difficult to reach the seal rubber that is in direct contact, and as a result, there is a problem that the sealing performance may be insufficient.

  Although the fuel transport hose has been mainly described above as an example, such a problem is common to fluid transport resin hoses having a hose body made of resin.

JP-A-8-270875 Japanese Patent No. 3690053 Japanese Patent No. 3683006

The present invention is based on the above circumstances, and in a hose having a hose body made of resin as a constituent material and a connection end made of a rubber elastic body attached to the end, the connection end is used as the hose body. On the other hand, the resin hose can be easily manufactured with a small number of processes, and thus the resin hose can be manufactured at a low cost, and when the connection end is tightened to the other pipe by the hose clamp, the hose clamp has a good tightening force. It has been made for the purpose of providing an inner exerted up to the circumferential surface high sealability the method for manufacturing the fluid transport resin hose which can be secured.

Thus, in the first aspect of the present invention , the hose main body made of resin and the hose main body are attached to the end of the hose main body, fitted into the mating pipe in an external fitting state, and tightened in the diameter reducing direction by the hose clamp, has a configured connection end at concluded the rubber elastic body, the connection end, forms a short cylindrical non bent shape with respect to the hose body, an end portion of said hose body Is integrally molded by injection molding so that it is embedded at a depth that does not reach the fastening position by the hose clamp from the axial end surface to the inside of the cylindrical wall at the intermediate portion in the thickness direction of the cylindrical wall over a predetermined axial length. the method of manufacturing a hose body end fluid-transporting resin hose that is integrated with the portion Te, at setting the end of the hose body in a mold, embedding of the hose body in the connecting end join the club Inner peripheral side Injection molding, and subsequently injection molding the outer peripheral side portion of the embedded portion and simultaneously molding the distal end portion from the embedded portion of the connection end portion, and the outer peripheral side portion through the distal end side portion The molding die is integrated with the inner peripheral side portion, and the molding die is overlapped with the first split die in the central portion perpendicular to the axial direction of the hose and the outer surface perpendicular to the axis of the first split die. It has a two-part dividing type and a third part-dividing type that is the outer side of the second divided type in the direction perpendicular to the axis, and the second divided type can move backward in a direction away from the axial center side of the hose body. The inner surface of the second split mold in the direction perpendicular to the axis is provided with a concave portion that is recessed outward in the direction perpendicular to the axis, and the second split mold is moved forward by the recess at the first position. Forming a molding cavity of the inner peripheral part between the one-part die In addition, the second divided type and the third divided type are separated from the first divided type by the backward movement of the second divided type and the inward movement of the third divided type in the direction perpendicular to the axis. Forming the molding cavity of the tip side part including the molding cavity of the outer peripheral side part and the recess, and the embedding part in the molding cavity of the inner peripheral side part at the advanced position of the second split mold In the inserted state, a rubber material is injected into the inner peripheral side of the embedding portion of the molding cavity to inject the inner peripheral side portion, and then the second split mold is moved backward and the third By moving the split mold in the direction perpendicular to the axis, a molding cavity in the outer peripheral portion and a molding cavity in the distal end portion are generated, and a rubber material is injected into the outer peripheral side and the distal end side of the embedded portion, Outer peripheral part and the tip The side portion is simultaneously injection-molded and integrated with the inner peripheral side portion .

According to a second aspect of the present invention, in the first aspect, the end portion of the hose body is expanded in diameter, and the expanded diameter portion is embedded in the connection end portion .

Effects and effects of the invention

As described above, in the manufacturing method of the present invention , the end portion of the hose main body made of resin is formed from the axial end surface to the inside of the cylindrical wall at the intermediate portion in the thickness direction of the cylindrical wall over a predetermined axial length and by the hose clamp. In the state where it is embedded at a depth that does not reach the fastening position, the connection end of the rubber elastic body is integrally formed into a non-bent short tube by injection molding and integrated with the end of the hose body. is there.

According to the present invention, clamped by a hose clamp fitted in the state fitted on the mating pipe, the connection end portion of the rubber elastic body that is fastened, it is possible to easily molded by injection molding, its adult form At the same time, this can be integrated with the hose body made of resin at the same time, and fluid transport resin hoses with connecting ends can be easily manufactured with a small number of processes, reducing the manufacturing cost compared to conventional ones. be able to.
Moreover the connection end of that, to configure so as to surround the end portion of the hose body a resin as the material of the inner and outer circumferential sides, when connecting the fluid transport resin hose mating pipe, the rubber elastic body It is possible to ensure a high sealing performance by good adhesion of the connecting end portion to the mating pipe, and even when the fluid transport resin hose is fitted into the mating pipe in an externally fitted state, it is smaller in elastic deformation of the connecting end portion. This can be easily inserted by force. That is, the hose connection work can be easily performed.

In the present invention also the implantation depth of the connection end portion of the end portion of the hose body, to a depth not lead to the fastening position by a hose clamp, when tightened connection ends in a hose clamp, the The tightening force is transmitted well to the inner surface, and can be brought into a fastened state with the other pipe with a good tightening force.

In the manufacturing method of the present invention, with the end portion of the hose body set in a molding die, the inner peripheral side portion of the embedded portion of the hose body at the connection end portion is first injection molded, and then the outer peripheral side portion of the embedded portion. the by injection molding, integrated with an inner peripheral portion that is molded first.

For example, when the entire connection end including the inner and outer peripheral parts of the embedding part is injection-molded at once, with the end of the hose body set in the mold, the injection pressure sets it to the mold. The end portion of the hose body in a deformed state is deformed, and in particular, the injection material, that is, the rubber material does not enter the inner peripheral side of the embedded portion of the hose body, and it is difficult to perform the molding well.
Therefore, in the manufacturing method of the present invention , when the connecting end portion is injection-molded and integrated into the hose body at the same time, first, the inner peripheral side portion of the embedded portion of the hose main body is injection-molded, and then the outer peripheral side portion is injection-molded. and and integrate them.

Here, when the inner peripheral portion is injection molded, a molding cavity having a shape corresponding to the inner peripheral portion is formed in the molding die, and the end of the hose body, that is, the embedded portion is brought into contact with the molding surface of the molding die. In this state, the inner peripheral side portion can be injection-molded in a state where it is backed up by a molding die. Therefore, when the inner peripheral side portion is injection-molded, the end portion of the hose body, that is, the embedded portion is injected by the injection pressure. It is possible to effectively prevent the deformation.
That is, the inner peripheral side portion can be favorably injection molded without causing deformation due to the injection pressure in the embedded portion.

And after that, by forming a molding cavity of a shape corresponding to the outer peripheral side portion of the embedded portion in the molding die, and injection molding the outer peripheral side portion in that state, such an outer peripheral side portion can be molded well, Even in that case, it is possible to satisfactorily prevent deformation of the embedded portion of the hose body due to the injection pressure.
The reason for this is that deformation is prevented by such an embedded portion being backed up by the inner peripheral side portion by the previously performed injection molding of the inner peripheral side portion.

In this case, when the inner peripheral side portion of the embedded portion is injection-molded, the distal end portion is not molded from the embedded portion of the connecting end portion, and when the outer peripheral side portion of the embedded portion is injection-molded, the distal end portion the co-molded, and via its distal portion, you already integrating the inner peripheral portion and later injection molded outer peripheral portion of the injection molding.

In these cases, the present invention after injection molding the inner peripheral portion of said implanting part, by shifting the position of the mold, you injection molding the outer peripheral portion of the implanting part.
In this way, after the inner peripheral side portion is injection-molded, the outer peripheral side portion and the front end side portion from the embedded portion can be quickly injection-molded, and the inner peripheral side portion previously injected is vulcanized. Before the reaction takes place, the outer peripheral side portion and the distal end side portion that have been injection-molded later can be satisfactorily integrated with the inner peripheral side portion, and the entire connecting end portion can be vulcanized in this state.

In the present invention, the fluid transport resin hose can be manufactured so that the end portion of the hose body is expanded and the expanded portion is embedded in the connection end portion (Claim 2).
In this case, the thickness of the end portion of the hose body at the connection end portion, that is, the inner peripheral side portion of the embedded portion can be effectively increased, while ensuring a large internal channel cross-sectional area, The inner peripheral side portion can be connected to the mating pipe in a state where the inner peripheral side portion is sufficiently compressed and elastically deformed, and high sealing performance can also be ensured.
Furthermore, by making the inner peripheral side portion of the embedded portion at the connection end portion thicker in this way, when forming the connection end portion by injection molding, the rubber material that is the constituent material of the connection end portion is satisfactorily used. It is possible to wrap around to the inner peripheral side of the end portion, and to form the inner peripheral side portion into a good shape.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a fluid injection resin hose (hereinafter simply referred to as a hose) suitable for use as a fuel injection hose (filler hose) for transporting fuel injected from a fuel injection port to a fuel tank. Reference numeral 12 denotes a hose body entirely made of resin.
The hose body 12 has a bellows portion 14 and an end portion 16 having a straight shape in the hose axial direction.

Reference numeral 18 denotes a connection end attached to the end 16 of the hose body 12.
As shown in FIG. 2, the connecting end portion 18 has a short cylindrical shape (and a non-bent shape) with respect to the hose body 12, and the whole is constituted by a rubber elastic body. The connection end 18 is integrally vulcanized and bonded to the hose body 12.
The connection end 18 is a portion that is fitted into the metal mating pipe 20 in an external fitting state and connected to the mating pipe 20.
Specifically, the hose 10 is fitted into the mating pipe 20 at the connection end 18, and in this state, the hose 10 is tightened from the outer peripheral surface in the diameter reducing direction by the hose clamp 22 and fastened to the mating pipe 20.

Here, as the hose clamp 22, one provided with a tightening band 24 and a tightening mechanism 28 using a screw 26 is used.
When the screw 26 is tightened, the tightening band 24 contracts and the connection end 18 is tightened in the direction of diameter reduction from the outer peripheral surface, and the hose clamp 22 is fastened to the mating pipe 20 to prevent the hose clamp 22 from being pulled out.
Reference numeral 30 denotes a bulging portion (bulge portion) integrally formed in an annular shape so as to protrude from the outer peripheral surface of the mating pipe 20.

In the figure, 18-4 represents a tightening portion of the connection end portion 18 by the hose clamp 22.
The connecting end portion 18 is a position where the end portion 16 of the hose body 12 is tightened by a hose clamp 22, specifically from the axial end surface to the inside of the cylinder wall at a middle portion in the thickness direction of the cylinder wall over a predetermined axial length. Is integrally formed by injection molding so as to be embedded at a depth not reaching the tightening portion 18-4, and is integrated with the end portion 16 of the hose body 12 by the injection molding.
In the drawing, 16-1 represents a portion embedded in the connection end 18 at the end 16 of the hose body 12.
Reference numeral 18-1 denotes an inner peripheral side portion of the embedded portion 16-1 at the connecting end portion 18, 18-2 denotes an outer peripheral side portion of the embedded portion 16-1, and 18-3 denotes a portion more than the embedded portion 16-1. The tip side part is shown.
The tightening portion 18-4 is formed on the tip end portion 18-3.

The hose 10 shown in FIG. 2 can be manufactured as follows. 3 and 4 schematically show the manufacturing method.
In this manufacturing method, first, a resin hose body 12 is molded, and its end 16 is set on a molding die 32 (see FIG. 3I).
Here, the mold 32 includes a first split mold 34, a second split mold 36, and a third split mold 38.
In the step shown in FIG. 3I, first, the end portion 16 of the hose body 12 is set in an insertion state in a molding cavity 40 formed between the first split mold 34 and the second split mold 36.

In this state, as shown in FIG. 3 (II), a rubber material, which is a constituent material of the connection end 18, is injected into the molding cavity 40 to inject the inner peripheral side portion 18-1 at the connection end 18. Mold.
At this time, the injection pressure acts on the end portion 16 in the hose body 12, specifically, the embedded portion 16-1, but the embedded portion 16-1 is in contact with the molding surface 42 of the second split mold 36 and is molded. Since it is backed up by the surface 42, the embedded portion 16-1 is not particularly deformed by the injection pressure.

Subsequently, the second split mold 36 is slid to the left in the figure, and the third split mold 38 is moved downward in the figure, and as shown in FIG. A mold cavity 44 is formed between the split mold 36 and the third split mold 38.
In this state, the rubber material is again injected into the molding cavity 44, whereby the outer peripheral side portion 18-2 and the distal end side portion 18-3 of the connection end 18 are injection-molded (see FIG. 4 (IV)).

The injection molding of the outer peripheral side portion 18-2 and the distal end side portion 18-3 is quickly performed before the inner peripheral side portion 18-1 previously molded by injection molding undergoes a vulcanization reaction.
Therefore, the injection molded outer peripheral side portion 18-2 and the distal end side portion 18-3 are united with the inner peripheral side portion 18-1 at the same time as being injected, and the vulcanization reaction proceeds in this state. Thus, the entire connection end 18 is vulcanized.
At the same time, the connecting end portion 18 is integrated with the end portion 16 of the hose body 12, specifically, the embedded portion 16-1 by vulcanization adhesion.

Thereafter, the mold 32 is opened as shown in FIG. 4 (V), and the connecting end 18 is taken out of the mold 32 together with the hose body 12.
Here, the hose 10 shown in FIG. 2 is obtained.

According to the present embodiment as described above, the connecting end 18 can be easily formed, and at the same time as the forming, the connecting end 18 can be integrated with the hose body 12, and the connecting end 18 can be easily provided with a small number of steps. The hose 10 can be manufactured, and the manufacturing cost can be reduced compared to the conventional case.
In addition, since the resin end portion 18 is configured to wrap the end portion 16 of the hose body 12 made of resin from the inner peripheral side and the outer peripheral side, the hose 10 is connected to the mating pipe 20 as shown in FIG. When connecting, it is possible to ensure high sealing performance by good contact of the connecting end 18 made of a rubber elastic body to the mating pipe 20, and when the hose 10 is fitted into the mating pipe 20 in an externally fitted state. In this case, the elastic deformation of the connecting end 18 can be easily fitted with a smaller force. That is, the hose connection work can be easily performed.

  Moreover, in this embodiment, since the embedding depth of the end portion 16 in the hose body 12 in the connection end portion 18 is set to a depth that does not reach the tightening portion 18-4 that is the fastening position by the hose clamp 22. When the connection end 18 is tightened by the hose clamp 22, the tightening force is transmitted to the inner surface well, and the mating pipe 20 can be fastened with a good tightening force.

In this embodiment, with the end 16 of the hose body 12 set in the mold 32, the inner peripheral portion 18-1 of the connection end 18 is first injection-molded, and then the outer peripheral portion 18-2 is injected. The embedded portion 16-1 is integrated with the previously molded inner peripheral portion 18-1, but the embedded portion 16A is set with the end portion 16A of the hose body 12A set in the forming die 32 as shown in FIG. When the entire connecting end 18A including the inner peripheral portion 18-1A, the outer peripheral portion 18-2A, and the tip end portion 18-3A of the -1A is injection-molded at once, the injection pressure causes the molding die 32 to The end portion 16A of the hose body 12A in the set state is deformed, and in particular, the injection material, that is, the rubber material does not enter the inner peripheral side of the embedded portion 16-1A of the hose body 12A, and the molding cannot be performed satisfactorily. .
However, according to the present embodiment, the connection end portion 18 including the inner peripheral side portion 18-1, further including the outer peripheral side portion 18-2 and the distal end side portion 18-3 can be satisfactorily formed without causing such a problem. and it is possible and monitor can be held end of the hose body 12, i.e. implanting part 16-1 in good shape.

FIG. 6 shows another embodiment of the present invention.
In this example, an enlarged diameter portion 46 is provided at the end portion 16 of the hose body 12, and the connection end portion 18 is integrally formed by injection molding in a state in which the enlarged diameter portion 46 is embedded in the hose body 12. It is an integrated one.

7 and 8 schematically show the manufacturing method in this case.
In this manufacturing method, the mold 32 includes a first split mold 34, a second split mold 48, and a third split mold 50.
In this manufacturing method, as shown in FIG. 7 (I), a state in which the enlarged diameter portion 46 of the hose body 12 is inserted into the molding cavity 40 formed by the first split mold 34 and the second split mold 48. In this state, a rubber material is injected into the molding cavity 40, and the inner peripheral side portion 18-1 at the connection end 18 is injection molded. FIG. 7 (II) shows the state at this time.

Next, as shown in FIG. 8 (III), the second split mold 48 is slid to the left in the figure, and the third split mold 50 is moved downward, thereby forming the molding cavity 52.
In this state, the rubber material is injected into the molding cavity 52, the outer peripheral side portion 18-2 and the tip end side portion 18-3 are simultaneously injection molded, and these are integrally fused with the inner peripheral side portion 18-1. Then, the vulcanization reaction is advanced to vulcanize and form the connection end 18 and to integrate it with the hose body 12 (see FIG. 8 (IV)).

Thereafter, as shown in FIG. 8 (V), the molding die 32 is opened, the vulcanization molding is performed, and the connection end 18 integrated with the hose body 12 is removed from the molding die 32 together with the end 16 of the hose body 12. Take out.
Here, the hose 10 shown in FIG. 6 is obtained.

In this embodiment, since the hose 10 is configured so that the end portion 16 of the hose body 12 is expanded in diameter and the expanded diameter portion 46 is embedded in the connection end portion 18, the hose at the connection end portion 18. The thickness of the inner peripheral side portion 18-1 of the end portion 16 of the main body 12 can be effectively increased, and the inner peripheral side portion 18-1 can be sufficiently secured while ensuring a large internal channel cross-sectional area. The hose 10 can be connected to the mating pipe 20 in a state in which it is compressed and elastically deformed, and high sealing performance can also be ensured.
Furthermore, by making the inner peripheral side portion 18-1 of the connection end 18 thick as described above, when the connection end 18 is molded by molding, a rubber material that is a constituent material of the connection end 18 is excellent. The inner portion 18-1 can be formed into a good shape by wrapping around the embedded portion 16-1 of the hose body 12.

  Although the embodiments of the present invention have been described in detail above, these are merely examples, and the present invention can be configured and implemented in various forms and modes without departing from the spirit of the present invention.

It is a figure which shows the fluid transport resin hose obtained with the manufacturing method of one Embodiment of this invention. It is a principal part expanded sectional view of FIG. It is process drawing which shows the manufacturing method of the hose of FIG. FIG. 4 is a process diagram following FIG. 3. It is a comparative example figure. It is the figure which showed the hose of the form different from what is shown in FIG. It is process drawing which shows the manufacturing method of the hose of FIG. FIG. 8 is a process diagram following FIG. 7. It is a figure which shows the connection method of the conventional fluid transport hose.

DESCRIPTION OF SYMBOLS 10 Fluid transport resin hose 12 Hose body 16 End part 16-1 Embedding part 18 Connection end part 18-1 Inner side part 18-2 Outer side part 18-3 End side part 18-4 Fastening part 20 Counterpart pipe 22 Hose Clamp 32 Mold 34 First split mold 36, 48 Second split mold 38, 50 Third split mold 46 Diameter expansion part

Claims (2)

Consists of a hose body made of resin, and a rubber elastic body that is attached to the end of the hose body, fitted in a mating pipe in an external fitting state, tightened in the direction of diameter reduction by a hose clamp, and fastened. Connecting end and
The connecting end portion has a short tube shape that is not bent with respect to the hose body, and the end portion of the hose body extends from the axial end surface at an intermediate portion in the thickness direction of the cylinder wall over a predetermined axial length. the interior walls, and the production method of the fluid-transporting resin hose that is integrated with the end portion of the hose body are integrally molded by injection molding in a state causes embedded in Itala not depth to engagement position by a hose clamp There,
With the end portion of the hose body set in a molding die, the inner peripheral side portion of the embedded portion of the hose body at the connection end portion is injection molded, and then the outer peripheral side portion of the embedded portion is injection molded. The front end side portion is simultaneously formed from the embedded portion of the connection end portion, and the outer peripheral side portion is integrated with the inner peripheral side portion via the front end side portion,
The mold includes a first split mold in the center perpendicular to the axial direction of the hose, a second split mold that overlaps the axially perpendicular outer surface of the first split mold, and the second split mold. A third split mold on the outer side perpendicular to the axis,
The second split mold is movable backward in a direction away from the axial center of the hose body;
The inner surface of the second split mold in the direction perpendicular to the axis is provided with a recess having a shape recessed outward in the direction perpendicular to the axis, and the second split mold is moved forward from the first split mold by the recess. It is supposed to form a molding cavity in the inner peripheral part in between,
The second divided type and the third divided type have the outer peripheral side portion between the first divided type and the first divided type by the backward movement of the second divided type and the inward movement of the third divided type in the direction perpendicular to the axis. Forming the molding cavity of the tip side portion including the molding cavity and the recess,
The rubber material is injected into the inner peripheral side of the embedding portion of the molding cavity in a state where the embedding portion is inserted into the molding cavity of the inner peripheral side portion at the advance position of the second split mold. After injection molding the peripheral part,
The retraction movement of the second split mold and the inward movement of the third split mold in the direction perpendicular to the axis give rise to a molding cavity in the outer peripheral side part and a molding cavity in the front end side part,
Injecting a rubber material to the outer peripheral side and the front end side of the embedding part, simultaneously injecting and molding the outer peripheral side part and the front end side part, and integrating with the inner peripheral side part Manufacturing method of resin hose. 2. The method of manufacturing a fluid transport resin hose according to claim 1, wherein an end portion of the hose body is expanded in diameter, and the expanded diameter portion is embedded in the connection end portion.

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